CN117081154A - Energy-storage in-situ large island system of offshore wind turbine and control method - Google Patents
Energy-storage in-situ large island system of offshore wind turbine and control method Download PDFInfo
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- CN117081154A CN117081154A CN202311060070.1A CN202311060070A CN117081154A CN 117081154 A CN117081154 A CN 117081154A CN 202311060070 A CN202311060070 A CN 202311060070A CN 117081154 A CN117081154 A CN 117081154A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 121
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 25
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- 238000010248 power generation Methods 0.000 claims description 15
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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
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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Abstract
The invention relates to an energy storage in-situ large island system of an offshore wind turbine and a control method. The large island system of the offshore wind turbine comprises a wind turbine, an energy storage system, a turbine boosting transformer, an auxiliary transformer, a circuit breaker and an on-site control system; the energy storage system can switch three working modes of grid-connected charging, grid-connected discharging and off-grid discharging by receiving instructions of the local control system. The beneficial effects of the invention include: the large island system of the energy-storage in-situ offshore wind turbine is provided, and the functions of the large island system and the energy-storage system are achieved, so that engineering investment is reduced; the energy storage system is integrated with a fan for monitoring, so that grid-connected control is simplified; and an energy storage system is adopted to replace diesel engine, so that the operation reliability is improved.
Description
Technical Field
The invention is suitable for the field of wind power generation, and particularly relates to an energy storage on-site large island system of an offshore wind turbine and a control method.
Background
At present, electric energy generated by an offshore wind turbine generator is boosted to 35kV or 66kV and then collected in an offshore booster station, and the electric energy is accessed to an onshore centralized control center through a high-voltage submarine cable and is accessed to a system transformer substation through an overhead line. In the debugging stage of the offshore booster station, or in the case of high-voltage cable faults, power grid outage faults, main transformer fault outage and the like, the wind turbine generator set does not generate electricity, the wind power plant does not transmit power outwards, the booster station is connected with the fan set string, the wind power plant is in a large island operation mode, and auxiliary equipment (such as a heating and dehumidifying device and the like) in the wind power generator needs to be powered by a large island system. In addition, along with rapid expansion of offshore wind power to deep sea, application of the large-capacity offshore wind turbine is becoming wide, under typhoon working conditions, yaw motors of the type of wind turbine need to be adjusted to conduct active anti-stage so as to improve anti-stage capacity of the wind turbine, mechanical damage of blades is avoided, and by combining with DLC6.2 regulation, a backup power supply has yaw adjustment capacity of at least 6 hours, and yaw system power of a fan is generally about 75 kW. Because extreme weather such as typhoons is likely to cause large island operation conditions, the power supply requirement of a yaw system is also considered by a large island system of the offshore wind farm. At present, a large island system in China mainly considers two modes, namely, a diesel generator matched with an offshore wind turbine is used as a power supply of the large island system, and a diesel generator is built at an offshore booster station to supply power for the offshore wind turbine in a large island operation mode.
According to the requirements of documents such as the power system safety and stability guide rule GB 38755 and the grid-connected power supply primary frequency modulation technical regulation and the test guide rule GB/T40595, an energy storage system is required to be built in a matched mode for meeting the primary frequency modulation requirement of a local power grid, a centralized energy storage system is generally built in a land centralized control center, the energy storage capacity is configured according to the installed capacity of 6-20% and the time length of 1-4 h, and the wind power plant is specifically executed according to the local policy requirement.
The traditional offshore wind farm needs to be respectively provided with a large island system and a centralized energy storage system of a diesel engine, so that the investment is large; the energy storage system and the fan monitoring system need to be controlled independently, and the complexity is high; the offshore equipment has higher requirements on starting reliability, such as the starting failure of a diesel generator, and the running risk of the wind farm under extreme working conditions is greatly improved.
Disclosure of Invention
The invention aims to provide an energy-storage in-situ large island system of an offshore wind turbine, aiming at the defects in the background art. For this purpose, the invention adopts the following technical scheme:
an energy storage on-site large island system of an offshore wind turbine, which is characterized in that: the system comprises a wind turbine generator, an energy storage system, a turbine generator boosting transformer, an auxiliary transformer, a circuit breaker and an on-site control system; the circuit breaker comprises a wind turbine generator set outlet circuit breaker QF1, an energy storage system outlet circuit breaker QF2, a generator set boosting low-voltage circuit breaker QF3 and an auxiliary transformer high-voltage circuit breaker QF4; the on-site control system is in communication connection with the wind turbine generator, the energy storage system, the turbine generator boosting transformer, the auxiliary transformer and the circuit breaker, controls the working state of the wind power generation system, is in communication connection with the wind power plant, and is provided with a remote control background in a central control room of a land centralized control center, and the remote control background is in communication connection with the on-site control system and receives the running information of the wind power plant;
the energy storage system can switch three working modes of grid-connected charging, grid-connected discharging and off-grid discharging by receiving instructions of the local control system.
Further, the energy storage system is installed on the outer platform of the tower barrel of the wind turbine generator in situ.
Further, the energy storage system comprises a storage battery and a converter PCS, the energy storage system is in a prefabricated cabin mode and is installed on a tower outer platform of the wind turbine generator in a local mode, the storage battery is arranged in the storage battery cabin, and the converter PCS is arranged in the PCS cabin.
Further, the capacity of the energy storage system is s=max { k b t b P GN ,S L -wherein:
k b ,t b the energy storage device occupies the proportion of the installed capacity and the energy storage time length requirement (determined according to the local power grid requirement) respectively; p (P) GN The installed capacity of the wind farm; p (P) GN Rated value S for active power of wind turbine generator L The power consumption requirements of wind turbine auxiliary equipment and a yaw system for supplying power for set time are met.
The second aim of the invention is to provide a control method of the large island system of the offshore wind turbine based on the energy storage in-situ generation aiming at the defects in the background technology. For this purpose, the invention adopts the following technical scheme:
the control method of the energy-storage in-situ large island system of the offshore wind turbine generator is characterized by comprising the following steps of:
1) Collecting the running states of a wind turbine, an energy storage system, a turbine boosting transformer, an auxiliary transformer and a circuit breaker, and receiving signals which are transmitted to a local control system by a remote control background;
2) According to the wind farm operation information collected in the step 1) and signals sent by a remote control background, the local control system sends action instructions to the wind turbine generator, the energy storage system and the circuit breaker, and specific action logic is as follows:
a) The wind power plant generates power and runs in a grid-connected mode, an outlet breaker QF1 of the wind power plant, an outlet breaker QF2 of the energy storage system, a boosting low-voltage breaker QF3 of the wind power plant and an auxiliary transformer high-voltage breaker QF4 are all closed, the energy storage system is in a grid-connected charging mode, the generated energy of the wind power plant is used for charging the energy storage system and auxiliary power utilization of a fan, and the residual electric energy is fed out through a current collecting submarine cable and then is grid-connected;
b) When a wind power plant receives a primary frequency modulation instruction of the wind power plant, an outlet breaker QF1 of the wind power plant, an outlet breaker QF2 of an energy storage system, a boosting low-voltage breaker QF3 of the wind power plant and a high-voltage breaker QF4 of an auxiliary transformer are all closed, the energy storage system is in a grid-connected discharging mode, an on-site control system responds to an active adjustment instruction by controlling the energy storage system and the wind power plant, the wind power plant and the energy storage system can generate power for auxiliary power consumption of a fan, and the residual power is transmitted through a current collecting sea cable and then is grid-connected;
c) When the wind power plant is off-grid, stopping generating electricity, opening an outlet breaker QF1 of the wind power generation set, an outlet breaker QF2 of the energy storage system, a boosting low-voltage breaker QF3 of the wind power generation set and an auxiliary transformer high-voltage breaker QF4, wherein the energy storage system is in an off-grid discharging mode, and the energy generated by the energy storage system can be used for auxiliary electricity utilization of a fan;
d) When the wind power plant receives a signal that typhoons come in, the auxiliary transformer supplies power for auxiliary equipment and a yaw system, and the wind power plant enters an active anti-platform mode;
3) Executing action instructions of the local control system by the wind turbine generator, the energy storage system and the circuit breaker, and adjusting the working state of the large island system;
4) Cycling steps 1) to 3).
Further, in the step 2), the power control function of the large island system:
P(t+Δt)＝P(t)+ΔP(t)
P(t)＝k 1 (t)P G (t)+k 2 (t)P B (t)+k 3 (t)P L (t)
0≤P G (t)≤P GN ,0.1P G (t)≤ΔP(t)≤0.06P G (t),
wherein:
p (t) and P (t+Deltat) are respectively power target values at the moment t and the moment t+Deltat of the wind power generation system;
P G (t)、P B (t)、P L (t) is the active power of the wind turbine generator set at the moment t, the active power of the energy storage system and the active power of the load of the auxiliary transformer (4) respectively;
P GN the method comprises the steps of setting an active power rated value for a wind turbine generator;
k 1 (t)、k 2 (t)、k 3 and (t) is a wind power plant operation state parameter at the moment t, namely a working mode coefficient of the large island system, and the value of the working mode coefficient is as follows:
ΔP (t) is a t moment in-situ control system active power variation instruction value;
when the required power is reduced (delta P (t) < 0), the power generated by the wind turbine is preferentially consumed by the energy storage system, and the power shortage is reduced by reducing the power generated by the wind turbine; when the power of the large island instruction is required to rise (delta P (t) is more than or equal to 0), the wind turbine generator maintains the maximum output, and the active lack is supplemented by the energy storage system.
The beneficial effects of the invention include:
aiming at the problem that the investment of the large island system of the diesel engine and the centralized energy storage system is large in the traditional offshore wind farm, the large island system of the offshore wind turbine in-situ energy storage is provided, and meanwhile, the large island system and the energy storage system are provided, so that the engineering investment is reduced.
Aiming at the condition that the traditional centralized energy storage system of the offshore wind farm and the fan monitoring system are controlled separately, the energy storage system can be integrated into the fan monitoring system for unified management, so that the complexity of grid-connected control of the offshore wind farm is reduced.
Aiming at the condition that a diesel generator is adopted for a large island system and has a starting failure, an energy storage system is adopted as a large island power supply, so that the operation reliability is improved;
under typhoon working conditions, the energy storage system can provide a backup power supply for the yaw motor, so that active anti-typhoon is realized.
Drawings
FIG. 1 is a schematic diagram of main wiring of an energy storage in-situ large island system of an offshore wind turbine.
FIG. 2 is a plan layout view of the energy storage in-situ large island system of the offshore wind turbine.
Fig. 3 is a schematic diagram of an in-situ control system connection of an energy-storage in-situ offshore wind turbine large island system.
Fig. 4 is a control flow chart of the energy storage in-situ large island system of the offshore wind turbine.
Fig. 5 is a schematic diagram of connection between an in-situ control system and a central control system of an in-situ energy storage offshore wind turbine large island system.
Detailed Description
The invention is described in further detail below with reference to the drawings and to specific embodiments.
As shown in fig. 1: the invention provides an energy-storage in-situ large island system of an offshore wind turbine, which comprises a wind turbine 1, an energy storage system 2, a turbine boosting transformer 3, an auxiliary transformer 4, a circuit breaker 5 and an in-situ control system 6. The circuit breaker 5 comprises a wind turbine generator set outlet circuit breaker QF1 (with the reference numeral of 5-1), an energy storage system outlet circuit breaker QF2 (with the reference numeral of 5-2), a generator set boosting low-voltage circuit breaker QF3 (with the reference numeral of 5-3) and an auxiliary transformer high-voltage circuit breaker QF4 (with the reference numeral of 5-4). The on-site control system 6 is in communication connection with the wind turbine generator 1, the energy storage system 2, the turbine generator boosting transformer 3, the auxiliary transformer 4 and the circuit breaker 5 (a motor unit outlet circuit breaker QF1, an energy storage system outlet circuit breaker QF2, a turbine generator boosting low-voltage circuit breaker QF3 and an auxiliary transformer high-voltage circuit breaker QF 4) through control cables or network cables, controls the working state of the wind power generation system, is in communication connection with a wind farm, and is provided with a remote control background 7 in a central control room of a land centralized control center, the remote control background 7 is in communication connection with the on-site control system 6, receives wind farm operation information, and the on-site control system 6 can be implemented by adopting PLC equipment or other controllers capable of programming and sending instructions.
As shown in fig. 5: the local control system 6 is connected to the offshore booster station convergence switch 8 in a double-ring network optical fiber communication mode, the offshore booster station convergence switch 8 is connected to the optical transmission equipment 9 through a network cable, the optical transmission equipment 9 is connected to the remote control background 7 through the network cable, and then the connection between the remote control background 7 and each local control unit 6 is realized.
The energy storage system 2 comprises a storage battery 2-1 and a converter PCS (reference numeral 2-2), and three working modes of grid-connected charging, grid-connected discharging and off-grid discharging can be switched by receiving an instruction of the local control system 6.
The capacity of the energy storage system 2 is s=max { k b t b P GN ,S L -wherein:
k b ,t b the energy storage device occupies the proportion of the installed capacity and the energy storage time length requirement (determined according to the local power grid requirement) respectively; p (P) GN The method comprises the steps of setting an active power rated value for a wind turbine generator; s is S L To meet the power requirements of wind turbine auxiliary equipment and yaw systems supplied with power for a set time (such as 6 hours).
Taking a certain 504MW offshore wind farm in Zhejiang province as an example, 56 9MW wind turbines are built in the wind farm, and the capacity of the energy storage system of the large island system provided by the invention is calculated:
(1) According to the project location policy requirements, an energy storage device is configured according to the capacity of 6% of the wind farm, and the energy storage time is considered for 1 h. The planning capacity of the energy storage system of each wind turbine generator system is calculated to be 540kW/540kWh
(2) The backup power supply system is mainly used for guaranteeing that a unit can normally yaw and supplying power for auxiliary equipment under the condition that a power grid is powered off during typhoons. According to a wind turbine generator backup power load statistical table:
a. load long-term operating capacity
Total active power of motor load
Pm= (4×12+2.2) ×1/0.79=63.5 kW (efficiency 0.79)
Total active power of static load
Pj= (3+1.2+2.5+6) 0.7 0.8+7.2=14.3 kW (while coefficient 0.7, power factor 0.8, consider pitch charging power)
Motor load total reactive qm= (74.6+5.8) 2-63.52=49.3 kVar (power factor at run time taken to be 0.8)
Total reactive qj= (3+1.2+2.5+6) ×0.6=7.62 kVar (power factor 0.8 at run time)
Load total active pc=63.5+14.3=77.8 kW during continuous operation
Load total reactive qc=49.3+7.6=56.9 kVar during continuous operation
Continuous operation load total apparent power sc=96.4 kVA (variable pitch charging power)
b. Capacity required for load start
Total apparent power when starting motor
Sm1=7x74.6+5.8=528 kVA (start current multiple taken 7, consider hydraulic pump motor and yaw motor not started at the same time)
Motor load total active PM1 = 7 x 74.6 x 0.5+2.2/0.79 = 264kW at start (power factor at start 0.5)
Motor load total reactive qm1=5282-2642= 457.3kVar at start-up
The total active power of the load at start-up PC1 = 264+14.3 = 278.3kW
Load total reactive power qc1=457.3+5.3= 464.9kVar at start-up
Total apparent power of load at start-up sc1=541.8 kVAc, 6 hours demand for power generator start-up power and standby
The energy storage configuration power is 550kW, the continuous power supply load is calculated according to 80kW (the load with the remark of V in the table), the energy storage discharge efficiency is 85%, and the configuration capacity is 80/0.85 x 6=565 kWh.
(3) According to the calculation results of (1) and (2), the capacity of the energy storage system of the large island system provided by the invention is 565kWh.
As shown in fig. 2: the energy storage system 2 is in a prefabricated cabin form, is installed on a tower outer platform of the wind turbine generator system 1 in situ, the storage battery 2-1 is arranged in the storage battery cabin, and the PCS (reference numeral 2-2) is arranged in the PCS cabin; the unit boosting transformer 3, the auxiliary transformer 4, the circuit breaker 5 and the local control system 6 are arranged on a platform in a tower barrel of the wind turbine unit 1.
As shown in fig. 3: the on-site control system 6 is connected to all components of the wind power generation system through control cables or network cables, and comprises a wind turbine generator 1, an energy storage system 2, a turbine generator boosting transformer 3, an auxiliary transformer 4 and a breaker 5 for controlling the working state of the wind power generation system, wherein the breaker 5 comprises a wind turbine generator outlet breaker QF1 (with the reference numeral of 5-1), an energy storage system outlet breaker QF2 (with the reference numeral of 5-2), a turbine generator boosting transformer low-voltage breaker QF3 (with the reference numeral of 5-3) and an auxiliary transformer high-voltage breaker QF4 (with the reference numeral of 5-4), and meanwhile, a remote control background 7 arranged in a central control room of the land centralized control center is in communication connection with the on-site control system 6 through wind power field optical fiber communication for receiving wind power plant operation information.
As shown in fig. 4: the control method of the energy storage in-situ large island system of the offshore wind turbine mainly comprises the following steps:
1) The local control system 6 collects the running states of the wind turbine 1, the energy storage system 2, the turbine boosting transformer 3, the auxiliary transformer 4 and the circuit breaker 5 and receives signals which are transmitted to the local control system 6 by the remote control background 7;
2) According to the wind farm operation information collected in the step 1) and the signals sent by the remote control 7, the local control system 6 sends action instructions to the wind turbine generator 1, the energy storage system 2 and the circuit breaker 5. The specific action logic is as follows:
a) When the wind power plant generates electricity and runs in a grid-connected mode, QF1 (with the reference number of 5-1), QF2 (with the reference number of 5-2), QF3 (with the reference number of 5-3) and QF4 (with the reference number of 5-4) are all closed, the energy storage system 2 is in a grid-connected charging mode, the wind power generation set can be used for charging the energy storage system, the auxiliary power of the fan is used, and the residual power is transmitted through the current collecting sea cable and then is connected in a grid.
b) When the wind farm receives a primary frequency modulation instruction of the wind farm, QF1 (with the reference number of 5-1), QF2 (with the reference number of 5-2), QF3 (with the reference number of 5-3) and QF4 (with the reference number of 5-4) are all closed, the energy storage system 2 is in a grid-connected discharging mode, the local control system 6 responds to an active adjustment instruction by controlling the energy storage system 2 and the wind turbine generator 1, the wind turbine generator and the energy storage system generate power for auxiliary power utilization of a fan, and the residual power is transmitted out through a current collecting submarine cable and then grid-connected.
c) When the wind power plant is off-grid, power generation is stopped, QF2 (with the reference number of 5-2) and QF4 (with the reference number of 5-4) are closed, QF1 (with the reference number of 5-1) and QF3 (with the reference number of 5-3) are opened, the energy storage system 2 is in an off-grid discharging mode, and power generated by the energy storage system can be used for auxiliary power utilization of a fan.
d) When the wind farm receives a signal that typhoons come, the auxiliary transformer 4 supplies power for auxiliary equipment and a yaw system, and the wind turbine 1 enters an active anti-platform mode.
3) And the wind turbine generator system 1, the energy storage system 2 and the circuit breaker 5 execute action instructions of the local control system 6 to adjust the working state of the large island system.
4) Cycling steps 1) to 3).
Further, in the step 2), the power control function of the large island system:
P(t+Δt)＝P(t)+ΔP(t)
P(t)＝k 1 (t)P G (t)+k 2 (t)P B (t)+k 3 (t)P L (t)
0≤P G (t)≤P GN ,0.1P G (t)≤ΔP(t)≤0.06P G (t),
wherein:
p (t) and P (t+Deltat) are respectively power target values at the moment t and the moment t+Deltat of the wind power generation system;
P G (t)、P B (t)、P L (t) respectively obtaining active power of the wind turbine generator 1, active power of the energy storage system 2 and active power of the load of the auxiliary transformer 4 at the moment t;
P GN the active power rating of the wind turbine generator 1;
k 1 (t)、k 2 (t)、k 3 and (t) is a wind power plant operation state parameter at the moment t, namely a working mode coefficient of the large island system, and the value of the working mode coefficient is as follows:
Δp (t) is the active power variation command value of the local control system 6 at time t;
when the required power is reduced (delta P (t) < 0), the power generated by the wind turbine generator 1 is preferentially consumed by the energy storage system 2, and the power shortage is reduced by reducing the power generated by the wind turbine generator 1; when the power of the large island instruction is required to rise (delta P (t) is more than or equal to 0), the wind turbine generator 1 maintains the maximum output, and the active power shortage is supplemented by the energy storage system 2.
The above embodiments are merely examples of the present invention, but the present invention is not limited thereto, and any changes or modifications made by those skilled in the art are included in the scope of the present invention.
Claims (6)
1. An energy storage on-site large island system of an offshore wind turbine, which is characterized in that: the system comprises a wind turbine generator (1), an energy storage system (2), a turbine generator boosting transformer (3), an auxiliary transformer (4), a circuit breaker (5) and an on-site control system (6); the circuit breaker (5) comprises a wind turbine generator set outlet circuit breaker QF1 (5-1), an energy storage system outlet circuit breaker QF2 (5-2), a generator set boosting low-voltage circuit breaker QF3 (5-3) and an auxiliary transformer high-voltage circuit breaker QF4 (5-4); the on-site control system (6) is in communication connection with the wind turbine generator system (1), the energy storage system (2), the turbine generator system boosting transformer (3), the auxiliary transformer (4) and the circuit breaker (5), controls the working state of the wind power generation system, is in communication connection with a wind power plant, and is provided with a remote control background (7) in a central control room of a land centralized control center, and the remote control background (7) is in communication connection with the on-site control system (6) to receive the running information of the wind power plant;
the energy storage system (2) can switch three working modes of grid-connected charging, grid-connected discharging and off-grid discharging by receiving instructions of the local control system (6).
2. The energy-storage in-situ large island system of the offshore wind turbine generator set, which is characterized in that the energy-storage system (2) is installed on an in-situ platform outside a tower barrel of the wind turbine generator set (1).
3. The energy-storage on-site large island system of the offshore wind turbine generator set according to claim 1, wherein the energy-storage system (2) comprises a storage battery (2-1) and a converter PCS (2-2), the energy-storage system (2) is in a prefabricated cabin form and is installed on an outer platform of a tower drum of the wind turbine generator set (1) in an on-site mode, the storage battery (2-1) is arranged in a storage battery cabin, and the converter PCS (2-2) is arranged in a PCS cabin.
4. The energy-storage in-situ large island system of the offshore wind turbine according to claim 1, wherein the capacity of the energy storage system (2) is s=max { k b t b P GN ,S L -wherein:
k b ,t b the energy storage device occupies the proportion of the installed capacity and the energy storage time length requirement respectively; p (P) GN The installed capacity of the wind farm; p (P) GN Rated value S for active power of wind turbine generator L The power consumption requirements of wind turbine auxiliary equipment and a yaw system for supplying power for set time are met.
5. The control method of the energy-storage in-situ large island system of the offshore wind turbine of any one of claims 1 to 4, comprising the following steps:
the method comprises the steps of 1) collecting running states of a wind turbine (1), an energy storage system (2), a turbine boosting transformer (3), an auxiliary transformer (4) and a circuit breaker (5), and receiving signals from a remote control background (7) to a local control system (6);
2) According to the wind farm operation information collected in the step 1) and signals sent by a remote control background (7), an on-site control system (6) sends action instructions to a wind turbine generator (1), an energy storage system (2) and a circuit breaker (5), and specific action logic is as follows:
a) The wind power plant generates power and runs in a grid-connected mode, a wind power generation set outlet breaker QF1 (5-1), an energy storage system outlet breaker QF2 (5-2), a set boosting low-voltage breaker QF3 (5-3) and an auxiliary transformer high-voltage breaker QF4 (5-4) are all closed, the energy storage system (2) is in a grid-connected charging mode, the wind power generation set can be used for charging the energy storage system and auxiliary power consumption of a fan, and the residual electric energy is transmitted through a current collecting submarine cable and then is grid-connected;
b) When a wind power plant receives a wind power plant primary frequency modulation instruction, an outlet breaker QF1 (5-1) of the wind power plant, an outlet breaker QF2 (5-2) of the energy storage system, a unit boosting low-voltage breaker QF3 (5-3) and an auxiliary transformer high-voltage breaker QF4 (5-4) are all closed, the energy storage system (2) is in a grid-connected discharging mode, an on-site control system (6) responds to an active power adjustment instruction by controlling the energy storage system (2) and the wind power plant (1), the wind power plant and the energy storage system generate power for auxiliary power consumption of a fan, and the residual power is transmitted through a current collecting sea cable and then is grid-connected;
c) When the wind power plant is off-grid, stopping generating electricity, opening a wind power unit outlet breaker QF1 (5-1), an energy storage system outlet breaker QF2 (5-2), a unit boosting low-voltage breaker QF3 (5-3) and an auxiliary transformer high-voltage breaker QF4 (5-4), wherein the energy storage system (2) is in an off-grid discharging mode, and the energy generated by the energy storage system can be used for fan auxiliary electricity;
d) When a wind farm receives a signal that typhoons come, an auxiliary transformer (4) supplies power for auxiliary equipment and a yaw system, and a wind turbine generator system (1) enters an active anti-typhoon mode;
3) The wind turbine generator system (1), the energy storage system (2) and the circuit breaker (5) execute action instructions of the local control system (6) to adjust the working state of the large island system;
4) Cycling steps 1) to 3).
6. The control method according to claim 5, wherein in the step 2), the power control function of the large island system:
P(t+Δt)＝P(t)+ΔP(t)
P(t)＝k 1 (t)P G (t)+k 2 (t)P B (t)+k 3 (t)P L (t)
0≤P G (t)≤P GN ，0.1P G (t)≤ΔP(t)≤0.06P G (t)，
wherein:
p (t) and P (t+Δt) are power target values at the time t and t+Δt of the wind power generation system respectively;
P G (t)、P B (t)、P L (t) is the active power of the wind turbine generator system (1), the active power of the energy storage system (2) and the active power of the load of the auxiliary transformer (4) at the moment t respectively;
P GN the method is characterized by comprising the steps of (1) setting an active power rated value for a wind turbine generator;
k 1 (t)、k 2 (t)、k 3 and (t) is a wind power plant operation state parameter at the moment t, namely a working mode coefficient of the large island system, and the value of the working mode coefficient is as follows:
Δp (t) is the active power variation command value of the local control system (6) at time t;
when the required power is reduced, the power generated by the wind turbine generator system (1) is preferentially consumed by the energy storage system (2), and the power shortage is reduced by reducing the power generated by the wind turbine generator system (1); when the power of the large island instruction is required to rise, the wind turbine generator system (1) maintains the maximum output, and the active power shortage is supplemented by the energy storage system (2).
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