Wind-light-hybrid energy storage system and scheduling strategy thereof

Abstract

The invention discloses a wind-light-hybrid energy storage system scheduling strategy which comprises the following steps: firstly, monitoring a load demand P1, t of a power system; secondly, according to the real-time wind speed and the sunlight intensity, wind power real-time output Pw, t and photovoltaic power generation real-time output Ps, t are determined; and finally, comparing and calculating the load demand and the wind power and photovoltaic real-time output data, judging and scheduling the energy storage system to enter an energy storage / power generation state, and simultaneously carrying out output distribution on each energy storage system. According to the invention, the advantages of pumped storage and flywheel energy storage are combined to complement each other, power regulation and energy management on different time scales are realized, the adaptability to renewable energy fluctuation and the flexibility of peak regulation and frequency modulation are enhanced, the reliability of power supply is improved, the operation of an energy storage system and the overall performance of a power grid are optimized, and the system is suitable for popularization and application. And the abrasion of the pumping and storage unit can be reduced, and the steady-state precision performance of the pumping and storage unit is improved.

Description

Technical Field

[0001] The invention relates to a wind-solar-hybrid energy storage system and a dispatching strategy thereof, and belongs to the technical field of new energy. Background Art

[0002] New energy sources such as wind and light have significant intermittency and instability, and are greatly affected by weather and time. For large-scale new energy bases, corresponding energy storage systems must be configured to balance the volatility of new energy. Energy storage systems can not only provide peak-shaving capabilities, promote the maximum utilization of new energy, and meet the power demand during peak hours of grid load, but also quickly respond to grid frequency changes, provide necessary primary and secondary frequency regulation services, optimize the economic operation of the power system, and in the event of emergencies or emergencies, energy storage systems can be used as backup power sources to ensure the power supply of critical loads and improve the risk resistance of the power system.

[0003] Pumped-storage power stations are capable of large-scale energy conversion and are suitable for large-scale grid regulation. They are long-term energy storage systems suitable for new energy bases. However, the daily and seasonal fluctuations of wind and solar output in large-scale new energy bases are large. Pumped-storage power stations can usually only pump and generate electricity twice a day, and a single pumped-storage power station is used as energy storage. The frequency of adjusting the guide vane opening of the pumped-storage unit is very high, which increases the wear of the unit. The flywheel energy storage system can quickly respond to changes in grid demand in a short period of time, so it can complement the pumped-storage power station and be configured as a hybrid energy storage system for new energy. This hybrid energy storage system can significantly improve the response time and steady-state accuracy of the unit. Therefore, it is necessary to study a wind-solar-hybrid energy storage system and its scheduling strategy. Summary of the invention

[0004] The purpose of the present invention is to provide a wind-solar-hybrid energy storage system and a wind-solar-hybrid energy storage system scheduling strategy. The present invention combines the complementary advantages of pumped storage and flywheel energy storage, realizes power regulation and energy management on different time scales, enhances the adaptability to fluctuations in renewable energy and the flexibility of peak and frequency regulation, improves the reliability of power supply, and optimizes the operation of the energy storage system and the overall performance of the power grid.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions: a wind-solar-hybrid energy storage system, comprising: a wind power generation system, used for wind power generation and connected to the power grid through a transformer; a photovoltaic power generation system, used for photovoltaic power generation and connected to the power grid through a transformer; a pumped storage system, used for storing and releasing electricity, and connected to the power grid through a transformer; a flywheel energy storage system, used for storing and releasing electricity, and connected to the power grid through a transformer; a dispatching center, the dispatching center is respectively connected to the wind power generation system, the photovoltaic power generation system, the pumped storage system, the flywheel energy storage system, the transformer and the power grid control, responsible for receiving and processing the load demand, peak-shaving and frequency-regulating instructions and power adjustment signals of the power grid, and can further control and operate the pumped storage system and / or the flywheel energy storage system to perform external discharge or charging.

[0006] A wind-solar-hybrid energy storage system dispatching strategy includes: first monitoring the power system load demand P l,t Secondly, according to the real-time wind speed and sunshine intensity, determine the real-time wind power output P w,t and photovoltaic power generation real-time output P s,t Finally, the load demand and the real-time output data of wind power and photovoltaic power are compared and calculated, the energy storage system is judged and dispatched to enter the energy storage / power generation state, and the output of each energy storage system is distributed.

[0007] In the above-mentioned wind-solar-hybrid energy storage system dispatching strategy, the method for determining the real-time output of wind power is:

[0008] Real-time output of wind power P w,t =P wind (v);

[0009]

[0010] in:

[0011] v is the wind speed;

[0012] P wind (v) is the wind power output at wind speed v;

[0013] η wind is the efficiency of the wind turbine;

[0014] ρ is the air density;

[0015] A wind is the swept area of ​​the wind turbine;

[0016] V cut_in is the cut-in wind speed, i.e. the minimum wind speed at which power generation starts;

[0017] v ratedis the rated wind speed, i.e. the wind speed at which maximum power is achieved;

[0018] P wind_max It is the maximum output of wind power.

[0019] In the above-mentioned wind-solar-hybrid energy storage system scheduling strategy, the method for determining the real-time output of photovoltaic power generation is:

[0020] Photovoltaic power generation real-time output P s,t =P solar (I)

[0021] P solar (I) = η solar ×A solar ×I

[0022] in:

[0023] I is the sunshine intensity;

[0024] η solar the efficiency of photovoltaic panels;

[0025] P solar (I) is the photovoltaic output under sunlight intensity I.

[0026] A solar is the total area of ​​the photovoltaic panels.

[0027] The aforementioned wind-solar-hybrid energy storage system scheduling strategy, wherein the energy storage system includes a flywheel energy storage and a pumped storage energy storage power station, wherein:

[0028] Power system load P l,t First, it is borne by wind power and photovoltaic power generation output;

[0029] When P l,t ≤P w,t +P s,t , the energy storage system enters the energy storage state, and stores energy in the order of pumped storage power station and flywheel energy storage;

[0030] When P l,t >P w,t +P s,t , the energy storage system enters the discharge state, and the remaining load of the power system generates electricity in the order of flywheel energy storage and pumped storage power station.

[0031] In the above-mentioned wind-solar-hybrid energy storage system scheduling strategy, when the pumped storage power station meets the pumping conditions for energy storage, the calculation method of the pumped storage power station pumping condition power is as follows:

[0032] P ph，t =min(P w,t +P s,t -Pl,t , P pp_max )

[0033] in:

[0034] P ph，t The pumping power of the pumped storage power station;

[0035] P pp_max The maximum pumping power of the pumped-storage power station is determined by the initial technical parameters of the power station such as the unit capacity;

[0036] The pumped storage power station does not meet the pumping conditions in the following cases:

[0037] The actual water levels of the upper and lower reservoirs exceed the minimum and maximum safe water level limits;

[0038] The water head height ΔH between the upper and lower reservoirs is lower than the minimum water head height required for pumping.

[0039] In the above-mentioned wind-solar-hybrid energy storage system scheduling strategy, when the flywheel energy storage system is storing energy, the state of charge (SOC) of the current state of the flywheel energy storage determines the available adjustment capacity E. If the SOC exceeds the reasonable range, the flywheel energy storage system will not work, that is:

[0040] P FW，t =0

[0041] Otherwise, the storage power of the flywheel energy storage is:

[0042] P fy,t =min(P w，t +P s,t +P ph,t -P l,t , P FW_li )

[0043] Among them, P FW_li It is the upper limit of the energy storage power of the flywheel energy storage system, which is related to the initial system parameters such as the rated power of the motor, the maximum safe speed of the flywheel, and the system efficiency.

[0044] In the above-mentioned wind-solar-hybrid energy storage system scheduling strategy, when the flywheel energy storage system is generating electricity, the SOC of the current state of the flywheel energy storage is monitored to determine the available regulation capacity. When the SOC exceeds a reasonable range, the flywheel energy storage system does not contribute, that is:

[0045] P FW，t =0

[0046] When SOC is in a reasonable range, the flywheel energy storage real-time output P FW，t as follows:

[0047] P FW,t =min(Pl，t -P w,t -P s,t , P FW_rated )

[0048] Among them, the rated power P of the flywheel energy storage system EW_rated The calculation is done using the following formula:

[0049] P FW_rated =0.5Jω max 2

[0050] in:

[0051] J is the moment of inertia of the flywheel;

[0052] ω max is the maximum safe angular velocity of the flywheel;

[0053] After SOC reaches the upper limit of a reasonable range, the energy storage system reaches its upper limit, and the excess will result in wind and power abandonment, or increase user-side load to absorb new energy power generation.

[0054] In the aforementioned wind-solar-hybrid energy storage system and its dispatching strategy, when the pumped-storage power station meets the power generation conditions, the output of the pumped-storage power station is:

[0055] P ph，t =min((P l,t -P w,t -P s,t -P FW,t )×(1-R ps ), P ps_max )

[0056] in:

[0057] R ps is the spinning reserve ratio of the pumped storage power station, R ps 10-20% to cope with sudden load changes;

[0058] P ps_max is the rated maximum output of the pumped storage power station;

[0059] Among them, the situations that do not meet the power generation conditions are as follows:

[0060] The water level in the upper reservoir is lower than the minimum water level required for power generation or the water level in the lower reservoir exceeds the maximum safe water level;

[0061] The head difference ΔH between the upper reservoir water level and the lower reservoir water level is less than the minimum head required for power generation, resulting in the turbine being unable to generate sufficient output;

[0062] When the downstream flow rate during power generation is less than the minimum downstream flow rate, power calculation is performed based on meeting the minimum downstream flow rate. If the downstream flow rate is greater than the maximum downstream flow rate, power generation is stopped.

[0063] In the aforementioned wind-solar-hybrid energy storage system and its scheduling strategy, the reasonable range of safe operation of the flywheel energy storage SOC is 20% to 80%, avoiding overcharging or over-discharging, and ensuring the healthy operation and responsiveness of the flywheel energy storage.

[0064] Compared with the prior art, the present invention has at least the following beneficial effects:

[0065] (1) The present invention combines the complementary advantages of long-cycle, energy-type energy storage - pumped storage and short-cycle, power-type energy storage - flywheel energy storage, and realizes power regulation and energy management on different time scales.

[0066] (2) The present invention enhances the adaptability to fluctuations in renewable energy and the flexibility of peak and frequency regulation by combining multiple energy storage methods, thereby improving the reliability of power supply.

[0067] (3) The present invention optimizes the operation of the energy storage system and the overall performance of the power grid through the power grid dispatching algorithm of the dispatching center.

[0068] (4) The present invention makes full use of the rapid response and frequency regulation performance of flywheel energy storage, which can reduce the number of times the guide vane opening of the pumped storage unit is adjusted, reduce the wear of the pumped storage unit, and improve the steady-state accuracy performance of the pumped storage unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 is a flow chart of the present invention;

[0070] Figure 2 is a schematic block diagram of the present invention.

[0071] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. DETAILED DESCRIPTION

[0072] Embodiment 1 of the present invention: A wind-solar-hybrid energy storage system, comprising: a wind power generation system, used for wind power generation and connected to the power grid through a transformer; a photovoltaic power generation system, used for photovoltaic power generation and connected to the power grid through a transformer; a pumped storage system, used for storing and releasing electricity, and connected to the power grid through a transformer; a flywheel energy storage system, used for storing and releasing electricity, and connected to the power grid through a transformer; a dispatching center, which is respectively connected to the wind power generation system, the photovoltaic power generation system, the pumped storage system, the flywheel energy storage system, the transformer and the power grid control, and is responsible for receiving and processing the load demand, peak-shaving and frequency-regulating instructions and power adjustment signals of the power grid, and can further control and operate the pumped storage system and / or the flywheel energy storage system to perform external discharge or charging.

[0073] This system generates electricity through wind power generation system and photovoltaic power generation system, supplies it to the power grid system, and uses clean energy for energy sharing, which is green and environmentally friendly. At the same time, it uses pumped storage system and flywheel energy storage system for energy storage and peak regulation to improve the stability of the overall system, and uses the dispatching center for dispatching and allocation, realizing power regulation and energy management on different time scales.

[0074] Embodiment 2 of the present invention: A wind-solar-hybrid energy storage system dispatching strategy, comprising: first monitoring the power system load demand P l,t Secondly, according to the real-time wind speed and sunshine intensity, determine the real-time wind power output P w,t and photovoltaic power generation real-time output P s,t ; Finally, compare and calculate the load demand and the real-time output data of wind power and photovoltaic power, judge and dispatch the energy storage system to enter the energy storage / power generation state, and distribute the output of each energy storage system. When obtaining information, you can obtain information such as wind speed, light radiation intensity, temperature, real-time water level, etc. through local meteorological departments.

[0075] Real-time output of wind power P w,t =P wind (v) is determined as follows:

[0076]

[0077] in:

[0078] v is the wind speed;

[0079] P wind (v) is the wind power output at wind speed v;

[0080] η wind is the efficiency of the wind turbine;

[0081] ρ is the air density;

[0082] A windis the swept area of ​​the wind turbine;

[0083] V cut_in is the cut-in wind speed, i.e. the minimum wind speed at which power generation starts;

[0084] v rated is the rated wind speed, i.e. the wind speed at which maximum power is achieved;

[0085] P wind_max It is the maximum output of wind power.

[0086] Photovoltaic power generation real-time output P s,t =P solar (I), the method for determining the real-time output is:

[0087] P solar (I) = η solar ×A solar ×I

[0088] in:

[0089] I is the sunshine intensity;

[0090] η solar the efficiency of photovoltaic panels;

[0091] P solar (I) is the photovoltaic output under sunlight intensity I.

[0092] A solar is the total area of ​​the photovoltaic panels.

[0093] The energy storage system includes flywheel energy storage and pumped storage power station. The power system load P 1，t First, wind power and photovoltaic power generation will bear the responsibility; when P 1，t ≤P w，t +P s，t , the energy storage system enters the energy storage state, and stores energy in the order of pumped storage power station and flywheel energy storage; when P 1，t >P w，t +P s，t , the energy storage system enters the discharge state, and the remaining load of the power system generates electricity in the order of flywheel energy storage and pumped storage power station.

[0094] When a pumped storage power station stores energy, it is determined whether the pumped storage power station meets the pumping conditions. When the pumping conditions are met for energy storage, the calculation method of the pumped storage power station pumping condition power is as follows:

[0095] P ph，t =min(P w,t +P s,t -P l,t , P pp_max )

[0096] in:

[0097] P ph，t The pumping power of the pumped storage power station;

[0098] P pp_max The maximum pumping power of the pumped-storage power station is determined by the initial technical parameters of the power station such as the unit capacity;

[0099] Among them, the situations where pumped storage power stations do not meet the pumping conditions are as follows:

[0100] The actual water levels of the upper and lower reservoirs exceed the minimum and maximum safe water level limits;

[0101] The water head height ΔH between the upper and lower reservoirs is lower than the minimum water head height required for pumping.

[0102] When the flywheel energy storage system is storing energy, the state of charge (SOC) of the current state of the flywheel energy storage is determined to determine the available adjustment capacity E. If the SOC exceeds a reasonable range, the flywheel energy storage system does not work, that is:

[0103] P FW，t =0

[0104] Otherwise, the storage power of the flywheel energy storage is:

[0105] P fy,t =min(P w，t +P s,t +P ph,t -P l,t , P FW_li )

[0106] Among them, P FW_li It is the upper limit of the energy storage power of the flywheel energy storage system, which is related to the initial system parameters such as the rated power of the motor, the maximum safe speed of the flywheel, and the system efficiency.

[0107] When the flywheel energy storage system generates electricity, the SOC of the current state of the flywheel energy storage is monitored to determine the available regulation capacity. When the SOC exceeds the reasonable range, the flywheel energy storage system will not work, that is:

[0108] P FW，t =0

[0109] When SOC is in a reasonable range, the flywheel energy storage real-time output P FW，t as follows:

[0110] P FW,t =min(P l，t -P w,t -P s,t , P FW_rated )

[0111] Among them, the rated power P of the flywheel energy storage system FW_rated The calculation is done using the following formula:

[0112] P FW_rated =0.5Jω max 2

[0113] in:

[0114] J is the moment of inertia of the flywheel;

[0115] ω max is the maximum safe angular velocity of the flywheel;

[0116] After SOC reaches the upper limit of a reasonable range, the energy storage system reaches its upper limit, and the excess will result in wind and power abandonment, or increase user-side load to absorb new energy power generation.

[0117] When the pumped storage power station meets the power generation conditions, the output of the pumped storage power station is:

[0118] P ph，t =min((P l,t -P w,t -P s,t -P FW,t )×(1-R ps ), P ps_max )

[0119] in:

[0120] R ps is the spinning reserve ratio of the pumped storage power station, R ps 10-20% to cope with sudden load changes;

[0121] P ps_max is the rated maximum output of the pumped storage power station;

[0122] Among them, the situations that do not meet the power generation conditions are as follows:

[0123] The water level in the upper reservoir is lower than the minimum water level required for power generation or the water level in the lower reservoir exceeds the maximum safe water level;

[0124] The head difference ΔH between the upper reservoir water level and the lower reservoir water level is less than the minimum head required for power generation, resulting in the turbine being unable to generate sufficient output;

[0125] When the downstream flow rate during power generation is less than the minimum downstream flow rate, power calculation is performed based on meeting the minimum downstream flow rate. If the downstream flow rate is greater than the maximum downstream flow rate, power generation is stopped.

[0126] Specifically, the reasonable range of safe operation of flywheel energy storage SOC is 20% to 80%, avoiding overcharging or over-discharging, and ensuring the healthy operation and responsiveness of flywheel energy storage.

[0127] The working principle of an embodiment of the present invention: The power load distribution process of the system of the present invention is as follows: first, the load demand of the power system is monitored, and the load of the power system is jointly met by wind power, photovoltaics, pumped storage power stations and flywheel energy storage; secondly, the wind power and photovoltaic output are determined, and accurate data is obtained from the local meteorological department. According to the real-time wind speed and sunshine intensity, the real-time output of wind power and photovoltaics is determined; then, the working mode of the energy storage system is determined, and finally the real-time output of each part is calculated and processed and distributed.

[0128] in:

[0129] As P 1，t ≤P w，t +P s，t , the energy storage system enters the energy storage state, and stores energy in the order of pumped storage power station and flywheel energy storage. According to the constraints of the upper and lower reservoir water levels and unit capacity of the pumped storage power station, when the pumping conditions are met, the pumped storage power calculation of the pumped storage power station is further performed. According to the SOC of the current state of the flywheel energy storage, the available regulating capacity E is determined, the storage power of the flywheel energy storage is calculated, and the dispatcher distributes the output in the energy storage mode according to the calculation results;

[0130] As P 1，t >P w，t +P s，t , the energy storage system enters the discharge state, and the remaining load of the power system generates electricity in the order of flywheel energy storage and pumped storage power station; monitor the SOC of the current state of the flywheel energy storage, determine the available regulation capacity, calculate the real-time output of the flywheel energy storage, and the remaining load demand is borne by the pumped storage power station. The output of the pumped storage power station is calculated, and the output distribution under the power generation state is dispatched according to the calculation results.

Claims

1. A wind-solar-hybrid energy storage system, characterized in that: include: A wind power generation system, which is used to generate wind power and is connected to the power grid through a transformer; Photovoltaic power generation system, used for photovoltaic power generation and connected to the power grid through a transformer; Pumped storage systems, used to store and release electricity, are connected to the grid via transformers; Flywheel energy storage system, used to store and release electricity, and connected to the grid through a transformer; The dispatching center is respectively connected to the wind power generation system, photovoltaic power generation system, pumped storage system, flywheel energy storage system, transformer and power grid control, and is responsible for receiving and processing the load demand, peak-shaving and frequency-regulating instructions and power adjustment signals of the power grid, and can further control and operate the pumped storage system and / or the flywheel energy storage system to perform external discharge or charging.

2. A wind-solar-hybrid energy storage system scheduling strategy, characterized in that: include: Monitor power system load demand P l,t ; Determine the real-time wind power output P according to the real-time wind speed and sunshine intensity. w,t and photovoltaic power generation real-time output P s,t ; Compare and calculate the load demand and the real-time output data of wind power and photovoltaic power, judge and dispatch the energy storage system to enter the energy storage / power generation state, and distribute the output of each energy storage system.

3. A wind-solar-hybrid energy storage system scheduling strategy according to claim 2, characterized in that: The method for determining the real-time output of wind power is: Real-time output of wind power P w,t =P wind (v); in: v is the wind speed; P wind (v) is the wind power output at wind speed v; η wind is the efficiency of the wind turbine; ρ is the air density; A wind is the swept area of ​​the wind turbine; V cut_in is the cut-in wind speed, i.e. the minimum wind speed at which power generation starts; v rated is the rated wind speed, i.e. the wind speed at which maximum power is achieved; P wind_max It is the maximum output of wind power.

4. A wind-solar-hybrid energy storage system scheduling strategy according to claim 2, characterized in that: The method for determining the real-time output of photovoltaic power generation is: Photovoltaic power generation real-time output P s,t =P solar (I) P solar (I)=the solar ×A solar ×I in: I is the sunshine intensity; η solar the efficiency of photovoltaic panels; P solar (I) is the photovoltaic output under sunlight intensity I. A solar is the total area of ​​the photovoltaic panels.

5. A wind-solar-hybrid energy storage system scheduling strategy according to claim 2, characterized in that: The energy storage system includes a flywheel energy storage and a pumped storage power station, wherein: When P l,t ≤P w,t +P s,t , the energy storage system enters the energy storage state, and stores energy in the order of pumped storage power station and flywheel energy storage; When P l,t >P w,t +P s,t , the energy storage system enters the discharge state, and the remaining load of the power system generates electricity in the order of flywheel energy storage and pumped storage power station.

6. A wind-solar-hybrid energy storage system scheduling strategy according to claim 5, characterized in that: When the pumped storage power station meets the pumping conditions for energy storage, the calculation method of the pumped storage power station pumping condition power is as follows: P ph，t =min(P w,t +P s,t -P l,t ,P pp_max ) in: P ph，t The pumping power of the pumped storage power station; P pp_max The maximum pumping power of the pumped-storage power station is determined by the initial technical parameters of the power station such as the unit capacity; The pumped storage power station does not meet the pumping conditions as follows: The actual water levels of the upper and lower reservoirs exceed the minimum and maximum safe water level limits; The water head height ΔH between the upper and lower reservoirs is lower than the minimum water head height required for pumping.

7. A wind-solar-hybrid energy storage system scheduling strategy according to claim 6, characterized in that: When the flywheel energy storage system is storing energy, the state of charge (SOC) of the current state of the flywheel energy storage determines the available adjustment capacity E. If the SOC exceeds the reasonable range, the flywheel energy storage system does not work, that is: P PW，t ＝0 Otherwise, the storage power of the flywheel energy storage is: P fy,t =min(P w,t +P s,t +P ph,t -P l,t ,P FW_li ) Among them, P FW_li It is the upper limit of the energy storage power of the flywheel energy storage system, which is related to the initial system parameters such as the rated power of the motor, the maximum safe speed of the flywheel, and the system efficiency.

8. A wind-solar-hybrid energy storage system scheduling strategy according to claim 5, characterized in that: When the flywheel energy storage system generates electricity, the SOC of the current state of the flywheel energy storage is monitored to determine the available regulation capacity. When the SOC exceeds a reasonable range, the flywheel energy storage system does not generate electricity, that is: P FW，t ＝0 When SOC is in a reasonable range, the flywheel energy storage real-time output P FW，t as follows: P FW,t =min(P l,t -P w,t -P s,t ,P FW_rated ) Among them, the rated power P of the flywheel energy storage system FW_rated The calculation is done using the following formula: P FW_rated =0.5Jω max 2 in: J is the moment of inertia of the flywheel; ω max is the maximum safe angular velocity of the flywheel.

9. A wind-solar-hybrid energy storage system scheduling strategy according to claim 8, characterized in that: When the pumped storage power station meets the power generation conditions, the output of the pumped storage power station is: P ph，t =min((P l,t -P w,t -P s,t -P FW,t )×(1-R ps ),P ps_max ) in: R ps is the spinning reserve ratio of the pumped storage power station, R ps 10-20%; P ps_max is the rated maximum output of the pumped storage power station; Among them, the situations that do not meet the power generation conditions are as follows: The water level in the upper reservoir is lower than the minimum water level required for power generation or the water level in the lower reservoir exceeds the maximum safe water level; The head difference ΔH between the upper reservoir water level and the lower reservoir water level is less than the minimum head required for power generation, resulting in the turbine being unable to generate sufficient output; When the downstream flow rate during power generation is less than the minimum downstream flow rate, power calculation is performed based on meeting the minimum downstream flow rate. If the downstream flow rate is greater than the maximum downstream flow rate, power generation is stopped.

10. A wind-solar-hybrid energy storage system scheduling strategy according to claim 7 or 8, characterized in that: The reasonable range of safe operation of the flywheel energy storage SOC is 20% to 80%.

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