Network construction control method, device, equipment, medium and program product

Abstract

The invention provides a networking control method, device and equipment, a medium and a program product, and relates to the field of electric power. The virtual internal potential is generated through an intrinsic self-synchronization network construction control technology based on capacitor direct voltage under a network construction type static reactive compensation strategy; determining the synchronous phase angle of the virtual internal potential according to the actual value of the direct-current voltage of the input end of the power electronic converter and the reference value corresponding to the direct-current voltage, and determining the amplitude of the virtual internal potential according to the reactive power or voltage amplitude of the converter; and determining a three-phase virtual internal potential according to the synchronous phase angle and the amplitude of the virtual internal potential, correcting the three-phase virtual internal potential by introducing a virtual impedance switching control link to obtain a target three-phase virtual internal potential, and generating a three-phase voltage regulation instruction for the converter according to the target three-phase virtual internal potential. The converter executes the three-phase voltage adjusting instruction to adjust the output alternating voltage, and overcurrent of the converter is prevented. The invention has the advantages of simple control structure, pure voltage source characteristic and the like.

Description

Technical Field

[0001] The present application relates to the field of electric power, and in particular to a network control method, device, equipment, medium and program product. Background Art

[0002] With the advancement of the construction of new power systems, a large number of current source power electronic converters are connected to the new energy stations at the end of the power grid, which makes the power grid show the characteristics of weak voltage support capacity (the ability of the power grid to maintain voltage stability when disturbed) and low inertia (the power grid is more sensitive to disturbances), affecting the output of new energy stations and even the stable operation of the power system. At present, the commonly used solution is to connect rotating equipment-distributed phase regulators to the new energy stations, and enhance the stability of the system through the good inertia characteristics and voltage characteristics of synchronous phase regulators.

[0003] However, distributed phase condensers are expensive, complex, difficult to maintain, and difficult to select sites, making them difficult to be widely used in areas with a high proportion of new energy. Therefore, the concept of grid-type static phase condensers (Static Var Generator, SVG, also known as static VAR compensator) was proposed. Due to the limited current-carrying capacity of power electronic devices, in order to control the output current, the control algorithm of static phase condensers usually adopts the control architecture of VSG (Virtual Synchronous Generator) control outer loop + active damping + current inner loop. The control architecture is cumbersome and the parameter design is complex. The VSG control outer loop simulates the inertia characteristics and excitation characteristics of distributed phase condensers (making static phase condensers behave similarly to synchronous generators in the power grid); active damping is used to suppress the resonance that may be generated by the LCL filter (or other filters) to ensure the stable operation of the system. The current inner loop is responsible for controlling the output current to ensure that the current meets the grid demand. At the same time, since there is a current and voltage feedback link in the current inner loop, there will be a risk of high-frequency oscillation due to the delay of digital control (such as sampling delay, calculation delay, etc.), which will not only affect the stability of the system, but may also cause damage to the power grid and other equipment. Summary of the invention

[0004] The present application provides a network control method, device, equipment, medium and program product. The present application constructs a network-type SVG control algorithm with pure voltage source characteristics. During the normal steady-state operation of the power electronic converter, the network-type SVG adopts a single-loop control strategy based on the intrinsic self-synchronization of the supercapacitor voltage. The control structure is simple, no complex parameter design is required, and the traditional current inner loop is abandoned. The voltage source characteristics of the network-type SVG (the ability to stably provide a constant voltage) are guaranteed to the greatest extent, and it has a strong reactive power support capability (the ability to provide or absorb reactive power to the power grid), which can effectively solve the problems existing in the prior art.

[0005] The present application provides a network control method, the method is used to adjust the output voltage of a power electronic converter, the power electronic converter is used to convert an input DC voltage into an AC voltage and input it into a power system, the network control method includes: Under the grid-forming static VAR compensation strategy, a virtual internal potential for adjusting the output voltage of the power electronic converter is generated by an intrinsic self-synchronous grid-forming control technology based on capacitor direct pressure; Determining a synchronous phase angle of the virtual internal potential according to an actual value of a DC voltage at an input end of the power electronic converter and a reference value corresponding to the DC voltage, wherein the synchronous phase angle is used to adjust a phase of an AC voltage output by the power electronic converter; Determining the amplitude of the virtual internal potential according to the reactive power output by the power electronic converter or the voltage amplitude of the power system; Determining a three-phase virtual internal potential according to the synchronization phase angle and the amplitude of the virtual internal potential; By switching a virtual impedance algorithm, the three-phase virtual internal potential is corrected to obtain a target three-phase virtual internal potential, and a three-phase voltage regulation instruction for the AC voltage output by the power electronic converter is determined according to the target three-phase virtual internal potential; The three-phase voltage regulation instruction is sent to the power electronic converter, so that the power electronic converter executes the three-phase voltage regulation instruction to adjust the output AC voltage.

[0006] According to the network control method provided by the present application, the step of determining the synchronous phase angle of the virtual internal potential according to the actual value of the DC voltage at the input end of the power electronic converter and the reference value corresponding to the DC voltage includes: The synchronous phase angle of the virtual internal potential is determined by the following formula (1): (1) in, represents the synchronization phase angle, represents the angular velocity of the virtual synchronous machine, J represents the inertia time constant, D represents the damping coefficient, K DW represents the angular velocity proportional coefficient of the virtual synchronous machine, Represents the control proportional coefficient of the DC voltage at the input of the power electronic converter, V dc-ref The reference value of the DC voltage at the input of the power electronic converter, V dc-AVG represents the actual value of the DC voltage at the input of the power electronic converter, Represents the active power output by the power electronic converter, represents the frequency reference value, and s represents the Laplace differential operator.

[0007] According to the grid control method provided in the present application, the control proportional coefficient of the DC voltage at the input end of the power electronic converter is determined by the following formula (2): (2) in, Indicates the set value of the control proportional coefficient of the DC voltage at the input end of the power electronic converter, express and The difference, Indicates the threshold value corresponding to the angular velocity of the virtual synchronous machine, express and The threshold value corresponding to the difference between Indicates the variation of the DC voltage at the input of the power electronic converter. Indicates the threshold corresponding to the change amplitude of the DC voltage at the input end of the power electronic converter.

[0008] According to the network control method provided by the present application, the three-phase virtual internal potential is corrected by switching the virtual impedance algorithm to obtain the target three-phase virtual internal potential, and the three-phase voltage regulation instruction for the AC voltage output by the power electronic converter is determined according to the target three-phase virtual internal potential, including: If the change amplitude of the instantaneous value of the system voltage of the power system is greater than the preset voltage difference threshold, or the instantaneous value of the three-phase current output by the power electronic converter is greater than the preset current threshold, the additional voltage increment value corresponding to the internal potential of each phase in the three-phase virtual internal potential is determined according to the virtual resistance, virtual reactance and the three-phase current output by the power electronic converter in the network control method, and the additional voltage increment value is used to correct the three-phase virtual internal potential; Determine the sum of the internal potential of each phase in the three-phase virtual internal potential and the corresponding additional voltage increment value to obtain the target three-phase virtual internal potential; The target three-phase virtual internal potential is modulated by pulse width modulation technology to obtain the three-phase voltage regulation instruction.

[0009] According to the network control method provided by the present application, the additional voltage increment value corresponding to the internal potential of each phase in the three-phase virtual internal potential is determined according to the virtual resistance, virtual reactance and the three-phase current output by the power electronic converter in the network control method, including: For each phase internal potential of the three-phase virtual internal potential, the corresponding additional voltage increment value is determined by the following formula (3) according to the virtual resistance, the virtual reactance and the three-phase current output by the power electronic converter; (3) in, Indicates the additional voltage increment value, represents the virtual resistance, represents the virtual reactance, Represents the three-phase current output by the power electronic converter, represents the time constant, and s represents the Laplace differential operator.

[0010] According to the grid control method provided by the present application, the excitation control link of the grid control method supports a reactive control mode and a voltage control mode, and the AC voltage output by the power system is a three-phase positive sequence voltage; the amplitude of the virtual internal potential is determined according to the reactive power output by the power electronic converter or the system voltage amplitude of the power system, including: If the reactive power control mode is adopted in the excitation control link, the amplitude of the virtual internal potential is determined according to the actual value of the reactive power output by the power electronic converter and the reference value corresponding to the reactive power, so as to realize constant reactive power control (maintaining the actual value of reactive power consistent with the reference value); If the voltage control mode is adopted in the excitation control link, the amplitude of the virtual internal potential is determined according to the actual value of the three-phase positive-sequence voltage output by the power system and the reference value corresponding to the three-phase positive-sequence voltage, so as to realize constant voltage control (realize voltage stability control).

[0011] According to the network control method provided by the present application, determining the three-phase virtual internal potential according to the synchronization phase angle and the amplitude of the virtual internal potential includes: The three-phase virtual internal potential is determined according to the synchronous phase angle and the amplitude of the virtual internal potential by the following formula (4): (4) in, represents the synchronization phase angle, represents the magnitude of the virtual internal potential, , as well as Represents the three-phase virtual internal potential.

[0012] The present application also provides a network control device for adjusting the output voltage of a power electronic converter, wherein the power electronic converter is used to convert an input DC voltage into an AC voltage and input the AC voltage into a power grid, and the network control device includes: A generation module, used for generating a virtual internal potential for adjusting the output voltage of the power electronic converter by using an intrinsic self-synchronous grid control technology based on capacitor direct pressure under a grid-forming static VAR compensation strategy; A first determination module, configured to determine a synchronization phase angle of the virtual internal potential according to an actual value of a DC voltage at an input end of the power electronic converter and a reference value corresponding to the DC voltage, wherein the synchronization phase angle is used to adjust a phase of an AC voltage output by the power electronic converter; A second determination module is used to determine the amplitude of the virtual internal potential according to the reactive power output by the power electronic converter or the system voltage amplitude of the power system; a third determination module, configured to determine a three-phase virtual internal potential according to the synchronization phase angle and the amplitude of the virtual internal potential; a fourth determination module, configured to correct the three-phase virtual internal potential by switching a virtual impedance algorithm to obtain a target three-phase virtual internal potential, and determine a three-phase voltage regulation instruction for the AC voltage output by the power electronic converter according to the target three-phase virtual internal potential; The sending module is used to send the three-phase voltage regulation instruction to the power electronic converter, so that the power electronic converter executes the three-phase voltage regulation instruction to adjust the output AC voltage.

[0013] The present 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 when the processor executes the computer program, a network control method as described in any one of the above is implemented.

[0014] 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, a networking control method as described in any one of the above is implemented.

[0015] The present application also provides a computer program product, including a computer program, and when the computer program is executed by a processor, it implements a networking control method as described in any one of the above.

[0016] The present application provides a network control method, device, equipment, medium and program product. In the present application, a grid-type SVG control strategy (grid-type static VAR compensation strategy) is generally adopted to adjust the output voltage of the power electronic converter. First, a virtual internal potential for adjusting the output voltage of the power electronic converter is generated through an intrinsic self-synchronous grid-type control technology based on capacitor direct pressure; then, the synchronous phase angle of the virtual internal potential is determined according to the actual value of the DC voltage at the input end of the power electronic converter and the reference value corresponding to the DC voltage, and the amplitude of the virtual internal potential is determined according to the reactive power output by the power electronic converter or the voltage amplitude of the power system in which the power electronic converter is located; then, the three-phase virtual internal potential is determined according to the synchronous phase angle and the amplitude of the virtual internal potential, the three-phase virtual internal potential is corrected by a switching virtual impedance algorithm to obtain a target three-phase virtual internal potential, and a three-phase voltage regulation instruction for the AC voltage output by the power electronic converter is determined according to the target three-phase virtual internal potential, and the three-phase voltage regulation instruction is sent to the power electronic converter so that the power electronic converter executes the three-phase voltage regulation instruction to adjust the output AC voltage. The present application constructs a grid-type SVG control algorithm with pure voltage source characteristics. During the normal steady-state operation of the power electronic converter, the grid-type SVG adopts the VSG single-loop control strategy for operation. The control structure is simple, and no complex parameter design is required. The traditional current inner loop is abandoned, and the voltage source characteristics of the grid-type SVG (the ability to stably provide a constant voltage) are guaranteed to the greatest extent. It has a strong reactive power support capability (the ability to provide or absorb reactive power to the power grid), and there is no risk of high-frequency resonance within the full frequency band. At the same time, the present application adopts a virtual impedance switching algorithm, and the virtual impedance control link is put into use during the transient operation to prevent the converter from overcurrent, which can effectively solve the problems existing in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 is a flow chart of a network control method shown in an embodiment of the present application; Figure 2 is a control principle diagram of a mesh-type SVG control method shown in an embodiment of the present application; Figure 3 is a structural block diagram of a network control device shown in an embodiment of the present application; Figure 4It is a schematic diagram of the physical structure of an electronic device shown in an embodiment of the present application. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] In order to overcome the problems in the prior art, the present application provides a new grid-forming SVG control method (i.e., a grid-forming control method provided by the present application), which adopts a VSG single-loop control strategy, has a simple control structure, does not require complex parameter design, and abandons the traditional current inner loop, thereby ensuring the voltage source characteristics of the grid-forming SVG to the greatest extent and having strong reactive power support capabilities.

[0021] The execution subject of the method of the present application is a networking control device, which is essentially a control device based on a networking type SVG.

[0022] The method of the present application is used to adjust the output voltage of a power electronic converter located at the end of a power system. The power electronic converter is used to convert an input direct current voltage into an alternating current voltage and input the alternating current voltage into the power system.

[0023] Figure 1 1 is a flow chart of a network control method shown in an embodiment of the present application. Figure 1 The method of the present application may include the following steps: Step 101: Under the grid-forming static VAR compensation strategy, a virtual internal potential for adjusting the output voltage of a power electronic converter is generated by an intrinsic self-synchronous grid-forming control technology based on capacitor direct pressure.

[0024] Among them, the intrinsic self-synchronous grid control technology based on capacitor direct voltage combines the advantages of capacitor direct voltage control and grid control technology. This technology realizes the self-synchronous control of the power electronic converter by using the DC voltage of the capacitor as an intrinsic reference. The capacitor has the function of storing energy and stabilizing voltage. The DC voltage control of the capacitor refers to providing a stable energy source for the power electronic converter by accurately controlling the DC voltage of the capacitor. Based on the reference of the DC voltage of the capacitor, the power electronic converter can realize self-synchronous control, that is, the power electronic converter does not need to rely on the phase information of the external power grid, but adjusts according to its own voltage and current state to maintain synchronization with the power grid.

[0025] In this embodiment, the networking control device adopts a networking type SVG control method, and constructs a stable AC electromotive force through an intrinsic self-synchronous networking control technology based on capacitor direct pressure. It can provide delay-free synchronous reactive support when the voltage output of the power electronic converter fluctuates. The networking control device compensates for the reactive power in the power grid by controlling the AC voltage generated by its inverter.

[0026] Among them, the grid-building control method adopted by the grid-building control device is different from the traditional grid-following control method. The grid-following control method simply outputs reactive power passively following the fluctuations of the power grid, while the grid-building control method can actively provide voltage support and reactive power compensation for the power grid, thereby improving the stability and power quality of the power system.

[0027] In this embodiment, virtual synchronous machine control technology is also used when generating virtual internal potential. Virtual synchronous machine control technology is a control technology used to simulate the behavior of synchronous generators. Its core is to use inverters to simulate the operating characteristics of synchronous generators. Traditional synchronous generators rely on mechanical motion and electromagnetic induction to generate electrical energy, while virtual synchronous machine control technology simulates these characteristics through power electronic equipment. Through precise control algorithms, stable control of the frequency and voltage of the power system can be achieved, thereby improving the stability and reliability of the entire power system.

[0028] Step 102: Determine a synchronous phase angle of a virtual internal potential according to an actual value of a DC voltage at an input end of the power electronic converter and a reference value corresponding to the DC voltage. The synchronous phase angle is used to adjust a phase of an AC voltage output by the power electronic converter.

[0029] Figure 2 FIG. 1 is a control principle diagram of a meshed SVG control method shown in an embodiment of the present application. Figure 2 In the figure, the part in the upper box represents the main circuit where the converter is located, and the part in the lower box represents the network control device of this application. The part on the left of the bridge arm reactance is the power electronic converter, which converts the DC voltage output by the new energy station into AC voltage and inputs it into the power grid (a channel for transmitting electric energy) through the 35KV bus. In this application, the power electronic converter outputs a three-phase voltage. Indicates the three-phase voltage, / / Indicates three-phase current. represents the resistance in the power grid, represents the reactance in the power grid, / / Indicates the current in the power grid. The assessment point is used to monitor the current, voltage and other data in the power grid. The control logic inside the network control device is as follows: Figure 2The control part (including active power control outer loop, reactive power control outer loop, emergency current limiting measures, pulse width modulation PWM) is shown in the figure.

[0030] Reference Figure 2 In the active control link (power synchronization control link), in one implementation, step 102 may include: The synchronous phase angle of the virtual internal potential is determined by the following formula:

[0031] in, represents the synchronization phase angle, represents the angular velocity of the virtual synchronous machine, J represents the inertia time constant, D represents the damping coefficient, K DW represents the angular velocity proportional coefficient of the virtual synchronous machine, Represents the control proportional coefficient of the DC voltage at the input of the power electronic converter, V dc-ref The reference value of the DC voltage at the input of the power electronic converter, V dc-AVG represents the actual value of the DC voltage at the input of the power electronic converter, Represents the active power output by the power electronic converter, represents the frequency reference value, and s represents the Laplace differential operator.

[0032] The virtual synchronous machine can be understood as a virtual synchronous generator simulated by virtual synchronous machine control technology.

[0033] In this embodiment, in order to ensure that the power electronic converter outputs as much active power as possible, the control proportional coefficient K of the DC voltage at the input end of the power electronic converter is v The actual value of the DC voltage at the input of the power electronic converter and the angular velocity of the virtual synchronous machine can be used to calculate the Make adjustments.

[0034] Specifically, the control proportionality coefficient It can be determined by the following formula:

[0035] in, Indicates the set value of the control proportional coefficient of the DC voltage at the input end of the power electronic converter, express and The difference, Indicates the threshold value corresponding to the angular velocity of the virtual synchronous machine, express and The threshold value corresponding to the difference between Indicates the variation of the DC voltage at the input of the power electronic converter. Indicates the threshold corresponding to the change amplitude of the DC voltage at the input end of the power electronic converter.

[0036] In this embodiment, when When this condition occurs, it is believed that the power electronic converter needs more active power support. At this time, the control of the DC voltage of the power electronic converter takes effect, and K v The value is , thereby controlling the DC voltage at the input end of the power electronic converter to the set value.

[0037] When satisfied When this condition is met, it is believed that the power electronic converter needs more active power support, and at the same time, the DC voltage at the input end of the power electronic converter still has margin. At this time, the control of the DC voltage of the power electronic converter fails, and the active power based on inertia support is allowed to be output as much as possible. The power electronic converter will output as much active power as possible to support the stable operation of the power grid. Among them, inertia support refers to the virtual synchronous machine simulating the rotational inertia characteristics of traditional synchronous generators. Active power output as much as possible means that when the power electronic converter meets specific conditions, it breaks through the conventional control restrictions and outputs active power at the maximum capacity of the equipment.

[0038] When neither satisfied Not satisfied When the power electronic converter needs active power support, the DC voltage at the input end is already high and needs to be controlled to avoid overvoltage and undervoltage. At this time, the control of the DC voltage of the power electronic converter takes effect again, and the DC voltage at the input end of the power electronic converter is controlled to a preset threshold. A nearby interval ( ± ) to maintain voltage stability and system safety, where: It can be set according to actual needs.

[0039] Step 103: Determine the amplitude of the virtual internal potential according to the reactive power output by the power electronic converter or the system voltage amplitude of the power system.

[0040] In this embodiment, the virtual excitation control link includes two control links: a reactive power control closed loop and a voltage control closed loop, that is, the excitation control link of the network control method supports reactive power control mode and voltage control mode, the AC voltage output by the power electronic converter is a three-phase positive sequence voltage, and the AC voltage output by the power system is a three-phase positive sequence voltage.

[0041] Accordingly, refer to Figure 2 In the reactive power control outer loop, step 103 may include: Step 1031: If the reactive power control mode is adopted in the excitation control link, the amplitude of the virtual internal potential is determined according to the actual value of the reactive power output by the power electronic converter and the reference value corresponding to the reactive power; Step 1032: If the voltage control mode is adopted in the excitation control link, the amplitude of the virtual internal potential is determined according to the actual value of the three-phase positive sequence voltage output by the power system and the reference value corresponding to the three-phase positive sequence voltage.

[0042] In this embodiment, it is determined in advance whether to adopt the reactive power control mode or the voltage control mode in the virtual excitation control link according to the voltage range in which the AC voltage output by the power electronic converter is located. In other words, if the AC voltage output by the power electronic converter is in voltage range 1, the reactive power control mode is adopted, and if the AC voltage output by the power electronic converter is in voltage range 2, the voltage control mode is adopted, and the voltage range 1 is different from the voltage range 2. The voltage range 1 and the voltage range 2 can be set according to actual needs.

[0043] Specifically, refer to Figure 2 If the reactive power control mode is adopted in the excitation control link, then the amplitude of the virtual internal potential If the voltage control mode is adopted in the excitation control link, then the amplitude of the virtual internal potential ,in, is the reactive power control integral coefficient, is the reactive power control proportional coefficient, s represents the Laplace differential operator, Indicates the reference value corresponding to the reactive power output by the power electronic converter, Indicates the actual value of the reactive power output by the power electronic converter, Indicates the rated voltage effective value, is the reactive voltage conversion coefficient, It represents the reference value corresponding to the three-phase positive sequence voltage output by the power electronic converter. Indicates the actual value of the three-phase positive sequence voltage output by the power electronic converter.

[0044] Step 104: Determine the three-phase virtual internal potential according to the synchronous phase angle and the amplitude of the virtual internal potential. Figure 2 In one implementation, step 104 may include: The three-phase virtual internal potential is determined according to the synchronous phase angle and the amplitude of the virtual internal potential by the following formula;

[0045] in, represents the synchronization phase angle, represents the magnitude of the virtual internal potential, , as well as Represents the three-phase virtual internal potential.

[0046] In this embodiment, the three-phase potential refers to the potential generated by a power source consisting of three alternating current potentials (in this application, the potential in a virtual synchronous machine) with the same frequency, equal amplitude, and phase difference of 120°.

[0047] Step 105: Correct the three-phase virtual internal potential by switching the virtual impedance algorithm to obtain a target three-phase virtual internal potential, and determine a three-phase voltage regulation instruction for the AC voltage output by the power electronic converter according to the target three-phase virtual internal potential.

[0048] Specifically, step 105 may include: If the change amplitude of the instantaneous value of the system voltage of the power system is greater than the preset voltage difference threshold, or the instantaneous value of the three-phase current output by the power electronic converter is greater than the preset current threshold, the additional voltage increment value corresponding to the internal potential of each phase in the three-phase virtual internal potential is determined according to the virtual resistance, virtual reactance and the three-phase current output by the power electronic converter in the network control method, and the additional voltage increment value is used to correct the three-phase virtual internal potential; Determine the sum of the internal potential of each phase in the three-phase virtual internal potential and the corresponding additional voltage increment value to obtain the target three-phase virtual internal potential; The target three-phase virtual internal potential is modulated by pulse width modulation technology to obtain a three-phase voltage regulation instruction.

[0049] Among them, pulse width modulation (PWM) technology refers to the technology of simulating or adjusting the value of an analog signal by changing the duty cycle of a pulse signal (i.e., the ratio of pulse width to pulse period). The basic idea of ​​pulse width modulation technology is to convert the required analog signal into a series of pulse signals whose widths vary with the size of the analog signal, but their frequencies remain unchanged. For specific information about pulse width modulation technology, please refer to the description in the existing technology.

[0050] Among them, determining the additional voltage increment value corresponding to each phase potential in the three-phase virtual internal potential according to the virtual resistance, virtual reactance and the three-phase current output by the power electronic converter in the network control method may include: For each phase internal potential in the three-phase virtual internal potential, the corresponding additional voltage increment value is determined by the following formula according to the virtual resistance, virtual reactance and the three-phase current output by the power electronic converter;

[0051] in, Indicates the additional voltage increment value, represents the virtual resistance, represents the virtual reactance, Represents the three-phase current output by the power electronic converter, represents the time constant, and s represents the Laplace differential operator.

[0052] In this application, the control strategy of the network control device also includes emergency current limiting control measures, such as Figure 2 In a specific implementation, once it is detected that the change amplitude ΔU (usually a decrease amplitude) of the instantaneous value of the system voltage of the power system is greater than the preset voltage difference threshold ΔU th , or the instantaneous value of the three-phase current output by the power electronic converter is greater than the preset current threshold I max , take emergency current limiting control measures immediately. When it is detected that the change amplitude of the instantaneous value of the system voltage ΔU is less than or equal to the set threshold ΔU th -U zone (U zone When the instantaneous value of the three-phase current is less than or equal to the preset current threshold value I max , exit the emergency current limiting control measures.

[0053] In this embodiment, the virtual resistor It is mainly used to limit the transient current peak and speed up the transient transition process. The main control strategy is fast-input and slow-out. That is, only at the moment of implementing emergency current limiting measures Works and lasts for a while , and then exit smoothly at a certain slope, the virtual resistance The control logic is as follows:

[0054] In the above formula, the Represents the virtual resistance at the current moment, the Represents the virtual resistance expected at the next moment.

[0055] Virtual resistance The specific value of is determined by the following formula:

[0056] in, is the virtual time constant, is the per unit value of the bridge arm reactance, and the virtual time constant is usually selected to be 10~20ms.

[0057] Virtual Reactance The specific value of is determined by the following formula:

[0058] in, is the preset current threshold corresponding to the instantaneous value of the three-phase current output by the power electronic converter, It is the setting value of three-phase positive sequence voltage.

[0059] During the emergency current limiting control process, the amplitude E of the virtual internal potential is selected to lock the amplitude of the virtual synchronous machine internal potential to 1.0pu, ensuring that the network control device has ideal voltage source characteristics during the fault, and has transient overvoltage suppression characteristics when the fault is restored, avoiding unnecessary mode switching that causes system instability.

[0060] Among them, the change amplitude ΔU of the instantaneous value of the system voltage is determined by the following formula:

[0061] in, express Shaft positive sequence voltage, express Shaft positive sequence voltage.

[0062] The additional voltage increment values ​​corresponding to the internal potential of each phase in the three-phase virtual internal potential include , as well as .

[0063]

[0064]

[0065]

[0066] Among them, the three-phase current output by the power electronic converter include , as well as .

[0067] In determining , , , , , Afterwards, the target three-phase virtual internal potential is determined by the following formula:

[0068] Then, the target three-phase virtual internal potential is modulated by pulse width modulation technology to obtain a three-phase voltage regulation instruction. After the power electronic converter executes the three-phase voltage regulation instruction, , , Outputs AC voltage.

[0069] In this embodiment, if no emergency current limiting measures are taken, the target three-phase virtual internal potential is as follows:

[0070] In this embodiment, a short-circuit fault is detected within 5ms of a fault occurring in the power electronic converter and a virtual impedance link is put into use for current limiting, thereby ensuring that the power electronic converter does not over-current at the moment of the fault, and outputting the maximum reactive current within 10ms of the short-circuit fault to support the power grid, thereby ensuring the stable operation of the power grid.

[0071] Step 106: Send a three-phase voltage regulation instruction to the power electronic converter, so that the power electronic converter executes the three-phase voltage regulation instruction to adjust the output AC voltage.

[0072] In this embodiment, the three-phase voltage regulation instruction is essentially a switch instruction. After receiving the three-phase voltage regulation instruction, the power electronic converter in the new energy station executes the three-phase voltage regulation instruction, adjusts the output AC voltage, and transmits the adjusted AC voltage to the power grid, which helps to maintain the stable operation of the power grid. Through the adjustment of the power electronic converter, the compatibility and stability of new energy power generation and the power grid can be ensured.

[0073] The present application constructs a grid-type SVG control algorithm with pure voltage source characteristics. During the normal steady-state operation of the power electronic converter, the grid-type SVG control method adopts the VSG single-loop control strategy. The control structure is simple, and no complex parameter design is required. The traditional current inner loop is abandoned, and the voltage source characteristics of the grid-type SVG (the ability to stably provide a constant voltage) are guaranteed to the greatest extent. It has a strong reactive power support capability (the ability to provide or absorb reactive power to the power grid), which can effectively solve the problems existing in the prior art.

[0074] The pure voltage source characteristic grid-type SVG control method in this application can be applied to various types of power electronic converter topologies, namely Figure 2 The topology of the main circuit includes but is not limited to the three-level topology and the high-voltage cascade topology. This application combines the intrinsic self-synchronous networking control technology based on capacitor direct pressure, the virtual impedance technology and the virtual impedance switching logic, abandons the traditional current inner loop, and guarantees the voltage source characteristics of the networking control device to the greatest extent, so that the networking control device can release its support capabilities in voltage and frequency to the greatest extent while ensuring that there is no overcurrent.

[0075] Due to the passive characteristics of the meshed SVG, the present application adds a control link for the DC voltage at the input end of the power electronic converter to the synchronization ring, generates active power instructions through this control link, connects to the traditional VSG control link to realize synchronous control based on capacitor voltage, and combines with the reactive excitation link to form the VSG control outer loop.

[0076] In order to ensure that the grid-type SVG converter does not overcurrent, this application adds a switchable virtual impedance control algorithm. Under the condition of stable operation of the power electronic converter, the single VSG control loop is guaranteed to operate; in the case of high voltage or low voltage faults in the system (power electronic converter), the system fault is quickly detected and the current limiting virtual impedance control link is activated. At the moment of the fault, the virtual inductance and transient virtual resistance are increased to accelerate the transient transition process and reduce the transient current amplitude; subsequently, during the high and low wear period, the transient virtual resistance is flexibly withdrawn, and the virtual inductance is activated for steady-state current limiting; after the high and low wear faults are restored, the virtual inductance is withdrawn, and the grid control device is restored to a stable operating state.

[0077] In summary, the present application adopts a network-type SVG control strategy as a whole to adjust the output voltage of the power electronic converter. First, the power electronic converter determines the synchronous phase angle of the potential inside the virtual synchronous machine according to the actual value of the DC voltage at the input end of the power electronic converter and the reference value corresponding to the DC voltage, and determines the amplitude of the potential inside the virtual synchronous machine according to the reactive power output of the power electronic converter or the system voltage amplitude of the power system; then, according to the synchronous phase angle and the amplitude of the potential, the three-phase voltage modulation instruction for the AC voltage output by the power electronic converter is determined; at the same time, in order to prevent the transient overcurrent of the network equipment, the virtual impedance link is switched in real time according to the voltage change and current amplitude; the virtual impedance link generates a three-phase AC voltage modulation instruction increment after the measured current passes through the virtual resistance and virtual inductance links, and is output after being superimposed on the three-phase voltage modulation instruction after being put into operation. Finally, a three-phase voltage adjustment instruction is sent to the power electronic converter, so that the power electronic converter executes the three-phase voltage adjustment instruction to adjust the output AC voltage. The present application constructs a grid-type SVG control algorithm with pure voltage source characteristics. During the normal steady-state operation of the power electronic converter, the grid-type SVG adopts the VSG single-loop control strategy for operation. During the fault transient operation, current limiting control is performed through the flexible switching of virtual impedance. The control structure is simple, and no complex parameter design is required. The traditional current inner loop is abandoned, and the voltage source characteristics of the grid-type SVG (the ability to stably provide a constant voltage) are guaranteed to the greatest extent. It has a strong reactive power support capability (the ability to provide or absorb reactive power to the power grid), and there is no risk of high-frequency resonance within the full frequency band, which can effectively solve the problems existing in the prior art.

[0078] A networking control device provided in the present application is described below. The networking control device described below and the networking control method described above can refer to each other.

[0079] The grid control device of the present application is used to adjust the output voltage of the power electronic converter, and the power electronic converter is used to convert the input DC voltage into AC voltage and input it into the power grid.

[0080] Figure 3 1 is a structural block diagram of a network control device shown in an embodiment of the present application. Figure 3 , the network control device 300 of the present application may include: A generating module 301 is used to generate a virtual internal potential for adjusting the output voltage of the power electronic converter by using an intrinsic self-synchronous grid control technology based on capacitor direct pressure under a grid-forming static VAR compensation strategy; A first determination module 302, configured to determine a synchronization phase angle of the virtual internal potential according to an actual value of a DC voltage at an input end of the power electronic converter and a reference value corresponding to the DC voltage, wherein the synchronization phase angle is used to adjust a phase of an AC voltage output by the power electronic converter; A second determination module 303 is used to determine the amplitude of the virtual internal potential according to the reactive power output by the power electronic converter or the system voltage amplitude of the power system; A third determination module 304 is used to determine the three-phase virtual internal potential according to the synchronization phase angle and the amplitude of the virtual internal potential; The fourth determination module 305 is used to correct the three-phase virtual internal potential by switching the virtual impedance algorithm to obtain the target three-phase virtual internal potential, and determine the three-phase voltage regulation instruction for the AC voltage output by the power electronic converter according to the target three-phase virtual internal potential; The sending module 306 is used to send the three-phase voltage adjustment instruction to the power electronic converter, so that the power electronic converter executes the three-phase voltage adjustment instruction to adjust the output AC voltage.

[0081] According to a networking control device 300 provided by the present application, the first determining module 302 includes: The first determination submodule is used to determine the synchronization phase angle of the virtual internal potential by the following formula (1): (1) in, represents the synchronization phase angle, represents the angular velocity of the virtual synchronous machine, J represents the inertia time constant, D represents the damping coefficient, K DW represents the angular velocity proportional coefficient of the virtual synchronous machine, Represents the control proportional coefficient of the DC voltage at the input of the power electronic converter, V dc-ref The reference value of the DC voltage at the input of the power electronic converter, V dc-AVG represents the actual value of the DC voltage at the input of the power electronic converter, Represents the active power output by the power electronic converter, represents the frequency reference value, and s represents the Laplace differential operator.

[0082] According to a network control device 300 provided by the present application, the control proportional coefficient of the DC voltage at the input end of the power electronic converter is determined by the following formula (2): (2) in, Indicates the set value of the control proportional coefficient of the DC voltage at the input end of the power electronic converter, express and The difference, Indicates the threshold value corresponding to the angular velocity of the virtual synchronous machine, express and The threshold value corresponding to the difference between Indicates the variation of the DC voltage at the input of the power electronic converter. Indicates the threshold corresponding to the change amplitude of the DC voltage at the input end of the power electronic converter.

[0083] According to a networking control device 300 provided by the present application, the fourth determination module 305 includes: A second determination submodule is used to determine, if the change amplitude of the instantaneous value of the system voltage of the power system is greater than a preset voltage difference threshold, or the instantaneous value of the three-phase current output by the power electronic converter is greater than a preset current threshold, according to the virtual resistance, virtual reactance and the three-phase current output by the power electronic converter in the network control method, an additional voltage increment value corresponding to the internal potential of each phase in the three-phase virtual internal potential, and the additional voltage increment value is used to correct the three-phase virtual internal potential; A third determination submodule is used to determine the sum of the internal potential of each phase in the three-phase virtual internal potential and the corresponding additional voltage increment value to obtain the target three-phase virtual internal potential; The modulation submodule is used to modulate the target three-phase virtual internal potential through pulse width modulation technology to obtain the three-phase voltage regulation instruction.

[0084] According to a networking control device 300 provided by the present application, the second determining submodule includes: For each phase internal potential of the three-phase virtual internal potential, the corresponding additional voltage increment value is determined by the following formula (3) according to the virtual resistance, the virtual reactance and the three-phase current output by the power electronic converter; (3) in, Indicates the additional voltage increment value, represents the virtual resistance, represents the virtual reactance, Represents the three-phase current output by the power electronic converter, represents the time constant, and s represents the Laplace differential operator.

[0085] According to a networking control device 300 provided by the present application, the second determination module 303 includes: A fourth determination submodule is used to determine the amplitude of the virtual internal potential according to the actual value of the reactive power output by the power electronic converter and the reference value corresponding to the reactive power if the reactive control mode is adopted in the excitation control link; The fifth determination submodule is used to determine the amplitude of the virtual internal potential according to the actual value of the three-phase positive-sequence voltage output by the power system and the reference value corresponding to the three-phase positive-sequence voltage if the voltage control mode is adopted in the excitation control link.

[0086] According to a networking control device 300 provided by the present application, the third determination module 304 includes: The sixth determination submodule is used to determine the three-phase virtual internal potential according to the synchronous phase angle and the amplitude of the virtual internal potential through the following formula (4): (4) in, represents the synchronization phase angle, represents the magnitude of the virtual internal potential, , as well as Represents the three-phase virtual internal potential. Figure 4 is a schematic diagram of the physical structure of an electronic device shown in an embodiment of the present application, such as Figure 4 As shown, the electronic device may include: a processor 410, a communication interface 420, a memory 430 and a communication bus 440, wherein the processor 410, the communication interface 420, and the memory 430 communicate with each other through the communication bus 440. The processor 410 may call the logic instructions in the memory 430 to execute a network control method, which includes: Under the grid-forming static VAR compensation strategy, a virtual internal potential for adjusting the output voltage of the power electronic converter is generated by an intrinsic self-synchronous grid-forming control technology based on capacitor direct pressure; Determining a synchronous phase angle of the virtual internal potential according to an actual value of a DC voltage at an input end of the power electronic converter and a reference value corresponding to the DC voltage, wherein the synchronous phase angle is used to adjust a phase of an AC voltage output by the power electronic converter; Determining the amplitude of the virtual internal potential according to the reactive power output by the power electronic converter or the system voltage amplitude of the power system; Determining a three-phase virtual internal potential according to the synchronization phase angle and the amplitude of the virtual internal potential; By switching a virtual impedance algorithm, the three-phase virtual internal potential is corrected to obtain a target three-phase virtual internal potential, and a three-phase voltage regulation instruction for the AC voltage output by the power electronic converter is determined according to the target three-phase virtual internal potential; The three-phase voltage regulation instruction is sent to the power electronic converter, so that the power electronic converter executes the three-phase voltage regulation instruction to adjust the output AC voltage.

[0087] In addition, the logic instructions in the above-mentioned memory 430 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0088] On the other hand, the present 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, and when the computer program is executed by a processor, the computer can execute a networking control method provided by the above methods, the method including: Under the grid-forming static VAR compensation strategy, a virtual internal potential for adjusting the output voltage of the power electronic converter is generated by an intrinsic self-synchronous grid-forming control technology based on capacitor direct pressure; Determining a synchronous phase angle of the virtual internal potential according to an actual value of a DC voltage at an input end of the power electronic converter and a reference value corresponding to the DC voltage, wherein the synchronous phase angle is used to adjust a phase of an AC voltage output by the power electronic converter; Determining the amplitude of the virtual internal potential according to the reactive power output by the power electronic converter or the system voltage amplitude of the power system; Determining a three-phase virtual internal potential according to the synchronization phase angle and the amplitude of the virtual internal potential; By switching a virtual impedance algorithm, the three-phase virtual internal potential is corrected to obtain a target three-phase virtual internal potential, and a three-phase voltage regulation instruction for the AC voltage output by the power electronic converter is determined according to the target three-phase virtual internal potential; The three-phase voltage regulation instruction is sent to the power electronic converter, so that the power electronic converter executes the three-phase voltage regulation instruction to adjust the output AC voltage.

[0089] On the other hand, the present application also provides a non-transitory computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, a networking control method provided by the above methods is implemented, the method comprising: Under the grid-forming static VAR compensation strategy, a virtual internal potential for adjusting the output voltage of the power electronic converter is generated by an intrinsic self-synchronous grid-forming control technology based on capacitor direct pressure; Determining a synchronous phase angle of the virtual internal potential according to an actual value of a DC voltage at an input end of the power electronic converter and a reference value corresponding to the DC voltage, wherein the synchronous phase angle is used to adjust a phase of an AC voltage output by the power electronic converter; Determining the amplitude of the virtual internal potential according to the reactive power output by the power electronic converter or the system voltage amplitude of the power system; Determining a three-phase virtual internal potential according to the synchronization phase angle and the amplitude of the virtual internal potential; By switching a virtual impedance algorithm, the three-phase virtual internal potential is corrected to obtain a target three-phase virtual internal potential, and a three-phase voltage regulation instruction for the AC voltage output by the power electronic converter is determined according to the target three-phase virtual internal potential; The three-phase voltage regulation instruction is sent to the power electronic converter, so that the power electronic converter executes the three-phase voltage regulation instruction to adjust the output AC voltage. The device embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without creative work.

[0090] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0091] 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 it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions 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: The method is used to adjust the output voltage of the power electronic converter, wherein the power electronic converter is used to convert the input DC voltage into AC voltage and input it into the power system. The network control method includes: Under the grid-forming static VAR compensation strategy, a virtual internal potential for adjusting the output voltage of the power electronic converter is generated by an intrinsic self-synchronous grid-forming control technology based on capacitor direct pressure; Determining a synchronous phase angle of the virtual internal potential according to an actual value of a DC voltage at an input end of the power electronic converter and a reference value corresponding to the DC voltage, wherein the synchronous phase angle is used to adjust a phase of an AC voltage output by the power electronic converter; Determining the amplitude of the virtual internal potential according to the reactive power output by the power electronic converter or the voltage amplitude of the power system; Determining a three-phase virtual internal potential according to the synchronization phase angle and the amplitude of the virtual internal potential; By switching a virtual impedance algorithm, the three-phase virtual internal potential is corrected to obtain a target three-phase virtual internal potential, and a three-phase voltage regulation instruction for the AC voltage output by the power electronic converter is determined according to the target three-phase virtual internal potential; The three-phase voltage regulation instruction is sent to the power electronic converter, so that the power electronic converter executes the three-phase voltage regulation instruction to adjust the output AC voltage.

2. The network control method according to claim 1, characterized in that: The step of determining the synchronous phase angle of the virtual internal potential according to the actual value of the DC voltage at the input end of the power electronic converter and a reference value corresponding to the DC voltage comprises: The synchronous phase angle of the virtual internal potential is determined by the following formula (1): （1） in, represents the synchronization phase angle, represents the angular velocity of the virtual synchronous machine, J represents the inertia time constant, D represents the damping coefficient, K DW represents the angular velocity proportional coefficient of the virtual synchronous machine, Represents the control proportional coefficient of the DC voltage at the input of the power electronic converter, V dc-ref The reference value of the DC voltage at the input of the power electronic converter, V dc-AVG represents the actual value of the DC voltage at the input of the power electronic converter, Represents the active power output by the power electronic converter, represents the frequency reference value, s represents the Laplace differential operator, is the integral symbol.

3. The network control method according to claim 2, characterized in that: The control proportional coefficient of the DC voltage at the input end of the power electronic converter is determined by the following formula (2): （2） in, Indicates the set value of the control proportional coefficient of the DC voltage at the input end of the power electronic converter, express and The difference, Indicates the threshold value corresponding to the angular velocity of the virtual synchronous machine, express and The threshold value corresponding to the difference between Indicates the variation of the DC voltage at the input of the power electronic converter. Indicates the threshold corresponding to the change amplitude of the DC voltage at the input end of the power electronic converter.

4. The network control method according to claim 1, characterized in that: The three-phase virtual internal potential is corrected by switching the virtual impedance algorithm to obtain a target three-phase virtual internal potential, and a three-phase voltage regulation instruction for the AC voltage output by the power electronic converter is determined according to the target three-phase virtual internal potential, including: If the change amplitude of the instantaneous value of the system voltage of the power system is greater than the preset voltage difference threshold, or the instantaneous value of the three-phase current output by the power electronic converter is greater than the preset current threshold, the additional voltage increment value corresponding to the internal potential of each phase in the three-phase virtual internal potential is determined according to the virtual resistance, virtual reactance and the three-phase current output by the power electronic converter in the network control method, and the additional voltage increment value is used to correct the three-phase virtual internal potential; Determine the sum of the internal potential of each phase in the three-phase virtual internal potential and the corresponding additional voltage increment value to obtain the target three-phase virtual internal potential; The target three-phase virtual internal potential is modulated by pulse width modulation technology to obtain the three-phase voltage regulation instruction.

5. The network control method according to claim 4, characterized in that: The method of determining the additional voltage increment value corresponding to the internal potential of each phase in the three-phase virtual internal potential according to the virtual resistance, virtual reactance and the three-phase current output by the power electronic converter in the network control method includes: For each phase internal potential of the three-phase virtual internal potential, the corresponding additional voltage increment value is determined by the following formula (3) according to the virtual resistance, the virtual reactance and the three-phase current output by the power electronic converter; （3） in, Indicates the additional voltage increment value, represents the virtual resistance, represents the virtual reactance, Represents the three-phase current output by the power electronic converter, represents the time constant, and s represents the Laplace differential operator.

6. The network control method according to claim 1, characterized in that: The excitation control link of the grid control method supports a reactive control mode and a voltage control mode, and the AC voltage output by the power system is a three-phase positive sequence voltage; the amplitude of the virtual internal potential is determined according to the reactive power output by the power electronic converter or the voltage amplitude of the power system, including: If the reactive power control mode is adopted in the excitation control link, the amplitude of the virtual internal potential is determined according to the actual value of the reactive power output by the power electronic converter and the reference value corresponding to the reactive power; If the voltage control mode is adopted in the excitation control link, the amplitude of the virtual internal potential is determined according to the actual value of the three-phase positive-sequence voltage output by the power system and the reference value corresponding to the three-phase positive-sequence voltage.

7. The network control method according to claim 1, characterized in that: Determining the three-phase virtual internal potential according to the synchronization phase angle and the amplitude of the virtual internal potential includes: The three-phase virtual internal potential is determined according to the synchronous phase angle and the amplitude of the virtual internal potential by the following formula (4): （4） in, represents the synchronization phase angle, represents the magnitude of the virtual internal potential, , as well as Represents the three-phase virtual internal potential.

8. A network control device, characterized in that: Used to adjust the output voltage of the power electronic converter, the power electronic converter is used to convert the input DC voltage into AC voltage and input it into the power system, the network control device includes: A generation module, used for generating a virtual internal potential for adjusting the output voltage of the power electronic converter by using an intrinsic self-synchronous grid control technology based on capacitor direct pressure under a grid-forming static VAR compensation strategy; A first determination module, configured to determine a synchronization phase angle of the virtual internal potential according to an actual value of a DC voltage at an input end of the power electronic converter and a reference value corresponding to the DC voltage, wherein the synchronization phase angle is used to adjust a phase of an AC voltage output by the power electronic converter; A second determination module is used to determine the amplitude of the virtual internal potential according to the reactive power output by the power electronic converter or the voltage amplitude of the power system; a third determination module, configured to determine a three-phase virtual internal potential according to the synchronization phase angle and the amplitude of the virtual internal potential; a fourth determination module, configured to correct the three-phase virtual internal potential by switching a virtual impedance algorithm to obtain a target three-phase virtual internal potential, and determine a three-phase voltage regulation instruction for the AC voltage output by the power electronic converter according to the target three-phase virtual internal potential; The sending module is used to send the three-phase voltage regulation instruction to the power electronic converter, so that the power electronic converter executes the three-phase voltage regulation instruction to adjust the output AC voltage.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, the network control method as described in any one of claims 1 to 7 is implemented.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, a networking control method as described in any one of claims 1 to 7 is implemented.

11. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, a networking control method as described in any one of claims 1 to 7 is implemented.

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