Self-adaptive power-voltage cooperative fault ride-through control method for network-constructed converter

Abstract

The invention discloses a self-adaptive power-voltage cooperative fault ride-through control method of a network-constructed converter, and belongs to the technical field of fault ride-through control of network-constructed converters. Comprising the following steps: monitoring a power grid voltage and a grid-connected point voltage in real time, and dynamically correcting an active power reference value according to a voltage drop degree when detecting that the power grid voltage drops below 0.9 times of a rated value; calculating a voltage reference value capable of limiting a fault current steady-state component within a safe range in real time by solving a voltage-current relation equation according to a power grid voltage drop degree and a preset current limit value requirement; and when it is detected that the output current of the converter exceeds a set threshold value, adaptive virtual impedance in direct proportion to the overcurrent degree is adopted, and transient impact current is suppressed. According to the three control steps, starting opportunities are independently judged based on different fault characteristic quantities, and complementary cooperation on the time scale is formed in the fault ride-through process; and the stable operation guarantee of the whole process from fault generation to elimination is cooperatively realized.

Description

Technical Field

[0001] This invention belongs to the field of fault ride-through control technology for grid-connected converters, specifically relating to an adaptive power-voltage coordinated fault ride-through control method for grid-connected converters. Background Technology

[0002] Grid-connected converters suffer from overcurrent and transient power angle instability when grid voltage drops. Existing fault ride-through control schemes for grid-connected converters, such as control mode switching, current reference value limiting, and virtual impedance methods, all have shortcomings. (1) Control mode switching method: When an overcurrent is detected, the converter is switched from grid-based control to grid-following control. Although this method can achieve current control, it causes the converter to lose its grid-based function during the fault period and cannot provide voltage and frequency support to the grid, which violates the core advantage of grid-based converters. In addition, under weak grid conditions, the phase-locked loop that is relied upon after the switch is prone to synchronization stability problems.

[0003] (2) Current reference value limiting method: During the fault, the reference value of the inner current loop is directly limited to achieve current limiting. Although this method maintains the grid-type control structure, it will lead to current saturation, causing a decrease in the amplitude and phase shift of the power angle curve, reducing the maximum fault clearing angle under the condition of system instability, thereby reducing the transient stability margin and the tolerable fault duration of the system.

[0004] (3) Virtual impedance method: This method limits the fault current by simulating an increase in the output impedance of the converter. Compared with the current reference value limitation, it has less impact on the phase of the power angle curve. However, its disadvantage is that the calculation of the virtual impedance value is complex and highly dependent on the rapid and accurate measurement of grid parameters, making it difficult to adapt to different voltage drop levels in practical applications. If a constant virtual impedance is used, it will reduce the amplitude of the power angle curve if the fault persists after it has been cleared, which will have an adverse effect on transient stability. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide an adaptive power-voltage coordinated fault ride-through control method for grid-type converters, thereby solving the problems in existing technologies.

[0006] The objective of this invention can be achieved through the following technical solutions: Adaptive power-voltage coordinated fault ride-through control method for grid-type converters, including: Real-time monitoring of grid voltage and grid connection point voltage; when the grid voltage drops to below 0.9 times the rated value, the active power reference value is dynamically corrected according to the degree of voltage drop; by establishing a power balance equation during the fault, the active power reference value that can maintain a stable power angle is calculated. Based on the degree of voltage drop in the power grid and the preset current limit requirements, the voltage reference value that can limit the steady-state component of the fault current within a safe range is calculated in real time by solving the voltage-current relationship equation. When the converter output current is detected to exceed the set threshold, an adaptive virtual impedance proportional to the degree of overcurrent is used to suppress the inrush current during the transient process of fault occurrence and clearance.

[0007] Furthermore, the process of dynamically adjusting the active power reference value includes: 1) Calculate the steady-state power angle during normal operation. : in, For grid impedance, for The corresponding impedance angle, This is the active power reference power; This is the grid voltage. This refers to the voltage at the grid connection point. 2) The original power angle equation is corrected based on the voltage drop, resulting in: in, Power output under fault conditions. This is the fault voltage. This is the grid voltage. For the angle of attack; 3) Based on the voltage at the time of the fault and Correct the power equation and adjust the power angle during a fault. The adjusted active power reference value was calculated. .

[0008] Furthermore, the adjustment rule for the active power reference value is as follows: .

[0009] Furthermore, the formula for calculating the voltage reference value that can limit the steady-state component of the fault current within a safe range is as follows: in, As an auxiliary variable, This represents the steady-state component of the fault current. For current limits, The voltage reference value is the current limit.

[0010] Furthermore, the expression for the adaptive virtual impedance is: In the formula, and These are the resistance and inductance, which are virtual impedances, respectively. The fault current amplitude, and These are the fault currents corresponding to , Axial components; This is the scaling factor for the virtual impedance; This is the ratio of virtual reactance to virtual resistance. This is the current threshold.

[0011] Furthermore, the scaling factor of the virtual impedance The formula for calculation is: in, The current threshold during the fault period. The voltage reference value is the current limit.

[0012] The adaptive power-voltage coordinated fault ride-through control device for grid-type converters executes the above-mentioned control method, including: Adaptive power command generation unit: Real-time monitoring of grid voltage and grid connection point voltage. When the grid voltage drops to below 0.9 times the rated value, the active power reference value is dynamically corrected according to the degree of voltage drop. By establishing the power balance equation during the fault, the active power reference value that can maintain the power angle stability is calculated. Adaptive voltage command generation unit: Based on the degree of grid voltage drop and preset current limit requirements, it calculates in real time the voltage reference value that can limit the steady-state component of the fault current within a safe range by solving the voltage-current relationship equation. Dynamic virtual impedance control unit: When the converter output current is detected to exceed the set threshold, an adaptive virtual impedance proportional to the degree of overcurrent is used to suppress the inrush current during the transient process of fault occurrence and clearance.

[0013] A computer storage medium storing a readable program that, when executed, instructs a computing device to perform the aforementioned adaptive power-voltage coordinated fault ride-through control method for grid-connected converters.

[0014] An electronic device includes: a processor, a memory, a communication interface, and a communication bus, wherein the processor, the memory, and the communication interface communicate with each other through the communication bus; The memory is used to store at least one executable instruction that causes the processor to perform the operation corresponding to the above-described adaptive power-voltage cooperative fault ride-through control method for grid-type converters.

[0015] A computer program product includes computer instructions that instruct a computing device to perform operations corresponding to the above-described adaptive power-voltage cooperative fault ride-through control method for grid-connected converters.

[0016] The beneficial effects of this invention are: 1. The control method proposed in this invention dynamically eliminates the active power imbalance during faults through adaptive power commands, fundamentally improving power angle stability; it precisely limits the steady-state component of the fault current through adaptive voltage commands and quickly suppresses transient inrush currents by combining dynamic virtual impedance, achieving coordinated and precise management of the current throughout the fault process; the method maintains a grid-based control structure throughout the entire fault ride-through process without switching to a grid-following mode, avoiding synchronization stability risks and continuously providing voltage and frequency support to the power grid; all control commands are generated based on real-time electrical quantity measurements and are decoupled from grid impedance parameters, possessing strong robustness and engineering applicability; each control unit starts independently based on different thresholds, clearly coordinating in terms of time scale and control objectives, jointly forming an efficient and reliable collaborative control system.

[0017] 2. This invention corrects the power angle curve based on the degree of grid voltage drop and sets the adaptive active power reference value, which can effectively improve the system power angle stability, enhance the system's dynamic recovery performance, and reduce fault current to a certain extent.

[0018] 3. This invention divides the system overcurrent during a fault into two parts: a steady-state component and a transient component. For the steady-state component, the voltage reference value is adaptively adjusted according to the degree of voltage drop in the grid and the current amplitude limit requirements. For the transient component, a dynamic virtual impedance is introduced to achieve rapid suppression of the transient current. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure and control topology of the grid-connected converter grid-connected system of the present invention; Figure 2 This is a schematic diagram of the power angle curve of the VSG of the present invention, showing mild voltage drop, severe voltage drop, and improved severe voltage drop. Figure 3 This is a schematic diagram of the VSG fault-crossing control strategy of the present invention.

[0021] Figure 4 This is a schematic diagram of the simulation test results of the present invention. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1 In this embodiment, before introducing the control method, the transient response and overcurrent mechanism of the grid-connected converter during a fault are analyzed. The dynamic behavior and overcurrent generation mechanism of the grid-connected converter under grid faults are introduced, providing a theoretical basis for the design of subsequent control strategies. This analysis is based on a grid-connected converter model controlled by a virtual synchronous generator (VSG). The main circuit topology of the grid-connected converter system and its control block diagram are shown below. Figure 1 As shown, the converter is... LC The filter circuit removes high-frequency harmonics and connects to the AC power grid at the point of common coupling (PCC). (See diagram.) This refers to the DC-side voltage of the converter. , These are the filter inductor and the filter capacitor, respectively. , These are the line resistance and inductance, respectively. and These are the phase and voltage reference values, respectively. and These represent the active and reactive power delivered by the converter to the power grid, respectively.

[0024] 1) Analysis of transient work angle stability mechanism This converter employs VSG control; the active power-frequency control loop and reactive power-voltage control loop of the VSG control simulate the rotor motion equation and excitation voltage regulation process of a synchronous generator, respectively. The mathematical models for its active and reactive power control are as follows: (1) (2) in, and These represent the reference values ​​for the active power and reactive power output of the grid-connected converter, respectively. and These represent the angular frequency of the converter output and the grid angular frequency, respectively; J and D are the inertia and damping constants, respectively. is the reactive power droop factor; E is the virtual electromotive force.

[0025] The grid-connected converter and the power grid are equivalent to two voltage sources, and its output active power can be expressed as: (3) in, E and To ensure voltage equalization between the grid-connected converter and the AC grid, P This refers to the active power output of a grid-type converter.

[0026] The drawing is based on equation (3). P-δ Curves Figure 2 As shown, curves N, M, and S represent the power angle curves under three operating conditions: normal operation, slight voltage dip, and severe voltage dip, respectively. When the system is subjected to a small disturbance, it will experience acceleration and deceleration processes sequentially. The system can only remain stable when the maximum power angle achievable by the converter is less than the critical fault clearing angle. Figure 2 As shown in (a) above. When the converter is subjected to more severe disturbances, the curves do not intersect, the system is in an acceleration phase, and cannot automatically recover to normal operating conditions, as shown in (a). Figure 2 As shown in (b) of the diagram. Therefore, the fundamental cause of system transient instability is the active power imbalance driving the power angle change until it exceeds a certain threshold. During the fault, the active power reference value is dynamically adjusted according to the grid voltage drop depth to improve the dynamic change process of the system power angle. The improved power angle curve is shown in Figure 1. Figure 2 As shown in (c), the active power reference value during the fault period is set as the actual output power at point b, denoted as . At the instant of voltage drop, the system directly switches from the original stable equilibrium point a to the new equilibrium point b, which shortens the fault transient time and enhances the power angle stability of the system.

[0027] Draw according to the above formula As the curve shows, a voltage dip in the grid leads to a decrease in the amplitude of the power angle curve. When a severe voltage dip (Type II disturbance) occurs, the power angle curve deviates from the active power reference value. Without intersection points, the system continues to accelerate and loses synchronization. The fundamental cause of the system's transient instability is the change in the power angle driven by the imbalance of active power until it exceeds the stability limit. According to the equal area rule, the condition for maintaining transient stability is that the accelerating area does not exceed the maximum decelerating area. (4) The intuitive approach to improving stability is to reduce the acceleration area and increase the deceleration area. This is achieved by dynamically adjusting the voltage drop area during a fault. This can change the system's operating point to achieve the above objectives.

[0028] 2) Overcurrent characteristic analysis According to Kirchhoff's Voltage Law (KVL), the equivalent circuit equation for a grid-connected system is as follows: (5) During a fault, the output current of the VSG can be divided into a steady-state component and a transient decaying component. The amplitude of its steady-state component is determined by the following formula: (6) in, For line impedance, ， This represents the grid voltage during a fault.

[0029] As can be seen from this equation, the overcurrent during a fault is mainly caused by the approximately constant internal potential and the continuously increasing power angle. Therefore, controlling the internal potential (voltage reference value) while suppressing the increase of the power angle is the key to limiting the fault current.

[0030] An adaptive power-voltage coordinated fault ride-through control method for grid-connected converters includes the following steps: S1 monitors the grid voltage and grid connection point voltage in real time. When the grid voltage drops to below 0.9 times the rated value, the active power reference value is dynamically adjusted according to the degree of voltage drop. By establishing the power balance equation during the fault, the optimal active power reference value that can maintain the power angle stability is calculated. Based on the above analysis of the transient power angle stability mechanism, a decrease in grid voltage causes the VSG output active power to deviate from the reference value, leading to power angle instability. The basic idea of ​​this control is to adjust the power angle based on the grid voltage. and grid connection point voltage The active power reference value is dynamically adjusted to eliminate power imbalance and maintain a constant power angle during faults. The overall control block diagram of the fault-crossing control strategy is as follows: Figure 3 As shown, adaptive power-voltage command and dynamic virtual impedance control are used to limit the steady-state current component during faults and the inrush current during transient processes, respectively. When the grid voltage drops below 0.9 pu, adaptive power-voltage command control is activated, adjusting the active power reference value and voltage reference value according to the current amplitude limit requirements to limit the steady-state current component during faults. Once the output current of the grid-connected converter is detected to exceed a predefined threshold, dynamic virtual impedance is triggered.

[0031] The process of dynamically adjusting the active power reference value is as follows: First, calculate the steady-state power angle during normal operation. : (7) in, for impedance angle, For line impedance, This is a reference value for active power. This is the grid voltage. This refers to the voltage at the grid connection point. The original power angle equation is corrected based on the degree of voltage drop, resulting in: (8) in, The active power output of the grid-type converter. This refers to the grid connection point voltage during a fault. This refers to the grid voltage during a fault. For the angle of attack; Subsequently, based on the voltage at the time of the fault and Correct the power equation and adjust the power angle during a fault. The adjusted active power reference value was calculated. In summary, the active power reference value is adjusted according to the following rules: (9) This strategy significantly improves power angle stability by switching the system operating point to a new stable equilibrium point at the moment of voltage drop, ideally making the acceleration area close to zero.

[0032] S2, based on the degree of voltage drop in the power grid and the preset current limit requirements, calculates in real time the voltage reference value that can limit the steady-state component of the fault current within a safe range by solving the voltage-current relationship equation; The power angle was suppressed by adaptive adjustment of the active power command in S1. While the fault current may increase, it may still exceed the limit when the grid voltage drops significantly. This embodiment uses transient voltage control to solve this problem.

[0033] Further derivation from equation MERGEFORMAT (6) yields the amplitude of the steady-state fault current component. With voltage The relationship is as follows: (10) From the formula MERGEFORMAT (6) in the aforementioned overcurrent characteristic analysis, it can be seen that, under the condition that the degree of grid voltage drop is known and the power angle is constant, the amplitude of the steady-state component of the fault current is... With grid connection point voltage The decrease is due to the reduction in voltage. Because VSG has ideal voltage tracking performance, i.e. Therefore, the fault current can be limited by controlling the voltage reference value.

[0034] The solution can be obtained to meet the current limit requirement. voltage reference value The voltage reference value is dynamically adjusted based on: (11) in, As an auxiliary variable, For current limits, The voltage reference value for the current limit; In this formula: (12) in, The amplitude of the steady-state component of the fault current; This adaptive voltage command can precisely limit the steady-state component of the fault current to a preset safe value. the following.

[0035] S3, when the converter output current is detected to exceed the set threshold, an adaptive virtual impedance proportional to the degree of overcurrent is used to suppress the inrush current during the transient process of fault occurrence and clearance. Due to the low outer loop bandwidth, the current limiting strategy based on active power and voltage reference values ​​is not ideal for suppressing the inrush current during fault occurrence and clearance. Analysis of the fault current expression shows that the inrush current during the transient process is caused by a decaying DC component. Based on this, this embodiment proposes a dynamic virtual impedance method for transient process suppression. Unlike traditional virtual impedance methods that use a constant impedance value, the dynamic virtual impedance method sets the impedance value to an adaptive change proportional to the overcurrent, as shown in the following expression: (13) (14) (15) In the formula, For dynamic virtual resistance, For the output current of the grid-type converter, For dynamic virtual reactance, and These are the dq-axis components of the three-phase output current of the converter; This is the scaling factor for the virtual impedance; This is the ratio of virtual reactance to virtual resistance. This is the current threshold.

[0036] proportionality coefficient The value is determined when the most severe three-phase short-circuit fault occurs, to ensure that the current amplitude during the fault is limited to a specified value. : (16) in, Specify a value for the current amplitude during the fault; Whether the dynamic virtual impedance is activated depends on the output current of the grid converter. The size. When When the current drops below the threshold, the virtual impedance operates; when the current drops below the threshold, the virtual impedance automatically turns off, avoiding oscillations between turn-on and turn-off, and will not change the balance point and stability of the power angle during the fault steady-state phase.

[0037] The three control steps (S1~S3) independently determine the start-up timing based on different fault characteristic quantities, forming a complementary cooperation on the time scale during the fault ride-through process. The power adjustment in S1 and the voltage adjustment in S2 mainly deal with the stability and current limiting issues during the fault steady state, while the virtual impedance control in S3 specifically suppresses transient inrush current. The three work together to achieve stable operation guarantee throughout the entire process from fault occurrence to elimination.

[0038] Based on a similar inventive concept, embodiments of the present invention also provide a computer storage medium storing a readable program that, when run by a processor, can execute the above-described adaptive power-voltage coordinated fault ride-through control method for grid-type converters.

[0039] Based on a similar inventive concept, this invention provides an electronic device, including: a processor, a memory, a communication interface, and a communication bus, wherein the processor, the memory, and the communication interface communicate with each other through the communication bus; The memory is used to store at least one executable instruction, which causes the processor to perform the operation corresponding to the above-described adaptive power-voltage coordinated fault ride-through control method for grid-type converters.

[0040] Based on a similar inventive concept, embodiments of the present invention also provide a computer program product, including computer instructions, which instruct a computing device to perform the operations corresponding to the above-described adaptive power-voltage coordinated fault ride-through control method for grid-type converters.

[0041] Example 2 In this embodiment, an adaptive power-voltage coordinated fault ride-through control device for grid-type converters is proposed, specifically including: Adaptive power command generation unit: Real-time monitoring of grid voltage and grid connection point voltage. When the grid voltage drops to below 0.9 times the rated value, the active power reference value is dynamically corrected according to the degree of voltage drop. By establishing the power balance equation during the fault, the active power reference value that can maintain the power angle stability is calculated. Adaptive voltage command generation unit: Based on the degree of grid voltage drop and preset current limit requirements, it calculates in real time the voltage reference value that can limit the steady-state component of the fault current within a safe range by solving the voltage-current relationship equation. Dynamic virtual impedance control unit: When the converter output current is detected to exceed the set threshold, an adaptive virtual impedance proportional to the degree of overcurrent is used to suppress the inrush current during the transient process of fault occurrence and clearance.

[0042] Example 3 In this embodiment, the effectiveness of the control method proposed in Example 1 is verified through simulation experiments; Under the specified interference conditions, the system's frequency, power angle, current, and voltage waveforms are as follows: Figure 4 As shown in (a) to (d) in the figure. Simulation results show that, without any control strategy, the reference value of active power is always higher than the actual power during the fault. This causes the system to be in an accelerated state, the power angle to continue to increase, and the system cannot return to normal operation. Although the power angle remains within the range, the system can recover to stability after the fault is cleared, but there are still obvious oscillations in the power angle and frequency. When the proposed control strategy is implemented, the power angle and frequency of the system remain at the rated values ​​during the fault, and the inrush current is limited to the amplitude range. After the fault is cleared, the system continues to operate stably.

[0043] The methods of the present invention can be implemented in hardware, firmware, or as software or computer code that can be stored in a recording medium (such as a CD-ROM, RAM, floppy disk, hard disk, or magneto-optical disk), or as computer code originally stored on a remote recording medium or a non-transitory machine-readable medium and subsequently stored on a local recording medium, downloaded via a network. Thus, the methods described herein can be processed by software stored on a recording medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware (such as an ASIC or FPGA). It is understood that the computer, processor, microprocessor controller, or programmable hardware includes storage components (e.g., RAM, ROM, flash memory, etc.) capable of storing or receiving software or computer code that, when accessed and executed by the computer, processor, or hardware, implements the methods described herein. Furthermore, when a general-purpose computer accesses the code used to implement the methods shown herein, the execution of the code transforms the general-purpose computer into a dedicated computer for performing the methods shown herein.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. An adaptive power-voltage coordinated fault ride-through control method for grid-type converters, characterized in that, include: Real-time monitoring of grid voltage and grid connection point voltage; when the grid voltage drops to below 0.9 times the rated value, the active power reference value is dynamically corrected according to the degree of voltage drop; by establishing a power balance equation during the fault, the active power reference value that can maintain a stable power angle is calculated. Based on the degree of voltage drop in the power grid and the preset current limit requirements, the voltage reference value that can limit the steady-state component of the fault current within a safe range is calculated in real time by solving the voltage-current relationship equation. When the converter output current is detected to exceed the set threshold, an adaptive virtual impedance proportional to the degree of overcurrent is used to suppress the inrush current during the transient process of fault occurrence and clearance.

2. The adaptive power-voltage coordinated fault ride-through control method for grid-type converters according to claim 1, characterized in that, The process of dynamically adjusting the active power reference value includes: 1) Calculate the steady-state power angle during normal operation. : in, For grid impedance, for The corresponding impedance angle, This is the active power reference power; This is the grid voltage. This refers to the voltage at the grid connection point. 2) The original power angle equation is corrected based on the voltage drop, resulting in: in, Power output under fault conditions. This is the fault voltage. This is the grid voltage. For the angle of attack; 3) Based on the voltage at the time of the fault and Correct the power equation and adjust the power angle during a fault. The adjusted active power reference value was calculated. .

3. The adaptive power-voltage coordinated fault ride-through control method for grid-type converters according to claim 2, characterized in that, The adjustment rule for the active power reference value is as follows: 。 4. The adaptive power-voltage coordinated fault ride-through control method for grid-type converters according to claim 2, characterized in that, The formula for calculating the voltage reference value that can limit the steady-state component of the fault current within a safe range is: in, a As an auxiliary variable, I is the steady-state component of the fault current. For current limits, The voltage reference value is the current limit.

5. The adaptive power-voltage coordinated fault ride-through control method for grid-type converters according to claim 1, characterized in that, The expression for the adaptive virtual impedance is: In the formula, and These are the resistance and inductance, which are virtual impedances, respectively. The fault current amplitude, and These are the fault currents corresponding to d , q Axial components; This is the scaling factor for the virtual impedance; This is the ratio of virtual reactance to virtual resistance. This is the current threshold.

6. The adaptive power-voltage coordinated fault ride-through control method for grid-type converters according to claim 5, characterized in that, The scaling factor of virtual impedance The formula for calculation is: in, The current threshold during the fault period. The voltage reference value is the current limit.

7. A grid-type converter adaptive power-voltage coordinated fault ride-through control device, executing the control method according to any one of claims 1-6, characterized in that, include: Adaptive power command generation unit: Real-time monitoring of grid voltage and grid connection point voltage. When the grid voltage drops to below 0.9 times the rated value, the active power reference value is dynamically corrected according to the degree of voltage drop. By establishing the power balance equation during the fault, the active power reference value that can maintain the power angle stability is calculated. Adaptive voltage command generation unit: Based on the degree of grid voltage drop and preset current limit requirements, it calculates in real time the voltage reference value that can limit the steady-state component of the fault current within a safe range by solving the voltage-current relationship equation. Dynamic virtual impedance control unit: When the converter output current is detected to exceed the set threshold, an adaptive virtual impedance proportional to the degree of overcurrent is used to suppress the inrush current during the transient process of fault occurrence and clearance.

8. A computer storage medium storing a readable program, characterized in that, When the program runs, it can instruct the computing device to execute the adaptive power-voltage cooperative fault ride-through control method for grid-type converters as described in any one of claims 1-6.

9. An electronic device, characterized in that, include: The processor, memory, communication interface, and communication bus are provided, wherein the processor, memory, and communication interface communicate with each other via the communication bus. The memory is used to store at least one executable instruction that causes the processor to perform the operation corresponding to the adaptive power-voltage coordinated fault ride-through control method for grid-type converters as described in any one of claims 1-6.

10. A computer program product comprising computer instructions, characterized in that, The computer instructions instruct the computing device to perform the operation corresponding to the adaptive power-voltage cooperative fault ride-through control method for grid-type converters as described in any one of claims 1-6.

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