A fault recovery phase flow limiting constraint method for network equipment
By constructing an internal potential amplitude constraint model and phase compensation, the current limiting stability and reliability issues of grid-connected equipment during the fault recovery phase were resolved, achieving effective current limiting and safe equipment transition.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- STATE GRID GANSU ELECTRIC POWER RESEARCH INSTITUTE
- Filing Date
- 2026-04-20
- Publication Date
- 2026-07-14
AI Technical Summary
Existing network equipment control technologies have low current limiting stability and reliability during the fault recovery phase. Virtual impedance current limiting may lead to difficulties in exiting or transient instability, and current limiters have voltage loop saturation problems.
Based on the constraint relationship between internal potential, terminal voltage and line current, an internal potential amplitude constraint model is constructed. The upper or lower limit of the allowable internal potential amplitude is calculated by real-time measured voltage and current parameters, and the controller output is limited. Phase compensation is introduced during the fault recovery stage to correct the phase difference and ensure the effectiveness of the current limiting strategy.
It improves the stability and reliability of current limiting during the fault recovery phase, avoids difficulties in exiting or transient instability, and ensures the security of network equipment.
Smart Images
Figure CN122393882A_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of power system stability control technology, and more specifically, relates to a current limiting constraint method for the fault recovery phase of grid-connected equipment. Background Technology
[0002] With the rapid development of new energy technologies, power electronic converters have been widely used in power systems. The high proportion of new energy connected to the grid and the reduced proportion of traditional synchronous generators lead to a weakening of grid inertia and damping. New energy equipment, through grid-based control technology, can simulate the operating characteristics of synchronous generators, providing inertia and damping support to the grid. However, unlike synchronous generators, the power electronic switching devices in new energy equipment converters cannot withstand large current surges. Therefore, during fault periods, current-limiting strategies are needed to maintain the current within the equipment's tolerance range.
[0003] Virtual synchronous control technology is a widely used control technology for grid-connected equipment. It adopts a control structure of power outer loop control and voltage and current dual loop control. Based on this control structure, current limiting strategies under power system faults or virtual impedance (VI) design in the voltage and current loops can simulate the resistance and reactance in the actual circuit to dissipate excess energy during transient processes. However, current limiting through virtual impedance may face the situation of being unable to exit during the fault recovery phase, thus preventing the grid-connected equipment from returning to normal working state. There is also a method to directly limit the current by adding a current limiter, but the current limiter has the problem of voltage loop saturation, which may cause instability during the transient recovery phase.
[0004] In summary, during the fault recovery phase, the current limiting stability and reliability of existing network equipment control technologies are relatively low. Summary of the Invention
[0005] To address the shortcomings of existing technologies, the purpose of this application is to provide a current limiting constraint method for the fault recovery phase of network equipment, aiming to solve the problem of low current limiting stability and reliability caused by existing network equipment control technologies that directly limit current by virtual impedance or by adding current limiters.
[0006] To achieve the above objectives, in a first aspect, this application provides a current limiting constraint method for the fault recovery phase of network equipment, comprising: Based on the constraint relationship between the internal potential, terminal voltage and line current of the network equipment, an internal potential amplitude constraint model is constructed. Based on the real-time terminal voltage phase, real-time terminal voltage amplitude, real-time line current phase, real-time line current amplitude, and real-time internal potential phase of the network equipment, the first internal potential amplitude constraint value is obtained through the internal potential amplitude constraint model. The internal potential of the network equipment is constrained based on the first internal potential amplitude constraint value.
[0007] This application provides a novel current limiting method for the control structure of network equipment. Based on the characteristics of voltage and current vector amplitude / frequency changes, it analyzes the constraint relationship between internal potential, terminal voltage, and line current, and further derives the constraint relationship on the internal potential amplitude, constructing an internal potential amplitude constraint model. By measuring the real-time terminal voltage phase, real-time terminal voltage amplitude, real-time line current phase, real-time line current amplitude, and real-time internal potential phase of the network equipment in real time, the upper or lower limit of the allowable internal potential amplitude at the current moment can be directly calculated through the internal potential amplitude constraint model, thereby limiting the output of the controller to achieve current limiting. This allows the equipment to maintain the original virtual synchronous control structure during fault recovery while effectively limiting the current within the allowable value, avoiding the exit difficulties or transient instability problems that may be caused by existing methods, improving the current limiting stability and reliability during the fault recovery phase, and thus improving the safety of the network equipment.
[0008] According to the current limiting constraint method for the fault recovery phase of network equipment provided in this application, the method further includes: If the phase difference between the real-time internal potential phase and the real-time terminal voltage phase of the network-connected device is greater than a specific value, the internal potential phase compensation value is calculated based on the real-time internal potential phase, the real-time terminal voltage phase and the real-time terminal voltage amplitude of the network-connected device, and the real-time internal potential phase is compensated based on the internal potential phase compensation value to obtain the compensated internal potential phase. Based on the real-time terminal voltage phase, real-time terminal voltage amplitude, real-time line current phase, real-time line current amplitude, and the compensated internal potential phase of the network equipment, the second internal potential amplitude constraint value is obtained through the internal potential amplitude constraint model. Based on the compensated internal potential phase and the second internal potential amplitude constraint value, the internal potential of the network equipment is constrained.
[0009] To avoid the problem during the fault recovery phase where excessive changes in the terminal voltage vector during transient processes lead to a large phase difference between the internal potential and the internal potential vector, making it impossible for the internal potential amplitude constraint model to calculate the internal potential amplitude constraint value, this application introduces phase compensation to correct the real-time internal potential phase, reduce the phase difference between the internal potential and the terminal voltage, ensure that the internal potential amplitude constraint model always has a feasible solution, guarantee the effectiveness of the current limiting strategy, improve the current limiting stability and reliability during the fault recovery phase, and thus improve the safety of the network equipment.
[0010] According to the current limiting constraint method for the fault recovery phase of network equipment provided in this application, the constraint of the internal potential of the network equipment based on the compensated internal potential phase and the second internal potential amplitude constraint value includes: The coordinate transformation is performed on the compensated internal potential phase and the second internal potential amplitude constraint value to obtain a three-phase internal potential modulation wave; The three-phase internal potential modulation wave is subjected to PWM modulation to obtain the modulated three-phase internal potential modulation wave. Based on the modulated three-phase internal potential modulation wave, the three-phase internal potential of the voltage source type grid-connected converter of the grid-connected equipment is adjusted.
[0011] Secondly, this application provides a current limiting constraint device for the fault recovery phase of network equipment, comprising: The module is used to construct an internal potential amplitude constraint model based on the constraint relationship between the internal potential, terminal voltage and line current of the network equipment. The acquisition module is used to obtain a first internal potential amplitude constraint value based on the real-time terminal voltage phase, real-time terminal voltage amplitude, real-time line current phase, real-time line current amplitude, and real-time internal potential phase of the network equipment, through the internal potential amplitude constraint model. The constraint module is used to constrain the internal potential of the network equipment based on the first internal potential amplitude constraint value.
[0012] Thirdly, this application provides an electronic device, comprising: at least one memory for storing a program; and at least one processor for executing the program stored in the memory, wherein when the program stored in the memory is executed, the processor is configured to execute the current limiting constraint method for the fault recovery phase of a network device as described in the first aspect or any possible implementation thereof.
[0013] Fourthly, this application provides a computer-readable storage medium storing a computer program that, when executed on a processor, causes the processor to perform the current limiting constraint method for the fault recovery phase of a network device as described in the first aspect or any possible implementation of the first aspect.
[0014] Fifthly, this application provides a computer program product that, when run on a processor, causes the processor to execute the current limiting constraint method for the fault recovery phase of a network device as described in the first aspect or any possible implementation of the first aspect.
[0015] It is understood that the beneficial effects of the second to fifth aspects mentioned above can be found in the relevant descriptions in the first aspect mentioned above, and will not be repeated here.
[0016] Overall, the technical solutions conceived in this application have the following beneficial effects compared with the prior art: (1) This application provides a novel current limiting method for the control structure of network equipment. Based on the characteristic analysis of the change of voltage and current vector amplitude / frequency, the constraint relationship between internal potential, terminal voltage and line current is analyzed, and the constraint relationship of internal potential amplitude is further derived. An internal potential amplitude constraint model is constructed. By measuring the real-time terminal voltage phase, real-time terminal voltage amplitude, real-time line current phase, real-time line current amplitude and real-time internal potential phase of the network equipment in real time, the upper or lower limit of the allowable internal potential amplitude at the current moment can be directly calculated through the internal potential amplitude constraint model, thereby limiting the output of the controller and realizing current limiting. This allows the equipment to maintain the original virtual synchronous control structure during fault recovery and effectively limit the current within the allowable value, avoiding the exit difficulties or transient instability problems that may be caused by existing methods, improving the current limiting stability and reliability during the fault recovery stage, thereby improving the safety of network equipment.
[0017] (2) In order to avoid the problem that the phase difference between the terminal voltage vector and the internal potential vector is too large due to the excessive change of the terminal voltage vector during the fault recovery stage, which makes it impossible for the internal potential amplitude constraint model to calculate the internal potential amplitude constraint value, this application introduces phase compensation to correct the phase of the real-time internal potential, reduce the phase difference between the internal potential and the terminal voltage, ensure that the internal potential amplitude constraint model always has a feasible solution, ensure the effectiveness of the current limiting strategy, improve the current limiting stability and reliability during the fault recovery stage, and thus improve the safety of the network equipment. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 This is a flowchart illustrating the current limiting constraint method for the fault recovery phase of network equipment provided in this application embodiment; Figure 2 This is a schematic diagram of a virtual synchronous control structure without voltage and current dual loops provided in an embodiment of this application; Figure 3 This is a schematic diagram illustrating the constraint relationship between internal potential, terminal voltage, and line current provided in an embodiment of this application; Figure 4 This is a schematic diagram of the constraint structure for the fault recovery phase provided in an embodiment of this application; Figure 5 This is a schematic diagram of a converter grid-connected system provided in an embodiment of this application; Figure 6This is a schematic diagram of the current amplitude change during the fault recovery phase of a single-machine system provided in an embodiment of this application; Figure 7 This is an equivalent topology diagram of a two-machine system provided in the embodiments of this application; Figure 8 This is a schematic diagram of the current amplitude change of the GFM device during the fault recovery phase of a two-machine system provided in this application embodiment; Figure 9 This is a schematic diagram of the current limiting constraint device for the fault recovery phase of network equipment provided in an embodiment of this application; Figure 10 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.
[0021] In this article, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The symbol " / " in this article indicates that the related objects are in an "or" relationship; for example, A / B means A or B.
[0022] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.
[0023] In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more, for example, multiple processing units means two or more processing units, multiple elements means two or more elements, etc.
[0024] Next, combined Figures 1-8 This application provides a method for limiting current during the fault recovery phase of network equipment.
[0025] Figure 1 This is a flowchart illustrating the current limiting constraint method for the fault recovery phase of network equipment provided in this application embodiment, as shown below. Figure 1 As shown, the method includes the following steps: Step S1: Based on the constraint relationship between the internal potential, terminal voltage and line current of the network equipment, construct an internal potential amplitude constraint model; Figure 2 This is a schematic diagram of a virtual synchronous control structure without voltage and current dual loops provided in an embodiment of this application, as shown below. Figure 2 As shown, the internal potential amplitude The internal electromotive force frequency is directly generated by the error between the actual and commanded reactive power values through an integral element. The error between the actual and commanded active power values is directly generated through a virtual rotor motion equation, and the unbalanced active / reactive power directly drives the internal electromotive force amplitude. / frequency Make changes.
[0026] Specifically, the amplitude of the internal potential With reactive power command value Compared with actual value The relationship between them is: (1) in, The integral coefficient for reactive power control. It is an integral operator.
[0027] Command values of internal potential frequency and active power Compared with actual value The relationship between them is: (2) in Represents the virtual moment of inertia. Indicates virtual damping. Indicates the rated frequency of the power grid. Indicates the frequency of the internal potential. The phase of the internal potential is indicated.
[0028] Figure 3 This is a schematic diagram illustrating the constraint relationship between internal potential, terminal voltage, and line current provided in an embodiment of this application, such as... Figure 3 As shown, internal potential Line current With terminal voltage Both are vector forms, among which , , , , The amplitude and phase of the line current. , The magnitude and phase of the internal potential. , For the amplitude and phase of the terminal voltage, The symbol for the imaginary part is... Figure 3 The voltage and current constraint relationship across the filter inductor can be obtained as follows: (3) in, This is a filter inductor.
[0029] Further opening the parentheses in the differential equation yields: (4) in The frequency of the current vector.
[0030] Projecting the components on both sides of the equation (4) onto the direction of the internal potential vector, we obtain the following new relationship: (5) in , .
[0031] Further derivation of the relationship in equation (5) by expanding the vector in terms of real and imaginary parts yields the following relationship: (6) in, , , , We can obtain: (7) After further simplification, we get: (8) Further simplification and rearrangement of equation (8) yields: (9) Simplifying equation (9) further to the form that retains only the differential of the current amplitude, we can obtain: (10) Since the magnitude of the current vector is positive, the sign of the quantity on the left side of equation (10) can represent the sign of the differential of the current vector magnitude. That is, the expression on the left side of equation (10) can constrain the change of the current vector magnitude. The components are composed of the internal potential magnitude and the projections of the current and terminal voltage vectors in the directions parallel and perpendicular to the internal potential vector. Thus, constraint relationships can be designed: (11) This allows us to further obtain the specific constraint relationship for the internal potential amplitude: (12) An internal potential amplitude constraint model is constructed. This model completes the above process by inputting real-time terminal voltage phase, real-time terminal voltage amplitude, real-time line current phase, real-time line current amplitude, and real-time internal potential phase, and calculates the first internal potential amplitude constraint value. .
[0032] Step S2: Based on the real-time terminal voltage phase, real-time terminal voltage amplitude, real-time line current phase, real-time line current amplitude, and real-time internal potential phase of the network equipment, the first internal potential amplitude constraint value is obtained through the internal potential amplitude constraint model. First, the real-time terminal voltage phase, real-time terminal voltage amplitude, real-time line current phase, real-time line current amplitude, and real-time internal potential phase of the network equipment are collected. Then, the internal potential amplitude constraint model is input to obtain the first internal potential amplitude constraint value.
[0033] Step S3: Constrain the internal potential of the network equipment based on the first internal potential amplitude constraint value.
[0034] The internal potential of the grid-connecting equipment is adjusted so that the amplitude of the internal potential does not exceed the first internal potential amplitude constraint value, so that the current at the equipment outlet can be maintained within the limit range during the fault period, ensuring the safe operation of the grid-connecting equipment and enabling the grid-connecting equipment to smoothly transition to a stable working state.
[0035] The current limiting constraint method provided in this application for the fault recovery phase of network equipment offers a novel current limiting approach for the control structure of network equipment. Based on the characteristics of voltage and current vector amplitude / frequency changes, it analyzes the constraint relationship between internal potential, terminal voltage, and line current, and further derives the constraint relationship for the internal potential amplitude. An internal potential amplitude constraint model is constructed. By real-time measurement of the real-time terminal voltage phase, real-time terminal voltage amplitude, real-time line current phase, real-time line current amplitude, and real-time internal potential phase of the network equipment, the upper or lower limit of the allowable internal potential amplitude at the current moment can be directly calculated using the internal potential amplitude constraint model. This limits the controller output, achieving current limiting. During fault recovery, the equipment can maintain its original virtual synchronous control structure while effectively limiting the current within allowable values, avoiding exit difficulties or transient instability problems that may arise with existing methods. This improves the stability and reliability of current limiting during the fault recovery phase, thereby enhancing the safety of the network equipment.
[0036] In some embodiments, the method further includes: Step S4: If the phase difference between the real-time internal potential phase and the real-time terminal voltage phase of the network-connected device is greater than a specific value, calculate the internal potential phase compensation value based on the real-time internal potential phase, real-time terminal voltage phase and real-time terminal voltage amplitude of the network-connected device, and compensate the real-time internal potential phase based on the internal potential phase compensation value to obtain the compensated internal potential phase. Step S5: Based on the real-time terminal voltage phase, real-time terminal voltage amplitude, real-time line current phase, real-time line current amplitude, and compensated internal potential phase of the network equipment, obtain the second internal potential amplitude constraint value through the internal potential amplitude constraint model. Step S6: Constrain the internal potential of the network equipment based on the compensated internal potential phase and the second internal potential amplitude constraint value.
[0037] During the fault recovery phase, if the terminal voltage vector changes too much during the transient process, its phase difference with the internal potential vector may be too large, which may cause equation (12) to have no positive solution. Therefore, it is necessary to compensate for the phase of the internal potential vector during the fault recovery phase. (13) in, This is the phase compensation value. This represents the phase of the compensated internal potential vector.
[0038] Figure 4 This is a schematic diagram of the constraint structure for the fault recovery phase provided in an embodiment of this application, as shown below. Figure 4 As shown, Figure 4 In , is the phase compensation value. This indicates that the device has detected a signal after the fault has been cleared.
[0039] After phase compensation, all equations (3)-(12) will be used. Replace with The second internal potential amplitude constraint value is calculated, and then the internal potential of the network equipment is constrained based on the compensated internal potential phase and the second internal potential amplitude constraint value.
[0040] In some embodiments, step S6 specifically includes: Step S61: Perform coordinate transformation on the compensated internal potential phase and the second internal potential amplitude constraint value to obtain the three-phase internal potential modulation wave. Step S62: PWM modulation is performed on the three-phase internal potential modulation wave to obtain the modulated three-phase internal potential modulation wave. Step S63: Based on the modulated three-phase internal potential modulation wave, adjust the three-phase internal potential of the voltage source type grid-connected converter of the grid-connected equipment.
[0041] Optionally, the second internal potential amplitude constraint value is set. Phase with compensated internal potential The three-phase internal potential modulation wave is obtained after coordinate transformation. , , The formula is as follows:
[0042] in, , , This is an instantaneous value.
[0043] Modulation wave of three-phase internal potential , , After PWM modulation, the voltage source grid-connected converter is regulated.
[0044] Figure 5 This is a schematic diagram of a converter grid-connected system provided in an embodiment of this application, as shown below. Figure 5 As shown, in one embodiment of this application, a converter grid-connected system is built in Matlab / Simulink. To simplify the analysis, a three-phase symmetrical short-circuit experiment is performed at the terminal voltage of the single-machine infinite bus system, and a comparison is made of the device current waveforms before and after using this constraint strategy during the fault recovery phase. Grounding resistance Power reference value The voltage reference value is Filter inductor Line inductance Grid voltage Active power command value during stable operation reactive power command value The maximum allowable current amplitude of the equipment is .
[0045] Figure 6 This is a schematic diagram of current amplitude changes during the fault recovery phase of a single-machine system provided in this application embodiment. In the above embodiment, a comparison diagram of the device current waveforms before and after using the constraint strategy during the fault recovery phase is shown below. Figure 6 As shown.
[0046] Figure 7 This is an equivalent topology diagram of a two-machine system provided in the embodiments of this application, such as... Figure 7 As shown, in one embodiment of this application, to enhance the illustrative effect, in the case of... Figure 7 Short-circuit fault tests were also performed on the two-machine system shown. One device is a network-following device (GFL), and the other is a network control device (GFL).
[0047] Figure 8 This is a schematic diagram of the current amplitude change of the GFM device during the fault recovery phase of a two-machine system provided in this application embodiment. In the above embodiment, the current amplitude change is as follows: Figure 8 As shown in the figure, the results demonstrate that the current limiting strategy proposed in this application can effectively limit the device current from exceeding the specified value during the recovery phase.
[0048] The current limiting constraint device for the fault recovery phase of network equipment provided in this application is described below. The current limiting constraint device for the fault recovery phase of network equipment described below can be referred to in correspondence with the current limiting constraint method for the fault recovery phase of network equipment described above.
[0049] Figure 9 This is a schematic diagram of a current limiting constraint device for the fault recovery phase of network equipment, provided in an embodiment of this application. Figure 9 As shown, the device 900 includes: Module 910 is used to construct an internal potential amplitude constraint model based on the constraint relationship between the internal potential, terminal voltage and line current of the network equipment. The acquisition module 920 is used to obtain the first internal potential amplitude constraint value based on the real-time terminal voltage phase, real-time terminal voltage amplitude, real-time line current phase, real-time line current amplitude, and real-time internal potential phase of the network equipment, through the internal potential amplitude constraint model. The constraint module 930 is used to constrain the internal potential of the network equipment based on the first internal potential amplitude constraint value.
[0050] It should be understood that the above-described device is used to execute the methods in the above embodiments. The implementation principle and technical effect of the corresponding program modules in the device are similar to those described in the above methods. The working process of the device can be referred to the corresponding process in the above methods, and will not be repeated here.
[0051] Based on the methods in the above embodiments, Figure 10 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 10 As shown in the figure, this application embodiment provides an electronic device, which may include: a processor 1010, a communication interface 1020, a memory 1030, and a communication bus 1040, wherein the processor 1010, the communication interface 1020, and the memory 1030 communicate with each other through the communication bus 1040. The processor 1010 can call logical instructions in the memory 1030 to execute the current limiting constraint method for the fault recovery phase of network equipment in the above embodiment.
[0052] Furthermore, the logical instructions in the aforementioned memory 1030 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the fault-limiting constraint method for network equipment described in the various embodiments of this application.
[0053] Based on the methods in the above embodiments, this application provides a computer-readable storage medium storing a computer program. When the computer program runs on a processor, it causes the processor to execute the current limiting constraint method for the fault recovery phase of network equipment in the above embodiments.
[0054] Based on the methods in the above embodiments, this application provides a computer program product that, when running on a processor, causes the processor to execute the current limiting constraint method for the fault recovery phase of network equipment in the above embodiments.
[0055] It is understood that the processor in the embodiments of this application can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. A general-purpose processor can be a microprocessor or any conventional processor.
[0056] The method steps in this application embodiment can be implemented in hardware or by a processor executing software instructions. The software instructions can consist of corresponding software modules, which can be stored in random access memory (RAM), flash memory, read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), registers, hard disks, portable hard disks, CD-ROMs, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor, enabling the processor to read information from and write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and the storage medium can reside in an ASIC.
[0057] In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially as a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted through the computer-readable storage medium. The computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state disk (SSD)).
[0058] It is understood that the various numerical designations used in the embodiments of this application are merely for the convenience of description and are not intended to limit the scope of the embodiments of this application.
[0059] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.
Claims
1. A current limiting constraint method for the fault recovery phase of network equipment, characterized in that, include: Based on the constraint relationship between the internal potential, terminal voltage and line current of the network equipment, an internal potential amplitude constraint model is constructed. Based on the real-time terminal voltage phase, real-time terminal voltage amplitude, real-time line current phase, real-time line current amplitude, and real-time internal potential phase of the network equipment, the first internal potential amplitude constraint value is obtained through the internal potential amplitude constraint model. The internal potential of the network equipment is constrained based on the first internal potential amplitude constraint value.
2. The current limiting constraint method for the fault recovery phase of network equipment according to claim 1, characterized in that, The method further includes: If the phase difference between the real-time internal potential phase and the real-time terminal voltage phase of the network-connected device is greater than a specific value, the internal potential phase compensation value is calculated based on the real-time internal potential phase, the real-time terminal voltage phase and the real-time terminal voltage amplitude of the network-connected device, and the real-time internal potential phase is compensated based on the internal potential phase compensation value to obtain the compensated internal potential phase. Based on the real-time terminal voltage phase, real-time terminal voltage amplitude, real-time line current phase, real-time line current amplitude, and the compensated internal potential phase of the network equipment, the second internal potential amplitude constraint value is obtained through the internal potential amplitude constraint model. Based on the compensated internal potential phase and the second internal potential amplitude constraint value, the internal potential of the network equipment is constrained.
3. The current limiting constraint method for the fault recovery phase of network equipment according to claim 2, characterized in that, The constraint on the internal potential of the network equipment based on the compensated internal potential phase and the second internal potential amplitude constraint value includes: The coordinate transformation is performed on the compensated internal potential phase and the second internal potential amplitude constraint value to obtain a three-phase internal potential modulation wave; The three-phase internal potential modulation wave is subjected to PWM modulation to obtain the modulated three-phase internal potential modulation wave. Based on the modulated three-phase internal potential modulation wave, the three-phase internal potential of the voltage source type grid-connected converter of the grid-connected equipment is adjusted.
4. A current limiting constraint device for the fault recovery phase of network equipment, characterized in that, include: The module is used to construct an internal potential amplitude constraint model based on the constraint relationship between the internal potential, terminal voltage and line current of the network equipment. The acquisition module is used to obtain a first internal potential amplitude constraint value based on the real-time terminal voltage phase, real-time terminal voltage amplitude, real-time line current phase, real-time line current amplitude, and real-time internal potential phase of the network equipment, through the internal potential amplitude constraint model. The constraint module is used to constrain the internal potential of the network equipment based on the first internal potential amplitude constraint value.
5. An electronic device, characterized in that, include: At least one memory for storing computer programs; At least one processor is configured to execute a program stored in the memory, wherein when the program stored in the memory is executed, the processor is configured to execute the current limiting constraint method for the fault recovery phase of a network device as described in any one of claims 1-3.
6. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is run on the processor, the processor performs the current limiting constraint method for the fault recovery phase of network equipment as described in any one of claims 1-3.
7. A computer program product, characterized in that, When the computer program product is run on the processor, the processor performs the current limiting constraint method for the fault recovery phase of network equipment as described in any one of claims 1-3.