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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