A power control method, device and electronic equipment of a wind-solar-storage combined power station

Abstract

The application discloses a power control method and device of a wind-solar-storage combined power station and electronic equipment, wherein the method comprises the following steps: calculating a power error between an active power instruction and an active power actual output value of a grid-connected point at a current moment, and performing PID calculation based on the power error to obtain a power response instruction of the grid-connected point at a next moment; and distributing the power response instruction to a wind power station, a solar power station and a storage power station, so that the wind power station, the solar power station and the storage power station respectively respond to the distributed instruction part and output respective active power actual output values at the next moment. The technical scheme provided by the application reduces the deviation between a power grid dispatching instruction and an actual wind-solar-storage station actual output instruction.

Description

Technical Field

[0001] This invention relates to the field of grid-connected control, and specifically to a power control method, apparatus, and electronic equipment for a combined wind-solar-storage power station. Background Technology

[0002] In recent years, with the goal of "peak carbon emissions and carbon neutrality," the power grid industry has accelerated the adjustment and optimization of its industrial and energy structures, and vigorously developed new energy sources. Large-scale construction of new energy power plants is an inevitable trend; therefore, building grid-friendly new wind-solar-storage combined power plants to improve grid-friendly performance is also an inevitable trend.

[0003] However, wind and solar power output is characterized by significant fluctuations and intermittency. Large-scale grid connection is not conducive to grid absorption and seriously affects grid stability. Therefore, introducing energy storage systems can smooth out wind and solar power fluctuations, thereby achieving stable tracking.

[0004] For power control during grid connection, most domestic wind, solar, and energy storage power stations currently employ line loss compensation and lookup table methods for error compensation. Line loss compensation suffers from economic losses due to the lag in calculation cycles, leading to inaccurate tracking of dispatch commands. Lookup table methods calculate the active power loss corresponding to the current power output based on real-time data from the site, providing real-time compensation. However, both methods suffer from the problem of communication delays or data loss, which can cause discrepancies between grid dispatch commands and actual commands issued by the wind, solar, and energy storage power stations. Summary of the Invention

[0005] In view of this, embodiments of the present invention provide a power control method, device and electronic equipment for a combined wind, solar and energy storage power station, thereby reducing the deviation between grid dispatch commands and actual commands issued by the wind, solar and energy storage power station.

[0006] According to a first aspect, embodiments of the present invention provide a power control method for a combined wind, solar, and energy storage power station. The method includes: calculating the power error between the active power command and the actual active power generated at the current grid connection point, and performing PID calculation based on the power error to obtain the power response command for the grid connection point at the next time; and allocating the power response command to the wind power station, the photovoltaic power station, and the energy storage power station, so that the wind power station, the photovoltaic power station, and the energy storage power station respectively respond to the allocated command portion and output their respective actual active power generated values ​​at the next time.

[0007] Optionally, before performing PID calculation based on the power error, the method further includes: calculating the power up-adjustment margin and power down-adjustment margin of the wind-solar-storage combined power station based on the respective power up-adjustment margin and power down-adjustment margin of the wind power station, photovoltaic power station, and energy storage power station; determining whether the power up-adjustment margin or the power down-adjustment margin of the wind-solar-storage combined power station is zero; if neither is zero, determining whether the power error is greater than a preset power error dead zone; if it is greater than the preset power error dead zone, then performing the step of performing PID calculation based on the power error.

[0008] Optionally, allocating the power response command to the wind power station, photovoltaic power station, and energy storage power station includes: selecting one of three allocation modes—wind priority mode, solar priority mode, or proportional mode—to allocate the power response command; wherein, the wind priority mode indicates that the power response command is allocated to the wind power station, photovoltaic power station, and energy storage power station based on the minimum wind curtailment rate; the solar priority mode indicates that the power response command is allocated to the wind power station, photovoltaic power station, and energy storage power station based on the minimum solar curtailment rate; and the proportional mode indicates that the power response command is allocated to the wind power station, photovoltaic power station, and energy storage power station according to a proportion calculated based on the maximum power adjustment range of each of the wind power station and photovoltaic power station.

[0009] Optionally, the wind priority mode allocates the power response commands to the wind power station, photovoltaic power station, and energy storage power station in the following manner:

[0010] The wind power station allocates power response commands according to the following formula.

[0011]

[0012] The photovoltaic power station allocates power response commands according to the following formula.

[0013]

[0014] The energy storage power station distributes power response commands according to the following formula.

[0015]

[0016] In the formula, P w P p P e P represents the partial instructions allocated to wind power stations, photovoltaic power stations, and energy storage power stations, respectively. c This indicates the power response command, P wmax P wmin P represents the maximum and minimum active power that wind power can generate, respectively. pmax P pminP represents the maximum and minimum active power that a photovoltaic system can generate, respectively. emax P emin These represent the maximum and minimum active power that the energy storage can generate, respectively.

[0017] Optionally, the light priority mode allocates the power response commands to the wind power station, photovoltaic power station, and energy storage power station in the following manner:

[0018] The wind power station allocates power response commands according to the following formula.

[0019]

[0020] The photovoltaic power station allocates power response commands according to the following formula.

[0021]

[0022] The energy storage power station distributes power response commands according to the following formula.

[0023]

[0024] In the formula, P w P p P e P represents the partial instructions allocated to wind power stations, photovoltaic power stations, and energy storage power stations, respectively. c This indicates the power response command, P wmax P wmin P represents the maximum and minimum active power that wind power can generate, respectively. pmax P pmin P represents the maximum and minimum active power that a photovoltaic system can generate, respectively. emax P emin These represent the maximum and minimum active power that the energy storage can generate, respectively.

[0025] Optionally, the proportional mode distributes the power response commands to the wind power station, photovoltaic power station, and energy storage power station in the following manner:

[0026] The wind power regulation capacity is calculated based on the maximum and minimum active power generated by wind power, and the photovoltaic regulation capacity is calculated based on the maximum and minimum active power generated by photovoltaic power.

[0027] The wind power station allocates power response commands according to the following formula.

[0028]

[0029] The photovoltaic power station allocates power response commands according to the following formula.

[0030]

[0031] The energy storage power station distributes power response commands according to the following formula.

[0032]

[0033] In the formula, P w P p P e P represents the partial instructions allocated to wind power stations, photovoltaic power stations, and energy storage power stations, respectively. c This indicates the power response command, P wmax P wmin P represents the maximum and minimum active power that wind power can generate, respectively. pmax P pmin P represents the maximum and minimum active power that a photovoltaic system can generate, respectively. emax P emin P represents the maximum and minimum active power that energy storage can generate, respectively. pv P wind These respectively represent the photovoltaic regulation capability and the wind power regulation capability.

[0034] Optionally, the method further includes: calculating the instruction difference between the partial instructions allocated to each of the wind power station, photovoltaic power station, and energy storage power station at the current moment and the partial instructions allocated to each of them at the previous moment; determining whether the instruction difference of each of the wind power station, photovoltaic power station, and energy storage power station is within a preset dead zone; for instruction differences that do not exceed the preset dead zone, allocating the partial instructions allocated at the previous moment to the corresponding power station as the partial instructions for the current moment; for instruction differences that exceed the preset dead zone, determining whether the instruction difference exceeding the preset dead zone exceeds the preset adjustment step size of the corresponding power station; if the instruction difference exceeding the preset dead zone exceeds the preset adjustment step size of the corresponding power station, allocating the partial instructions for the current moment to the corresponding power station according to the corresponding preset adjustment step size.

[0035] According to a second aspect, embodiments of the present invention provide a power control device for a combined wind, solar, and energy storage power station. The device includes: a PID adjustment module, used to calculate the power error between the active power command and the actual active power generated at the current grid connection point, and to perform PID calculation based on the power error to obtain the power response command for the grid connection point at the next time; and a power response command allocation module, used to allocate the power response command to the wind power station, the photovoltaic power station, and the energy storage power station, so that the wind power station, the photovoltaic power station, and the energy storage power station respectively respond to the allocated command portion and output their respective actual active power generated values ​​at the next time.

[0036] According to a third aspect, embodiments of the present invention provide an electronic device, including: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the method described in the first aspect, or any optional embodiment of the first aspect.

[0037] According to a fourth aspect, embodiments of the present invention provide a computer-readable storage medium storing computer instructions for causing the computer to perform the method described in the first aspect, or any alternative embodiment of the first aspect.

[0038] The technical solution provided in this application has the following advantages:

[0039] The technical solution provided in this application uses PID calculation to determine the power error between the active power command and the actual active power generated at the current grid connection point, obtaining the power response command for the grid connection point at the next time step. Then, the power response command is distributed to the wind power station, photovoltaic power station, and energy storage power station, enabling each station to respond to its assigned command portion and output its respective actual active power generated value at the next time step. By calculating the power response commands for each station using the PID method, the wind power station, photovoltaic power station, and energy storage power station can quickly track the active power command at the grid connection point, avoiding the inaccuracies caused by communication failures and delays in line loss compensation methods and table lookup methods. Attached Figure Description

[0040] The features and advantages of the invention will be more clearly understood by referring to the accompanying drawings, which are schematic and should not be construed as limiting the invention in any way. In the drawings:

[0041] Figure 1 The diagram illustrates the steps of a power control method for a combined wind, solar, and energy storage power station according to one embodiment of the present invention.

[0042] Figure 2 A flowchart illustrating a power control method for a combined wind, solar, and energy storage power station according to one embodiment of the present invention is shown.

[0043] Figure 3 This diagram illustrates the effect of a combined wind, solar, and energy storage control mode in one embodiment of the present invention.

[0044] Figure 4 This diagram illustrates the effect of another wind-solar-storage combined control mode in one embodiment of the present invention.

[0045] Figure 5 This diagram illustrates the effect of yet another wind-solar-storage combined control mode in one embodiment of the present invention.

[0046] Figure 6 This diagram illustrates the structure of a power control device for a combined wind, solar, and energy storage power station according to one embodiment of the present invention.

[0047] Figure 7 A schematic diagram of an electronic device according to one embodiment of the present invention is shown. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] Please see Figure 1 and Figure 2 In one embodiment, a power control method for a combined wind-solar-storage power station specifically includes the following steps:

[0050] Step S101: Calculate the power error between the active power command and the actual active power generated at the grid connection point at the current moment, and perform PID calculation based on the power error to obtain the power response command of the grid connection point at the next moment.

[0051] Step S102: Distribute the power response command to the wind power station, photovoltaic power station and energy storage power station so that the wind power station, photovoltaic power station and energy storage power station respond to the distributed command part and output their respective active power values ​​at the next moment.

[0052] Specifically, it reads the active power command P that the wind-solar-storage power station needs to track at the grid connection point at the current moment. cmd The actual active power generated by the power plant at the grid connection point, P act Power error dead zone P dead Then, the active power command P is calculated. cmd and the actual value of active power P act The power error e = P cmd -P act .

[0053] Then, read the parameters of the PID controller, including the proportional coefficient K. p Integral parameter K i and differential parameter K d The controlled variable is calculated based on the deviation signal, using the following formula:

[0054]

[0055] In the formula, P(k) is the power response command generated at the current moment, that is, the power response command of the grid connection point at the next moment calculated by PID, which is used by subsequent modules. e(i) is the active power command P cmd and the actual value of active power P act The discrete value of the power error, e(k) is the active power command P calculated at the current moment. cmd and the actual value of active power P act The power error, e(k-1) is the active power command P calculated at the previous moment. cmd and the actual value of active power P act The power error is P(k-1), which is the power response command generated at the previous moment.

[0056] The power response command P(k) calculated according to the above formula is allocated to the wind power station, photovoltaic power station and energy storage power station, so that the wind power station, photovoltaic power station and energy storage power station respond to their respective allocated command parts, and output their respective active power actual values ​​at the next moment, so that the active power actual value of the grid connection point can quickly and accurately track the active power command of the grid connection point.

[0057] The power control method based on PID calculation and redistribution of total control command provided in this embodiment amplifies the power deviation signal proportionally using a proportional element. A large power deviation indicates a small controlled variable, requiring a larger control quantity to rapidly increase it, and vice versa. An integral element integrates the deviation over time, incorporating historical deviation accumulation into the control quantity. Even when the deviation approaches zero, the control output remains large, maintaining a zero-deviation state and making the control system zero-steady-state-error. The derivative element, with its predictive properties, improves the dynamic characteristics of the control system. Since the controlled object and its related components have inertia or lag, the derivative action accelerates the control speed. This method incorporates unknown disturbances such as communication delays or data transmission losses in the controlled variable, resulting in more accurate power response commands for each control cycle. Compared to line loss compensation and lookup table methods, this significantly improves the accuracy of power control in wind-solar-storage combined power plants.

[0058] Specifically, in one embodiment, before performing PID calculation based on power error, the power control method for a combined wind-solar-storage power station provided by this embodiment of the invention further includes the following steps:

[0059] Step 1: Calculate the power up-adjustment margin and power down-adjustment margin of the combined wind-solar-storage power station based on the power up-adjustment margin and power down-adjustment margin of each wind power station, photovoltaic power station, and energy storage power station.

[0060] Step 2: Determine whether the power up-adjustment margin or the power down-adjustment margin of the wind-solar-storage combined power station is zero.

[0061] Step 3: If none of them are zero, then determine whether the power error is greater than the preset power error dead zone.

[0062] Step 4: If the power error dead zone is greater than the preset limit, then perform the PID calculation based on the power error.

[0063] Specifically, in this embodiment, the preset power up-adjustment margin and power down-adjustment margin of each wind power station, photovoltaic power station, and energy storage power station are also obtained. Then, based on the power up-adjustment margin and power down-adjustment margin of each wind power station, photovoltaic power station, and energy storage power station, the power up-adjustment margin and power down-adjustment margin of the wind-solar-storage combined power station are calculated, as follows:

[0064] P up =P wind-up +P pv-up +P ess-up P down =P wind-down +P pv-down +P ess-down

[0065] In the formula, P up For the upward adjustment margin of wind-solar-storage combined power plants, P wind-up For the upward adjustment margin of wind power, P pv-up For the upward adjustment margin of photovoltaic power plants, P ess-up For the upscaling margin of energy storage power stations; P down For the downsizing margin of wind-solar-storage combined power plants, P wind-down For the downsizing margin of wind power, P pv-down For the downsizing margin of photovoltaic power plants, P ess-down This is to allow for a reduction margin for energy storage power stations.

[0066] If the power adjustment margin of the combined wind, solar, and energy storage power station is zero, it indicates that the combined wind, solar, and energy storage power station has no margin for power adjustment. Therefore, in order to ensure the stability of the operation of the wind, solar, or energy storage power station, it will no longer enter the PID automatic control stage and will continue to maintain the current output power.

[0067] If there is a margin for power adjustment up or down, the system continues to determine whether the power error calculated at the current moment is within the preset power error dead zone. If the power error calculated at the current moment is within the dead zone, in order to avoid power oscillation caused by repeated power control, the PID calculation step is not performed, and the power response command from the previous moment is still allocated. Only when the power error exceeds the preset power error dead zone is the PID calculation performed, and the updated power response command is allocated, thereby improving the stability of the control system.

[0068] Furthermore, in this embodiment, when the active power output of the combined wind-solar-storage power station reaches its limit, it enters the saturation stage and triggers the integral saturation flag, setting the integral saturation flag to 1. For each newly acquired actual power data at each sampling time, as long as the integral saturation flag is detected to be 1, K is set to... i =0, no integration occurs, and the integral component no longer increases, remaining at the upper or lower limit. Simultaneously, to prevent the deviation from accumulating and causing the controller output to continuously increase or decrease, anti-integral saturation processing is implemented. Once the integral saturation stage is reached, the power error e is automatically set to 0 until the stage is exited, at which point the power error returns to the deviation between the active power command value and the actual measured value at the grid connection point.

[0069] Specifically, in one embodiment, step S102 above includes the following steps:

[0070] Step 5: Select one of the three allocation modes—wind priority mode, solar priority mode, or proportional mode—to allocate power response commands. Wind priority mode allocates power response commands to wind power plants, solar power plants, and energy storage plants based on the minimum wind curtailment rate. Solar priority mode allocates power response commands to wind power plants, solar power plants, and energy storage plants based on the minimum solar curtailment rate. Proportional mode allocates power response commands to wind power plants, solar power plants, and energy storage plants according to a proportion calculated based on the maximum power adjustment range of each wind power plant and solar power plant.

[0071] Specifically, in this embodiment of the invention, one of three modes—wind-solar ratio allocation, wind-priority allocation, and solar-priority allocation—is selected to allocate power response commands. This achieves power output for photovoltaic power plants, wind power plants, and energy storage power plants from three perspectives: minimum wind curtailment rate, minimum solar curtailment rate, and power adjustment range. This allows grid-connected control to flexibly adjust allocation strategies based on external factors such as the actual installed capacity of the power plant and actual weather conditions, further improving the flexibility of power control.

[0072] Specifically, in this embodiment, the wind priority response power allocation strategy characterizing the minimum wind curtailment rate is as follows:

[0073] The formula for allocating power response commands to a wind power plant is as follows:

[0074]

[0075] The formula for allocating power response commands to photovoltaic power plants is as follows:

[0076]

[0077] The formula for allocating power response commands to energy storage power stations is as follows:

[0078]

[0079] In the formula, P w P p P e P represents the partial instructions allocated to wind power stations, photovoltaic power stations, and energy storage power stations, respectively. c This represents the power response command, i.e., P(k) in step S101. wmax P wmin P represents the maximum and minimum active power that wind power can generate, respectively. pmax P pmin P represents the maximum and minimum active power that a photovoltaic system can generate, respectively. emax P emin These represent the maximum and minimum active power that the energy storage can generate, respectively.

[0080] Specifically, this embodiment first reads the maximum active power P that the wind power can generate in the wind-solar-storage power station. wmax Minimum active power P that wind power can generate wmin And the commissioning and decommissioning status; the maximum active power P generated by the photovoltaic power station. pmax Minimum active power P generated by photovoltaics pmin And the commissioning and decommissioning status; the maximum active power P that the energy storage power station can generate. emax Minimum active power P that can be generated by energy storage emin This includes the current SOC (State of Charge, battery state of charge) and its activation / deactivation status. The maximum and minimum available active power outputs represent the maximum and minimum output capabilities of the power station, respectively. The activation / deactivation status indicates whether the power station is in or out of the integrated control mode, affecting the maximum and minimum available active power outputs. If the integrated control mode is exited, the maximum and minimum available active power outputs, as well as the upward and downward adjustment margins for wind or solar power, are all set to 0. The SOC of the energy storage power station affects its readings and is used to characterize its usability. If the SOC < the preset lower SOC limit, the downward adjustment margin for the energy storage power station is set to 0; if the SOC > the preset upper SOC limit, the upward adjustment margin for the energy storage power station is set to 0.

[0081] Based on the above readings, if the adjustment margin condition is met, the PID calculation and instruction allocation process begins. This embodiment prioritizes full power generation from the wind power plant, assuming the minimum wind curtailment rate. Therefore, when the total instruction (power response instruction P) is... c When the sum of the maximum active power generated by wind power, the minimum active power generated by photovoltaic power, and the minimum active power generated by energy storage is greater than or equal to the sum of the maximum active power generated by wind power, the minimum active power generated by photovoltaic power, and the minimum active power generated by energy storage, the wind power station shall be calculated according to the maximum active power generated P. wmaxFull power generation, with curtailment only applied to solar and energy storage systems, ensuring minimal wind curtailment. This only applies when the total command (power response command P) is executed. c When the power output of wind power is less than the sum of the minimum active power output of photovoltaic power and the minimum active power output of energy storage, the wind power station shall be calculated according to the minimum active power output P. wmin Power generation is performed to prevent the total output from exceeding the limit set by the overall command. When the overall command (power response command P) is activated... c When the wind power generation is between the two ranges mentioned above, in order to ensure the minimum wind curtailment rate, the wind power generation capacity should be as large as possible, so that the wind power station can respond according to the power response command P. c The difference between the minimum active power generated by photovoltaic power and the minimum active power generated by energy storage is used to generate electricity, so as to allocate the total command to wind power stations to the maximum extent.

[0082] In this embodiment, the minimum wind curtailment rate is used as a condition, and the power response command P is used as a basis. c The area where the photovoltaic power station is located assigns commands. When the power response command P... c When the power response command P is greater than or equal to the sum of the maximum active power generated by wind power, the maximum active power generated by photovoltaic power, and the minimum active power generated by energy storage, the photovoltaic power station is allocated a command according to the maximum active power generated by photovoltaic power. This ensures that the photovoltaic power station operates at full capacity while the wind power station can operate at full capacity, thereby increasing the output of the combined wind-solar-storage power station. c When the power output is less than the sum of the maximum active power output of wind power, the minimum active power output of photovoltaic power, and the minimum active power output of energy storage, the power allocation command for the photovoltaic power station is based on the minimum active power output of photovoltaic power. Therefore, when wind power is not subject to power curtailment, priority is given to curtailing photovoltaic power stations, ensuring that the total output does not exceed the power response command P. c If the power response command P c Between the two ranges mentioned above, the power response command P is applied. c The difference between the maximum active power generated by wind power and the minimum active power generated by energy storage is the allocation instruction for photovoltaic power stations. This ensures that, under the condition of full wind power generation, the output of photovoltaic power stations is maximized, thereby improving the output of combined wind, solar and energy storage power stations.

[0083] Simultaneously, based on the allocation instructions for the aforementioned wind power and photovoltaic power stations, instruction allocation is also made for energy storage power stations. If the power response instruction P... c If the power response command P is greater than the sum of the maximum active power generated by wind power, photovoltaic power, and energy storage, then the energy storage power station will be allocated instructions according to the maximum active power generated by energy storage to ensure the highest output of the combined wind-solar-storage power station. cIf the actual active power generated by the wind power plant is less than the sum of the minimum active power generated by the photovoltaic power plant and the minimum active power generated by the energy storage plant, then the energy storage power station will be allocated an instruction according to the minimum active power generated by the energy storage plant. The actual scalar value of the minimum active power generated by the energy storage plant is negative, representing the charging of the energy storage plant. This absorbs the excess electricity generated by the wind power plant and the photovoltaic power plant, ensuring that the actual active power generated by the combined wind-solar-storage power station does not exceed the power response instruction P. c Therefore, the active power command at the grid connection point shall not be exceeded. If the power response command P... c Between the two ranges mentioned above, the power response command P is calculated. c The difference between the allocated wind power command portion and photovoltaic command portion is used to allocate power commands to the energy storage power station, so that the energy storage power station can make up for the insufficient output of the wind power station and photovoltaic power station in a timely manner, and ensure that the actual active power generated at the grid connection point accurately tracks the active power command of the grid connection point.

[0084] Specifically, in this embodiment, the light priority response power allocation strategy characterizing the minimum light rejection rate is as follows:

[0085] Wind power stations allocate power response commands according to the following formula.

[0086]

[0087] Photovoltaic power plants allocate power response commands according to the following formula.

[0088]

[0089] Energy storage power stations distribute power response commands according to the following formula.

[0090]

[0091] In the formula, P w P p P e P represents the partial instructions allocated to wind power stations, photovoltaic power stations, and energy storage power stations, respectively. c Indicates the power response command, P wmax P wmin P represents the maximum and minimum active power that wind power can generate, respectively. pmax P pmin P represents the maximum and minimum active power that a photovoltaic system can generate, respectively. emax P emin These represent the maximum and minimum active power that the energy storage can generate, respectively.

[0092] Specifically, the principle of allocating the minimum curtailment rate in this embodiment is the same as the wind priority allocation strategy described above, except that photovoltaic power plants are given priority to full power generation and other power plants are given priority to power curtailment. For a detailed explanation, please refer to the relevant description of the wind priority allocation strategy described above, which will not be repeated here.

[0093] Specifically, in this embodiment, the proportional response power allocation strategy is as follows:

[0094] The wind power regulation capacity P is calculated based on the maximum and minimum active power generated by wind power. wind The photovoltaic regulation capacity P is calculated based on the maximum and minimum active power generated by photovoltaics. pv These represent the maximum power adjustment range for wind power stations and photovoltaic power stations, respectively. The calculation formulas are as follows:

[0095] P wind =P wmax -P wmin

[0096] P pv =P pmax -P pmin

[0097] Subsequently, the wind power station distributes power response commands according to the following formula.

[0098]

[0099] Photovoltaic power plants allocate power response commands according to the following formula.

[0100]

[0101] Energy storage power stations distribute power response commands according to the following formula.

[0102]

[0103] In the formula, P w P p P e P represents the partial instructions allocated to wind power stations, photovoltaic power stations, and energy storage power stations, respectively. c Indicates the power response command, P wmax P wmin P represents the maximum and minimum active power that wind power can generate, respectively. pmax P pmin P represents the maximum and minimum active power that a photovoltaic system can generate, respectively. emax P emin These represent the maximum and minimum active power that the energy storage can generate, respectively.

[0104] Specifically, regarding the command allocation for wind power stations, when the power response command P... c When the power response command P is greater than the sum of the maximum active power generated by wind power, the maximum active power generated by photovoltaic power, and the minimum active power generated by energy storage, both wind power stations and photovoltaic power stations will allocate power according to the maximum active power generated; when the power response command P... c When the power response command P is less than the sum of the minimum active power generated by wind power, photovoltaic power, and energy storage, both wind power and photovoltaic power stations will allocate power according to the minimum active power generated. c Between the two ranges mentioned above, the power response command P is adjusted according to the ratio of the respective regulation capabilities of wind power and photovoltaic power. c The power is allocated according to a mechanism where those with greater ability contribute more, thereby improving the stability of power control.

[0105] At the same time, when the power response command P c When the power output exceeds the sum of the maximum active power outputs of wind power, photovoltaic power, and energy storage, the energy storage power station will generate full power and allocate power according to the maximum active power output; when the power response command P... c When the power output is less than the sum of the minimum active power outputs of wind power, photovoltaic power, and energy storage, the energy storage power station allocates power according to the minimum active power output; when the power response command P... c Between the two ranges mentioned above, the energy storage power station, based on the command portions already allocated to the wind power station and photovoltaic power station, receives the power response command P. c The remaining instructions were allocated to compensate for insufficient output from wind and solar power plants.

[0106] Specifically, in one embodiment, the power control method for a combined wind-solar-storage power station provided by this invention further includes the following steps:

[0107] Step 6: Calculate the instruction difference between the partial instructions allocated to the wind power station, photovoltaic power station, and energy storage power station at the current moment and the partial instructions allocated to each at the previous moment.

[0108] Step 7: Determine whether the command difference for each of the wind power station, photovoltaic power station, and energy storage power station is within the preset dead zone.

[0109] Step 8: For instruction differences that do not exceed the preset dead zone, allocate the portion of the instructions allocated at the previous time to the corresponding power station as the portion of the instructions at the current time.

[0110] Step 9: For instruction differences exceeding the preset dead zone, determine whether the instruction difference exceeding the preset dead zone exceeds the preset adjustment step size of the corresponding power station.

[0111] Step 10: If the instruction difference exceeding the preset dead zone exceeds the preset adjustment step size of the corresponding power station, then allocate a portion of the instructions at the current moment to the corresponding power station according to the corresponding preset adjustment step size.

[0112] Specifically, this embodiment of the invention further filters the instructions allocated to the wind power station, photovoltaic power station, and energy storage power station in the aforementioned steps. Instructions with too small a change are considered invalid and removed, while those with too large a change have their rate limited, thereby reducing the number of actions and further improving the stability of the power control system. The specific operation is shown in the following formula:

[0113] e wind (k)=P w (k)-P w (k-1)

[0114] e pv (k)=P p (k)-P p (k-1)

[0115] e ess (k)=P e (k)-P e (k-1)

[0116] The formula calculates the difference between the commands of wind power stations, photovoltaic power stations, and energy storage power stations compared to the previous command, and determines whether the command difference is within a preset dead zone. If it is within the dead zone, the allocation value of the previous cycle remains unchanged. If it exceeds the preset dead zone but does not exceed the preset adjustment step size of each power station, the power output is based on the latest allocated command. If the command difference of wind power stations, photovoltaic power stations, and energy storage power stations exceeds the corresponding preset adjustment step size, the adjustment is made according to the set step size to avoid excessive adjustment of any power station, which could cause power oscillation.

[0117] After processing through the above steps, the final value of the active power command will be sent to the respective energy management systems of the wind power station, photovoltaic power station, and energy storage power station.

[0118] Specifically, in one embodiment, the power control method for a wind-solar-storage integrated power station provided by this invention adjusts the parameters of the controller according to the system response characteristics of the wind farm, photovoltaic power station, and energy storage power station within the integrated power station to cope with different adjustment modes, and can achieve good control results.

[0119] First, the "black box" model is identified based on the operational data of the wind farm, photovoltaic power station, and energy storage power station within the on-site wind-solar-storage power station. Using the least squares method, the respective mathematical models are identified, and the system consisting of the controller and the controlled object is described as a transfer function of the response.

[0120] Then, a simulation model is established to tune the system for scenarios where the energy storage power station does not participate in regulation. Since the response time of the energy storage power station differs significantly from that of the wind farm and photovoltaic power station, different PID parameters are used. During regulation, the proportional, integral, and derivative coefficients in the PID regulation are determined based on the attenuation curve method and the transfer functions of the wind farm and photovoltaic power station.

[0121] Finally, a simulation model was established to tune the scenario in which the energy storage power station participates in regulation. During regulation, the proportional, integral, and derivative coefficients in the PID regulation were determined based on the attenuation curve method and the transfer functions of the wind farm, photovoltaic power station, and energy storage power station.

[0122] This embodiment takes into account that the wind and solar energy storage have different dynamic characteristics during regulation, and the regulation performance varies for different scenarios. Therefore, through the above parameter tuning steps, different PID parameters are set for different scenarios to meet the requirements of different scenarios, thereby further improving the stability of the power control system.

[0123] Specifically, in one application embodiment, the beneficial effects of the proposed solution are described through experimental simulation, such as... Figure 3 The diagram shown illustrates the effect of the combined wind, solar, and energy storage control mode in the simulation experiment. The solid line represents the active power command at the grid connection point, and the dashed line represents the actual active power generated at the grid connection point. The active power command jumps from 155MW to 165MW and then back down to 125MW. The diagram shows that the actual power generated by the combined wind, solar, and energy storage power station can keep up well with the command value, and the currently tuned PID proportional, integral, and derivative parameters can meet the control requirements.

[0124] Figure 4 This is a diagram showing the overall power output of the station under the combined wind, solar, and energy storage control mode during a step test. The solid line in the diagram represents the active power command at the grid connection point, and the dashed line represents the actual active power output at the grid connection point. As shown in the diagram, there are three upper step jumps from 30MW to 80MW, and three lower step jumps from 80MW to 20MW at 500s. The average active power deviation does not exceed 2%, which greatly reduces the fluctuation rate of grid connection, and the control effect meets expectations.

[0125] Figure 5 This diagram illustrates the overall power output of a wind-solar-storage power station under a combined wind-solar control mode, where only wind and solar power are involved in regulation during the energy storage phase-out phase. The solid line represents the active power command at the grid connection point, and the dashed line represents the actual active power generated at the grid connection point. As shown, the station tracks the dispatch command at 240MW for the first 750 seconds, and then the dispatch command is increased to 250MW after 750 seconds. This significantly reduces grid connection volatility, with the average active power deviation not exceeding 2%, and the control effect meets expectations.

[0126] Through the above steps, the technical solution provided in this application performs PID calculation on the power error between the active power command and the actual active power generated at the current grid connection point to obtain the power response command for the next grid connection point. Then, the power response command is allocated to the wind power station, photovoltaic power station, and energy storage power station, so that each station responds to its assigned command portion and outputs its respective actual active power generated value at the next time step. By calculating the power response commands for each station using the PID method, the wind power station, photovoltaic power station, and energy storage power station can quickly track the active power command at the grid connection point, avoiding the inaccuracies caused by communication failures and delays in line loss compensation methods and table lookup methods.

[0127] like Figure 6 As shown, this embodiment also provides a power control device for a combined wind-solar-storage power station, the device comprising:

[0128] The PID control module 101 is used to calculate the power error between the active power command and the actual active power generated at the grid connection point at the current moment, and to perform PID calculation based on the power error to obtain the power response command of the grid connection point at the next moment. For details, please refer to the relevant description of step S101 in the above method embodiment, which will not be repeated here.

[0129] The power response command allocation module 102 is used to allocate power response commands to the wind power station, photovoltaic power station, and energy storage power station, so that the wind power station, photovoltaic power station, and energy storage power station respectively respond to the allocated command portion and output their respective actual active power values ​​at the next moment. For details, please refer to the relevant description of step S102 in the above method embodiment, which will not be repeated here.

[0130] The power control device for the wind-solar-storage combined power station provided in this embodiment of the invention is used to execute the power control method for the wind-solar-storage combined power station provided in the above embodiment. Its implementation method and principle are the same. For details, please refer to the relevant description of the above method embodiment, which will not be repeated here.

[0131] Through the collaborative efforts of the aforementioned components, the technical solution provided in this application performs PID calculations on the power error between the active power command and the actual active power output at the current grid connection point, obtaining the power response command for the grid connection point at the next moment. Then, the power response command is allocated to the wind power station, photovoltaic power station, and energy storage power station, enabling each station to respond to its assigned command and output its respective actual active power output value at the next moment. By calculating the power response commands for each station using the PID method, the wind power station, photovoltaic power station, and energy storage power station can quickly track the active power command at the grid connection point, avoiding the inaccuracies caused by communication failures and delays in line loss compensation and table lookup methods.

[0132] Figure 7 An electronic device according to an embodiment of the present invention is shown. The device includes a processor 901 and a memory 902, which can be connected via a bus or other means. Figure 7 Taking the example of a connection between China and Israel via a bus.

[0133] Processor 901 can be a Central Processing Unit (CPU). Processor 901 can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or combinations of the above types of chips.

[0134] The memory 902, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as the program instructions / modules corresponding to the methods in the above method embodiments. The processor 901 executes various functional applications and data processing of the processor by running the non-transitory software programs, instructions, and modules stored in the memory 902, thereby implementing the methods in the above method embodiments.

[0135] The memory 902 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created by the processor 901, etc. Furthermore, the memory 902 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 902 may optionally include memory remotely located relative to the processor 901, and these remote memories may be connected to the processor 901 via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0136] One or more modules are stored in memory 902 and, when executed by processor 901, perform the methods described in the above method embodiments.

[0137] The specific details of the aforementioned electronic device can be understood by referring to the relevant descriptions and effects in the above method embodiments, and will not be repeated here.

[0138] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The implemented program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk drive (HDD), or solid-state drive (SSD), etc.; the storage medium can also include combinations of the above types of memory.

[0139] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A power control method for a combined wind-solar-storage power station, characterized in that, The method includes: Calculate the power error between the active power command and the actual active power generated at the current grid connection point, and perform PID calculation based on the power error to obtain the power response command of the grid connection point at the next time. The power response command is assigned to the wind power station, photovoltaic power station and energy storage power station, so that the wind power station, photovoltaic power station and energy storage power station respond to the assigned command part and output their respective active power values ​​at the next moment. The process of distributing the power response command to the wind power station, photovoltaic power station, and energy storage power station includes: Select one of three allocation modes—wind priority mode, solar priority mode, or proportional mode—to allocate the power response command. The wind priority mode represents allocating the power response command to wind power plants, photovoltaic power plants, and energy storage power plants based on the minimum wind curtailment rate; the solar priority mode represents allocating the power response command to wind power plants, photovoltaic power plants, and energy storage power plants based on the minimum solar curtailment rate; and the proportional mode represents allocating the power response command to wind power plants, photovoltaic power plants, and energy storage power plants according to a proportion calculated based on the maximum power adjustment range of each wind power plant and photovoltaic power plant. The wind priority mode allocates the power response commands to wind power plants, photovoltaic power plants, and energy storage power plants in the following manner: The wind power station allocates power response commands according to the following formula. The photovoltaic power station allocates power response commands according to the following formula. The energy storage power station distributes power response commands according to the following formula. The light priority mode allocates the power response commands to the wind power station, photovoltaic power station, and energy storage power station in the following manner: The wind power station allocates power response commands according to the following formula. The photovoltaic power station allocates power response commands according to the following formula. The energy storage power station distributes power response commands according to the following formula. The proportional mode distributes the power response commands to the wind power station, photovoltaic power station, and energy storage power station in the following manner: The wind power regulation capacity is calculated based on the maximum and minimum active power generated by wind power, and the photovoltaic regulation capacity is calculated based on the maximum and minimum active power generated by photovoltaic power. The wind power station allocates power response commands according to the following formula. The photovoltaic power station allocates power response commands according to the following formula. The energy storage power station distributes power response commands according to the following formula. In the formula, P w , P p , P e These represent the respective instructions allocated to wind power stations, photovoltaic power stations, and energy storage power stations. P c This indicates the power response command. P wmax , P wmin These represent the maximum and minimum active power that wind power can generate, respectively. P pmax , P pmin These represent the maximum and minimum active power that a photovoltaic system can generate, respectively. P emax , P emin These represent the maximum and minimum active power that energy storage can generate, respectively. P pv , P wind These respectively represent the photovoltaic regulation capability and the wind power regulation capability.

2. The method according to claim 1, characterized in that, Prior to performing PID calculation based on the power error, the method further includes: The power up-adjustment margin and power down-adjustment margin of the combined wind-solar-storage power station are calculated based on the power up-adjustment margin and power down-adjustment margin of each wind power station, photovoltaic power station, and energy storage power station. Determine whether the power up-adjustment margin or the power down-adjustment margin of the wind-solar-storage combined power station is zero. If none of them are zero, then determine whether the power error is greater than the preset power error dead zone; If the power error dead zone is greater than the preset limit, then the step of performing PID calculation based on the power error is executed.

3. The method according to claim 1, characterized in that, The method further includes: Calculate the instruction difference between the partial instructions allocated to the wind power station, photovoltaic power station and energy storage power station at the current time and the partial instructions allocated to each at the previous time. Determine whether the command difference for each of the wind power station, photovoltaic power station, and energy storage power station is within the preset dead zone; For instruction differences that do not exceed the preset dead zone, the corresponding power station is allocated a portion of the instructions allocated at the previous time as a portion of the instructions at the current time. For instruction differences exceeding the preset dead zone, it is determined whether the instruction difference exceeding the preset dead zone exceeds the preset adjustment step size of the corresponding power station; If the instruction difference exceeding the preset dead zone exceeds the preset adjustment step size of the corresponding power station, then the corresponding power station will be allocated a portion of the instructions at the current moment according to the corresponding preset adjustment step size.

4. A power control device for a combined wind-solar-storage power station, characterized in that, The device includes: The PID control module is used to calculate the power error between the active power command and the actual active power generated at the current grid connection point, and to perform PID calculation based on the power error to obtain the power response command of the grid connection point at the next time. The power response command allocation module is used to allocate the power response command to the wind power station, the photovoltaic power station and the energy storage power station, so that the wind power station, the photovoltaic power station and the energy storage power station respond to the allocated command part and output their respective active power values ​​at the next moment. The process of distributing the power response command to the wind power station, photovoltaic power station, and energy storage power station includes: Select one of three allocation modes—wind priority mode, solar priority mode, or proportional mode—to allocate the power response command. The wind priority mode represents allocating the power response command to wind power plants, photovoltaic power plants, and energy storage power plants based on the minimum wind curtailment rate; the solar priority mode represents allocating the power response command to wind power plants, photovoltaic power plants, and energy storage power plants based on the minimum solar curtailment rate; and the proportional mode represents allocating the power response command to wind power plants, photovoltaic power plants, and energy storage power plants according to a proportion calculated based on the maximum power adjustment range of each wind power plant and photovoltaic power plant. The wind priority mode allocates the power response commands to wind power plants, photovoltaic power plants, and energy storage power plants in the following manner: The wind power station allocates power response commands according to the following formula. The photovoltaic power station allocates power response commands according to the following formula. The energy storage power station distributes power response commands according to the following formula. The light priority mode allocates the power response commands to the wind power station, photovoltaic power station, and energy storage power station in the following manner: The wind power station allocates power response commands according to the following formula. The photovoltaic power station allocates power response commands according to the following formula. The energy storage power station distributes power response commands according to the following formula. The proportional mode distributes the power response commands to the wind power station, photovoltaic power station, and energy storage power station in the following manner: The wind power regulation capacity is calculated based on the maximum and minimum active power generated by wind power, and the photovoltaic regulation capacity is calculated based on the maximum and minimum active power generated by photovoltaic power. The wind power station allocates power response commands according to the following formula. The photovoltaic power station allocates power response commands according to the following formula. The energy storage power station distributes power response commands according to the following formula. In the formula, P w , P p , P e These represent the respective instructions allocated to wind power stations, photovoltaic power stations, and energy storage power stations. P c This indicates the power response command. P wmax , P wmin These represent the maximum and minimum active power that wind power can generate, respectively. P pmax , P pmin These represent the maximum and minimum active power that a photovoltaic system can generate, respectively. P emax , P emin These represent the maximum and minimum active power that energy storage can generate, respectively. P pv , P wind These respectively represent the photovoltaic regulation capability and the wind power regulation capability.

5. An electronic device, characterized in that, include: A memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, the processor executing the computer instructions to perform the method as described in any one of claims 1-3.

6. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to perform the method as described in any one of claims 1-3.

Images