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MINISTRY OF
INDUSTRY AND TRADE
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SOCIALIST REPUBLIC
OF VIETNAM
Independence -
Freedom - Happiness
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No. 39/2022/TT-BCT
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Hanoi, December 30,
2022
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CIRCULAR
AMENDMENTS
AND SUPPLEMENTS TO CIRCULAR NO. 25/2016/TT-BCT DATED NOVEMBER 30, 2016 OF
MINISTER OF INDUSTRY AND TRADE ON ELECTRICITY TRANSMISSION SYSTEM; CIRCULAR NO.
39/2015/TT-BCT DATED NOVEMBER 18, 2015 OF MINISTER OF INDUSTRY AND TRADE ON
ELECTRICITY DISTRIBUTION SYSTEM; CIRCULAR NO. 30/2019/TT-BCT DATED NOVEMBER 18,
2019 ON AMENDMENTS AND SUPPLEMENTS TO SEVERAL ARTICLES OF CIRCULAR NO.
25/2016/TT-BCT DATED NOVEMBER 30, 2016 OF MINISTER OF INDUSTRY AND TRADE ON
ELECTRICITY TRANSMISSION SYSTEM, AND CIRCULAR NO. 39/2015/TT-BCT DATED NOVEMBER
18, 2015 OF MINISTER OF INDUSTRY AND TRADE ON ELECTRICITY DISTRIBUTION SYSTEM
Pursuant to the Law on Electricity dated
December 3, 2004; the Law on amendments and supplements to certain Articles of
the Law on Electricity dated November 20, 2012, and the Law on Amendments and
Supplements to several Articles of the Law on Public Investment, the Law on
Public-Private Partnership Investment, the Law on Investment, the Law on
Housing, the Law on Bidding, the Law on Electricity, the Law on Enterprises,
the Law on Special Excise Duties and the Law on Civil Judgment Enforcement, in
force as from January 11, 2022;
Pursuant to the Government's Decree No.
96/2022/ND-CP dated November 29, 2022, defining the functions, tasks, powers
and organizational structure of the Ministry of Industry and Trade;
Pursuant to the Government’s Decree No.
137/2013/ND-CP dated October 21, 2013 elaborating on the implementation of
certain articles of the Law on Electricity and the Law on Amendments and
Supplements to certain Articles of the Law on Electricity;
Upon the request of the Director of the Electricity
Regulatory Authority;
The Minister of Industry and Trade herein
promulgates the Circular on amendments and supplements to the Circular No.
25/2016/TT-BCT dated November 30, 2016 of the Minister of Industry and Trade on
electricity transmission system; the Circular No. 39/2015/TT-BCT dated November
18, 2015 of the Minister of Industry and Trade on electricity distribution
system; the Circular No. 30/2019/TT-BCT dated November 18, 2019 on amendments
and supplements to several Articles of the Circular No. 25/2016/TT-BCT dated
November 30, 2016 of the Minister of Industry and Trade on electricity
transmission system, and the Circular No. 39/2015/TT-BCT dated November 18,
2015 of the Minister of Industry and Trade on electricity distribution system.
Article 1. Amendments
and supplements to several Articles of the Circular No. 30/2019/TT-BCT dated
November 18, 2019 on amendments and supplements to several Articles of the
Circular No. 25/2016/TT-BCT dated November 30, 2016 of the Minister of Industry
and Trade on electricity transmission system, and the Circular No.
39/2015/TT-BCT dated November 18, 2015 of the Minister of Industry and Trade on
electricity distribution system
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“7. Amending and
supplementing clause 1 of Article 31 as follows:
1. The customer having
access to the transmission grid shall be responsible for investing in,
installing and managing operation of the information system under their
delegated authority, and ensuring it is connected to the information system
under the control of the power transmission unit and the Dispatch Division given
control (hereinafter referred to as authorized Dispatch Division); ensuring
that data (including those of SCADA, PMU and fault recorder) are communicated
and transmitted in a full, reliable and continuous manner for the purposes of normal
operation of the electrical power system and market. The indispensable means of
communication serving dispatching and operation activities in an electricity
transmission system shall include direct communication channel, telephone, DIM
and computer network.”.
2. Amending clause 10
of Article 1 as follows:
“10. Amending clause
2 of Article 37 as follows:
2. Connection
requirements of the Control Center
a) Requirements for
connection to the communications system
- Get a data
transmission line connected to a communication system of the authorized
Dispatch Division. Where there are multiple authorized Dispatch Divisions, all
of them shall be responsible for agreeing on the data-sharing method;
- Connect two data
transmission lines (including an active line and a standby line) to the control
and information system of the power plant or station remotely controlled by the
Control Center;
- The indispensable means
of communication intended for dispatch between the authorized Dispatch Divisions
and the Control Center shall comprise direct communication channel, telephone, DIM
and computer network. The indispensable means of communication between the
Control Center and power plants or stations shall comprise direct communication
channel, telephone, and computer network.
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- Make a connection
to the SCADA system of the authorized Dispatch Division. Where there are
multiple authorized Dispatch Divisions, all of them shall be responsible for sharing
data;
- Make two
connections to such terminal device as RTU or Gateway, the control system of the
power plant or station, and to the switchgear on the electrical grid remotely controlled
by the Control Center.
c) The Control Center
must install monitoring screens connected to closed-circuit television cameras
at power plants or stations.”.
3. Amending clause 11
of Article 1 as follows:
“11. Amending clause
3 of Article 38 as follows:
3. The generating set
at a power plant must be capable of playing its role in controlling the primary
frequency which falls outside of the dead band of the governor; of meeting at
least 50% of its primary frequency control capacity within the first 15 seconds,
and 100% of that within 30 seconds, as well as maintaining such level of
capacity for at least 15 following seconds. The primary frequency control
capacity of a generating set shall be calculated according to the actual
frequency deviation, its remaining available capacity, the primary response
limit varying depending on its technology, and the installed parameters
required by the Power System and Market Operator.".
4. Amending clause 12
of Article 1 as follows:
“12. Amending
Article 42 as follows:
Article 42. Technical
requirements of wind and solar power plants
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a) Free generation
mode: Generating the highest possible power shall depend on transformation of
the primary energy source (e.g. wind or solar energy);
b) Generation
capacity control mode:
Wind and solar power
plants must be capable of restricting the generation capacity according to a
dispatch instruction in the following cases:
- If the primary
energy source varies to the degree lower than the limit according to the
dispatch instruction, generating the highest possible power shall be required;
- If the primary
energy source varies to the degree equal to or greater than the limit according
to the dispatch instruction, generating the power equaling the limit according
to the dispatch instruction with the tolerance falling within the ± 01% band of
the rated capacity shall be required.
2. Wind and solar
power plants which are, at any time, getting connected to electrical grids must
have capacity to maintain generation of power for a minimum period of time corresponding
to the respective power-generating frequency band shown in Table 8 below:
Table
8
Required
minimum time length for maintenance of power generation at a wind or solar
power plant corresponding to the respective frequency band of the power system
Frequency
band
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From 47.5 Hz to
48.0 Hz
10
minutes
From greater than
48 Hz to less than 49 Hz
30
minutes
From 49 Hz to 51 Hz
Continuous
generation
From greater than
51 Hz to 51.5 Hz
30
minutes
From greater than
51,5 Hz to 52 Hz
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3. When the power
system’s frequency is greater than 50.5 Hz, wind and solar power plants may
reduce active power according to the comparative slope of the droop
characteristics line within the steep gradient range of between 2% and 10%. The
set value of the comparative slope of the droop characteristics line is
calculated and determined by the authorized Dispatch Division. The process of reduction
in active power shall be recorded from the start no later than 02 seconds after
recording the frequency of more than 50.5 Hz and shall be completed within 15
seconds.
4. Wind and solar
power plants must be capable of adjusting reactive power according to
characteristics shown in the following diagram and described in point a and b
of this clause:
a) If a power plant
produces active power greater than or equal to 20% of the rated active power,
and voltage at the high voltage side of the step-up transformer at the power
plant within the nominal band of ± 10%, it shall be capable of adjusting
reactive power continuously within the power factor range from 0.95 (in the
reactive power producing mode) to 0.95 (in the reactive power receiving mode) on
the high voltage side of the step-up transformer at the power plant, or at the
point of separating measurement of the reactive power of each plant when there
are many plants all connected to a step-up transformer corresponding to the
rated capacity;
b) If a power plant
generates the active power less than 20% of the rated power, it may reduce
ability to receive or generate the reactive power, depending on its
characteristics.
5. Voltage and
reactive power control mode:
a) Wind and solar
power plants must be capable of controlling voltage and reactive power:
- in the voltage
control mode used according to the set voltage value or the voltage-adjusting
droop characteristics (the characteristics of the relation between voltage and
reactive power);
- in the control mode
used according to the set value of reactive power;
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b) If voltage at the high
voltage side of the step-up transformer at a power plant falls within the band
of ± 10 % of the nominal voltage, wind or solar power plants must be capable of
adjusting voltage at the low pressure side of the step-up transformer with the
deviation no more than ± 0,5 % of the rated voltage (compared to the set
voltage value) whenever the reactive power produced by a generating set remains
within the permissible working band, and completing such adjustment within 05
seconds.
6. A wind and solar
power plant which is, at any time, obtaining grid connection must be capable of
maintaining its power generation corresponding to the respective voltage band
at the high voltage side of its step-up transformer within the following time
frames:
a) If voltage is less
than 0.3 pu, the minimum maintenance time will be 0.15 second;
b) If voltage ranges
from 0.3 pu to under 0.9 pu, the minimum maintenance time shall be calculated
according to the following formula:
Tmin = 4 x U – 0.6
Where:
- Tmin (second):
Minimum time required for maintenance of power generation;
- U (pu): Actual
voltage at the high voltage side of the plant’s step-up transformer expressed
in pu (per-unit);
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d) If voltage ranges
from 1.1 pu to under 1.15 pu, the wind and solar power plant must maintain the
power generation within 03 seconds;
dd) If voltage ranges
from 1.15 pu to under 1.2 pu, the wind and solar power plant must maintain
power generation within 0.5 second.
7. The level of phase
imbalance, total harmonic distortion and voltage flicker caused by wind or
solar power plants at the high voltage side of its step-up transformer shall
not be allowed to exceed any of the values specified in Article 7, 8 and 9
herein.
8. A wind or solar
power plant must invest in controlling and automatic equipment and systems to
ensure stable, reliable and secure connection to the Automatic Generation
Control (AGC) of the Electricity System and Market Operator to enable the remote
control of its power generation capacity according to the dispatch instruction
received from the Electricity System and Market Operator.
9. A wind or solar
power plant shall maintain its grid connection when the frequency fluctuation
rate in the power system which is measured within the time frame of 500
milliseconds falls within the range from 0 Hz/second to 01 Hz/second.
10. When voltage at
the high voltage side of the step-up transformer of a power plant falls outside
the band of ± 10 % of the rated voltage, the power plant must be capable of
setting the priority mode of generation of reactive current (when the voltage
is low), or absorption of reactive current (when voltage is high) to sustain
the power system during breakdown, in which case the reactive current can vary
from 0% to 10% of the power plant's rated current for every 1 % voltage change
with the permissible maximum tolerance of 20 % (the rate of change is
determined by the authorized Dispatch Division), and response time is not later
than 100 milliseconds.
11. After such
breakdown is successfully handled and the power system returns to the normal
operating mode, a power plant must ensure:
a) it is capable of
restoring the active power to return to the operating mode existing before the breakdown
occurs with the rate of increase in the active power not less than 30% of the
rated capacity per second, and not more than 200% of the rated power per second;
b) When sets of wind
turbines or inverters of a solar power plant are shut down in case of the power
system breakdown that lasts longer than the minimum required time of grid
connection, these sets shall be reconnected to the power system not earlier
than 03 minutes after the power system returns to normal operation at the rate
of recovery of active power which is not greater than 10% of the rated power
per minute.
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5. Amending clause 17
of Article 1 as follows:
“17. Amending
Article 73 as follows:
Article 73. Technical
requirements of ancillary services
1. Secondary
frequency control: The generating set or power plant providing the secondary
frequency control service must be capable of starting to provide frequency
control power within 20 seconds after receiving AGC signals from the Power
System and Market Operator; completely providing the registered secondary
frequency control power within 10 minutes, and maintaining this power level
within at least 15 minutes.
2. Quick start: The
generating set or power plant providing quick-start reserve must be capable of
increasing to the rated power within 25 minutes and maintaining it for a
minimum of 08 hours.
3. Voltage
adjustment: The generating set or power plant providing the voltage adjustment
service must be capable of changing the reactive power outside the adjustment
band prescribed in clause 2 of Article 38 and clause 4 of Article 42 herein,
meeting the requirements imposed by the Power System and Market Operator.
4. Must-run operation
reserves for power system security purposes: The generating set or power plant
providing the must-run operation service for electricity system security
purposes must be capable of increasing to the rated power within 1 hour and
maintaining such rated power for a minimum of 8 hours (excluding the start time).
5. Black start: The
generating set or power plant providing the black start service must be capable
of automatic cold start without needing any power supply from the national
electricity system; connecting and supplying power to the power system after
successful start.”.
6. Amending clause 18
of Article 1 as follows:
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Article 74:
Determination of demands and provision of ancillary services
1. General rules for
determining demands for ancillary services, including:
a) Maintain the
electrical power and capacity reserve level of the power system in order to
meet power system operation and security standards;
b) Incur minimum
expenses according to conditions and binding arrangements in the national
electricity system.
2. The Power System
and Market Operator, and the Vietnam Electricity Corporation shall be
responsible for calculating demands for ancillary services for the national
electricity system and seeking approval from the Vietnam Electricity
Corporation according to the Procedures for determination of demands and provision
of ancillary services issued by the Electricity Regulatory Authority.”.
7. Amending clause 10
of Article 2 as follows:
“10. Amending clause
1 and 2 of Article 38 as follows:
1. The power plant
connected to the distribution grid with the generation capacity of at least 10
MW (irrespective of any connection voltage level) and transformer substations
of 110 kV not yet connected to the Control Center are required to be equipped
with a Gateway or RTU, and establish two connections physically independent of
the SCADA system of the authorized Dispatch Division. If power plants or
transformer substations are under the control of multiple authorized Dispatch
Divisions, these Dispatch Divisions shall be responsible for sharing
information necessary for coordination in operation of the power system.
2. If the power plant
connected to the distribution grid with the generation capacity of at least 10
MW has already connected to the Control Center, it must be equipped with a
Gateway or RTU having one connection to the SCADA system of the authorized
Dispatch Division, and two connections to the control system at the Control
Center. Transformers of 110 kV that are controlled and operated remotely by the
Control Center are required to be furnished with a Gateway or RTU making two
connections to the control system at the Control Center and sharing information
from the Control Center to the authorized Dispatch Division.”.
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“11. Amending and
supplementing Article 40 as follows:
Article 40. Requirements
of wind power plants and solar power plants with greater than 1MW generation
capacity connected to the distribution grid at the medium-voltage or higher
level
1. Wind and solar
power plants must be capable of maintaining generation of active power in the
following modes:
a) Free generation
mode: Generating the highest possible power may depend on transformation of the
primary energy source (e.g. wind or solar energy);
b) Generation
capacity control mode:
Wind and solar power plants
must be capable of restricting the generation capacity according to a dispatch
instruction in the following cases:
- If the primary
energy source varies to the degree lower than the limit according to the
dispatch instruction, generation of the highest possible power shall be
required;
- If the primary
energy source varies to the degree equal to or greater than the limit according
to the dispatch instruction, generating the power equaling the limit according
to the dispatch instruction with the tolerance falling within the ± 01% band of
the rated capacity shall be required.
2. Wind and solar
power plants which are, at any time, getting connected to electrical grids must
have capacity to maintain generation of power for a minimum period of time
corresponding to the respective power-generating frequency band shown in Table
5b below:
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Required
minimum time length for maintenance of power generation of a wind or solar
power plant corresponding to the respective frequency band of the power system
Frequency
band
Required
minimum time length
From 47.5 Hz to
48.0 Hz
10
minutes
From greater than
48 Hz to less than 49 Hz
30
minutes
From 49 Hz to 51 Hz
Continuous
generation
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30
minutes
From greater than
51,5 Hz to 52 Hz
01
minute
3. When the power
system’s frequency is greater than 50.5 Hz, a wind and solar power plant may
reduce active power according to the comparative slope of the droop
characteristics line within the steep gradient range of between 02% and 10%. The
set value of the comparative slope of the droop characteristics line is
calculated and determined by the authorized Dispatch Division. The process of
reduction in active power shall be recorded from the start no later than 02
seconds after recording the frequency of more than 50.5 Hz and shall be
completed within 15 seconds.
4. A wind or solar
power plant must be capable of adjusting reactive power according to the
characteristics shown in the following diagram and described in point a and b
of this clause:
a) If the power plant
produces the active power greater than or equal to 20% of the rated active
power, and voltage on the high voltage side of its step-up transformer falling
within the nominal band of ± 10%, it shall be capable of adjusting reactive
power continuously within the power factor range from 0.95 (in the reactive
power producing mode) to 0.95 (in the reactive power receiving mode) at the
high voltage side of the step-up transformer at the power plant, or at the
point of separating measurement of the reactive power of each plant when there
are many plants all connected to a step-up transformer corresponding to the
rated capacity;
b) If the power plant
generates the active power less than 20% of the rated power, it may reduce its
capability to receive or generate the reactive power, depending on its
characteristics.
5. Voltage and
reactive power control mode:
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- in the voltage
control mode used according to the set voltage value or the voltage-adjusting
droop characteristics (the characteristics of the relation between voltage and
reactive power);
- in the control mode
used according to the set value of reactive power;
- in the control mode
used according to power factors;
b) If voltage at the
high pressure side of the step-up transformer at a power plant falls within the
band of ± 10 % of the nominal voltage, wind or solar power plants must be
capable of adjusting voltage at the low pressure side of the step-up
transformer with the deviation no more than ± 0,5 % of the rated voltage
(compared to the set voltage value) whenever the reactive power produced by a
generating set remains within the permissible working band, and completing such
adjustment within 05 seconds.
6. A wind and solar
power plant which is, at any time, obtaining grid connection must be capable of
maintaining its power generation corresponding to the voltage band at the high
pressure side of its step-up transformer within the following time frames:
a) If voltage is less
than 0.3 pu, the minimum maintenance time will be 0.15 second;
b) If voltage ranges
from 0.3 pu to under 0.9 pu, the minimum maintenance time shall be calculated
according to the following formula:
Tmin = 4 x U – 0.6
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- Tmin (second):
Minimum time required for maintenance of power generation;
- U (pu): Actual
voltage at the high pressure side of the plant’s step-up transformer expressed
in pu (per-unit);
c) If voltage ranges
from 0.9 pu to under 1.1 pu, the wind and solar power plant shall be required
to maintain continuous power generation;
d) If voltage ranges
from 1.1 pu to under 1.15 pu, the wind and solar power plant must maintain the
power generation within 03 seconds;
dd) If voltage ranges
from 1.15 pu to under 1.2 pu, the wind and solar power plant must maintain
power generation within 0.5 second.
7. The level of phase
imbalance, total harmonic distortion and voltage flicker caused by wind or
solar power plants at the high pressure side of its step-up transformer shall
not be allowed to exceed any of the values specified in Article 6, 7 and 8
herein.
8. A wind or solar
power plants must invest in its controlling and automatic equipment and systems
to ensure stable, reliable and secure connections to the Automatic Generation
Control (AGC) of an authorized Dispatch Division to enable the remote control
of its power generation capacity according to the dispatch instruction received
from the authorized Dispatch Division.
9. A wind or solar
power plant shall maintain its grid connection when the frequency fluctuation
rate in the power system which is measured within the time frame of 500
milliseconds falls within the range from 0 Hz/second to 01 Hz/second.
10. When voltage at
the high voltage side of the step-up transformer of a power plant falls outside
the band of ± 10 % of the rated voltage, the power plant must be capable of prioritizing
generation of reactive current (when the voltage is low), or absorption of
reactive current (when voltage is high) to sustain the power system during
breakdown, in which case the reactive current can vary from 0% to 10% of the
power plant's rated current for every 1 % voltage change with the permissible
maximum tolerance of 20 % (the rate of change is determined by the authorized Dispatch
Division), and response time is not later than 100 milliseconds.
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a) it is capable of
restoring the active power to return to the operating mode existing before the
breakdown occurs with the rate of increase in the active power not less than
30% of the rated capacity per second, and not more than 200% of the rated power
per second;
b) When sets of wind
turbines or inverters of a solar power plant are shut down in case of the power
system breakdown that lasts longer than the minimum required time of grid
connection, these sets shall be reconnected to the power system not earlier
than 03 minutes after the power system returns to normal operation at the rate
of recovery of active power which is not greater than 10% of the rated power
per minute.
12. A power plant is
required to maintain grid connection when the voltage at the high voltage side
of its step-up transformer happens to make an instantaneous phase swing of up
to 20 degrees within 100 milliseconds without causing any power generation
interruption or reduction.”.
9. Amending clause 13
of Article 2 as follows:
“13. Amending clause
2 of Article 42 as follows:
2. Connection
requirements of the Control Center
a) Requirements for
connection to communications systems:
- Get a data
transmission line connected to a communication system of the authorized
Dispatch Division. Where there are multiple authorized Dispatch Divisions,
all of them shall be responsible for agreeing on the data-sharing method;
- Connect two data
transmission lines (including an active line and a standby line) to the control
and information system of the power plant or station remotely controlled by the
Control Center;
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b) Requirements for
connection to the SCADA system:
- Make a connection
to the SCADA system of the authorized Dispatch Division. Where there are
multiple authorized Dispatch Divisions, all of them shall be responsible for
sharing data;
- Make two
connections to such terminal device as RTU or Gateway, the control system of
the power plant or station, and to the switchgear on the electrical grid
remotely controlled by the Control Center.
c) The Control Center
must install monitoring screens connected to closed-circuit television cameras
at the power plant or station.”.
Article 2. Amendments
and supplements to several Articles of the Circular No. 25/2016/TT-BCT dated
November 30, 2016 of the Minister of Industry and Trade on the electricity
transmission system
1. Amending and
supplementing clause 16 of Article 3 as follows:
“16. Power
transmission unit refers to an electricity entity that obtains the license for transmission
of electricity.”.
2. Adding point d to
clause 1 of Article 37 as follows:
“d) Total rated
capacity of power plants under the Control Center shall not exceed the rated
capacity of the largest generating set in operation in the national power
system as determined by the Power System and Market Operator.”.
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“1. The wind or
solar power plant having the installed capacity of greater than 30MW shall be
required to invest in the control and automatic equipment and system to ensure
stable, reliable and secure connection to Automatic Generation Control (AGC) of
the Power System and Market Operator for the remote control of generation of the
generating set according to the dispatch instruction received from the Power
System and Market Operator. For power plants within an industrial zone that
only sell part of their generated power to the national power system, the
necessity of furnishing an AGC system is agreed upon and clearly stated in a
Connection Agreement by the parties. Specific technical requirements concerning
connection of the AGC signal of the generating set to SCADA/EMS of the Power
System and Market Operator are specified in the Regulations on technical and operational
requirements of SCADA brought into force by the Electricity Regulatory
Authority.”.
4. Supplementing
clause 8 of Article 38 as follows:
“8. The generating
set of a power plant shall maintain its grid connection when the frequency
fluctuation rate in the power system which is measured within the time frame of
500 milliseconds falls within the range from 0 Hz/second to 01 Hz/second.”.
5. The title of
Article 46 shall be revised as follows:
“Article 46. Provision
of documentation required for checking whether power is on at connection points
for test run and acceptance testing purposes”.
6. Amending and
supplementing the first hyphen bullet of point c of clause 1 of Article 46 as
follows:
“- Technical specifications
of installed equipment include technical specifications of connected lines;”.
7. The title of
Article 47 shall be revised as follows:
“Article 47. Checking
whether power is on at connection points for test run and acceptance testing
purposes”.
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“2. Power
transmission unit shall be responsible for agreeing with the customers who wish
to get connected on the process of checking the submitted documents, the report
of acceptance test and the actual status of installation of equipment as per
the Connection Agreement.”.
9. The title of
Article 48 shall be revised as follows:
“Article 48. Power-on
status at connection points for test run and acceptance testing purposes”.
10. Amending and supplementing
point a of clause 1 of Article 48 as follows:
“a) Legal and
technical dossier of a construction project:
- Written
confirmation and commitment of the customer wishing to obtain power connection,
stating that equipment within the power-on range has been tested and checked to
meet the operational and technical requirements agreed at the connection points
and fully comply with the law;
- Copy of the Report
of inspection of power-on status at the connection points, stating that it has
fully met the requirements set forth in the Connection Agreement;
- The metering system
that has been completed in accordance with regulations, and in which indicators
of delivery and receipt of electricity shown by meters installed have been cut
off;
- The Power Purchase
Agreement signed, or the agreement on sale and purchase, or delivery and
receipt, of power;”.
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“5. The electric
grid, power plant and electrical equipment after the connection point of the
customer that wishes to obtain connection may be officially put into operation only
after having a full report of the partial and complete test, fully meeting the
requirements specified in this Circular, regulations on planning, land,
construction, fire prevention and fighting, environment and other relevant
legal regulations.”.
12. The title of
Article 52 shall be revised as follows:
“Article 52.
Provision of documentation required for checking whether power is on at points
of connection of equipment of power transmission units for test run or
acceptance testing purposes”.
13. Amending point dd
of clause 1 of Article 52 as follows:
“dd) The diagram
showing the details of the plan of connection of the power facility of the power
transmission unit and the parameters of the connection line;”.
14. The title of
Article 53 shall be revised as follows:
“Article 53. Power-on
status at points of connection of equipment of power transmission units for
test run or acceptance testing purposes”.
15. Amending and
supplementing point a of clause 1 of Article 53 as follows:
“a) Legal and
technical dossier:
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- The metering system
that has been completed in accordance with regulations, and in which indicators
of delivery and receipt of electricity shown by meters installed have been cut
off;”.
16. Amending and
supplementing clause 4 of Article 59 as follows:
“4. The transmission
power system operates in the extreme emergency mode when one of the following
conditions occurs or exists:
a) The frequency of
the power system falls outside of the allowable frequency range in case of a
single incident happening in the power system as specified in Article 4 hereof,
or the frequency of the power system continues to decrease to below 49.5Hz
after all backup sources have been mobilized;
b) The load-carrying
rate of any equipment within the transmission grid or any equipment connected
to the transmission grid shall be at least 110% of the rated value when failure
of such equipment occurring due to overload may lead to the disintegration of
the power system;
c) The voltage at any
node on the transmission grid is low, resulting in the relay shedding the load according
to the working low voltage; the voltage in the transmission grid is lower than
10% of the rated voltage, or there is a risk of collapse of the voltage in the power
system as calculated by the Dispatch Division when there are no adjustment
measure other than shedding of the load and the voltage continues to be in a
downward trend.”.
17. Supplementing
point dd of clause 3 of Article 60 as follows:
“dd) Impose the
configuration requirement for mobilization of the least available sources and
inertia in the power system to ensure safe operation of the power system.”.
18. Amending and
supplementing clause 3 of Article 62 as follows:
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19. Amending and
supplementing point a and c of clause 3 of Article 64 as follows:
“a) Change the
generating capacity of the generating set; stop or start the generating set to
restore the power system to the normal operating mode;
c) The automatic load
shedding system must be arranged and installed properly to ensure that the
power system does not disintegrate in case of failure or breakdown. The Power
System and Market Operator shall be responsible for determining the
installation location and setting values of the protective relays in order to
shed the load in the event of failure or breakdown occurring in the power
system to ensure safety and security of the power system;”.
Article 3. Amendments
and supplements to several Articles of the Circular No. 39/2015/TT-BCT dated
November 18, 2015 of the Minister of Industry and Trade on electricity
distribution system
1. Amending and
supplementing clause 1 of Article 37 as follows:
“1. The power plant
connected to the distribution grid with the capacity of at least 10 MW or the
transformer substation of 110 kV shall be furnished with the information system
which is connected compatibly with the information system of the authorized
Dispatch Division to serve the purposes of communication and data transmission
necessary for operation of the power system. The indispensable means of
communication intended for dispatch shall comprise direct communication
channel, telephone, and computer network.”.
2. Adding point e of
clause 2 of Article 39 as follows:
“e. Generating sets
of power plants shall maintain its grid connection when the frequency
fluctuation rate in the power system which is measured within the time frame of
500 milliseconds falls within the range from 0 Hz/second to 01 Hz/second.
3. Adding Article 40a
underneath Article 40 as follows:
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1. Sources of wind and
solar power which are, at any time, getting connected to the electric grid shall
be required to have capacity to maintain generation of power for a minimum
period of time corresponding to the respective power-generating frequency band
shown in Table 5c below:
Table
5c.
Minimum
time of maintenance of generation in proportion to frequency bands of power
systems
Frequency
band
Required
minimum time length
From 48 Hz to less
than 49 Hz
30
minutes
From 49 Hz to 51 Hz
Continuous
generation
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30
minutes
2. If the frequency
of power system is greater than 50.5 Hz, the active power generated by the
source of solar or wind power shall be reduced according to the following
formula:
Where:
- ΔP: Reduced amount
of active power (MW);
- Pm:
Active power determined at the time prior to power reduction (MW);
- fn:
Frequency of the power system prior to power reduction (Hz).
3. Sources of solar
or wind power shall be capable of maintaining continuous generation of power
within the voltage bands at connection points as prescribed in Table 5d
hereunder:
Table
5d.
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Voltage
at connection points
Required
minimum time length
Less than 50% of
the nominal voltage
Not
required
From 50% to less
than 85% of the nominal voltage
02
seconds
From 85% to 110% of
the nominal voltage
Continuous
generation
From greater than
110% to 120% of the nominal voltage
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Greater than 120%
of the nominal voltage
Not
required
4. The source of
solar or wind power shall not cause any invasion of direct current into the
power distribution grid to the extent that such current exceeds 0.5% of the
rated current at a connection point.
5. Sources of solar
or wind power shall conform to regulations on voltage, phase balance, harmonics,
voltage flicker and earthing mode prescribed in Article 5, 6, 7, 8 and 10
herein.
6. Sources of solar
or wind power shall be equipped with security devices meeting the following
requirements:
a) Automatically
disconnect the power distribution grid in case of failure or breakdown occurring
inside the source of solar or wind power;
b) Automatically
disconnect the power distribution grid in case of loss of power supplied from
the power distribution grid and fail to produce power to be supplied to the
power distribution grid in case of loss of electricity currently taking place
in the power distribution grid;
c) Do not
automatically reconnect the electric grid when the following requirements have
not been satisfied yet:
- The power grid’s
frequency is maintained within the band from 48Hz to 51Hz during the minimum
period of 60 seconds;
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d) Customers
demanding connection shall negotiate and agree on the requirements regarding
security systems with power distribution units, inter alia including at least
protections specified in point a, b and c of this clause, over-voltage, low-voltage
and frequency protection.
7. In addition to the
requirements specified in clause 1 through 6 of this Article, sources of solar
or wind power with capacity of between 100 kW and 1 MW connected to the
medium-voltage grid must satisfy the following technical requirements:
a) Ensure that the
reactive power control mode is activated according to the power factor control
mode with the power factor value (cosphi) set at the request of the authorized
Dispatch Division, unless otherwise agreed upon with the authorized Dispatch
Division;
b) Have the capacity
to set the priority mode of generation of active or reactive power at the
request of the authorized Dispatch Division when voltage at connection points
falls outside the band of continuous operation requirements specified in clause
3 of this Article.
8. Investors in
sources of solar and wind power connected to the medium-voltage grid with the
capacity of between 100 kW and 1 MW shall be responsible for negotiating and
reaching agreement with the power distribution unit on equipment and means of
connection with the collection, monitoring and control system of the
distribution Dispatch Division.”
4. Adding point d to
clause 1 of Article 42 as follows:
“d) Total rated
capacity of power plants under the Control Center shall not exceed the rated
capacity of the largest generating set in operation in the national power
system as determined by the Power System and Market Operator.”.
5. The title of
Article 47 shall be revised as follows:
“Article 47. Requirements
concerning provision of the dossier for checking whether power is on at connection
points for test run or acceptance test purposes to be imposed upon customers having
access to the power distribution grid connected to the power system at a
voltage of 110 kV and customers whose generating sets are connected to the
power system at the medium voltage".
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“Article 48. Requirements
concerning provision of the dossier for checking whether power is on at
connection points for test run or acceptance test purposes to be imposed upon customers
whose stations of their own are connected to the medium-voltage grid”.
7. The title of
Article 49 shall be revised as follows:
“Article 49.
Checking whether power is on at connection points for test run and acceptance
testing purposes”.
8. Amending and
supplementing clause 3 of Article 49 as follows:
“3. Power
distribution units shall be responsible for agreeing with the customers who
demand power connection on the process of checking the submitted documents, the
report of acceptance test and the actual status of installation of equipment as
per the Connection Agreement.”.
9. The title of
Article 50 shall be revised as follows:
“Article 50. Power-on
status at connection points for test run and acceptance testing purposes”.
10. Amending and
supplementing point a of clause 1 of Article 50 as follows:
“a) Legal and
technical dossier:
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- Copy of the Report
of inspection of power-on status at the connection points, stating that it has
fully met the requirements set forth in the Connection Agreement;
- The metering system
that has been completed and on which indicators of electricity delivery and
receipt have been cut off;
- The Power Purchase
Agreement signed, or the agreement on sale and purchase, or delivery and
receipt, of power;”.
11. Supplementing
clause 4 of Article 50 as follows:
“4. For the
customers using electricity connected to the medium-voltage grid, it is allowed
to turn on power at the connection points immediately after having the report
of inspection of the power-on status at connection points, stating that they
comply with the requirements set forth in the Connection Agreement, fully meet
legal, technical, dispatching and operational requirements specified in clause
1 of this Article, and electrical safety requirements.”.
12. Amending and
supplementing point d of clause 1 of Article 51 as follows:
“d) The electric
grid, power plant and electrical equipment after connection points of the
customer that wishes to obtain connection may be officially put into operation
only after having a full report of the partial and complete test, fully meeting
the requirements specified in this Circular, regulations on planning, land,
construction, fire prevention and fighting, environment and other relevant
legal regulations.”.
13. The title of
Article 55 shall be revised as follows:
“Article 55.
Provision of documentation required for checking whether power is on at points
of connection to equipment of power distribution units for test run or
acceptance testing purposes”.
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“Article 56.
Power-on status at points of connection of equipment of power distribution
units for test run or acceptance testing purposes”.
15. Amending and
supplementing point a of clause 1 of Article 56 as follows:
“a) Legal and
technical dossier:
- Written
confirmation and commitment of the Investor stating that equipment within the
power-on range has been tested and checked to meet the operational and
technical requirements agreed at the connection points, and fully comply with
the law;
- The metering system
that has been completed and on which indicators of electricity delivery and
receipt have been cut off;”.
16. Amending and
supplementing clause 1 of Article 62 as follows:
“1. Manage and
operate electric equipment and grids falling within their remit to ensure that
they meet operational and technical requirements set out in this Circular, and
comply with regulations regarding Dispatch Procedures, Operating Procedures, Troubleshooting/Failure
or Breakdown Response Procedures in the national power system adopted by the
Ministry of Industry and Trade, and other relevant legal regulations.”.
17. Amending and
supplementing point a of clause 1 of Article 64 as follows:
“a) Manage and
operate electric equipment and grids falling within their remit to ensure that
they meet operational and technical requirements set out in this Circular, and
comply with regulations regarding Dispatch Procedures, Operating Procedures,
Troubleshooting/Failure or Breakdown Response Procedures in the national power
system adopted by the Ministry of Industry and Trade, and other relevant legal
regulations.”.
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"2a. Departments
of Industry and Trade of provinces and centrally-run cities shall be
responsible for inspecting and supervising the compliance with the provisions
of this Circular within their range of authority.”.
Article 4.
Implementation provisions
1. This Circular is
entering into force as of February 16, 2023.
2. Rescinding several
articles and clauses of the Circular No. 25/2016/TT-BCT dated November 30, 2016
of the Minister of Industry and Trade on electricity transmission system, and
the Circular No. 39/2015/TT-BCT dated November 18, 2015 of Minister of Industry
and Trade on electricity distribution system, as follows:
a) Deleting the second hyphen of point a of
clause 3 of Article 92 and clause 2 of Article 94 of the Circular No.
25/2016/TT-BCT dated November 30, 2016 of the Minister of Industry and Trade on
electricity transmission system;
b) Deleting Article 92, 93, 94, 95, 96, 97
and 98 in the
Circular No. 39/2015/TT-BCT dated November 18, 2015 of Minister of Industry and
Trade on electricity distribution system.
3. Where electrical equipment has been put
into operation, or there is a contract for procurement and installation of
equipment in force before the effective date of this Circular that prescribes
technical requirements and specifications different from those specified in
this Circular, relevant regulations in force before the effective date of this
Circular shall govern.
4. In the course of implementation of this
Circular, if there is any difficulty that may arise, entities concerned shall
send feedback to the Electricity Regulatory Authority to seek its decision or
action within its jurisdiction, or for its reporting to the Ministry of
Industry and Trade to seek its solution./.
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PP. MINISTER
DEPUTY MINISTER
Dang Hoang An