CN116742699A - Wind-solar energy storage station centralized frequency modulation control method and system considering power grid frequency characteristics - Google Patents
Wind-solar energy storage station centralized frequency modulation control method and system considering power grid frequency characteristics Download PDFInfo
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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
- H02J3/381—Dispersed generators
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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
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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
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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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
- 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
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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
- 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
- H02J2300/28—The renewable source being wind energy
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
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Abstract
The method and the system for controlling the centralized frequency modulation of the wind-solar energy storage station consider the frequency characteristic of the power grid, and decompose the calculated primary frequency modulation power instruction into a low-frequency power component and a high-frequency power component when the frequency change rate crosses a frequency change rate dead zone and the frequency deviation crosses a frequency deviation dead zone; according to the frequency deviation direction and the frequency change trend, four scenes of wind-solar energy storage frequency adjustment are determined according to the stored energy SOC state information; and determining the energy storage primary frequency modulation instruction and the wind-light primary frequency modulation instruction in various scenes according to the primary frequency modulation power instruction, the energy storage adjustable power and the wind-light adjustable power. According to the application, energy storage regulation is preferentially utilized during power reduction frequency modulation, and wind and light energy storage response speed is combined during power increase regulation according to the system frequency change trend, wind and light energy storage with small disturbance is preferentially regulated, energy storage with large disturbance is used for carrying out short-time rapid power response, and wind and light energy carries out long-time power support.
Description
Technical Field
The application belongs to the technical field of new energy grid-connected operation and control, and particularly relates to a centralized frequency modulation control method and system for a wind-solar storage station considering the frequency characteristic of a power grid.
Background
The participation of new energy in the power grid frequency regulation is an important measure for promoting the consumption of new energy and improving the frequency stability of the high-proportion new energy power grid. Considering the rapidity requirement of primary frequency modulation, the primary frequency modulation control method is different for the wind-solar new energy station with distributed and centralized control. For the wind-solar new energy station with centralized control and close space distribution characteristics, the stations have the conditions of centralized control and joint frequency modulation, the regulation advantages of various resources are fully exerted, and the wind-solar new energy station has important significance for promoting new energy consumption, reducing the wind-discarding light-discarding rate and promoting the system to run economically and stably.
The wind power plant and the photovoltaic power station adopt a mode of maximum power operation, do not have the capability of upward adjustment (namely power rising frequency modulation), and the prior art generally adopts a mode of load shedding reservation to provide margin for upward adjustment, so that the capability of the system for coping with frequency disturbance risks is improved, the wind and light rejection rate is improved at the same time, and the economic operation of the system is not facilitated. The energy storage has the capacity of bidirectional regulation, so that the contradiction between the maximization of wind and light resource utilization and the lack of upward regulation can be effectively solved, and the regulation capacity of the energy storage is fully utilized to become a new direction for solving the problems. In the prior art, in view of economy, the energy storage is used for preferentially carrying out frequency modulation and wind-light auxiliary frequency modulation, and the reserved power of wind light can be effectively reduced, but the frequency modulation capability of wind light is not fully exerted; from the viewpoint of improving the frequency stability of the system, the energy storage is utilized to carry out quick virtual inertia support in a short time scale, the wind and light bears primary frequency modulation control in a long time scale, the sustainable support of the wind and light and the capability of quick response of the energy storage are fully exerted, but the frequency modulation capability of the energy storage is not fully exerted, and the important significance of promoting new energy consumption when the frequency is adjusted upwards is ignored. Therefore, in the prior art, the wind-discarding rate is increased due to wind-light power reduction frequency modulation, and the problem that wind-light regulation capability is not fully utilized restricts new energy consumption.
Disclosure of Invention
In order to solve the defects in the prior art, the application provides a centralized frequency modulation control method and system for a wind-solar energy storage station, which take the frequency characteristic of a power grid into consideration, wherein energy storage adjustment is preferentially utilized during power reduction and frequency modulation, response speed of wind-solar energy storage is combined during power rising adjustment according to the frequency change trend of a system, wind-solar energy with small disturbance is preferentially adjusted, short-time and rapid power response is carried out by large disturbance energy storage, and long-time scale power support is carried out by wind-solar energy.
The application adopts the following technical scheme.
The application provides a centralized frequency modulation control method for a wind-solar energy storage station in consideration of power grid frequency characteristics, which comprises the following steps:
step 1, collecting operation data of a wind-solar storage station and frequency data of a grid-connected point;
step 2, when the frequency change rate exceeds the frequency change rate dead zone and the frequency deviation exceeds the frequency deviation dead zone, decomposing the calculated primary frequency modulation power instruction into a low-frequency power component and a high-frequency power component; otherwise, returning to the step 1;
step 3, when the frequency deviation direction is the positive direction, if the energy storage is judged to be in a charging permission state according to the SOC state information of the energy storage, a first scene of wind-solar energy storage frequency adjustment is formed; if the energy storage is judged to be in a non-charging permission state, a second scene of wind-solar energy storage frequency adjustment is formed;
when the frequency deviation direction is a negative direction, if the energy storage is judged to be in a non-discharge allowable state according to the SOC state information of the energy storage, a second scene of wind-solar energy storage frequency adjustment is formed; if the energy storage is judged to be in a discharge permission state, judging whether the energy storage can participate in frequency adjustment according to the trend of the frequency change, including:
when the frequency is in the deterioration stage, a third scene of wind-solar energy storage frequency adjustment is formed; and the energy storage bears the fast-changing high-frequency power component, and the wind and light bears the slow-changing low-frequency power component;
when the frequency is in the recovery stage, a fourth scene of wind-solar energy storage frequency adjustment is formed;
and 4, determining an energy storage primary frequency modulation instruction and a wind-light primary frequency modulation instruction in various scenes according to the primary frequency modulation power instruction, the energy storage adjustable power and the wind-light adjustable power.
Preferably, in step 2, the calculated primary frequency modulation power command is decomposed into a low frequency power component and a high frequency power component by a first-order low-pass filtering link.
Preferably, in step 3, the frequency deviation direction is determined by the difference between the frequency acquired in real time and the rated frequency, wherein the difference is positive and indicates the frequency deviation direction as positive, whereas the difference is negative and indicates the frequency deviation direction as negative.
Preferably, in step 3, when the stored SOC is between (SOC min ，SOC max ) During the time, the energy storage is allowed to be charged and discharged; SOC is between (0, SOC) min ) During the time, the energy storage discharge is forbidden, and the charge is allowed; SOC between (SOC) max In between 1), energy storage and chargingInhibit, discharge enable.
Preferably, in step 3, the trend of the frequency variation is determined by the product of the frequency deviation and the frequency derivative, and the frequency is in the deterioration stage when the product is positive, and in the recovery stage when the product is negative.
Preferably, in the first scenario, when the energy storage adjustable power is not less than the primary frequency modulation power instruction, the primary frequency modulation power instruction is used as the energy storage primary frequency modulation instruction;
in a first scenario, when the energy storage adjustable power is smaller than the primary frequency modulation power instruction, the energy storage primary frequency modulation instruction is the output maximum power, and the difference value between the primary frequency modulation power instruction and the energy storage primary frequency modulation instruction is born by wind-light equipment.
Preferably, in the second scenario, the primary frequency modulation power command is used as a wind-light primary frequency modulation command, and the energy storage primary frequency modulation command is 0.
Preferably, in the third scenario, the high-frequency power component in the primary frequency modulation power instruction is used as an energy storage primary frequency modulation instruction, and the low-frequency power component is used as a wind-light primary frequency modulation instruction.
Preferably, in the fourth scenario, when the wind-solar adjustable power is not less than the primary frequency modulation power instruction, the primary frequency modulation power instruction is used as a wind-solar primary frequency modulation instruction, and the energy storage primary frequency modulation instruction is 0;
in a fourth scenario, when the wind-solar adjustable power is smaller than the primary frequency modulation power command, the wind-solar primary frequency modulation command is output maximum power, and the difference value between the primary frequency modulation power command and the wind-solar primary frequency modulation command is borne by energy storage.
The application also provides a wind-solar energy storage station centralized frequency modulation control system considering the frequency characteristic of the power grid, which comprises the following steps: the system comprises an acquisition module, an instruction decomposition module, a scene judgment module and an instruction generation module;
the acquisition module is used for acquiring the operation data of the wind-solar storage station and the frequency data of the grid-connected point;
the instruction decomposition module is used for decomposing the calculated primary frequency modulation power instruction into a low-frequency power component and a high-frequency power component when the frequency change rate exceeds the frequency change rate dead zone and the frequency deviation exceeds the frequency deviation dead zone;
the scene judging module is used for judging that the stored energy is in a charging permission state according to the SOC state information of the stored energy when the frequency deviation direction is in a positive direction, and forming a first scene of wind-solar energy storage frequency adjustment; if the energy storage is judged to be in a non-charging permission state, a second scene of wind-solar energy storage frequency adjustment is formed; when the frequency deviation direction is a negative direction, if the energy storage is judged to be in a non-discharge allowable state according to the SOC state information of the energy storage, a second scene of wind-solar energy storage frequency adjustment is formed; if the energy storage is judged to be in a discharge permission state, judging whether the energy storage can participate in frequency adjustment according to the trend of the frequency change, including: when the frequency is in the deterioration stage, a third scene of wind-solar energy storage frequency adjustment is formed; and the energy storage bears the fast-changing high-frequency power component, and the wind and light bears the slow-changing low-frequency power component; when the frequency is in the recovery stage, a fourth scene of wind-solar energy storage frequency adjustment is formed;
the instruction generation module is used for determining the energy storage primary frequency modulation instruction and the wind-light primary frequency modulation instruction in various scenes according to the primary frequency modulation power instruction, the energy storage adjustable power and the wind-light adjustable power.
Compared with the prior art, the method provided by the application comprehensively considers the economy and stability of wind and solar energy storage frequency modulation, and reduces the wind and light rejection rate from two dimensions by distinguishing the power-up frequency modulation and the power-down frequency modulation. When the power is increased to regulate the frequency, the wind-light field station is preferentially regulated, so that wind-light resource waste caused by reserved power is reduced; when the power is reduced and the frequency is modulated, the energy storage is preferentially regulated, the maximization of the output power of the wind-light field station is ensured as much as possible, and the method has important significance for improving the economy of wind-light energy storage and frequency modulation.
In addition, the energy storage is preferentially regulated in the power reduction stage, so that the speed of system power response can be ensured, and the overall response speed is slower than that of the energy storage due to the preferential regulation of the wind-solar field station in the power increase process, and the distributed power is refined by considering the trend of frequency change in order to ensure the stability of the frequency. Under small disturbance, the wind-light field station is preferentially adjusted, so that the frequency modulation capability of wind light can be fully exerted, and wind-light absorption can be promoted; under the large disturbance, the energy storage is utilized to perform quick response, the system frequency is effectively supported by virtual inertia, the falling speed of the system frequency is reduced, and the effective time is striven for the frequency adjustment of the wind-solar field station.
Drawings
FIG. 1 is a flow chart of a centralized frequency modulation control method for a wind-solar energy storage station, which is provided by the application and takes the frequency characteristic of a power grid into consideration;
FIG. 2 is a diagram of a centralized control system for a wind farm in accordance with an embodiment of the present application;
FIG. 3 is a logic diagram of four scenario judgment logic for wind light storage frequency adjustment in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. The described embodiments of the application are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art without inventive faculty, are within the scope of the application, based on the spirit of the application.
The application provides a centralized frequency modulation control method of a wind-solar energy storage station considering the frequency characteristic of a power grid, which is shown in figure 1 and comprises the following steps:
and step 1, collecting operation data of the wind-solar storage station and frequency data of the grid-connected point.
As shown in fig. 2, the centralized controller in the wind-light storage station is used for collecting the operation data of the wind-light storage station and the frequency data of the grid-connected point.
Specifically, the collected operational data of the wind and solar energy storage station includes, but is not limited to: real-time power and reserved power of a wind power plant and a photovoltaic station, rated power of an energy storage station, real-time power, state of charge (SOC) state information and upper and lower limits of SOC; the frequency data of the point of presence includes, but is not limited to: system real time frequency.
The system frequency change rate is calculated and is the ratio of the difference of the system frequency in the sampling time interval to the sampling time interval.
Step 2, when the frequency change rate exceeds the frequency change rate dead zone and the frequency deviation exceeds the frequency deviation dead zone, decomposing the calculated primary frequency modulation power instruction into a low frequency power component and a high frequency power component; otherwise, returning to the step 1.
Specifically, in a non-limiting preferred embodiment, the primary frequency modulation dead zone of the wind power plant is set between +/-0.03 Hz and +/-0.1 Hz, and the primary frequency modulation dead zone of the photovoltaic field station is set between +/-0.02 Hz and +/-0.06 Hz, and the frequency change rate dead zone and the frequency deviation dead zone are specifically determined according to the primary frequency modulation combined power grid operation requirement.
Specifically, primary frequency modulation power is calculated according to pre-designed parameters and sampling information, as follows:
in the method, in the process of the application,
P ref for primary frequency modulated power commands, specifically power target commands of the central control station calculated by the cooperative controller,
Δt is the sampling time interval of the time,
k a for the primary frequency modulation sag factor,
k b is a virtual inertia support coefficient, and is a virtual inertia support coefficient,
Δf is the difference between the frequency acquired in real time and the nominal frequency.
In a non-limiting preferred embodiment, after the primary frequency modulation power command is calculated, the fast and slow components in the primary frequency modulation power command are decomposed through a first-order low-pass filtering link, so as to distinguish short-time impact components, and the short-time impact components are borne by energy storage as much as possible.
The fast and slow power component decomposition is realized through a first-order low-pass filtering link, as follows:
wherein P is l For low frequency power component, P h T is the high frequency power component S Is the time constant of the first order low pass filter used for fast and slow power component decomposition.
And 3, determining four scenes of wind-solar energy storage frequency adjustment according to the energy storage SOC state information when the frequency deviation direction and the frequency change trend are adopted.
Specifically, as shown in fig. 3, step 3 includes:
when the frequency deviation direction is the positive direction, if the energy storage is judged to be in a charging permission state according to the SOC state information of the energy storage, a first scene of wind-solar energy storage frequency adjustment is formed; and if the energy storage is judged to be in a non-charging permission state, a second scene of wind and light energy storage frequency adjustment is formed.
The frequency deviation direction is judged by the difference value delta f between the frequency acquired in real time and the rated frequency. When the difference is positive (Δf > 0), that is, the frequency acquired in real time exceeds the rated frequency, the frequency deviation direction is indicated as positive, whereas when the difference is negative (Δf < 0), the frequency deviation direction is indicated as negative.
Specifically, when the SOC of the stored energy is between (SOC min ，SOC max ) During the time, the energy storage is allowed to be charged and discharged; SOC is between (0, SOC) min ) During the time, the energy storage discharge is forbidden, and the charge is allowed; SOC between (SOC) max And 1), during the period, the energy storage charge is forbidden, and the discharge is allowed.
When the frequency deviation direction is a negative direction, if the energy storage is judged to be in a non-discharge allowable state according to the SOC state information of the energy storage, a second scene of wind-solar energy storage frequency adjustment is formed; if the energy storage is judged to be in a discharge permission state, judging whether the energy storage can participate in frequency adjustment according to the trend of the frequency change, including:
when the frequency is in the deterioration stage, a third scene of wind-solar energy storage frequency adjustment is formed; and the energy storage bears the fast-changing high-frequency power component, and the wind and light bears the slow-changing low-frequency power component;
when the frequency is in the recovery stage, a fourth scene of wind-solar energy storage frequency adjustment is formed;
the trend of the frequency change is judged by the product of the frequency deviation delta f and the frequency derivative df/dt, and when the product is positive, the frequency is in a deterioration stage, and otherwise, the frequency is in a recovery stage.
According to the scheme provided by the application, primary frequency modulation power distribution is carried out according to the direction of frequency change and the trend of frequency change and the principle that wind and light are main and energy storage is auxiliary during power rising frequency modulation and energy storage is main and wind and light is auxiliary during power falling frequency modulation.
In the method provided by the application, when the primary frequency modulation instruction is decomposed quickly and slowly for frequency up regulation, in the frequency deterioration stage, the energy storage bears a fast-changing high-frequency power component, and the wind and light bears a slow-changing low-frequency power component, so that the advantage of fast discharge of the energy storage is fully utilized, and the primary frequency modulation power support with long time scale can be effectively provided.
Step 4, determining an energy storage primary frequency modulation instruction and a wind-light primary frequency modulation instruction in four scenes according to the primary frequency modulation power instruction, the energy storage adjustable power and the wind-light adjustable power;
specifically, step 4 includes:
in the first scenario, when the energy storage adjustable power is not less than the primary frequency modulation power instruction, the primary frequency modulation power instruction is used as an energy storage primary frequency modulation instruction, namely all frequency modulation power is borne by the energy storage, as follows:
in a first scenario, when the energy storage adjustable power is smaller than the primary frequency modulation power instruction, the energy storage primary frequency modulation instruction is the output maximum power, and the difference value between the primary frequency modulation power instruction and the energy storage primary frequency modulation instruction is born by wind-light equipment.
Further, the wind-solar device bears the difference value between the primary frequency modulation instruction and the energy storage primary frequency modulation instruction according to the corresponding adjustable power proportion, as follows:
in the method, in the process of the application,
P BT for the energy-storage primary frequency modulation instruction,
P W is a primary frequency modulation instruction of the wind power plant,
P PV is a primary frequency modulation instruction of the photovoltaic field station,
P ref for a primary frequency modulated power command,
ΔP PV for the adjustable power of the photovoltaic field station,
ΔP W for the adjustable power of a wind farm,
P BT(max) and outputting maximum power for energy storage.
In the second scenario, the primary frequency modulation power instruction is used as a wind-light primary frequency modulation instruction, namely, all frequency modulation power is borne by wind light, the energy storage primary frequency modulation instruction is 0, and wind-light equipment bears the primary frequency modulation power instruction according to the corresponding adjustable power proportion, as follows:
in a third scenario, a high-frequency power component in the primary frequency modulation power instruction is used as an energy storage primary frequency modulation instruction, a low-frequency power component is used as a wind-light primary frequency modulation instruction, and wind-light equipment bears the low-frequency power component according to a corresponding adjustable power proportion as follows:
in a fourth scenario, when the wind-solar adjustable power is not less than the primary frequency modulation power command, the primary frequency modulation power command is used as a wind-solar primary frequency modulation command, and the energy storage primary frequency modulation command is 0, namely all frequency modulation power is borne by wind-solar equipment according to the corresponding adjustable power proportion, as follows:
in a fourth scenario, when the wind-solar adjustable power is smaller than the primary frequency modulation power command, the wind-solar primary frequency modulation command is the output maximum power, and the difference between the primary frequency modulation power command and the wind-solar primary frequency modulation command is borne by energy storage, as follows:
the method provided by the application comprehensively considers the economy and stability of wind and light storage frequency modulation, and reduces the wind and light rejection rate from two dimensions by distinguishing the power-up frequency modulation and the power-down frequency modulation.
When the power is increased and the frequency is modulated, the wind-light field station is preferentially regulated, the reserved power of wind light is guaranteed to be utilized as much as possible, the utilization rate of wind energy and light energy is effectively improved, wind-light resource waste caused by reserved power is reduced, and the wind-light discarding rate is reduced. When the power is reduced and the frequency is modulated, the energy storage is preferentially regulated, the maximization of the output power of the wind-light field station is ensured as much as possible, and the method has important significance for improving the economy of wind-light energy storage and frequency modulation. In the frequency deterioration stage, the impact variable of a short time scale is responded by taking advantage of the energy storage fast charge and fast discharge into consideration, and the wind and light bears the continuous response of a long time scale.
The application also provides a wind-solar energy storage station centralized frequency modulation control system considering the frequency characteristic of the power grid, which comprises the following steps: the system comprises an acquisition module, an instruction decomposition module, a scene judgment module and an instruction generation module;
the acquisition module is used for acquiring the operation data of the wind-solar storage station and the frequency data of the grid-connected point;
the instruction decomposition module is used for decomposing the calculated primary frequency modulation power instruction into a low-frequency power component and a high-frequency power component when the frequency change rate exceeds the frequency change rate dead zone and the frequency deviation exceeds the frequency deviation dead zone;
the scene judging module is used for judging that the stored energy is in a charging permission state according to the SOC state information of the stored energy when the frequency deviation direction is in a positive direction, and forming a first scene of wind-solar energy storage frequency adjustment; if the energy storage is judged to be in a non-charging permission state, a second scene of wind-solar energy storage frequency adjustment is formed; when the frequency deviation direction is a negative direction, if the energy storage is judged to be in a non-discharge allowable state according to the SOC state information of the energy storage, a second scene of wind-solar energy storage frequency adjustment is formed; if the energy storage is judged to be in a discharge permission state, judging whether the energy storage can participate in frequency adjustment according to the trend of the frequency change, including: when the frequency is in the deterioration stage, a third scene of wind-solar energy storage frequency adjustment is formed; and the energy storage bears the fast-changing high-frequency power component, and the wind and light bears the slow-changing low-frequency power component; when the frequency is in the recovery stage, a fourth scene of wind-solar energy storage frequency adjustment is formed;
the instruction generation module is used for determining the energy storage primary frequency modulation instruction and the wind-light primary frequency modulation instruction in various scenes according to the primary frequency modulation power instruction, the energy storage adjustable power and the wind-light adjustable power.
The application comprehensively considers the economy and stability of wind and light energy storage frequency modulation, and provides that wind and light are the main and energy storage are the auxiliary when in upward adjustment (power rising frequency modulation); when the power is adjusted downwards (power-reducing frequency modulation), the primary frequency modulation mode with energy storage as a main mode and wind and light as an auxiliary mode is adopted, the difference of wind and light storage response speeds is fully considered, the power-increasing frequency modulation is finely distinguished, different power distribution schemes are implemented through judging the frequency change trend, the quick response capacity of the energy storage is fully exerted, and the long-time scale supporting capacity of wind and light can be fully utilized.
The present disclosure may be a system, method, and/or computer program product. The computer program product may include a computer readable storage medium having computer readable program instructions embodied thereon for causing a processor to implement aspects of the present disclosure.
The computer readable storage medium may be a tangible device that can hold and store instructions for use by an instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: portable computer disks, hard disks, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static Random Access Memory (SRAM), portable compact disk read-only memory (CD-ROM), digital Versatile Disks (DVD), memory sticks, floppy disks, mechanical coding devices, punch cards or in-groove structures such as punch cards or grooves having instructions stored thereon, and any suitable combination of the foregoing. Computer-readable storage media, as used herein, are not to be construed as transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., optical pulses through fiber optic cables), or electrical signals transmitted through wires.
The computer readable program instructions described herein may be downloaded from a computer readable storage medium to a respective computing/processing device or to an external computer or external storage device over a network, such as the internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmissions, wireless transmissions, routers, firewalls, switches, gateway computers and/or edge servers. The network interface card or network interface in each computing/processing device receives computer readable program instructions from the network and forwards the computer readable program instructions for storage in a computer readable storage medium in the respective computing/processing device.
Computer program instructions for performing the operations of the present disclosure can be assembly instructions, instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, c++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer readable program instructions may be executed entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider). In some embodiments, aspects of the present disclosure are implemented by personalizing electronic circuitry, such as programmable logic circuitry, field Programmable Gate Arrays (FPGAs), or Programmable Logic Arrays (PLAs), with state information of computer readable program instructions, which can execute the computer readable program instructions.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made to the specific embodiments of the application without departing from the spirit and scope of the application, which is intended to be covered by the claims.
Claims (10)
1. The utility model provides a wind-solar energy storage station centralized frequency modulation control method considering the frequency characteristic of a power grid, which is characterized by comprising the following steps:
step 1, collecting operation data of a wind-solar storage station and frequency data of a grid-connected point;
step 2, when the frequency change rate exceeds the frequency change rate dead zone and the frequency deviation exceeds the frequency deviation dead zone, decomposing the calculated primary frequency modulation power instruction into a low-frequency power component and a high-frequency power component; otherwise, returning to the step 1;
step 3, when the frequency deviation direction is the positive direction, if the energy storage is judged to be in a charging permission state according to the SOC state information of the energy storage, a first scene of wind-solar energy storage frequency adjustment is formed; if the energy storage is judged to be in a non-charging permission state, a second scene of wind-solar energy storage frequency adjustment is formed;
when the frequency deviation direction is a negative direction, if the energy storage is judged to be in a non-discharge allowable state according to the SOC state information of the energy storage, a second scene of wind-solar energy storage frequency adjustment is formed; if the energy storage is judged to be in a discharge permission state, judging whether the energy storage can participate in frequency adjustment according to the trend of the frequency change, including:
when the frequency is in the deterioration stage, a third scene of wind-solar energy storage frequency adjustment is formed; and the energy storage bears the fast-changing high-frequency power component, and the wind and light bears the slow-changing low-frequency power component;
when the frequency is in the recovery stage, a fourth scene of wind-solar energy storage frequency adjustment is formed;
and 4, determining an energy storage primary frequency modulation instruction and a wind-light primary frequency modulation instruction in various scenes according to the primary frequency modulation power instruction, the energy storage adjustable power and the wind-light adjustable power.
2. The method for centralized frequency modulation control of a wind-solar energy storage station taking into account the frequency characteristics of a power grid as set forth in claim 1, wherein,
in step 2, the primary frequency modulation power instruction obtained through calculation is decomposed into a low-frequency power component and a high-frequency power component through a first-order low-pass filtering link.
3. The method for centralized frequency modulation control of a wind-solar energy storage station taking into account the frequency characteristics of a power grid as set forth in claim 1, wherein,
in step 3, the frequency deviation direction is determined by the difference value between the frequency acquired in real time and the rated frequency, wherein the difference value is positive and indicates that the frequency deviation direction is positive, otherwise, the difference value is negative and indicates that the frequency deviation direction is negative.
4. The method for centralized frequency modulation control of a wind-solar energy storage station taking into account the frequency characteristics of a power grid as set forth in claim 1, wherein,
in step 3, when the stored SOC is between (SOC min ，SOC max ) During the time, the energy storage is allowed to be charged and discharged; SOC is between (0, SOC) min ) During the time, the energy storage discharge is forbidden, and the charge is allowed; SOC between (SOC) max And 1), during the period, the energy storage charge is forbidden, and the discharge is allowed.
5. The method for centralized frequency modulation control of a wind-solar energy storage station taking into account the frequency characteristics of a power grid as set forth in claim 1, wherein,
in step 3, the trend of the frequency variation is judged by the product of the frequency deviation and the frequency derivative, and when the product is positive, the frequency is in a deterioration stage, otherwise, the frequency is in a recovery stage.
6. The method for centralized frequency modulation control of a wind-solar energy storage station taking into account the frequency characteristics of a power grid as set forth in claim 1, wherein,
in a first scene, when the energy storage adjustable power is not smaller than the primary frequency modulation power instruction, the primary frequency modulation power instruction is used as an energy storage primary frequency modulation instruction;
in a first scenario, when the energy storage adjustable power is smaller than the primary frequency modulation power instruction, the energy storage primary frequency modulation instruction is the output maximum power, and the difference value between the primary frequency modulation power instruction and the energy storage primary frequency modulation instruction is born by wind-light equipment.
7. The method for centralized frequency modulation control of a wind-solar energy storage station taking into account the frequency characteristics of a power grid as set forth in claim 1, wherein,
in a second scene, the primary frequency modulation power instruction is used as a wind and light primary frequency modulation instruction, and the energy storage primary frequency modulation instruction is 0.
8. The method for centralized frequency modulation control of a wind-solar energy storage station taking into account the frequency characteristics of a power grid as set forth in claim 1, wherein,
in a third scenario, a high-frequency power component in the primary frequency modulation power instruction is used as an energy storage primary frequency modulation instruction, and a low-frequency power component is used as a wind-light primary frequency modulation instruction.
9. The method for centralized frequency modulation control of a wind-solar energy storage station taking into account the frequency characteristics of a power grid as set forth in claim 1, wherein,
in a fourth scene, when the wind and light adjustable power is not smaller than the primary frequency modulation power instruction, the primary frequency modulation power instruction is used as a wind and light primary frequency modulation instruction, and the energy storage primary frequency modulation instruction is 0;
in a fourth scenario, when the wind-solar adjustable power is smaller than the primary frequency modulation power command, the wind-solar primary frequency modulation command is output maximum power, and the difference value between the primary frequency modulation power command and the wind-solar primary frequency modulation command is borne by energy storage.
10. Wind and solar energy storage station centralized frequency modulation control system taking into account the frequency characteristics of the power grid, for implementing the method according to any one of claims 1 to 9, characterized in that,
the system comprises: the system comprises an acquisition module, an instruction decomposition module, a scene judgment module and an instruction generation module;
the acquisition module is used for acquiring the operation data of the wind-solar storage station and the frequency data of the grid-connected point;
the instruction decomposition module is used for decomposing the calculated primary frequency modulation power instruction into a low-frequency power component and a high-frequency power component when the frequency change rate exceeds the frequency change rate dead zone and the frequency deviation exceeds the frequency deviation dead zone;
the scene judging module is used for judging that the stored energy is in a charging permission state according to the SOC state information of the stored energy when the frequency deviation direction is in a positive direction, and forming a first scene of wind-solar energy storage frequency adjustment; if the energy storage is judged to be in a non-charging permission state, a second scene of wind-solar energy storage frequency adjustment is formed; when the frequency deviation direction is a negative direction, if the energy storage is judged to be in a non-discharge allowable state according to the SOC state information of the energy storage, a second scene of wind-solar energy storage frequency adjustment is formed; if the energy storage is judged to be in a discharge permission state, judging whether the energy storage can participate in frequency adjustment according to the trend of the frequency change, including: when the frequency is in the deterioration stage, a third scene of wind-solar energy storage frequency adjustment is formed; and the energy storage bears the fast-changing high-frequency power component, and the wind and light bears the slow-changing low-frequency power component; when the frequency is in the recovery stage, a fourth scene of wind-solar energy storage frequency adjustment is formed;
the instruction generation module is used for determining the energy storage primary frequency modulation instruction and the wind-light primary frequency modulation instruction in various scenes according to the primary frequency modulation power instruction, the energy storage adjustable power and the wind-light adjustable power.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111614106A (en) * | 2020-06-02 | 2020-09-01 | 国网福建省电力有限公司 | Control method for battery energy storage system to participate in primary frequency modulation of power grid |
| CN112491064A (en) * | 2020-12-09 | 2021-03-12 | 福州大学 | Energy storage primary frequency modulation comprehensive control method considering SOC adaptive recovery |
| CN113471990A (en) * | 2020-01-03 | 2021-10-01 | 浙江大学台州研究院 | Energy storage multi-scene application cooperative control method |
| CN113890066A (en) * | 2021-11-18 | 2022-01-04 | 广东电网有限责任公司 | Frequency modulation method and device of multi-direct-current feed-in system based on energy storage system |
| CN114039386A (en) * | 2021-11-24 | 2022-02-11 | 国网安徽省电力有限公司电力科学研究院 | Energy storage and wind-electricity combined primary frequency modulation optimization control method |
| CN114696342A (en) * | 2022-04-28 | 2022-07-01 | 中国长江三峡集团有限公司 | AGC (automatic gain control) cooperation-considered rapid frequency modulation control method for wind and light storage station |
| CN115459303A (en) * | 2022-09-21 | 2022-12-09 | 西安理工大学 | Self-adaptive control method for participating in primary frequency modulation of power grid by battery energy storage |
| CN115549128A (en) * | 2022-10-13 | 2022-12-30 | 中国长江三峡集团有限公司 | Primary frequency modulation and AGC coordination control method and device and electronic equipment |
| CN115995825A (en) * | 2022-09-19 | 2023-04-21 | 东北电力大学 | Wind-storage combined frequency control method considering frequency modulation dead zone |
-
2023
- 2023-05-19 CN CN202310573674.XA patent/CN116742699B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113471990A (en) * | 2020-01-03 | 2021-10-01 | 浙江大学台州研究院 | Energy storage multi-scene application cooperative control method |
| CN111614106A (en) * | 2020-06-02 | 2020-09-01 | 国网福建省电力有限公司 | Control method for battery energy storage system to participate in primary frequency modulation of power grid |
| CN112491064A (en) * | 2020-12-09 | 2021-03-12 | 福州大学 | Energy storage primary frequency modulation comprehensive control method considering SOC adaptive recovery |
| CN113890066A (en) * | 2021-11-18 | 2022-01-04 | 广东电网有限责任公司 | Frequency modulation method and device of multi-direct-current feed-in system based on energy storage system |
| CN114039386A (en) * | 2021-11-24 | 2022-02-11 | 国网安徽省电力有限公司电力科学研究院 | Energy storage and wind-electricity combined primary frequency modulation optimization control method |
| CN114696342A (en) * | 2022-04-28 | 2022-07-01 | 中国长江三峡集团有限公司 | AGC (automatic gain control) cooperation-considered rapid frequency modulation control method for wind and light storage station |
| CN115995825A (en) * | 2022-09-19 | 2023-04-21 | 东北电力大学 | Wind-storage combined frequency control method considering frequency modulation dead zone |
| CN115459303A (en) * | 2022-09-21 | 2022-12-09 | 西安理工大学 | Self-adaptive control method for participating in primary frequency modulation of power grid by battery energy storage |
| CN115549128A (en) * | 2022-10-13 | 2022-12-30 | 中国长江三峡集团有限公司 | Primary frequency modulation and AGC coordination control method and device and electronic equipment |
Non-Patent Citations (1)
| Title |
|---|
| 刘青;徐宏璐;: "提高STATCOM/BESS风电系统频率与电压支撑的智能联调优化控制方法", 电力自动化设备, no. 07, pages 86 - 95 * |
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