CN112491082A - Power grid cooperative voltage control method based on distributed power supply access - Google Patents

Power grid cooperative voltage control method based on distributed power supply access Download PDF

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Publication number
CN112491082A
CN112491082A CN202011254591.7A CN202011254591A CN112491082A CN 112491082 A CN112491082 A CN 112491082A CN 202011254591 A CN202011254591 A CN 202011254591A CN 112491082 A CN112491082 A CN 112491082A
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inverter
power
voltage
sent
calculating
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CN202011254591.7A
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周泽
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Shenyang Electric Industry Co ltd
Sheyang Power Supply Branch State Grid Jiangsu Electric Power Co ltd
Yancheng Power Supply Co of State Grid Jiangsu Electric Power Co Ltd
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Shenyang Electric Industry Co ltd
Sheyang Power Supply Branch State Grid Jiangsu Electric Power Co ltd
Yancheng Power Supply Co of State Grid Jiangsu Electric Power Co Ltd
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Publication of CN112491082A publication Critical patent/CN112491082A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/48—Controlling the sharing of the in-phase component
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention provides a power grid collaborative voltage control method based on distributed power supply access, which comprises the following steps: (1): setting a reference value; (2): collecting information; (3): calculating a capacity constraint angle of the inverter; (4): judging whether the voltage of the access point is greater than a target voltage limit value, if so, carrying out (5); if not, to (2); (5): judging whether the power factor angle is smaller than the capacity constraint angle, if so, going to (6); if not, to (8); (6): calculating the reactive power required to be sent out by the inverter; (7): correcting to (13); (8): judging whether the inverter reaches the maximum capacity and does not reach the maximum power factor angle, if so, going to (9); if not, to (11); (9): calculating active power required to be sent by the inverter; (10): correcting to (13); (11): calculating active power required to be sent by the inverter; (12): correcting to (13); (13): and outputting a control command and a control quantity to the inverter.

Description

Power grid cooperative voltage control method based on distributed power supply access
Technical Field
The invention belongs to the technical field of power control, and particularly relates to a power grid cooperative voltage control method based on distributed power supply access.
Background
With the continuous development of human society, people have more and more demands on energy. With the increasing environmental problems caused by the consumption of traditional energy sources, renewable new energy sources are increasingly used by people.
When more and more distributed power supplies are connected to the power distribution network, the proportion of the distributed power supplies in the power distribution network is larger and larger, and the energy utilization rate is improved while huge impact is brought to the power distribution network.
The invention provides a power grid cooperative voltage control method based on distributed power supply access, wherein an inverter participates in a voltage regulation process, different control regulation modes of the inverter are determined according to the power of the inverter, a power factor angle and the voltage of a distributed power supply access point, and the utilization rate of the capacity of the inverter is improved by regulating the power factor to send out inductive reactive power for voltage regulation, meanwhile, the reactive power transmission on a line is reduced, and the power loss and the voltage loss of a power distribution network are reduced.
Disclosure of Invention
The invention provides a power grid cooperative voltage control method based on distributed power supply access, which improves the utilization rate of the capacity of an inverter, reduces reactive transmission on a line and reduces the power loss and the voltage loss of a power distribution network.
The invention specifically relates to a power grid cooperative voltage control method based on distributed power supply access, which comprises the following steps:
step (1): setting a target voltage limit value of the distributed power supply access point and a maximum power factor angle of the inverter according to the local load condition;
step (2): collecting the power and the power factor angle of the inverter, and collecting the voltage of the distributed power supply access point;
and (3): calculating the capacity constraint angle of the inverter;
and (4): judging whether the voltage of the distributed power supply access point is greater than the target voltage limit value, if so, entering a step (5); if not, returning to the step (2);
and (5): judging whether the inverter power factor angle is smaller than the inverter capacity constraint angle or not, and if so, entering a step (6); if not, entering the step (8);
and (6): calculating reactive power required to be sent by the inverter;
and (7): correcting reactive power required to be sent by the inverter, and entering the step (13);
and (8): judging whether the inverter reaches the maximum capacity and does not reach the maximum power factor angle, if so, entering a step (9); if not, entering the step (11);
and (9): calculating active power required to be sent by the inverter;
step (10): correcting active power required to be sent by the inverter, and entering a step (13);
step (11): calculating active power required to be sent by the inverter;
step (12): correcting active power required to be sent by the inverter, and entering a step (13);
step (13): and outputting a control command and a control quantity to the inverter, and implementing voltage control.
The inverter capacity constraint angle is
Figure BDA0002772688920000021
P is the output active power of the inverter, SmaxOutputting maximum power for the inverter.
The reactive power required to be emitted by the inverter is
Figure BDA0002772688920000022
U0For line head end voltage, UkFor the distributed power supply access point voltage, Uk,limIs a target voltage limit, X, of the distributed power access point∑kIs the line reactance; calculating the reactive power correction value required to be sent by the inverter
Figure BDA0002772688920000023
Uk,aTo correct the parameters.
The active power required to be generated by the inverter in the step (9) is
Figure RE-GDA0002930406680000024
Figure RE-GDA0002930406680000025
，R∑kIs the line impedance; calculating the active power correction value required to be sent by the inverter
Figure RE-GDA0002930406680000026
Uk,bFor correcting the parameters, UbThe voltage value of the distributed power access point when the inverter reaches the maximum capacity constraint angle is obtained.
The active power required to be generated by the inverter in the step (11) is
Figure BDA0002772688920000027
Calculating the active power correction value required to be sent by the inverter
Figure BDA0002772688920000028
Uk,cFor correcting the parameters, UcThe voltage value of the distributed power supply access point when the inverter reaches the maximum power factor angle is obtained.
Compared with the prior art, the beneficial effects are: according to the power grid collaborative voltage control method, different control adjustment modes of the inverter are determined according to the power of the inverter, the power factor angle and the distributed power supply access point voltage, the utilization rate of the capacity of the inverter is improved, meanwhile, reactive power transmission on a line is reduced, and the power loss and the voltage loss of a power distribution network are reduced.
Drawings
Fig. 1 is a working flow chart of a power grid cooperative voltage control method based on distributed power access.
Detailed Description
The following describes in detail a specific implementation of the grid coordinated voltage control method based on distributed power access according to the present invention with reference to the accompanying drawings.
As shown in fig. 1, the grid coordinated voltage control method of the present invention includes the following steps:
firstly, a target voltage limit value of a distributed power supply access point and an inverter maximum power factor angle are set according to a local load condition.
Secondly, collecting the power and the power factor angle of the inverter, collecting the voltage of a distributed power supply access point, and calculating the capacity restriction angle of the inverter
Figure BDA0002772688920000031
P is the output active power of the inverter, SmaxOutputting maximum power for the inverter.
Thirdly, determining different control modes of the inverter:
judging whether the voltage of the distributed power supply access point is greater than the target voltage limit value, if not, continuing to acquire signals; if yes, further judging whether the inverter power factor angle is smaller than the inverter capacity constraint angle,
if yes, entering a reactive compensation stage of an inverter voltage control strategy: calculating the reactive power required to be emitted by the inverter
Figure BDA0002772688920000032
U0For line head end voltage, UkFor the distributed power supply access point voltage, Uk,limIs a target voltage limit, X, of the distributed power access point∑kIs the line reactance; correcting the reactive power required to be emitted by the inverter
Figure BDA0002772688920000033
Uk,aTo correct the parameters;
if not, judging whether the inverter reaches the maximum capacity and does not reach the maximum power factor angle,
if yes, entering a maximum power adjustment stage of the inverter voltage control strategy: calculating the active power required to be emitted by the inverter
Figure RE-GDA0002930406680000041
Figure RE-GDA0002930406680000042
，R∑kCorrecting the active power required to be delivered by the inverter for said line impedance
Figure RE-GDA0002930406680000043
Uk,bFor correcting the parameters, UbThe voltage value of the distributed power supply access point when the inverter reaches a maximum capacity constraint angle is obtained;
if not, entering a power reduction stage of the inverter voltage control strategy: calculating the active power required to be emitted by the inverter
Figure BDA0002772688920000042
Correcting active power required to be emitted by the inverter
Figure BDA0002772688920000043
Uk,cFor correcting the parameters, UcThe voltage value of the distributed power access point when the inverter reaches the maximum power factor angle.
Finally, the inverter is output with a control command and a control amount, and voltage control is performed.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (5)

1. A power grid cooperative voltage control method based on distributed power access is characterized by comprising the following steps:
step (1): setting a target voltage limit value of the distributed power supply access point and a maximum power factor angle of an inverter according to a local load condition;
step (2): collecting the power and the power factor angle of the inverter, and collecting the voltage of the distributed power supply access point;
and (3): calculating the capacity constraint angle of the inverter;
and (4): judging whether the voltage of the distributed power supply access point is greater than the target voltage limit value, if so, entering a step (5); if not, returning to the step (2);
and (5): judging whether the inverter power factor angle is smaller than the inverter capacity constraint angle or not, if so, entering the step (6); if not, entering the step (8);
and (6): calculating reactive power required to be sent by the inverter;
and (7): correcting reactive power required to be sent by the inverter, and entering the step (13);
and (8): judging whether the inverter reaches the maximum capacity and does not reach the maximum power factor angle, if so, entering a step (9); if not, entering the step (11);
and (9): calculating active power required to be sent by the inverter;
step (10): correcting active power required to be sent by the inverter, and entering a step (13);
step (11): calculating active power required to be sent by the inverter;
step (12): correcting active power required to be sent by the inverter, and entering a step (13);
step (13): and outputting a control command and a control quantity to the inverter, and implementing voltage control.
2. The grid collaborative voltage control method based on distributed power access of claim 1, wherein the inverter capacity constraint angle is
Figure FDA0002772688910000011
P is the output active power of the inverter, SmaxOutputting maximum power for the inverter.
3. The grid coordinated voltage control method based on distributed power access of claim 2, wherein the reactive power required to be generated by the inverter is
Figure FDA0002772688910000012
U0For line head end voltage, UkFor the distributed power supply access point voltage, Uk,limIs a target voltage limit, X, of the distributed power access pointΣkIs the line reactance; calculating the reactive power correction value required to be sent by the inverter
Figure FDA0002772688910000013
Uk,aTo correct the parameters.
4. The grid coordinated voltage control method based on distributed power access according to claim 3, wherein the active power required to be generated by the inverter in step (9) is,
Figure RE-FDA0002930406670000021
Figure RE-FDA0002930406670000022
Figure RE-FDA0002930406670000023
R∑kis the line impedance; calculating the active power required to be emitted by the inverterPower correction value
Figure RE-FDA0002930406670000024
Uk,bFor correcting the parameters, UbThe voltage value of the distributed power access point when the inverter reaches the maximum capacity constraint angle is obtained.
5. The grid collaborative voltage control method based on distributed power access according to claim 4, wherein the active power required to be generated by the inverter in the step (11) is active power required to be generated by the inverter
Figure FDA0002772688910000024
Calculating the active power correction value required to be sent by the inverter
Figure FDA0002772688910000025
Uk,cFor correcting the parameters, UcThe voltage value of the distributed power access point when the inverter reaches the maximum power factor angle.
CN202011254591.7A 2020-11-11 2020-11-11 Power grid cooperative voltage control method based on distributed power supply access Withdrawn CN112491082A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115313528A (en) * 2022-10-11 2022-11-08 力高(山东)新能源技术股份有限公司 AGC active power adjusting method for new energy power station

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115313528A (en) * 2022-10-11 2022-11-08 力高(山东)新能源技术股份有限公司 AGC active power adjusting method for new energy power station

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