Method and device for assessing the responsibility of the access of a device to the quality of the electrical energy

Abstract

The application provides a kind of method and device for evaluating the responsibility of equipment access to power quality influence quantification analysis, and relates to the technical field of new energy.The method comprises: determining the target equipment to be evaluated and the selected target power quality influence index;According to the position relationship of the equipment access node and each active distribution network other node relative to the distribution network transformer node, determine the target power quality influence index value set of the equipment access node to each active distribution network other node;The ratio of the sum of all target power quality influence index values to the total number of active distribution network other nodes is used as the power quality responsibility quantification result of the evaluated target equipment.The device executes the above method.The method and device provided by the embodiment of the application can quickly and accurately analyze the responsibility of different position distributed new energy equipment access to power quality influence in distribution network and easily quantify.

Description

Technical Field

[0001] The present invention relates to the field of new energy technology, and in particular to a responsibility quantification analysis method and device for evaluating the impact of device access on power quality. Background Art

[0002] At present, distributed new energy equipment is widely connected to the low-voltage distribution network, which has brought about great changes to the operating status of the low-voltage distribution network. The traditional low-voltage distribution network with one-way power flow has gradually evolved into a new active distribution network with complex active power intermittent and power flow reverse transmission characteristics, which in turn has caused power quality problems different from traditional networks. In order to achieve effective regulation and management of the power quality of the new active distribution network, it is of great practical significance to evaluate the impact of equipment access location and capacity on power quality. However, traditional power quality responsibility quantitative analysis mostly focuses on harmonic sources, and does not pay attention to the most critical voltage limit problem in actual scenarios. In addition, the algorithm is complex to implement and highly dependent on distribution network data, which is not conducive to its widespread application in active distribution networks. Summary of the Invention

[0003] In response to the problems in the prior art, embodiments of the present invention provide a responsibility quantification analysis method and apparatus for evaluating the impact of device access on power quality, which can at least partially solve the problems in the prior art.

[0004] In one aspect, the present invention proposes a responsibility quantification analysis method for evaluating the impact of device access on power quality, comprising:

[0005] Determine the target equipment to be evaluated and the target power quality impact indicators to be selected;

[0006] Determine a target power quality impact indicator value set of the device access node on each other node of the active distribution network based on the positional relationship between the device access node and each other node of the active distribution network relative to the transformer node of the distribution network station area;

[0007] The ratio of the sum of all target power quality impact index values ​​to the total number of other nodes in the active distribution network is used as a quantitative result of evaluating the power quality responsibility of the target device to be evaluated.

[0008] Determining the target power quality impact indicator includes:

[0009] Determine the power quality model with the equipment access capacity as the independent variable corresponding to the voltage deviation, third current harmonic, fifth current harmonic, voltage distortion rate and voltage three-phase unbalance respectively;

[0010] For each power quality model, the output active power of the distributed new energy equipment is derived to obtain the power quality impact indicators corresponding to the voltage deviation, third current harmonic, fifth current harmonic, voltage distortion rate and voltage three-phase imbalance.

[0011] One of the power quality impact indicators is selected to obtain the target power quality impact indicator.

[0012] Among them, determining the position relationship between the equipment access node and each other node of the active distribution network relative to the transformer node of the distribution network station area includes:

[0013] The positional relationship between the equipment access node and other nodes of each active distribution network relative to the transformer node of the distribution network substation is determined based on the pre-established distribution network circuit model.

[0014] Wherein, determining the target power quality impact indicator value set of the device access node on each other node of the active distribution network based on the positional relationship between the device access node and each other node of the active distribution network relative to the distribution network station transformer node includes:

[0015] The relative position relationship between each other node of the active distribution network and the device access node is traversed one by one. If it is determined that the current traversal node and the device access node are in the same branch of the active distribution network, and the first line distance between the device access node and the distribution network substation transformer node is greater than the second line distance between the current traversal node and the distribution network substation transformer node, the target power quality impact index value of the current traversal node is added to the target power quality impact index value set.

[0016] The method for quantitatively analyzing the impact of device access on power quality also includes:

[0017] If it is determined that the current traversal node and the device access node are in the same branch of the active distribution network, and the first line distance between the device access node and the distribution network substation transformer node is less than the second line distance between the current traversal node and the distribution network substation transformer node, then the target power quality impact index value of the device access node is added to the target power quality impact index value set.

[0018] The method for quantitatively analyzing the impact of device access on power quality also includes:

[0019] If it is determined that the current traversal node and the device access node are in different branches of the active power distribution network, the confluence node of the two different branches is found, and the target power quality impact index value of the confluence node is added to the target power quality impact index value set.

[0020] The method for quantitatively analyzing the impact of device access on power quality also includes:

[0021] The target power quality impact indicator value set is represented by constructing a power quality responsibility quantization matrix.

[0022] In one aspect, the present invention provides a responsibility quantification analysis device for evaluating the impact of device access on power quality, comprising:

[0023] A first determining unit is used to determine the target equipment to be evaluated and the selected target power quality impact index;

[0024] A second determining unit is configured to determine a target power quality impact indicator value set of the device access node on each other node of the active distribution network based on a positional relationship between the device access node and each other node of the active distribution network relative to the transformer node of the distribution network station area;

[0025] The evaluation unit is configured to use the ratio of the sum of all target power quality impact index values ​​to the total number of other nodes in the active distribution network as a quantitative result of evaluating the power quality responsibility of the target device to be evaluated.

[0026] On the other hand, an embodiment of the present invention provides an electronic device, comprising: a processor, a memory, and a bus, wherein:

[0027] The processor and the memory communicate with each other via the bus;

[0028] The memory stores program instructions that can be executed by the processor, and the processor calls the program instructions to execute the following method:

[0029] Determine the target equipment to be evaluated and the target power quality impact indicators to be selected;

[0030] Determine a target power quality impact indicator value set of the device access node on each other node of the active distribution network based on the positional relationship between the device access node and each other node of the active distribution network relative to the transformer node of the distribution network station area;

[0031] The ratio of the sum of all target power quality impact index values ​​to the total number of other nodes in the active distribution network is used as a quantitative result of evaluating the power quality responsibility of the target device to be evaluated.

[0032] An embodiment of the present invention provides a non-transitory computer-readable storage medium, including:

[0033] The non-transitory computer-readable storage medium stores computer instructions, which cause the computer to execute the following method:

[0034] Determine the target equipment to be evaluated and the target power quality impact indicators to be selected;

[0035] Determine a target power quality impact indicator value set of the device access node on each other node of the active distribution network based on the positional relationship between the device access node and each other node of the active distribution network relative to the transformer node of the distribution network station area;

[0036] The ratio of the sum of all target power quality impact index values ​​to the total number of other nodes in the active distribution network is used as a quantitative result of evaluating the power quality responsibility of the target device to be evaluated.

[0037] The embodiment of the present invention provides a method and device for quantitatively analyzing the impact of device access on power quality, which determines the target device to be evaluated and the selected target power quality impact index; determines the target power quality impact index value set of the device access node on each other node of the active distribution network based on the positional relationship between the device access node and each other node of the active distribution network relative to the transformer node of the distribution network substation; and uses the ratio of the sum of all target power quality impact index values ​​to the total number of other nodes of the active distribution network as the power quality responsibility quantification result of evaluating the target device to be evaluated. This method can quickly and relatively accurately analyze the impact of distributed new energy equipment at different locations in the distribution network on power quality and is easy to quantify. It requires less data than existing methods and is simpler to calculate than existing methods, which is conducive to engineering implementation. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0039] Figure 1 The present invention provides a flowchart of a method for quantitatively analyzing the impact of device access on power quality, as provided in one embodiment of the present invention.

[0040] Figure 2 This is a schematic diagram illustrating a distribution network circuit model provided by an embodiment of the present invention.

[0041] Figure 3 It is a structural diagram of a device for quantitatively analyzing the impact of access of an assessment device on power quality provided by one embodiment of the present invention.

[0042] Figure 4 A schematic diagram of the physical structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0043] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of this application can be combined with each other in any manner.

[0044] Terminology Notes:

[0045] Active distribution network: An active distribution network is a distribution network that comprehensively controls distributed energy (distributed power sources, energy storage devices, and flexible loads).

[0046] Quantification of power quality responsibility: Quantification of power quality responsibility refers to analyzing the impact of the connection of new energy equipment on the power quality of the distribution network and quantitatively evaluating the impact.

[0047] Figure 1 FIG. 1 is a flow chart of a method for quantitatively analyzing the impact of device access on power quality according to an embodiment of the present invention. Figure 1 As shown, the embodiment of the present invention provides a responsibility quantification analysis method for evaluating the impact of device access on power quality, including:

[0048] Step S1: Determine the target equipment to be evaluated and the target power quality impact indicator to be selected.

[0049] Step S2: Determine a target power quality impact index value set of the device access node on each other active distribution network node based on the positional relationship between the device access node and each other active distribution network node relative to the distribution network substation transformer node.

[0050] Step S3: taking the ratio of the sum of all target power quality impact index values ​​to the total number of other nodes in the active distribution network as a quantified result of evaluating the power quality responsibility of the target device to be evaluated.

[0051] In step S1, the apparatus determines the target device to be evaluated and the target power quality impact indicator to be selected. The apparatus may be a computer device that executes the method, such as a server. It should be noted that the acquisition and analysis of data in this embodiment of the present invention is authorized by the user.

[0052] In the above step S2, the device determines the target power quality impact indicator value set of the device access node on each other node of the active distribution network based on the position relationship between the device access node and each other node of the active distribution network relative to the distribution network substation transformer node.

[0053] In the above step S3, the device uses the ratio of the sum of all target power quality impact index values ​​to the total number of other nodes in the active distribution network as the power quality responsibility quantification result of evaluating the target device to be evaluated. The target device to be evaluated includes the device access node.

[0054] Determining the target power quality impact index includes:

[0055] Determine the power quality model with the equipment access capacity as the independent variable corresponding to the voltage deviation, third current harmonic, fifth current harmonic, voltage distortion rate and voltage three-phase unbalance respectively; such as Figure 2 As shown, the transformer node in the distribution network area is considered to be an ideal voltage source, and its voltage is expressed as U N , representing the standard value of the distribution network voltage. R f is the equivalent resistance from the device access node to the transformer node, X f is the equivalent reactance from the device access node to the transformer node, I f It is the equivalent current from the device access node to the transformer node.

[0056] Define the node voltage before the device sends power as , and after the power is sent as . According to the circuit theorem, the equation can be listed as:

[0057] U after =U before +I f (R f +jX f )

[0058] Among them, I f It can be expressed as:

[0059]

[0060] Among them, P out is the active power output by the new energy equipment, Q out is the reactive power output by the new energy equipment, and g is the correction factor added to consider the load distribution of the distribution network and the power output of other new energy equipment.

[0061] According to the voltage deviation definition:

[0062]

[0063] The power-voltage deviation model formula is derived as follows:

[0064]

[0065] Define two variables α and β. Different values ​​of these variables represent different control strategies for the inverter device. Their specific values ​​are shown in Table 1:

[0066] Table 1

[0067] Control strategy α β Instantaneous power factor control 1 1 Average power factor control 1 0 Instantaneous positive sequence control 0 1 Average positive sequence control 0 0 Positive and negative sequence compensation control -1 1

[0068] Finally, the power-current harmonic model is obtained:

[0069]

[0070]

[0071] Among them, A=β(1+αn), B=1+αn 2 , I 3th , I 5th Respectively represent the third and fifth harmonic current amplitudes after the output power of the equipment, I 3thb , I 5thb They represent the amplitudes of the third and fifth harmonic currents before the equipment output power, respectively, and n is the imbalance of the grid voltage before the grid-connected equipment outputs power.

[0072] The output power-voltage distortion rate model is derived:

[0073]

[0074] Considering the most likely imbalance in an actual distribution network, we assume that the imbalance is caused by single-phase power access to the grid. Here, we assume that phase A is connected to the converter to transmit power to the grid, causing a single-phase voltage deviation, while the other two phases remain unchanged. Finally, we establish an output power-three-phase imbalance model:

[0075]

[0076] Among them, U a_before U is the voltage on one phase of the output power of the grid-connected device before the grid-connected device outputs power at the access node. b_before 、U c_before It is the voltage on the other two phases of the access node before the grid-connected device outputs power, except for the one phase where the grid-connected device outputs power.

[0077] The output active power of distributed renewable energy equipment is derived from each power quality model to obtain the power quality impact indicators corresponding to voltage deviation, third current harmonic, fifth current harmonic, voltage distortion rate, and voltage three-phase imbalance. Considering that most power quality problems in low-voltage distribution networks are caused by the output active power of equipment, the output active power of distributed renewable energy equipment is derived from each power quality model. The expressions are as follows:

[0078]

[0079]

[0080]

[0081]

[0082]

[0083] One of the power quality impact indicators is selected to obtain the target power quality impact indicator.

[0084] The position relationship between the equipment access node and each other node of the active distribution network relative to the transformer node of the distribution network station is determined based on the pre-established distribution network circuit model. Figure 2 Not shown.

[0085] The determining of a target power quality impact indicator value set of the device access node on each other node of the active distribution network based on a positional relationship between the device access node and each other node of the active distribution network relative to a transformer node in a distribution network station area includes:

[0086] The relative positional relationship between each other node of the active distribution network and the device access node is traversed one by one. If it is determined that the current traversal node and the device access node are in the same branch of the active distribution network, and the first line distance between the device access node and the distribution network substation transformer node is greater than the second line distance between the current traversal node and the distribution network substation transformer node, the target power quality impact index value of the current traversal node is added to the target power quality impact index value set. That is, for nodes in the same branch of the distribution network, if the device access node is located after the evaluation node relative to the substation transformer node, then the power quality impact index value of the access device on the evaluation node is equivalent to the power quality impact index value of the device access evaluation node.

[0087] The method for quantitatively analyzing the impact of device access on power quality further includes:

[0088] If it is determined that the current traversal node and the device access node are in the same branch of the active power distribution network, and the first line distance between the device access node and the distribution network substation transformer node is less than the second line distance between the current traversal node and the distribution network substation transformer node, then the target power quality impact index value of the device access node is added to the target power quality impact index value set. That is, for nodes in the same branch of the distribution network, if the device access node is located before the evaluation node relative to the substation transformer node, then the power quality impact index value of the access device on the evaluation node is equal to the power quality impact index value of the device access node.

[0089] The method for quantitatively analyzing the impact of device access on power quality further includes:

[0090] If it is determined that the current traversal node and the device access node are in different branches of the active power distribution network, the confluence node of the two different branches is found, and the target power quality impact index value of the confluence node is added to the target power quality impact index value set. The power quality responsibility quantification matrix A can be constructed according to the label of each node, and the matrix element a in the matrix ij The output power of the device connected to node j affects a certain power quality indicator value of node i.

[0091]

[0092] For example, if we select node 1 as the target device to be evaluated and voltage deviation as the target power quality impact indicator, we can calculate the overall impact of the device output power on the distribution network area by constructing the following calculation formula:

[0093]

[0094] η1 represents the quantitative degree of responsibility of the device output power at node 1 for the overall impact of the voltage deviation index in the distribution network substation. The larger the value, the greater the responsibility of its power output for the substation voltage deviation problem. This can quantitatively evaluate the responsibility of the device access location and capacity for the power quality problem of the distribution network.

[0095] The embodiment of the present invention provides a responsibility quantification analysis method for evaluating the impact of device access on power quality, which determines the target device to be evaluated and the selected target power quality impact index; determines the target power quality impact index value set of the device access node on each other node of the active distribution network based on the position relationship between the device access node and each other node of the active distribution network relative to the transformer node of the distribution network substation; and uses the ratio of the sum of all target power quality impact index values ​​to the total number of other nodes of the active distribution network as the power quality responsibility quantification result of evaluating the target device to be evaluated. The method can quickly and relatively accurately analyze the responsibility of distributed new energy equipment at different locations in the distribution network for the impact on power quality and is easy to quantify. The data requirement is less than that of the existing method, the calculation difficulty is simpler than that of the existing method, and it is conducive to engineering implementation.

[0096] Furthermore, determining the target power quality impact index includes:

[0097] Determine a power quality model with equipment access capacity as an independent variable corresponding to voltage deviation, third current harmonic, fifth current harmonic, voltage distortion rate and voltage three-phase imbalance respectively; refer to the above embodiment for description and no further details will be given.

[0098] The output active power of the distributed new energy equipment is derived from each power quality model to obtain power quality impact indicators corresponding to the voltage deviation, third current harmonic, fifth current harmonic, voltage distortion rate and voltage three-phase imbalance, respectively; the above embodiment can be referred to for explanation and will not be repeated here.

[0099] Selecting one of the power quality impact indicators to obtain the target power quality impact indicator can refer to the above embodiment for explanation and will not be repeated here.

[0100] Furthermore, determining the positional relationship between the device access node and each other node of the active distribution network relative to the transformer node of the distribution network station includes:

[0101] The positional relationship between the device access node and each other node of the active distribution network relative to the transformer node of the distribution network substation is determined based on the pre-established distribution network circuit model.

[0102] Furthermore, the determining of a target power quality impact indicator value set of the device access node on each other node of the active distribution network based on the positional relationship between the device access node and each other node of the active distribution network relative to the distribution network substation transformer node includes:

[0103] The relative positional relationship between each other node of the active distribution network and the device access node is traversed one by one. If it is determined that the current traversal node and the device access node are in the same branch of the active distribution network, and the first line distance between the device access node and the distribution network substation transformer node is greater than the second line distance between the current traversal node and the distribution network substation transformer node, the target power quality impact index value of the current traversal node is added to the target power quality impact index value set. This can be explained with reference to the above embodiment and will not be repeated here.

[0104] Furthermore, the responsibility quantification analysis method for evaluating the impact of device access on power quality also includes:

[0105] If it is determined that the current traversal node and the device access node are in the same branch of the active power distribution network, and the first line distance between the device access node and the distribution network substation transformer node is less than the second line distance between the current traversal node and the distribution network substation transformer node, then the target power quality impact index value of the device access node is added to the target power quality impact index value set. This can be explained with reference to the above embodiment and will not be repeated here.

[0106] Furthermore, the responsibility quantification analysis method for evaluating the impact of device access on power quality also includes:

[0107] If it is determined that the current traversal node and the device access node are in different branches of the active power distribution network, a confluence node of the two different branches is found, and the target power quality impact index value of the confluence node is added to the target power quality impact index value set. This can be explained with reference to the above embodiment and will not be repeated here.

[0108] Furthermore, the responsibility quantification analysis method for evaluating the impact of device access on power quality also includes:

[0109] The target power quality impact indicator value set is represented by constructing a power quality responsibility quantization matrix.

[0110] Figure 3 FIG. 1 is a schematic diagram of a device for quantitatively analyzing the impact of access of an evaluation device on power quality provided by an embodiment of the present invention. Figure 3 As shown, the device for quantitatively analyzing the impact of device access on power quality provided by the embodiment of the present invention includes a first determining unit 301, a second determining unit 302, and an evaluating unit 303, wherein:

[0111] The first determination unit 301 is used to determine the target device to be evaluated and the selected target power quality impact index; the second determination unit 302 is used to determine the target power quality impact index value set of the device access node for each other node of the active distribution network based on the position relationship between the device access node and each other node of the active distribution network relative to the distribution network substation transformer node; the evaluation unit 303 is used to use the ratio of the sum of all target power quality impact index values ​​to the total number of other nodes in the active distribution network as the power quality responsibility quantification result of evaluating the target device to be evaluated.

[0112] Specifically, the first determination unit 301 in the device is used to determine the target device to be evaluated and the selected target power quality impact index; the second determination unit 302 is used to determine the target power quality impact index value set of the device access node on each other node of the active distribution network based on the position relationship between the device access node and each other node of the active distribution network relative to the distribution network substation transformer node; the evaluation unit 303 is used to use the ratio of the sum of all target power quality impact index values ​​to the total number of other nodes in the active distribution network as the power quality responsibility quantification result of evaluating the target device to be evaluated.

[0113] The embodiment of the present invention provides a responsibility quantification analysis device for evaluating the impact of equipment access on power quality, which determines the target equipment to be evaluated and the selected target power quality impact index; determines the target power quality impact index value set of the equipment access node on each other node of the active distribution network based on the positional relationship between the equipment access node and each other node of the active distribution network relative to the transformer node of the distribution network substation; and uses the ratio of the sum of all target power quality impact index values ​​to the total number of other nodes of the active distribution network as the power quality responsibility quantification result of evaluating the target equipment to be evaluated. The device can quickly and relatively accurately analyze the responsibility of distributed new energy equipment at different locations in the distribution network for the impact on power quality and is easy to quantify. The device requires less data than the existing method, and the calculation difficulty is simpler than the existing method, which is conducive to engineering implementation.

[0114] The embodiment of the present invention provides an embodiment of a responsibility quantification analysis device for evaluating the impact of device access on power quality, which can be specifically used to execute the processing flow of the above-mentioned method embodiments. Its functions are not repeated here, and reference can be made to the detailed description of the above-mentioned method embodiments.

[0115] Figure 4 A schematic diagram of the physical structure of an electronic device provided in an embodiment of the present invention, such as Figure 4 As shown, the electronic device includes: a processor 401, a memory 402 and a bus 403;

[0116] The processor 401 and the memory 402 communicate with each other via a bus 403.

[0117] The processor 401 is configured to call the program instructions in the memory 402 to execute the methods provided by the above method embodiments, for example, including:

[0118] Determine the target equipment to be evaluated and the target power quality impact indicators to be selected;

[0119] Determine a target power quality impact indicator value set of the device access node on each other node of the active distribution network based on the positional relationship between the device access node and each other node of the active distribution network relative to the transformer node of the distribution network station area;

[0120] The ratio of the sum of all target power quality impact index values ​​to the total number of other nodes in the active distribution network is used as a quantitative result of evaluating the power quality responsibility of the target device to be evaluated.

[0121] This embodiment discloses a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer can perform the methods provided in the above-mentioned method embodiments, for example, including:

[0122] Determine the target equipment to be evaluated and the target power quality impact indicators to be selected;

[0123] Determine a target power quality impact indicator value set of the device access node on each other node of the active distribution network based on the positional relationship between the device access node and each other node of the active distribution network relative to the transformer node of the distribution network station area;

[0124] The ratio of the sum of all target power quality impact index values ​​to the total number of other nodes in the active distribution network is used as a quantitative result of evaluating the power quality responsibility of the target device to be evaluated.

[0125] This embodiment provides a computer-readable storage medium storing a computer program. The computer program enables the computer to execute the methods provided in the above method embodiments, for example, including:

[0126] Determine the target equipment to be evaluated and the target power quality impact indicators to be selected;

[0127] Determine a target power quality impact indicator value set of the device access node on each other node of the active distribution network based on the positional relationship between the device access node and each other node of the active distribution network relative to the transformer node of the distribution network station area;

[0128] The ratio of the sum of all target power quality impact index values ​​to the total number of other nodes in the active distribution network is used as a quantitative result of evaluating the power quality responsibility of the target device to be evaluated.

[0129] It will be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0130] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0131] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0132] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0133] Throughout this specification, reference to terms such as "one embodiment," "a specific embodiment," "some embodiments," "for example," "example," "specific example," or "some examples" 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 invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0134] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A responsibility quantification analysis method for evaluating the impact of equipment access on power quality, characterized in that: include: Determine the target equipment to be evaluated and the target power quality impact indicators to be selected; Determine a target power quality impact indicator value set of the device access node on each other node of the active distribution network based on the positional relationship between the device access node and each other node of the active distribution network relative to the transformer node of the distribution network station area; The ratio of the sum of all target power quality impact index values ​​to the total number of other nodes in the active distribution network is used as a quantitative result of evaluating the power quality responsibility of the target device to be evaluated; Determining the target power quality impact index includes: Determine the power quality model with the equipment access capacity as the independent variable corresponding to the voltage deviation, third current harmonic, fifth current harmonic, voltage distortion rate and voltage three-phase unbalance respectively; For each power quality model, the output active power of the distributed new energy equipment is derived to obtain the power quality impact indicators corresponding to the voltage deviation, third current harmonic, fifth current harmonic, voltage distortion rate and voltage three-phase imbalance. Select one of the power quality impact indicators to obtain the target power quality impact indicator; Determine the positional relationship between the equipment access node and each other node of the active distribution network relative to the transformer node of the distribution network station, including: Determine the positional relationship between the equipment access node and other nodes of each active distribution network relative to the transformer node in the distribution network substation based on the pre-established distribution network circuit model; The determining of a target power quality impact indicator value set of the device access node on each other node of the active distribution network based on a positional relationship between the device access node and each other node of the active distribution network relative to a transformer node in a distribution network station area includes: The relative position relationship between each other node of the active distribution network and the device access node is traversed one by one. If it is determined that the current traversal node and the device access node are in the same branch of the active distribution network, and the first line distance between the device access node and the distribution network substation transformer node is greater than the second line distance between the current traversal node and the distribution network substation transformer node, the target power quality impact index value of the current traversal node is added to the target power quality impact index value set.

2. The method for quantitatively analyzing the impact of device access on power quality according to claim 1, characterized in that: The method for quantitatively analyzing the impact of device access on power quality further includes: If it is determined that the current traversal node and the device access node are in the same branch of the active distribution network, and the first line distance between the device access node and the distribution network substation transformer node is less than the second line distance between the current traversal node and the distribution network substation transformer node, then the target power quality impact index value of the device access node is added to the target power quality impact index value set.

3. The method for quantitatively analyzing the impact of device access on power quality according to claim 2, characterized in that: The method for quantitatively analyzing the impact of device access on power quality further includes: If it is determined that the current traversal node and the device access node are in different branches of the active power distribution network, the confluence node of the two different branches is found, and the target power quality impact index value of the confluence node is added to the target power quality impact index value set.

4. The method for quantitatively analyzing the impact of device access on power quality according to any one of claims 1 to 3, characterized in that: The method for quantitatively analyzing the impact of device access on power quality further includes: The target power quality impact indicator value set is represented by constructing a power quality responsibility quantization matrix.

5. A responsibility quantification analysis device for evaluating the impact of equipment access on power quality, characterized in that: include: A first determining unit is used to determine the target equipment to be evaluated and the selected target power quality impact index; A second determining unit is configured to determine a target power quality impact indicator value set of the device access node on each other node of the active distribution network based on a positional relationship between the device access node and each other node of the active distribution network relative to the transformer node of the distribution network station area; An evaluation unit, configured to use the ratio of the sum of all target power quality impact index values ​​to the total number of other nodes in the active distribution network as a quantitative result of evaluating the power quality responsibility of the target device to be evaluated; The first determining unit is specifically configured to: Determine the power quality model with the equipment access capacity as the independent variable corresponding to the voltage deviation, third current harmonic, fifth current harmonic, voltage distortion rate and voltage three-phase unbalance respectively; For each power quality model, the output active power of the distributed new energy equipment is derived to obtain the power quality impact indicators corresponding to the voltage deviation, third current harmonic, fifth current harmonic, voltage distortion rate and voltage three-phase imbalance. Select one from each power quality impact index to obtain the target power quality impact index; The second determining unit is specifically configured to: Determine the positional relationship between the equipment access node and other nodes of each active distribution network relative to the transformer node in the distribution network substation based on the pre-established distribution network circuit model; The second determining unit is specifically configured to: The relative position relationship between each other node of the active distribution network and the device access node is traversed one by one. If it is determined that the current traversal node and the device access node are in the same branch of the active distribution network, and the first line distance between the device access node and the distribution network substation transformer node is greater than the second line distance between the current traversal node and the distribution network substation transformer node, the target power quality impact index value of the current traversal node is added to the target power quality impact index value set.

6. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 4 are implemented.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 4 are implemented.

Images