A wind-solar-storage coordinated primary frequency modulation system and method

Abstract

The present invention discloses a wind-solar-storage coordinated primary frequency regulation system and method, the system comprising: a grid-connected point frequency sensing device, a primary frequency regulation device, an energy storage coordination controller, an automatic power generation control device, a wind turbine energy management device, a photovoltaic data acquisition device, an energy storage on-site energy management device and an energy storage inverter. The system realizes the control of battery charging and discharging through the energy storage inverter through the coordination between the energy storage coordination controller and the energy storage on-site energy management device, breaking through the bottleneck of wind-solar-storage coordinated primary frequency regulation, and shortening the primary frequency regulation response time from seconds to milliseconds, that is, realizing the rapid and active support of new energy + energy storage for the grid frequency.

Description

Technical Field

[0001] The present invention relates to the technical field of wind-solar-storage coordinated primary frequency regulation, and in particular to a wind-solar-storage coordinated primary frequency regulation system and method. Background Art

[0002] At present, new energy stations mainly exist in the form of independent wind farms and photovoltaic farms. With the large-scale access of new energy, their volatility, randomness and intermittent characteristics have brought huge challenges to the safety and stability of the power grid. Therefore, the power grid’s demand for active support capabilities for new energy is becoming more and more urgent.

[0003] In order to reduce the impact of large-scale access of new energy on the safety and stability of the power grid and enhance the active support capacity of new energy for the power grid, the existing independent wind farms and photovoltaic farms have added a single frequency regulation device and reserved a certain amount of hot standby to achieve primary frequency regulation. For newly built new energy stations, a certain proportion of energy storage systems need to be configured as required. At present, the active support of the power grid by large-scale energy storage + new energy synergy is still achieved through the configuration of wind turbines and photovoltaics with a primary frequency regulation function.

[0004] Regardless of whether new energy stations have been built or newly built, their primary frequency regulation function is mainly achieved through wind turbines or photovoltaics, which has three disadvantages: First, wind turbines and photovoltaics need to reserve spare capacity at all times, which affects the power generation efficiency. Second, the adjustment time of wind turbines and photovoltaics participating in primary frequency regulation is in seconds, and the frequency support capacity of the power grid is insufficient. Third, although the newly built new energy stations are equipped with energy storage systems, there is a lack of active support strategies for the grid frequency through large-scale energy storage + new energy coordinated primary frequency regulation, and the rapid responsiveness of energy storage has not been fully utilized. The support capacity of the newly built new energy + energy storage for the power grid is still insufficient. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect of insufficient frequency support capacity of the power grid in the prior art that realizes the primary frequency regulation function through wind turbines or photovoltaics, thereby providing a wind, solar and storage coordinated primary frequency regulation system and method.

[0006] The embodiment of the present invention provides a wind-solar-storage coordinated primary frequency regulation system, including: a grid-connected point frequency sensing device, a primary frequency regulation device, an energy storage coordination controller, an automatic power generation control device, a wind turbine energy management device, a photovoltaic data acquisition device, an energy storage on-site energy management device and an energy storage inverter;

[0007] The grid connection point frequency sensing device is used to collect the grid connection point AC voltage cycle, convert the grid connection point AC voltage cycle into a frequency signal, and transmit the frequency signal to the primary frequency modulation device;

[0008] The primary frequency modulation device is connected to the wind turbine energy management device, the photovoltaic data acquisition device and the energy storage coordination controller, and is used to generate a primary frequency modulation active power instruction based on the frequency signal, and send the primary frequency modulation active power instruction to the wind turbine energy management device, the photovoltaic data acquisition device and the energy storage coordination controller;

[0009] The energy storage coordination controller is used to perform a first control on the energy storage inverter based on the primary frequency modulation active power instruction;

[0010] The automatic power generation control device is connected to the dispatching center, the wind turbine energy management device, the photovoltaic data acquisition device and the energy storage on-site energy management device, and is used to obtain dispatching instructions, decompose the dispatching instructions into wind, solar and energy storage instructions, and send the wind, solar and energy storage instructions to the wind turbine energy management device, the photovoltaic data acquisition device and the energy storage on-site energy management device;

[0011] The energy storage on-site energy management device is used to perform a second control on the energy storage inverter based on the wind-solar-storage instruction;

[0012] The energy storage inverter is connected to a battery and is used to control the battery to perform charging and discharging operations.

[0013] The present invention provides a wind-solar-storage coordinated primary frequency regulation system, which realizes the control of battery charging and discharging through the energy storage inverter through the coordination between the energy storage coordination controller and the energy storage on-site energy management device, breaking through the bottleneck of wind-solar-storage coordinated primary frequency regulation, and shortening the primary frequency regulation response time from seconds to milliseconds, thus realizing the rapid and active support of new energy + energy storage for the grid frequency.

[0014] Optionally, the primary frequency modulation device is also used to calculate the frequency difference between the frequency signal and the preset frequency. When the frequency difference is greater than the set value, a locking instruction is sent to the automatic power generation control device, and the frequency difference is converted into the primary frequency modulation active power instruction, and the active power instruction is compared with the scheduling instruction sent by the automatic power generation control device to generate a synthetic instruction, and the synthetic instruction is sent to the wind turbine energy management device, the photovoltaic data acquisition device and the energy storage coordination controller.

[0015] Optionally, the automatic power generation control device is further used to send the dispatching instruction to the primary frequency regulation device based on the locking instruction.

[0016] Optionally, the energy storage coordination controller is further used to issue a locking instruction to the energy storage inverter based on the primary frequency modulation active power instruction, and send a release locking instruction to the energy storage inverter after a preset delay time.

[0017] Optionally, the energy storage inverter is also used to lock the execution of instructions sent by the energy storage on-site energy management device based on the locking instruction, and to obtain and execute the wind-solar storage instructions for the next moment sent by the energy storage on-site energy management device based on the unlocking instruction.

[0018] In the second aspect of the present application, a wind-solar-storage coordinated primary frequency modulation method is also proposed, comprising:

[0019] The grid connection point frequency sensing device collects the grid connection point AC voltage cycle, converts the grid connection point AC voltage cycle into a frequency signal, and transmits the frequency signal to the primary frequency modulation device;

[0020] The primary frequency modulation device generates a primary frequency modulation active power instruction based on the frequency signal, and sends the primary frequency modulation active power instruction to the wind turbine energy management device, the photovoltaic data acquisition device and the energy storage coordination controller;

[0021] The energy storage coordination controller performs a first control on the energy storage inverter based on the primary frequency modulation active power instruction;

[0022] The automatic power generation control device obtains the dispatching instruction, decomposes the dispatching instruction into wind, solar and energy storage instructions, and sends the wind, solar and energy storage instructions to the wind turbine energy management device, the photovoltaic data acquisition device and the energy storage on-site energy management device;

[0023] The energy storage on-site energy management device performs a second control on the energy storage inverter based on the wind-solar storage instruction;

[0024] The energy storage inverter controls the battery to perform charging and discharging operations.

[0025] Optionally, the primary frequency modulation device generates a primary frequency modulation active power instruction based on the frequency signal, and sends the primary frequency modulation active power instruction to the wind turbine energy management device, the photovoltaic data acquisition device and the energy storage coordination controller, including:

[0026] The frequency difference between the frequency signal and the preset frequency is calculated. When the frequency difference is greater than the set value, a locking instruction is sent to the automatic power generation control device, and the frequency difference is converted into the primary frequency modulation active power instruction. The active power instruction is compared with the dispatching instruction sent by the automatic power generation control device to generate a synthetic instruction, and the synthetic instruction is sent to the wind turbine energy management device, the photovoltaic data acquisition device and the energy storage coordination controller.

[0027] Optionally, it also includes:

[0028] The automatic power generation control device sends the dispatch instruction to the primary frequency regulation device based on the locking instruction.

[0029] Optionally, the energy storage coordination controller performs a first control on the energy storage inverter based on the primary frequency modulation active power instruction, including:

[0030] The energy storage coordination controller sends a locking instruction to the energy storage inverter based on the primary frequency modulation active power instruction, and sends a release locking instruction to the energy storage inverter after a preset delay time.

[0031] Optionally, it also includes:

[0032] The energy storage inverter locks and executes the instruction sent by the energy storage on-site energy management device based on the locking instruction, and obtains and executes the wind-solar-storage instruction of the next moment sent by the energy storage on-site energy management device based on the unlocking instruction. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 This is a principle block diagram of a wind-solar-storage coordinated primary frequency modulation system in Embodiment 1 of the present invention;

[0035] Figure 2 This is a graph showing the active power-frequency droop characteristic of the new energy station in Example 1 of the present invention;

[0036] Figure 3 This is a flow chart of wind-solar-storage coordinated primary frequency modulation in Example 1 of the present invention;

[0037] Figure 4 This is a flow chart of a method for primary frequency modulation coordinated by wind, solar and energy storage in Example 2 of the present invention. DETAILED DESCRIPTION

[0038] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0040] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0041] Example 1

[0042] This embodiment provides a primary frequency modulation system coordinated with wind, solar and energy storage, such as Figure 1 As shown, it includes: a grid-connected point frequency sensing device 1, a primary frequency modulation device 2, an energy storage coordination controller 3, an automatic power generation control device 4, a wind turbine energy management device 5, a photovoltaic data acquisition device 6, an energy storage on-site energy management device 7 and an energy storage inverter 8;

[0043] The grid connection point frequency sensing device 1 is used to collect the grid connection point AC voltage cycle, convert the grid connection point AC voltage cycle into a frequency signal, and transmit the frequency signal to the primary frequency modulation device 2.

[0044] Specifically, the grid connection point frequency sensing device 1 converts the collected grid connection point AC voltage cycle into a frequency signal in real time and outputs it to the primary frequency modulation device 2, wherein the calculation formula of the frequency signal is:

[0045] f=1 / t

[0046] In the above formula, f represents the frequency signal, and t represents the AC voltage period at the grid connection point.

[0047] The above-mentioned primary frequency modulation device 2 is connected to the above-mentioned wind turbine energy management device 5, the above-mentioned photovoltaic data acquisition device 6 and the above-mentioned energy storage coordination controller 3, and is used to generate a primary frequency modulation active power instruction based on the above-mentioned frequency signal, and send the above-mentioned primary frequency modulation active power instruction to the above-mentioned wind turbine energy management device 5, the above-mentioned photovoltaic data acquisition device 6 and the above-mentioned energy storage coordination controller 3.

[0048] Specifically, the primary frequency modulation device 2 is also used to calculate the frequency difference between the frequency signal and the preset frequency. When the frequency difference is greater than the set value, a locking instruction is sent to the automatic power generation control device 4, and the frequency difference is converted into the primary frequency modulation active power instruction. The active power instruction is compared with the dispatching instruction sent by the automatic power generation control device 4 to generate a synthetic instruction, and the synthetic instruction is sent to the wind turbine energy management device 5, the photovoltaic data acquisition device 6 and the energy storage coordination controller 3.

[0049] Furthermore, the primary frequency modulation device 2 integrates the primary frequency modulation algorithm of wind, solar and storage coordination, and takes the absolute value of the frequency signal minus the preset frequency 50Hz (Hertz) as the frequency difference. When the frequency difference is greater than the set value, the primary frequency modulation sends a locking command to the automatic power generation control device 4. When the dispatching command sent by the automatic power generation control device 4 and the primary frequency modulation active power command are obtained at the same time, the dispatching command received from the automatic power generation control device 4 is synthesized with the frequency difference converted into the primary frequency modulation active power command according to its own algorithm, that is, the dispatching command and the primary frequency modulation active power command The instructions are superimposed in the same direction to generate a synthetic instruction, and are issued in the order of energy storage (i.e., issued by the energy storage coordination controller 3 to the energy storage inverter 8), photovoltaic data acquisition device 6, and wind turbine energy management device 5; in the opposite direction, the scheduling instruction is locked, and the primary frequency modulation active power instruction is directly issued in the order of energy storage, photovoltaic data acquisition device 6, and wind turbine energy management device 5; when the automatic power generation control device 4 sends the scheduling instruction and the primary frequency modulation active power instruction at a different time, the primary frequency modulation active power instruction is directly issued in the order of energy storage, photovoltaic data acquisition device 6, and wind turbine energy management device 5.

[0050] The primary frequency modulation algorithm of wind, solar and storage coordination is as follows: the primary frequency modulation device 2 determines the frequency fluctuation (i.e., frequency signal) of the grid connection point of the new energy station, and realizes the primary frequency modulation control of the new energy station by coordinating and controlling the active output of the whole station according to the preset primary frequency modulation curve. The control curve is as follows: Figure 2 As shown ( Figure 2 In, P max Indicates the maximum frequency modulation action target power, P min Indicates the minimum target power of a frequency modulation action, f max Indicates the maximum network frequency, f min Indicates the minimum network frequency, f d+ Indicates the upper limit of a frequency modulation action, f d- Represents the lower limit of the primary frequency regulation action). The new energy station realizes the primary frequency regulation function of the new energy station through the given active power-frequency droop characteristic curve; Among them, the new energy station realizes the primary frequency regulation function according to the active power-frequency droop characteristic curve function, and the formula is as follows:

[0051]

[0052] In the above formula, P represents the target power of a frequency modulation action, P0 represents the initial power value, and P N represents the rated power, f represents the actual network frequency, and f d Indicates the threshold value of a frequency modulation action, f N It represents the rated frequency, and δ% represents the primary frequency regulation rate of the new energy station.

[0053] Furthermore, the primary frequency modulation device 2 is also used to obtain the current energy storage SOC (state of charge, referring to the battery's state of charge, used to reflect the remaining capacity of the battery) of the energy storage unit, and to determine whether the energy storage SOC meets the requirements of the primary frequency modulation active power instruction. When the energy storage SOC meets the requirements of the primary frequency modulation active power instruction, the primary frequency modulation active power instruction is sent to the energy storage coordination controller 3 to achieve the locking of the energy storage energy limit energy management device; when the energy storage SOC cannot meet the requirements of the primary frequency modulation active power instruction, the primary frequency modulation device 2 transfers the power that the energy storage unit cannot meet to the photovoltaic digital acquisition device 6 for execution (that is, the energy storage SOC obtained by subtracting the requirements of the primary frequency modulation active power instruction from the current energy storage SOC is executed by the photovoltaic digital acquisition device 6). When the photovoltaic digital acquisition device 6 also does not meet the requirements of the primary frequency modulation active power instruction, the remaining power instruction is transferred to the wind turbine energy management device 5 for execution.

[0054] Specifically, when the frequency difference calculated by the grid-connected point frequency sensing device 1 is less than or equal to the set value, the primary frequency modulation sends a release signal to the automatic power generation control device 4. After receiving the release command, the automatic power generation control device 4 can normally send dispatching commands to the wind turbine energy management device 5, the photovoltaic data acquisition device 6, and the energy storage on-site energy management device 7, and the primary frequency modulation is completed.

[0055] The energy storage coordination controller 3 is used to perform a first control on the energy storage inverter 8 based on the primary frequency modulation active power instruction.

[0056] Specifically, the energy storage coordination controller 3 is also used to send a locking instruction to the energy storage inverter 8 based on the primary frequency modulation active power instruction, and send a release locking instruction to the energy storage inverter 8 after a preset delay time.

[0057] Furthermore, the energy storage coordination controller 3 responds to the primary frequency modulation active power instruction and can quickly control multiple energy storage units (ie, energy storage units composed of the energy storage inverter 8 and the battery).

[0058] The automatic power generation control device 4 is connected to the dispatching center, the wind turbine energy management device 5, the photovoltaic data acquisition device 6 and the on-site energy storage energy management device 7, and is used to obtain dispatching instructions, decompose the dispatching instructions into wind, solar and energy storage instructions, and send the wind, solar and energy storage instructions to the wind turbine energy management device 5, the photovoltaic data acquisition device 6 and the on-site energy storage energy management device 7.

[0059] Specifically, the automatic generation control device 4 (AGC for short) is also used to send the dispatch instruction to the primary frequency regulation device 2 based on the locking instruction.

[0060] Furthermore, after receiving the locking instruction, the automatic power generation control device 4 only accepts the dispatching instruction and forwards it to the frequency regulation device 2 once, and does not send the dispatching instruction to the wind turbine energy management device 5 (i.e., wind turbine EMS), the photovoltaic data acquisition device 6, and the energy storage local energy management device 7 (i.e., energy storage local EMS).

[0061] The above-mentioned energy storage on-site energy management device 7 is used to perform a second control on the above-mentioned energy storage inverter 8 based on the above-mentioned wind-solar-energy storage instruction.

[0062] Specifically, the energy storage on-site energy management device 7 controls the energy storage inverter 8 to charge and discharge the battery based on the above-mentioned wind-solar storage instructions.

[0063] The energy storage inverter 8 is connected to a battery and is used to control the battery to perform charging and discharging operations.

[0064] Specifically, the above-mentioned energy storage inverter 8 (i.e., energy storage PCS) is also used to lock and execute the instructions sent by the above-mentioned energy storage on-site energy management device 7 based on the above-mentioned locking instruction, and based on the above-mentioned unlocking instruction, obtain and execute the wind and solar storage instructions at the next moment sent by the above-mentioned energy storage on-site energy management device 7.

[0065] Furthermore, after receiving the locking instruction, the energy storage inverter 8 will lock the instructions issued by the on-site energy management device 7 for executing the energy storage, and only execute the instructions issued by the energy storage coordination controller 3. After unlocking, the energy storage inverter 8 maintains the instructions before unlocking. When the on-site energy management device 7 for energy storage receives a new instruction issued by the automatic power generation control device 4, the energy storage inverter 8 executes the instruction of the on-site energy management device 7 for energy storage.

[0066] The above-mentioned wind-solar-storage coordinated primary frequency regulation system realizes the control of battery charging and discharging through the energy storage inverter through the coordination between the energy storage coordination controller and the energy storage on-site energy management device, breaking through the bottleneck of wind-solar-storage coordinated primary frequency regulation, and shortening the primary frequency regulation response time from seconds to milliseconds, that is, realizing the rapid and active support of new energy + energy storage for the grid frequency; and, by limiting the priority between the wind turbine energy management device, the photovoltaic data acquisition device, and the energy storage on-site energy management device, the wind and solar reserved capacity standby is reduced, thereby improving the economic benefits.

[0067] like Figure 3 As shown, the working process of a wind-solar-storage coordinated primary frequency regulation system is explained below through a specific embodiment.

[0068] The grid-connected point frequency sensing device 1 converts the collected grid-connected point AC voltage cycle into a frequency signal in real time and outputs it to the primary frequency modulation device 2. The primary frequency modulation device 2 integrates the wind, solar and energy storage coordinated primary frequency modulation algorithm, compares the received frequency signal with 50Hz, and when the frequency difference is greater than the set value, the primary frequency modulation sends a blocking signal to the automatic power generation control device 4, and synthesizes the dispatching instruction received from the automatic power generation control device 4 with the power instruction converted from the frequency difference according to its own algorithm (the dispatching instruction and the frequency difference conversion instruction are superimposed in the same direction, and the dispatching instruction is blocked in the opposite direction), and sends instructions in the order of the energy storage coordination controller 3, photovoltaic data acquisition, and wind turbine energy management device 5;

[0069] After receiving the locking command, the automatic power generation control device 4 only accepts the dispatching command and forwards it to the frequency regulation device 2 once, and does not send the dispatching command to the wind turbine energy management device 5, the photovoltaic data acquisition device 6, and the energy storage on-site energy management device 7.

[0070] The energy storage coordination controller 3 receives a frequency modulation instruction, and first sends a locking instruction to the energy storage inverter 8, and then sends an unlocking instruction to the energy storage inverter 8 after a certain delay. After receiving the locking instruction, the energy storage inverter 8 will lock and execute the instructions issued by the energy storage on-site energy management device 7, and only execute the instructions issued by the energy storage coordination controller 3. After unlocking, the energy storage inverter 8 maintains the instructions before unlocking. When the energy storage on-site energy management device 7 receives a new instruction issued by the automatic power generation control device 4, the energy storage inverter 8 executes the instructions of the energy storage on-site energy management device 7.

[0071] When the frequency difference calculated by the grid-connected point frequency sensing device 1 is less than or equal to the set value, the primary frequency modulation sends a release signal to the automatic power generation control device 4. After receiving the release command, the automatic power generation control device 4 can normally send dispatching commands to the wind turbine energy management device 5, the photovoltaic data acquisition device 6, and the energy storage on-site energy management device 7, and the primary frequency modulation ends.

[0072] Example 2

[0073] This embodiment provides a primary frequency modulation method for wind, solar and energy storage coordination, such as Figure 4 As shown, including:

[0074] S401. The grid connection point frequency sensing device collects the grid connection point AC voltage cycle, converts the grid connection point AC voltage cycle into a frequency signal, and transmits the frequency signal to a primary frequency modulation device.

[0075] Specifically, the grid connection point frequency sensing device converts the collected grid connection point AC voltage cycle into a frequency signal in real time and outputs it to the primary frequency modulation device, wherein the calculation formula of the frequency signal is:

[0076] f=1 / t

[0077] In the above formula, f represents the frequency signal, and t represents the AC voltage period at the grid connection point.

[0078] S402. The primary frequency modulation device generates a primary frequency modulation active power instruction based on the frequency signal, and sends the primary frequency modulation active power instruction to the wind turbine energy management device, the photovoltaic data acquisition device and the energy storage coordination controller.

[0079] Specifically, the primary frequency modulation device is also used to calculate the frequency difference between the frequency signal and the preset frequency. When the frequency difference is greater than the set value, a locking instruction is sent to the automatic power generation control device, and the frequency difference is converted into the primary frequency modulation active power instruction. The active power instruction is compared with the dispatching instruction sent by the automatic power generation control device to generate a synthetic instruction, and the synthetic instruction is sent to the wind turbine energy management device, the photovoltaic data acquisition device and the energy storage coordination controller.

[0080] Furthermore, the primary frequency modulation device integrates the primary frequency modulation algorithm of wind, solar and energy storage coordination, and takes the absolute value of the frequency signal minus the preset frequency of 50Hz as the frequency difference. When the frequency difference is greater than the set value, the primary frequency modulation sends a locking command to the automatic power generation control device. When the automatic power generation control device sends a dispatching command and the primary frequency modulation active power command is obtained at the same time, the dispatching command received from the automatic power generation control device is synthesized with the primary frequency modulation active power command converted from the frequency difference according to its own algorithm, that is, the dispatching command and the primary frequency modulation active power command are superimposed in the same direction to generate a synthesized command, and issued in the order of energy storage (that is, issued by the energy storage coordination controller to the energy storage inverter), photovoltaic data acquisition device, and wind turbine energy management device; in the opposite direction, the dispatching command is locked, and the primary frequency modulation active power command is directly issued in the order of energy storage, photovoltaic data acquisition device, and wind turbine energy management device; when the automatic power generation control device sends a dispatching command and the primary frequency modulation active power command is obtained at different times, the primary frequency modulation active power command is directly issued in the order of energy storage, photovoltaic data acquisition device, and wind turbine energy management device.

[0081] Among them, the primary frequency regulation algorithm of wind, solar and storage coordination is as follows: the primary frequency regulation device determines the frequency fluctuation (i.e. frequency signal) of the grid connection point of the new energy station, and realizes the primary frequency regulation control of the new energy station by coordinating and controlling the active power output of the whole station according to the preset primary frequency regulation curve. The new energy station realizes the primary frequency regulation function of the new energy station through the given active power-frequency droop characteristic curve; among them, the new energy station realizes the primary frequency regulation function according to the active power-frequency droop characteristic curve function, and the formula is as follows:

[0082]

[0083] In the above formula, P represents the target power of a frequency modulation action, P0 represents the initial power value, and P N represents the rated power, f represents the actual network frequency, and f d Indicates the threshold value of a frequency modulation action, f N It represents the rated frequency, and δ% represents the primary frequency regulation rate of the new energy station.

[0084] Furthermore, the primary frequency modulation device is also used to obtain the current energy storage SOC (state of charge, which refers to the battery's state of charge, used to reflect the remaining capacity of the battery) of the energy storage unit, and to determine whether the energy storage SOC meets the requirements of the primary frequency modulation active power instruction. When the energy storage SOC meets the requirements of the primary frequency modulation active power instruction, the primary frequency modulation active power instruction is sent to the energy storage coordination controller to achieve the locking of the energy storage energy limit energy management device; when the energy storage SOC cannot meet the requirements of the primary frequency modulation active power instruction, the primary frequency modulation device transfers the power that the energy storage unit cannot meet to the photovoltaic digital acquisition device for execution (that is, the energy storage SOC obtained by subtracting the requirements of the primary frequency modulation active power instruction from the current energy storage SOC is executed by the photovoltaic digital acquisition device). When the photovoltaic digital acquisition device also does not meet the requirements of the primary frequency modulation active power instruction, the remaining power instruction is transferred to the wind turbine energy management device for execution.

[0085] Specifically, when the frequency difference calculated by the frequency sensing device at the grid connection point is less than or equal to the set value, the primary frequency modulation sends a release signal to the automatic power generation control device. After receiving the release command, the automatic power generation control device can normally send dispatching commands to the wind turbine energy management device, photovoltaic data acquisition device, and energy storage on-site energy management device, and the primary frequency modulation ends.

[0086] S403: The energy storage coordination controller performs a first control on the energy storage inverter based on the primary frequency modulation active power instruction.

[0087] Specifically, the energy storage coordination controller is further used to send a locking instruction to the energy storage inverter based on the primary frequency modulation active power instruction, and send a release locking instruction to the energy storage inverter after a preset delay time.

[0088] Furthermore, the energy storage coordination controller responds to a primary frequency modulation active power instruction and can quickly control multiple energy storage units (ie, energy storage units composed of energy storage inverters and batteries).

[0089] S404, the automatic power generation control device obtains the dispatching instruction, decomposes the above dispatching instruction into wind, solar and energy storage instructions, and sends the above wind, solar and energy storage instructions to the above wind turbine energy management device, the above photovoltaic data acquisition device and the energy storage on-site energy management device.

[0090] Specifically, the automatic generation control device (AGC for short) is also used to send the dispatching instruction to the primary frequency regulation device based on the locking instruction.

[0091] Furthermore, when the automatic power generation control device receives the locking command, it only accepts the dispatching command and forwards it to the frequency regulation device once, and does not send the dispatching command to the wind turbine energy management device (i.e. wind turbine EMS), photovoltaic data acquisition device, and energy storage local energy management device (i.e. energy storage local EMS).

[0092] S405. The above-mentioned on-site energy storage energy management device performs a second control on the above-mentioned energy storage inverter based on the above-mentioned wind-solar-energy storage instruction.

[0093] Specifically, the on-site energy storage energy management device controls the energy storage inverter to charge and discharge the battery based on the above-mentioned wind-solar-storage instructions.

[0094] S406, the energy storage inverter controls the battery to perform charging and discharging operations.

[0095] Specifically, the above-mentioned energy storage inverter (i.e., energy storage PCS) is also used to lock and execute the instructions sent by the above-mentioned energy storage on-site energy management device based on the above-mentioned locking instruction, and based on the above-mentioned unlocking instruction, obtain and execute the wind and solar storage instructions at the next moment sent by the above-mentioned energy storage on-site energy management device.

[0096] Furthermore, after receiving the locking instruction, the energy storage PCS will lock the instructions issued by the on-site energy management device of the energy storage and only execute the instructions issued by the energy storage coordination controller. After unlocking, the energy storage PCS maintains the instructions before unlocking. When the on-site energy management device of the energy storage receives a new instruction issued by the automatic power generation control device, the energy storage PCS executes the instructions of the on-site energy management device of the energy storage.

[0097] The above-mentioned method of primary frequency regulation in coordination between wind, solar and storage realizes the control of battery charging and discharging through the energy storage inverter through the coordination between the energy storage coordination controller and the energy storage on-site energy management device, breaking through the bottleneck of primary frequency regulation in coordination between wind, solar and storage, and shortening the primary frequency regulation response time from seconds to milliseconds, thereby realizing the rapid and active support of new energy + energy storage for the grid frequency; and, by limiting the priority between the wind turbine energy management device, the photovoltaic data acquisition device, and the energy storage on-site energy management device, the reserved capacity of wind and solar power is reduced, thereby improving the economic benefits.

[0098] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A wind, solar and energy storage coordinated primary frequency modulation system, characterized in that: include: Grid connection point frequency sensing device, primary frequency modulation device, energy storage coordination controller, automatic power generation control device, wind turbine energy management device, photovoltaic data acquisition device, energy storage on-site energy management device and energy storage inverter; The grid connection point frequency sensing device is used to collect the grid connection point AC voltage cycle, convert the grid connection point AC voltage cycle into a frequency signal, and transmit the frequency signal to the primary frequency modulation device; The primary frequency modulation device is connected to the wind turbine energy management device, the photovoltaic data acquisition device and the energy storage coordination controller, and is used to generate a primary frequency modulation active power instruction based on the frequency signal, and send the primary frequency modulation active power instruction to the wind turbine energy management device, the photovoltaic data acquisition device and the energy storage coordination controller; The energy storage coordination controller is used to perform a first control on the energy storage inverter based on the primary frequency modulation active power instruction; The automatic power generation control device is connected to the dispatching center, the wind turbine energy management device, the photovoltaic data acquisition device and the energy storage on-site energy management device, and is used to obtain dispatching instructions, decompose the dispatching instructions into wind, solar and energy storage instructions, and send the wind, solar and energy storage instructions to the wind turbine energy management device, the photovoltaic data acquisition device and the energy storage on-site energy management device; The energy storage on-site energy management device is used to perform a second control on the energy storage inverter based on the wind-solar-storage instruction; The energy storage inverter is connected to a battery and is used to control the battery to perform charging and discharging operations; The energy storage coordination controller is further used to send a locking instruction to the energy storage inverter based on the primary frequency modulation active power instruction, and send a release locking instruction to the energy storage inverter after a preset delay time; The energy storage inverter is also used to lock the execution of the instructions sent by the energy storage on-site energy management device based on the locking instruction, and to obtain and execute the wind-solar storage instructions for the next moment sent by the energy storage on-site energy management device based on the unlocking instruction.

2. A wind-solar-storage coordinated primary frequency modulation system according to claim 1, characterized in that: The primary frequency modulation device is also used to calculate the frequency difference between the frequency signal and the preset frequency. When the frequency difference is greater than the set value, a locking instruction is sent to the automatic power generation control device, and the frequency difference is converted into the primary frequency modulation active power instruction. The active power instruction is compared with the scheduling instruction sent by the automatic power generation control device to generate a synthetic instruction, and the synthetic instruction is sent to the wind turbine energy management device, the photovoltaic data acquisition device and the energy storage coordination controller.

3. The wind-solar-storage coordinated primary frequency modulation system according to claim 2 is characterized in that: The automatic power generation control device is also used to send the dispatching instruction to the primary frequency regulation device based on the locking instruction.

4. A wind-solar-storage coordinated primary frequency modulation method, characterized in that: include: The grid connection point frequency sensing device collects the grid connection point AC voltage cycle, converts the grid connection point AC voltage cycle into a frequency signal, and transmits the frequency signal to the primary frequency modulation device; The primary frequency modulation device generates a primary frequency modulation active power instruction based on the frequency signal, and sends the primary frequency modulation active power instruction to the wind turbine energy management device, the photovoltaic data acquisition device and the energy storage coordination controller; The energy storage coordination controller performs a first control on the energy storage inverter based on the primary frequency modulation active power instruction; The automatic power generation control device obtains the dispatching instruction, decomposes the dispatching instruction into wind, solar and energy storage instructions, and sends the wind, solar and energy storage instructions to the wind turbine energy management device, the photovoltaic data acquisition device and the energy storage on-site energy management device; The energy storage on-site energy management device performs a second control on the energy storage inverter based on the wind-solar storage instruction; The energy storage inverter controls the battery to perform charging and discharging operations; The energy storage coordination controller performs a first control on the energy storage inverter based on the primary frequency modulation active power instruction, including: The energy storage coordination controller sends a locking instruction to the energy storage inverter based on the primary frequency modulation active power instruction, and sends a release locking instruction to the energy storage inverter after a preset delay time; Also includes: The energy storage inverter locks and executes the instruction sent by the energy storage on-site energy management device based on the locking instruction, and obtains and executes the wind-solar-storage instruction of the next moment sent by the energy storage on-site energy management device based on the unlocking instruction.

5. A wind-solar-storage coordinated primary frequency modulation method according to claim 4, characterized in that: The primary frequency modulation device generates a primary frequency modulation active power instruction based on the frequency signal, and sends the primary frequency modulation active power instruction to the wind turbine energy management device, the photovoltaic data acquisition device and the energy storage coordination controller, including: The frequency difference between the frequency signal and the preset frequency is calculated. When the frequency difference is greater than the set value, a locking instruction is sent to the automatic power generation control device, and the frequency difference is converted into the primary frequency modulation active power instruction. The active power instruction is compared with the dispatching instruction sent by the automatic power generation control device to generate a synthetic instruction, and the synthetic instruction is sent to the wind turbine energy management device, the photovoltaic data acquisition device and the energy storage coordination controller.

6. A wind-solar-storage coordinated primary frequency modulation method according to claim 5, characterized in that: Also includes: The automatic power generation control device sends the dispatch instruction to the primary frequency regulation device based on the locking instruction.

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