A method for evaluating the power quality control potential of power electronic devices in distribution networks

Abstract

The present application proposes a method for evaluating the power quality control potential of power electronic devices in a distribution network, wherein the method includes: reading the types of power electronic devices in the distribution network, dividing them into power quality dedicated control equipment and source-grid-load power electronic devices, and marking the types of power quality control problems that can be solved by each of them; calculating the ideal available capacity according to the rated capacity and current operating status of each power electronic device; calculating the actual available capacity of each power electronic device according to the ideal available capacity and current operating status, combined with the impedance, grid connection requirement restrictions and power loss in the power quality control process; and obtaining the adjustable potential based on the power quality problem control type and actual available capacity of each power electronic device. This method fully considers the exploration of the regulation potential of distributed resources on the source / grid / load side and traditional power quality dedicated equipment, and effectively solves the problem of accurately exploring the regulation potential of multiple types of equipment under conditions of different equipment characteristics and complex working conditions.

Description

Technical Field

[0001] The present application relates to the technical field of power electronics and power quality, and in particular to a method for evaluating the power quality control potential of power electronic devices in a distribution network. Background Art

[0002] In response to the power quality issues in power distribution systems with a high proportion of renewable energy, researchers at home and abroad have proposed a variety of solutions, but they mainly rely on the installation of dedicated management equipment such as active power filters and static VAR compensators. Based on the active control technology of power electronic components, ABB of Switzerland has proposed a digital solution to accurately manage power quality. Hunan University has fully utilized the characteristics and advantages of active and passive components and proposed a variety of "active + passive" hybrid power quality management equipment. However, the existing dedicated management equipment can only solve specific power quality problems, and the equipment has been idle for a long time and has low utilization rate. The large-scale installation of dedicated equipment is difficult to improve the overall power quality of the "double high" power distribution system, and faces prominent problems such as high cost and low equipment utilization.

[0003] Compared to the large-scale addition of specialized power quality equipment, high-renewable energy distribution systems have a large number of distributed resources on the source, grid, and load sides, offering significant potential for regulation. Therefore, fully tapping the regulatory potential of these distributed resources and traditional specialized power quality equipment is an effective means of achieving low-cost, dual-high power quality management in distribution networks. However, the diverse characteristics of these distributed resources and their complex operating conditions make accurate exploration of this regulatory potential difficult.

[0004] In summary, as the proportion of power electronics equipment increases, it is imperative to explore the potential of existing power electronics in power quality management. However, power electronics equipment has different characteristics and complex operating conditions. Accurately exploring the potential for regulation is the key to utilizing power electronics equipment in power quality management. Summary of the Invention

[0005] The present application aims to solve one of the technical problems in the related art at least to a certain extent.

[0006] To this end, the first purpose of this application is to propose a method for evaluating the power quality control potential of power electronic devices in distribution networks, so as to achieve accurate analysis of the potential of power electronic devices to participate in power quality control of distribution networks.

[0007] The second objective of the present application is to provide a device for evaluating the power quality control potential of power electronic devices in a distribution network.

[0008] The third objective of this application is to provide an electronic device.

[0009] The fourth object of this application is to provide a computer-readable storage medium.

[0010] A fifth object of this application is to provide a computer program product.

[0011] To achieve the above objectives, the first embodiment of the present application proposes a method for evaluating the power quality control potential of a power electronic device in a distribution network, comprising:

[0012] Read the types of power electronic devices in the distribution network, divide them into power quality dedicated management equipment and source-grid-load power electronic devices, and mark the types of power quality control problems they can solve;

[0013] Calculate the ideal available capacity of each power electronic device based on its rated capacity and current operating status;

[0014] Calculate the actual available capacity of each power electronic device based on its ideal available capacity and current operating status, combined with the impedance, grid connection requirements, and power loss in the power quality management process;

[0015] Based on the power quality problem control type and actual available capacity of each power electronic device, the adjustable potential of each power electronic device is obtained.

[0016] Optionally, the reading of the types of power electronic devices in the distribution network, classifying them into power quality dedicated management equipment and source-grid-load power electronic devices, and marking the types of power quality control issues that can be solved by each of them, further includes:

[0017] Read the types of power electronic devices in the distribution network and classify them into dedicated power quality management equipment and source-grid-load power electronic devices. For distribution network scenarios that include PV inverters, distributed energy storage converters, electric vehicle charging converters, static VAR generators (SVGs), active power filters (APFs), and medium-voltage equipment, PV inverters, distributed energy storage converters, and electric vehicle charging converters are classified as dedicated power quality management equipment, while APFs, APGs, and medium-voltage equipment are classified as source-grid-load power electronic devices.

[0018] For the power quality control equipment, according to its own adjustment function, mark the type of power quality problem it can solve, including: photovoltaic inverter solves harmonic and voltage fluctuation problems, distributed energy storage converter solves harmonic problems, voltage fluctuation problems and three-phase imbalance problems, electric vehicle charging converter solves harmonic and voltage fluctuation problems;

[0019] For the source-grid-load power electronic devices, according to their own characteristics and software and hardware conditions, the types of power quality control problems they can solve are marked, including: APF solves harmonic problems, SVG solves voltage fluctuation problems, and medium-voltage equipment solves harmonic and voltage fluctuation problems.

[0020] Optionally, for the power quality dedicated management equipment, the calculating of the actual available capacity of each power electronic device includes:

[0021] Read the rated capacity and current operating status of each power quality management equipment, and calculate the ideal available capacity of each power grid load power electronic device;

[0022] Based on the ideal available capacity and current operating status of each power quality control equipment, combined with the impedance between the equipment and the point to be controlled, the energy loss in the power quality control process is calculated to obtain the actual available capacity of each power quality control equipment.

[0023] Optionally, for the source-grid-load power electronic devices, the calculating of the actual available capacity of each power electronic device includes:

[0024] Read the rated capacity and current operating status of each source grid load power electronic device, and calculate the ideal available capacity of each source grid load power electronic device;

[0025] Based on the ideal available capacity and current operating status of each source, grid and load power electronic device, combined with the grid connection requirements and power losses in the management process of the electronic device, the actual available capacity of each source, grid and load power electronic device is calculated.

[0026] To achieve the above-mentioned objectives, a second embodiment of the present application provides a device for evaluating the power quality control potential of a power electronic device in a distribution network, comprising:

[0027] The classification and labeling module is used to read the types of power electronic devices in the distribution network, classify them into power quality dedicated management equipment and source-grid-load power electronic devices, and label the types of power quality control that each device can solve;

[0028] An ideal available capacity calculation module is used to calculate the ideal available capacity of each power electronic device based on the rated capacity and current operating status of each power electronic device;

[0029] The actual available capacity calculation module calculates the actual available capacity of each power electronic device based on its ideal available capacity and current operating status, combined with the impedance, grid connection requirements and power loss in the power quality management process;

[0030] The potential calculation module is used to obtain the adjustable potential of each power electronic device based on the power quality problem control type and actual available capacity of each power electronic device.

[0031] To achieve the above-mentioned purpose, a third embodiment of the present application provides an electronic device, comprising: a processor, and a memory communicatively connected to the processor;

[0032] The memory stores computer-executable instructions;

[0033] The processor executes the computer-executable instructions stored in the memory to implement the method as described in any one of the first aspects.

[0034] To achieve the above-mentioned purpose, the fourth embodiment of the present application proposes a computer-readable storage medium, which stores computer-executable instructions. When the computer-executable instructions are executed by a processor, they are used to implement the method as described in any one of the first aspects.

[0035] To achieve the above-mentioned objectives, the fifth embodiment of the present application proposes a computer program product, which implements any one of the methods in the first aspect when executed by a processor.

[0036] The technical solutions provided by the embodiments of this application bring at least the following beneficial effects:

[0037] First, by effectively labeling the types of power quality control issues of power electronic devices, this application clarifies the power quality issues that can be controlled by each power electronic device in the dual-high-voltage distribution network. Compared with existing methods, this application broadens the control types of each source-grid-load power electronic device.

[0038] Second, this application fully considers the exploration of the regulation potential of distributed resources on the source / grid / load side and traditional power quality-specific equipment, and effectively solves the problem of accurately exploring the regulation potential of multiple types of equipment under different equipment characteristics and complex working conditions.

[0039] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0041] Figure 1 A flow chart of a method for evaluating the power quality control potential of power electronic devices in a distribution network provided in an embodiment of the present application;

[0042] Figure 2 A schematic diagram of a judgment flow of a method for evaluating the power quality control potential of power electronic devices in a distribution network provided in an embodiment of the present application;

[0043] Figure 3 A schematic diagram of a dual-high-voltage distribution network in a certain scenario provided by an embodiment of the present application;

[0044] Figure 4A flowchart of the power quality problem control type labeling process provided in an embodiment of the present application;

[0045] Figure 5 A schematic diagram of the reactive power regulation range of a photovoltaic power source under standard constant reactive power regulation range in a certain scenario provided by an embodiment of the present application;

[0046] Figure 6 A schematic diagram of the reactive power regulation range of a photovoltaic power source under no-light conditions in a certain scenario provided by an embodiment of the present application;

[0047] Figure 7 A schematic diagram of the reactive power regulation range of a distributed energy storage system in a certain scenario provided by an embodiment of the present application;

[0048] Figure 8 A schematic diagram of photovoltaic operation in other reactive power control modes in a dual-high-voltage distribution network of multiple types of source-grid-load converters in another scenario provided by an embodiment of the present application;

[0049] Figure 9 A schematic diagram of the structure of a device for evaluating the power quality control potential of a power electronic device in a distribution network provided in an embodiment of the present application; DETAILED DESCRIPTION

[0050] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0051] In response to the power quality issues in power distribution systems with a high proportion of renewable energy, researchers at home and abroad have proposed a variety of solutions, but they mainly rely on the installation of dedicated management equipment such as active power filters and static VAR compensators. Based on the active control technology of power electronic components, ABB of Switzerland has proposed a digital solution to accurately manage power quality. Hunan University has fully utilized the characteristics and advantages of active and passive components and proposed a variety of "active + passive" hybrid power quality management equipment. However, the existing dedicated management equipment can only solve specific power quality problems, and the equipment has been idle for a long time and has low utilization rate. The large-scale installation of dedicated equipment is difficult to improve the overall power quality of the "double high" power distribution system, and faces prominent problems such as high cost and low equipment utilization.

[0052] Compared to the large-scale addition of specialized power quality equipment, high-renewable energy distribution systems have a large number of distributed resources on the source, grid, and load sides, offering significant potential for regulation. Therefore, fully tapping the regulatory potential of these distributed resources and traditional specialized power quality equipment is an effective means of achieving low-cost, dual-high power quality management in distribution networks. However, the diverse characteristics of these distributed resources and their complex operating conditions make accurate exploration of this regulatory potential difficult.

[0053] In summary, as the proportion of power electronics equipment increases, it is imperative to explore the potential of existing power electronics in power quality management. However, power electronics equipment has different characteristics and complex operating conditions. Accurately exploring the potential for regulation is the key to utilizing power electronics equipment in power quality management.

[0054] To address this issue, the present invention provides a method for evaluating the power quality control potential of power electronic devices in a distribution network. Figure 1 and Figure 2 A flow chart and a judgment flow chart of a method for evaluating the power quality control potential of power electronic devices in a distribution network provided in an embodiment of the present application.

[0055] like Figure 1 As shown, the method includes the following steps:

[0056] Step 101: Read the types of power electronic devices in the distribution network, classify them into power quality dedicated management equipment and source-grid-load power electronic devices, and mark the types of power quality control problems that they can solve respectively.

[0057] In the embodiment of the present application, the types of power electronic devices in the distribution network are read and divided into power quality dedicated management equipment and source-grid-load power electronic devices.

[0058] In one embodiment, for Figure 3 In the dual-high-voltage distribution network shown, each source-grid-load power electronic device operates in a constant power factor operation mode, including 6 photovoltaic inverters, 4 distributed energy storage converters, 3 electric vehicle charging converters, 2 static VAR generators SVG, 1 active power filter APF, and 1 medium voltage equipment.

[0059] Classify according to the following classification rules:

[0060] Special power quality management equipment: photovoltaic inverters, distributed energy storage converters, electric vehicle charging converters;

[0061] Source-grid-load power electronic devices: APF, APG, medium voltage equipment.

[0062] Furthermore, in the embodiment of the present application, Figure 4As shown in the figure, for the power quality special management equipment, according to its own adjustment function, the type of power quality problem control it can solve is marked; and for the source-grid-load power electronic device, according to its own characteristics and software and hardware conditions, the type of power quality problem control it can solve is marked.

[0063] Among them, the types of power quality control involved are: photovoltaic inverters solve harmonic and voltage fluctuation problems, distributed energy storage converters solve harmonic problems, voltage fluctuation problems and three-phase imbalance problems, electric vehicle charging converters solve harmonic and voltage fluctuation problems, APF solves harmonic problems, SVG solves voltage fluctuation problems, and medium voltage equipment solves harmonic and voltage fluctuation problems.

[0064] Specifically, photovoltaic inverters are primarily used to address harmonics and voltage fluctuations. By optimizing the output current waveform and stabilizing voltage output, photovoltaic inverters can effectively reduce harmonic content and stabilize grid voltage.

[0065] Distributed energy storage converters can solve harmonic problems, voltage fluctuation problems, and three-phase imbalance problems. Energy storage converters can not only provide harmonic suppression functions, but also balance grid voltage fluctuations through charge and discharge regulation, and adjust the output when the load is unbalanced to achieve three-phase current balance.

[0066] Electric vehicle charging converters are used to suppress harmonics and mitigate voltage fluctuations. Electric vehicle charging processes are prone to generating harmonics. Charging converters can adjust the charging current waveform, reducing harmonics while also compensating for grid voltage fluctuations.

[0067] APF is specifically designed to dynamically compensate for harmonics. It can monitor and suppress harmonic components in the power grid in real time, improving the current waveform and thus reducing harmonic interference on the power grid and electrical equipment.

[0068] SVG is primarily used to address voltage fluctuations. SVG can quickly respond to voltage changes and provide reactive power support to balance and stabilize the voltage level of the power grid.

[0069] Medium-voltage equipment is used to address harmonics and voltage fluctuations. It typically features powerful reactive power compensation and harmonic filtering capabilities, effectively suppressing harmonics and stabilizing voltage in the medium-voltage grid.

[0070] Step 102 : Calculate the ideal available capacity of each power electronic device according to the rated capacity and current operating status of each power electronic device.

[0071] Ideal available capacity reflects the theoretical maximum output capacity of the equipment without considering energy loss and external factors, and is usually based on the rated parameters and current operating status of the equipment.

[0072] In the embodiment of the present application, for the calculation process of the ideal capacity of the photovoltaic inverter, refer to Figure 5 The schematic diagram of the photovoltaic power supply under the standard constant reactive power regulation range is shown.

[0073] According to GB / T 19964-2012, "Technical Regulations for the Integration of Photovoltaic Generators into Power Systems," the reactive power of grid-connected photovoltaic inverters must be dynamically adjustable within a power factor range of 0.95 leading to 0.95 lagging. Taking into account the power factor limit, the reactive power range of the photovoltaic power source can be calculated using the following formula:

[0074]

[0075] in, is the photovoltaic reactive power, is the photovoltaic active power, is the photovoltaic installed capacity, is the power factor.

[0076] When Figure 6 As shown, under no light conditions, and is zero, so the reactive power regulation range of the photovoltaic power source can be obtained as follows:

[0077]

[0078] In the embodiment of the present application, for the calculation process of the ideal capacity of the distributed energy storage converter, refer to Figure 7 Schematic diagram of the reactive power regulation range of the distributed energy storage system shown.

[0079] Distributed energy storage has the ability to operate flexibly in four quadrants. According to GB / T 36552-2018, "Technical Regulations for the Integration of Energy Storage Systems into Power Systems," grid-connected energy storage inverters must implement constant power control, constant power factor control, and constant current control. If constant power factor control is used, the reactive power adjustment range can be determined according to the following formula:

[0080]

[0081] Among them, QBESS is the energy storage reactive power, PBESS is the energy storage active power, CBESS is the energy storage installed capacity, and cos(ɵ) is the power factor. And:

[0082]

[0083] Therefore, when distributed photovoltaics and distributed energy storage operate in a constant power factor (0.95) mode, their maximum reactive power is 0.31 times their installed capacity.

[0084] Similarly, using a similar method, we can calculate that the maximum reactive power that electric vehicle charging inverters and medium-voltage equipment can provide is 0.31 times their installed capacity. SVGs, on the other hand, are devices specifically designed to provide reactive power compensation, and their reactive power adjustment range is determined by the installed reactive power capacity. APFs are devices used to dynamically compensate for harmonics and reactive power, and their reactive power compensation capacity is determined by the installed capacity.

[0085] Therefore, based on the description of the power factor and reactive power compensation capability of different power electronic devices in specific operating modes, the maximum reactive power compensation power of the IEEE 33-bus system at a power factor of 0.95 can be estimated as:

[0086]

[0087] in, , which are the reactive power compensation coefficients of photovoltaic inverters, distributed energy storage converters, electric vehicle charging converters, and medium voltage equipment

[0088] This formula comprehensively considers the reactive power compensation capabilities of various power electronic devices under constant power factor (0.95) conditions. By summing up the reactive power capacities of different power electronic devices, the maximum reactive compensation power of the system under these conditions is obtained.

[0089] in addition, Figure 8 This is a schematic diagram of photovoltaic operation in other reactive power control modes in a dual-high-voltage distribution network of multiple types of source-grid-load converters in another scenario provided by an embodiment of the present application. Figure 8 The embodiment shown shows that each power electronic device of the present application can operate in a variety of flexible control modes, and its potential evaluation method is similar to Figure 3 The embodiments shown are similar.

[0090] Step 103 , based on the ideal available capacity and current operating status of each power electronic device, combined with the impedance, grid connection requirement restrictions and power loss in the power quality management process, the actual available capacity of each power electronic device is calculated.

[0091] It's understandable that during power transmission between a power electronic device and the point to be treated, energy loss occurs due to the resistance and reactance of the line. Specifically, when current passes through the line between the power electronic device and the point to be treated, power loss occurs due to the impedance. This energy loss is primarily determined by the device's output current and the line impedance.

[0092] That is, the actual available capacity represents the real output capability that each power electronic device can provide under the current operating state and actual power transmission conditions.

[0093] In the present application, refer to Figure 2For each power quality control equipment, based on the ideal available capacity and current operating status of each power quality control equipment, combined with the impedance between the equipment and the point to be controlled, the energy loss in the power quality control process is calculated to obtain the actual available capacity of each power quality control equipment.

[0094] For each source-grid-load power electronic device, the actual available capacity of each source-grid-load power electronic device is calculated based on its ideal available capacity and current operating status, combined with the grid-connected requirements and restrictions of the electronic device and the power loss in the governance process.

[0095] It should be noted that the method for calculating power loss can adopt the existing mature method, which is calculated by combining the impedance between the power quality control location and the converter with the voltage and current under the current working state. This application does not provide too much description and explanation on this.

[0096] Step 104 : Obtain the adjustable potential of each power electronic device based on the power quality problem control type and the actual available capacity of each power electronic device.

[0097] It can be understood that the adjustable potential of each power electronic device refers to the maximum adjustment capability it can provide under current operating conditions based on different types of power quality issues (such as harmonic control, voltage fluctuation compensation and reactive power compensation).

[0098] Finally, the actual available capacity is mapped to the control type of each power electronic device, yielding the device's adjustable potential under specific power quality conditions. For example, if the device's control type is reactive power compensation, its adjustable potential is the reactive power portion of its actual available capacity.

[0099] In order to implement the above embodiments, the present application also proposes a device for evaluating the power quality control potential of power electronic devices in a distribution network. Figure 9 This is a schematic diagram of the structure of a power quality control potential assessment device 10 for power electronic devices in a distribution network provided in an embodiment of the present application. Figure 9 As shown, the device includes:

[0100] The classification and labeling module 100 is used to read the types of power electronic devices in the distribution network, classify them into power quality dedicated management equipment and source-grid-load power electronic devices, and label the types of power quality control problems that each can solve;

[0101] The ideal available capacity calculation module 200 is used to calculate the ideal available capacity of each power electronic device according to the rated capacity and current operating status of each power electronic device;

[0102] The actual available capacity calculation module 300 calculates the actual available capacity of each power electronic device based on the ideal available capacity and current operating status of each power electronic device, combined with the impedance, grid connection requirements and power loss in the power quality management process;

[0103] The potential calculation module 400 is used to obtain the adjustable potential of each power electronic device based on the power quality problem control type and actual available capacity of each power electronic device.

[0104] In order to implement the above embodiments, the present application also proposes an electronic device, comprising: a processor, and a memory communicatively connected to the processor; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory to implement the method provided by the above embodiments.

[0105] In order to implement the above embodiments, the present application also proposes a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the methods provided by the above embodiments.

[0106] In order to implement the above embodiments, the present application also proposes a computer program product, including a computer program, which implements the methods provided by the above embodiments when executed by a processor.

[0107] The collection, storage, use, processing, transmission, provision and disclosure of user personal information involved in this application are in compliance with relevant laws and regulations and do not violate public order and good morals.

[0108] It is important to note that personal information collected from users should be used for legitimate and reasonable purposes and should not be shared or sold beyond these legitimate uses. Furthermore, such collection / sharing should be conducted only after receiving the user's informed consent, including but not limited to notifying the user to read the user agreement / user notice and sign an agreement / authorization that includes the relevant user information before using the feature. Furthermore, any necessary steps must be taken to safeguard and secure access to such personal information and ensure that others with access to personal information comply with its privacy policy and procedures.

[0109] This application contemplates providing implementations that allow users to selectively block the use or access of personal information data. Specifically, this disclosure contemplates providing hardware and / or software to prevent or block access to such personal information data. Risks can be minimized by limiting data collection and deleting data once it is no longer needed. Furthermore, where applicable, such personal information can be de-identified to protect user privacy.

[0110] In the descriptions of the foregoing embodiments, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and features of different embodiments or examples, unless they are mutually inconsistent.

[0111] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0112] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0113] The logic and / or steps represented in a flowchart or otherwise described herein, for example, can be considered a sequenced list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable medium" is any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (not exhaustive) of computer-readable media include: an electrical connection with one or more wires (electronic devices), a portable computer disk cartridge (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic devices, and a portable compact disc read-only memory (CDROM). Furthermore, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing it in another suitable manner if necessary, and then storing it in a computer memory.

[0114] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used: a discrete logic circuit having logic gate circuits for implementing logical functions on data signals, an application-specific integrated circuit having suitable combinational logic gate circuits, a programmable gate array (PGA), a field-programmable gate array (FPGA), etc.

[0115] Those skilled in the art will understand that all or part of the steps in the method of the above embodiment can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiment.

[0116] In addition, the functional units in the various embodiments of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into a module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0117] The storage medium mentioned above may be a read-only memory, a magnetic disk, or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application. Persons skilled in the art may make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

[0118] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this application can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of this application can be achieved. This is not limited herein.

[0119] The above specific embodiments do not constitute a limitation on the scope of protection of this application. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application shall be included within the scope of protection of this application.

Claims

1. A method for evaluating the power quality control potential of power electronic devices in a distribution network, characterized in that: The following steps are involved: Read the types of power electronic devices in the distribution network, divide them into power quality special management equipment and source-grid-load power electronic devices, and mark the types of power quality control problems they can solve, including: Read the types of power electronic devices in the distribution network, divide them into power quality special management equipment and source-grid-load power electronic devices, among which, for the distribution network scenario including photovoltaic inverters, distributed energy storage converters, electric vehicle charging converters, static VAR generators SVG, active power filters APF and medium voltage equipment, divide photovoltaic inverters, distributed energy storage converters, and electric vehicle charging converters into power quality special management equipment, and divide APF, APG, medium voltage Equipment is divided into source-grid-load power electronic devices; for the power quality control equipment, according to its own adjustment function, the types of power quality problems it can solve are marked, including: photovoltaic inverters solve harmonics and voltage fluctuation problems, distributed energy storage converters solve harmonics, voltage fluctuations and three-phase imbalance problems, and electric vehicle charging converters solve harmonics and voltage fluctuation problems; for the source-grid-load power electronic devices, according to their own characteristics and software and hardware conditions, the types of power quality problems it can solve are marked, including: APF solves harmonics, SVG solves voltage fluctuations, and medium voltage equipment solves harmonics and voltage fluctuations. Calculate the ideal available capacity of each power electronic device based on its rated capacity and current operating status; Calculate the actual available capacity of each power electronic device based on its ideal available capacity and current operating status, combined with the impedance, grid connection requirements, and power loss in the power quality management process; Based on the power quality problem control type and actual available capacity of each power electronic device, the adjustable potential of each power electronic device is obtained. The adjustable potential refers to the maximum adjustment capability that can be provided according to different types of power quality problems under current operating conditions.

2. The method according to claim 1, characterized in that For the power quality control equipment, the calculation of the actual available capacity of each power electronic device includes: Read the rated capacity and current operating status of each power quality management equipment, and calculate the ideal available capacity of each power grid load power electronic device; Based on the ideal available capacity and current operating status of each power quality control equipment, combined with the impedance between the equipment and the point to be controlled, the energy loss in the power quality control process is calculated to obtain the actual available capacity of each power quality control equipment.

3. The method according to claim 1, characterized in that For the source-grid-load power electronic devices, the calculating of the actual available capacity of each power electronic device includes: Read the rated capacity and current operating status of each source grid load power electronic device, and calculate the ideal available capacity of each source grid load power electronic device; Based on the ideal available capacity and current operating status of each source, grid and load power electronic device, combined with the grid connection requirements and power losses in the management process of the electronic device, the actual available capacity of each source, grid and load power electronic device is calculated.

4. A device for evaluating the power quality control potential of a power electronic device in a distribution network, characterized in that: include: The classification and labeling module is used to read the types of power electronic devices in the distribution network, divide them into power quality special management equipment and source-grid-load power electronic devices, and label the types of power quality control problems that they can solve respectively, including: reading the types of power electronic devices in the distribution network, dividing them into power quality special management equipment and source-grid-load power electronic devices, among which, for the distribution network scenario including photovoltaic inverters, distributed energy storage converters, electric vehicle charging converters, static VAR generators SVG, active power filters APF and medium voltage equipment, photovoltaic inverters, distributed energy storage converters, electric vehicle charging converters are divided into power quality special management equipment, and APF, A PG and medium-voltage equipment are divided into source-grid-load power electronic devices; for the power quality-specific management equipment, according to its own adjustment function, mark the type of power quality problem regulation it can solve, including: photovoltaic inverter solves harmonic and voltage fluctuation problems, distributed energy storage converter solves harmonic problems, voltage fluctuation problems and three-phase imbalance problems, electric vehicle charging converter solves harmonic and voltage fluctuation problems; for the source-grid-load power electronic devices, according to its own characteristics and software and hardware conditions, mark the type of power quality problem regulation it can solve, including: APF solves harmonic problems, SVG solves voltage fluctuation problems, and medium-voltage equipment solves harmonic and voltage fluctuation problems; An ideal available capacity calculation module is used to calculate the ideal available capacity of each power electronic device based on the rated capacity and current operating status of each power electronic device; The actual available capacity calculation module calculates the actual available capacity of each power electronic device based on its ideal available capacity and current operating status, combined with the impedance, grid connection requirements and power loss in the power quality management process; The potential calculation module is used to obtain the adjustable potential of each power electronic device based on the power quality problem control type and actual available capacity of each power electronic device. The adjustable potential refers to the maximum adjustment capacity that can be provided according to different types of power quality problems under current operating conditions.

5. An electronic device, characterized in that: include: a processor, and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the method according to any one of claims 1 to 3.

6. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer-executable instructions, which are used to implement the method according to any one of claims 1 to 3 when executed by a processor.

7. A computer program product, characterized in that The invention comprises a computer program, which implements the method according to any one of claims 1 to 3 when executed by a processor.

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