AGC-AVC combined control method, device, equipment and medium for energy storage type wind power plant

Abstract

The invention relates to an energy storage type wind power plant AGC-AVC combined control method, device and equipment and a medium. The energy storage type wind power plant AGC-AVC combined control method comprises the following steps: acquiring a voltage signal of a wind power plant grid connection point based on an energy storage type wind power plant AGC-AVC combined control model, and analyzing frequency information and amplitude information from the voltage signal; generating an active power adjusting instruction according to a first difference value between the frequency information and the reference frequency; generating a reactive power regulation instruction according to a second difference value between the amplitude information and the reference amplitude; and respectively issuing the active power regulation instruction and the reactive power regulation instruction to each wind driven generator in the wind power plant so as to realize the cooperative control of the frequency and the voltage of the grid-connected point. According to the embodiment of the invention, the method can achieve the high-precision simulation of the voltage and frequency characteristics of the grid-connected point of the wind power plant, provides a reliable digital twinning environment for the verification of a control strategy, and is of great significance for the improvement of the renewable energy consumption capability and operation stability of a power system.

Description

Technical Field

[0001] This disclosure relates to the field of power system technology, and in particular to a method, device, equipment and medium for AGC-AVC joint control of energy storage wind farms. Background Technology

[0002] As wind power accounts for an increasingly larger share of the energy mix, its randomness, volatility, and intermittency pose challenges to the stable operation of the power grid. Large-scale wind power integration into the grid can cause power fluctuations that lead to shifts in grid frequency and voltage, affecting power quality. Automatic Generation Control (AGC) and Automatic Voltage Control (AVC) are core mechanisms for ensuring the stable operation of the power system.

[0003] In existing technologies, the research and verification of control strategies for wind farms typically rely on digital simulation. However, traditional wind farm models often fail to adequately consider the synergistic effects of energy storage systems or provide insufficient simulation of the dynamic interaction between the farm-level AGC / AVC and the controller. Furthermore, detailed models containing numerous wind turbines and converters result in enormous computational demands and low efficiency in simulations. Summary of the Invention

[0004] To address the aforementioned technical issues, this disclosure provides a method, apparatus, equipment, and medium for AGC-AVC joint control of energy storage wind farms.

[0005] Firstly, this disclosure provides a method for joint AGC-AVC control of energy storage wind farms, including: The voltage signal at the grid connection point of the wind farm is obtained based on the AGC-AVC joint control model of the energy storage wind farm, and the frequency information and amplitude information are extracted from the voltage signal. Based on the first difference between the frequency information and the reference frequency, an active power adjustment command is generated; Based on the second difference between the amplitude information and the reference amplitude, a reactive power adjustment command is generated. The active power regulation command and the reactive power regulation command are respectively sent to each wind turbine in the wind farm to achieve coordinated control of the frequency and voltage at the grid connection point.

[0006] Secondly, this disclosure provides an AGC-AVC joint control device for an energy storage wind farm, comprising: The first processing module is used to obtain the voltage signal of the wind farm grid connection point based on the AGC-AVC joint control model of the energy storage wind farm, and to parse the frequency information and amplitude information from the voltage signal; The first generation module is used to generate an active power adjustment command based on the first difference between the frequency information and the reference frequency. The second generation module is used to generate a reactive power adjustment command based on the second difference between the amplitude information and the reference amplitude. The second processing module is used to send the active power adjustment command and reactive power adjustment command to each wind turbine in the wind farm, so as to realize the coordinated control of the frequency and voltage at the grid connection point.

[0007] Thirdly, this disclosure provides an energy storage-type wind farm AGC-AVC joint control device, including: processor; Memory, used to store executable instructions; The processor is used to read executable instructions from memory and execute the executable instructions to implement the first aspect of the energy storage wind farm AGC-AVC joint control method.

[0008] Fourthly, this disclosure provides a computer-readable storage medium storing a computer program that, when executed by a processor, causes the processor to implement the energy storage-type wind farm AGC-AVC joint control method of the first aspect.

[0009] The technical solution provided in this disclosure has the following advantages compared with the prior art: The AGC-AVC joint control method, apparatus, equipment, and medium for energy storage wind farms disclosed in this invention can acquire the voltage signal at the grid connection point of the wind farm based on the AGC-AVC joint control model of the energy storage wind farm, and parse frequency and amplitude information from the voltage signal. Then, based on a first difference between the frequency information and a reference frequency, an active power regulation command is generated, and based on a second difference between the amplitude information and a reference amplitude, a reactive power regulation command is generated. Finally, the active power regulation command and reactive power regulation command are respectively sent to each wind turbine in the wind farm to achieve coordinated control of the frequency and voltage at the grid connection point. Therefore, by constructing a refined AGC-AVC joint control model for energy storage wind farms, high-precision simulation of the voltage and frequency characteristics of the wind farm's grid connection point is achieved, providing a reliable digital twin environment for control strategy verification. This is of great significance for improving the power system's ability to absorb renewable energy and its operational stability. Attached Figure Description

[0010] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale.

[0011] Figure 1 A flowchart illustrating an AGC-AVC joint control method for an energy storage wind farm provided in this embodiment of the present disclosure; Figure 2 This is a schematic diagram of the structure of an AGC-AVC joint control model for an energy storage wind farm provided in an embodiment of this disclosure; Figure 3 This is a schematic diagram of the structure of a wind turbine generator provided in an embodiment of the present disclosure; Figure 4 A schematic diagram of another energy storage wind farm AGC-AVC joint control model provided in this embodiment of the present disclosure; Figure 5 This is a schematic diagram of the structure of a grid-side converter provided in an embodiment of the present disclosure; Figure 6 A schematic diagram of the structure of a machine-side converter provided in an embodiment of this disclosure; Figure 7 This is a schematic diagram of another wind turbine provided in an embodiment of the present disclosure; Figure 8 A schematic diagram of the structure of a simulation model of a single lithium battery energy storage system provided in this embodiment of the present disclosure; Figure 9 This is a schematic diagram of the structure of a simulation model of a single lithium battery energy storage grid-connected converter module provided in an embodiment of the present disclosure; Figure 10 This is a schematic diagram of the structure of a static var compensator module provided in an embodiment of the present disclosure; Figure 11 A simulation diagram provided for an embodiment of this disclosure; Figure 12 Another simulation diagram provided for an embodiment of this disclosure; Figure 13 Another simulation diagram provided for embodiments of this disclosure; Figure 14 Another simulation diagram provided for an embodiment of this disclosure; Figure 15 Another simulation diagram provided for an embodiment of this disclosure; Figure 16 This is a schematic diagram of the structure of an energy storage wind farm AGC-AVC joint control device provided in an embodiment of the present disclosure; Figure 17 This is a schematic diagram of the structure of an energy storage wind farm AGC-AVC joint control device provided in an embodiment of this disclosure. Detailed Implementation

[0012] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0013] It should be understood that the various steps described in the method implementation of this disclosure may be performed in different orders and / or in parallel. Furthermore, the method implementation may include additional steps and / or omit the steps shown. The scope of this disclosure is not limited in this respect.

[0014] The term "comprising" and its variations as used herein are open-ended inclusions, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Definitions of other terms will be given in the description below.

[0015] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0016] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0017] The names of messages or information exchanged between multiple devices in this disclosure are for illustrative purposes only and are not intended to limit the scope of such messages or information.

[0018] To address the aforementioned problems, this disclosure provides an AGC-AVC joint control method, apparatus, equipment, and medium for energy storage wind farms. The following is a detailed description... Figure 1-15 The AGC-AVC joint control method for energy storage wind farms provided in this disclosure is described in detail.

[0019] Figure 1 A flowchart illustrating an AGC-AVC joint control method for an energy storage wind farm provided in an embodiment of this disclosure is shown.

[0020] In this embodiment of the disclosure, the AGC-AVC joint control method for the energy storage wind farm can be executed by electronic devices. These electronic devices may include, but are not limited to, devices such as computer equipment, cloud servers, or cloud server clusters.

[0021] like Figure 1 As shown, the AGC-AVC joint control method for energy storage wind farms may include the following steps.

[0022] S110. Obtain the voltage signal at the grid connection point of the wind farm based on the AGC-AVC joint control model of the energy storage wind farm, and parse the frequency information and amplitude information from the voltage signal.

[0023] In this embodiment of the disclosure, the electronic device can obtain the voltage signal of the wind farm grid connection point based on the energy storage wind farm AGC-AVC joint control model, and parse the frequency information and amplitude information from the voltage signal.

[0024] Optionally, the AGC-AVC joint control model for energy storage wind farms can be a model that has been simulated in advance based on real energy storage wind farms.

[0025] Figure 2 A schematic diagram of the structure of an AGC-AVC joint control model for an energy storage wind farm provided in an embodiment of this disclosure is shown.

[0026] like Figure 2As shown, electronic devices can construct an AGC-AVC joint control model for an energy storage wind farm. For example, based on the rich module library and powerful simulation capabilities of MATLAB / Simulink simulation software, appropriate modules and components can be selected to build models of wind turbines, generators, power grids, and control systems. Connecting these modules forms a complete simulation model of the energy storage wind farm. For instance, the AGC-AVC joint control model for an energy storage wind farm is equipped with 20 direct-drive wind turbines and an energy storage system. The generated energy from the wind farm is collected by the wind turbines through a 35kV collection network to the substation. The voltage can be stepped up to 110kV or 220kV by a step-up transformer. An energy storage system is installed on the 35kV side to help regulate the inherent power fluctuations in wind power generation and improve the output of the wind power system. This energy storage-type wind farm AGC-AVC joint control model includes multiple wind turbines, an energy storage system (lithium battery energy storage system), a power collection network (35kV), a step-up transformer, and a control system (AGC and AVC joint control system). The wind turbines are permanent magnet direct-drive synchronous wind turbines. The energy storage-type wind farm AGC-AVC joint control model includes grid-side converters, turbine-side converters, and permanent magnet synchronous generator units. The grid-side converters and turbine-side converters employ a target decoupling control algorithm (dq). The electricity generated by the wind farm is collected by the power collection network and then stepped up to 110kV or 220kV by the step-up transformer before being connected to the grid. The energy storage system is connected to the 35kV bus to smooth out wind power fluctuations.

[0027] For example, at the start of the simulation, the wind speed is set to the rated wind speed of 12 m / s, the initial grid frequency is 50 Hz, and the per-unit voltage value is 1.0 pu. When the simulation reaches the 10th second, a grid frequency disturbance is artificially introduced, reducing the frequency to 49.98 Hz. The control system collects the grid connection point voltage signal in real time, and uses a phase-locked loop (PLL) to resolve the frequency information as 49.98 Hz and the resolved voltage amplitude as 1.0 pu.

[0028] S120. Generate an active power adjustment command based on the first difference between the frequency information and the reference frequency.

[0029] In this embodiment of the disclosure, the electronic device can generate an active power adjustment command based on a first difference between the frequency information and the reference frequency.

[0030] Specifically, the electronic equipment can collect the grid connection point voltage signal in real time, and the frequency information is analyzed by AGC to be 49.98Hz. The first difference is obtained by comparing it with the reference frequency of 50Hz and the result is -0.02Hz. Based on this information, the system generates a corresponding active power adjustment command, requiring the wind farm to increase active power output to raise the frequency.

[0031] S130. Generate a reactive power adjustment command based on the second difference between the amplitude information and the reference amplitude.

[0032] In this embodiment of the disclosure, the electronic device can generate a reactive power adjustment command based on a second difference between the amplitude information and the reference amplitude.

[0033] Specifically, the electronic equipment can collect the grid connection point voltage signal in real time, and the voltage amplitude obtained by AVC is 1.0 pu. The second difference value is obtained by comparing it with the reference amplitude, and the reactive power adjustment command is zero.

[0034] S140. The active power adjustment command and the reactive power adjustment command are respectively sent to each wind turbine in the wind farm to achieve coordinated control of the frequency and voltage at the grid connection point.

[0035] In this embodiment of the disclosure, the electronic device can send the active power adjustment command and the reactive power adjustment command to each wind turbine in the wind farm to achieve coordinated control of the frequency and voltage at the grid connection point.

[0036] Specifically, after receiving active power regulation commands and reactive power regulation commands, the electronic equipment can send them to each wind turbine in the wind farm. These commands are then sent to the controllers of each wind turbine via a communication network, ultimately restoring the grid frequency to the normal range of 50Hz, thereby achieving coordinated control of the grid connection point frequency and voltage.

[0037] Therefore, in this embodiment, the voltage signal at the grid connection point of the wind farm can be obtained based on the AGC-AVC joint control model of the energy storage wind farm. Frequency and amplitude information are then extracted from the voltage signal. Next, an active power regulation command is generated based on a first difference between the frequency information and a reference frequency, and a reactive power regulation command is generated based on a second difference between the amplitude information and a reference amplitude. Finally, the active and reactive power regulation commands are respectively sent to each wind turbine in the wind farm to achieve coordinated control of the grid connection point frequency and voltage. Thus, by constructing a refined AGC-AVC joint control model for the energy storage wind farm, high-precision simulation of the voltage and frequency characteristics of the wind farm grid connection point is achieved, providing a reliable digital twin environment for control strategy verification. This is of great significance for improving the power system's ability to absorb renewable energy and its operational stability.

[0038] Optionally, S120 may specifically include: determining whether the first difference between the frequency information and the reference frequency exceeds a preset frequency dead zone; if it exceeds, processing the first difference through a control algorithm, generating an active power reference value adjustment amount through integration, and generating an active power adjustment command based on the active power reference value adjustment amount, wherein the active power adjustment command is used to superimpose the active power reference value adjustment amount onto the original active power reference setpoint of the wind turbine.

[0039] In this embodiment of the disclosure, the electronic device can determine whether the first difference between the frequency information and the reference frequency exceeds a preset frequency dead zone. If it does, the first difference is processed by a control algorithm, and then an active power reference value adjustment amount is generated through integral calculation. Based on the active power reference value adjustment amount, the active power adjustment command is generated.

[0040] The active power adjustment command is used to superimpose the adjustment amount of the active power reference value onto the original active power reference setting value of the wind turbine.

[0041] Specifically, the input to the AGC control module is the grid connection voltage of the wind farm. The frequency of this voltage is obtained through a frequency calculation unit and subtracted from the fundamental frequency of 50Hz to obtain the frequency fluctuation of the grid connection voltage. This frequency fluctuation is then fed into the AGC control loop, which has a dead zone of ±0.002Hz. If the frequency fluctuation exceeds ±0.002Hz, the AGC control loop will activate to adjust the frequency fluctuation. The AGC output, after passing through an integrator, is sent to the active power reference value adjustment section of each wind turbine. The frequency fluctuation is regulated by dynamically adjusting the output active power.

[0042] Optionally, S130 may specifically include: determining whether the second difference between the amplitude information and the reference amplitude exceeds a preset amplitude dead zone; if it exceeds, processing the second difference through a control algorithm to generate a reactive power reference value adjustment amount, and generating the reactive power adjustment command based on the reactive power reference value adjustment amount, wherein the reactive power adjustment command is used to set the reactive power output target of the wind turbine through the reactive power reference value adjustment amount.

[0043] The reactive power adjustment command is used to set the reactive power output target of the wind turbine unit by adjusting the reactive power reference value.

[0044] Specifically, the input to the AVC controller is also the grid-connected voltage of the wind farm. After passing through the amplitude calculation unit, the amplitude of the grid-connected voltage is obtained. The amplitude fluctuation of the wind farm's grid-connected voltage is obtained by subtracting it from the per-unit amplitude value of 1 pu. The amplitude fluctuation is sent to the AVC control loop, which has a control dead zone set to ±0.001 pu. If the amplitude fluctuation is greater than ±0.001 pu, the AVC control loop will activate control to adjust the amplitude fluctuation. The output value of the AVC controller is sent to the reactive power reference value adjustment section of each wind turbine, thereby realizing the dynamic adjustment of the reactive power output of the wind turbine.

[0045] In summary, since the inputs of both the AGC and AVC control loops use the same grid connection point voltage signal, the AGC and AVC are jointly controlled. Their outputs are used to adjust the active and reactive power of each unit, thereby achieving dynamic control of the voltage amplitude and frequency characteristics of the entire wind farm.

[0046] Optionally, the energy storage wind farm AGC-AVC joint control method may further include: determining the reactive power characteristics of the wind farm's grid connection point through a static var compensator, and generating a reverse compensation current to dynamically offset the reactive component.

[0047] In this embodiment of the disclosure, the electronic device can determine the reactive power characteristics of the wind farm grid connection point through a static var compensator and generate a reverse compensation current to dynamically offset the reactive power component.

[0048] For example, in the simulation model, a ±5Mvar STATCOM device is configured and connected to the 35kV bus of the wind farm. When the reactive power of the wind farm fluctuates due to sudden changes in wind speed, the STATCOM generates a corresponding reverse compensation current within 10ms by real-time detection of the reactive power characteristics at the grid connection point. When it detects that the wind farm suddenly absorbs 3Mvar of reactive power, the STATCOM immediately generates +3Mvar of reactive power output, effectively offsetting the reactive power deficit of the system and maintaining the voltage stability at the grid connection point.

[0049] Optionally, the energy storage wind farm AGC-AVC joint control method may further include: controlling the grid-side converter to stabilize the DC bus voltage and regulate reactive power; and controlling the turbine-side converter to track the optimal power point of the wind turbine and control the generator torque.

[0050] In this embodiment of the disclosure, the electronic device can control the grid-side converter to stabilize the DC bus voltage and regulate reactive power, and control the turbine-side converter to track the optimal power point of the wind turbine and control the generator torque.

[0051] For example, in the simulation, the grid-side converter control system adopts a dual-closed-loop structure: the outer loop is a DC voltage control loop, and the inner loop is a current tracking loop. When the DC bus voltage setpoint is 1150V, the outer loop PI controller maintains the voltage stability by adjusting the active current reference value. Simultaneously, it receives reactive power commands from the AVC system and achieves reactive power control by adjusting the reactive current reference value. The generator-side converter also adopts dual-closed-loop control: the outer loop is a speed / power control loop, which generates the optimal power curve using the MPPT algorithm, calculates the optimal tip speed ratio based on real-time wind speed, and then obtains the optimal speed reference value; the inner loop is a current control loop, which adjusts the generator torque to ensure the wind turbine operates at the optimal power point. For example, at a wind speed of 10m / s, the control system maintains the wind turbine speed at 15rpm, corresponding to an output power of 1.8MW, maximizing the utilization of wind energy.

[0052] Optionally, after S140, the AGC-AVC joint control method for the energy storage wind farm may further include: acquiring simulation data; and performing analysis and optimization processing based on the simulation data.

[0053] In this embodiment of the disclosure, the electronic device can acquire simulation data and perform analysis and optimization processing based on the simulation data.

[0054] Specifically, the wind turbine model is connected to the wind farm layout model. Based on the wind farm layout, the electrical connections between the individual wind turbines are determined. Cable models or overhead line models can be used to describe these electrical connections, connecting the wind turbine control system to the electrical system. The control system controls the wind turbine's operation based on signals such as wind speed and power output, such as adjusting blade angles and controlling generator speed. The control system's output signals are transmitted to the wind turbine through the electrical system, enabling control of the wind turbine. The wind farm's power collection system is then connected to the power grid model. The power collection system transmits the wind farm's electricity to the grid, requiring consideration of grid parameters such as voltage and frequency, as well as grid stability and reliability requirements. Transformer models and equivalent grid models can be used to connect the wind farm and the grid. Finally, simulation parameters for the wind farm are set, including meteorological conditions such as wind speed, wind direction, temperature, and air pressure, as well as wind turbine parameters and grid parameters. The simulation is then run to observe the wind farm's operating status and performance indicators. Simulation results can be used to analyze the performance of wind farms in terms of power output, voltage stability, and frequency stability, and to optimize the design and control strategies of wind farms.

[0055] Figure 3 A schematic diagram of the structure of a wind turbine generator provided in an embodiment of this disclosure is shown.

[0056] like Figure 3The image shows a packaged model of 10 permanent magnet direct-drive synchronous wind turbines. The wind speed reference value is based on the actual monitoring results of a wind farm. The wind speed is preset by writing the wind speed data into the Reapaeting table module.

[0057] Figure 4 A schematic diagram of another energy storage wind farm AGC-AVC joint control model provided in this embodiment is shown.

[0058] like Figure 4 As shown, the AGC-AVC joint control model for an energy storage wind farm includes a grid-side converter, a machine-side converter, and a permanent magnet synchronous generator (PMSG) unit. The grid-side and machine-side converters are encapsulated as a whole, and control parameters such as the power control loop, current loop, pitch angle, and maximum current can be set externally. The AGC-AVC joint control model also includes a wind turbine control system, whose inputs are wind speed, synchronous generator angular velocity, and pitch angle. The outputs are reference values ​​for the wind turbine's electromagnetic torque Tm and active power. In this control system, the adjustment of the active power reference value input by the AGC is superimposed on the MPPT control loop output value, achieving dynamic adjustment of the wind turbine's output active power.

[0059] Figure 5 A schematic diagram of the structure of a grid-side converter provided in an embodiment of this disclosure is shown.

[0060] like Figure 5 As shown, the grid-side converter control system employs a dq decoupling control algorithm. The voltage loop adjusts the DC voltage amplitude by monitoring it, outputting an active current reference value (Idref). The reactive power control loop monitors the difference between the actual reactive power of the wind turbine and the reference reactive power, outputting a reactive current reference value (Iqref). The subsequent current loop adjusts the active and reactive current reference values ​​against the actual values ​​to generate a modulation voltage reference value, which is then compared using PWM, thereby achieving tracking control of the grid-side converter.

[0061] Figure 6 A schematic diagram of the structure of a machine-side converter provided in an embodiment of this disclosure is shown.

[0062] like Figure 6 As shown, in the control system module of the generator-side converter, the active power output by the wind turbine is first detected and regulated, and the reference values ​​of active and reactive current on the generator side are output. After current loop control with the actual active and reactive current, PWM is performed to realize the tracking control of the reference current and the actual current of the generator-side converter.

[0063] Figure 7 A schematic diagram of another wind turbine provided in an embodiment of this disclosure is shown.

[0064] like Figure 7 The diagram shows the equivalent amplification module for a wind turbine. Since a single wind turbine contains numerous converters and control units, simulating them all using detailed models would result in excessively slow calculations or even system crashes. Therefore, an equivalent method is used. This involves collecting the output current of a single wind turbine and multiplying it by an amplification factor. For example, to simulate nine turbines, the output current of each individual turbine is multiplied by nine, and the summations achieve an equivalent amplification of the wind turbine's output power.

[0065] Figure 8 A schematic diagram of the structure of a simulation model of a single lithium battery energy storage system provided in an embodiment of this disclosure is shown.

[0066] like Figure 8 The diagram shown is a simulation model of a single lithium battery energy storage system. It includes the lithium battery unit, the grid-connected inverter unit, and the isolation transformer unit. The lithium battery outputs a DC voltage of 300V, which is converted to 380V AC voltage by the grid-connected inverter module, and then stepped up to 35kV by two stages of isolation transformers before being connected to the grid.

[0067] Figure 9 A schematic diagram of the structure of a simulation model of a single lithium battery energy storage grid-connected converter module provided in an embodiment of this disclosure is shown.

[0068] like Figure 9 The diagram shown is a simulation model of a single lithium-ion battery energy storage grid-connected converter module. The lithium-ion battery energy storage system employs a dq control strategy, controlling its output characteristics by acquiring the three-phase voltage and current at the grid connection point and providing a power reference value. The charging and discharging process is simulated by setting the positive and negative signs of the power reference value. The capacity of the lithium-ion battery energy storage system can be determined by... Figure 7 The method described in the text is used to perform equivalent scaling, thereby realizing the simulation modeling of lithium battery energy storage systems.

[0069] Figure 10 A schematic diagram of the structure of a static var compensator module provided in an embodiment of this disclosure is shown.

[0070] like Figure 10 As shown, this module detects the reactive power characteristics of the grid connection point and generates a reverse current to cancel the reactive component, thereby realizing dynamic adjustment of the reactive power output of the wind farm.

[0071] Figure 11 A simulation diagram provided by an embodiment of this disclosure is shown.

[0072] like Figure 11 The figure shows a simulation diagram of the actual frequency and reference frequency in AGC control. The frequency control of AGC can be adjusted as needed.

[0073] Figure 12 Another simulation diagram provided by an embodiment of this disclosure is shown.

[0074] like Figure 12 The figure shows a simulation diagram of the actual voltage and reference voltage at the PCC point in AVC control. It can be seen that AVC control can effectively control the system as needed. The figure also shows that the output voltage at the PCC common coupling point can quickly respond to changes in the reference value.

[0075] Figure 13 This illustration shows yet another simulation diagram provided by an embodiment of the present disclosure.

[0076] like Figure 13 As shown, (a) is the simulation result of the reference value and actual value of the active current of a single wind turbine, and (b) is the simulation result of the output active power, reactive power and wind speed of a single wind turbine. It can be seen that a single wind turbine can track the command well and output ideal active current, active power and reactive power.

[0077] Figure 14 Another simulation diagram provided by an embodiment of this disclosure is shown.

[0078] like Figure 14 As shown, the simulation results and enlarged view of the voltage and current at the PCC grid connection point are presented. It can be seen that the control strategy of this system is reasonably designed, the AGC-AVC collaborative control scheme is effectively utilized, and the output grid connection point voltage and current are good.

[0079] Figure 15 Another simulation diagram provided by an embodiment of this disclosure is shown.

[0080] like Figure 15 The figure shows the simulation diagram and enlarged view of the PCC voltage and current of a single energy storage converter. It can be seen that the control strategy of this system is reasonably designed, the AGC-AVC collaborative control scheme is effectively utilized, and it can output a better grid connection point voltage and current.

[0081] Figure 16 A schematic diagram of the structure of an energy storage wind farm AGC-AVC joint control device provided in an embodiment of this disclosure is shown.

[0082] like Figure 16 As shown, the energy storage wind farm AGC-AVC joint control device 1600 may include a first processing module 1610, a first generation module 1620, a second generation module 1630, and a second processing module 1640.

[0083] The first processing module 1610 can be used to obtain the voltage signal of the wind farm grid connection point based on the AGC-AVC joint control model of the energy storage wind farm, and to parse the frequency information and amplitude information from the voltage signal.

[0084] The first generation module 1620 can generate an active power adjustment command based on the first difference between the frequency information and the reference frequency.

[0085] The second generation module 1630 can be used to generate a reactive power adjustment command based on the second difference between the amplitude information and the reference amplitude.

[0086] The second processing module 1640 can be used to send the active power adjustment command and reactive power adjustment command to each wind turbine in the wind farm, so as to realize the coordinated control of the frequency and voltage at the grid connection point.

[0087] Therefore, in this embodiment, the voltage signal at the grid connection point of the wind farm can be obtained based on the AGC-AVC joint control model of the energy storage wind farm. Frequency and amplitude information are then extracted from the voltage signal. Next, an active power regulation command is generated based on a first difference between the frequency information and a reference frequency, and a reactive power regulation command is generated based on a second difference between the amplitude information and a reference amplitude. Finally, the active and reactive power regulation commands are respectively sent to each wind turbine in the wind farm to achieve coordinated control of the grid connection point frequency and voltage. Thus, by constructing a refined AGC-AVC joint control model for the energy storage wind farm, high-precision simulation of the voltage and frequency characteristics of the wind farm grid connection point is achieved, providing a reliable digital twin environment for control strategy verification. This is of great significance for improving the power system's ability to absorb renewable energy and its operational stability.

[0088] In some embodiments of this disclosure, the first generation module 1620 includes: The first judgment unit is used to determine whether the first difference between the frequency information and the reference frequency exceeds the preset frequency dead zone.

[0089] The first generation unit is used to, if the value exceeds the limit, process the first difference through a control algorithm, generate an active power reference value adjustment amount through integral calculation, and generate the active power adjustment command based on the active power reference value adjustment amount. The active power adjustment command is used to superimpose the active power reference value adjustment amount onto the original active power reference setpoint of the wind turbine.

[0090] In some embodiments of this disclosure, the second generation module 1630 includes: The first judgment unit is used to determine whether the second difference between the amplitude information and the reference amplitude exceeds the preset amplitude dead zone.

[0091] The first generation unit is used to process the second difference through a control algorithm to generate a reactive power reference value adjustment amount if the value is exceeded, and to generate the reactive power adjustment instruction based on the reactive power reference value adjustment amount. The reactive power adjustment instruction is used to set the reactive power output target of the wind turbine through the reactive power reference value adjustment amount.

[0092] In some embodiments of this disclosure, the energy storage wind farm AGC-AVC joint control device 1600 further includes: The third processing module is used to determine the reactive power characteristics of the wind farm's grid connection point through a static var compensator and generate a reverse compensation current to dynamically offset the reactive power component.

[0093] In some embodiments of this disclosure, the energy storage wind farm AGC-AVC joint control model includes multiple wind turbines, an energy storage system, a power collection network, a step-up transformer, and a control system. The wind turbines are permanent magnet direct-drive synchronous wind turbines. The energy storage wind farm AGC-AVC joint control model includes grid-side converters, turbine-side converters, and permanent magnet synchronous generator units, wherein the grid-side converters and turbine-side converters adopt a target decoupling control algorithm.

[0094] In some embodiments of this disclosure, the energy storage wind farm AGC-AVC joint control device 1600 further includes: The first control module is used to control the grid-side converter to stabilize the DC bus voltage and regulate reactive power.

[0095] The second control module is used to control the turbine-side converter to track the optimal power point of the wind turbine and control the generator torque.

[0096] In some embodiments of this disclosure, the energy storage wind farm AGC-AVC joint control device 1600 further includes: The data acquisition module is used to acquire simulation data.

[0097] The fourth processing module is used to perform analysis and optimization processing based on the simulation data.

[0098] It should be noted that, Figure 16 The energy storage wind farm AGC-AVC combined control device 1600 shown can perform... Figure 1-15 The various steps in the method embodiment shown are implemented. Figure 1-15 The processes and effects in the method embodiments shown are not described in detail here.

[0099] Figure 17 A schematic diagram of the structure of an energy storage wind farm AGC-AVC joint control device provided in an embodiment of this disclosure is shown.

[0100] In some embodiments of this disclosure, Figure 17 The AGC-AVC joint control equipment shown for the energy storage wind farm can be an electronic device. Specifically, the electronic device can include, but is not limited to, devices such as computer equipment, cloud servers, or cloud server clusters.

[0101] like Figure 17 As shown, the energy storage wind farm AGC-AVC joint control device may include a processor 1701 and a memory 1702 storing computer program instructions.

[0102] Specifically, the processor 1701 may include a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits that can be configured to implement the embodiments of this application.

[0103] Memory 1702 may include mass storage for information or instructions. For example, and not limitingly, memory 1702 may include a hard disk drive (HDD), floppy disk drive, flash memory, optical disk, magneto-optical disk, magnetic tape, or Universal Serial Bus (USB) drive, or a combination of two or more of these. Where appropriate, memory 1702 may include removable or non-removable (or fixed) media. Where appropriate, memory 1702 may be internal or external to the integrated gateway device. In a particular embodiment, memory 1702 is non-volatile solid-state memory. In a particular embodiment, memory 1702 includes read-only memory (ROM). Where appropriate, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable programmable PROM (EEPROM), an electrically alterable ROM (EAROM), or flash memory, or a combination of two or more of these.

[0104] The processor 1701 reads and executes computer program instructions stored in the memory 1702 to perform the steps of the AGC-AVC joint control method for energy storage wind farms provided in this embodiment of the present disclosure.

[0105] In one example, the energy storage wind farm AGC-AVC joint control device may also include a transceiver 1703 and a bus 1704. For example... Figure 17 As shown, the processor 1701, memory 1702 and transceiver 1703 are connected via bus 1704 and communicate with each other.

[0106] Bus 1704 includes hardware, software, or both. For example, and not limitingly, the bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Extended Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a Hyper Transport (HT) interconnect, an Industrial Standard Architecture (ISA) bus, an Infinite Bandwidth Interconnect, a Low Pin Count (LPC) bus, a memory bus, a MicroChannel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local Bus (VLB) bus, or other suitable buses, or a combination of two or more of these. Where appropriate, bus 1704 may include one or more buses. Although specific buses are described and illustrated in the embodiments of this application, this application considers any suitable bus or interconnection.

[0107] This disclosure also provides a computer-readable storage medium that can store a computer program. When the computer program is executed by a processor, the processor enables the processor to implement the energy storage wind farm AGC-AVC joint control method provided in this disclosure.

[0108] The aforementioned storage medium may, for example, include a memory 1702 containing computer program instructions, which can be executed by the processor 1701 of the energy storage wind farm AGC-AVC joint control device to complete the energy storage wind farm AGC-AVC joint control method provided in this embodiment. Optionally, the storage medium may be a non-transitory computer-readable storage medium, such as a ROM, random access memory (RAM), compact disc ROM (CD-ROM), magnetic tape, floppy disk, and optical data storage device.

[0109] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the term "comprising" is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0110] The above description is merely a specific embodiment of this disclosure, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for joint AGC-AVC control of an energy storage wind farm, characterized in that, include: The voltage signal at the grid connection point of the wind farm is obtained based on the AGC-AVC joint control model of the energy storage wind farm, and the frequency information and amplitude information are extracted from the voltage signal. Based on the first difference between the frequency information and the reference frequency, an active power adjustment command is generated; Based on the second difference between the amplitude information and the reference amplitude, a reactive power adjustment command is generated. The active power regulation command and the reactive power regulation command are respectively sent to each wind turbine in the wind farm to achieve coordinated control of the frequency and voltage at the grid connection point.

2. The method according to claim 1, characterized in that, The step of generating an active power adjustment command based on the first difference between the frequency information and the reference frequency includes: Determine whether the first difference between the frequency information and the reference frequency exceeds a preset frequency dead zone; If the value exceeds the limit, the first difference is processed by the control algorithm, and then an active power reference value adjustment is generated through integral calculation. Based on the active power reference value adjustment, the active power adjustment command is generated. The active power adjustment command is used to superimpose the active power reference value adjustment onto the original active power reference setpoint of the wind turbine.

3. The method according to claim 1, characterized in that, The step of generating a reactive power adjustment command based on the second difference between the amplitude information and the reference amplitude includes: Determine whether the second difference between the amplitude information and the reference amplitude exceeds the preset amplitude dead zone; If the value exceeds the limit, the second difference is processed by the control algorithm to generate a reactive power reference value adjustment amount, and a reactive power adjustment command is generated based on the reactive power reference value adjustment amount. The reactive power adjustment command is used to set the reactive power output target of the wind turbine through the reactive power reference value adjustment amount.

4. The method according to claim 1, characterized in that, The method further includes: The reactive power characteristics of the wind farm's grid connection point are determined by a static var compensator, and a reverse compensation current is generated to dynamically offset the reactive power component.

5. The method according to claim 1, characterized in that, The energy storage wind farm AGC-AVC joint control model includes multiple wind turbines, energy storage systems, power collection networks, step-up transformers, and control systems. The wind turbines are permanent magnet direct-drive synchronous wind turbines. The energy storage wind farm AGC-AVC joint control model includes grid-side converters, turbine-side converters, and permanent magnet synchronous generator units. The grid-side converters and turbine-side converters adopt a target decoupling control algorithm.

6. The method according to claim 5, characterized in that, The method further includes: Control the grid-side converter to stabilize the DC bus voltage and regulate reactive power; The generator-side converter is controlled to track the wind turbine's optimal power point and control the generator torque.

7. The method according to claim 1, characterized in that, After the active power regulation command and the reactive power regulation command are respectively sent to each wind turbine in the wind farm, the method further includes: Acquire simulation data; The simulation data is then analyzed and optimized.

8. A combined AGC-AVC control device for an energy storage wind farm, characterized in that, include: The first processing module is used to obtain the voltage signal of the wind farm grid connection point based on the AGC-AVC joint control model of the energy storage wind farm, and to parse the frequency information and amplitude information from the voltage signal; The first generation module is used to generate an active power adjustment command based on the first difference between the frequency information and the reference frequency. The second generation module is used to generate a reactive power adjustment command based on the second difference between the amplitude information and the reference amplitude. The second processing module is used to send the active power adjustment command and reactive power adjustment command to each wind turbine in the wind farm, so as to realize the coordinated control of the frequency and voltage at the grid connection point.

9. A combined AGC-AVC control device for an energy storage wind farm, characterized in that, include: processor; Memory, used to store executable instructions; The processor is configured to read the executable instructions from the memory and execute the executable instructions to implement the AGC-AVC joint control method for energy storage wind farms as described in any one of claims 1-7.

10. A non-volatile computer-readable storage medium, characterized in that, The storage medium stores a computer program, which, when executed by a processor, causes the processor to implement the AGC-AVC joint control method for energy storage wind farms as described in any one of claims 1-7.

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