A wind-solar power station active power control method and device

Abstract

The application provides a wind-solar power station active power control method and device. The method comprises the following steps: obtaining grid dispatch instruction power and wind-solar maximum available power; when the grid dispatch instruction power is greater than the wind-solar maximum available power, taking the wind power maximum available power as a first wind power instruction power; determining a first photovoltaic instruction power according to the photovoltaic maximum available power, wherein the photovoltaic maximum available power is the sum of the first photovoltaic instruction power and a reserved power; obtaining a first grid connection point power at a previous moment and a second grid connection point power at a current moment; if the difference between the first grid connection point power and the second grid connection point power is greater than a preset value, determining a second photovoltaic instruction power according to the difference and the reserved power, wherein the sum of the first photovoltaic instruction power and the second photovoltaic instruction power is a final photovoltaic instruction power; and controlling the wind-solar power station according to the first wind power instruction power and the final photovoltaic instruction power. Through the application, the wind-solar power station active power is smoothed, and wind-solar fluctuation is inhibited.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the field of new energy, in particular to a wind-solar station active power control method and device. BACKGROUND

[0002] With the large access of new energy, its volatility, randomness and intermittence characteristics bring great challenges to the safety and stability of the power grid, and the demand of the power grid for the smooth output of new energy power is becoming more and more urgent.

[0003] The wind power station and the photovoltaic power station receive the dispatch of the power grid independently, due to their natural volatility, randomness and intermittence characteristics, especially the wind power station does not have the power smoothing capability in short time scale. At present, in the construction process of new energy power station, a certain proportion of chemical energy storage system is required to be configured according to the requirements, and the wind and light fluctuations are suppressed through the charge and discharge characteristics of the chemical energy storage system, so as to realize the power smoothing of the grid connection point. However, the service life of the chemical energy storage system will be greatly reduced with frequent charge and discharge, thereby affecting the overall benefit of the power station. SUMMARY

[0004] In order to suppress the volatility of the active power of the wind-solar station grid connection point, the present application provides a wind-solar station active power control method and device.

[0005] In the first aspect, the present application provides a wind-solar station active power control method, the method comprising:

[0006] obtaining the grid dispatch instruction power and the maximum available wind-solar power;

[0007] when the grid dispatch instruction power is greater than the maximum available wind-solar power, taking the maximum available wind power as the first wind power instruction;

[0008] determining the first photovoltaic power instruction according to the maximum available photovoltaic power, the maximum available photovoltaic power being the sum of the first photovoltaic power instruction and the reserved power;

[0009] obtaining the first grid connection point power at the previous time when the first wind power instruction and the first photovoltaic power instruction are executed and the second grid connection point power at the current time;

[0010] if the difference between the first grid connection point power and the second grid connection point power is greater than a preset value, determining the second photovoltaic power instruction according to the difference and the reserved power, and the sum of the first photovoltaic power instruction and the second photovoltaic power instruction being the final photovoltaic power instruction;

[0011] controlling the wind power station according to the first wind power instruction and the final photovoltaic power instruction.

[0012] When the fluctuation between the grid-connected point powers of adjacent moments is large, due to the droop characteristics of the wind turbine, the grid-connected point power of the wind power station needs to be smoothed in time. Considering the rapidity of the power electronic device in the photovoltaic station in adjusting active power, the smoothing effect of the active power of the wind-solar station is realized by reserving part of the power in the photovoltaic station, the fluctuation of the active power of the grid-connected point of the wind-solar station is inhibited, the frequent adjustment of the rotating equipment of the wind turbine is avoided, the wear and tear of the shaft system of the wind turbine is reduced, the operation and maintenance cost of the wind-solar station is reduced, and the use frequency of the energy storage system is avoided or reduced.

[0013] With reference to the first aspect, in a first embodiment of the first aspect, the method further comprises:

[0014] When the grid dispatching instruction power is less than the maximum available power of the wind-solar station,

[0015] According to the grid dispatching instruction power and the proportion of the maximum available power of the wind power to the maximum available power of the wind-solar station, the second wind power instruction power is determined.

[0016] The actual power of the wind power after the second wind power instruction power is executed is obtained.

[0017] According to the grid dispatching instruction and the actual power of the wind power, the third photovoltaic instruction power is determined.

[0018] According to the second wind power instruction power and the third photovoltaic instruction power, the wind power station is controlled.

[0019] When the grid dispatching instruction power is less than the maximum available power of the wind-solar station, the fluctuation of the output of the wind power station is smoothed by the photovoltaic station, so that the fluctuation of the active power of the grid-connected point of the wind-solar station is improved.

[0020] With reference to the first aspect, in a second embodiment of the first aspect, determining the second photovoltaic instruction power according to the difference and the reserved power comprises:

[0021] If the reserved power is greater than half of the difference, half of the difference is taken as the second photovoltaic instruction power.

[0022] With reference to the second embodiment of the first aspect, in a third embodiment of the first aspect, determining the second photovoltaic instruction power according to the difference and the reserved power comprises:

[0023] If the reserved power is less than half of the difference, the reserved power is taken as the second photovoltaic instruction power.

[0024] With reference to the third embodiment of the first aspect, in a fourth embodiment of the first aspect, the method further comprises:

[0025] If the reserved power is less than half of the difference, the energy storage system is started, and the difference between half of the difference and the actual power corresponding to the reserved power is taken as the energy storage instruction power.

[0026] control the energy storage system according to the energy storage instruction power.

[0027] In a fifth embodiment of the first aspect, according to the grid scheduling instruction and the wind power actual output power, the third PV instruction power is determined, including:

[0028] If the difference between the grid scheduling instruction power and the wind power actual output power is less than the maximum PV output power, the difference between the grid scheduling instruction power and the wind power actual output power is taken as the third PV instruction power.

[0029] In a sixth embodiment of the first aspect, according to the grid scheduling instruction and the wind power actual output power, the third PV instruction power is determined, including:

[0030] If the difference between the grid scheduling instruction power and the wind power actual output power is greater than the maximum PV output power, the maximum PV output power is taken as the third PV instruction power.

[0031] In a seventh embodiment of the first aspect, the method further includes:

[0032] If the difference between the grid scheduling instruction power and the wind power actual output power is greater than the maximum PV output power, the energy storage system is started, and the difference between the grid scheduling instruction power and the actual output power of the grid-connected point after the second wind power instruction power and the third PV instruction power are executed is taken as the energy storage instruction power of the energy storage system.

[0033] control the energy storage system according to the energy storage instruction power.

[0034] In an eighth embodiment of the first aspect, the first grid-connected point power at the previous time and the second grid-connected point power at the current time after the first wind power instruction power and the first PV instruction power are executed are obtained, including:

[0035] After a preset time length of the first wind power instruction power and the first PV instruction power are executed, the first grid-connected point power at the previous time and the second grid-connected point power at the next time are obtained.

[0036] In a second aspect, the present application further provides a wind-solar-storage station active power control device, which includes:

[0037] The first obtaining module is configured to obtain the grid scheduling instruction power and the maximum wind-solar output power.

[0038] The first determining module is configured to, when the grid scheduling instruction power is greater than the maximum wind-solar output power, take the maximum wind power output power as the first wind power instruction power.

[0039] The second determining module is configured to determine the first photovoltaic instruction power according to the maximum available photovoltaic power, wherein the maximum available photovoltaic power is the sum of the first photovoltaic instruction power and the reserved power.

[0040] The second obtaining module is configured to obtain the first grid-connected point power at the previous time and the second grid-connected point power at the current time after the first wind power instruction power and the first photovoltaic instruction power are executed.

[0041] The third determining module is configured to determine the second photovoltaic instruction power according to the difference and the reserved power if the difference between the first grid-connected point power and the second grid-connected point power is greater than a preset value, wherein the sum of the first photovoltaic instruction power and the second photovoltaic instruction power is the final photovoltaic instruction power.

[0042] The first control module is configured to control the wind farm according to the first wind power instruction power and the final photovoltaic instruction power.

[0043] Considering the rapidity of the power electronic device in the photovoltaic station to adjust the active power, the smoothness of the active power of the wind-solar station is realized by reserving part of the power in the photovoltaic station, the fluctuation of the active power of the wind-solar station is inhibited, the frequent adjustment of the fan rotating equipment is avoided, the wear of the fan shaft is reduced, the operation and maintenance cost of the wind-solar station is reduced, and the use frequency of the energy storage system is avoided or reduced. BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0045] Figure 1 is a flow chart of a wind-solar station active power control method according to an exemplary embodiment;

[0046] Figure 2 is a flow chart of a wind-solar station active power control method in a limited power generation mode in an example;

[0047] Figure 3 is a structural schematic diagram of a wind-solar station active power control device according to an exemplary embodiment;

[0048] Figure 4 is a hardware structure schematic diagram of a computer device according to an exemplary embodiment. DETAILED DESCRIPTION

[0049] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0050] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0051] In order to suppress the fluctuation of active power at the grid-connection point of the wind-solar power station, the present application provides a wind-solar power station active power control method and device.

[0052] Figure 1 is a flow chart of a wind-solar power station active power control method according to an exemplary embodiment. As shown in Figure 1 , the method comprises the following steps S101 to S106.

[0053] Step S101: Obtain the grid dispatch instruction power and the maximum available wind-solar power.

[0054] In an optional embodiment, the maximum available wind-solar power is the sum of the maximum available wind power and the maximum available photovoltaic power.

[0055] Step S102: When the grid dispatch instruction power is greater than the maximum available wind-solar power, take the maximum available wind power as the first wind power instruction.

[0056] In an optional embodiment, when the grid dispatch instruction power is greater than the maximum available wind-solar power, the wind-solar power station is in a free power generation mode. In this mode, the maximum available wind power is not limited, i.e. the wind farm takes the maximum available wind power as the first wind power instruction.

[0057] Step S103: Determine the first photovoltaic instruction power according to the maximum available photovoltaic power, the maximum available photovoltaic power being the sum of the first photovoltaic instruction power and the reserved power.

[0058] In an optional embodiment, the first photovoltaic instruction power can be the maximum available photovoltaic power with a preset proportion, and the preset proportion can be adjusted according to actual conditions.

[0059] In an optional embodiment, the first photovoltaic instruction power is used to respond to the grid dispatch instruction power, and the reserved power is used to suppress the fluctuation of active power at the grid-connection point of the wind-solar power station.

[0060] Step S104: Obtain the first grid-connection point power at the previous time when the first wind power instruction and the first photovoltaic instruction power are executed and the second grid-connection point power at the current time.

[0061] In an optional embodiment, the grid-connected point power is the sum of the wind power and the photovoltaic power, and the grid-connected point power can be obtained by a grid-connected point active power acquisition device. The wind power can be obtained by a wind turbine control system, and the photovoltaic power can be obtained by a photovoltaic data acquisition device.

[0062] Step S105: If the difference between the first grid-connected point power and the second grid-connected point power is greater than a preset value, determining the second photovoltaic instruction power according to the difference and the reserved power, and the sum of the first photovoltaic instruction power and the second photovoltaic instruction power is the final photovoltaic instruction power.

[0063] In an optional embodiment, the size of the preset value can be set according to the requirements of the power grid or the wind-solar station.

[0064] Step S106: Controlling the wind-solar station according to the first wind instruction power and the final photovoltaic instruction power.

[0065] When the fluctuation between the grid-connected point powers at adjacent moments is large, due to the droop characteristics of the wind turbine, it is necessary to smooth the grid-connected point power of the wind-solar station in time. Considering the rapidity of the power electronic device in the photovoltaic station in adjusting the active power, in the embodiment of the present application, part of the power in the photovoltaic station is reserved to realize the smoothing effect of the active power of the wind-solar station, and the fluctuation of the active power of the grid-connected point of the wind-solar station is suppressed, thereby avoiding the frequent adjustment of the rotating equipment of the wind turbine, reducing the wear of the shaft system of the wind turbine, and reducing the operation and maintenance cost of the wind-solar station. In addition, by smoothing the active power of the wind-solar station through the photovoltaic station, the use of the energy storage system is avoided or reduced.

[0066] In an example, after the preset duration of the first wind instruction power and the first photovoltaic instruction power is executed, the first grid-connected point power at the previous moment and the second grid-connected point power at the current moment are obtained again. This is to avoid accidental mutations of the grid-connected point power, thereby affecting the judgment of the difference between the first grid-connected point power and the second grid-connected point power. After the first wind instruction power and the first photovoltaic instruction power are executed, the first grid-connected point power at the previous moment and the second grid-connected point power at the current moment are obtained again after waiting for a preset duration, which can more accurately judge the difference between the first grid-connected point power and the second grid-connected point power.

[0067] In an example, the specific content of determining the second photovoltaic instruction power in the above step S105 includes:

[0068] If the reserved power is greater than half of the difference, half of the difference is taken as the second photovoltaic instruction power, and the formula is as follows:

[0069]

[0070] P pP1 is the first grid point power, and P2 is the second grid point power.

[0071] If the reserved power is less than half of the difference, the reserved power is taken as the second photovoltaic instruction power.

[0072] In an example, when the reserved power in the photovoltaic power station is insufficient for grid point power smoothing, the energy storage system also needs to be called to suppress fluctuations, that is, if the reserved power is less than half of the difference, the energy storage system also needs to be started, and the difference between half of the difference and the actual output power corresponding to the reserved power is taken as the energy storage instruction power; the energy storage system is controlled according to the energy storage instruction power. Exemplarily, the energy storage system can be controlled by an energy storage local energy management system. The energy storage instruction power is obtained by the following formula:

[0073]

[0074] wherein, P s is the energy storage instruction power, and P pa is the actual output power corresponding to the reserved power.

[0075] In an example, when the grid dispatch instruction power is less than the maximum available power of wind and light, the wind power station is in a limited power generation mode, and the wind and light power station active power control method provided by the embodiment of the application also includes the following steps S201 to S204, as shown in Figure 2

[0076] Step S201: When the grid dispatch instruction power is less than the maximum available power of wind and light, the second wind power instruction power is determined according to the grid dispatch instruction power and the proportion of the maximum available power of wind to the maximum available power of wind and light.

[0077] In an optional embodiment, the specific calculation formula of the second wind power instruction power is as follows:

[0078]

[0079] wherein, P 风指令 is the second wind power instruction power, p 调度指令 is the grid dispatch instruction power, p 风最大可发 is the maximum available power of wind, and p 光最大可发 is the maximum available power of light.

[0080] Step S202: The actual output power of wind after the second wind power instruction power is executed is obtained.

[0081] Step S203: The third photovoltaic instruction power is determined according to the grid dispatch instruction and the actual output power of wind.

[0082] ​Step S204: controlling the wind power station according to the second wind power instruction power and the third photovoltaic power instruction power.

[0083] When the grid dispatching instruction power is less than the maximum wind-solar power generation capacity, the wind power station is in a limited power generation mode, in which the wind power station is set to generate power according to the proportion of the maximum wind power generation capacity to the maximum wind-solar power generation capacity, and the photovoltaic power station undertakes the power in the grid dispatching instruction power except the actual power generation of the wind power station. Compared with the wind power station or the photovoltaic power station undertaking the grid dispatching instruction power, the method provided in the embodiment of the present application meets the requirements of the wind-solar station abandoned wind rate and abandoned light rate on the one hand. On the other hand, if the wind power station is used to realize the smoothing of the active power at the grid connection point, frequent adjustment of the rotating equipment of the wind turbine will cause wear of the shaft system of the wind turbine, which is not feasible. The power electronic device in the photovoltaic power station can quickly adjust the power, so that the volatility of the active power at the grid connection point of the wind-solar station is improved.

[0084] In an example, in the step S203, if the difference between the grid dispatching instruction power and the actual wind power generation is less than the maximum photovoltaic power generation capacity, the difference between the grid dispatching instruction power and the actual wind power generation is taken as the third photovoltaic power instruction power.

[0085] In an example, in the step S203, if the difference between the grid dispatching instruction power and the actual wind power generation is greater than the maximum photovoltaic power generation capacity, the maximum photovoltaic power generation capacity is taken as the third photovoltaic power instruction power.

[0086] In an example, when the photovoltaic power station is insufficient to perform the grid connection point power smoothing, the energy storage system also needs to be called to suppress the fluctuation, that is, if the difference between the grid dispatching instruction power and the actual wind power generation is greater than the maximum photovoltaic power generation capacity, the energy storage system needs to be started, and the difference between the grid dispatching instruction power and the actual wind power generation after the second wind power instruction power and the third photovoltaic power instruction power is executed is taken as the energy storage instruction power of the energy storage system; then, the energy storage system is controlled according to the energy storage instruction power.

[0087] Figure 3 is a structural schematic diagram of a wind-solar station active power control device according to an example embodiment. The device comprises:

[0088] The first acquisition module 301 is configured to acquire the grid dispatching instruction power and the maximum wind-solar power generation capacity; for details, refer to the description of the step S101 in the above embodiment, which will not be repeated here.

[0089] The first determination module 302 is configured to, when the grid dispatching instruction power is greater than the maximum wind-solar power generation capacity, take the maximum wind power generation capacity as the first wind power instruction power; for details, refer to the description of the step S102 in the above embodiment, which will not be repeated here.

[0090] The second determining module 303 is configured to determine the first photovoltaic instruction power according to the maximum available photovoltaic power, wherein the maximum available photovoltaic power is the sum of the first photovoltaic instruction power and the reserved power. For details, refer to the description of step S103 in the above embodiment, which will not be repeated here.

[0091] The second obtaining module 304 is configured to obtain the first grid-connected point power at the previous moment and the second grid-connected point power at the current moment after the first wind power instruction power and the first photovoltaic instruction power are executed. For details, refer to the description of step S104 in the above embodiment, which will not be repeated here.

[0092] The third determining module 305 is configured to determine the second photovoltaic instruction power according to the difference value and the reserved power if the difference between the first grid-connected point power and the second grid-connected point power is greater than the preset value, and the sum of the first photovoltaic instruction power and the second photovoltaic instruction power is the final photovoltaic instruction power. For details, refer to the description of step S105 in the above embodiment, which will not be repeated here.

[0093] The first control module 306 is configured to control the wind farm according to the first wind power instruction power and the final photovoltaic instruction power. For details, refer to the description of step S106 in the above embodiment, which will not be repeated here.

[0094] In an example, the apparatus further includes:

[0095] The fourth determining module is configured to determine the second wind power instruction power according to the grid dispatching instruction power and the proportion of the maximum available wind power and the maximum available wind-solar power when the grid dispatching instruction power is less than the maximum available wind-solar power. For details, refer to the description in the above embodiment, which will not be repeated here.

[0096] The third obtaining module is configured to obtain the wind power actual generation power after the second wind power instruction power is executed. For details, refer to the description in the above embodiment, which will not be repeated here.

[0097] The fifth determining module is configured to determine the third photovoltaic instruction power according to the grid dispatching instruction and the wind power actual generation power. For details, refer to the description in the above embodiment, which will not be repeated here.

[0098] The second control module is configured to control the wind power station according to the second wind power instruction power and the third photovoltaic instruction power. For details, refer to the description in the above embodiment, which will not be repeated here.

[0099] In an example, in the third determining module 305, it includes:

[0100] The first determining submodule is configured to take one half of the difference value as the second photovoltaic instruction power if the reserved power is greater than one half of the difference value. For details, refer to the description in the above embodiment, which will not be repeated here.

[0101] In an example, in the third determining module 305, further comprising:

[0102] The second determining submodule is configured to, if the reserved power is less than half of the difference, take the reserved power as the second photovoltaic instruction power. For details, refer to the description in the above embodiments, which are not described here again.

[0103] In an example, in the apparatus, further comprising:

[0104] The sixth determining module is configured to, if the reserved power is less than half of the difference, start the energy storage system, and take the difference between half of the difference and the actual output power corresponding to the reserved power as the energy storage instruction power. For details, refer to the description in the above embodiments, which are not described here again.

[0105] The third control module is configured to control the energy storage system according to the energy storage instruction power. For details, refer to the description in the above embodiments, which are not described here again.

[0106] In an example, in the fifth determining module, comprising:

[0107] The third determining submodule is configured to, if the difference between the grid dispatching instruction power and the actual output power of the wind power is less than the maximum available output power of the photovoltaic, take the difference between the grid dispatching instruction power and the actual output power of the wind power as the third photovoltaic instruction power. For details, refer to the description in the above embodiments, which are not described here again.

[0108] In an example, in the fifth determining module, further comprising:

[0109] The fourth determining submodule is configured to, if the difference between the grid dispatching instruction power and the actual output power of the wind power is greater than the maximum available output power of the photovoltaic, take the maximum available output power of the photovoltaic as the third photovoltaic instruction power. For details, refer to the description in the above embodiments, which are not described here again.

[0110] In an example, the apparatus further comprises:

[0111] The seventh determining module is configured to, if the difference between the grid dispatching instruction power and the actual output power of the wind power is greater than the maximum available output power of the photovoltaic, start the energy storage system, and take the difference between the grid dispatching instruction power and the actual output power of the grid-connected point after executing the second wind power instruction power and the third photovoltaic instruction power as the energy storage instruction power of the energy storage system. For details, refer to the description in the above embodiments, which are not described here again.

[0112] The fourth control module is configured to control the energy storage system according to the energy storage instruction power. For details, refer to the description in the above embodiments, which are not described here again.

[0113] In an example, the apparatus is further configured to obtain the first grid-connected point power at a previous time and the second grid-connected point power at a next time after the preset time length of the first wind power instruction and the first photovoltaic power instruction is executed. Details are described in the above embodiments and will not be repeated here.

[0114] The specific limitations and benefits of the above apparatus can be found in the above limitations of the wind-solar power station active power control method, which will not be repeated here. The above modules can be implemented in whole or in part by software, hardware, and combinations thereof. The above modules can be embedded in or independent of the processor in the computer device in hardware form, or can be stored in the memory in the computer device in software form, so as to be called and executed by the processor to perform the operations corresponding to the above modules.

[0115] Figure 4 is a hardware structure schematic diagram of a computer device according to an example embodiment. As shown in Figure 4 , the device includes one or more processors 410 and a memory 420, and the memory 420 includes a persistent memory, a volatile memory, and a hard disk, Figure 4 The device can also include an input device 430 and an output device 440.

[0116] The processor 410, the memory 420, the input device 430, and the output device 440 can be connected by a bus or other means, Figure 4 for example, by a bus connection.

[0117] The processor 410 can be a central processing unit (CPU). The processor 410 can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. chips, or combinations of the above chips. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0118] The memory 420, as a non-transitory computer readable storage medium, includes persistent memory, volatile memory and a hard disk, and can be used to store non-transitory software programs, non-transitory computer executable programs and modules, such as program instructions / modules corresponding to the active power control method of the wind-solar storage station in the embodiments of the present application. The processor 410 executes various functions and data processing of the server by running the non-transitory software programs, instructions and modules stored in the memory 420, that is, implements any one of the wind-solar storage station active power control methods described above.

[0119] The memory 420 can include a program storage area and a data storage area, wherein the program storage area can store an operating system and application programs required by at least one function; and the data storage area can store data required for use, etc. In addition, the memory 420 can include a high-speed random access memory, and can also include a non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state memory device. In some embodiments, the memory 420 can optionally include a memory disposed remotely with respect to the processor 410, and these remote memories can be connected to the data processing device through a network. Examples of the above-mentioned network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0120] The input device 430 can receive input digital or character information, and generate signal input related to user settings and function control. The output device 440 can include a display device such as a display screen.

[0121] One or more modules are stored in the memory 420, and when executed by the one or more processors 410, perform the method as shown in Figure 1 .

[0122] The above-mentioned product can execute the method provided by the embodiments of the present application, and has the corresponding function modules and beneficial effects of the execution method. Technical details not described in detail in the embodiments can be referred to the related description in the embodiments as shown in Figure 1 .

[0123] The embodiments of the present application also provide a non-transitory computer storage medium, and the computer storage medium stores computer executable instructions. The computer executable instructions can execute the control method in any method embodiment described above. The storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM), a random access memory (RAM), a flash memory, a hard disk drive (HDD) or a solid-state drive (SSD), etc. The storage medium can also include a combination of the above-mentioned types of memories.

[0124] It has to be noted that, in the present document, the terms "first", "second", etc. merely serve the purpose of distinguishing between two entities or operations, without necessarily requiring or implying any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "containing" or any other transitional term, do not exclude other matters than the ones, listed from the document. In general, the scope of the expression "a method comprising a step of (the method step)" is similar to the scope of the expression "a method of (the method step)", only the former explicitly does not exclude additional steps.

[0125] The foregoing is merely illustrative of the principles of the application and various modifications can be made by those skilled in the art without departing from the spirit and scope of the application. The above embodiments are merely meant to be illustrative of the principles of the application and various modifications can be made by those skilled in the art without departing from the spirit and scope of the application. The application is not to be limited to the embodiments disclosed herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for controlling the active power of a wind and solar power station, characterized in that, The method includes: Obtain the power dispatch command from the power grid and the maximum available power output of wind and solar power; When the power dispatch command is greater than the maximum wind and solar power generation capacity, the maximum wind power generation capacity will be used as the first wind power command power. The first photovoltaic command power is determined based on the maximum photovoltaic power output, wherein the maximum photovoltaic power output is the sum of the first photovoltaic command power and the reserved power. Obtain the first grid connection point power at the previous moment after executing the first wind power command power and the first photovoltaic command power, and the second grid connection point power at the current moment; If the difference between the power at the first grid connection point and the power at the second grid connection point is greater than a preset value, the second photovoltaic command power is determined based on the difference and the reserved power, and the sum of the first photovoltaic command power and the second photovoltaic command power is the final photovoltaic command power. Control the wind farm based on the first wind power command power and the final photovoltaic power command power; The method further includes: When the power dispatch command is less than the maximum available wind and solar power generation capacity. The second wind power command power is determined based on the power of the grid dispatch command and the ratio of the maximum wind power generation capacity to the maximum wind and solar power generation capacity. Obtain the actual wind power generated after executing the second wind power command; The third photovoltaic command power is determined based on the grid dispatch command and the actual wind power generation. Control the wind farm based on the second wind power command power and the third photovoltaic power command power; Based on the grid dispatch instructions and the actual wind power generation, the third photovoltaic command power is determined, including: If the difference between the grid dispatch command power and the actual wind power generation is less than the maximum photovoltaic power generation, the difference between the grid dispatch command power and the actual wind power generation will be used as the third photovoltaic command power.

2. The method according to claim 1, characterized in that, Determining the second photovoltaic command power based on the difference and the reserved power includes: If the reserved power is greater than half of the difference, half of the difference shall be taken as the second photovoltaic command power.

3. The method according to claim 2, characterized in that, Determining the second photovoltaic command power based on the difference and the reserved power includes: If the reserved power is less than half of the difference, the reserved power will be used as the second photovoltaic command power.

4. The method according to claim 3, characterized in that, The method further includes: If the reserved power is less than half of the difference, the energy storage system is activated, and the difference between half of the difference and the actual generated power corresponding to the reserved power is taken as the energy storage command power. The energy storage system is controlled according to the energy storage command power.

5. The method according to claim 1, characterized in that, Based on the grid dispatch instructions and the actual wind power generation, the third photovoltaic command power is determined, including: If the difference between the grid dispatch command power and the actual wind power generation is greater than the maximum photovoltaic power generation, the maximum photovoltaic power generation will be used as the third photovoltaic command power.

6. The method according to claim 5, characterized in that, The method further includes: If the difference between the grid dispatch command power and the actual wind power generation is greater than the maximum photovoltaic power generation, the energy storage system is activated, and the difference between the grid dispatch command power and the actual power generation at the grid connection point after executing the second wind power command power and the third photovoltaic command power is taken as the energy storage command power of the energy storage system. The energy storage system is controlled according to the energy storage command power.

7. The method according to claim 1, characterized in that, Obtaining the first grid-connected power at the previous moment after executing the first wind power command and the first photovoltaic power command, and the second grid-connected power at the current moment, includes: After a preset time period for executing the first wind power command and the first photovoltaic power command, the first grid connection point power at the previous moment and the second grid connection point power at the next moment are obtained.

8. A power control device for wind and solar power stations, characterized in that, The device includes: The first acquisition module is used to acquire the power dispatch command of the power grid and the maximum generating power of wind and solar power. The first determining module is used to take the maximum wind power generation capacity as the first wind power command power when the grid dispatch command power is greater than the maximum wind and solar power generation capacity. The second determining module is used to determine the first photovoltaic command power based on the maximum photovoltaic power output, wherein the maximum photovoltaic power output is the sum of the first photovoltaic command power output and the reserved power output. The second acquisition module is used to acquire the first grid connection point power at the previous moment after executing the first wind power command power and the first photovoltaic command power and the second grid connection point power at the current moment. The third determining module is used to determine the second photovoltaic command power based on the difference and the reserved power if the difference between the first grid connection point power and the second grid connection point power is greater than a preset value. The sum of the first photovoltaic command power and the second photovoltaic command power is the final photovoltaic command power. The first control module is used to control the wind farm based on the first wind power command power and the final photovoltaic command power. Also includes: When the power dispatch command is less than the maximum available wind and solar power generation capacity. The second wind power command power is determined based on the power of the grid dispatch command and the ratio of the maximum wind power generation capacity to the maximum wind and solar power generation capacity. Obtain the actual wind power generated after executing the second wind power command; The third photovoltaic command power is determined based on the grid dispatch command and the actual wind power generation. Control the wind farm based on the second wind power command power and the third photovoltaic power command power; Based on the grid dispatch instructions and the actual wind power generation, the third photovoltaic command power is determined, including: If the difference between the grid dispatch command power and the actual wind power generation is less than the maximum photovoltaic power generation, the difference between the grid dispatch command power and the actual wind power generation will be used as the third photovoltaic command power.

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