Network construction control method and device

Abstract

The invention provides a network construction control method and device, the method and device are applied to network construction type equipment (including a new energy power generation device and power electronic equipment) adopting a network construction type control strategy, the power electronic equipment is used for connecting the new energy power generation device into a power grid, and the method comprises the following steps: determining an actual power value output to the power grid by the power electronic equipment; determining a power deviation value according to a difference value 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 voltage output to a power grid by the power electronic equipment according to the target signal; and adjusting the voltage output to the power grid by the power electronic equipment according to the phase angle. According to the invention, a power dead zone link (i.e., a preset strategy is implemented) is added 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 not changed, the voltage source characteristics with constant frequency and phase angle are presented externally, and the frequency supporting capability and stability of the network construction type equipment can be effectively improved.

Description

Technical Field

[0001] This application relates to the technical field of power system control, and particularly to a grid-forming control method and device. Background Art

[0002] With the rapid development of new energy grid-connected through power electronic devices, the characteristics of a new power system with a high proportion of new energy and a high proportion of power electronic devices have become increasingly prominent. Grid-forming technology is one of the key technologies to support the safe and stable operation of the new power system. The core of grid-forming control is to make the power electronic interface power sources (including wind power, photovoltaic power, energy storage, etc.) exhibit the external characteristics of a voltage source through control, so as to actively provide frequency and voltage support for the power grid. The control link for generating the phase angle of the external voltage source is the core of the grid-forming control strategy. The grid-forming control strategy mainly adopts feedback control with power as the input, and adjusts 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 power grid). There are various specific control strategies, including active frequency droop control, virtual synchronous machine control, etc. However, the ability of these control strategies to provide frequency support for the power grid is limited and needs to be further improved. Summary of the Invention

[0003] This application provides a grid-forming control method and device to solve the defect of limited ability to provide frequency support for the power grid in the prior art. This application adds a power dead zone link (implemented through a preset strategy) to the grid-forming control strategy, introducing an ideal voltage source interval with constant frequency and phase angle for the grid-forming devices, which can effectively improve the frequency support ability and stability of the grid-forming devices.

[0004] This application provides a grid-forming control method, which is applied to grid-forming devices adopting the grid-forming control strategy. The grid-forming devices include 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. The grid-forming control method includes: Determine the actual power value output by the power electronic device to the power grid; 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; Determine the phase angle of the voltage output by the power electronic device to the power grid according to the target signal; Adjust the voltage output by the power electronic device to the power grid according to the phase angle; The preset strategy is as follows: Wherein, represents the power deviation value, represents the target signal, represents a first threshold value, represents a second threshold value.

[0005] According to a grid-forming control method provided by the present application, the second threshold value is determined in the following manner: According to the current state of the grid-forming device, determine the maximum active power value that the power electronic device can continuously output; Determine the difference between the maximum active power value and the power reference value as the second threshold value. According to a grid-forming control method provided by the present application, determining the difference between the actual power value and the power reference value to obtain a power deviation value includes: Perform filtering processing on the actual power value to obtain a filtered power value; Determine the difference between the filtered power value and the power reference value to obtain the power deviation value.

[0006] According to a grid-forming control method provided by the present application, determining the phase angle of the voltage output by the power electronic device to the power grid according to the target signal includes: Perform amplification operation on the target signal to obtain the first frequency of the voltage; Determine the sum value of the first frequency and the reference frequency to obtain the frequency of the voltage; Perform integral operation on the frequency of the voltage to obtain the phase angle of the voltage.

[0007] According to a grid-forming control method provided by the present application, determining the phase angle of the voltage output by the power electronic device to the power grid according to the target signal includes: Perform inertia processing on the target signal to obtain the second frequency of the voltage; Determine the sum value of the second frequency and the reference frequency to obtain the frequency of the voltage; Perform integral operation on the frequency of the voltage to obtain the phase angle of the voltage.

[0008] The present application also provides a grid-forming control device for controlling a grid-forming device by adopting a grid-forming control strategy. The grid-forming device includes a new energy power generation device and a power electronic device. The power electronic device is used to connect the new energy power generation device to the power grid. The grid-forming control device includes: A power deviation value module for determining the difference between the actual power value output by the power electronic device to the power grid and the power reference value; A dead zone control module for processing the power deviation value according to a preset strategy to obtain a target signal; An adjustment module, configured to determine a phase angle of the voltage output from the power electronic device to the power grid according to the target signal, and adjust the voltage output from the power electronic device to the power grid according to the phase angle; The preset strategy is as follows: Wherein, represents the power deviation value, represents the target signal, represents a first threshold, represents a second threshold.

[0009] The present application further provides another network-forming control device, configured to control a network-forming device by using a network-forming control strategy. The network-forming device includes a new energy power generation device and a power electronic device. The power electronic device is configured to connect the new energy power generation device to the power grid. The network-forming control device includes: A first determination module, configured to determine an actual power value output from the power electronic device to the power grid; A second determination module, configured to determine a difference between the actual power value and a power reference value to obtain a power deviation value; A processing module, configured to process the power deviation value according to a preset strategy to obtain a target signal; A third determination module, configured to determine a phase angle of the voltage output from the power electronic device to the power grid according to the target signal; An adjustment module, configured 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: Wherein, represents the power deviation value, represents the target signal, represents a first threshold, represents a second threshold.

[0010] According to a network-forming control device provided by the present application, the second determination module may include: A filtering sub-module, configured to perform filtering processing on the actual power value to obtain a filtered power value; A first determination sub-module, configured to determine a difference between the filtered power value and the power reference value to obtain the power deviation value.

[0011] According to a network-forming control device provided by the present application, the third determination module may include: A first operation sub-module, configured to perform amplification operation on the target signal to obtain a first frequency of the voltage; A second determination sub-module, configured to determine a sum value of the first frequency and a reference frequency to obtain the frequency of the voltage; A second operation sub-module, configured to perform an integration operation on the frequency of the voltage to obtain the phase angle of the voltage.

[0012] According to a grid-forming control device provided by the present application, the third determination module may include: A processing sub-module, configured to perform inertia processing on the target signal to obtain a second frequency of the voltage; A third determination sub-module, configured to determine a sum value of the second frequency and a reference frequency to obtain the frequency of the voltage; A third operation sub-module, configured to perform an integration operation on the frequency of the voltage to obtain the phase angle of the voltage.

[0013] The present application further provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the grid-forming control method described in any one of the above is implemented.

[0014] The present application further provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the grid-forming control method described in any one of the above is implemented.

[0015] The present application further provides a computer program product, including a computer program. When the computer program is executed by a processor, the grid-forming control method described in any one of the above is implemented.

[0016] When implementing the grid-forming control method of the present application, first determine an actual power value output by the power electronic device to the power grid; then, determine a difference between the actual power value and a 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 a phase angle of a voltage output by the power electronic device to the power grid according to the target signal, and finally adjust the voltage output by the power electronic device to the power grid according to the phase angle. The present application adds a power dead zone link (i.e., implementing the preset strategy) to the grid-forming control strategy. When the power is within the dead zone (i.e., ), the phase angle of the output of the grid-forming device remains unchanged, presenting a voltage source characteristic with a constant frequency and phase angle to the outside. 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 the Drawings

[0017] To more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 is a flowchart of a network construction control method shown in an embodiment of the present application; Figure 2 is a schematic diagram of a network construction control logic shown in an embodiment of the present application; Figure 3 is a structural block diagram of a network construction control device provided by the present application; Figure 4 is a schematic diagram of the physical structure of an electronic device shown in an embodiment of the present application. Detailed implementation manners

[0019] To make the objectives, technical solutions, and advantages of the present application clearer, the following will clearly and completely describe the technical solutions in the present application in conjunction with the drawings in the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present application.

[0020] The method of the present application is applied to a network construction type device adopting a network construction type control strategy. The network construction type device includes a new energy power generation device and a power electronic device, and the power electronic device is used to connect the new energy power generation device to the power grid.

[0021] In the present application, the network construction type device includes a new energy power generation device (such as a wind power generation device, a photovoltaic power generation device, a energy storage power generation device) and a supporting power electronic device (such as a converter, an inverter, etc.). The power electronic device is responsible for converting the electrical energy of the new energy power generation device into a form matching the power grid (such as converting direct current to alternating current) and realizing grid connection. These devices work together through a network construction type control strategy (such as virtual synchronous machine control) and overall act as a "voltage source" to actively support the power grid frequency and voltage.

[0022] The present application adds a power dead zone link to the network construction type control strategy, introducing an ideal voltage source interval with constant frequency and phase angle for the network construction type device, thereby effectively improving the ability of the network construction type device to provide frequency and voltage support for the power grid.

[0023] The execution subject of the network construction control method of the present application is a network construction control device. Figure 1 is a flowchart of a network construction control method shown in an embodiment of the present application. Refer toFigure 1 , the network-forming control method of this application may include: Step 101, determine the actual power value output from the power electronic device to the power grid.

[0024] In this application, the network-forming control logic adopted inside the network-forming control device is as Figure 2 shown. Figure 2 It is a schematic diagram of a network-forming control logic shown in an embodiment of this application.

[0025] Referring to Figure 2 , first obtain the actual power value output from the power electronic device to the power grid . The actual power value output from the power electronic device to the power grid is also the actual power value output from the new energy power generation device to the power grid.

[0026] Step 102, determine the difference between the actual power value and the power reference value to obtain the power deviation value.

[0027] Specifically, step 102 includes: Perform filtering processing on the actual power value to obtain the filtered power value; Determine the difference between the filtered power value and the power reference value to obtain the power deviation value.

[0028] In this application, the power reference value is a reference value set for the actual power value . After determining the actual power value , first perform filtering processing on the actual power value through the filtering module to obtain the filtered power value , and then calculate the difference between the current power reference value and the filtered power value through the power difference module. This difference is the power deviation value .

[0029] In Figure 2 , the first is the operation logic corresponding to the power difference module, is the operation logic inside the filtering module, where represents the cut-off frequency, which is used to set the high-frequency noise suppression ability of the filtering module. When the signal frequency exceeds , the filtering module starts to attenuate the signal amplitude to ensure that the actual power value received by the subsequent control link is smoother and more stable. denotes the Laplace Operator, which is a complex variable used to describe the filter transfer function.

[0030] Step 103: Process the power deviation value according to a preset strategy to obtain the target signal.

[0031] The preset strategy is as follows: where denotes the power deviation value, denotes the target signal, denotes the first threshold, denotes the second threshold.

[0032] Referring to Figure 2 after the power deviation value is input into the dead zone control module, the dead zone control module controls the output target signal according to the magnitude relationship between and . If , ; if , ; if , , . Among them, and can be set according to experience. Figure 2 In

[0033] This application also provides a method for tuning the second threshold of the power dead zone link , and the second threshold can be determined specifically in the following way: Determine the maximum active power value that the power electronic device can continuously output according to the current state of the network-forming device ; Take the difference between the maximum active power value and the current power reference value as the second threshold .

[0034] In this application, setting the second threshold to can enable the network-forming device to fully utilize its reserve capacity when facing disturbances, and at the same time prevent its output from exceeding the theoretical maximum output for a long time , ensuring the safe and stable operation of the network-forming device.

[0035] Exemplarily, taking a new energy power generation device as a wind turbine as an example, first, estimate the current maximum theoretical output of the wind turbine (i.e., the maximum active power value output to the power grid). Then, subtract the current power reference value of the wind turbine to obtain a second threshold. In this way, the wind turbine can exert its maximum reserve capacity in the face of disturbances, while ensuring that its output does not exceed the theoretical maximum for a long time, thus ensuring its own safe and stable operation. (i.e., the maximum active power value output to the power grid), and then, subtract the current power reference value of the wind turbine to obtain a second threshold . In this way, the wind turbine can exert its maximum reserve capacity in the face of disturbances, while ensuring that its output does not exceed the theoretical maximum for a long time , thus ensuring its own safe and stable operation.

[0036] Step 104: Determine the phase angle of the voltage output from the power electronic device to the power grid according to the target signal.

[0037] In one implementation, step 104 may include: Perform an amplification operation on the target signal to obtain the first frequency of the voltage; Determine the sum value of the first frequency and the reference frequency to obtain the frequency of the voltage; Perform an integration operation on the frequency of the voltage to obtain the phase angle of the voltage.

[0038] Refer to Figure 2 , and input into the proportional control module. The proportional control module performs proportional amplification according to to obtain the first frequency of the voltage . Then, the first frequency and the reference frequency are superimposed by the frequency synthesis module to obtain the frequency of the voltage . Then, the frequency of the voltage is input into the phase angle generation module. The phase angle generation module performs an integration operation on the frequency of the voltage to obtain the phase angle of the voltage .

[0039] In Figure 2 , is the proportional gain in the proportional control module, the second corresponds to the operation logic in the frequency synthesis module, and corresponds to the operation logic in the phase angle generation module.

[0040] In another implementation, step 104 may include: Perform an inertia processing on the target signal to obtain the second frequency of the voltage; Determine the sum value of the second frequency and the reference frequency to obtain the frequency of the voltage; Perform an integration operation on the frequency of the voltage to obtain the phase angle of the voltage.

[0041] In this application, it is also possible to input an inertia processing module for performing inertia processing on the target signal to obtain the second frequency of the voltage. Then, the frequency synthesis module superimposes the second frequency and the reference frequency to obtain the frequency of the voltage .

[0042] In Figure 2 , corresponding to the operation logic in the inertia processing module, is used to simulate the moment of inertia of the synchronous generator, is the damping coefficient, which is used to adjust the damping characteristics of the filtering module to avoid oscillations in the system during the filtering process.

[0043] Step 105: Adjust the voltage output from the power electronic device to the power grid according to the phase angle.

[0044] In this application, by adjusting the voltage output from the power electronic device to the power grid according to the phase angle, the grid-forming device can actively adjust the frequency and phase angle of the power grid.

[0045] In this application, the principle of improving the frequency support ability of the grid-forming device by adding a power dead zone link is as follows: First, filter out small power fluctuations and reduce ineffective regulation. In traditional grid-forming control, as long as the actual power value deviates from the power reference value , the system will adjust the frequency and phase angle. However, in actual operation, the power may have small fluctuations due to measurement noise, small grid disturbances, etc. After adding the power dead zone link, if the power deviation is within the dead zone ( ), the dead zone link outputs , and the subsequent control link will not respond to these small deviations. In this way, the frequent adjustment of the frequency and phase angle caused by small fluctuations can be avoided, and the device can maintain a constant frequency and phase angle within the dead zone range, which is equivalent to presenting an ideal voltage source characteristic externally, thereby stably supporting the grid frequency.

[0046] Second, enhance the system robustness and suppress control oscillations. Power measurement errors or short-term disturbances may cause high-frequency oscillations of the control signal. The dead zone link blocks the power deviation signal within the dead zone and prevents such oscillations from being transmitted to the subsequent control link. For example, when the power deviation is small, the dead zone output is, and the frequency will not fluctuate due to noise interference, which can effectively suppress control oscillations, improve the robustness of the system (the entire grid-forming device) to disturbances, and ensure the operation stability.

[0047] Third, clarify the ideal voltage source interval and simplify the grid interaction. Within the dead zone, the grid-forming device is equivalent to a voltage source with constant frequency and phase angle, and the interaction model between the grid and the device is simplified. The grid side does not need to deal with the frequency fluctuations caused by the small power changes of the device, and the device can also provide more stable reference frequency support for the grid. Especially in the scenario of multiple devices connected to the grid, the coordination disorder caused by frequent adjustments between devices is reduced, and the overall frequency support ability is further strengthened.

[0048] In this application, a power dead zone link is added to the grid-forming control. When the power is within the dead zone, the phase angle of the output of the grid-forming device remains unchanged, and it exhibits the characteristics of a voltage source with constant frequency and phase angle. By introducing an ideal voltage source interval, this application can effectively improve the frequency support ability and stability of the grid-forming device for the grid.

[0049] This application also provides a grid-forming control device for controlling grid-forming devices using a grid-forming control strategy. The grid-forming devices include new energy power generation devices and power electronic devices. The power electronic devices are used to connect the new energy power generation devices to the grid. The grid-forming control device includes: A power deviation value module for determining the difference between the actual power value output by the power electronic device to the grid and the power reference value; A dead zone control module for processing the power deviation value according to a preset strategy to obtain a target signal; An adjustment module for determining the phase angle of the voltage output by the power electronic device to the grid according to the target signal, and adjusting the voltage output by the power electronic device to the grid according to the phase angle; The preset strategy is as follows: Among them, represents the power deviation value, represents the target signal, represents the first threshold, represents the second threshold.

[0050] For the descriptions of the power deviation value module and the dead zone control module, reference can be made to the previous text.

[0051] In an implementation manner, the grid-forming control device may further include: A filtering module for filtering the actual power value to obtain a filtered power value; The power deviation value module is further used to determine the difference between the filtered power value and the power reference value to obtain the power deviation value.

[0052] In an implementation manner, the adjustment module includes: A proportional control module for performing an amplification operation on the target signal to obtain the first frequency of the voltage; A frequency synthesis module for determining the sum of a first frequency and a reference frequency to obtain the frequency of a voltage. A phase angle generation module for performing an integration operation on the frequency of the voltage to obtain the phase angle of the voltage.

[0053] Descriptions of the proportional control module, frequency synthesis module, and phase angle generation module can be referred to in the previous text.

[0054] In one implementation, the adjustment module includes: An inertia processing module for performing inertia processing on a target signal to obtain a second frequency of the voltage. The frequency synthesis module is further configured to determine the sum of the second frequency and the reference frequency to obtain the frequency of the voltage.

[0055] Descriptions of the inertia processing module can be referred to in the previous text.

[0056] In this application, a power dead zone link is added to the grid-forming control. When the power is within the dead zone, the phase angle of the output of the grid-forming device remains unchanged, presenting a voltage source characteristic with constant frequency and phase angle to the outside. By introducing an ideal voltage source interval, the frequency support ability and stability of the grid-forming device can be effectively improved, solving the problems in the related art.

[0057] This application also provides another grid-forming control device for controlling a grid-forming device using a grid-forming control strategy. The grid-forming device includes a new energy power generation device and a power electronic device. The power electronic device is used to connect the new energy power generation device to the grid. This grid-forming control device is as Figure 3 shown. Figure 3 It is a structural block diagram of a grid-forming control device provided by this application. Referring to Figure 3 , the grid-forming control device 300 may include: A first determination module 301 for determining the actual power value output from the power electronic device to the grid. A second determination module 302 for determining the difference between the actual power value and a power reference value to obtain a power deviation value. A processing module 303 for processing the power deviation value according to a preset strategy to obtain a target signal. A third determination module 304 for determining the phase angle of the voltage output from the power electronic device to the grid according to the target signal. An adjustment module 305 for adjusting the voltage output from the power electronic device to the grid according to the phase angle. The preset strategy is as follows: Wherein, represents the power deviation value, Represents the target signal, Represents the first threshold, Represents the second threshold.

[0058] According to a network construction control device 300 provided by the present application, the second threshold is determined in the following manner: According to the current state of the network construction device, determine the maximum active power value that the power electronic device can continuously output; Determine the difference between the maximum active power value and the power reference value as the second threshold. According to a network construction control device 300 provided by the present application, the second determination module 302 may include: A filtering sub-module for filtering the actual power value to obtain a filtered power value; A first determination sub-module for determining the difference between the filtered power value and the power reference value to obtain the power deviation value.

[0059] According to a network construction control device 300 provided by the present application, the third determination module 304 may include: A first operation sub-module for performing an amplification operation on the target signal to obtain the first frequency of the voltage; A second determination sub-module for determining the sum value of the first frequency and the reference frequency to obtain the frequency of the voltage; A second operation sub-module for performing an integration operation on the frequency of the voltage to obtain the phase angle of the voltage.

[0060] According to a network construction control device 300 provided by the present application, the third determination module 304 may include: A processing sub-module for performing an inertia processing on the target signal to obtain the second frequency of the voltage; A third determination sub-module for determining the sum value of the second frequency and the reference frequency to obtain the frequency of the voltage; A third operation sub-module for performing an integration operation on the frequency of the voltage to obtain the phase angle of the voltage.

[0061] Figure 4 Is a schematic diagram of the physical structure of an electronic device shown in an embodiment of the present application, as Figure 4As shown in the figure, the electronic device may include: a processor 410, a communications interface 420, a memory 430, and a communication bus 440. Among them, the processor 410, the communications interface 420, and the memory 430 communicate with each other through the communication bus 440. The processor 410 may call the logical instructions in the memory 430 to execute a network construction control method, and the method includes: Determine the actual power value output by the power electronic device to the power grid; 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; Determine the phase angle of the voltage output by the power electronic device to the power grid according to the target signal; Adjust the voltage output by the power electronic device to the power grid according to the phase angle; The preset strategy is as follows: Among them, represents the power deviation value, represents the target signal, represents a first threshold, represents a second threshold.

[0062] In addition, when the logical instructions in the above-mentioned memory 430 are implemented in the form of software function units and sold or used as an independent product, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of this 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 for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The foregoing storage medium includes: various media such as a USB flash drive, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk, or an optical disc that can store program codes.

[0063] On the other hand, this application also provides a computer program product. The computer program product includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the network construction control method provided by the above-mentioned various methods. The method includes: Determine the actual power value output from the power electronic device to the power grid; 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; Determine the phase angle of the voltage output from the power electronic device to the power grid according to the target signal; Adjust the voltage output from the power electronic device to the power grid according to the phase angle; The preset strategy is as follows: Wherein, represents the power deviation value, represents the target signal, represents a first threshold, represents a second threshold.

[0064] On the other hand, the present application also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it is configured to execute the network construction control method provided by the above-mentioned various methods. The method includes: determining the actual power value output from the power electronic device to the power grid; 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; Determine the phase angle of the voltage output from the power electronic device to the power grid according to the target signal; Adjust the voltage output from the power electronic device to the power grid according to the phase angle; The preset strategy is as follows: Wherein, represents the power deviation value, represents the target signal, represents a first threshold, represents a second threshold.

[0065] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0066] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the essence of the above technical solution, 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 enable a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A network control method, characterized in that: Applied to a grid-forming device adopting a grid-forming control strategy, the grid-forming device includes a new energy power generation device and a power electronic device, the power electronic device is used to connect the new energy power generation device to a power grid, and the grid-forming control method includes: Determining an actual power value outputted from the power electronic device to the power grid; Determine the difference between the actual power value and the power reference value to obtain a power deviation value; Processing the power deviation value according to a preset strategy to obtain a target signal; Determining the phase angle of the voltage output by the power electronic device to the power grid according to the target signal; adjusting the voltage output by the power electronic device to the power grid according to the phase angle; The preset strategy is as follows: in, represents the power deviation value, represents the target signal, represents the first threshold, Indicates the second threshold.

2. The network control method according to claim 1, characterized in that: The second threshold is determined according to the following method: Determining the maximum active power value that the power electronic device can sustainably output according to the current state of the network-forming device; A 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: The determining the difference between the actual power value and the power reference value to obtain a power deviation value includes: Filtering the actual power value to obtain a filtered power value; A difference between the filtered power value and the power reference value is determined to obtain the power deviation value.

4. The network control method according to claim 1, characterized in that: Determining the phase angle of the voltage output by the power electronic device to the power grid according to the target signal includes: Performing an amplification operation on the target signal to obtain a first frequency of the voltage; Determine the sum of the first frequency and a reference frequency to obtain the frequency of the voltage; An integration operation is performed on the frequency of the voltage to obtain a phase angle of the voltage.

5. The network control method according to claim 1, characterized in that: Determining the phase angle of the voltage output by the power electronic device to the power grid according to the target signal includes: Performing inertial processing on the target signal to obtain a second frequency of the voltage; Determine the sum of the second frequency and the reference frequency to obtain the frequency of the voltage; An integration operation is performed on the frequency of the voltage to obtain a phase angle of the voltage.

6. A network control device, characterized in that: Used to control a network-type device using a network-type control strategy, the network-type device includes a new energy power generation device and a power electronic device, the power electronic device is used to connect the new energy power generation device to the power grid, and the network control device includes: A power deviation value module, 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; A dead zone control module, used to process the power deviation value according to a preset strategy to obtain a target signal; an adjustment module, configured to determine a phase angle of a voltage outputted from the power electronic device to a power grid according to the target signal, and adjust the voltage outputted from the power electronic device to the power grid according to the phase angle; The preset strategy is as follows: in, represents the power deviation value, represents the target signal, represents the first threshold, Indicates the second threshold.

7. The network control device according to claim 5, characterized in that: Also includes: A filtering module, used for filtering the actual power value to obtain a filtered power value; The power deviation value module is further 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, characterized in that: The adjustment module comprises: A proportional control module performs amplification operation on the target signal to obtain a first frequency of the voltage; A frequency synthesis module, used for determining the sum of the first frequency and a reference frequency to obtain the frequency of the voltage; The phase angle generating module is used to perform an integration operation on the frequency of the voltage to obtain the phase angle of the voltage.

9. The network control device according to claim 7, characterized in that: The adjustment module also includes: an inertial processing module, used for performing inertial processing on the target signal to obtain a second frequency of the voltage; The frequency synthesis module is further used to determine the sum of the second frequency and a reference frequency to obtain the frequency of the voltage.

10. A network control device, characterized in that: Used to control a network-type device using a network-type control strategy, the network-type device includes a new energy power generation device and a power electronic device, the power electronic device is used to connect the new energy power generation device to the power grid, and the network control device includes: A first determining module, used to determine an actual power value outputted from the power electronic device to the power grid; A second determining module, configured to determine a difference between the actual power value and the power reference value to obtain a power deviation value; A processing module, used to process the power deviation value according to a preset strategy to obtain a target signal; a third determining module, configured to determine a phase angle of a voltage output by the power electronic device to a power grid according to the target signal; A regulating module, used for regulating the voltage outputted from the power electronic device to the power grid according to the phase angle; The preset strategy is as follows: in, represents the power deviation value, represents the target signal, represents the first threshold, Indicates the second threshold.

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