A network construction control method and device

Abstract

The application provides a network construction control method and device, which are applied to network construction type equipment (including new energy power generation devices and power electronic devices) adopting a network construction type control strategy. The power electronic devices are used for incorporating the new energy power generation devices into a power grid. The method comprises the following steps: determining an actual power value output by the power electronic devices to the power grid; determining a power deviation value according to a difference between the actual power value and a power reference value; processing the power deviation value according to a preset strategy to obtain a target signal; determining a phase angle of a voltage output by the power electronic devices to the power grid according to the target signal; and adjusting the voltage output by the power electronic devices to the power grid according to the phase angle. The application adds a power dead zone link (i.e. implements the preset strategy) in the network construction type control. When the power is located in the dead zone, the phase angle output by the network construction type equipment is unchanged, and the network construction type equipment presents a voltage source characteristic with constant frequency and phase angle, so that the frequency support capability and stability of the network construction type equipment can be effectively improved.

Description

Technical Field

[0001] This application relates to the field of power system control technology, and in particular to a grid control method and apparatus. Background Technology

[0002] With the rapid development of new energy sources connected to the grid via power electronic devices, the characteristics of new power systems with high proportions of new energy and 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. The core of grid-based control is to enable power electronic interface power sources (including wind power, photovoltaics, and energy storage) to exhibit voltage source characteristics, thereby actively providing frequency and voltage support to the grid. The control link that generates the phase angle of the external voltage source is the core of the grid-based control strategy. The grid-based control strategy mainly adopts feedback control with power as input, adjusting the frequency and phase angle of the voltage source according to the output power of the power electronic devices (responsible for connecting the power electronic interface power sources to the grid). There are various specific control strategies, including active power frequency droop control and virtual synchronous machine control. However, these control strategies have limited ability to provide frequency support to the grid and need further improvement. Summary of the Invention

[0003] 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-type equipment, which can effectively improve the frequency support capability and stability of the grid-type equipment.

[0004] 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:

[0005] Determine the actual power output of the power electronic equipment to the power grid;

[0006] The difference between the actual power value and the power reference value is determined to obtain the power deviation value;

[0007] The power deviation value is processed according to a preset strategy to obtain the target signal;

[0008] The phase angle of the voltage output to the power grid by the power electronic device is determined based on the target signal;

[0009] The voltage output from the power electronic device to the power grid is adjusted according to the phase angle;

[0010] The preset strategy is as follows:

[0011]

[0012] in, This indicates the power deviation value. This refers to the target signal. Indicates the first threshold. This indicates the second threshold.

[0013] According to a network control method provided in this application, the second threshold is determined as follows:

[0014] Based on the current state of the network-type equipment, determine the maximum active power value that the power electronic equipment can continuously output;

[0015] 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:

[0016] The actual power value is filtered to obtain the filtered power value;

[0017] The power deviation value is obtained by determining the difference between the filtered power value and the power reference value.

[0018] 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:

[0019] The target signal is amplified to obtain the first frequency of the voltage;

[0020] The frequency of the voltage is obtained by determining the sum of the first frequency and the reference frequency;

[0021] The phase angle of the voltage is obtained by integrating the frequency of the voltage.

[0022] 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:

[0023] The target signal is subjected to inertial processing to obtain the second frequency of the voltage;

[0024] The frequency of the voltage is obtained by determining the sum of the second frequency and the reference frequency;

[0025] The phase angle of the voltage is obtained by integrating the frequency of the voltage.

[0026] 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:

[0027] 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;

[0028] The dead-zone control module is used to process the power deviation value according to a preset strategy to obtain the target signal;

[0029] 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.

[0030] The preset strategy is as follows:

[0031]

[0032] in, This indicates the power deviation value. This refers to the target signal. Indicates the first threshold. This indicates the second threshold.

[0033] 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:

[0034] The first determining module is used to determine the actual power value output by the power electronic equipment to the power grid;

[0035] 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;

[0036] The processing module is used to process the power deviation value according to a preset strategy to obtain the target signal;

[0037] 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;

[0038] An adjustment module is used to adjust the voltage output from the power electronic device to the power grid according to the phase angle;

[0039] The preset strategy is as follows:

[0040]

[0041] in, This indicates the power deviation value. This refers to the target signal. Indicates the first threshold. This indicates the second threshold.

[0042] According to a network configuration control device provided in this application, the second determining module may include:

[0043] The filtering submodule is used to filter the actual power value to obtain the filtered power value.

[0044] 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.

[0045] According to a network configuration control device provided in this application, the third determining module may include:

[0046] The first arithmetic submodule is used to amplify the target signal to obtain the first frequency of the voltage.

[0047] 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;

[0048] 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.

[0049] According to a network configuration control device provided in this application, the third determining module may include:

[0050] The processing submodule is used to perform inertial processing on the target signal to obtain the second frequency of the voltage;

[0051] 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;

[0052] 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.

[0053] 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.

[0054] This application also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the network control method as described above.

[0055] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the network control method as described above.

[0056] Implementing the grid-connected control method of this application involves first determining the actual power value output by the power electronic device to the power grid; then, determining the difference between the actual power value and a power reference value to obtain a power deviation value; processing the power deviation value according to a preset strategy to obtain a target signal; then determining the phase angle of the voltage output by the power electronic device to the power grid based on the target signal; and finally adjusting the voltage output by the power electronic device to the power grid based on the phase angle. This application incorporates a power dead zone element (i.e., implementing a preset strategy) into the grid-connected control strategy. When the power is within the dead zone (i.e.... When the phase angle of the output of the grid-type equipment remains unchanged, it exhibits voltage source characteristics with constant frequency and phase angle. Therefore, this application can effectively improve the ability of the grid-type equipment to provide frequency support to the power grid by introducing an ideal voltage source range. Attached Figure Description

[0057] To more clearly illustrate the technical solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0058] Figure 1 This is a flowchart illustrating a network control method according to an embodiment of this application;

[0059] Figure 2 This is a schematic diagram of network control logic shown in one embodiment of this application;

[0060] Figure 3 This is a structural block diagram of a network control device provided in this application;

[0061] Figure 4 This is a schematic diagram of the physical structure of an electronic device according to an embodiment of this application. Detailed Implementation

[0062] 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.

[0063] 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.

[0064] 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 the whole system acts as a "voltage source," actively supporting the grid frequency and voltage.

[0065] 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.

[0066] The implementing entity of the network construction control method in this application is a network construction control device. Figure 1 This is a flowchart illustrating a network control method according to an embodiment of this application. (Refer to...) Figure 1 The network control method of this application may include:

[0067] Step 101: Determine the actual power output of the power electronic equipment to the power grid.

[0068] In this application, the network control logic used inside the network control device is as follows: Figure 2 As shown. Figure 2 This is a schematic diagram of a network control logic shown in one embodiment of this application.

[0069] Reference Figure 2 First, obtain the actual power output of the power electronic equipment to the power grid. The actual power output of power electronic equipment to the power grid. That is, the actual power output of the new energy power generation device to the power grid.

[0070] Step 102: Determine the difference between the actual power value and the power reference value to obtain the power deviation value.

[0071] Specifically, step 102 includes:

[0072] The actual power value is filtered to obtain the filtered power value.

[0073] The power deviation value is obtained by determining the difference between the filtered power value and the power reference value.

[0074] In this application, the power reference value This refers to the actual power value. The set reference value. This is used to determine the actual power value. Then, the actual power value is first processed through a filtering module. The power value is obtained by filtering. Then, the current power reference value is calculated through the power difference module. With the filtered power value The difference is the power deviation value. .

[0075] exist Figure 2 In the middle, the first This refers to the computational logic corresponding to the power difference module. This refers to the internal operational logic of the filtering module, where... This indicates the cut-off frequency. Used to set the filtering module's ability to suppress high-frequency noise. When the signal frequency exceeds... At this time, the filtering module begins to attenuate the signal amplitude to ensure that the subsequent control circuit receives the actual power value. Smoother and more stable. This represents the Laplace operator, used to describe the complex variables of the filter transfer function.

[0076] Step 103: Process the power deviation value according to the preset strategy to obtain the target signal.

[0077] The default strategy is as follows:

[0078]

[0079] in, Indicates the power deviation value. Indicates the target signal. Indicates the first threshold. This indicates the second threshold.

[0080] Reference Figure 2 Power deviation value After inputting the dead-time control module, the dead-time control module follows... and and The magnitude relationship controls the output target signal .like , ;like , ;like , .in, and You can set it up based on experience. Figure 2 In the diagram, the part within the dashed box represents the processing logic corresponding to the dead zone control module.

[0081] This application also provides a method for setting a second threshold for a power dead-time circuit. Second threshold Specifically, it can be determined in the following ways:

[0082] Determine the maximum sustainable active power output of the power electronic equipment based on the current state of the network-type equipment. ;

[0083] Maximum active power value Compared with the current power reference value The difference between them is determined as the second threshold. .

[0084] In this application, the second threshold is... Set as This allows network-type equipment to fully utilize its backup capacity when facing disturbances, while preventing its output from exceeding its theoretical maximum output for extended periods. 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 of the wind turbine is first estimated based on the current wind speed. (That is, the maximum active power output to the power grid), then, Subtract the current power reference value of the wind turbine The second threshold is obtained. In this way, wind turbines can utilize their maximum reserve capacity when facing disturbances, while ensuring that their output does not exceed the theoretical maximum value for extended periods. 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] Reference Figure 2 ,Will Input to the proportional control module, the proportional control module according to By performing proportional amplification, the first frequency of the voltage is obtained. Next, the first frequency is synthesized using the frequency synthesis module. and reference frequency By superimposing the values, the frequency of the voltage can be obtained. Next, the frequency of the voltage... The input phase angle generation module performs an integral operation on the voltage frequency to obtain the voltage phase angle. .

[0092] exist Figure 2 middle, For the proportional gain in the proportional control module, the second one... The corresponding operational logic in the frequency synthesis module, The corresponding operational logic in the phase angle generation module.

[0093] In another implementation, step 104 may include:

[0094] The target signal is subjected to inertial processing to obtain the second frequency of the voltage;

[0095] The frequency of the voltage is obtained by determining the sum of the second frequency and the reference frequency;

[0096] The phase angle of the voltage is obtained by integrating the frequency of the voltage.

[0097] In this application, it is also possible to include The input inertial processing module is used to process the target signal. Inertial processing is performed to obtain the second frequency of the voltage. Then, the frequency synthesis module superimposes the second frequency and the reference frequency to obtain the voltage frequency. .

[0098] exist Figure 2 middle, The corresponding computational logic in the inertial processing module, Used to simulate the moment of inertia of a synchronous generator. This is the damping coefficient, used to adjust the damping characteristics of the filter module to prevent oscillations in the system during the filtering process.

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

[0100] In this application, by adjusting the phase angle of the voltage output to the power grid by the power electronic equipment, the grid-type equipment can actively adjust the frequency and phase angle of the power grid.

[0101] In this application, the principle of improving the frequency support capability of grid-connected equipment to the power grid by adding a power dead zone is as follows:

[0102] First, it filters out minute power fluctuations, reducing ineffective regulation. In traditional grid-type control, only the actual power value... Compared with power reference value If a deviation exists, the system will adjust the frequency and phase angle. However, in actual operation, power may fluctuate slightly due to measurement noise, minor grid disturbances, etc. Adding a power dead-zone stage can mitigate this by adjusting the power deviation within the dead-zone. Within ) the dead zone output Subsequent control circuits will not respond to these minute deviations. In this way, frequent adjustments to frequency and phase angle caused by minute fluctuations can be avoided, allowing the equipment to maintain constant frequency and phase angle within the dead zone, which is equivalent to presenting ideal voltage source characteristics to the outside world, thereby stably supporting the 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... For, frequency It will not fluctuate due to noise interference, can effectively suppress and control oscillations, improve the robustness of the system (the entire network-type equipment) to cope with disturbances, and ensure 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]

[0112] in, Indicates the power deviation value. Indicates the target signal. Indicates the first threshold. This indicates the second threshold.

[0113] For descriptions of the power deviation module and dead zone control module, please refer to the previous text.

[0114] In one embodiment, the network control device may further include:

[0115] The filtering module is used to filter the actual power value to obtain the filtered power value;

[0116] 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.

[0117] In one implementation, the adjustment module includes:

[0118] The proportional control module amplifies the target signal to obtain the first frequency of the voltage;

[0119] 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;

[0120] The phase angle generation module is used to perform integral calculations on the voltage frequency to obtain the voltage phase angle.

[0121] For descriptions of the proportional control module, frequency synthesis module, and phase angle generation module, please refer to the previous text.

[0122] In one implementation, the adjustment module includes:

[0123] The inertial processing module is used to perform inertial processing on the target signal to obtain the second frequency of the voltage;

[0124] 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.

[0125] For a description of the inertial processing module, please refer to the previous text.

[0126] 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.

[0127] 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 as follows: Figure 3 As shown. Figure 3 This is a structural block diagram of a network control device provided in this application. (Refer to...) Figure 3 The network control device 300 may include:

[0128] The first determining module 301 is used to determine the actual power value output by the power electronic equipment to the power grid;

[0129] 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;

[0130] Processing module 303 is used to process the power deviation value according to a preset strategy to obtain the target signal;

[0131] 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;

[0132] 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;

[0133] The preset strategy is as follows:

[0134]

[0135] in, This indicates the power deviation value. This refers to the target signal. Indicates the first threshold. This indicates the second threshold.

[0136] According to the network control device 300 provided in this application, the second threshold is determined as follows:

[0137] Based on the current state of the network-type equipment, determine the maximum active power value that the power electronic equipment can continuously output;

[0138] 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:

[0139] The filtering submodule is used to filter the actual power value to obtain the filtered power value.

[0140] 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.

[0141] According to the network control device 300 provided in this application, the third determining module 304 may include:

[0142] The first arithmetic submodule is used to amplify the target signal to obtain the first frequency of the voltage.

[0143] 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;

[0144] 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.

[0145] According to the network control device 300 provided in this application, the third determining module 304 may include:

[0146] The processing submodule is used to perform inertial processing on the target signal to obtain the second frequency of the voltage;

[0147] 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;

[0148] 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.

[0149] Figure 4 This is a schematic diagram of the physical structure of an electronic device according to an embodiment of this application, as shown below. Figure 4As shown, the electronic device may include: a processor 410, a communications interface 420, a memory 430, and a communication bus 440, wherein the processor 410, the communications interface 420, and the 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:

[0150] Determine the actual power output of the power electronic equipment to the power grid;

[0151] The difference between the actual power value and the power reference value is determined to obtain the power deviation value;

[0152] The power deviation value is processed according to a preset strategy to obtain the target signal;

[0153] The phase angle of the voltage output to the power grid by the power electronic device is determined based on the target signal;

[0154] The voltage output from the power electronic device to the power grid is adjusted according to the phase angle;

[0155] The preset strategy is as follows:

[0156]

[0157] in, This indicates the power deviation value. This refers to the target signal. Indicates the first threshold. This indicates the second threshold.

[0158] 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.

[0159] 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:

[0160] Determine the actual power output of the power electronic equipment to the power grid;

[0161] The difference between the actual power value and the power reference value is determined to obtain the power deviation value;

[0162] The power deviation value is processed according to a preset strategy to obtain the target signal;

[0163] The phase angle of the voltage output to the power grid by the power electronic device is determined based on the target signal;

[0164] The voltage output from the power electronic device to the power grid is adjusted according to the phase angle;

[0165] The preset strategy is as follows:

[0166]

[0167] in, This indicates the power deviation value. This refers to the target signal. Indicates the first threshold. This indicates the second threshold.

[0168] 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;

[0169] The difference between the actual power value and the power reference value is determined to obtain the power deviation value;

[0170] The power deviation value is processed according to a preset strategy to obtain the target signal;

[0171] The phase angle of the voltage output to the power grid by the power electronic device is determined based on the target signal;

[0172] The voltage output from the power electronic device to the power grid is adjusted according to the phase angle;

[0173] The preset strategy is as follows:

[0174]

[0175] in, This indicates the power deviation value. This refers to the target signal. Indicates the first threshold. This indicates the second threshold.

[0176] 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.

[0177] 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.

[0178] 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 spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A network control method, characterized in that, The grid-connected control method is 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: 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: ； in, This indicates the power deviation value. This refers to the target signal. Indicates the first threshold. This indicates the second threshold.

2. The network control method according to claim 1, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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 construction control device, characterized in that, A grid-connected control device is used to control grid-connected equipment using 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 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, and obtain the power deviation 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: ； in, This indicates the power deviation value. This refers to the target signal. Indicates the first threshold. This indicates the second threshold.

7. The network control device according to claim 6, characterized in that, Also 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 6, characterized in that, The adjustment module includes: A proportional control module is used to amplify 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 8, characterized in that, 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 construction control device, characterized in that, A grid-connected control device is used to control grid-connected equipment using 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 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: ； in, This indicates the power deviation value. This refers to the target signal. Indicates the first threshold. This indicates the second threshold.

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