Quantitative responsibility analysis method and device for evaluating influence of equipment access on electric energy quality

Abstract

The invention provides a responsibility quantitative analysis method and device for evaluating the influence of equipment access on electric energy quality, and relates to the technical field of new energy. The method comprises the following steps: determining a to-be-evaluated target device and a selected target power quality influence index; determining a target electric energy quality influence index value set of the equipment access node on other nodes of each active power distribution network according to the position relationship between the equipment access node and the other nodes of each active power distribution network relative to the power distribution network area transformer node; and taking the ratio of the sum of all target electric energy quality influence index values to the total number of other nodes of the active power distribution network as an electric energy quality responsibility quantification result for evaluating the to-be-evaluated target equipment. The device executes the method. According to the method and the device provided by the embodiment of the invention, the responsibility of the influence on the electric energy quality after the distributed new energy equipment at different positions in the power distribution network is accessed can be quickly and accurately analyzed and is easy to 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 equipment 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 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 intermittent and power flow reverse characteristics, which has led to 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, the responsibility quantitative analysis of evaluating the impact of equipment access location and capacity on power quality has strong practical significance. However, the traditional power quality responsibility quantitative analysis mostly focuses on harmonic sources, and does not pay attention to the most critical voltage over-limit problem in actual situations. In addition, the algorithm is complex to implement and has a strong dependence on distribution network data, which is not conducive to its widespread application in active distribution networks. Summary of the invention

[0003] In view of the problems in the prior art, an embodiment of the present invention provides 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] On the one hand, 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 index value set of the device access node on each other node of the active distribution network according to 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 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] Wherein, determining the target power quality impact index includes:

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

[0010] The output active power of distributed new energy equipment is derived for each power quality model to obtain power quality impact indicators corresponding to 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 according to the pre-established distribution network circuit model.

[0014] Wherein, the determination of the target power quality impact index value set of the device access node on each other node of the active distribution network according to 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 station area 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, 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 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] On the one hand, the present invention provides a responsibility quantification analysis device for evaluating the impact of device access on power quality, comprising:

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

[0024] A second determination unit is used to determine a target power quality impact index value set of the device access node on each other node of the active distribution network according to 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 station area;

[0025] The evaluation unit 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 a quantitative result of evaluating the power quality responsibility of the target device to be evaluated.

[0026] In another aspect, an embodiment of the present invention provides an electronic device, including: 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 index value set of the device access node on each other node of the active distribution network according to 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 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 index value set of the device access node on each other node of the active distribution network according to 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 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 according to 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; takes 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, which can quickly and more accurately analyze the impact of distributed new energy equipment at different positions in the distribution network on power quality and is easy to quantify, has less data requirements than existing methods, is simpler in calculation difficulty than existing methods, and 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 use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0039] Figure 1 It is a flow chart of a responsibility quantification analysis method for evaluating the impact of device access on power quality provided by an embodiment of the present invention.

[0040] Figure 2 It is a schematic diagram illustrating a distribution network circuit model provided in 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 evaluation device on power quality provided by an 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] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below in conjunction with 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, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other arbitrarily.

[0044] Terminology Note:

[0045] Active distribution network: An active distribution network is a distribution network that performs comprehensive control over 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 new energy equipment on the power quality of the distribution network after it is connected and quantitatively evaluating its impact.

[0047] Figure 1 FIG. 1 is a flow chart of a method for quantifying the impact of device access on power quality provided by an embodiment of the present invention. Figure 1 As shown, the responsibility quantification analysis method for evaluating the impact of device access on power quality provided by the embodiment of the present invention includes:

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

[0049] Step S2: Determine a target power quality impact index value set of the device access node on each other node of the active distribution network according to 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 station area.

[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 quantitative result of evaluating the power quality responsibility of the target device to be evaluated.

[0051] In the above step S1, the device determines the target device to be evaluated and the selected target power quality impact index. The device may be a computer device that executes the method, for example, may include a server. It should be noted that the acquisition and analysis of data involved in the embodiment of the present invention is authorized by the user.

[0052] In the above step S2, the device determines a target power quality impact indicator value set of the device access node on each other node of the active distribution network according to 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 station area.

[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] Determine the target power quality impact index, including:

[0055] Determine the power quality model with the equipment access capacity as the independent variable corresponding to the voltage deviation, the third current harmonic, the fifth current harmonic, the voltage distortion rate and the voltage three-phase unbalance; such as Figure 2 As shown in the figure, the transformer node in the distribution network area is considered to be an ideal voltage source, and its voltage is expressed as U N , represents the standard value of the distribution network voltage. 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 out power as , and after sending out power 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 of 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, whose different values ​​represent different control strategies of 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 third and fifth harmonic current amplitudes 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 the actual distribution network, it is considered that the imbalance is caused by the access of single-phase power to the grid. Here, it is assumed that phase A is connected to the converter to transmit power to the grid, thereby causing a single-phase voltage deviation, and the other two phases remain unchanged. Finally, the output power-three-phase imbalance model is established:

[0075]

[0076] Among them, U a_before U is the voltage on one phase of the grid-connected device output power 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 one phase of the grid-connected device output power.

[0077] The output active power of distributed new energy equipment is derived for each power quality model, and the power quality impact indicators corresponding to voltage deviation, third current harmonic, fifth current harmonic, voltage distortion rate and voltage three-phase imbalance are obtained; considering that most of the power quality problems of low-voltage distribution network are caused by the output active power of equipment, the output active power of distributed new energy equipment is derived for each power quality model, and the expression is 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 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 is determined according to the pre-established distribution network circuit model. Figure 2 Not shown in FIG.

[0085] The determining of a target power quality impact index value set of the device access node on each other node of the active distribution network according to 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 station area includes:

[0086] 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, then 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 position is after the evaluation node position 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 evaluation node.

[0087] The responsibility quantification analysis method for evaluating the impact of device access on power quality also includes:

[0088] 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. That is, for nodes in the same branch of the distribution network, if the device access node position is before the evaluation node position 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 responsibility quantification analysis method for evaluating the impact of device access on power quality also 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 quantization matrix A can be constructed according to the label of each node, and the matrix element a in the matrix ij It is the value of a power quality impact indicator of node i caused by the output power of the device connected to node j.

[0091]

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

[0093]

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

[0095] The embodiment of the present invention provides a method for quantitatively analyzing the responsibility of evaluating the impact of device access on power quality, 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 according to 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; takes 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, which can quickly and more accurately analyze the responsibility of distributed new energy devices at different positions in the distribution network for the impact on power quality and is easy to quantify, has less data requirements than the existing methods, is simpler in calculation difficulty than the existing methods, and 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 are given.

[0098] The output active power of the distributed new energy equipment is derived for 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-mentioned embodiments can be referred to for description and will not be repeated here.

[0099] Select one of the power quality impact indicators to obtain the target power quality impact indicator. The above embodiments can be referred to for explanation and will not be described in detail.

[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 area 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 station area is determined according to the pre-established distribution network circuit model.

[0102] Further, the target power quality impact index value set of the device access node on each other node of the active distribution network is determined 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 station area, including:

[0103] 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. Please refer to the above embodiment for description and do not repeat it again.

[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 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. The above embodiment can be referred to for explanation 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, 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 above embodiment can be referred to for explanation 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 index value set is represented by constructing a power quality responsibility quantization matrix. The above-mentioned embodiment can be referred to for explanation and will not be described in detail.

[0110] Figure 3 is a schematic diagram of a structure 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, such as 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 determination unit 301, a second determination unit 302 and an evaluation 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 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.

[0113] The embodiment of the present invention provides a 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 according to 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; takes 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, which can quickly and more accurately analyze the impact of distributed new energy equipment at different positions in the distribution network on power quality and is easy to quantify, has less data requirements than the existing methods, is simpler in calculation difficulty than the existing methods, and 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 (processor) 401, a memory (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 used 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 index value set of the device access node on each other node of the active distribution network according to 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 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 by the above 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 index value set of the device access node on each other node of the active distribution network according to 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 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, wherein the computer-readable storage medium stores a computer program, wherein the computer program enables the computer to execute the methods provided by 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 index value set of the device access node on each other node of the active distribution network according to 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 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] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, 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 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 flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, 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 flowchart and / or block diagram. 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 capable of directing a computer or other programmable data processing device to operate 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 A 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 operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions 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] In the description of this specification, the description with reference to the terms "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, the schematic representation of the above terms does 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.

[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 index value set of the device access node on each other node of the active distribution network according to 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 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.

2. The method for quantitatively analyzing the impact of device access on power quality according to claim 1 is characterized in that: Determine the target power quality impact index, including: Determine the power quality model with the equipment access capacity as the independent variable corresponding to the voltage deviation, the third current harmonic, the fifth current harmonic, the voltage distortion rate and the voltage three-phase unbalance respectively; The output active power of distributed new energy equipment is derived for each power quality model to obtain power quality impact indicators corresponding to voltage deviation, third current harmonic, fifth current harmonic, voltage distortion rate and voltage three-phase imbalance. One of the power quality impact indicators is selected to obtain the target power quality impact indicator.

3. The method for quantifying the impact of device access on power quality according to claim 1 is characterized in that: 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 area, including: 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 according to the pre-established distribution network circuit model.

4. The method for quantitatively analyzing the impact of device access on power quality according to claim 1 is characterized in that: The determining of a target power quality impact index value set of the device access node on each other node of the active distribution network according to 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 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.

5. The method for quantitatively analyzing the impact of device access on power quality according to claim 4 is characterized in that: The responsibility quantification analysis method for evaluating the impact of device access on power quality also 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, the target power quality impact index value of the device access node is added to the target power quality impact index value set.

6. The method for quantifying the impact of device access on power quality according to claim 5 is characterized in that: The responsibility quantification analysis method for evaluating the impact of device access on power quality also includes: If it is determined that the current traversal node and the device access node are in different branches of the active 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.

7. The method for quantitatively analyzing the impact of device access on power quality according to any one of claims 1 to 6, characterized in that: The responsibility quantification analysis method for evaluating the impact of device access on power quality also includes: The target power quality impact indicator value set is represented by constructing a power quality responsibility quantization matrix.

8. A responsibility quantification analysis device for evaluating the impact of equipment access on power quality, characterized in that: include: A first determination unit is used to determine the target equipment to be evaluated and the selected target power quality impact index; A second determination unit is used to determine a target power quality impact index value set of the device access node on each other node of the active distribution network according to 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 station area; The evaluation unit 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 a quantitative result of evaluating the power quality responsibility of the target device to be evaluated.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. 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 7 are implemented.

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