CN114094639B - Photovoltaic power station transient frequency active support self-adaptive control method, system and device - Google Patents

Photovoltaic power station transient frequency active support self-adaptive control method, system and device Download PDF

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CN114094639B
CN114094639B CN202111394597.9A CN202111394597A CN114094639B CN 114094639 B CN114094639 B CN 114094639B CN 202111394597 A CN202111394597 A CN 202111394597A CN 114094639 B CN114094639 B CN 114094639B
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power
power system
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photovoltaic power
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CN114094639A (en
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高丙团
孙睿哲
胡正阳
王满亮
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Southeast University
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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
    • 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
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H02J3/241—The oscillation concerning frequency
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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

Abstract

The application belongs to the field of active support control of photovoltaic power generation and photovoltaic grid-connected frequency, and relates to a transient frequency active support self-adaptive control method, a system and a device of a photovoltaic power station, wherein the method comprises the following steps: estimating the power shortage of the power system under the condition that the photovoltaic power station is connected into the power system by measuring the current frequency of the power system; and the adaptive regulation of the transient support power of each photovoltaic power station is realized through an adaptive law. Aiming at the problems that the traditional primary frequency modulation needs to detect the passivity of the large frequency difference and the time-varying property of the power-illumination coefficient in the photovoltaic model, the application respectively provides the advanced active adjustment and self-adaptive distribution scheme of the response power of the photovoltaic power station, so that the transient frequency response performance of the power system under the condition that the photovoltaic power station is connected with the power system can be effectively improved, and meanwhile, compared with the traditional primary frequency modulation, the self-adaptive scheme improves the active support control robustness, and reduces the adverse effect of the time-varying property of the power-illumination coefficient of the controlled model on the control effect, namely the frequency response performance.

Description

Photovoltaic power station transient frequency active support self-adaptive control method, system and device
Technical Field
The application belongs to the field of active support control of photovoltaic power generation and photovoltaic grid-connected frequency, and relates to an adaptive control method, a system and a device for active support of transient frequency of a photovoltaic power station.
Background
With the gradual increase of the photovoltaic permeability of the power system, the current safety and stability guidelines of the power system already require that the photovoltaic power station participate in the frequency adjustment of the power system. The method aims at researching the frequency adjustment problem of the photovoltaic power station participated power system, and particularly, the transient event that the active power of the source side drops greatly occurs in the new energy power system.
At present, the problem of participation in power system frequency adjustment of a photovoltaic power station is solved. First, existing studies have focused on active regulation of photovoltaic power plants under long-term small-range fluctuations of conventional loads, and have not been concerned much with the problem of transient frequency regulation of photovoltaic power plants in the event of transient events such as sudden changes in source-side light output. Secondly, the existing researches mostly neglect the time-varying problem of the self illumination-active conversion coefficient of the photovoltaic power station, approximate the time-varying problem to be constant processing, and the proposed active fixed distribution coefficient has poor robustness on the transient response performance of the power system.
Disclosure of Invention
In view of the above, the present application provides a photovoltaic power plant transient frequency active support adaptive control method, system, and apparatus that effectively solves or at least alleviates one or more of the above-identified problems and other problems of the prior art.
The purpose of the disclosure can be achieved by the following technical scheme:
according to one aspect of the application, there is provided a photovoltaic power station transient frequency active support adaptive control method, when a source side light active power output greatly suddenly drops transient event occurs in a power system, the control method comprises:
the power shortage level of the power system is estimated, active power distributed by each photovoltaic power station is supplemented to the power system, and the total amount of the active power distributed by each photovoltaic power station is similar to the power shortage of the power system;
and formulating an adaptive control strategy for the photovoltaic power stations participating in the power shortage supplement of the power system in the power system, and generating active power allocation coefficients of the photovoltaic power stations for correcting the active power allocated by the photovoltaic power stations by the adaptive control strategy.
Optionally, evaluating the power deficiency level of the power system is determined by a change in the power system frequency information.
Optionally, the evaluating the power deficiency level of the power system is determined by a change in the frequency information of the power system, including the steps of:
the quantitative relation function between the power change amount and the frequency offset amount of the power system is presented:
calculating the power deficiency level delta P of the power system under the condition of knowing the inertia time constant H and the damping coefficient D of the power system by monitoring the current frequency offset delta f of the power system;
the inertia time constant of the power system is estimated as follows:
wherein N and M are respectively the number of photovoltaic power stations and the number of synchronous generators, H i,PV Is the inertia time constant of the ith photovoltaic power station in the power system, S i,PV The installed capacity of the ith photovoltaic power station; h i,SG Is the inertia time constant of an ith synchronous generator in an electric power system, S i,SG Is the installed capacity of an i-th synchronous generator in the power system.
Alternatively, the active power split coefficient K for a photovoltaic power plant ci The acquisition of (1) comprises the steps of:
the following performance objective functions:
the self-adaptive rule of the power system can be obtained by using a gradient method as follows:
where η is the gradient descent coefficient of the reference model.
According to yet another aspect of the present application, there is provided a photovoltaic power plant transient frequency active support adaptive control system, when a source side light active power output large sudden drop transient event occurs in a power system, the control system comprising:
the processing module is used for: the power shortage level of the power system is estimated, active power distributed by each photovoltaic power station is supplemented to the power system, and the total amount of the active power distributed by each photovoltaic power station is similar to the power shortage of the power system;
and a correction module: and formulating an adaptive control strategy for the photovoltaic power stations participating in the power shortage supplement of the power system in the power system, and generating active power allocation coefficients of the photovoltaic power stations for correcting the active power allocated by the photovoltaic power stations by the adaptive control strategy.
Optionally, evaluating the power deficiency level of the power system is determined by a change in the power system frequency information.
Optionally, the evaluating the power deficiency level of the power system is determined by a change in the frequency information of the power system, including the steps of:
the quantitative relation function between the power change amount and the frequency offset amount of the power system is presented:
calculating the power deficiency level delta P of the power system under the condition of knowing the inertia time constant H and the damping coefficient D of the power system by monitoring the current frequency offset delta f of the power system;
the inertia time constant of the power system is estimated as follows:
wherein N and M are respectively the number of photovoltaic power stations and the number of synchronous generators, H i,PV Is the inertia time constant of the ith photovoltaic power station in the power system, S i,PV The installed capacity of the ith photovoltaic power station; h i,SG Is the inertia time constant of an ith synchronous generator in an electric power system, S i,SG Is the installed capacity of an i-th synchronous generator in the power system.
Alternatively, the active power split coefficient K for a photovoltaic power plant ci The acquisition of (1) comprises the steps of:
the following performance objective functions:
the self-adaptive rule of the power system can be obtained by using a gradient method as follows:
where η is the gradient descent coefficient of the reference model.
According to a further aspect of the application there is provided a photovoltaic power plant transient frequency active support adaptive control device, which in use generates a control method as hereinbefore described; or, the control device includes an execution program for executing the control system as described above.
The beneficial effects are that:
aiming at the problems that the traditional primary frequency modulation needs to detect the passivity of the large frequency difference and the time-varying property of the power-illumination coefficient in the photovoltaic model, the application respectively provides the advanced active adjustment and self-adaptive distribution scheme of the response power of the photovoltaic power station, so that the transient frequency response performance of the power system under the condition that the photovoltaic power station is connected with the power system can be effectively improved, and meanwhile, compared with the traditional primary frequency modulation, the self-adaptive scheme improves the active support control robustness, and reduces the adverse effect of the time-varying property of the power-illumination coefficient of the controlled model on the control effect, namely the frequency response performance.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the prior art, the drawings that are required for the description of the embodiments or the prior art will be briefly described, and it will be apparent to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a block diagram of a photovoltaic power plant model reference adaptive control in the present application;
FIG. 2 is a network topology according to an embodiment of the present application;
FIG. 3 is a graph illustrating exemplary frequency curves according to an embodiment of the present application;
fig. 4 is an alternative flow chart of an embodiment of the present application.
Detailed Description
First, it should be noted that the following description will be given by way of example to illustrate the components, the working principles, the characteristics and the advantages of the photovoltaic power plant transient frequency active support adaptive control method, system and device according to the present application, but it should be understood that all the descriptions are given only for illustration, and therefore should not be construed as limiting the present application in any way.
Furthermore, to any single technical feature described or implicit in the embodiments mentioned herein, or any single technical feature shown or implicit in the drawings, the application still allows any combination or deletion of any combination or deletion between these technical features (or their equivalents) to be continued without any technical obstacle, thereby obtaining still other embodiments of the application that may not be directly mentioned herein.
Embodiment one:
the transient frequency active support self-adaptive control method of the photovoltaic power station comprises the following steps:
monitoring frequency information of the power system at a power system measurement node;
estimating a power deficiency level of the power system according to the change of the frequency information of the power system;
for the power shortage level of the power system, a photovoltaic formulated model participating in adjustment is referenced with an adaptive control strategy, and the power given quantity of each photovoltaic power station and the active power allocation coefficient of each power station are adaptively generated;
the photovoltaic power station provides transient response power of the power system according to the power control instruction, namely the power given quantity and the existing power allocation coefficient.
Aiming at the steps, the application sets forth the specific implementation process of each step as follows:
a method for estimating a power system power deficit level.
After the frequency information of the power system measurement node is acquired, the power deficiency level of the power system is further calculated, and the estimation method of the power deficiency level of the power system can be presented according to a quantitative relation function between the power change amount and the frequency offset of the power system:
that is, by monitoring the current frequency offset Δf of the power system, the power deficiency level Δp of the power system is calculated with the inertia time constant H and the damping coefficient D of the power system known. For the method of obtaining H, in the case of determining the photovoltaic permeability in the electric power system, the inertia time constant of the electric power system can be estimated under the moment of inertia of the known synchronous machine as follows:
wherein N and M are respectively the number of photovoltaic power stations and the number of synchronous generators, H i,PV Is the inertia time constant of the ith photovoltaic power station in the power system, S i,PV The installed capacity of the ith photovoltaic power station; h i,SG Is the inertia time constant of an ith synchronous generator in an electric power system, S i,SG Is the installed capacity of an i-th synchronous generator in the power system. The inertial time constant of the power system can be estimated from this equation.
And designing a photovoltaic power station model after a transient event of the power system by referring to an adaptive control strategy.
After the power shortage level of the power system is obtained, the active set value of each photovoltaic power station in the power system is required to be reasonably distributed, and the randomness and the time-varying property of the equivalent power-illumination conversion coefficient N(s) of each photovoltaic power station during power point tracking are considered, so that the unknown parameters exist in the active power-frequency control model of the photovoltaic power station. In this regard, reference may be made to the model reference adaptive control concept, for example by introducing an adjustable power split coefficient K for two photovoltaic power stations ci (i＝1，2，…，n)，K ci For the ith stationActive power split coefficients. The self-adaptive mechanism is adopted to adjust the frequency response in real time, so that the output characteristic of the frequency response is that the actual frequency response is deltaf and the target frequency response is deltaf of the output characteristic of the transfer function of the target reference model m Under the approximate same condition, better transient response performance of the power system under the photovoltaic grid connection is realized, and the specific thinking is shown in the figure 1;
the meaning of the variable parameters is illustrated in fig. 1 as follows: t (T) PV Is the time constant of the photovoltaic power control loop, T 1 ～T n The communication time constant k sent to the inverter for the given value of the photovoltaic primary frequency modulation power 1 ～k n In the example, the frequency of the frequency modulation of n photovoltaic power stations, namely the primary frequency modulation sagging coefficient of active power, A is the photovoltaic permeability of the power system, R is the adjustment difference coefficient of a speed regulator of a synchronous machine of the power system, T is the power execution time constant of the synchronous machine, a is the equivalent transmission coefficient of a steam turbine, and H and D are the total equivalent inertia time constant and the equivalent damping coefficient of the power system respectively. ΔP ref1 ～ΔP refn Generating the respective active power given quantity of the n photovoltaic power stations after power allocation for model reference adaptive control correction by generating a total deficiency delta P for the estimation method in the prior reference formula (1) all And then apportioning.
Aiming at the problem of transient power deficiency caused by large-amplitude dip of illumination of a power system, a control strategy estimates the current power deficiency level delta P of the power system according to the power deficiency estimation method in (1) by detecting frequency variation information delta f all Then, the power given quantity which needs to be adjusted for the respective power can be calculated through the active power sharing coefficient of each power station. Secondly, consider the equivalent active power-illumination conversion coefficient N of each photovoltaic power station r (s) uncertainty and time-varying characteristics, to ensure accuracy of the result of a given amount of power applied by each station of the power system, a reference model can be introduced:
wherein N (s)/D(s) =Δf/Δp, K m To overcome N based on model reference self-adaptive control concept for referencing the proportionality coefficient of the power system r (s) unobservable, namely frequency modulation power given quantity delta P of each power station generated by the power system caused by random time variation, namely controlled object model parameter variation ref1 ～ΔP refn Lack of timeliness problems and need to be re-calibrated for deltap at each plant ref1 ～ΔP refn Thus introducing the power split coefficient K of each plant ci K of each power station is adjusted through self-adaptive mechanism ci Re-correcting the power set quantity of each power station to compensate N r (s) time-varying control accuracy problems, it can be achieved that the transient frequency response characteristic Δf of the actual power system is close to the target transient response characteristic Δf of the reference power system m For K ci The adaptive adjustment law determination method of (1) can select the following performance objective functions:
the self-adaptive rule of the power system can be obtained by using a gradient method as follows:
wherein eta is the gradient descent coefficient of the reference model and can be specified according to the requirement.
Particularly, when a transient event occurs in the power system, the quick response characteristic of the photovoltaic power station can be exerted, so that the emergency support of the power supply of the photovoltaic with load shedding standby is realized, and the transient response performance of the power system is improved. Therefore, on one hand, the advantage of rapidity of the photovoltaic power station participating in the frequency response of the power grid can be exerted, and the system still has better transient frequency response performance after the photovoltaic power station replaces the equivalent synchronous machine set for grid connection; on the other hand, the adaptive control method is adopted to flexibly change the active allocation coefficient of each photovoltaic power station, so that the performance robustness of the photovoltaic power station group on the transient frequency response of the system can be improved.
Embodiment two:
the photovoltaic power station transient frequency active support self-adaptive control system comprises the following control modules:
the processing module is used for: the power shortage level of the power system is estimated, active power distributed by each photovoltaic power station is supplemented to the power system, and the total amount of the active power distributed by each photovoltaic power station is similar to the power shortage of the power system;
and a correction module: and formulating an adaptive control strategy for the photovoltaic power stations participating in the power shortage supplement of the power system in the power system, and generating active power allocation coefficients of the photovoltaic power stations for correcting the active power allocated by the photovoltaic power stations by the adaptive control strategy. For how to implement, reference may be made to embodiment one. Therefore, the passive performance of the large frequency difference re-action and the time-varying problem of the power-illumination coefficient in the photovoltaic model can be detected when the unified frequency modulation is carried out, the advanced active adjustment and self-adaptive distribution scheme of the response power of the photovoltaic power station are respectively provided, the transient frequency response performance of the power system under the condition that the photovoltaic power station is connected with the power system can be effectively improved, meanwhile, compared with the traditional primary frequency modulation, the adopted self-adaptive scheme improves the active support control robustness, and the adverse effect of the time-varying of the power-illumination coefficient of the controlled model on the control effect, namely the frequency response performance, is reduced.
Embodiment III:
providing a photovoltaic power station transient frequency active support self-adaptive control device, wherein the control device generates a control method as in the first embodiment when in use; or, the control device includes an execution program for executing the control system according to the second embodiment; therefore, the passive performance of the large frequency difference re-action and the time-varying problem of the power-illumination coefficient in the photovoltaic model can be detected when the unified frequency modulation is carried out, the advanced active adjustment and self-adaptive distribution scheme of the response power of the photovoltaic power station are respectively provided, the transient frequency response performance of the power system under the condition that the photovoltaic power station is connected with the power system can be effectively improved, meanwhile, compared with the traditional primary frequency modulation, the adopted self-adaptive scheme improves the active support control robustness, and the adverse effect of the time-varying of the power-illumination coefficient of the controlled model on the control effect, namely the frequency response performance, is reduced.
According to the first embodiment, the second embodiment and the third embodiment, a transient frequency active support model under photovoltaic grid connection is studied, a self-adaptive control support strategy is referenced, and the load-shedding standby capacity of a photovoltaic power station is utilized to provide transient power support and frequency active support for a power system. The improvement of transient frequency response performance of the power system is realized, and the following five-machine two-area power system is taken as an example for explanation:
the power system of the embodiment in fig. 2 includes two source side generator clusters, region 1 is defined by 2 synchronous generator sets: SG1, SG2, as synchronous power source of the power system, zone 2 is mainly composed of three photovoltaic power stations: PV1, PV2 and PV 3. Each power station comprises a plurality of photovoltaic arrays to finish centralized grid connection. Transient events of the reduction of active power are sent out from the area 2 by simulating the large sudden drop of the illumination of the PV1, active standby of SG1, SG2, PV2 and PV3 are simultaneously provided, the active standby of four can be utilized to provide transient power active support for a power system by adopting model reference adaptive control according to the second step, and the frequency modulation response time constants of two photovoltaic power stations are respectively T 1 And T 2 。
Based on the selected parameter conditions of fig. 2, the power system main equivalent parameter selections are as follows:
TABLE 1 Main control parameter selection results for Power System
Based on the main data, the light intensity is changed from 1000W/m by simulating the PV1 side light intensity 2 Greatly reduce to 200W/m 2 According to the measured illumination variation, generating an active given value sequence of each power station according to the model reference adaptive controller, and analyzing the frequency transient response condition of the power system.
By selecting different control strategies, the following are respectively marked:
(1) model reference adaptive control for changing power division of each power stationSpreading factor K ci Correcting and distributing active control set values of SG1, SG2, PV1, PV2 and PV3 to realize rapid active support of transient power of a power system;
(2) active output of SG1, SG2, PV1, PV2 and PV3 is adjusted by inertia control to realize passive support of transient power of the power system;
(3) only inertia control is adopted to passively regulate the output of the synchronous machines SG1 and SG2, and the photovoltaic is not transformed according to the flexible and adjustable resource of the power system, and does not participate in transient response; as shown in fig. 3;
by comparing the results formed by different control modes, it can be seen that better transient frequency response performance of the power system can be achieved by adjusting the photovoltaic output by adopting model reference adaptive control, meanwhile, compared with a common virtual inertia control means such as photovoltaic, the method of taking output adjustment action after detecting frequency change has better transient response performance, and meanwhile, compared with the situation that the standby photovoltaic does not participate in transient response of the power system at all, the provided model reference adaptive method has more obvious effect on improving frequency.
The above examples mainly illustrate the feeding mechanism of the magnet steel inserting machine, the inserting mechanism and the magnet steel inserting machine. Although only a few embodiments of the present application have been described, those skilled in the art will appreciate that the present application can be embodied in many other forms without departing from the spirit or scope thereof. Accordingly, the present examples and embodiments are to be considered as illustrative and not restrictive, and the application is intended to cover various modifications and substitutions without departing from the spirit and scope of the application as defined by the appended claims.

Claims (3)

1. The self-adaptive control method for the active support of the transient frequency of the photovoltaic power station is characterized by comprising the following steps of:
the power shortage level of the power system is estimated, active power distributed by each photovoltaic power station is supplemented to the power system, and the total amount of the active power distributed by each photovoltaic power station is similar to the power shortage of the power system;
making an adaptive control strategy for photovoltaic power stations participating in power shortage replenishment of the power system in the power system, and generating active power allocation coefficients of the photovoltaic power stations by the photovoltaic power stations participating in power shortage replenishment of the power system through the adaptive control strategy, wherein the active power allocation coefficients are used for correcting active power allocated by the photovoltaic power stations;
evaluating the power deficiency level of the power system and judging through the change of the frequency information of the power system;
evaluating the power deficiency level of the power system to distinguish through the change of the frequency information of the power system, comprising the following steps:
the quantitative relation function between the power change amount and the frequency offset amount of the power system is presented:
calculating the power deficiency level delta P of the power system under the condition of knowing the inertia time constant H and the damping coefficient D of the power system by monitoring the current frequency offset delta f of the power system;
the inertia time constant of the power system is estimated as follows:
wherein N and M are respectively the number of photovoltaic power stations and the number of synchronous generators, H i,PV Is the inertia time constant of the ith photovoltaic power station in the power system, S i,PV The installed capacity of the ith photovoltaic power station; h i,SG Is the inertia time constant of an ith synchronous generator in an electric power system, S i,SG The installed capacity of an ith synchronous generator in the power system;
active power split coefficient K for photovoltaic power station ci The acquisition of (1) comprises the steps of:
the following performance objective functions:
the self-adaptive rule of the power system can be obtained by using a gradient method as follows:
where η is the gradient descent coefficient of the reference model.
2. The photovoltaic power station transient frequency active support self-adaptive control system is characterized in that when a source side photovoltaic active power output greatly drops transient event in a power system, the control system comprises the following modules:
the processing module is used for: the power shortage level of the power system is estimated, active power distributed by each photovoltaic power station is supplemented to the power system, and the total amount of the active power distributed by each photovoltaic power station is similar to the power shortage of the power system;
and a correction module: making an adaptive control strategy for photovoltaic power stations participating in power shortage replenishment of the power system in the power system, and generating active power allocation coefficients of the photovoltaic power stations by the photovoltaic power stations participating in power shortage replenishment of the power system through the adaptive control strategy, wherein the active power allocation coefficients are used for correcting active power allocated by the photovoltaic power stations;
evaluating the power deficiency level of the power system and judging through the change of the frequency information of the power system;
evaluating the power deficiency level of the power system to distinguish through the change of the frequency information of the power system, comprising the following steps:
the quantitative relation function between the power change amount and the frequency offset amount of the power system is presented:
calculating the power deficiency level delta P of the power system under the condition of knowing the inertia time constant H and the damping coefficient D of the power system by monitoring the current frequency offset delta f of the power system;
the inertia time constant of the power system is estimated as follows:
wherein N and M are respectively the number of photovoltaic power stations and the number of synchronous generators, H i,PV Is the inertia time constant of the ith photovoltaic power station in the power system, S i,PV The installed capacity of the ith photovoltaic power station; h i,SG Is the inertia time constant of an ith synchronous generator in an electric power system, S i,SG The installed capacity of an ith synchronous generator in the power system;
active power split coefficient K for photovoltaic power station ci The acquisition of (1) comprises the steps of:
the following performance objective functions:
the self-adaptive rule of the power system can be obtained by using a gradient method as follows:
where η is the gradient descent coefficient of the reference model.
3. An active support self-adaptive control device for transient frequency of a photovoltaic power station, which is characterized in that the control device generates the control method according to claim 1 when in use; or, the control device includes an execution program for executing the control system according to claim 2.
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CN108123438A (en) * 2017-12-29 2018-06-05 国家电网公司华中分部 A kind of mains frequency situation on-line prediction method for considering wind-powered electricity generation and energy storage
CN110198039A (en) * 2019-06-10 2019-09-03 东南大学 Reply high proportion grid-connected photo-thermal power station Optimization Modeling and operation method
CN112542845A (en) * 2020-11-30 2021-03-23 国网浙江省电力有限公司电力科学研究院 Energy storage power station participating peak regulation control method considering frequency support capability
CN112701698A (en) * 2020-12-22 2021-04-23 国网电力科学研究院有限公司 Fan transient frequency active supporting method and system for dealing with power grid fault and storage medium

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108123438A (en) * 2017-12-29 2018-06-05 国家电网公司华中分部 A kind of mains frequency situation on-line prediction method for considering wind-powered electricity generation and energy storage
CN110198039A (en) * 2019-06-10 2019-09-03 东南大学 Reply high proportion grid-connected photo-thermal power station Optimization Modeling and operation method
CN112542845A (en) * 2020-11-30 2021-03-23 国网浙江省电力有限公司电力科学研究院 Energy storage power station participating peak regulation control method considering frequency support capability
CN112701698A (en) * 2020-12-22 2021-04-23 国网电力科学研究院有限公司 Fan transient frequency active supporting method and system for dealing with power grid fault and storage medium

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