CN113270904B - Hybrid energy storage frequency modulation control method and device for wind power station - Google Patents

Hybrid energy storage frequency modulation control method and device for wind power station Download PDF

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CN113270904B
CN113270904B CN202110816276.7A CN202110816276A CN113270904B CN 113270904 B CN113270904 B CN 113270904B CN 202110816276 A CN202110816276 A CN 202110816276A CN 113270904 B CN113270904 B CN 113270904B
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energy storage
power
frequency modulation
electric quantity
controlling
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CN113270904A (en
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葛自强
王智勇
马滕
陈烨
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Shenyang Micro Control Active Magnetic Levitation Technology Industry Research Institute Co ltd
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Shenyang Micro Control Active Magnetic Levitation Technology Industry Research Institute Co ltd
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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
    • H02J15/00—Systems for storing electric energy
    • H02J15/007—Systems for storing electric energy involving storage in the form of mechanical energy, e.g. fly-wheels
    • 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
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/30—Arrangements for balancing of the load in a network by storage of energy using dynamo-electric machines coupled to flywheels
    • 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
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • 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
    • 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
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
    • 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
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

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

Abstract

The invention discloses a hybrid energy storage frequency modulation control method and a hybrid energy storage frequency modulation control device for a wind power station, wherein the method comprises the following steps: acquiring power grid frequency deviation, power grid frequency change rate, a first electric quantity state of a power type flywheel energy storage array system and a second electric quantity state of an energy type battery energy storage array system at a grid connection point of a wind power plant; judging whether the hybrid energy storage system meets primary frequency modulation/virtual inertia response and AGC frequency modulation conditions or not according to the first electric quantity state and the second electric quantity state; if so, controlling the wind power station to enter a primary frequency modulation/virtual inertia response control mode or an AGC frequency modulation control mode; if not, the hybrid energy storage system is controlled to enter a locking state. According to the invention, the hybrid energy storage system is configured in the wind power station, and the hybrid energy storage system is controlled to charge and discharge to participate in the primary frequency modulation/virtual inertia response or AGC frequency modulation of the power grid, so that the stability and the safety of new energy power generation participating in the primary frequency modulation/virtual inertia response and AGC frequency modulation of the power grid are improved.

Description

Hybrid energy storage frequency modulation control method and device for wind power station
Technical Field
The invention relates to the technical field of power grid frequency modulation, in particular to a hybrid energy storage frequency modulation control method and device for a wind power station.
Background
In 2050 years, the installed capacity ratio of wind power generation and solar power generation in China is expected to reach 68%, the generated energy ratio is expected to reach 48%, so that a high-proportion new energy power system is formed, and the main tasks of a power grid are safe and stable operation and large-scale new renewable energy power generation. The more random and fluctuating renewable energy sources are connected into the power grid, the greater the influence on the safety and stability of the power system is; meanwhile, the power system has a reduced proportion of power sources with rotational inertia, which may lead to a reduction in the safety and stability of the power system.
The new energy power Generation participates in primary frequency modulation/virtual inertia response and AGC (Automatic Generation Control) frequency modulation, so that steady-state frequency deviation and transient maximum frequency deviation can be reduced, but the frequency change rate cannot be improved due to the fact that system inertia is not improved, and the out-of-limit risk of a low-inertia system still exists. The new energy can provide certain inertia support by adopting virtual inertia control, but secondary accidents such as frequency secondary falling and the like can be caused due to poor controllability of primary energy input. In addition, large scale access of new energy may result in increased risk of frequency violations. When the wind power permeability is low, the power system keeps the original operation mode, the wind power station is not considered by system scheduling and AGC, and the output randomness of the wind power station is completely compensated by the rotation reserve capacity; when the wind power permeability is high, the original active power control mode must be changed by system scheduling and AGC, the output of the wind power station is controlled in real time based on a power prediction technology, and the wind power station has the same frequency modulation capability as a conventional unit.
At present, the main ways for realizing primary frequency modulation/virtual inertia response and AGC frequency modulation of a new energy station in the related prior art include:
(1) rotor kinetic energy control mode: and a signal related to the system frequency is introduced in an active power control link, and the fan participates in the power grid frequency regulation by controlling the energy conversion of the rotational kinetic energy of the rotor of the wind turbine generator and the electromagnetic power. However, the wind turbine generator is affected by different working conditions and wind speeds, so that it is difficult to ensure a high-reliability frequency modulation capacity, and there are problems of short frequency modulation time and secondary frequency drop, which results in low stability and safety. In addition, the mode can only realize a primary frequency modulation function, and cannot realize a virtual inertia response function.
(2) The reserve capacity is reserved by the pitch angle control, thereby providing a wide adjustment range. However, the mechanical part in the pitch angle mechanism has a large inertia constant, the response speed is low, the frequent pitch control operation easily causes mechanical fatigue loss, the maintenance cost is increased, and the reserved spare capacity influences the economical efficiency of the operation of the wind power station. In addition, the mode can only realize the primary frequency modulation function, and cannot realize the virtual inertia response function
(3) A quick frequency response device is additionally arranged in a secondary control room of the new energy station, so that a primary frequency modulation function is realized. However, the primary frequency modulation function is realized by additionally installing the rapid frequency response device, the fan converter needs to be modified, the output can only be reduced on the premise of not reserving spare capacity, and the mode can only realize the primary frequency modulation function and cannot realize the virtual inertia response function.
(4) The wind power station is additionally provided with a centralized energy type battery energy storage system at a 35kV booster station so as to participate in AGC frequency modulation. However, the AGC frequency modulation of the wind power plant is generally realized by additionally installing a centralized battery energy storage system, and if the battery energy storage system frequently responds to the frequency change of the power grid, the life cycle of the battery energy storage system is shortened, the economy is poor, and potential safety hazards such as fire and explosion exist, so that the safety and the reliability are not high.
Disclosure of Invention
The invention aims to solve the technical problems that in the prior art, a wind Power station cannot actively participate in primary frequency modulation/virtual inertia response of a Power grid, cannot participate in AGC (automatic gain control) frequency modulation of the Power grid when MPPT (Maximum Power Point Tracking) or low active Power output exists, and an existing energy type battery energy storage system frequently responds to the primary frequency modulation/virtual inertia and AGC frequency modulation of the Power grid, so that the safety and reliability are low, the service life is short and the economical efficiency is poor.
Therefore, one objective of the present invention is to provide a hybrid energy storage frequency modulation control method for a wind power plant, wherein a hybrid energy storage system is configured in the wind power plant, and the hybrid energy storage system is controlled to charge and discharge to participate in primary frequency modulation/virtual inertia response or AGC frequency modulation of a power grid, so as to improve stability and safety of new energy power generation participating in the primary frequency modulation/virtual inertia response and AGC frequency modulation of the power grid, promote wind power consumption, improve grid-connected friendliness of the wind power plant, improve the profit of participating in compensated primary frequency modulation/virtual inertia response and AGC frequency modulation of the power grid, and improve AGC frequency modulation capability of a wind turbine generator under a full wind speed condition.
To this end, a second objective of the present invention is to provide a hybrid energy storage frequency modulation control device for a wind power plant.
In order to solve the above problem, an embodiment of a first aspect of the present invention provides a hybrid energy storage frequency modulation control method for a wind power plant, where the wind power plant includes a wind power generation unit and a hybrid energy storage system connected to the wind power generation unit, the hybrid energy storage system includes a power type flywheel energy storage array system and an energy type battery energy storage array system, and the hybrid energy storage frequency modulation control method for the wind power plant includes: after an AGC control instruction issued by an automatic power generation control system is received, acquiring the power grid frequency deviation, the power grid frequency change rate, the first electric quantity state of the power type flywheel energy storage array system and the second electric quantity state of the energy type battery energy storage array system at the grid-connected point of the wind power plant station in real time; judging whether the hybrid energy storage system meets primary frequency modulation/virtual inertia response and AGC frequency modulation conditions or not according to the first electric quantity state and the second electric quantity state; if so, controlling the wind power station to enter a primary frequency modulation/virtual inertia response control mode or an AGC frequency modulation control mode according to the power grid frequency deviation and the power grid frequency change rate so as to control the hybrid energy storage system to perform primary frequency modulation/virtual inertia response in the primary frequency modulation/virtual inertia response control mode, or controlling the hybrid energy storage system and the wind power generation unit to perform AGC frequency modulation in the AGC frequency modulation control mode; and if not, controlling the hybrid energy storage system to enter a locking state so as to correct the working state of the hybrid energy storage system until the hybrid energy storage system meets the primary frequency modulation/virtual inertia response and AGC frequency modulation conditions.
According to the hybrid energy storage frequency modulation control method for the wind power station, a hybrid energy storage system is additionally arranged on the wind power station based on an advanced high-power flywheel physical energy storage technology and an energy type battery energy storage technology, so that the wind power station has the functions of responding to primary frequency modulation/virtual inertia response and AGC frequency modulation. By utilizing the short-time high-power frequent charging and discharging characteristics of the power type flywheel energy storage array system, when the power grid frequency is short in occurrence time and small in load disturbance amplitude fluctuation, the power grid frequency change is responded preferentially, namely primary frequency modulation and virtual inertia response are basically realized by the control of the power type flywheel energy storage array system; when the power type flywheel energy storage array system responds to the power grid frequency, the occurrence time is long, the load disturbance amplitude is large, and the power is insufficient or the SOC is insufficient, the energy type battery energy storage array system assists the power type flywheel energy storage array system to carry out frequency modulation, AGC frequency modulation is preferentially responded by the power type flywheel energy storage array system and the energy type battery energy storage array system, and the power regulation is completed by matching with the wind power generation unit. Therefore, the method can give full play to the technical characteristic that the power type flywheel energy storage array system can be charged and discharged frequently with short time and high power, greatly reduce the charging and discharging times of the energy type battery energy storage array system, prolong the service life of the energy type flywheel energy storage array system, reduce the charging and discharging multiplying power and depth of the energy type battery energy storage array system, greatly improve the safety and reliability, reduce the potential safety hazards of battery fire explosion and the like, improve the compensated primary frequency modulation/virtual inertia response compensation income, improve the AGC frequency modulation performance and compensation income of the wind power station, improve the frequency modulation precision, reduce the system operation and maintenance workload, improve the number of operable days, realize that the new energy station has the primary frequency modulation/virtual inertia response and AGC frequency modulation capability under the full working condition operation condition, improve the stability and the interference resistance of the wind power station accessing to the power grid, and meet the energy saving and emission reduction advocated by the country, green development and carbon neutralization development strategy.
In addition, the hybrid energy storage frequency modulation control method for the wind power plant according to the above embodiment of the present invention may further have the following additional technical features:
further, when the first electric quantity state is in a first preset electric quantity range and/or the second electric quantity state is in a second preset electric quantity range, determining that the hybrid energy storage system meets primary frequency modulation/virtual inertia response and AGC frequency modulation conditions; and when the first electric quantity state is not in a first preset electric quantity range and the second electric quantity state is not in a second preset electric quantity range, determining that the hybrid energy storage system does not meet primary frequency modulation/virtual inertia response and AGC frequency modulation conditions, wherein the lower limit value of the first preset electric quantity range is smaller than the lower limit value of the second preset electric quantity range, and the upper limit value of the first preset electric quantity range is larger than the upper limit value of the second preset electric quantity range.
Further, the controlling the hybrid energy storage system to enter a primary frequency modulation/virtual inertia response control mode or an AGC frequency modulation control mode according to the grid frequency deviation and the grid frequency change rate includes: if the power grid frequency deviation exceeds a preset frequency deviation range or the power grid frequency change rate exceeds a preset frequency change rate range, controlling the wind power station to enter the primary frequency modulation/virtual inertia response control mode; and if the power grid frequency deviation does not exceed the preset frequency deviation range and the power grid frequency change rate does not exceed the preset frequency change rate range, controlling the wind power station to enter the AGC frequency modulation control mode.
Further, in the AGC frequency modulation control mode, the method includes: if the AGC control instruction is a load reduction control instruction, comparing the total active power of the hybrid energy storage system with a first preset active power contained in the load reduction control instruction; if the first preset active power is smaller than or equal to the total active power, controlling the hybrid energy storage system to independently absorb the active power; and if the first preset active power is larger than the total active power, controlling the hybrid energy storage system to absorb the active power at full power, and simultaneously controlling the wind power generation unit to absorb the active power so as to provide power compensation.
Further, in the process of controlling the hybrid energy storage system to absorb active power alone and controlling the hybrid energy storage system to absorb active power at full power, the method further includes: judging whether the first electric quantity state reaches an upper limit value of the first preset electric quantity range, if so, controlling the power type flywheel energy storage array system to stop absorbing active power, and independently absorbing the active power by the energy type battery energy storage array system; if the first electric quantity state does not reach the upper limit value of the first preset electric quantity range, judging whether the second electric quantity state reaches the upper limit value of the second preset electric quantity range, if so, controlling the energy type battery energy storage array system to stop absorbing active power, and controlling the hybrid energy storage system to enter the locking state; if the second electric quantity state does not reach the upper limit value of the second preset electric quantity range, controlling the energy type battery energy storage array system to continuously and independently absorb active power until AGC frequency modulation corresponding to the load reduction control instruction is completed; in the process of controlling the wind power generation unit to absorb active power, the method further comprises the following steps: judging whether the active power of the wind power generation unit is smaller than or equal to a preset power threshold value, if so, controlling the wind power generation unit to lock down and adjust the power; and if not, controlling the wind power generation unit to adjust the pitch angle of the fan so as to reduce the active power output until AGC frequency modulation corresponding to the load reduction control instruction is completed.
Further, in the AGC frequency modulation control mode, the method further includes: if the AGC control instruction is a load increase control instruction, comparing the total active power of the hybrid energy storage system with a second preset active power contained in the load increase control instruction; if the second preset active power is smaller than or equal to the total active power, controlling the hybrid energy storage system to independently release the active power; and if the second preset active power is larger than the total active power, controlling the hybrid energy storage system to release the active power at full power, and simultaneously controlling the wind power generation unit to release the active power to provide power compensation.
Further, in the process of controlling the hybrid energy storage system to release active power alone and controlling the hybrid energy storage system to release active power at full power, the method further includes: judging whether the first electric quantity state reaches a lower limit value of the first preset electric quantity range, if so, controlling the power type flywheel energy storage array system to stop releasing active power, and independently releasing the active power by the energy type battery energy storage array system; if the first electric quantity state does not reach the lower limit value of the first preset electric quantity range, judging whether the second electric quantity state reaches the lower limit value of the second preset electric quantity range, if so, controlling the energy type battery energy storage array system to stop releasing active power, and controlling the hybrid energy storage system to enter the locking state; if the second electric quantity state does not reach the lower limit value of the second preset electric quantity range, controlling the energy type battery energy storage array system to continuously and independently release active power until AGC frequency modulation corresponding to the load increase control instruction is completed; in the process of controlling the wind power generation unit to release active power, the method further comprises the following steps: judging the fan speed of the wind power generation unit; if the wind speed of the fan is in a first preset wind speed interval, controlling the wind power generation unit to operate in a maximum power point tracking mode; and if the wind speed of the fan is in a second preset wind speed interval, controlling the wind power generation unit to adjust the pitch angle of the fan so as to increase the active power output until AGC frequency modulation corresponding to the load increase control instruction is completed, wherein the upper limit value of the first preset wind speed interval is smaller than the lower limit value of the second preset wind speed interval.
Further, in the primary frequency modulation/virtual inertia response control mode, the method includes: locking the AGC control instruction, and calculating the active power regulating variable of the hybrid energy storage system according to the power grid frequency deviation and the power grid frequency change rate; judging the working state of the hybrid energy storage system; if the hybrid energy storage system is in a working state of absorbing active power, judging whether the active power regulating quantity is smaller than or equal to a preset power regulating quantity threshold value, if so, controlling the power type flywheel energy storage array system to absorb the active power alone, otherwise, controlling the power type flywheel energy storage array system to absorb the active power with full power, and simultaneously controlling the energy type battery energy storage array system to absorb the active power to provide power compensation; in the process of controlling the power type flywheel energy storage array system to absorb active power independently and controlling the power type flywheel energy storage array system to absorb active power at full power, judging whether the first electric quantity state reaches an upper limit value of the first preset electric quantity range, if so, controlling the power type flywheel energy storage array system to stop absorbing active power, and absorbing active power independently by the energy type battery energy storage array system; if the first electric quantity state does not reach the upper limit value of the first preset electric quantity range, judging whether the second electric quantity state reaches the upper limit value of the second preset electric quantity range, if so, controlling the energy type battery energy storage array system to stop absorbing active power, and controlling the hybrid energy storage system to enter the locking state; if the second electric quantity state does not reach the upper limit value of the second preset electric quantity range, the energy type battery energy storage array system is controlled to continuously and independently absorb active power until the power grid frequency deviation is smaller than or equal to the upper limit value of the preset frequency deviation range, and the power grid frequency change rate is smaller than a preset first frequency change rate threshold value, wherein the first frequency change rate threshold value is smaller than the upper limit value of the preset frequency change rate range.
Further, after the working state of the hybrid energy storage system is judged, the method further comprises the following steps: if the hybrid energy storage system is in a working state of releasing active power, judging whether the active power regulating quantity is smaller than or equal to a preset power regulating quantity threshold value, if so, controlling the power type flywheel energy storage array system to release the active power alone, otherwise, controlling the power type flywheel energy storage array system to release the active power at full power, and simultaneously controlling the energy type battery energy storage array system to release the active power to provide power compensation; in the process of controlling the power type flywheel energy storage array system to independently release active power and controlling the power type flywheel energy storage array system to release the active power at full power, judging whether the first electric quantity state reaches a lower limit value of the first preset electric quantity range, if so, controlling the power type flywheel energy storage array system to stop releasing the active power, and independently releasing the active power by the energy type battery energy storage array system; if the first electric quantity state does not reach the lower limit value of the first preset electric quantity range, judging whether the second electric quantity state reaches the lower limit value of the second preset electric quantity range, if so, controlling the energy type battery energy storage array system to stop releasing active power, and controlling the hybrid energy storage system to enter the locking state; if the second electric quantity state does not reach the lower limit value of the second preset electric quantity range, the energy type battery energy storage array system is controlled to continuously and independently release active power until the power grid frequency deviation is larger than the lower limit value of the preset frequency deviation range, and the power grid frequency change rate is larger than or equal to a preset second frequency change rate threshold value, wherein the second frequency change rate threshold value is larger than the lower limit value of the preset frequency change rate range.
In order to solve the above problem, an embodiment of a second aspect of the present invention provides a hybrid energy storage frequency modulation control apparatus for a wind power plant, where the wind power plant includes a wind power generation unit and a hybrid energy storage system connected to the wind power generation unit, the hybrid energy storage system includes a power type flywheel energy storage array system and an energy type battery energy storage array system, and the hybrid energy storage frequency modulation control apparatus for the wind power plant includes: the acquisition module is used for acquiring the power grid frequency deviation, the power grid frequency change rate, the first electric quantity state of the power type flywheel energy storage array system and the second electric quantity state of the energy type battery energy storage array system at the grid-connected point of the wind power plant station in real time after receiving an AGC control instruction issued by an automatic power generation control system; the judging module is used for judging whether the hybrid energy storage system meets primary frequency modulation/virtual inertia response and AGC frequency modulation conditions according to the first electric quantity state and the second electric quantity state; the control module is used for controlling the wind power station to enter a primary frequency modulation/virtual inertia response control mode or an AGC frequency modulation control mode according to the power grid frequency deviation and the power grid frequency change rate when the hybrid energy storage system meets primary frequency modulation/virtual inertia response and AGC frequency modulation conditions, so that the hybrid energy storage system is controlled to perform primary frequency modulation/virtual inertia response in the primary frequency modulation/virtual inertia response control mode, or the hybrid energy storage system and the wind power generation unit are controlled to perform AGC frequency modulation in the AGC frequency modulation control mode; and when the hybrid energy storage system does not meet the primary frequency modulation/virtual inertia response and AGC frequency modulation conditions, controlling the hybrid energy storage system to enter a locking state so as to correct the working state of the hybrid energy storage system until the hybrid energy storage system meets the primary frequency modulation/virtual inertia response and AGC frequency modulation conditions.
According to the hybrid energy storage frequency modulation control device for the wind power station, a hybrid energy storage system is additionally arranged on the wind power station based on an advanced high-power flywheel physical energy storage technology and an energy type battery energy storage technology, so that the wind power station has the functions of responding to primary frequency modulation/virtual inertia response and AGC frequency modulation. By utilizing the short-time high-power frequent charging and discharging characteristics of the power type flywheel energy storage array system, when the power grid frequency is short in occurrence time and small in load disturbance amplitude fluctuation, the power grid frequency change is responded preferentially, namely primary frequency modulation and virtual inertia response are basically realized by the control of the power type flywheel energy storage array system; when the power type flywheel energy storage array system responds to the power grid frequency, the occurrence time is long, the load disturbance amplitude is large, and the power is insufficient or the SOC is insufficient, the energy type battery energy storage array system assists the power type flywheel energy storage array system to carry out frequency modulation, AGC frequency modulation is preferentially responded by the power type flywheel energy storage array system and the energy type battery energy storage array system, and the power regulation is completed by matching with the wind power generation unit. Therefore, the device can fully play the technical characteristic that the power type flywheel energy storage array system can be frequently charged and discharged with high power for a short time, greatly reduce the charging and discharging times of the energy type battery energy storage array system, prolong the service life of the energy type flywheel energy storage array system, reduce the charging and discharging multiplying power and the depth of the energy type battery energy storage array system, greatly improve the safety and the reliability, reduce the potential safety hazards of fire explosion and the like of the battery, improve the compensated primary frequency modulation/virtual inertia response compensation income, improve the AGC frequency modulation performance and the compensation income of the wind power station, improve the frequency modulation precision, reduce the operation and maintenance workload of the system, improve the number of days in operation, realize that the new energy station has the primary frequency modulation/virtual inertia response and AGC frequency modulation capability under the operating condition of the whole working condition, improve the stability and the interference resistance of the wind power station to be connected to a power grid, and meet the energy saving and emission reduction advocated by the country, green development and carbon neutralization development strategy.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural diagram of a wind farm according to one embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a station-level hybrid energy storage general control system according to an embodiment of the present invention;
FIG. 3 is a flow chart of a hybrid energy storage frequency modulation control method for a wind power plant according to one embodiment of the present invention;
FIG. 4 is a schematic diagram of a process for controlling a hybrid energy storage system to enter a primary/virtual inertia response control mode or an AGC frequency modulation control mode according to a grid frequency deviation and a grid frequency change rate according to an embodiment of the present invention;
fig. 5 is a schematic control flow diagram in the AGC frequency modulation control mode according to an embodiment of the present invention;
FIG. 6 is a schematic control flow diagram of a primary tuning/virtual inertia response control mode according to an embodiment of the present invention;
fig. 7 is a block diagram of a hybrid energy storage frequency modulation control device for a wind power plant according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.
The hybrid energy storage frequency modulation control method and device for the wind power station according to the embodiment of the invention are described below with reference to fig. 1 to 7.
First, the wind farm in question is described in connection with fig. 1. As shown in fig. 1, the wind power plant includes a wind power generation unit and a hybrid energy storage system connected to the wind power generation unit, and the hybrid energy storage system includes a power type flywheel energy storage array system and an energy type battery energy storage array system.
As shown in fig. 1, the wind power plant further includes a fan energy management system, a flywheel array master control system, a battery array master control system, a plant-level hybrid energy storage system master control device, a plant-level AGC control system, and a scheduling master station control system. The wind power generation system comprises a wind power generation unit, a flywheel array master control system, a battery array master control system and a wind power generation unit. The fan energy management system, the flywheel array master control system and the battery array master control system are controlled by the station level hybrid energy storage system master control device in a scheduling mode.
In other words, the wind power plant includes a wind power generation unit and a hybrid energy storage system, and the hybrid energy storage system includes a power type flywheel energy storage array system and an energy type battery energy storage array system. The power type flywheel energy storage array system is formed by connecting N flywheel energy storage units in parallel, is deployed in a container type, outputs 0.4kV alternating current after being inverted by a PCS (Power Conversion System) energy storage converter, boosts the voltage to 35kV by a booster transformer, and then is connected to a 35kV current collection bus of a wind power station in parallel. The energy type battery energy storage array system comprises a battery module and a battery cluster which are formed by connecting N battery cells in series and in parallel, and is deployed in a container type, outputs 0.4kV alternating current after being inverted by a PCS (Power Conversion System) energy storage converter, boosts the alternating current to 35kV through a booster transformer, and is connected to a 35kV current collection bus of a wind power station in parallel. The power type flywheel energy storage array system and the energy type battery energy storage array system are respectively connected in parallel to a 35kV current collection bus of the wind power station to form a hybrid energy storage system, and the station level hybrid energy storage system master control device respectively controls the wind power generation unit, the power type flywheel energy storage array system and the energy type battery energy storage array system through the fan energy management system, the flywheel array master control system and the battery array master control system.
As shown in fig. 2, the station-level hybrid energy storage system master control device mainly includes: the device comprises a data sampling module, a state detection module, a mode judgment module, a digital operation module, a logic matching module and a control module. And the station level hybrid energy storage system master control device is used for controlling the fan energy management system to execute an AGC control instruction and controlling the cooperative output of the flywheel array master control system and the battery array master control system.
Specifically, the data sampling module is used for acquiring AGC control instructions, current, voltage and frequency signals at a grid-connected point of a wind power plant and active power of a power type flywheel energy storage array system in real time
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Active power of energy-type battery energy storage array system
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Total active power of hybrid energy storage system
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First electric quantity state of power type flywheel energy storage array system
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And a second state of charge of the energy storage array system
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And each subsystem alarms and warns in real time (for example, the running state information such as the rotating speed, the vacuum degree, the temperature, the voltage and the current of the flywheel energy storage unit, the running state information such as the voltage, the internal resistance and the temperature of the battery cell, the running state information of the wind power generation unit and the like).
The state detection module is used for detecting SOC electric quantity states, alarming and warning information of the power type flywheel energy storage array system and the energy type battery energy storage array system in real time and detecting whether the hybrid energy storage system has conditions for responding to primary frequency modulation/virtual inertia response of a power grid and AGC frequency modulation.
The mode judging module is used for judging the frequency deviation according to the power grid
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Or rate of change of grid frequency
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And judging whether the wind power station needs to participate in primary frequency modulation/virtual inertia response of the power grid and AGC frequency modulation.
The digital operation module is used for calculating the initial value of the real-time active power of the wind power station according to the collected current and voltage signals at the grid-connected point
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According to the detected power grid frequency deviation value
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And rate of change of grid frequency
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Calculating the active power adjustment of primary frequency modulation or virtual inertia response
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And
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according to the AGC control instruction obtained in real time, the real-time active power initial value of the wind power station is combined
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Calculating AGC frequency modulation active power regulating quantity
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Corresponding to AGC frequency modulation load increasing instruction and load decreasing instruction are respectively
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And
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。
and the logic matching module is used for matching the primary frequency modulation/virtual inertia response of the mode judging module and the AGC frequency modulation result.
The control module is used for generating a corresponding control strategy and controlling the power type flywheel energy storage array system and the energy type battery energy storage array system to cooperate with the wind power generation unit to output power to carry out frequency modulation.
Fig. 3 is a flowchart of a hybrid energy storage frequency modulation control method for a wind power plant according to an embodiment of the present invention. As shown in fig. 3, the hybrid energy storage frequency modulation control method for the wind power plant includes the following steps:
step S1: after an AGC control instruction issued by an automatic power generation control system is received, the power grid frequency deviation, the power grid frequency change rate, the first electric quantity state of a power type flywheel energy storage array system and the second electric quantity state of an energy type battery energy storage array system at a grid-connected point of a wind power station are obtained in real time.
In a specific embodiment, the AGC control instruction issued by the AGC system includes a power generation plan and a power adjustment instruction, where the power generation plan and the power adjustment instruction at least include an active power target value of the wind power plant. Specifically, the AGC system obtains a power generation plan and a power regulation instruction of a current wind power station from a dispatching master station control system and issues a related AGC control instruction, the station level hybrid energy storage system master control device receives the AGC control instruction issued by the AGC system, and the voltage, current and power grid frequency deviation at a grid-connected point of the wind power station are obtained in real time through a data sampling module and a state detection module of the station level hybrid energy storage system master control device
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Grid frequency rate of change
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First electric quantity state of power type flywheel energy storage array system
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And a second state of charge of the energy storage array system
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。
Step S2: according to the first electric quantity state
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And a second state of charge
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And judging whether the hybrid energy storage system meets primary frequency modulation/virtual inertia response and AGC frequency modulation conditions.
Step S3: if so, judging that the hybrid energy storage system meets primary frequency modulation/virtual inertia response and AGC frequency modulation conditions, and controlling the wind power station to enter a primary frequency modulation/virtual inertia response control mode or an AGC frequency modulation control mode according to the power grid frequency deviation and the power grid frequency change rate so as to control the hybrid energy storage system to perform primary frequency modulation/virtual inertia response in the primary frequency modulation/virtual inertia response control mode, or controlling the hybrid energy storage system and the wind power generation unit to perform AGC frequency modulation in the AGC frequency modulation control mode.
Step S4: if not, the hybrid energy storage system is judged not to meet the primary frequency modulation/virtual inertia response and AGC frequency modulation conditions, and the hybrid energy storage system is controlled to enter a locking state without primary frequency modulation/virtual inertia response and AGC frequency modulation so as to correct the working state of the hybrid energy storage system until the hybrid energy storage system meets the primary frequency modulation/virtual inertia response and AGC frequency modulation conditions.
Therefore, the hybrid energy storage frequency modulation control method for the wind power station is based on the advanced high-power flywheel physical energy storage technology and the energy type battery energy storage technology, and a hybrid energy storage system is additionally arranged on the wind power station, so that the wind power station has the functions of responding to primary frequency modulation/virtual inertia response and AGC frequency modulation. By utilizing the short-time high-power frequent charging and discharging characteristics of the power type flywheel energy storage array system, when the power grid frequency is short in occurrence time and small in load disturbance amplitude fluctuation, the power grid frequency change is responded preferentially, namely primary frequency modulation and virtual inertia response are basically realized by the control of the power type flywheel energy storage array system; when the power type flywheel energy storage array system responds to the power grid frequency, the occurrence time is long, the load disturbance amplitude is large, and the power is insufficient or the SOC is insufficient, the energy type battery energy storage array system assists the power type flywheel energy storage array system to carry out frequency modulation, AGC frequency modulation is preferentially responded by the power type flywheel energy storage array system and the energy type battery energy storage array system, and the power regulation is completed by matching with the wind power generation unit. Therefore, the method can give full play to the technical characteristic that the power type flywheel energy storage array system can be charged and discharged frequently with short time and high power, greatly reduce the charging and discharging times of the energy type battery energy storage array system, prolong the service life of the energy type flywheel energy storage array system, reduce the charging and discharging multiplying power and depth of the energy type battery energy storage array system, greatly improve the safety and reliability, reduce the potential safety hazards of battery fire explosion and the like, improve the compensated primary frequency modulation/virtual inertia response compensation income, improve the AGC frequency modulation performance and compensation income of the wind power station, improve the frequency modulation precision, reduce the system operation and maintenance workload, improve the number of operable days, realize that the new energy station has the primary frequency modulation/virtual inertia response and AGC frequency modulation capability under the full working condition operation condition, improve the stability and the interference resistance of the wind power station accessing to the power grid, and meet the energy saving and emission reduction advocated by the country, green development and carbon neutralization development strategy.
In one embodiment of the present invention, when the first state of charge is present
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In a first predetermined charge range, and/or in a second charge state
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When the hybrid energy storage system is in a second preset electric quantity range, determining that the hybrid energy storage system meets primary frequency modulation/virtual inertia response and AGC frequency modulation conditions; and when the first electric quantity state is not in a first preset electric quantity range and the second electric quantity state is not in a second preset electric quantity range, determining that the hybrid energy storage system does not meet primary frequency modulation/virtual inertia response and AGC frequency modulation conditions, wherein the lower limit value of the first preset electric quantity range is smaller than the lower limit value of the second preset electric quantity range, and the upper limit value of the first preset electric quantity range is larger than the upper limit value of the second preset electric quantity range.
In one embodiment, the first predetermined charge range is denoted as
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，
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) The second predetermined electric quantity range is recorded as (
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，
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) The lower limit value of the first preset electric quantity range is
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The upper limit value of the first preset electric quantity range is
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The lower limit value of the second preset electric quantity range is
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The upper limit value of the second preset electric quantity range is
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. Then the process of the first step is carried out,
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is less than
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，
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Is greater than
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. In a specific example, because the power type flywheel energy storage array system adopts a physical energy storage mode, the problem of SOC electric quantity attenuation does not exist, therefore,
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the value is 0%,
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the value is 100%, namely the first preset electric quantity range is (0%, 100%); the problem of insufficient SOC electric quantity of the energy storage array system of the energy type battery along with the increase of the charging and discharging times is solved, in order to prevent the overcharge or the overdischarge,the SOC charge is constrained, and therefore,
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the value is 20%,
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the value is 80%, i.e. the second predetermined electric quantity range is (20%, 80%).
Specifically, the first state of charge of the power type flywheel energy storage array system collected in step S1 is used as the basis
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And a second state of charge of the energy storage array system
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And judging whether the hybrid energy storage system has primary frequency modulation/virtual inertia response and AGC frequency modulation conditions. When in use
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In a first predetermined electric quantity range (
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，
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) In addition to
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In a second predetermined electric quantity range (
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，
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) When the hybrid energy storage system does not meet the primary frequency modulation/virtual inertia response and AGC frequency modulation conditions, the hybrid energy storage system is controlled to enter a locking state and does not participate in the primary frequency modulation/virtual inertia response and AGC frequency modulation, and the hybrid energy storage system is obtained in real timeAnd correcting the working state of the hybrid energy storage system by the energy system data and the state information until the hybrid energy storage system meets the primary frequency modulation/virtual inertia response and AGC frequency modulation conditions. Otherwise, i.e. when
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In a first predetermined electric quantity range (
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，
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) In, and/or
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In a second predetermined electric quantity range (
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，
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) When being internally worn, i.e.
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And/or
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When the hybrid energy storage system meets the primary frequency modulation/virtual inertia response and AGC frequency modulation conditions, namely the hybrid energy storage system needs to participate in the primary frequency modulation/virtual inertia response or AGC frequency modulation, and the hybrid energy storage system can be subjected to power grid frequency deviation
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Or rate of change of grid frequency
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And determining which one of the primary frequency modulation/virtual inertia response of the power grid and AGC frequency modulation needs to be participated in by the wind power station. Generally, the SOC state of charge is optimal at 50%.
In one embodiment of the inventionIn accordance with the grid frequency deviation
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And rate of change of grid frequency
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Controlling a hybrid energy storage system to enter a primary frequency modulation/virtual inertia response control mode or an AGC frequency modulation control mode, comprising: if the frequency of the power grid deviates
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Out of the predetermined frequency deviation range or the grid frequency change rate
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If the frequency exceeds the preset frequency change rate range, controlling the wind power station to enter a primary frequency modulation/virtual inertia response control mode; if the frequency of the power grid deviates
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The frequency deviation range is not exceeded, and the change rate of the power grid frequency is
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And if the frequency variation rate does not exceed the preset frequency variation rate range, controlling the wind power station to enter an AGC frequency modulation control mode.
In one embodiment, referring to FIG. 4, the predetermined frequency deviation range is denoted by (
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，
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) The predetermined frequency variation range is noted as (-0.2 Hz/s, +0.2 Hz/s). To determine the frequency deviation of the power grid
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Exceed (
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，
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) I.e. by
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Or
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Or rate of change of grid frequency
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Over (-0.2 Hz/s, +0.2 Hz/s), i.e.
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Or
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And locking the AGC control instruction, and controlling the wind power station to enter a primary frequency modulation/virtual inertia response control mode so as to execute a primary frequency modulation/virtual inertia response action. In particular when
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Or
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When the frequency modulation is performed, a primary frequency modulation action is performed
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Or
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And executing the virtual inertia response action. On the other hand, when the grid frequency deviation is judged
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Not exceed (
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，
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) I.e. by
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Or rate of change of grid frequency
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Not exceeding (-0.2 Hz/s, +0.2 Hz/s), i.e.
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And controlling the wind power station to enter an AGC frequency modulation control mode to respond to an AGC control instruction, and not executing primary frequency modulation/virtual inertia response action. In other words, namely at
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And
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and under the condition of not exceeding the limit, the active power control of the wind power station adopts an AGC frequency modulation control mode.
In an embodiment of the present invention, as shown in fig. 5, in the AGC frequency modulation control mode, the method specifically includes: if the AGC control instruction is a load reduction control instruction, comparing the total active power of the hybrid energy storage system
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And a first preset active power contained in the load reduction control command
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(ii) a If the first predetermined active power
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Less than or equal to the total active power
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Controlling the hybrid energy storage system to absorb active power independently; if the first predetermined active power
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Greater than total active power
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The hybrid energy storage system is controlled to absorb active power at full power, and the wind power generation unit is controlled to absorb active power to provide power compensation.
In an embodiment of the present invention, as shown in fig. 5, in the process of controlling the hybrid energy storage system to absorb the active power alone and controlling the hybrid energy storage system to absorb the active power at the full power, the method further includes: judging the first electric quantity state
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Whether the upper limit value of the first preset electric quantity range is reached
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If so, controlling the power type flywheel energy storage array system to stop absorbing active power, and independently absorbing the active power by the energy type battery energy storage array system; if the first electric quantity state
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The upper limit value of the first preset electric quantity range is not reached
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Then, the second electric quantity state is judged
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Whether the upper limit value of the second preset electric quantity range is reached
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If so, controlling the energy type battery energy storage array system to stop absorbing active power, and controlling the hybrid energy storage system to enter a locking state; if the second electric quantity state
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The upper limit value of the second preset electric quantity range is not reached
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And controlling the energy storage array system of the energy type battery to continuously and independently absorb the active power until AGC frequency modulation corresponding to the load reduction control instruction is completed.
In the process of controlling the wind power generation unit to absorb active power, the method further comprises the following steps: judging whether the active power of the wind power generation unit is smaller than or equal to a preset power threshold value, if so, controlling the wind power generation unit to lock and adjust the power downwards; and if not, controlling the wind power generation unit to adjust the pitch angle of the fan to reduce the active power output until AGC frequency modulation corresponding to the load reduction control instruction is completed. Wherein the predetermined power threshold is, for example, 10% of the rated installed power capacity of the wind power generation unit, and is denoted as 10% PN，PNIs the rated installed power capacity of the wind power generation unit.
Specifically, after the AGC frequency modulation control mode is entered, the AGC control command is executed, and it is first determined whether the AGC control command is an increase load control command or a decrease load control command.
If the AGC control instruction is a load reduction control instruction, comparing the total active power of the hybrid energy storage system
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And active power in the load shedding control command
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The size of (2).
If it is
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The hybrid energy storage system separately absorbs the active power and further judges during the process of absorbing the active power
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Whether or not equal to
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If not, the hybrid energy storage system continues to execute the frequency modulation action, if so, the power type flywheel energy storage array system quits the frequency modulation, namely stops absorbing the active power, the energy type battery energy storage array system independently performs the frequency modulation, namely, the energy type battery energy storage array system independently absorbs the active power, and further judges that the active power is absorbed by the energy type battery energy storage array system in the process of independently absorbing the active power by the energy type battery energy storage array system
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Whether or not equal to
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If not, the energy type battery energy storage array system continues to execute frequency modulation action until the load reduction control instruction is completed; if yes, the judgment is made
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Is equal to
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And controlling the energy type battery energy storage array system to stop absorbing active power, stopping frequency modulation of the hybrid energy storage system at the moment, entering a locking state, correcting the state, and providing power compensation by the wind power generation unit.
If it is
Figure 644276DEST_PATH_IMAGE046
And the hybrid energy storage system and the wind power generation unit cooperatively participate in AGC frequency modulation, the wind power generation unit provides active power compensation, and the full power of the hybrid energy storage system absorbs the active power. In the process of providing active power compensation for the wind power generation unit, whether the active power of the wind power generation unit is smaller than or equal to the rated installed capacity P is judgedNIf yes, locking the power down command; if the active power of the wind power generation unit is larger than the rated installed capacity PN10% of the active power output is reduced by adjusting the pitch angle. Wherein the excess of active power is absorbed in the hybrid energy storage systemIn the process, further judgment is made
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Whether or not equal to
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If so, the power type flywheel energy storage array system quits frequency modulation, the energy type battery energy storage array system independently performs frequency modulation, and further judgment is made in the process of independently performing frequency modulation on the energy type battery energy storage array system
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Whether or not equal to
Figure 874083DEST_PATH_IMAGE020
If not, the energy type battery energy storage array system continues to execute frequency modulation action and completes load reduction control instructions in cooperation with the wind power generation unit, and if yes, judgment is made
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Is equal to
Figure 494869DEST_PATH_IMAGE021
And controlling the energy type battery energy storage array system to stop absorbing active power, stopping frequency modulation of the hybrid energy storage system at the moment, entering a locking state, correcting the state, and performing frequency modulation by the wind power generation unit independently.
In an embodiment of the present invention, as shown in fig. 5, in the AGC fm control mode, the method further includes:
if the AGC control instruction is a load increasing control instruction, comparing the total active power of the hybrid energy storage system
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And a second preset active power contained in the load increase control command
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(ii) a If the second predetermined active power
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Less than or equal to the total active power
Figure 191112DEST_PATH_IMAGE042
Controlling the hybrid energy storage system to independently release active power; if the second predetermined active power
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Greater than total active power
Figure 689407DEST_PATH_IMAGE042
And controlling the hybrid energy storage system to release active power at full power, and simultaneously controlling the wind power generation unit to release active power to provide power compensation.
In an embodiment of the present invention, as shown in fig. 5, in the process of controlling the hybrid energy storage system to release active power alone and controlling the hybrid energy storage system to release active power at full power, the method further includes: judging the first electric quantity state
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Whether the lower limit value of the first preset electric quantity range is reached
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If so, controlling the power type flywheel energy storage array system to stop releasing active power, and independently releasing the active power by the energy type battery energy storage array system; if the first electric quantity state
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The lower limit value of the first preset electric quantity range is not reached
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Then, the second electric quantity state is judged
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Whether the lower limit value of the second preset electric quantity range is reached
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If so, controlling the energy type battery energy storage array system to stop releasing active power, and controlling the hybrid energy storage system to enter a locking state; if the second electric quantity state
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The lower limit value of the second preset electric quantity range is not reached
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And controlling the energy storage array system of the energy type battery to continuously and independently release active power until AGC frequency modulation corresponding to the load increase control instruction is completed.
In the process of controlling the wind power generation unit to release active power, the method further comprises the following steps: judging the fan wind speed of the wind power generation unit; if the wind speed of the fan is in a first preset wind speed interval, controlling the wind power generation unit to operate in an MPPT maximum power point tracking mode; and if the wind speed of the fan is in a second preset wind speed interval, controlling the wind power generation unit to adjust the pitch angle of the fan so as to increase the active power output until AGC frequency modulation corresponding to the load increase control instruction is completed, wherein the upper limit value of the first preset wind speed interval is smaller than the lower limit value of the second preset wind speed interval. Specifically, the wind speed in the first preset wind speed interval is smaller than the wind speed in the second preset wind speed interval, and in comparison, it can be understood that when the wind speed of the fan is in the first preset wind speed interval, the wind speed of the fan is considered to be the medium-low wind speed; and when the wind speed of the fan is within the second preset wind speed interval, the wind speed of the fan is considered as high wind speed. Wherein, the wind power generation unit does not have the load increasing condition under the MPPT operation mode.
Specifically, after the AGC frequency modulation control mode is entered, the AGC control command is executed, and it is first determined whether the AGC control command is an increase load control command or a decrease load control command.
If the AGC control instruction is a load increasing control instruction, comparing the total active power of the hybrid energy storage system
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And active power in the boost control command
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The size of (2).
If it is
Figure 336791DEST_PATH_IMAGE048
The active power is released by the hybrid energy storage system alone, and further judgment is made in the process of releasing the active power
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Whether or not equal to
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If not, the hybrid energy storage system continues to execute the frequency modulation action, if so, the power type flywheel energy storage array system exits the frequency modulation, namely, the active power is stopped to be released, the energy type battery energy storage array system independently performs the frequency modulation, namely, the energy type battery energy storage array system independently releases the active power, and in the process of independently releasing the active power by the energy type battery energy storage array system, the further judgment is made
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Whether or not equal to
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If not, the energy type battery energy storage array system continues to execute frequency modulation action until the load increase control instruction is completed; if yes, the judgment is made
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Is equal to
Figure 838497DEST_PATH_IMAGE049
And controlling the energy type battery energy storage array system to stop releasing active power, stopping frequency modulation of the hybrid energy storage system at the moment, entering a locking state, correcting the state, and providing power compensation by the wind power generation unit.
If it is
Figure 841088DEST_PATH_IMAGE050
And the hybrid energy storage system and the wind power generation unit cooperatively participate in AGC frequency modulation, the wind power generation unit provides active power compensation, and the full power of the hybrid energy storage system releases the active power. Judging the interval of the wind speed of a fan of the wind power generation unit in the process of providing active power compensation by the wind power generation unit, and entering an MPPT (maximum power point tracking) operation mode if the wind speed of the fan is a medium-low wind speed; and if the wind speed of the fan is high, controlling the fan to adjust the pitch angle to increase the power output until the load increase control instruction is completed. Wherein, in the process of releasing active power of the hybrid energy storage system, the further judgment is carried out
Figure 941637DEST_PATH_IMAGE004
Whether or not equal to
Figure 105902DEST_PATH_IMAGE014
If so, the power type flywheel energy storage array system quits frequency modulation, the energy type battery energy storage array system independently performs frequency modulation, and further judgment is made in the process of independently performing frequency modulation on the energy type battery energy storage array system
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Whether or not equal to
Figure 357072DEST_PATH_IMAGE016
If not, the energy type battery energy storage array system continues to execute frequency modulation action and completes the load increase control instruction in cooperation with the wind power generation unit, and if yes, judgment is made
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Is equal to
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And controlling the energy type battery energy storage array system to stop releasing active power, stopping frequency modulation of the hybrid energy storage system, entering a locking state, and performing state correctionAnd the wind power generation unit is used for independently carrying out frequency modulation.
In the MPPT operation mode, the wind turbine generator unit does not have a load increase condition.
In an embodiment of the present invention, as shown in fig. 6, in the primary frequency modulation/virtual inertia response control mode, the method specifically includes: blocking AGC control commands and according to grid frequency deviation
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And rate of change of grid frequency
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Calculating an active power adjustment for a hybrid energy storage system
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(ii) a Judging the working state of the hybrid energy storage system; if the hybrid energy storage system is in a working state of absorbing active power, judging the adjustment quantity of the active power
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Whether or not it is less than or equal to a preset power adjustment threshold
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And if so, controlling the power type flywheel energy storage array system to absorb active power independently, otherwise, controlling the power type flywheel energy storage array system to absorb the active power at full power, and simultaneously controlling the energy type battery energy storage array system to absorb the active power so as to provide power compensation.
Wherein, in the process of controlling the power type flywheel energy storage array system to absorb the active power independently and controlling the power type flywheel energy storage array system to absorb the active power with the full power, the first electric quantity state is judged
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Whether the upper limit value of the first preset electric quantity range is reached
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If so, controlling the power type flywheel energy storage array system to stop absorbing active power, and independently absorbing the active power by the energy type battery energy storage array system; if the first electric quantity state
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The upper limit value of the first preset electric quantity range is not reached
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Then, the second electric quantity state is judged
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Whether the upper limit value of the second preset electric quantity range is reached
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If so, controlling the energy type battery energy storage array system to stop absorbing active power, and controlling the hybrid energy storage system to enter a locking state; if the second electric quantity state
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The upper limit value of the second preset electric quantity range is not reached
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Controlling the energy type battery energy storage array system to continuously and independently absorb the active power until the frequency deviation of the power grid
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Less than or equal to the upper limit of the preset frequency deviation range
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And rate of change of grid frequency
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Is less than a preset first frequency change rate threshold value, wherein the first frequency change rate threshold value is less than an upper limit value of a preset frequency change rate range, namely+0.2 Hz/s. In a specific embodiment, the first frequency rate threshold value is +0.15 Hz/s.
Specifically, after entering the primary frequency modulation/virtual inertia response control mode, the AGC control command is locked. The primary frequency modulation/virtual inertia response belongs to the frequency disturbance of the transient state of the power grid, and the frequency fluctuation characteristics are similar, and the method is characterized in that the load fluctuation is large, the time is short, the frequency fluctuation characteristics are frequent, and the hybrid energy storage system can completely and independently respond, so the power grid frequency deviation in the step
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And rate of change of grid frequency
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Calculated active power regulating variable
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And
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is uniformly described as
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。
When the hybrid energy storage system absorbs active power, the active power regulating quantity is judged
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Whether or not it is less than or equal to
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If so, the power type flywheel energy storage array system preferentially absorbs the active power, and further judgment is made in the process that the power type flywheel energy storage array system absorbs the active power
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Whether or not equal to
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If not, controlling the power type flywheel energy storage array system to continuously execute a primary frequency modulation/virtual inertia response instruction, namely continuously absorbing active power; if so, controlling the power type flywheel energy storage array system to exit a primary frequency modulation/virtual inertia response control mode, and enabling the energy type battery energy storage array system to enter an independent primary frequency modulation/virtual inertia response mode, namely enabling the energy type battery energy storage array system to independently absorb active power, and further judging whether the energy type battery energy storage array system independently absorbs the active power in the process of independently absorbing the active power
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Whether or not equal to
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If not, controlling the energy type battery energy storage array system to continuously absorb the active power until the frequency of the power grid returns to the dead zone, namely
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And is and
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stopping the operation; and if so, controlling the energy type battery energy storage array system to stop absorbing active power, and enabling the hybrid energy storage system to exit from the primary frequency modulation/virtual inertia response control mode and enter a locking state so as to correct the running state of the hybrid energy storage system.
It should be noted that the duration of the primary frequency modulation/virtual inertia response is much shorter than the charge-discharge capacity of the energy storage array system of the energy battery, so there is no theoretical existence
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Or
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The state of (1).
In an embodiment of the present invention, after determining the operating state of the hybrid energy storage system, the method further includes: if the hybrid energy storage system is in active power release stateThe working state of the power judges the active power regulating quantity
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Whether or not it is less than or equal to a preset power adjustment threshold
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And if so, controlling the power type flywheel energy storage array system to independently release active power, otherwise, controlling the power type flywheel energy storage array system to release the active power at full power, and simultaneously controlling the energy type battery energy storage array system to release the active power to provide power compensation.
Wherein, in the process of independently releasing active power by the control power type flywheel energy storage array system and releasing active power by the control power type flywheel energy storage array system at full power, the first electric quantity state is judged
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Whether the lower limit value of the first preset electric quantity range is reached
Figure 415068DEST_PATH_IMAGE019
If so, controlling the power type flywheel energy storage array system to stop releasing active power, and independently releasing the active power by the energy type battery energy storage array system; if the first electric quantity state
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The lower limit value of the first preset electric quantity range is not reached
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Then, the second electric quantity state is judged
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Whether the lower limit value of the second preset electric quantity range is reached
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If yes, controlling the energy type battery energy storage array system to stop releasingActive power is released, and the hybrid energy storage system is controlled to enter a locking state; if the second electric quantity state
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The lower limit value of the second preset electric quantity range is not reached
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Controlling the energy type battery energy storage array system to continuously and independently release active power until the frequency deviation of the power grid
Figure 88123DEST_PATH_IMAGE026
Greater than the lower limit of the preset frequency deviation range
Figure 521378DEST_PATH_IMAGE030
And rate of change of grid frequency
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Greater than or equal to a preset second frequency change rate threshold, wherein the second frequency change rate threshold is greater than the lower limit of the preset frequency change rate range, namely-0.2 Hz/s. In a specific embodiment, the second frequency rate-of-change threshold value is-0.15 Hz/s.
Specifically, when the hybrid energy storage system releases active power, the active power adjustment amount is judged
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Whether or not it is less than or equal to
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If so, the active power is preferentially released by the power type flywheel energy storage array system, and the active power is further judged in the process of releasing the active power by the power type flywheel energy storage array system
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Whether or not equal to
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If not, controlling the power type flywheel energy storage array system to continuously execute a primary frequency modulation/virtual inertia response instruction, namely continuously releasing active power; if so, controlling the power type flywheel energy storage array system to exit a primary frequency modulation/virtual inertia response control mode, and enabling the energy type battery energy storage array system to enter an independent primary frequency modulation/virtual inertia response mode, namely, the energy type battery energy storage array system independently releases active power, and further judging the active power release process of the energy type battery energy storage array system independently
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Whether or not equal to
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If not, controlling the energy type battery energy storage array system to continuously release active power until the frequency of the power grid returns to the dead zone, namely
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And is and
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stopping the operation; and if so, controlling the energy type battery energy storage array system to stop releasing active power, and enabling the hybrid energy storage system to exit a primary frequency modulation/virtual inertia response control mode and enter a locking state so as to correct the running state of the hybrid energy storage system.
In summary, in the embodiment of the present invention, by using the short-time high-power frequent charging and discharging characteristic of the power type flywheel energy storage array system, when the grid frequency has a short occurrence time and the load disturbance amplitude has a small fluctuation, the change of the grid frequency is preferentially responded, that is, the primary frequency modulation and the virtual inertia response are basically realized by the control of the power type flywheel energy storage array system; when the power type flywheel energy storage array system is in response to the power grid frequency for a long time and the load disturbance amplitude is large in fluctuation to cause insufficient power or insufficient SOC, the energy type electrochemical energy storage array system assists the power type flywheel energy storage array system to carry out frequency modulation, AGC frequency modulation is preferentially responded by the power type flywheel energy storage array system and the energy type electrochemical energy storage array system, and the power generation unit is matched to complete power regulation. Therefore, the technical problems that the wind power station cannot actively participate in primary frequency modulation/virtual inertia response of the power grid and cannot participate in AGC frequency modulation of the power grid when MPPT or low active power output exists are solved, and the problems that the conventional energy type battery energy storage system frequently responds to the primary frequency modulation, the virtual inertia and the AGC frequency modulation of the power grid, so that the safety and reliability are low, the service life is short and the economical efficiency is poor are solved.
According to the hybrid energy storage frequency modulation control method for the wind power station, a hybrid energy storage system is additionally arranged on the wind power station based on an advanced high-power flywheel physical energy storage technology and an energy type battery energy storage technology, so that the wind power station has the functions of responding to primary frequency modulation/virtual inertia response and AGC frequency modulation. By utilizing the short-time high-power frequent charging and discharging characteristics of the power type flywheel energy storage array system, when the power grid frequency is short in occurrence time and small in load disturbance amplitude fluctuation, the power grid frequency change is responded preferentially, namely primary frequency modulation and virtual inertia response are basically realized by the control of the power type flywheel energy storage array system; when the power type flywheel energy storage array system responds to the power grid frequency, the occurrence time is long, the load disturbance amplitude is large, and the power is insufficient or the SOC is insufficient, the energy type battery energy storage array system assists the power type flywheel energy storage array system to carry out frequency modulation, AGC frequency modulation is preferentially responded by the power type flywheel energy storage array system and the energy type battery energy storage array system, and the power regulation is completed by matching with the wind power generation unit. Therefore, the method can give full play to the technical characteristic that the power type flywheel energy storage array system can be charged and discharged frequently with short time and high power, greatly reduce the charging and discharging times of the energy type battery energy storage array system, prolong the service life of the energy type flywheel energy storage array system, reduce the charging and discharging multiplying power and depth of the energy type battery energy storage array system, greatly improve the safety and reliability, reduce the potential safety hazards of battery fire explosion and the like, improve the compensated primary frequency modulation/virtual inertia response compensation income, improve the AGC frequency modulation performance and compensation income of the wind power station, improve the frequency modulation precision, reduce the system operation and maintenance workload, improve the number of operable days, realize that the new energy station has the primary frequency modulation/virtual inertia response and AGC frequency modulation capability under the full working condition operation condition, improve the stability and the interference resistance of the wind power station accessing to the power grid, and meet the energy saving and emission reduction advocated by the country, green development and carbon neutralization development strategy.
The invention further provides a hybrid energy storage frequency modulation control device for the wind power station.
Fig. 7 is a block diagram of a hybrid energy storage frequency modulation control device for a wind power plant according to an embodiment of the present invention. The wind power station comprises a wind power generation unit and a hybrid energy storage system connected with the wind power generation unit, wherein the hybrid energy storage system comprises a power type flywheel energy storage array system and an energy type battery energy storage array system. As shown in fig. 7, the hybrid energy storage frequency modulation control apparatus 100 for a wind power plant includes: an acquisition module 110, a determination module 120, and a control module 130.
Specifically, the obtaining module 110 is configured to obtain, in real time, a power grid frequency deviation, a power grid frequency change rate, a first electric quantity state of the power type flywheel energy storage array system, and a second electric quantity state of the energy type battery energy storage array system at a grid-connected point of the wind power plant after receiving an AGC control instruction issued by the automatic power generation control system.
The judging module 120 is configured to judge whether the hybrid energy storage system meets the primary frequency modulation/virtual inertia response and AGC frequency modulation conditions according to the first electric quantity state and the second electric quantity state.
The control module 130 is configured to, when the hybrid energy storage system meets the primary frequency modulation/virtual inertia response and AGC frequency modulation conditions, control the wind farm station to enter a primary frequency modulation/virtual inertia response control mode or an AGC frequency modulation control mode according to the power grid frequency deviation and the power grid frequency change rate, so as to control the hybrid energy storage system to perform the primary frequency modulation/virtual inertia response in the primary frequency modulation/virtual inertia response control mode, or control the hybrid energy storage system and the wind power generation unit to perform the AGC frequency modulation in the AGC frequency modulation control mode; and when the hybrid energy storage system does not meet the primary frequency modulation/virtual inertia response and AGC frequency modulation conditions, controlling the hybrid energy storage system to enter a locking state so as to correct the working state of the hybrid energy storage system until the hybrid energy storage system meets the primary frequency modulation/virtual inertia response and AGC frequency modulation conditions.
In an embodiment of the present invention, the determining module 120 is specifically configured to: when the first electric quantity state is in a first preset electric quantity range and/or the second electric quantity state is in a second preset electric quantity range, determining that the hybrid energy storage system meets primary frequency modulation/virtual inertia response and AGC frequency modulation conditions; and when the first electric quantity state is not in a first preset electric quantity range and the second electric quantity state is not in a second preset electric quantity range, determining that the hybrid energy storage system does not meet primary frequency modulation/virtual inertia response and AGC frequency modulation conditions, wherein the lower limit value of the first preset electric quantity range is smaller than the lower limit value of the second preset electric quantity range, and the upper limit value of the first preset electric quantity range is larger than the upper limit value of the second preset electric quantity range.
In an embodiment of the present invention, the control module 130 controls the hybrid energy storage system to enter the primary frequency modulation/virtual inertia response control mode or the AGC frequency modulation control mode according to the grid frequency deviation and the grid frequency change rate, including: if the power grid frequency deviation exceeds a preset frequency deviation range or the power grid frequency change rate exceeds a preset frequency change rate range, controlling the wind power station to enter a primary frequency modulation/virtual inertia response control mode; and if the power grid frequency deviation does not exceed the preset frequency deviation range and the power grid frequency change rate does not exceed the preset frequency change rate range, controlling the wind power station to enter an AGC frequency modulation control mode.
In an embodiment of the present invention, in the AGC frequency modulation control mode, the control module 130 is specifically configured to: when the AGC control instruction is a load reduction control instruction, comparing the total active power of the hybrid energy storage system with a first preset active power contained in the load reduction control instruction; when the first preset active power is smaller than or equal to the total active power, controlling the hybrid energy storage system to absorb the active power independently; when the first preset active power is larger than the total active power, the hybrid energy storage system is controlled to absorb the active power at full power, and meanwhile the wind power generation unit is controlled to absorb the active power to provide power compensation.
In one embodiment of the present invention, in the process of controlling the hybrid energy storage system to absorb the active power alone and controlling the hybrid energy storage system to absorb the active power at the full power, the control module 130 is further configured to: judging whether the first electric quantity state reaches an upper limit value of a first preset electric quantity range, if so, controlling the power type flywheel energy storage array system to stop absorbing active power, and independently absorbing the active power by the energy type battery energy storage array system; if the first electric quantity state does not reach the upper limit value of the first preset electric quantity range, judging whether the second electric quantity state reaches the upper limit value of the second preset electric quantity range, if so, controlling the energy type battery energy storage array system to stop absorbing active power, and controlling the hybrid energy storage system to enter a locking state; and if the second electric quantity state does not reach the upper limit value of the second preset electric quantity range, controlling the energy type battery energy storage array system to continuously and independently absorb the active power until AGC frequency modulation corresponding to the load reduction control instruction is completed.
In controlling the wind power unit to absorb active power, the control module 130 is further configured to: judging whether the active power of the wind power generation unit is smaller than or equal to a preset power threshold value, if so, controlling the wind power generation unit to lock and adjust the power downwards; and if not, controlling the wind power generation unit to adjust the pitch angle of the fan to reduce the active power output until AGC frequency modulation corresponding to the load reduction control instruction is completed.
In an embodiment of the present invention, in the AGC tuning control mode, the control module 130 is further configured to: when the AGC control instruction is a load increasing control instruction, comparing the total active power of the hybrid energy storage system with a second preset active power contained in the load increasing control instruction; when the second preset active power is smaller than or equal to the total active power, controlling the hybrid energy storage system to independently release the active power; and when the second preset active power is larger than the total active power, controlling the hybrid energy storage system to release the active power at full power, and simultaneously controlling the wind power generation unit to release the active power to provide power compensation.
In an embodiment of the present invention, in the process of controlling the hybrid energy storage system to release the active power alone and controlling the hybrid energy storage system to release the active power at the full power, the control module 130 is further configured to: judging whether the first electric quantity state reaches a lower limit value of a first preset electric quantity range, if so, controlling the power type flywheel energy storage array system to stop releasing active power, and independently releasing the active power by the energy type battery energy storage array system; if the first electric quantity state does not reach the lower limit value of the first preset electric quantity range, judging whether the second electric quantity state reaches the lower limit value of the second preset electric quantity range, if so, controlling the energy type battery energy storage array system to stop releasing active power, and controlling the hybrid energy storage system to enter a locking state; and if the second electric quantity state does not reach the lower limit value of the second preset electric quantity range, controlling the energy type battery energy storage array system to continuously and independently release the active power until AGC frequency modulation corresponding to the load increasing control instruction is completed.
In controlling the wind power unit to release active power, the control module 130 is further configured to: judging the fan wind speed of the wind power generation unit; if the wind speed of the fan is in a first preset wind speed interval, controlling the wind power generation unit to operate in a maximum power point tracking mode; and if the wind speed of the fan is in a second preset wind speed interval, controlling the wind power generation unit to adjust the pitch angle of the fan so as to increase the active power output until AGC frequency modulation corresponding to the load increase control instruction is completed, wherein the upper limit value of the first preset wind speed interval is smaller than the lower limit value of the second preset wind speed interval.
In an embodiment of the present invention, in the primary frequency modulation/virtual inertia response control mode, the control module 130 is specifically configured to: locking the AGC control instruction, and calculating the active power regulating quantity of the hybrid energy storage system according to the power grid frequency deviation and the power grid frequency change rate; judging the working state of the hybrid energy storage system; and if the hybrid energy storage system is in a working state of absorbing active power, judging whether the active power regulating quantity is smaller than or equal to a preset power regulating quantity threshold value, if so, controlling the power type flywheel energy storage array system to absorb the active power alone, otherwise, controlling the power type flywheel energy storage array system to absorb the active power with full power, and simultaneously controlling the energy type battery energy storage array system to absorb the active power so as to provide power compensation.
The method comprises the steps that in the process that a power control type flywheel energy storage array system absorbs active power independently and the power control type flywheel energy storage array system absorbs the active power at full power, whether a first electric quantity state reaches an upper limit value of a first preset electric quantity range or not is judged, if yes, the power control type flywheel energy storage array system stops absorbing the active power, and the energy battery energy storage array system absorbs the active power independently; if the first electric quantity state does not reach the upper limit value of the first preset electric quantity range, judging whether the second electric quantity state reaches the upper limit value of the second preset electric quantity range, if so, controlling the energy type battery energy storage array system to stop absorbing active power, and controlling the hybrid energy storage system to enter a locking state; and if the second electric quantity state does not reach the upper limit value of the second preset electric quantity range, controlling the energy type battery energy storage array system to continuously and independently absorb the active power until the power grid frequency deviation is smaller than or equal to the upper limit value of the preset frequency deviation range, and the power grid frequency change rate is smaller than a preset first frequency change rate threshold value, wherein the first frequency change rate threshold value is smaller than the upper limit value of the preset frequency change rate range.
In an embodiment of the present invention, after determining the working state of the hybrid energy storage system, the control module 130 is further configured to: when the hybrid energy storage system is in a working state of releasing active power, whether the active power regulating quantity is smaller than or equal to a preset power regulating quantity threshold value or not is judged, if yes, the power type flywheel energy storage array system is controlled to release the active power alone, otherwise, the power type flywheel energy storage array system is controlled to release the active power at full power, and meanwhile, the energy type battery energy storage array system is controlled to release the active power to provide power compensation.
The method comprises the steps that in the process of independently releasing active power by a power control type flywheel energy storage array system and releasing the active power by the power control type flywheel energy storage array system at full power, whether a first electric quantity state reaches a lower limit value of a first preset electric quantity range is judged, if yes, the power control type flywheel energy storage array system stops releasing the active power, and the energy type battery energy storage array system independently releases the active power; if the first electric quantity state does not reach the lower limit value of the first preset electric quantity range, judging whether the second electric quantity state reaches the lower limit value of the second preset electric quantity range, if so, controlling the energy type battery energy storage array system to stop releasing active power, and controlling the hybrid energy storage system to enter a locking state; and if the second electric quantity state does not reach the lower limit value of the second preset electric quantity range, controlling the energy type battery energy storage array system to continuously and independently release the active power until the power grid frequency deviation is larger than the lower limit value of the preset frequency deviation range, and the power grid frequency change rate is larger than or equal to a preset second frequency change rate threshold value, wherein the second frequency change rate threshold value is larger than the lower limit value of the preset frequency change rate range.
According to the hybrid energy storage frequency modulation control device 100 for the wind power station, based on the advanced high-power flywheel physical energy storage technology and the energy type battery energy storage technology, a hybrid energy storage system is additionally arranged on the wind power station, so that the wind power station has the functions of responding to primary frequency modulation/virtual inertia response and AGC frequency modulation. By utilizing the short-time high-power frequent charging and discharging characteristics of the power type flywheel energy storage array system, when the power grid frequency is short in occurrence time and small in load disturbance amplitude fluctuation, the power grid frequency change is responded preferentially, namely primary frequency modulation and virtual inertia response are basically realized by the control of the power type flywheel energy storage array system; when the power type flywheel energy storage array system responds to the power grid frequency, the occurrence time is long, the load disturbance amplitude is large, and the power is insufficient or the SOC is insufficient, the energy type battery energy storage array system assists the power type flywheel energy storage array system to carry out frequency modulation, AGC frequency modulation is preferentially responded by the power type flywheel energy storage array system and the energy type battery energy storage array system, and the power regulation is completed by matching with the wind power generation unit. Therefore, the device can fully play the technical characteristic that the power type flywheel energy storage array system can be frequently charged and discharged with high power for a short time, greatly reduce the charging and discharging times of the energy type battery energy storage array system, prolong the service life of the energy type flywheel energy storage array system, reduce the charging and discharging multiplying power and the depth of the energy type battery energy storage array system, greatly improve the safety and the reliability, reduce the potential safety hazards of fire explosion and the like of the battery, improve the compensated primary frequency modulation/virtual inertia response compensation income, improve the AGC frequency modulation performance and the compensation income of the wind power station, improve the frequency modulation precision, reduce the operation and maintenance workload of the system, improve the number of days in operation, realize that the new energy station has the primary frequency modulation/virtual inertia response and AGC frequency modulation capability under the operating condition of the whole working condition, improve the stability and the interference resistance of the wind power station to be connected to a power grid, and meet the energy saving and emission reduction advocated by the country, green development and carbon neutralization development strategy.
It should be noted that a specific implementation manner of the hybrid energy storage frequency modulation control apparatus 100 for a wind power plant is similar to a specific implementation manner of the hybrid energy storage frequency modulation control method for a wind power plant according to any one of the above embodiments of the present invention, and please refer to the foregoing description of the method part specifically, and details are not repeated here in order to reduce redundancy.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
In the description of the present invention, "a plurality" means two or more.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (9)

1. The utility model provides a mixed energy storage frequency modulation control method for wind power station, its characterized in that, wind power station include wind power generation unit and with the mixed energy storage system that wind power generation unit is connected, mixed energy storage system includes power type flywheel energy storage array system and energy type battery energy storage array system, mixed energy storage frequency modulation control method for wind power station includes:
after an AGC control instruction issued by an automatic power generation control system is received, acquiring the power grid frequency deviation, the power grid frequency change rate, the first electric quantity state of the power type flywheel energy storage array system and the second electric quantity state of the energy type battery energy storage array system at the grid-connected point of the wind power plant station in real time;
judging whether the hybrid energy storage system meets primary frequency modulation/virtual inertia response and AGC frequency modulation conditions or not according to the first electric quantity state and the second electric quantity state;
if so, controlling the wind power station to enter a primary frequency modulation/virtual inertia response control mode or an AGC frequency modulation control mode according to the power grid frequency deviation and the power grid frequency change rate so as to control the hybrid energy storage system to perform primary frequency modulation/virtual inertia response in the primary frequency modulation/virtual inertia response control mode, or controlling the hybrid energy storage system and the wind power generation unit to perform AGC frequency modulation in the AGC frequency modulation control mode; wherein, under the primary frequency modulation/virtual inertia response control mode, the method comprises the following steps: locking the AGC control instruction, and calculating the active power regulating variable of the hybrid energy storage system according to the power grid frequency deviation and the power grid frequency change rate; judging the working state of the hybrid energy storage system; if the hybrid energy storage system is in a working state of absorbing active power, judging whether the active power regulating quantity is smaller than or equal to a preset power regulating quantity threshold value, if so, controlling the power type flywheel energy storage array system to absorb the active power alone, otherwise, controlling the power type flywheel energy storage array system to absorb the active power with full power, and simultaneously controlling the energy type battery energy storage array system to absorb the active power to provide power compensation; in the process of controlling the power type flywheel energy storage array system to absorb active power independently and controlling the power type flywheel energy storage array system to absorb active power at full power, judging whether the first electric quantity state reaches an upper limit value of a first preset electric quantity range, if so, controlling the power type flywheel energy storage array system to stop absorbing active power, and absorbing active power independently by the energy type battery energy storage array system; if the first electric quantity state does not reach the upper limit value of the first preset electric quantity range, judging whether the second electric quantity state reaches the upper limit value of the second preset electric quantity range, if so, controlling the energy type battery energy storage array system to stop absorbing active power, and controlling the hybrid energy storage system to enter the locking state; if the second electric quantity state does not reach the upper limit value of the second preset electric quantity range, controlling the energy type battery energy storage array system to continuously and independently absorb active power until the power grid frequency deviation is smaller than or equal to the upper limit value of the preset frequency deviation range, and the power grid frequency change rate is smaller than a preset first frequency change rate threshold value, wherein the first frequency change rate threshold value is smaller than the upper limit value of the preset frequency change rate range;
and if not, controlling the hybrid energy storage system to enter a locking state so as to correct the working state of the hybrid energy storage system until the hybrid energy storage system meets the primary frequency modulation/virtual inertia response and AGC frequency modulation conditions.
2. The hybrid energy storage frequency modulation control method for the wind power plant according to claim 1, wherein when the first electric quantity state is in a first preset electric quantity range and/or the second electric quantity state is in a second preset electric quantity range, it is determined that the hybrid energy storage system meets primary frequency modulation/virtual inertia response and AGC frequency modulation conditions;
and when the first electric quantity state is not in the first preset electric quantity range and the second electric quantity state is not in the second preset electric quantity range, determining that the hybrid energy storage system does not meet primary frequency modulation/virtual inertia response and AGC frequency modulation conditions, wherein the lower limit value of the first preset electric quantity range is smaller than the lower limit value of the second preset electric quantity range, and the upper limit value of the first preset electric quantity range is larger than the upper limit value of the second preset electric quantity range.
3. The hybrid energy storage frequency modulation control method for the wind power plant according to claim 2, wherein the controlling the hybrid energy storage system to enter a primary frequency modulation/virtual inertia response control mode or an AGC frequency modulation control mode according to the grid frequency deviation and the grid frequency change rate comprises:
if the power grid frequency deviation exceeds a preset frequency deviation range or the power grid frequency change rate exceeds a preset frequency change rate range, controlling the wind power station to enter the primary frequency modulation/virtual inertia response control mode;
and if the power grid frequency deviation does not exceed the preset frequency deviation range and the power grid frequency change rate does not exceed the preset frequency change rate range, controlling the wind power station to enter the AGC frequency modulation control mode.
4. The hybrid energy storage frequency modulation control method for the wind power plant according to claim 3, characterized in that in the AGC frequency modulation control mode, the method comprises:
if the AGC control instruction is a load reduction control instruction, comparing the total active power of the hybrid energy storage system with a first preset active power contained in the load reduction control instruction;
if the first preset active power is smaller than or equal to the total active power, controlling the hybrid energy storage system to independently absorb the active power;
and if the first preset active power is larger than the total active power, controlling the hybrid energy storage system to absorb the active power at full power, and simultaneously controlling the wind power generation unit to absorb the active power so as to provide power compensation.
5. The hybrid energy storage frequency modulation control method for the wind power plant according to claim 4,
in the process of controlling the hybrid energy storage system to absorb active power independently and controlling the hybrid energy storage system to absorb active power at full power, the method further comprises the following steps: judging whether the first electric quantity state reaches an upper limit value of the first preset electric quantity range, if so, controlling the power type flywheel energy storage array system to stop absorbing active power, and independently absorbing the active power by the energy type battery energy storage array system; if the first electric quantity state does not reach the upper limit value of the first preset electric quantity range, judging whether the second electric quantity state reaches the upper limit value of the second preset electric quantity range, if so, controlling the energy type battery energy storage array system to stop absorbing active power, and controlling the hybrid energy storage system to enter the locking state; if the second electric quantity state does not reach the upper limit value of the second preset electric quantity range, controlling the energy type battery energy storage array system to continuously and independently absorb active power until AGC frequency modulation corresponding to the load reduction control instruction is completed;
in the process of controlling the wind power generation unit to absorb active power, the method further comprises the following steps: judging whether the active power of the wind power generation unit is smaller than or equal to a preset power threshold value, if so, controlling the wind power generation unit to lock down and adjust the power; and if not, controlling the wind power generation unit to adjust the pitch angle of the fan so as to reduce the active power output until AGC frequency modulation corresponding to the load reduction control instruction is completed.
6. The hybrid energy storage frequency modulation control method for the wind power plant according to any one of claims 3 to 5, further comprising, in the AGC frequency modulation control mode:
if the AGC control instruction is a load increase control instruction, comparing the total active power of the hybrid energy storage system with a second preset active power contained in the load increase control instruction;
if the second preset active power is smaller than or equal to the total active power, controlling the hybrid energy storage system to independently release the active power;
and if the second preset active power is larger than the total active power, controlling the hybrid energy storage system to release the active power at full power, and simultaneously controlling the wind power generation unit to release the active power to provide power compensation.
7. The hybrid energy storage frequency modulation control method for the wind power plant according to claim 6,
in the process of controlling the hybrid energy storage system to independently release the active power and controlling the hybrid energy storage system to release the active power at full power, the method further comprises the following steps: judging whether the first electric quantity state reaches a lower limit value of the first preset electric quantity range, if so, controlling the power type flywheel energy storage array system to stop releasing active power, and independently releasing the active power by the energy type battery energy storage array system; if the first electric quantity state does not reach the lower limit value of the first preset electric quantity range, judging whether the second electric quantity state reaches the lower limit value of the second preset electric quantity range, if so, controlling the energy type battery energy storage array system to stop releasing active power, and controlling the hybrid energy storage system to enter the locking state; if the second electric quantity state does not reach the lower limit value of the second preset electric quantity range, controlling the energy type battery energy storage array system to continuously and independently release active power until AGC frequency modulation corresponding to the load increase control instruction is completed;
in the process of controlling the wind power generation unit to release active power, the method further comprises the following steps: judging the fan speed of the wind power generation unit; if the wind speed of the fan is in a first preset wind speed interval, controlling the wind power generation unit to operate in a maximum power point tracking mode; and if the wind speed of the fan is in a second preset wind speed interval, controlling the wind power generation unit to adjust the pitch angle of the fan so as to increase the active power output until AGC frequency modulation corresponding to the load increase control instruction is completed, wherein the upper limit value of the first preset wind speed interval is smaller than the lower limit value of the second preset wind speed interval.
8. The hybrid energy storage frequency modulation control method for the wind power plant according to claim 1, further comprising, after determining the working state of the hybrid energy storage system:
if the hybrid energy storage system is in a working state of releasing active power, judging whether the active power regulating quantity is smaller than or equal to a preset power regulating quantity threshold value, if so, controlling the power type flywheel energy storage array system to release the active power alone, otherwise, controlling the power type flywheel energy storage array system to release the active power at full power, and simultaneously controlling the energy type battery energy storage array system to release the active power to provide power compensation;
in the process of controlling the power type flywheel energy storage array system to independently release active power and controlling the power type flywheel energy storage array system to release the active power at full power, judging whether the first electric quantity state reaches a lower limit value of the first preset electric quantity range, if so, controlling the power type flywheel energy storage array system to stop releasing the active power, and independently releasing the active power by the energy type battery energy storage array system; if the first electric quantity state does not reach the lower limit value of the first preset electric quantity range, judging whether the second electric quantity state reaches the lower limit value of the second preset electric quantity range, if so, controlling the energy type battery energy storage array system to stop releasing active power, and controlling the hybrid energy storage system to enter the locking state; if the second electric quantity state does not reach the lower limit value of the second preset electric quantity range, the energy type battery energy storage array system is controlled to continuously and independently release active power until the power grid frequency deviation is larger than the lower limit value of the preset frequency deviation range, and the power grid frequency change rate is larger than or equal to a preset second frequency change rate threshold value, wherein the second frequency change rate threshold value is larger than the lower limit value of the preset frequency change rate range.
9. The utility model provides a mix energy storage frequency modulation controlling means for wind power station, a serial communication port, wind power station include wind power generation unit and with the mixed energy storage system that wind power generation unit connects, mixed energy storage system includes power type flywheel energy storage array system and energy type battery energy storage array system, a mix energy storage frequency modulation controlling means for wind power station includes:
the acquisition module is used for acquiring the power grid frequency deviation, the power grid frequency change rate, the first electric quantity state of the power type flywheel energy storage array system and the second electric quantity state of the energy type battery energy storage array system at the grid-connected point of the wind power plant station in real time after receiving an AGC control instruction issued by an automatic power generation control system;
the judging module is used for judging whether the hybrid energy storage system meets primary frequency modulation/virtual inertia response and AGC frequency modulation conditions according to the first electric quantity state and the second electric quantity state;
the control module is used for controlling the wind power station to enter a primary frequency modulation/virtual inertia response control mode or an AGC frequency modulation control mode according to the power grid frequency deviation and the power grid frequency change rate when the hybrid energy storage system meets primary frequency modulation/virtual inertia response and AGC frequency modulation conditions, so that the hybrid energy storage system is controlled to perform primary frequency modulation/virtual inertia response in the primary frequency modulation/virtual inertia response control mode, or the hybrid energy storage system and the wind power generation unit are controlled to perform AGC frequency modulation in the AGC frequency modulation control mode; when the hybrid energy storage system does not meet the primary frequency modulation/virtual inertia response and AGC frequency modulation conditions, controlling the hybrid energy storage system to enter a locking state so as to correct the working state of the hybrid energy storage system until the hybrid energy storage system meets the primary frequency modulation/virtual inertia response and AGC frequency modulation conditions; wherein, under the primary frequency modulation/virtual inertia response control mode, the method comprises the following steps: locking the AGC control instruction, and calculating the active power regulating variable of the hybrid energy storage system according to the power grid frequency deviation and the power grid frequency change rate; judging the working state of the hybrid energy storage system; if the hybrid energy storage system is in a working state of absorbing active power, judging whether the active power regulating quantity is smaller than or equal to a preset power regulating quantity threshold value, if so, controlling the power type flywheel energy storage array system to absorb the active power alone, otherwise, controlling the power type flywheel energy storage array system to absorb the active power with full power, and simultaneously controlling the energy type battery energy storage array system to absorb the active power to provide power compensation; in the process of controlling the power type flywheel energy storage array system to absorb active power independently and controlling the power type flywheel energy storage array system to absorb active power at full power, judging whether the first electric quantity state reaches an upper limit value of a first preset electric quantity range, if so, controlling the power type flywheel energy storage array system to stop absorbing active power, and absorbing active power independently by the energy type battery energy storage array system; if the first electric quantity state does not reach the upper limit value of the first preset electric quantity range, judging whether the second electric quantity state reaches the upper limit value of the second preset electric quantity range, if so, controlling the energy type battery energy storage array system to stop absorbing active power, and controlling the hybrid energy storage system to enter the locking state; if the second electric quantity state does not reach the upper limit value of the second preset electric quantity range, the energy type battery energy storage array system is controlled to continuously and independently absorb active power until the power grid frequency deviation is smaller than or equal to the upper limit value of the preset frequency deviation range, and the power grid frequency change rate is smaller than a preset first frequency change rate threshold value, wherein the first frequency change rate threshold value is smaller than the upper limit value of the preset frequency change rate range.
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