CN112398152A - Dynamic reactive voltage control method for electrochemical energy storage power station - Google Patents

Dynamic reactive voltage control method for electrochemical energy storage power station Download PDF

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Publication number
CN112398152A
CN112398152A CN202011399810.0A CN202011399810A CN112398152A CN 112398152 A CN112398152 A CN 112398152A CN 202011399810 A CN202011399810 A CN 202011399810A CN 112398152 A CN112398152 A CN 112398152A
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voltage
energy storage
reactive
station
control
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杜炜凝
于晓蒙
周杨
徐艺敏
刘昶
戴星宇
孙海翔
岳帅
徐波
王银川
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State Grid Jiangsu Electric Power Co ltd Zhenjiang Power Supply Branch
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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
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • 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
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • 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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  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a dynamic reactive voltage control method for an electrochemical energy storage power station.A voltage automatic reactive power control master station of the AVC (automatic voltage control) station is based on the criteria of a local power regulation radiation network structure and reactive local balance, and incorporates the electrochemical energy storage power station into the reactive voltage control of a master station of an AVC dispatching end of a power grid by adopting automatic and manual voltage reactive control strategies; the AVC plant terminal station reactive voltage automatic control is mainly participated by an electrochemical energy storage power station reactive voltage automatic control substation, an electrochemical energy storage power station unit monitoring system, an electrochemical energy storage power station booster station monitoring system, a dynamic reactive power compensation device monitoring system and the like together, and the reactive voltage automatic control of the electrochemical energy storage power station based on the regional voltage quality is realized.

Description

Dynamic reactive voltage control method for electrochemical energy storage power station
Technical Field
The invention relates to a dynamic reactive voltage control method for an electrochemical energy storage power station, and belongs to the technical field of energy storage power station equipment.
Background
Currently, there are several forms of energy storage in the world: pumped storage, Compressed Air Energy Storage (CAES), electrochemical energy storage, Flywheel Energy Storage System (FESS), solar thermal storage, natural gas storage, and the like. In recent years, electrochemical energy storage in the power industry is rapidly developed, and becomes a development trend in the future. Encouraged by national energy policies, the development momentum of new energy is not reduced, the proportion of the new energy to the total installation of a power grid is continuously increased, but the new energy is limited by factors such as weak grid structure, system peak regulation, stable voltage and the like, and the problems of conveying capacity, frequency modulation peak regulation, electric power consumption, system stability and the like are increasingly prominent. The energy storage system can well smooth the whole output and wind power fluctuation of the photovoltaic power station, reduce the impact of wind power and photovoltaic power station access on a power grid, improve the output characteristic of large-scale renewable energy, and promote the consumption of distributed renewable energy at a user side, the response at a demand side, peak clipping and valley filling and the like. The energy storage facility can effectively realize demand side management in the system, improve peak-valley difference between day and night and smooth load, more effectively utilize power equipment, reduce power supply cost, promote application of renewable energy sources, and can also be used as a means for improving system operation stability, adjusting frequency and compensating load fluctuation.
Because the electrochemical energy storage power station adopts a large amount of power electronic equipment, the reaction speed is not reached by the traditional energy storage power station. The active power output control of the energy storage equipment generally adopts AGC control, and the reaction time is in the second level, so that the output fluctuation of an electrochemical energy storage power station is large, and the voltage quality is seriously influenced. In order to meet the demand of continuously improving the voltage management level of the power grid, and simultaneously, in order to enable the electrochemical energy storage power station to operate in an orderly and standard grid-connected mode, the power grid system needs to perform more effective reactive voltage control on the electrochemical energy storage power station, optimize reactive distribution of the power grid and improve the voltage level of the power grid.
Disclosure of Invention
The invention aims to provide a dynamic reactive voltage control method for an electrochemical energy storage power station, which adopts multiple regulation modes and improves the voltage quality of a system under the same output fluctuation condition of the electrochemical energy storage power station.
The purpose of the invention is realized by the following technical scheme:
a dynamic reactive voltage control method of an electrochemical energy storage power station,
the method comprises the following steps: the AVC master station control method comprises the following steps:
1) and (3) automatic voltage control: detecting the voltage value of a grid-connected point, and judging whether the voltage value meets the power grid regulation, namely whether the voltage value is in a rated voltage range of 0-7%;
when the voltage is lower than the rated value, the master station sends a voltage instruction U to the substationd＝Uo+0.1 kV; when the voltage is higher than the rated value of 1.07, the master station sends a voltage instruction U to the substationd＝Uo-0.1kV, instruction cycle 5 min/time;
2) voltage manual control: manually setting a voltage command value UdThe instruction cycle is 5 min/time;
3) reactive automatic control: detecting the voltage value of a grid-connected point, and judging whether the voltage value meets the power grid regulation, namely whether the voltage value is in a rated voltage range of 0-7%;
when the voltage is lower than the rated value, the master station sends a voltage instruction Q to the substationsvg_d＝Qsvg+0.5 Mvar; when the voltage is higher than the rated value of 1.07, the main station sends a voltage instruction Q to the substationsvg_d＝Qsvg0.5Mvar, instruction cycle 5 min/time;
4) reactive manual control: manually setting reactive power instruction value Qsvg_dThe instruction cycle is 5 min/time;
voltage out-of-limit adopts out-of-limit correction control, and under the condition of enough reactive power, the bus voltage is pulled into a normal control limit range; under the condition of insufficient reactive power, reducing the out-of-limit condition of the bus voltage until the reactive power reaches the upper limit;
step two: the substation control method comprises the following steps:
1) equivalent mathematical model of energy storage power station
The equivalent mathematical model of the energy storage power station is as follows:
Figure BDA0002812178130000021
2) voltage control mode reactive power calculation model:
Figure BDA0002812178130000022
reactive power output target value Q of reactive power compensator of energy storage power stationsvg_fActive power output P to each PCSpcsiThe partial derivatives of (a) are:
Figure BDA0002812178130000023
reactive power output target value Q of reactive power compensator of energy storage power stationsvg_fTo grid point voltage UoThe partial derivatives of (a) are:
Figure BDA0002812178130000024
under the steady state condition of a power grid, the reactive voltage automatic control substation of the electrochemical energy storage power station needs to ensure that the active power output is not influenced, and the reactive power output of each PCS keeps zero;
according to the voltage set value UMAnd the grid point voltage UoAnd a reactive power reference value Q is output through a PI control linksvg_f(ii) a When the system control mode is the voltage control mode, the reactive power control instruction value Qsvg_dIs equal to Qsvg_f；
3) The reactive power control model is as follows:
grid point voltage UoReactive output Q for energy storage power stationsvgiThe partial derivatives are:
Figure BDA0002812178130000031
grid point voltage UoActive power output P of each PCS of energy storage power stationpcsiThe partial derivatives are:
Figure BDA0002812178130000032
according to reactive power control reactive power instruction value Qsvg_dAnd the current reactive value Q of the SVG compensation devicesvgThe difference is controlled by a dead zone of +/-0.5 Mvar, and then a voltage reference value U is output through a PI control linkref；
In the formula:
Uothe voltage of a grid-connected point of the energy storage power station is in kV;
Usthe unit is kV for the system equivalent voltage;
Rsthe unit is kV omega;
Xsthe unit is omega;
Ppcsithe unit of the I th PCS active power of the energy storage power station is MW, and the number of the PCS is n;
Qpcsithe unit is Mvar for the ith PCS reactive power of the energy storage power station;
Qsvgithe unit of the SVG reactive power of the ith station of the energy storage power station is Mvar;
UMthe unit is a voltage control target value in the voltage control mode and is kV;
Qsvg_fthe unit is Mvar, which is a reactive calculation value in a voltage control mode;
Qsvg_dthe input range is the output range of the system SVG, and the unit is Mvar;
Udis a voltage command value with the unit of kV;
the PCS is an energy storage power station battery alternating current-direct current converter; the SVG is a static var generator; the AVC main station is a dispatching end AVC control system, and the AVC sub-station is a plant station end AVC control system; the grid-connected point is a busbar of the energy storage power station, and for a 10kV energy storage power station, the grid-connected point is a 10kV busbar; and the instruction period is the period of issuing the instruction to the substation by the master station, and the master station issues the AVC instruction to the substation every corresponding time.
The object of the invention can be further achieved by the following technical measures:
the dead zone is controlled by +/-0.5 Mvar, and the dead zone is controlled by 0.5Mvar for reducing system fluctuation generated by a control system due to the dead zone of the field SVG equipment.
Compared with the prior art, the invention has the beneficial effects that: the electrochemical energy storage power station uses the control method, so that the high-efficiency utilization of power electronic equipment such as an energy storage grid-connected inverter, an energy storage power station SVG and the like is realized, the dynamic reactive power regulation capability of the electrochemical energy storage power station is fully exerted, and the dynamic real-time control of the reactive voltage of the electrochemical energy storage power station is realized. The invention improves the voltage level of 10kV, meets the requirement of continuously improving the voltage management level of a power grid, and provides technical support for orderly and normative grid-connected operation of an electrochemical energy storage power station. According to the method, the energy storage power station and the traditional plant station are combined, the regional reactive voltage automatic control is realized, the reactive power regulation capability of the energy storage power station is fully exerted on the premise that the active power of the energy storage power station is not affected, and the regional voltage quality is improved.
Drawings
FIG. 1 is a schematic diagram of an AVC regional power grid architecture;
FIG. 2 is a diagram of an AVC substation architecture;
FIG. 3 is an equivalent mathematical model of an energy storage power station;
FIG. 4 is a substation voltage control model;
fig. 5 is a substation reactive power control model.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Fig. 1 is a schematic diagram of an AVC regional power grid structure, and fig. 2 is a structural diagram of an AVC substation. The PCS is an energy storage power station battery alternating current-direct current converter; SVG is static var generator.
The invention discloses a dynamic reactive voltage control method of an electrochemical energy storage power station, which comprises the following technical scheme:
the AVC main station is a dispatching end AVC control system, and the AVC sub-station is a factory station end AVC control system. The grid-connected point is a busbar of the energy storage power station, and for a 10kV energy storage power station, the grid-connected point is a 10kV busbar; and the instruction period is the period in which the master station issues the instructions to the substation, and the master station can issue AVC instructions to the substation every other corresponding time.
The method comprises the following steps: in the master station control scheme, an AVC master station and an AVC substation are connected in a closed-loop manner to form a system. And the AVC main station brings the electrochemical energy storage power station into the reactive voltage control of the AVC main station of the power grid based on the criterion of the construction of the local control radiation network and the reactive local balance. The AVC master station control method comprises the following steps:
1) and (3) automatic voltage control: and detecting whether the voltage value of the grid-connected point meets the power grid regulation, namely whether the voltage value is in a rated voltage range of 0-7%.
When the voltage is lower than the rated value, the master station sends a voltage instruction U to the substationd＝Uo+0.1 kV; when the voltage is higher than the rated value of 1.07, the master station sends a voltage instruction U to the substationd＝Uo-0.1kV, instruction cycle 5 min/time.
2) Manually controlling voltage and manually setting voltage command value UdInstruction cycle 5 min/time.
3) And (4) reactive automatic control, namely detecting whether the voltage value of the grid-connected point meets the power grid regulation, namely whether the voltage value is in the rated voltage range of 0-7%.
When the voltage is lower than the rated value, the master station sends a voltage instruction Q to the substationsvg_d＝Qsvg+0.5 Mvar; when the voltage is higher than the rated value of 1.07, the main station sends a voltage instruction Q to the substationsvg_d＝Qsvg0.5Mvar, instruction cycle 5 min/time.
4) Reactive handDynamic control, manual setting of reactive power command value Qsvg_dInstruction cycle 5 min/time.
Voltage out-of-limit adopts out-of-limit correction control, and under the condition of enough reactive power, the bus voltage is pulled into a normal control limit range; under the condition of not having enough reactive power, the out-of-limit condition of the bus voltage is reduced to the maximum capacity.
Step two: the substation control technical scheme is as follows: the electrochemical energy storage power station side reactive voltage automatic control is jointly participated by an electrochemical energy storage power station reactive voltage automatic control substation, an electrochemical energy storage power station unit monitoring system, an electrochemical energy storage power station booster station monitoring system, a dynamic reactive power compensation device monitoring system and the like. The AVC substation control method comprises the following steps:
1) equivalent mathematical model of energy storage power station
According to fig. 3, the equivalent mathematical model of the energy storage power station can be simplified as follows:
Figure BDA0002812178130000051
2) voltage control mode reactive power calculation model
Figure BDA0002812178130000052
Reactive power output target value Q of reactive power compensator of energy storage power stationsvg_fActive power output P to each PCSpcsiThe partial derivatives of (a) are:
Figure BDA0002812178130000053
reactive power output target value Q of reactive power compensator of energy storage power stationsvg_fTo grid point voltage UoThe partial derivatives of (a) are:
Figure BDA0002812178130000054
under the steady state condition of a power grid, the reactive voltage automatic control substation of the electrochemical energy storage power station needs to ensure that the active power output is not influenced, and the reactive power output of each PCS keeps zero.
The voltage control model is shown in FIG. 4, and is based on a voltage set value UMAnd the grid point voltage UoAnd a reactive power reference value Q is output through a PI control linksvg_f. When the system control mode is the voltage control mode, the reactive power control instruction value Qsvg_dIs equal to Qsvg_f。
3) The reactive power control model is
Grid point voltage UoReactive output Q for energy storage power stationsvgiThe partial derivatives are:
Figure BDA0002812178130000061
grid point voltage UoActive power output P of each PCS of energy storage power stationpcsiThe partial derivatives are:
Figure BDA0002812178130000062
the reactive power control model is shown in FIG. 5, and the reactive power command value Q is controlled according to the reactive powersvg_dAnd the current reactive value Q of the SVG compensation devicesvgThe difference is controlled by a dead zone of +/-0.5 Mvar, and then a voltage reference value U is output through a PI control linkref。
In the formula:
Uothe voltage of a grid-connected point of the energy storage power station is in kV;
Usthe unit is kV for the system equivalent voltage;
Rsthe unit is kV omega;
Xsthe unit is omega;
Ppcsithe unit of the I th PCS active power of the energy storage power station is MW, and the number of the PCS is n;
Qpcsithe unit is Mvar for the ith PCS reactive power of the energy storage power station;
Qsvgithe unit of the SVG reactive power of the ith station of the energy storage power station is Mvar;
UMthe unit is a voltage control target value in the voltage control mode and is kV;
Qsvg_fthe unit is Mvar, which is a reactive calculation value in a voltage control mode;
Qsvg_dthe reactive instruction value is in a reactive control mode, the input range of the reactive instruction value is the output range of the system SVG, and the unit is Mvar.
UdThe unit is kV as a voltage command value.
The dead zone is controlled by +/-0.5 Mvar, and the dead zone control with the dead zone of 0.5Mvar is set for reducing system fluctuation generated by a control system due to the dead zone of the field SVG device.
It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (2)

1. A dynamic reactive voltage control method for an electrochemical energy storage power station is characterized by comprising the following steps:
the method comprises the following steps: the AVC master station control method comprises the following steps:
1) and (3) automatic voltage control: detecting the voltage value of a grid-connected point, and judging whether the voltage value meets the power grid regulation, namely whether the voltage value is in a rated voltage range of 0-7%;
when the voltage is lower than the rated value, the master station sends a voltage instruction U to the substationd＝Uo+0.1 kV; when the voltage is higher than the rated value of 1.07, the master station sends a voltage instruction U to the substationd＝Uo-0.1kV, instruction cycle 5 min/time;
2) voltage manual control: manually setting a voltage command value UdThe instruction cycle is 5 min/time;
3) reactive automatic control: detecting the voltage value of a grid-connected point, and judging whether the voltage value meets the power grid regulation, namely whether the voltage value is in a rated voltage range of 0-7%;
when the voltage is lower than the rated value, the master station sends a voltage instruction Q to the substationsvg_d＝Qsvg+0.5 Mvar; when the voltage is higher than the rated value of 1.07, the main station sends a voltage instruction Q to the substationsvg_d＝Qsvg0.5Mvar, instruction cycle 5 min/time;
4) reactive manual control: manually setting reactive power instruction value Qsvg_dThe instruction cycle is 5 min/time;
voltage out-of-limit adopts out-of-limit correction control, and under the condition of enough reactive power, the bus voltage is pulled into a normal control limit range; under the condition of insufficient reactive power, reducing the out-of-limit condition of the bus voltage until the reactive power reaches the upper limit;
step two: the substation control method comprises the following steps:
1) equivalent mathematical model of energy storage power station
The equivalent mathematical model of the energy storage power station is as follows:
Figure FDA0002812178120000011
2) voltage control mode reactive power calculation model:
Figure FDA0002812178120000012
reactive power output target value Q of reactive power compensator of energy storage power stationsvg_fTo eachPCS active power PpcsiThe partial derivatives of (a) are:
Figure FDA0002812178120000013
reactive power output target value Q of reactive power compensator of energy storage power stationsvg_fTo grid point voltage UoThe partial derivatives of (a) are:
Figure FDA0002812178120000021
under the steady state condition of a power grid, the reactive voltage automatic control substation of the electrochemical energy storage power station needs to ensure that the active power output is not influenced, and the reactive power output of each PCS keeps zero;
according to the voltage set value UMAnd the grid point voltage UoAnd a reactive power reference value Q is output through a PI control linksvg_f(ii) a When the system control mode is the voltage control mode, the reactive power control instruction value Qsvg_dIs equal to Qsvg_f；
3) The reactive power control model is as follows:
grid point voltage UoReactive output Q for energy storage power stationsvgiThe partial derivatives are:
Figure FDA0002812178120000022
grid point voltage UoActive power output P of each PCS of energy storage power stationpcsiThe partial derivatives are:
Figure FDA0002812178120000023
according to reactive power control reactive power instruction value Qsvg_dAnd the current reactive value Q of the SVG compensation devicesvgThe difference is controlled by a dead zone of +/-0.5 Mvar, and then a voltage reference value U is output through a PI control linkref；
In the formula:
Uothe voltage of a grid-connected point of the energy storage power station is in kV;
Usthe unit is kV for the system equivalent voltage;
Rsthe unit is kV omega;
Xsthe unit is omega;
Ppcsithe unit of the I th PCS active power of the energy storage power station is MW, and the number of the PCS is n;
Qpcsithe unit is Mvar for the ith PCS reactive power of the energy storage power station;
Qsvgithe unit of the SVG reactive power of the ith station of the energy storage power station is Mvar;
UMthe unit is a voltage control target value in the voltage control mode and is kV;
Qsvg_fthe unit is Mvar, which is a reactive calculation value in a voltage control mode;
Qsvg_dthe input range is the output range of the system SVG, and the unit is Mvar;
Udis a voltage command value with the unit of kV;
the PCS is an energy storage power station battery alternating current-direct current converter; the SVG is a static var generator; the AVC main station is a dispatching end AVC control system, and the AVC sub-station is a plant station end AVC control system; the grid-connected point is a busbar of the energy storage power station, and for a 10kV energy storage power station, the grid-connected point is a 10kV busbar; and the instruction period is the period of issuing the instruction to the substation by the master station, and the master station issues the AVC instruction to the substation every corresponding time.
2. The electrochemical energy storage power station dynamic reactive voltage control method of claim 1, wherein said dead zone is a ± 0.5Mvar dead zone control, and due to the dead zone of the on-site SVG equipment, the dead zone control with the dead zone of 0.5Mvar is provided to reduce system fluctuations generated by the control system.
CN202011399810.0A 2020-12-02 2020-12-02 Dynamic reactive voltage control method for electrochemical energy storage power station Pending CN112398152A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114050581A (en) * 2021-11-15 2022-02-15 许继集团有限公司 Multi-reactive-power-source hierarchical dynamic coordination control method and device for power station

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114050581A (en) * 2021-11-15 2022-02-15 许继集团有限公司 Multi-reactive-power-source hierarchical dynamic coordination control method and device for power station

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