Grid-forming control method and apparatus

Abstract

The present application provides a grid-forming control method and apparatus, applicable to a grid-forming device employing a grid-forming control strategy, the grid-forming device including a new energy power generation apparatus and a power electronic device, and the power electronic device being configured to connect the new energy power generation apparatus to a power grid. The method of the present application comprises: determining an actual power value output by the power electronic device to the power grid; determining a power deviation value on the basis of a difference between the actual power value and a power reference value; processing the power deviation value according to a preset strategy, and obtaining a target signal; on the basis of the target signal, determining a phase angle of a voltage output by the power electronic device to the power grid; and, on the basis of the phase angle, regulating the voltage output by the power electronic device to the power grid. In the present application, a power deadband stage (i.e., implementation of the preset strategy) is introduced into grid-forming control. When the power falls within a deadband, the phase angle output by the grid-forming device remains unchanged, so that the grid-forming device externally exhibits voltage-source characteristics having a constant frequency and a constant phase angle, thereby effectively improving the frequency support capability and stability of the grid-forming device.

Description

A method and apparatus for controlling network construction

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 2025103760832, filed on March 27, 2025, entitled “A Network Control Method and Apparatus”, which is incorporated herein by reference in its entirety. Technical Field

[0003] This application relates to the field of power system control technology, and in particular to a grid control method and apparatus. Background Technology

[0004] With the rapid development of new energy sources connected to the grid via power electronic devices, the characteristics of new power systems—high proportion of new energy sources and high proportion of power electronic devices—are becoming increasingly prominent. Grid-based technology is one of the key technologies supporting the safe and stable operation of new power systems.

[0005] The core of grid-based control is to enable power electronic interface power sources (including wind power, photovoltaics, and energy storage) to exhibit characteristics outside the voltage source, thereby actively providing frequency and voltage support to the grid. The control element that generates the phase angle of the external voltage source is the core of the grid-based control strategy.

[0006] Grid-based control strategies primarily employ feedback control with power as the input. This involves adjusting the frequency and phase angle of the voltage source based on the output power of the power electronic equipment (responsible for integrating the power electronic interface power supply into the grid). Specific control strategies include various approaches, such as active power frequency droop control and virtual synchronous machine control. However, these strategies have limited ability to provide frequency support to the grid and require further improvement. Summary of the Invention

[0007] This application provides a grid control method and apparatus to address the shortcomings of the limited frequency support capability of the existing technology for the power grid. This application adds a power dead zone element (implemented through a preset strategy) to the grid control strategy, introducing an ideal voltage source range with constant frequency and phase angle to the grid equipment, which can effectively improve the frequency support capability and stability of the grid equipment.

[0008] This application provides a grid-connected control method applied to grid-connected equipment employing a grid-connected control strategy. The grid-connected equipment includes a new energy power generation device and power electronic equipment. The power electronic equipment is used to connect the new energy power generation device to the power grid. The grid-connected control method includes:

[0009] Determine the actual power output of the power electronic equipment to the power grid;

[0010] The difference between the actual power value and the power reference value is determined to obtain the power deviation value;

[0011] The power deviation value is processed according to a preset strategy to obtain the target signal;

[0012] The phase angle of the voltage output to the power grid by the power electronic device is determined based on the target signal;

[0013] The voltage output from the power electronic device to the power grid is adjusted according to the phase angle;

[0014] The preset strategy is as follows:

[0015] Where x represents the power deviation value, u represents the target signal, a represents the first threshold, and b represents the second threshold.

[0016] According to a network control method provided in this application, the second threshold is determined as follows:

[0017] Based on the current state of the network-type equipment, determine the maximum active power value that the power electronic equipment can continuously output;

[0018] The difference between the maximum active power value and the power reference value is determined as the second threshold. According to a network control method provided in this application, determining the difference between the actual power value and the power reference value to obtain a power deviation value includes:

[0019] The actual power value is filtered to obtain the filtered power value;

[0020] The power deviation value is obtained by determining the difference between the filtered power value and the power reference value.

[0021] According to a grid control method provided in this application, determining the phase angle of the voltage output to the power grid by the power electronic device based on the target signal includes:

[0022] The target signal is amplified to obtain the first frequency of the voltage;

[0023] The frequency of the voltage is obtained by determining the sum of the first frequency and the reference frequency;

[0024] The phase angle of the voltage is obtained by integrating the frequency of the voltage.

[0025] According to a grid control method provided in this application, determining the phase angle of the voltage output to the power grid by the power electronic device based on the target signal includes:

[0026] The target signal is subjected to inertial processing to obtain the second frequency of the voltage;

[0027] The frequency of the voltage is obtained by determining the sum of the second frequency and the reference frequency;

[0028] The phase angle of the voltage is obtained by integrating the frequency of the voltage.

[0029] This application also provides a grid-connection control device for controlling grid-connection equipment using a grid-connection control strategy. The grid-connection equipment includes a new energy power generation device and power electronic equipment. The power electronic equipment is used to connect the new energy power generation device to the power grid. The grid-connection control device includes:

[0030] The power deviation module is used to determine the difference between the actual power value output by the power electronic device to the power grid and the power reference value;

[0031] The dead-zone control module is used to process the power deviation value according to a preset strategy to obtain the target signal;

[0032] An adjustment module is used to determine the phase angle of the voltage output from the power electronic device to the power grid based on the target signal, and to adjust the voltage output from the power electronic device to the power grid based on the phase angle.

[0033] The preset strategy is as follows:

[0034] Where x represents the power deviation value, u represents the target signal, a represents the first threshold, and b represents the second threshold.

[0035] This application also provides another grid-connection control device for controlling grid-connected equipment using a grid-connection control strategy. The grid-connected equipment includes a new energy power generation device and power electronic equipment. The power electronic equipment is used to connect the new energy power generation device to the power grid. The grid-connection control device includes:

[0036] The first determining module is used to determine the actual power value output by the power electronic equipment to the power grid;

[0037] The second determining module is used to determine the difference between the actual power value and the power reference value to obtain the power deviation value;

[0038] The processing module is used to process the power deviation value according to a preset strategy to obtain the target signal;

[0039] The third determining module is used to determine the phase angle of the voltage output to the power grid by the power electronic device based on the target signal;

[0040] An adjustment module is used to adjust the voltage output from the power electronic device to the power grid according to the phase angle;

[0041] The preset strategy is as follows:

[0042] Where x represents the power deviation value, u represents the target signal, a represents the first threshold, and b represents the second threshold.

[0043] According to a network configuration control device provided in this application, the second determining module may include:

[0044] The filtering submodule is used to filter the actual power value to obtain the filtered power value.

[0045] The first determining submodule is used to determine the difference between the filtered power value and the power reference value to obtain the power deviation value.

[0046] According to a network configuration control device provided in this application, the third determining module may include:

[0047] The first arithmetic submodule is used to amplify the target signal to obtain the first frequency of the voltage.

[0048] The second determining submodule is used to determine the sum of the first frequency and the reference frequency to obtain the frequency of the voltage;

[0049] The second calculation submodule is used to perform an integral operation on the frequency of the voltage to obtain the phase angle of the voltage.

[0050] According to a network configuration control device provided in this application, the third determining module may include:

[0051] The processing submodule is used to perform inertial processing on the target signal to obtain the second frequency of the voltage;

[0052] The third determining submodule is used to determine the sum of the second frequency and the reference frequency to obtain the frequency of the voltage;

[0053] The third operation submodule is used to perform an integral operation on the frequency of the voltage to obtain the phase angle of the voltage.

[0054] This application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the network control method as described above.

[0055] The present application further provides a non-transitory computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, implements any of the grid-forming control methods described above.

[0056] The present application further provides a computer program product, comprising a computer program, which when executed by a processor implements any of the grid-forming control methods described above.

[0057] To implement the grid-forming control method of the present application, first determine the actual power value output from the power electronic device to the power grid; then determine the difference between the actual power value and the power reference value to obtain a power deviation value; process the power deviation value according to a preset strategy to obtain a target signal; then determine the phase angle of the voltage output from the power electronic device to the power grid according to the target signal, and finally adjust the voltage output from the power electronic device to the power grid according to the phase angle. In the present application, a power dead zone link (i.e., implementing the preset strategy) is added to the grid-forming control strategy. When the power is within the dead zone (i.e., -b<x<a), the output phase angle of the grid-forming device remains unchanged, and it externally exhibits the characteristics of a voltage source with constant frequency and phase angle. Therefore, by introducing an ideal voltage source interval, the present application can effectively improve the ability of the grid-forming device to provide frequency support for the power grid. Description of Drawings

[0058] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings described below are some embodiments of the present application, and those of ordinary skill in the art can obtain other accompanying drawings based on these drawings without paying creative labor.

[0059] Figure 1 is a flowchart of a grid-forming control method shown according to an embodiment of the present application;

[0060] Figure 2 is a schematic diagram of grid-forming control logic shown according to an embodiment of the present application;

[0061] Figure 3 is a structural block diagram of a grid-forming control device provided by the present application; and

[0062] Figure 4 is a schematic diagram of the physical structure of an electronic device shown according to an embodiment of the present application. Detailed Description

[0063] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0064] The method of this application is applied to grid-type equipment that employs a grid-type control strategy. The grid-type equipment includes new energy power generation devices and power electronic devices, and the power electronic devices are used to connect the new energy power generation devices to the power grid.

[0065] In this application, grid-connected equipment includes new energy power generation devices (such as wind power generation devices, photovoltaic power generation devices, and energy storage power generation devices) and supporting power electronic equipment (such as converters and inverters). The power electronic equipment is responsible for converting the electrical energy from the new energy power generation devices into a form compatible with the power grid (such as DC to AC) and achieving grid connection. These devices work collaboratively through grid-connected control strategies (such as virtual synchronous machine control), and as a whole, they act as a "voltage source," actively supporting the grid frequency and voltage.

[0066] This application incorporates a power dead zone into the grid-type control strategy, introducing an ideal voltage source range with constant frequency and phase angle for the grid-type equipment, thereby effectively improving the ability of the grid-type equipment to provide frequency and voltage support to the power grid.

[0067] The execution entity of the network construction control method of this application is a network construction control device. Figure 1 is a flowchart illustrating a network construction control method according to an embodiment of this application. Referring to Figure 1, the network construction control method of this application may include the following steps.

[0068] Step 101: Determine the actual power output of the power electronic equipment to the power grid.

[0069] In this application, the network construction control logic used inside the network construction control device is shown in Figure 2. Figure 2 is a schematic diagram of a network construction control logic according to an embodiment of this application.

[0070] Referring to Figure 2, first obtain the actual power value P output by the power electronic device to the power grid. e The actual power output P of power electronic equipment to the power grid. e That is, the actual power output of the new energy power generation device to the power grid.

[0071] Step 102: Determine the difference between the actual power value and the power reference value to obtain the power deviation value.

[0072] Specifically, step 102 includes:

[0073] Filtering the actual power value to obtain a filtered power value;

[0074] Determining a difference between the filtered power value and a power reference value to obtain a power deviation value.

[0075] In the present application, the power reference value P ref is for the actual power value P e is a set reference value. After determining the actual power value P e then, the actual power value P is first filtered by a filtering module e is filtered to obtain a filtered power value z, then the current power reference value P is calculated by a power difference module ref and the difference between the filtered power value z, and said difference is the power deviation value x.

[0076] In FIG. 2, the first ∑ is the operation logic corresponding to the power difference module, is the internal operation logic of the filtering module, wherein, w p represents the Cut-off Frequency, w p is used to set the suppression capability of the filtering module for high-frequency noise. When the signal frequency exceeds w p , the filtering module starts to attenuate the signal amplitude, ensuring that the actual power value P received by subsequent control links e is smoother and more stable. s represents the Laplace Operator, which is a complex variable used to describe the transfer function of a filter.

[0077] Step 103: Processing the power deviation value according to a preset strategy to obtain a target signal.

[0078] The preset strategy is as follows:

[0079] wherein, x represents the power deviation value, u represents the target signal, a represents a first threshold, and b represents a second threshold.

[0080] Referring to FIG. 2, after inputting the power deviation value x into a dead zone control module, the dead zone control module controls the output target signal u according to the magnitude relationship between x and a and b. If x≤-b, u=x+b; if -b<x<a, u=0; if x≥a, u=x-a. Wherein, a and b can be set according to experience. In FIG. 2, the part within the dashed box is the processing logic corresponding to the dead zone control module.

[0081] The present application also provides a method b for setting the second threshold of a power dead zone link, and the second threshold b can be specifically determined in the following manner:

[0082] Determine the maximum active power value P that the power electronic equipment can sustainably output based on the current state of the network-type equipment. max ;

[0083] The maximum active power value P max Compared with the current power reference value P ref The difference between them is determined as the second threshold b.

[0084] In this application, the second threshold b is set to b = P max -P ref This allows network-type equipment to fully utilize its backup capacity when facing disturbances, while preventing its output from exceeding its theoretical maximum output P for extended periods. max This ensures the safe and stable operation of network-type equipment.

[0085] For example, taking a wind turbine as a new energy power generation device, the maximum theoretical output P of the wind turbine is first estimated based on the current wind speed. max (i.e., the maximum active power output to the grid), then, P max Subtract the current power reference value P of the wind turbine ref This yields the second threshold b. In this way, the wind turbine can utilize its maximum reserve capacity when facing disturbances, while ensuring that its output does not exceed the theoretical maximum value P for an extended period. max This ensures its own safe and stable operation.

[0086] Step 104: Determine the phase angle of the voltage output from the power electronic equipment to the power grid based on the target signal.

[0087] In one implementation, step 104 may include:

[0088] The target signal is amplified to obtain the first frequency of the voltage;

[0089] The frequency of the voltage is obtained by determining the sum of the first frequency and the reference frequency;

[0090] The phase angle of the voltage is obtained by integrating the frequency of the voltage.

[0091] Referring to Figure 2, input u into the proportional control module, and the proportional control module will adjust according to K. p The voltage frequency ω′ is obtained by scaling up the voltage. Then, the first frequency ω′ and the reference frequency ω0 are superimposed by the frequency synthesis module to obtain the voltage frequency ω. Next, the voltage frequency ω is input to the phase angle generation module, which integrates the voltage frequency to obtain the voltage phase angle θ.

[0092] In Figure 2, K pis the proportional gain in the proportional control module, and the second ∑ corresponds to the operation logic in the frequency synthesis module, which corresponds to the operation logic in the phase angle generation module.

[0093] In another embodiment, step 104 may comprise:

[0094] performing inertia processing on the target signal to obtain a second frequency of the voltage;

[0095] determining the sum of the second frequency and a reference frequency to obtain the frequency of the voltage;

[0096] performing integration operation on the frequency of the voltage to obtain the phase angle of the voltage.

[0097] In the present application, u may also be input into an inertia processing module, which is configured to perform inertia processing on the target signal u to obtain the second frequency of the voltage, and then a frequency synthesis module superimposes the second frequency and the reference frequency to obtain the frequency ω of the voltage.

[0098] In Figure 2, corresponds to the operation logic in the inertia processing module, T J is configured to simulate the moment of inertia of a synchronous generator, D is a damping coefficient configured to adjust the damping characteristic of a filter module and prevent the system from oscillating during the filtering process.

[0099] Step 105: adjusting the voltage output from the power electronic device to the power grid according to the phase angle.

[0100] In the present application, adjusting the voltage output from the power electronic device to the power grid through the phase angle can enable the grid-forming device to actively adjust the frequency and phase angle of the power grid.

[0101] In the present application, the principle of improving the frequency support capability of the grid-forming device for the power grid by adding a power dead zone link is as follows:

[0102] First, filtering out micro power fluctuations and reducing invalid adjustment. In a traditional grid-forming control, as long as the actual power P e deviates from the power reference value P ref the system will adjust the frequency and phase angle. However, in actual operation, the power may have micro fluctuations due to measurement noise, micro disturbances of the power grid and other factors. After the power dead zone link is added, if the power deviation is within the dead zone (-b<x<a), the output u of the dead zone link is 0, and the subsequent control links will not respond to these micro deviations. In this way, frequent adjustment of frequency and phase angle caused by micro fluctuations can be avoided, so that the device keeps the frequency and phase angle constant within the dead zone range, which is equivalent to presenting an ideal voltage source characteristic to the outside, thereby stably supporting the power grid frequency.

[0103] Second, it enhances system robustness and suppresses control oscillations. Power measurement errors or short-term disturbances can cause high-frequency oscillations in the control signal. Dead-zone elements prevent such oscillations from propagating to subsequent control stages by shielding the power deviation signal within the dead zone. For example, when the power deviation is small, the dead-zone output u = 0, and the frequency ω will not fluctuate due to noise interference, effectively suppressing control oscillations, improving the robustness of the system (the entire network-type equipment) to disturbances, and ensuring operational stability.

[0104] Third, by defining the ideal voltage source range, grid interaction is simplified. Within the dead zone, grid-connected equipment is equivalent to a voltage source with constant frequency and phase angle, simplifying the interaction model between the grid and the equipment. The grid side does not need to cope with frequency fluctuations caused by minute power changes in the equipment, and the equipment can provide reference frequency support to the grid more stably. Especially in scenarios with multiple devices connected to the grid, this reduces coordination disturbances caused by frequent adjustments between devices, further enhancing the overall frequency support capability.

[0105] In this application, a power dead zone is added to the grid-type control. When the power is within the dead zone, the phase angle of the grid-type equipment output remains unchanged, exhibiting voltage source characteristics with constant frequency and phase angle. By introducing an ideal voltage source range, this application can effectively improve the frequency support capability and stability of the grid-type equipment for the power grid.

[0106] This application also provides a grid-connection control device for controlling grid-connection equipment using a grid-connection control strategy. The grid-connection equipment includes new energy power generation devices and power electronic equipment. The power electronic equipment is used to connect the new energy power generation devices to the power grid. The grid-connection control device includes:

[0107] The power deviation module is used to determine the difference between the actual power output of the power electronic equipment to the power grid and the power reference value;

[0108] The dead-zone control module is used to process the power deviation value according to a preset strategy to obtain the target signal;

[0109] The adjustment module is used to determine the phase angle of the voltage output from the power electronic device to the grid based on the target signal, and to adjust the voltage output from the power electronic device to the grid based on the phase angle.

[0110] The default strategy is as follows:

[0111] Where x represents the power deviation value, u represents the target signal, a represents the first threshold, and b represents the second threshold.

[0112] For descriptions of the power deviation module and dead zone control module, please refer to the previous text.

[0113] In one embodiment, the network control device may further include:

[0114] The filtering module is used to filter the actual power value to obtain the filtered power value;

[0115] The power deviation module is also used to determine the difference between the filtered power value and the power reference value to obtain the power deviation value.

[0116] In one implementation, the adjustment module includes:

[0117] The proportional control module amplifies the target signal to obtain the first frequency of the voltage;

[0118] The frequency synthesis module is used to determine the sum of the first frequency and the reference frequency to obtain the frequency of the voltage;

[0119] The phase angle generation module is used to perform integral calculations on the voltage frequency to obtain the voltage phase angle.

[0120] For descriptions of the proportional control module, frequency synthesis module, and phase angle generation module, please refer to the previous text.

[0121] In one implementation, the adjustment module includes:

[0122] The inertial processing module is used to perform inertial processing on the target signal to obtain the second frequency of the voltage;

[0123] The frequency synthesis module is also used to determine the sum of the second frequency and the reference frequency to obtain the frequency of the voltage.

[0124] For a description of the inertial processing module, please refer to the previous text.

[0125] This application incorporates a power dead zone in network-type control. When the power is within the dead zone, the phase angle of the output of the network-type device remains unchanged, exhibiting voltage source characteristics with constant frequency and phase angle. By introducing an ideal voltage source range, the frequency support capability and stability of the network-type device can be effectively improved, solving the problems in related technologies.

[0126] This application also provides another grid-connection control device for controlling grid-connected equipment using a grid-connection control strategy. The grid-connected equipment includes a new energy power generation device and power electronic equipment. The power electronic equipment is used to connect the new energy power generation device to the power grid. This grid-connection control device is shown in Figure 3. Figure 3 is a structural block diagram of a grid-connection control device provided in this application. Referring to Figure 3, the grid-connection control device 300 may include:

[0127] The first determining module 301 is used to determine the actual power value output by the power electronic device to the power grid;

[0128] The second determining module 302 is used to determine the difference between the actual power value and the power reference value to obtain the power deviation value;

[0129] Processing module 303 is used to process the power deviation value according to a preset strategy to obtain the target signal;

[0130] The third determining module 304 is used to determine the phase angle of the voltage output to the power grid by the power electronic device based on the target signal;

[0131] The adjustment module 305 is used to adjust the voltage output from the power electronic device to the power grid according to the phase angle;

[0132] The preset strategy is as follows:

[0133] Where x represents the power deviation value, u represents the target signal, a represents the first threshold, and b represents the second threshold.

[0134] According to the network control device 300 provided in this application, the second threshold is determined as follows:

[0135] Based on the current state of the network-type equipment, determine the maximum active power value that the power electronic equipment can continuously output;

[0136] The difference between the maximum active power value and the power reference value is determined as the second threshold. According to a grid control device 300 provided in this application, the second determining module 302 may include:

[0137] The filtering submodule is used to filter the actual power value to obtain the filtered power value.

[0138] The first determining submodule is used to determine the difference between the filtered power value and the power reference value to obtain the power deviation value.

[0139] According to the network control device 300 provided in this application, the third determining module 304 may include:

[0140] The first arithmetic submodule is used to amplify the target signal to obtain the first frequency of the voltage.

[0141] The second determining submodule is used to determine the sum of the first frequency and the reference frequency to obtain the frequency of the voltage;

[0142] The second calculation submodule is used to perform an integral operation on the frequency of the voltage to obtain the phase angle of the voltage.

[0143] According to the network control device 300 provided in this application, the third determining module 304 may include:

[0144] The processing submodule is used to perform inertial processing on the target signal to obtain the second frequency of the voltage;

[0145] The third determining submodule is used to determine the sum of the second frequency and the reference frequency to obtain the frequency of the voltage;

[0146] The third operation submodule is used to perform an integral operation on the frequency of the voltage to obtain the phase angle of the voltage.

[0147] Figure 4 is a schematic diagram of the physical structure of an electronic device according to an embodiment of this application. As shown in Figure 4, the electronic device may include: a processor 410, a communication interface 420, a memory 430, and a communication bus 440. The processor 410, communication interface 420, and memory 430 communicate with each other via the communication bus 440. The processor 410 can call logical instructions in the memory 430 to execute a network control method, which includes:

[0148] Determine the actual power output of the power electronic equipment to the power grid;

[0149] The difference between the actual power value and the power reference value is determined to obtain the power deviation value;

[0150] The power deviation value is processed according to a preset strategy to obtain the target signal;

[0151] The phase angle of the voltage output to the power grid by the power electronic device is determined based on the target signal;

[0152] The voltage output from the power electronic device to the power grid is adjusted according to the phase angle;

[0153] The preset strategy is as follows:

[0154] Where x represents the power deviation value, u represents the target signal, a represents the first threshold, and b represents the second threshold.

[0155] Furthermore, the logical instructions in the aforementioned memory 430 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0156] On the other hand, this application also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to execute the network control method provided by the above methods, the method including:

[0157] Determine the actual power output of the power electronic equipment to the power grid;

[0158] The difference between the actual power value and the power reference value is determined to obtain the power deviation value;

[0159] The power deviation value is processed according to a preset strategy to obtain the target signal;

[0160] The phase angle of the voltage output to the power grid by the power electronic device is determined based on the target signal;

[0161] The voltage output from the power electronic device to the power grid is adjusted according to the phase angle;

[0162] The preset strategy is as follows:

[0163] Where x represents the power deviation value, u represents the target signal, a represents the first threshold, and b represents the second threshold.

[0164] In another aspect, this application also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform the grid control method provided by the above methods, the method comprising: determining the actual power value output by the power electronic device to the power grid;

[0165] The difference between the actual power value and the power reference value is determined to obtain the power deviation value;

[0166] The power deviation value is processed according to a preset strategy to obtain the target signal;

[0167] The phase angle of the voltage output to the power grid by the power electronic device is determined based on the target signal;

[0168] The voltage output from the power electronic device to the power grid is adjusted according to the phase angle;

[0169] The preset strategy is as follows:

[0170] Where x represents the power deviation value, u represents the target signal, a represents the first threshold, and b represents the second threshold.

[0171] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0172] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0173] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A network control method, applied to networked devices employing a network control strategy, wherein, The grid-connected equipment includes a new energy power generation device and power electronic equipment. The power electronic equipment is used to connect the new energy power generation device to the power grid. The grid-connected control method includes: Determine the actual power output of the power electronic equipment to the power grid; The difference between the actual power value and the power reference value is determined to obtain the power deviation value; The power deviation value is processed according to a preset strategy to obtain the target signal; The phase angle of the voltage output to the power grid by the power electronic device is determined based on the target signal; The voltage output from the power electronic device to the power grid is adjusted according to the phase angle; The preset strategy is as follows: Where x represents the power deviation value, u represents the target signal, a represents the first threshold, and b represents the second threshold.

2. The network control method according to claim 1, wherein, The second threshold is determined as follows: Based on the current state of the network-type equipment, determine the maximum active power value that the power electronic equipment can continuously output; The difference between the maximum active power value and the power reference value is determined as the second threshold.

3. The network control method according to claim 1, wherein, Determining the difference between the actual power value and the power reference value to obtain the power deviation value includes: The actual power value is filtered to obtain the filtered power value; The power deviation value is obtained by determining the difference between the filtered power value and the power reference value.

4. The network control method according to claim 1, wherein, Determining the phase angle of the voltage output to the power grid by the power electronic device based on the target signal includes: The target signal is amplified to obtain the first frequency of the voltage; The frequency of the voltage is obtained by determining the sum of the first frequency and the reference frequency; The phase angle of the voltage is obtained by integrating the frequency of the voltage.

5. The network control method according to claim 1, wherein, Determining the phase angle of the voltage output to the power grid by the power electronic device based on the target signal includes: The target signal is subjected to inertial processing to obtain the second frequency of the voltage; The frequency of the voltage is obtained by determining the sum of the second frequency and the reference frequency; The phase angle of the voltage is obtained by integrating the frequency of the voltage.

6. A network control device for controlling networked equipment using a network-based control strategy, wherein, The grid-connecting equipment includes a new energy power generation device and power electronic equipment. The power electronic equipment is used to connect the new energy power generation device to the power grid. The grid-connecting control device includes: The power deviation module is used to determine the difference between the actual power value output by the power electronic device to the power grid and the power reference value; The dead-zone control module is used to process the power deviation value according to a preset strategy to obtain the target signal; An adjustment module is used to determine the phase angle of the voltage output from the power electronic device to the power grid based on the target signal, and to adjust the voltage output from the power electronic device to the power grid based on the phase angle. The preset strategy is as follows: Where x represents the power deviation value, u represents the target signal, a represents the first threshold, and b represents the second threshold.

7. The network control device according to claim 5 further includes: A filtering module is used to filter the actual power value to obtain a filtered power value. The power deviation module is also used to determine the difference between the filtered power value and the power reference value to obtain the power deviation value.

8. The network control device according to claim 5, wherein, The adjustment module includes: The proportional control module amplifies the target signal to obtain the first frequency of the voltage; A frequency synthesis module is used to determine the sum of the first frequency and the reference frequency to obtain the frequency of the voltage; The phase angle generation module is used to perform an integral operation on the frequency of the voltage to obtain the phase angle of the voltage.

9. The network control device according to claim 7, wherein, The adjustment module further includes: An inertial processing module is used to perform inertial processing on the target signal to obtain the second frequency of the voltage; The frequency synthesis module is also used to determine the sum of the second frequency and the reference frequency to obtain the frequency of the voltage.

10. A network control device for controlling network-type equipment using a network-type control strategy, wherein, The grid-connecting equipment includes a new energy power generation device and power electronic equipment. The power electronic equipment is used to connect the new energy power generation device to the power grid. The grid-connecting control device includes: The first determining module is used to determine the actual power value output by the power electronic equipment to the power grid; The second determining module is used to determine the difference between the actual power value and the power reference value to obtain the power deviation value; The processing module is used to process the power deviation value according to a preset strategy to obtain the target signal; The third determining module is used to determine the phase angle of the voltage output to the power grid by the power electronic device based on the target signal; An adjustment module is used to adjust the voltage output from the power electronic device to the power grid according to the phase angle; The preset strategy is as follows: Where x represents the power deviation value, u represents the target signal, a represents the first threshold, and b represents the second threshold.

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