Method for evaluating electric energy quality regulation potential of power electronic device of power distribution network

Abstract

The invention provides a power distribution network power electronic device electric energy quality regulation and control potential evaluation method, which comprises the steps of reading the types of power electronic devices in a power distribution network, dividing the power electronic devices into special electric energy quality treatment equipment and source network load power electronic devices, and marking electric energy quality problem regulation and control types which can be solved by the special electric energy quality treatment equipment and the source network load power electronic devices respectively; calculating an ideal available capacity according to the rated capacity and the current operation state of each power electronic device; according to the ideal available capacity and the current operation state, the actual available capacity of each power electronic device is calculated in combination with impedance, grid-connected requirement limitation and power loss existing in the electric energy quality treatment process; and obtaining adjustable potential based on the electric energy quality problem regulation type and the actual available capacity of each power electronic device. The method fully considers the adjustment potential of mining source / network / load side distributed resources and traditional electric energy quality special equipment, and effectively achieves the accurate mining of the multi-type equipment regulation potential under the 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] The greening of energy supply for the "dual carbon" goal and the high-quality energy consumption for industrial transformation and upgrading are the core strategic needs of my country's current energy revolution and development. The proportion of renewable energy power generation installed capacity in my country has historically exceeded that of fossil energy power generation installed capacity. Distributed photovoltaics connected to the power distribution system have reached 40.2% of the total photovoltaic installed capacity, and the electricity consumption of industrial users nationwide accounts for 64.8% of the total electricity consumption in the society. 95% of the complaints and reports received by the National Energy Administration each year are against the power industry, among which power quality issues rank first. The economic losses caused by renewable energy power generation abandonment and enterprise shutdown and poor production due to power quality issues in the country amount to hundreds of billions of yuan each year. Therefore, the power quality of the power distribution system with a high proportion of renewable energy is the key to promoting the consumption of renewable energy and ensuring the high-quality development of the industry.

[0003] In order to solve the power quality problems in power distribution systems with a high proportion of renewable energy, domestic and foreign researchers have proposed a variety of solutions, but they mainly rely on the installation of special 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 made full use of the characteristics and advantages of active and passive components and proposed a variety of "active + passive" hybrid power quality management equipment. However, the existing special management equipment can only solve specific power quality problems, and the equipment has been idle for a long time with low utilization rate. It is difficult to improve the overall power quality of the "double high" power distribution system by installing a large number of special equipment, and it faces prominent problems such as high cost and low equipment utilization rate.

[0004] Compared with the large-scale addition of power quality-specific equipment, the number of distributed resources on the source / grid / load side of the high-proportion renewable energy distribution and utilization system is large, and the regulation potential is large. Therefore, fully exploring the regulation potential of distributed resources on the source / grid / load side and traditional power quality-specific equipment is an effective means to achieve low-cost dual-high distribution network power quality management. However, the equipment characteristics of distributed resources on the source / grid / load side are different, and the working conditions are complex, making it difficult to accurately explore the regulation potential.

[0005] In summary, as the proportion of power electronic equipment increases, it is urgent to explore the potential of existing power electronics in power quality management. However, power electronic equipment has different characteristics and complex working conditions. How to accurately explore the potential of regulation is the key to using power electronic equipment to participate in power quality management. Summary of the invention

[0006] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0007] To this end, the first purpose of the present 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.

[0008] 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.

[0009] The third objective of the present application is to provide an electronic device.

[0010] A fourth objective of the present application is to provide a computer-readable storage medium.

[0011] A fifth object of the present application is to provide a computer program product.

[0012] To achieve the above-mentioned purpose, 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:

[0013] 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 that they can solve respectively;

[0014] Calculate the ideal available capacity of each power electronic device based on its rated capacity and current operating status;

[0015] According to 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 respectively;

[0016] 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.

[0017] Optionally, the reading of the types of power electronic devices in the distribution network, dividing them into power quality dedicated management equipment and source-grid-load power electronic devices, and marking the types of power quality problem control that can be solved by them respectively, also includes:

[0018] Read the types of power electronic devices in the distribution network and divide them into power quality dedicated management equipment and source-grid-load power electronic devices. For distribution network scenarios 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 and electric vehicle charging converters are divided into power quality dedicated management equipment, and APF, APG and medium-voltage equipment are divided into source-grid-load power electronic devices;

[0019] For the power quality control equipment, according to its own adjustment function, mark the types of power quality problems that 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;

[0020] 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 that 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.

[0021] Optionally, for the power quality dedicated management equipment, the calculating the actual available capacity of each power electronic device includes:

[0022] 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;

[0023] Based on the ideal available capacity and current operating status of each power quality management equipment, combined with the impedance between the equipment and the point to be managed, the energy loss in the power quality management process is calculated to obtain the actual available capacity of each power quality management equipment.

[0024] Optionally, for the source-grid-load power electronic devices, the calculating the actual available capacity of each power electronic device includes:

[0025] 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;

[0026] Based on the ideal available capacity and current operating status of each source, grid and load power electronic device, combined with the grid-connected requirements and restrictions of the electronic device and the power loss in the governance process, the actual available capacity of each source, grid and load power electronic device is calculated.

[0027] To achieve the above-mentioned purpose, the second embodiment of the present application proposes a device for evaluating the power quality control potential of a power electronic device in a distribution network, comprising:

[0028] The classification and labeling module is used to read the types of power electronic devices in the distribution network, classify them into power quality special management equipment and source-grid-load power electronic devices, and label the types of power quality control that can be solved by each of them;

[0029] An ideal available capacity calculation module is used to calculate the ideal available capacity of each power electronic device according to the rated capacity and current operating state of each power electronic device;

[0030] The actual available capacity calculation module 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 requirement restrictions and power loss in the power quality management process;

[0031] 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 the actual available capacity of each power electronic device.

[0032] To achieve the above-mentioned purpose, the third aspect of the present application provides an electronic device, including: a processor, and a memory communicatively connected to the processor;

[0033] The memory stores computer-executable instructions;

[0034] The processor executes the computer-executable instructions stored in the memory to implement the method as described in any one of the first aspects.

[0035] To achieve the above-mentioned purpose, the fourth aspect embodiment of the present application proposes a computer-readable storage medium, in which computer-readable storage medium is stored computer execution instructions, and when the computer execution instructions are executed by a processor, they are used to implement the method as described in any one of the first aspects.

[0036] To achieve the above-mentioned purpose, the fifth aspect of the present application proposes a computer program product, which implements any method in the first aspect when executed by a processor.

[0037] The technical solution provided by the embodiments of the present application brings at least the following beneficial effects:

[0038] First, this application effectively marks the types of control of power quality problems of power electronic devices, sorts out the power quality problems that can be controlled by each power electronic device in the dual-high power distribution network, and broadens the control types of each source-grid-load power electronic device compared with the existing methods;

[0039] Second, this application fully considers exploring 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.

[0040] 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 the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] 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:

[0042] Figure 1 A flow chart of a method for evaluating the power quality control potential of a power electronic device in a distribution network provided in an embodiment of the present application;

[0043] Figure 2 A schematic diagram of a judgment flow of a method for evaluating the power quality control potential of a power electronic device in a distribution network provided in an embodiment of the present application;

[0044] Figure 3 A schematic diagram of a dual-high power distribution network in a certain scenario provided by an embodiment of the present application;

[0045] Figure 4 A flowchart of a power quality problem regulation type labeling process provided in an embodiment of the present application;

[0046] Figure 5 A schematic diagram of a photovoltaic power source reactive power regulation range under a standard constant reactive power regulation range in a certain scenario provided by an embodiment of the present application;

[0047] 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;

[0048] 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;

[0049] Figure 8 A schematic diagram of photovoltaic operation in other reactive power control modes in a dual-high power distribution network of multiple types of source-grid-load converters in another scenario provided by an embodiment of the present application;

[0050] Fig. 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

[0051] Embodiments of the present application are described in detail below, and examples of the embodiments 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.

[0052] The greening of energy supply for the "dual carbon" goal and the high-quality energy consumption for industrial transformation and upgrading are the core strategic needs of my country's current energy revolution and development. The proportion of renewable energy power generation installed capacity in my country has historically exceeded that of fossil energy power generation installed capacity. Distributed photovoltaics connected to the power distribution system have reached 40.2% of the total photovoltaic installed capacity, and the electricity consumption of industrial users nationwide accounts for 64.8% of the total electricity consumption in the society. 95% of the complaints and reports received by the National Energy Administration each year are against the power industry, among which power quality issues rank first. The economic losses caused by renewable energy power generation abandonment and enterprise shutdown and poor production due to power quality issues in the country amount to hundreds of billions of yuan each year. Therefore, the power quality of the power distribution system with a high proportion of renewable energy is the key to promoting the consumption of renewable energy and ensuring the high-quality development of the industry.

[0053] In order to solve the power quality problems in power distribution systems with a high proportion of renewable energy, domestic and foreign researchers have proposed a variety of solutions, but they mainly rely on the installation of special 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 made full use of the characteristics and advantages of active and passive components and proposed a variety of "active + passive" hybrid power quality management equipment. However, the existing special management equipment can only solve specific power quality problems, and the equipment has been idle for a long time with low utilization rate. It is difficult to improve the overall power quality of the "double high" power distribution system by installing a large number of special equipment, and it faces prominent problems such as high cost and low equipment utilization rate.

[0054] Compared with the large-scale addition of power quality-specific equipment, the number of distributed resources on the source / grid / load side of the high-proportion renewable energy distribution and utilization system is large, and the regulation potential is large. Therefore, fully exploring the regulation potential of distributed resources on the source / grid / load side and traditional power quality-specific equipment is an effective means to achieve low-cost dual-high distribution network power quality management. However, the equipment characteristics of distributed resources on the source / grid / load side are different, and the working conditions are complex, making it difficult to accurately explore the regulation potential.

[0055] In summary, as the proportion of power electronic equipment increases, it is urgent to explore the potential of existing power electronics in power quality management. However, power electronic equipment has different characteristics and complex working conditions. How to accurately explore the potential of regulation is the key to using power electronic equipment to participate in power quality management.

[0056] To address this problem, an embodiment of the present application provides a method for evaluating the power quality control potential of a power electronic device 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 a power electronic device in a distribution network provided in an embodiment of the present application.

[0057] like Figure 1 As shown, the method comprises the following steps:

[0058] Step 101, 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 problem control that they can solve respectively.

[0059] 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.

[0060] In one embodiment, for Figure 3 In the double-high 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.

[0061] Classify according to the following classification rules:

[0062] Special power quality management equipment: photovoltaic inverters, distributed energy storage converters, electric vehicle charging converters;

[0063] Source-grid-load power electronic devices: APF, APG, medium voltage equipment.

[0064] Further, in the embodiments of the present application, Figure 4 As shown, for the special power quality 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 and load power electronic devices, according to their own characteristics and software and hardware conditions, the type of power quality problem control it can solve is marked.

[0065] 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.

[0066] Specifically, photovoltaic inverters are mainly used to solve harmonic problems and voltage fluctuation problems. By optimizing the waveform of the output current and stabilizing the voltage output, photovoltaic inverters can effectively reduce the harmonic content and stabilize the grid voltage.

[0067] Distributed energy storage inverters can solve harmonic problems, voltage fluctuation problems and three-phase imbalance problems. Energy storage inverters can not only provide harmonic suppression function, 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.

[0068] Electric vehicle charging converters are used to suppress harmonics and alleviate voltage fluctuations. Harmonics are easily generated during the charging process of electric vehicles. Charging converters can adjust the waveform of the charging current, reduce harmonics, and play a certain role in compensating for grid voltage fluctuations.

[0069] APF is specially used to dynamically compensate for harmonic problems. APF can monitor and suppress harmonic components in the power grid in real time, improve the current waveform, and thus reduce the interference of harmonics on the power grid and electrical equipment.

[0070] SVG is mainly used to solve the problem of voltage fluctuation. SVG can quickly respond to voltage changes and provide reactive power support to balance and stabilize the voltage level of the power grid.

[0071] Medium voltage equipment is used to solve harmonic problems and voltage fluctuation problems. Medium voltage equipment usually has powerful reactive power compensation and harmonic filtering capabilities, which can effectively suppress harmonics in the medium voltage power grid and stabilize the voltage.

[0072] 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.

[0073] 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.

[0074] 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 a photovoltaic power source under standard constant reactive power regulation range is shown.

[0075] According to GB / T 19964-2012 "Technical Regulations for Photovoltaic Power Generation Stations Connected to Power Systems", the reactive power of the grid-connected photovoltaic inverter must meet the power factor dynamically adjustable within the range of 0.95 leading to 0.95 lagging. Combined with the power factor limit, the reactive power range of the photovoltaic power source can be calculated according to the following formula:

[0076]

[0077] Among them, Q PV is the photovoltaic reactive power, P PV is the photovoltaic active power, C PV is the photovoltaic installed capacity, and cos(θ) is the power factor.

[0078] When Figure 6 As shown, under no light conditions, P PV With C PV is zero, so the reactive power regulation range of the photovoltaic power source can be obtained as:

[0079]

[0080] 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.

[0081] Distributed energy storage has the ability to operate flexibly in four quadrants. According to GB / T 36552-2018 "Technical Regulations for Energy Storage System Access to Power System", grid-connected energy storage inverters are required to implement constant power control, constant power factor control and constant current control. If controlled with a constant power factor, the reactive power adjustment range can be determined according to the following formula:

[0082]

[0083] 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(θ) is the power factor. And:

[0084]

[0085] Therefore, under the constant power factor (0.95) operation mode, the maximum reactive power of distributed photovoltaic and distributed energy storage is 0.31 times its installed capacity.

[0086] Similarly, according to a similar method, it can be calculated that the maximum reactive power that electric vehicle charging inverters and medium voltage equipment can provide is 0.31 times their installed capacity. SVG is a device that specializes in reactive power compensation, and its reactive power adjustment range is determined by the installed reactive power capacity. APF is a device used to dynamically compensate for harmonics and reactive power, and its reactive power compensation capacity is determined by the installed capacity.

[0087] 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 IEEE33-node system when the power factor is 0.95 can be estimated as:

[0088]

[0089] Among them, ξ PV,i =ξ ESS,i =ξ Ch,i =ξ SOP,i =0.31, which are the reactive power compensation coefficients of photovoltaic inverter, distributed energy storage converter, electric vehicle charging converter and medium voltage equipment respectively

[0090] This formula comprehensively considers the reactive power compensation capability of various power electronic devices under constant power factor (0.95) conditions. By summing up the reactive power capacity of different power electronic devices, the maximum reactive power compensation power of the system under such conditions is obtained.

[0091] in addition, Figure 8 A schematic diagram of photovoltaic operation in other reactive power control modes in a dual-high 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 work in a variety of flexible control modes, and its potential evaluation method is similar to Figure 3 The embodiments shown are similar.

[0092] Step 103, according to 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 respectively.

[0093] It is understandable that during the power transmission process between the power electronic device and the point to be treated, energy loss will be caused by the resistance and reactance of the line. Specifically, when the current passes through the line between the power electronic device and the point to be treated, power loss will occur due to the existence of impedance. This part of energy loss is mainly determined by the output current of the device and the impedance of the line.

[0094] 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.

[0095] In the present application, refer to Figure 2 For each power quality management equipment, based on the ideal available capacity and current operating status of each power quality management equipment, combined with the impedance between the equipment and the point to be managed, the energy loss in the power quality management process is calculated to obtain the actual available capacity of each power quality management equipment.

[0096] 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 losses existing in the governance process.

[0097] 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 management 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.

[0098] Step 104 : obtaining the adjustable potential of each power electronic device based on the power quality problem regulation type and the actual available capacity of each power electronic device.

[0099] It can be understood that the adjustable potential of each power electronic device refers to the maximum adjustment capability that it can provide under the current operating conditions according to different types of power quality problems (such as harmonic control, voltage fluctuation compensation and reactive power compensation, etc.).

[0100] Finally, the actual available capacity is mapped to the regulation type of each power electronic device to obtain the adjustable potential of the power electronic device under a specific power quality problem. For example, if the regulation type of the device is reactive power compensation, its adjustable potential is the reactive power part of its actual available capacity.

[0101] In order to implement the above-mentioned embodiment, the present application also proposes a device for evaluating the power quality control potential of a power electronic device in a distribution network. Fig. 9 The present invention provides a schematic diagram of a power quality control potential assessment device 10 for power electronic devices in a distribution network. Fig. 9 As shown, the device comprises:

[0102] 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 problems that can be solved by them respectively;

[0103] 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 state of each power electronic device;

[0104] The actual available capacity calculation module 300 calculates the actual available capacity of each power electronic device according to the ideal available capacity and current operating state of each power electronic device, combined with the impedance, grid connection requirement restrictions and power loss in the power quality management process;

[0105] 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 the actual available capacity of each power electronic device.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] It should be noted that personal information from users should be collected for legitimate and reasonable purposes and should not be shared or sold outside of these legitimate uses. In addition, such collection / sharing should be carried out after receiving the user's informed consent, including but not limited to notifying the user to read the user agreement / user notice and sign the agreement / authorization including authorization of relevant user information before the user uses the function. In addition, any necessary steps should be taken to protect and safeguard access to such personal information data and ensure that others who have access to personal information data comply with its privacy policy and procedures.

[0111] The present application is expected to provide an implementation scheme for users to selectively block the use or access of personal information data. That is, the present disclosure is expected to provide hardware and / or software to prevent or block access to such personal information data. Once the personal information data is no longer needed, the risk can be minimized by limiting data collection and deleting the data. In addition, when applicable, such personal information is de-identified to protect the privacy of the user.

[0112] In the description of the aforementioned embodiments, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means 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 representations 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 the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0113] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0114] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment 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 not be performed in 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 technicians in the technical field to which the embodiments of the present application belong.

[0115] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, 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 in other suitable ways if necessary, and then stored in a computer memory.

[0116] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0117] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0118] In addition, each functional unit in each embodiment 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 one 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.

[0119] 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 can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

[0120] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this application can be executed in parallel, sequentially or in different orders, as long as the expected results of the technical solution of this application can be achieved, and this document is not limited here.

[0121] The above specific implementations do not constitute a limitation on the protection scope of this application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this application should be included in the protection scope 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 dedicated management equipment and source-grid-load power electronic devices, and mark the types of power quality control problems that they can solve respectively; Calculate the ideal available capacity of each power electronic device based on its rated capacity and current operating status; According to 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 respectively; 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.

2. The method according to claim 1, characterized in that The reading of the types of power electronic devices in the distribution network, dividing them into power quality dedicated management equipment and source-grid-load power electronic devices, and marking the types of power quality problem regulation that can be solved by them respectively, also includes: Read the types of power electronic devices in the distribution network and divide them into power quality dedicated management equipment and source-grid-load power electronic devices. For distribution network scenarios 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 and electric vehicle charging converters are divided into power quality dedicated management equipment, and APF, APG and medium-voltage equipment are divided into source-grid-load power electronic devices; For the power quality control equipment, according to its own adjustment function, mark the types of power quality problems that 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 their own characteristics and software and hardware conditions, the types of power quality control problems that 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.

3. The method according to claim 2, characterized in that For the power quality control equipment, the actual available capacity of each power electronic device is calculated, including: 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 management equipment, combined with the impedance between the equipment and the point to be managed, the energy loss in the power quality management process is calculated to obtain the actual available capacity of each power quality management equipment.

4. The method according to claim 2, 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-connected requirements and restrictions of the electronic device and the power loss in the governance process, the actual available capacity of each source, grid and load power electronic device is calculated.

5. 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, classify them into power quality special management equipment and source-grid-load power electronic devices, and label the types of power quality control that can be solved by each of them; An ideal available capacity calculation module is used to calculate the ideal available capacity of each power electronic device according to the rated capacity and current operating state of each power electronic device; The actual available capacity calculation module 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 requirement restrictions 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 the actual available capacity of each power electronic device.

6. 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 4.

7. 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 4 when executed by a processor.

8. 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 4 when being executed by a processor.

Images