A new energy station centralized coordination control method and device

Abstract

This invention discloses a centralized coordinated control method and device for new energy power plants, applicable to photovoltaic (PV) and energy storage coordinated control. It calculates inertia response and low-voltage ride-through strategies by collecting grid connection point parameters of the power plant's main circuit, and completes centralized coordinated control of the PV energy storage system's inertia response and low-voltage ride-through under dynamic operating conditions through current distribution logic. Utilizing the centralized coordinated control method, a centralized coordinated control device is proposed, including a PV energy storage coordinated controller, a PV coordinated controller, and an energy storage coordinated controller. This device enables centralized coordinated control of each converter unit within the new energy power plant for dynamic performance optimization. This invention is suitable for optimizing the dynamic performance of new energy power plants, achieving centralized coordinated control of low-voltage ride-through and inertia response under dynamic operating conditions, improving response consistency, and allowing for the setting of different control strategies according to different user needs, thus enabling multi-purpose development.

Description

Technical Field

[0001] This invention relates to a centralized coordinated control method and device for new energy power plants, belonging to the field of grid-connected operation of photovoltaic energy storage systems. Background Technology

[0002] With the large-scale integration of new energy power generation into the grid, its intermittent, fluctuating, and random characteristics are increasing the challenges to the safe and stable operation of the grid, and also hindering the grid's absorption of new energy.

[0003] Configuring energy storage for renewable energy generation can mitigate the randomness and volatility of power generation. However, in currently operational renewable energy power plants with energy storage systems, these systems are primarily used for steady-state peak shaving and frequency regulation. The dynamic and transient support functions of energy storage at renewable energy power plants, especially under fault conditions, need further improvement. The active and reactive power support capabilities of energy storage for the power grid during grid anomalies have not been fully explored, and the dynamic support function of the power grid has not been fully utilized.

[0004] Currently, the existing strategies for supporting functions under transient conditions are basically implemented by the converter itself. However, considering the increasing number of new energy power plants and energy storage converters, due to the decentralized nature of information collection within each converter, the converters will respond inconsistently to grid transient conditions. This inconsistency in response will lead to cross-interference between converters, affecting the real-time performance and accuracy of the plant's response to grid transient conditions. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a centralized coordinated control method and device for new energy power stations. By collecting grid connection point parameter information of the main circuit of the power station, the method performs inertia response and low voltage ride-through strategy calculations. Through current distribution logic, the method completes the centralized coordinated control of the inertia response and low voltage ride-through of the photovoltaic energy storage system under dynamic operating conditions, thereby improving the consistency of the response.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A centralized coordinated control method for new energy power plants is disclosed, applicable to the coordinated control of photovoltaic converter units and energy storage converter units in new energy power plants. The centralized coordinated control method includes a low-voltage ride-through centralized control method and an inertia response centralized control method.

[0008] The low-voltage ride-through centralized control method includes the following steps:

[0009] (11) Collect the grid connection voltage of the new energy power station, and calculate the grid connection frequency and voltage amplitude based on the grid connection voltage;

[0010] (12) Based on the voltage amplitude, determine whether to switch to the low voltage ride-through state, i.e. switch from steady state to low voltage ride-through state; if so, proceed to (13).

[0011] (13) Implement the strategy of low voltage ride-through response to generate low voltage state switching signal and reactive current reference signal;

[0012] (14) The generated low voltage state switching signal and reactive current reference signal are sent to the photovoltaic converter unit and the energy storage converter unit after passing through the current distribution logic.

[0013] The centralized control method for inertia response includes the following steps:

[0014] (21) Collect the grid connection voltage of the new energy power station, and calculate the grid connection frequency, voltage amplitude and grid connection frequency change rate based on the grid connection voltage;

[0015] (22) The noise mixed in the frequency change rate is filtered out by the variable parameter filter to obtain the frequency change rate after the variable parameter filter. The inertial response state is enabled based on the frequency change rate after the variable parameter filter. If it is enabled, then proceed to (23).

[0016] (23) Implement the inertia response strategy and generate the active reference value corresponding to the inertia response;

[0017] (24) The generated active power reference value is sent to the photovoltaic converter unit and the energy storage converter unit after passing through the current distribution logic.

[0018] As a preferred embodiment of the present invention, in step (12), determining whether to perform a low-voltage ride-through state switch based on the voltage amplitude specifically involves:

[0019] If the voltage amplitude |U pcc |< 迟滞 U 门槛 If the voltage is low, then a low-voltage ride-through state switch will be performed; otherwise, no switch will be performed. 门槛 This is the voltage threshold value.

[0020] As a preferred embodiment of the present invention, step (13) further includes calculating the required time for low voltage ride-through and determining whether the required time for low voltage ride-through has exceeded the time limit. If the time limit has exceeded the time limit, a timeout status information is sent out.

[0021] As a preferred embodiment of the present invention, in step (21), a frequency-locked loop (FLL) is used to obtain the grid connection point frequency and the rate of change of the grid connection point frequency, as follows:

[0022] 1) The grid connection point voltage u pcc The voltage u is obtained after Clark transformation. αβ ;

[0023] 2) Voltage u αβ After the second-order generalized integral, two sets of orthogonal signals v are generated. αβ and qv αβ ;

[0024] 3) via u αβ v αβ and qv αβ Perform cross-product frequency discrimination to estimate the frequency deviation ε f ;

[0025] 4) Use a loop filter to reduce the frequency deviation ε f Perform zero-static-error tracking to obtain the angular acceleration β;

[0026] 5) Based on the angular acceleration, the angular velocity ω is obtained using a voltage-controlled oscillator. The angular velocity ω is also applied to the second-order generalized integral in 2) to generate an orthogonal signal.

[0027] 6) The grid connection point frequency f and the rate of change of the grid connection point frequency can be obtained from the angular velocity ω and angular acceleration β.

[0028] As a preferred embodiment of the present invention, in step (22), determining whether to enable the inertial response state based on the frequency change rate after variable parameter filtering is specifically as follows:

[0029] If the following conditions are met: If so, the inertial response state will switch; otherwise, it will not switch. Δf represents the frequency change rate after variable parameter filtering, and Δf represents the frequency deviation.

[0030] A centralized coordinated control device for a new energy power station includes a photovoltaic energy storage coordinated controller, a photovoltaic coordinated controller, and an energy storage coordinated controller. The photovoltaic energy storage coordinated controller is located at the upper level of the control system and controls the subordinate photovoltaic coordinated controller and energy storage coordinated controller. The photovoltaic coordinated controller and energy storage coordinated controller respectively control the subordinate photovoltaic converter unit and energy storage converter unit.

[0031] The photovoltaic energy storage coordination controller includes: an information acquisition unit, a first upper-level command communication unit, a control unit, a first lower-level command communication unit, and a first status information display unit;

[0032] The information acquisition unit is used to collect the grid connection point voltage of the new energy power station, and calculate the grid connection point frequency, voltage amplitude and grid connection point frequency change rate based on the grid connection point voltage;

[0033] The first upper-layer instruction communication unit is used to receive external control instructions, including active power, reactive power, current instruction values, and start / stop and enable function mode instructions.

[0034] The control unit is used to generate control commands for the subordinate photovoltaic coordinating controller and energy storage coordinating controller according to external control commands;

[0035] The first lower-level command communication unit is used to obtain the operating status of the subordinate photovoltaic coordinating controller and energy storage coordinating controller, obtain the active power and reactive power of each photovoltaic converter unit under the photovoltaic coordinating controller, obtain the active power, reactive power and SOC value of each energy storage converter unit under the energy storage coordinating controller, and send the command generated by the control unit to the subordinate photovoltaic coordinating controller and energy storage coordinating controller.

[0036] The first status information display unit is used to display the operating status of the photovoltaic energy storage coordination controller;

[0037] The photovoltaic coordination controller includes: a second upper-level command communication unit, a second functional control unit, a second lower-level command communication unit, and a second status information display unit; the energy storage coordination controller includes: a third upper-level command communication unit, a third functional control unit, a third lower-level command communication unit, and a third status information display unit.

[0038] The second upper-layer command communication unit is used to communicate with the photovoltaic energy storage coordination controller to obtain control commands, including active power, reactive power, current command values, and start / stop and enable function mode commands.

[0039] The second functional control unit is used to implement the low voltage ride-through centralized control method in the centralized coordinated control method for new energy power stations as described above.

[0040] The second lower-level command communication unit is used to obtain the operating status of the subordinate photovoltaic converter units and to obtain the active power and reactive power of each photovoltaic converter unit;

[0041] The second status information display unit is used to display the operating status of the photovoltaic coordination controller;

[0042] The third upper-layer command communication unit is used to communicate with the photovoltaic energy storage coordination controller to obtain control commands, including active power, reactive power, current command values, and start / stop and enable function mode commands.

[0043] The third functional control unit is used to implement the inertia response centralized control method in the centralized coordinated control method for new energy power stations as described above.

[0044] The third lower-level command communication unit is used to obtain the operating status of the subordinate energy storage converter units and to obtain the active power, reactive power, and SOC value of each energy storage converter unit.

[0045] The third status information display unit is used to display the operating status of the energy storage coordination controller.

[0046] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor executes the computer program to implement the steps of the centralized coordinated control method for new energy power stations as described above.

[0047] A computer-readable storage medium storing a computer program, characterized in that, when executed by a processor, the computer program implements the steps of the centralized coordinated control method for new energy power stations as described above.

[0048] Compared with the prior art, the present invention, employing the above technical solution, has the following technical effects:

[0049] 1. This invention is applicable to photovoltaic coordinated control and energy storage coordinated control. It collects grid connection point parameter information of the main circuit of the power station to calculate the inertia response and low voltage ride-through strategy, and completes the centralized coordinated control of the photovoltaic energy storage system's inertia response and low voltage ride-through under dynamic operating conditions through current distribution logic.

[0050] 2. This invention avoids the data collection dispersion caused by each converter only collecting its own information by collecting parameter information of the main circuit grid connection point, and centrally performs dynamic coordination control optimization to improve the consistency of the system's dynamic response.

[0051] 3. This invention is easily expandable and is applicable to both large-scale and small-scale new energy power plants. Attached Figure Description

[0052] Figure 1 This is a flowchart of the centralized coordination control method in an embodiment of the present invention;

[0053] Figure 2 This is a schematic diagram of the system architecture of the centralized coordination and control device in an embodiment of the present invention;

[0054] Figure 3 This is a schematic diagram of another system architecture for the centralized coordination and control device in this embodiment of the invention. Detailed Implementation

[0055] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0056] This invention proposes a centralized coordinated control method for new energy power plants, applicable to both photovoltaic and energy storage coordinated control. By collecting grid connection point parameter information of the power plant's main circuit, it performs inertia response and low-voltage ride-through strategy calculations, and through current distribution logic, completes centralized coordinated control of low-voltage ride-through and inertia response of the photovoltaic energy storage system under dynamic operating conditions.

[0057] like Figure 1 As shown, this invention avoids the data collection dispersion for the station caused by each converter only collecting its own information by collecting parameter information of the main circuit grid connection point; after collecting the main circuit information, it performs relevant strategy calculations for low voltage ride-through and inertia response; finally, it obtains the command organization signal of each converter through current distribution logic.

[0058] The low-voltage ride-through centralized control method comprises the following steps:

[0059] S01, Collect grid connection point voltage u pcc And calculate the grid connection point frequency f based on the voltage. pcc Voltage amplitude |U pcc |;

[0060] S02. Based on information such as the current voltage amplitude, determine whether to switch to low-voltage ride-through mode;

[0061] (1) When the condition |U is satisfied pcc |< 迟滞 U 门槛 At that time, a low-voltage state switching signal is generated; and a low-voltage response strategy is executed; wherein, the reactive current I of the photovoltaic converter and the energy storage converter... T The expressions are as follows:

[0062]

[0063]

[0064] In the formula, I T光伏 I T储能 These are the per-unit reactive current values ​​for the photovoltaic converter unit and the energy storage converter unit, respectively, U. T The voltage per unit amplitude is as described above | U pcc (The same applies below); I T It is issued as a reactive power reference value.

[0065] (2) Calculate the required time for low-voltage ride-through;

[0066]

[0067]

[0068] In the formula, tT光伏 t T储能 These are the required low-voltage ride-through times for the photovoltaic converter unit and the energy storage converter unit, respectively, in seconds; interp1() is a linear interpolation function.

[0069] (3) Determine if the low-voltage ride-through time has exceeded the limit; the low-voltage ride-through time is calculated as follows:

[0070]

[0071] When T since >t T When this occurs, it indicates a low-voltage ride-through timeout, and this status information is sent out.

[0072] S03. If the switching conditions are met, execute the low voltage ride-through response strategy to generate a low voltage state signal and a reactive current reference signal.

[0073] S04. The generated low voltage state signal and reactive current reference signal, after passing through the current distribution logic, are sent to the photovoltaic coordination control device and energy storage coordination control device attached to the photovoltaic energy storage coordination control device, and finally sent to each energy storage converter and photovoltaic converter unit, or directly sent to the photovoltaic converter unit and energy storage converter unit.

[0074] The issued reactive power reference value is:

[0075]

[0076] In the formula, I q (k) represents the instruction value corresponding to the k-th converter, and F(·) represents the algorithm corresponding to the current distribution logic.

[0077] The centralized control method for inertia response comprises the following steps:

[0078] (21) Collect grid connection point voltage u pcc And calculate the grid connection point frequency f based on the voltage. pcc Voltage amplitude |U pcc | The rate of change of frequency at the grid connection point, i.e., angular acceleration β pcc ;

[0079] Here, a frequency-locked loop (FLL) is used to obtain the frequency f. pcc and angular acceleration β pcc The signal and specific strategy are as follows:

[0080] 1)u pcc After the abc->dq transformation, we obtain u. αβ ;

[0081] 2)u αβ After the second-order generalized integral, two sets of orthogonal signals v are generated.αβ ,qv αβ , respectively corresponding to u α and u β ,qv α and qv β Orthogonal;

[0082] 3) Simplified cross-product frequency discrimination to estimate frequency deviation ε f ;

[0083]

[0084] In the formula, This represents the sampled value of vector u at time n. This represents the sampled value of vector v at time n-1. This represents the sampled value of vector qv at time n;

[0085] 4) Regarding frequency deviation ε f The signal is subjected to a loop filter to obtain the angular acceleration β = LF(ε f );

[0086] 5) The voltage-controlled oscillator obtains the angular frequency, which is then used to generate orthogonal signals through a second-order generalized integral.

[0087] The frequency f and the rate of change of frequency can be obtained from the angular velocity ω and angular acceleration β.

[0088] (22) Based on the current frequency change rate, frequency deviation, and derivative condition of frequency deviation energy, determine whether to enable the inertial response state.

[0089] (1) Rate of change of frequency A variable-parameter filter is used to filter out noise that may be aliased. The variable-parameter filter frequency is... and Positive correlation;

[0090] This variable-parameter filter can be cascaded multiple times, and in this case, the filter's corresponding angular frequency is positively correlated with the absolute value of the input signal of this stage.

[0091] (2) The inertial response function enters the switching state when the following conditions are met;

[0092]

[0093] (3) Once the conditions are met, the inertial response function enters the switching state and obtains the power per unit command value;

[0094]

[0095] In the formula, T Jf is the inertial time constant of the wind farm, in seconds, typically ranging from 4 to 12 seconds; N This is the rated frequency, typically 50Hz; This represents the rate of frequency change after the variable parameter filtering described above.

[0096] (23) If the response conditions are met, execute the inertia response strategy and generate the active reference value corresponding to the inertia response.

[0097] (24) The generated active reference value is sent to the photovoltaic coordination control device and energy storage coordination control device attached to the photovoltaic energy storage coordination control device after passing through the current distribution logic, and finally sent to each energy storage converter and photovoltaic converter unit, or directly sent to the photovoltaic converter unit and energy storage converter unit.

[0098]

[0099] In the formula, P(k) is the command value corresponding to the k-th group of converters, and F(·) is the algorithm corresponding to the current distribution logic; P * The steady-state power output value; ∑ΔP i The active power command value is for other constraints.

[0100] This invention also proposes a centralized coordinated control device for new energy power plants, including a photovoltaic energy storage coordinated controller, a photovoltaic coordinated controller, and an energy storage coordinated controller; see system architecture diagram. Figure 2 As shown, the photovoltaic energy storage coordination controller is located at the upper level of the control system, controlling the subordinate photovoltaic coordination controller and energy storage coordination controller; the photovoltaic coordination controller and energy storage coordination controller control the subordinate photovoltaic converter unit and energy storage converter unit, respectively.

[0101] The photovoltaic energy storage coordination controller includes: an information acquisition unit, an upper-level command communication unit, a control unit, a lower-level command communication unit, and a status information display unit.

[0102] The information acquisition unit is used to acquire information from the main circuit of the system, including but not limited to the grid connection point voltage, and to calculate the grid connection point frequency, angular frequency and voltage amplitude based on the voltage.

[0103] The upper-level command communication unit is used to communicate with the remote dispatch system or the local monitoring system to obtain control commands, including active power, reactive power, current command values, and start / stop and enable function mode commands.

[0104] The control unit, as described above, is used to achieve centralized control of the system using the centralized coordination control method.

[0105] The lower-level command communication unit communicates with the lower-level control devices, obtains the operating status of the lower level, obtains the active power and reactive power of each sub-unit in the photovoltaic unit, obtains the active power, reactive power and SOC value of each sub-unit in the energy storage unit, and sends the control commands generated by the functional control unit to each lower-level control unit.

[0106] A status information display unit is used to display the operating status and related warning information of the LCD device;

[0107] Among the above units, the information acquisition unit transmits the acquired information to the function control unit; the upper-level instruction communication unit transmits instructions and information to the function control unit; the lower-level instruction communication unit transmits instructions and information to the function control unit; and the status information display unit receives information from the function control unit.

[0108] Both the photovoltaic coordinating controller and the energy storage coordinating controller include: an upper-level command communication unit, a function control unit, a lower-level command communication unit, and a status information display unit.

[0109] The upper-level command communication unit is used to communicate with the photovoltaic energy storage coordination control device to obtain control commands, including active power, reactive power, current command values, and start / stop and enable function mode commands.

[0110] The functional control unit, using the aforementioned centralized coordination control method, is used to achieve centralized control of the system;

[0111] The lower-level command communication unit communicates with the lower-level control devices, obtains the operating status of the lower level, obtains the active power and reactive power of each sub-unit in the photovoltaic unit, obtains the active power, reactive power and SOC value of each sub-unit in the energy storage unit, and sends the control commands generated by the functional control unit to each lower-level control unit.

[0112] A status information display unit is used to display the operating status and related warning information of the LCD device;

[0113] Among the above units, the upper-level instruction communication unit transmits instructions and information to the function control unit; the lower-level instruction communication unit transmits instructions and information to the function control unit; and the status information display unit receives information from the function control unit.

[0114] The photovoltaic energy storage coordination controller, photovoltaic coordination controller, and energy storage coordination controller are configured in different numbers depending on the system size; the photovoltaic coordination controller and energy storage coordination controller can still support the configuration of coordination controllers at lower levels, realizing the hierarchical expansion of the coordination control device.

[0115] See the schematic diagram of another system architecture proposed in this invention. Figure 3As shown, the photovoltaic energy storage coordinating controller can also directly coordinate and control the photovoltaic converter unit and the energy storage converter unit, realizing flexible coordination and control for small system stations.

[0116] Based on the same inventive concept, this application provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the aforementioned centralized coordination control method for new energy power stations.

[0117] Based on the same inventive concept, embodiments of this application provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the aforementioned centralized coordinated control method for new energy power stations.

[0118] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0119] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0120] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0121] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0122] The above embodiments are merely illustrative of the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solutions based on the technical concept proposed in this invention shall fall within the scope of protection of this invention.

Claims

1. A centralized coordinated control method for new energy power plants, applicable to the coordinated control of photovoltaic converter units and energy storage converter units in new energy power plants, characterized in that, The centralized coordinated control method includes a low-voltage ride-through centralized control method and an inertia response centralized control method, wherein... The low-voltage ride-through centralized control method includes the following steps: (11) Collect the grid connection voltage of the new energy power station, and calculate the grid connection frequency and voltage amplitude based on the grid connection voltage; (12) Based on the voltage amplitude, determine whether to switch to the low voltage ride-through state, i.e. switch from steady state to low voltage ride-through state; if so, proceed to (13). (13) Implement the strategy of low voltage ride-through response to generate low voltage state switching signal and reactive current reference signal; (14) The generated low voltage state switching signal and reactive current reference signal are sent to the photovoltaic converter unit and the energy storage converter unit after passing through the current distribution logic. The centralized control method for inertia response includes the following steps: (21) Collect the grid connection voltage of the new energy power station, and calculate the grid connection frequency, voltage amplitude and grid connection frequency change rate based on the grid connection voltage; (22) The noise mixed in the frequency change rate is filtered out by the variable parameter filter to obtain the frequency change rate after the variable parameter filter. The inertial response state is enabled based on the frequency change rate after the variable parameter filter. If it is enabled, then proceed to (23). (23) Implement the inertia response strategy and generate the active reference value corresponding to the inertia response; (24) The generated active power reference value is sent to the photovoltaic converter unit and the energy storage converter unit after passing through the current distribution logic.

2. The centralized coordinated control method for new energy power stations according to claim 1, characterized in that, In (12), the determination of whether to perform a low-voltage ride-through state switch based on the voltage amplitude is as follows: If the voltage amplitude |U pcc |< 迟滞 U 门槛 If the voltage is low, then a low-voltage ride-through state switch will be performed; otherwise, no switch will be performed. 门槛 This is the voltage threshold value.

3. The centralized coordinated control method for new energy power stations according to claim 1, characterized in that, The (13) also includes calculating the required time for low voltage ride-through and determining whether the required time for low voltage ride-through has exceeded the time limit. If the time limit has exceeded the time limit, the time limit status information is sent out.

4. The centralized coordinated control method for new energy power stations according to claim 1, characterized in that, In (21), the grid connection point frequency and the rate of change of the grid connection point frequency are obtained by using a frequency-locked loop (FLL), as follows: 1) The grid connection point voltage u pcc The voltage u is obtained after Clark transformation. αβ ; 2) Voltage u αβ After the second-order generalized integral, two sets of orthogonal signals v are generated. αβ and qv αβ ; 3) via u αβ v αβ and qv αβ Perform cross-product frequency discrimination to estimate the frequency deviation ε f ; 4) Use a loop filter to reduce the frequency deviation ε f Perform zero-static-error tracking to obtain the angular acceleration β; 5) Based on the angular acceleration, the angular velocity ω is obtained using a voltage-controlled oscillator. The angular velocity ω is also applied to the second-order generalized integral in 2) to generate an orthogonal signal. 6) The grid connection point frequency f and the rate of change of the grid connection point frequency can be obtained from the angular velocity ω and angular acceleration β.

5. The centralized coordinated control method for new energy power stations according to claim 1, characterized in that, In (22), the determination of whether to enable the inertial response state based on the frequency change rate after variable parameter filtering is as follows: If the following conditions are met: If so, the inertial response state will switch; otherwise, it will not switch. Δf represents the frequency change rate after variable parameter filtering, and Δf represents the frequency deviation.

6. A centralized coordination and control device for new energy power stations, characterized in that, It includes a photovoltaic energy storage coordination controller, a photovoltaic coordination controller, and an energy storage coordination controller. The photovoltaic energy storage coordination controller is located at the upper level of the control and controls the subordinate photovoltaic coordination controller and energy storage coordination controller. The photovoltaic coordination controller and energy storage coordination controller respectively control the subordinate photovoltaic converter unit and energy storage converter unit. The photovoltaic energy storage coordination controller includes: an information acquisition unit, a first upper-level command communication unit, a control unit, a first lower-level command communication unit, and a first status information display unit; The information acquisition unit is used to collect the grid connection point voltage of the new energy power station, and calculate the grid connection point frequency, voltage amplitude and grid connection point frequency change rate based on the grid connection point voltage; The first upper-layer instruction communication unit is used to receive external control instructions, including active power, reactive power, current instruction values, and start / stop and enable function mode instructions. The control unit is used to generate control commands for the subordinate photovoltaic coordinating controller and energy storage coordinating controller according to external control commands; The first lower-level command communication unit is used to obtain the operating status of the subordinate photovoltaic coordinating controller and energy storage coordinating controller, obtain the active power and reactive power of each photovoltaic converter unit under the photovoltaic coordinating controller, obtain the active power, reactive power and SOC value of each energy storage converter unit under the energy storage coordinating controller, and send the command generated by the control unit to the subordinate photovoltaic coordinating controller and energy storage coordinating controller. The first status information display unit is used to display the operating status of the photovoltaic energy storage coordination controller; The photovoltaic coordination controller includes: a second upper-level command communication unit, a second functional control unit, a second lower-level command communication unit, and a second status information display unit; the energy storage coordination controller includes: a third upper-level command communication unit, a third functional control unit, a third lower-level command communication unit, and a third status information display unit. The second upper-layer command communication unit is used to communicate with the photovoltaic energy storage coordination controller to obtain control commands, including active power, reactive power, current command values, and start / stop and enable function mode commands. The second functional control unit is used to implement the low voltage ride-through centralized control method in the centralized coordinated control method for new energy power stations as described in any one of claims 1-5; The second lower-level command communication unit is used to obtain the operating status of the subordinate photovoltaic converter units and to obtain the active power and reactive power of each photovoltaic converter unit; The second status information display unit is used to display the operating status of the photovoltaic coordination controller; The third upper-layer command communication unit is used to communicate with the photovoltaic energy storage coordination controller to obtain control commands, including active power, reactive power, current command values, and start / stop and enable function mode commands. The third functional control unit is used to implement the inertia response centralized control method in the centralized coordinated control method for new energy power stations as described in any one of claims 1-5; The third lower-level command communication unit is used to obtain the operating status of the subordinate energy storage converter units and to obtain the active power, reactive power, and SOC value of each energy storage converter unit. The third status information display unit is used to display the operating status of the energy storage coordination controller.

7. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the centralized coordinated control method for new energy power stations as described in any one of claims 1 to 5.

8. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the centralized coordinated control method for new energy power stations as described in any one of claims 1 to 5.

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