A Distributed New Energy Substation Area Voltage Control Method and System

Abstract

The present invention relates to the technical field of voltage control, and specifically discloses a distributed new energy substation area voltage control method and system, including: obtaining the phase angles of all access nodes at all sampling moments based on all real-time data of all access nodes; obtaining the power loss values of all access nodes at all sampling moments based on the phase angles of all access nodes at all sampling moments, and obtaining the voltage offset values of all access nodes at all sampling moments based on all real-time data of all access nodes at all sampling moments; obtaining the node analysis matrix of all access nodes and the voltage control result of the new energy substation area based on the power loss values of all access nodes at all sampling moments and the voltage offset values of all access nodes at all sampling moments. The present invention reduces the losses generated when all access nodes in the new energy substation area are connected, and efficiently improves the stability of the power grid in the new energy substation area.

Description

Technical Field

[0001] The present invention relates to the technical field of voltage control, and particularly relates to a voltage control method and system for a distributed new energy substation area. Background Art

[0002] Currently, a distributed substation area generally refers to a power system structure where power generation equipment is deployed in a dispersed manner at different locations in the power system, directly supplying power to users or being incorporated into the power grid. This distributed structure helps to enhance the flexibility and reliability of the power grid, optimize energy allocation, and promote the access and utilization of renewable energy.

[0003] However, due to the randomness and dispersion of distributed energy access points, traditional voltage control methods not only fail to meet the requirements of distributed energy access but may also lead to the instability of the new energy substation area power grid. Therefore, it is necessary to specifically control the voltage of the distributed new energy substation area to address the challenges brought by new energy access. Existing voltage control methods and systems for distributed new energy substation areas only evaluate the reactive power sufficiency of the substation area and the diverse voltage regulation requirements of each line in the substation area, so as to be able to control the over-limit voltage within ±8V according to the evaluation results corresponding to the voltage regulation process. However, they cannot accurately analyze the power loss and voltage deviation generated when each grid-connected node accesses the new energy substation area power grid, nor can they comprehensively analyze all grid-connected nodes in the new energy substation area, let alone reduce the losses generated when all grid-connected nodes in the new energy substation area access and improve the stability of the new energy substation area power grid. For example, the patent with the publication number "CN111832071A" and the patent name "An information security system and an information security method" has the following steps: collecting the voltage at the user end; evaluating the reactive power capacity of the current substation area, and performing inverter reactive power control when the reactive power capacity is sufficient; evaluating all line deviation values in the substation area when the reactive power capacity is insufficient; when the deviation is small, the inverter and the transformer cooperate for control, and when the deviation is large, the inverter reactive power control; judging the over-limit situation and performing voltage control. However, this patent only evaluates the reactive power sufficiency of the substation area and the diverse voltage regulation requirements of each line in the substation area, so as to be able to control the over-limit voltage within ±8V according to the evaluation results corresponding to the voltage regulation process. However, it cannot accurately analyze the power loss and voltage deviation generated when each grid-connected node accesses the new energy substation area power grid, nor can it comprehensively analyze all grid-connected nodes in the new energy substation area, let alone reduce the losses generated when all grid-connected nodes in the new energy substation area access and improve the stability of the new energy substation area power grid.

[0004] Therefore, the present invention proposes a voltage control method and system for a distributed new energy substation area. Summary of the Invention

[0005] The present invention provides a distributed new - energy sub - station area voltage control method and system, which can accurately obtain the power loss values of all network - connected nodes at all sampling moments according to the phase angles of all network - connected nodes at all sampling moments, accurately obtain the voltage offset values of all network - connected nodes at all sampling moments according to all real - time data of all network - connected nodes at all sampling moments and the total number of all network - connected nodes in the new - energy sub - station area, and comprehensively analyze the power loss and voltage offset generated when each network - connected node accesses the new - energy sub - station area power grid according to the node analysis matrix of all network - connected nodes built based on the power loss values of all network - connected nodes at all sampling moments and the voltage offset values of all network - connected nodes at all sampling moments, facilitating the subsequent accurate acquisition of the new - energy sub - station area voltage control result. Furthermore, the new - energy sub - station area voltage control result is obtained according to all node analysis matrices, minimizing the loss generated when all network - connected nodes in the new - energy sub - station area are connected, and efficiently improving the stability of the new - energy sub - station area power grid.

[0006] The present invention provides a distributed new - energy sub - station area voltage control method, including:

[0007] S1: Obtain all real - time data of all network - connected nodes in the new - energy sub - station area within a preset time, and obtain the phase angles of all network - connected nodes at all sampling moments based on all real - time data of all network - connected nodes;

[0008] S2: Based on the phase angles of all network - connected nodes at all sampling moments, obtain the power loss values of all network - connected nodes at all sampling moments. Based on all real - time data of all network - connected nodes at all sampling moments and the total number of all network - connected nodes in the new - energy sub - station area, obtain the voltage offset values of all network - connected nodes at all sampling moments;

[0009] S3: Obtain the node analysis matrix of all network - connected nodes based on the power loss values of all network - connected nodes at all sampling moments and the voltage offset values of all network - connected nodes at all sampling moments, and obtain the new - energy sub - station area voltage control result based on all node analysis matrices.

[0010] Preferably, for the distributed new - energy sub - station area voltage control method, S1: Obtain all real - time data of all network - connected nodes in the new - energy sub - station area within a preset time, and obtain the phase angles of all network - connected nodes at all sampling moments based on all real - time data of all network - connected nodes, including:

[0011] Obtain all real - time data of all network - connected nodes in the new - energy sub - station area within a preset time before the current moment, where all real - time data includes node voltage, node current, and node rated voltage;

[0012] Based on a preset number of samplings, evenly sample the preset time period before the current moment to obtain all sampling moments;

[0013] Obtain the phase angles of all networked nodes at all sampling moments based on all real-time data of all networked nodes.

[0014] Preferably, for the distributed new energy substation area voltage control method, obtaining the phase angles of all networked nodes at all sampling moments based on all real-time data of all networked nodes includes:

[0015] Based on the node voltages and node currents of all networked nodes in the new energy substation area within a preset time before the current moment, obtain the initial voltage waveform diagram and the initial current waveform diagram of all networked nodes in the new energy substation area;

[0016] Perform waveform continuity judgment on the initial voltage waveform diagram or the initial current waveform diagram of all networked nodes in the new energy substation area to obtain a continuity judgment result;

[0017] When the continuity judgment results of the initial voltage waveform diagram and the initial current waveform diagram are that both the initial voltage waveform diagram and the initial current waveform diagram are continuous, then regard the initial voltage waveform diagram and the initial current waveform diagram as the final voltage waveform diagram and the final current waveform diagram respectively;

[0018] When the continuity judgment result of the initial voltage waveform diagram or the initial current waveform diagram is that there is a discontinuous waveform diagram in the initial voltage waveform diagram and the initial current waveform diagram, obtain all the break points in the initial voltage waveform diagram or the initial current waveform diagram, and obtain the waveform values at the moments of 1 waveform cycle, 2 waveform cycles, 3 waveform cycles, and 4 waveform cycles from the corresponding break points before each break point as reference waveform values;

[0019] And judge whether there are the same waveform values among the 4 waveform reference values. If so, regard the waveform value that appears the most times among the 4 waveform reference values as the filling waveform value of the corresponding break point. Otherwise, regard the average value of the 4 waveform reference values as the filling waveform value of the corresponding break point;

[0020] Based on the filling waveform values of all break points, the initial voltage waveform diagram, and the initial current waveform diagram, obtain the final voltage waveform diagram and the final current waveform diagram;

[0021] Based on the final voltage waveform diagram and the final current waveform diagram, obtain the phase angles of each networked node at each sampling moment.

[0022] Preferably, for the distributed new energy substation area voltage control method, S2: Based on the phase angles of all networked nodes at all sampling moments, obtain the power loss values of all networked nodes at all sampling moments. Based on all real-time data of all networked nodes at all sampling moments and the total number of all networked nodes in the new energy substation area, obtain the voltage offset values of all networked nodes at all sampling moments, including:

[0023] S201: Obtain the power loss values of all grid-connected nodes at all sampling moments based on the phase angles, node voltages, and node currents of all grid-connected nodes at all sampling moments;

[0024] S202: Determine the node voltages and rated node voltages of all grid-connected nodes at all sampling moments based on all real-time data of all grid-connected nodes at all sampling moments;

[0025] S203: Obtain the voltage offset values of all grid-connected nodes at all sampling moments based on the node voltages and rated node voltages of all grid-connected nodes at all sampling moments and the total number of all grid-connected nodes in the new energy distribution area.

[0026] Preferably, for the voltage control method of the distributed new energy distribution area, S201: Obtain the power loss values of all grid-connected nodes at all sampling moments based on the phase angles, node voltages, and node currents of all grid-connected nodes at all sampling moments, including:

[0027]

[0028] where, P i is the power loss value of a single grid-connected node at the i-th sampling moment, with the unit of W, U i is the node voltage of the corresponding grid-connected node at the i-th sampling moment, I i is the node current of the corresponding grid-connected node at the i-th sampling moment, U 0 is the rated grid voltage of the distribution area power grid, θ i is the phase angle of the corresponding grid-connected node at the i-th sampling moment, cosθ i is the cosine value of the phase angle of the corresponding grid-connected node at the i-th sampling moment, and n is the number of all sampling moments within the preset time period before the current moment.

[0029] Preferably, for the voltage control method of the distributed new energy distribution area, S203: Obtain the voltage offset values of all grid-connected nodes at all sampling moments based on the node voltages and rated node voltages of all grid-connected nodes at all sampling moments and the total number of all grid-connected nodes in the new energy distribution area, including:

[0030]

[0031] where, K i is the voltage offset value of a single grid-connected node at the i-th sampling moment, with the unit of V, U i is the node voltage of the corresponding grid-connected node at the i-th sampling moment, U 0 is the rated grid voltage of the distribution area power grid, U τ is the rated node voltage of the corresponding grid-connected node, and n is the number of all sampling moments of a single grid-connected node.

[0032] Preferably, for the distributed new energy substation area voltage control method, S3: Obtain the node analysis matrix of all grid-connected nodes based on the power loss values of all grid-connected nodes at all sampling moments and the voltage offset values of all grid-connected nodes at all sampling moments, and obtain the new energy substation area voltage control result based on all node analysis matrices, including:

[0033] S301: Obtain the node analysis matrix of all grid-connected nodes based on the power loss values of all grid-connected nodes at all sampling moments and the voltage offset values of all grid-connected nodes at all sampling moments;

[0034] S302: Obtain the substation area voltage control range based on all node analysis matrices, and obtain the new energy substation area voltage control result based on the substation area voltage control range.

[0035] Preferably, for the distributed new energy substation area voltage control method, S301: Obtain the node analysis matrix of all grid-connected nodes based on the power loss values of all grid-connected nodes at all sampling moments and the voltage offset values of all grid-connected nodes at all sampling moments, including:

[0036]

[0037] Wherein, S is the node analysis matrix of a single node, P 1 is the power loss value of the corresponding grid-connected node at the 1st sampling moment, P 2 is the power loss value of a single grid-connected node at the 2nd sampling moment, P n is the power loss value of a single grid-connected node at the nth sampling moment, K 1 is the voltage offset value of a single grid-connected node at the 1st sampling moment, K 2 is the voltage offset value of a single grid-connected node at the 2nd sampling moment, K n is the voltage offset value of a single grid-connected node at the nth sampling moment.

[0038] Preferably, for the distributed new energy substation area voltage control method, S302: Obtain the substation area voltage control range based on all node analysis matrices, and obtain the new energy substation area voltage control result based on the substation area voltage control range, including:

[0039] Select the node analysis matrix with the largest rank from all node analysis matrices as the reference matrix, and use the grid-connected node corresponding to the reference matrix as the reference node;

[0040] Take the product of the absolute value of the difference between the rated voltage of the reference node and the node voltage of the reference node at the current moment and the rank of the reference matrix as the range determination value;

[0041] Take the rated voltage of the power grid in the new energy substation area as the middle value of the voltage control range, and take the range determination value as the voltage difference from the middle value to the boundary value of the substation area voltage control range to obtain the substation area voltage control range;

[0042] Control the power grid voltage of the new energy substation area within the substation area voltage control range as the new energy substation area voltage control result.

[0043] The present invention provides a distributed new energy substation area voltage control system for implementing any one of the distributed new energy substation area voltage control methods in Embodiments 1 to 9, including:

[0044] An acquisition module for acquiring all real-time data of all access nodes in the new energy substation area within a preset time and obtaining the phase angles of all access nodes at all sampling moments based on all the real-time data of all access nodes;

[0045] A calculation module for obtaining the power loss values of all access nodes at all sampling moments based on the phase angles of all access nodes at all sampling moments, and obtaining the voltage offset values of all access nodes at all sampling moments based on all the real-time data of all access nodes at all sampling moments and the total number of all access nodes in the new energy substation area;

[0046] A control module for obtaining the node analysis matrix of all access nodes based on the power loss values of all access nodes at all sampling moments and the voltage offset values of all access nodes at all sampling moments, and obtaining the new energy substation area voltage control result based on all the node analysis matrices.

[0047] The beneficial effects of the present invention compared with the prior art are as follows: accurately obtain the power loss values of all access nodes at all sampling moments according to the phase angles of all access nodes at all sampling moments, accurately obtain the voltage offset values of all access nodes at all sampling moments according to all the real-time data of all access nodes at all sampling moments and the total number of all access nodes in the new energy substation area, and comprehensively analyze the power loss and voltage offset generated when each access node accesses the new energy substation area power grid according to the node analysis matrix of all access nodes built based on the power loss values of all access nodes at all sampling moments and the voltage offset values of all access nodes at all sampling moments, which is convenient for accurately obtaining the new energy substation area voltage control result subsequently, and then obtaining the new energy substation area voltage control result according to all the node analysis matrices, minimizing the loss generated when all access nodes in the new energy substation area are accessed, and efficiently improving the stability of the new energy substation area power grid.

[0048] Other features and advantages of the present invention will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained by the structure specifically pointed out in the written application documents of the present application.

[0049] The technical solution of the present invention will be further described in detail below through the accompanying drawings and embodiments. Description of the Drawings

[0050] The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, and do not constitute a limitation to the present invention. In the accompanying drawings:

[0051] Figure 1 It is a flowchart of a distributed new energy substation area voltage control method in an embodiment of the present invention;

[0052] Figure 2 It is a schematic diagram of a distributed new energy substation area voltage control system in an embodiment of the present invention. Detailed Embodiments

[0053] The following describes the preferred embodiments of the present invention with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0054] Embodiment 1:

[0055] The present invention provides a distributed new energy substation area voltage control method, referring to Figure 1 , including:

[0056] S1: Obtain all real-time data of all access nodes in the new energy substation area within a preset time, and obtain the phase angles of all access nodes at all sampling moments based on all the real-time data of all access nodes;

[0057] S2: Based on the phase angles of all access nodes at all sampling moments, obtain the power loss values of all access nodes at all sampling moments. Based on all the real-time data of all access nodes at all sampling moments and the total number of all access nodes in the new energy substation area, obtain the voltage offset values of all access nodes at all sampling moments;

[0058] S3: Obtain the node analysis matrix of all access nodes based on the power loss values of all access nodes at all sampling moments and the voltage offset values of all access nodes at all sampling moments, and obtain the voltage control result of the new energy substation area based on all the node analysis matrices.

[0059] In this embodiment, the new energy substation area is the power supply range or area of a transformer in the power system, and distributed new energy power generation equipment, such as solar photovoltaic panels, wind turbines, etc., is deployed in the substation area.

[0060] In this embodiment, the grid connection node is the access point of a single new energy power generation equipment in the new energy substation area to the main grid of the substation area.

[0061] In this embodiment, the preset time is a pre-set time period for obtaining the real-time data of all grid connection nodes, such as 10 minutes.

[0062] In this embodiment, the sampling moment is the specific time point selected during the process of uniformly sampling the preset time period before the current moment.

[0063] In this embodiment, the phase angle is the phase difference between the final voltage waveform diagram and the final current waveform diagram of the corresponding grid connection node at each sampling moment obtained based on all the real-time data of each grid connection node.

[0064] In this embodiment, the power loss value is the power loss caused by the mismatch between the parameters such as voltage and frequency of the grid when each grid connection node accesses the new energy substation area grid at each sampling moment.

[0065] In this embodiment, the total number of grid connection nodes is the total number of all new energy power generation equipment in the new energy substation area.

[0066] In this embodiment, the voltage offset value is the voltage value by which the voltage of the corresponding grid connection node rises or falls relative to the rated voltage of the node due to the fact that the access may change the power flow of the new energy substation area grid when each grid connection node accesses the new energy substation area grid at each sampling moment.

[0067] In this embodiment, the node analysis matrix is a matrix obtained based on the power loss values of each grid connection node at all sampling moments and the voltage offset values of the corresponding grid connection nodes at all sampling moments, and is used to analyze the power loss and voltage offset when the corresponding grid connection nodes access the new energy substation area grid.

[0068] In this embodiment, the new energy substation area voltage control result is the control result of controlling the grid voltage of the new energy substation area within the substation area voltage control range.

[0069] The beneficial effects of the above technology are as follows: accurately obtain the power loss values of all networked nodes at all sampling moments based on the phase angles of all networked nodes at all sampling moments, accurately obtain the voltage offset values of all networked nodes at all sampling moments based on all real-time data of all networked nodes at all sampling moments and the total number of all networked nodes in the new energy distribution area, and comprehensively analyze the power loss and voltage offset generated when each networked node accesses the new energy distribution area power grid according to the node analysis matrix of all networked nodes built based on the power loss values of all networked nodes at all sampling moments and the voltage offset values of all networked nodes at all sampling moments, which is convenient for accurately obtaining the voltage control result of the new energy distribution area subsequently. Furthermore, obtain the voltage control result of the new energy distribution area according to all node analysis matrices, minimizing the loss generated when all networked nodes in the new energy distribution area are connected, and efficiently improving the stability of the new energy distribution area power grid.

[0070] Embodiment 2:

[0071] Based on Embodiment 1, for the voltage control method of the distributed new energy distribution area, S1: Obtain all real-time data of all networked nodes in the new energy distribution area within a preset time, and obtain the phase angles of all networked nodes at all sampling moments based on all real-time data of all networked nodes, including:

[0072] Obtain all real-time data of all networked nodes in the new energy distribution area within a preset time before the current moment, where all real-time data includes node voltage, node current, and node rated voltage;

[0073] Based on a preset number of samplings, evenly sample the preset time period before the current moment to obtain all sampling moments;

[0074] Obtain the phase angles of all networked nodes at all sampling moments based on all real-time data of all networked nodes.

[0075] In this embodiment, the node voltage is the voltage output in real time by each networked node (new energy power generation equipment) in the new energy distribution area.

[0076] In this embodiment, the node current is the current output in real time by each networked node (new energy power generation equipment) in the new energy distribution area.

[0077] In this embodiment, the node rated voltage is the voltage magnitude corresponding to the electric energy output after energy conversion when each networked node (new energy power generation equipment) in the new energy distribution area is in a normal operating state.

[0078] In this embodiment, the preset number of samplings is a preset number used to evenly sample the preset time period before the current moment, where the time intervals between each group of adjacent sampling moments obtained by the uniform sampling are the same.

[0079] The beneficial effects of the above technology are as follows: Based on all the real-time data of all the access nodes in the new energy substation area, the phase angles of all the access nodes at all sampling moments are accurately obtained, which is convenient for the subsequent calculation of the power loss value.

[0080] Embodiment 3:

[0081] Based on the method for controlling the voltage of the distributed new energy substation area in Embodiment 2, the phase angles of all the access nodes at all sampling moments are obtained based on all the real-time data of all the access nodes, including:

[0082] Based on the node voltages and node currents of all the access nodes in the new energy substation area within a preset time before the current moment, the initial voltage waveform diagram and the initial current waveform diagram of all the access nodes in the new energy substation area are obtained;

[0083] Perform waveform continuity judgment on the initial voltage waveform diagram or the initial current waveform diagram of all the access nodes in the new energy substation area to obtain a continuity judgment result;

[0084] When the continuity judgment results of the initial voltage waveform diagram and the initial current waveform diagram are that both the initial voltage waveform diagram and the initial current waveform diagram are continuous, then the initial voltage waveform diagram and the initial current waveform diagram are respectively regarded as the final voltage waveform diagram and the final current waveform diagram;

[0085] When the continuity judgment result of the initial voltage waveform diagram or the initial current waveform diagram is that there is a discontinuous waveform diagram in the initial voltage waveform diagram and the initial current waveform diagram, obtain all the break points in the initial voltage waveform diagram or the initial current waveform diagram, and obtain the waveform values at the moments that are 1 waveform period, 2 waveform periods, 3 waveform periods, and 4 waveform periods away from the corresponding break points before each break point as reference waveform values (that is, the time intervals between the corresponding moments of the reference waveform values and the moments of the corresponding break points are 1 waveform period, 2 waveform periods, 3 waveform periods, and 4 waveform periods respectively);

[0086] And determine whether there are the same waveform values among the 4 waveform reference values. If so, regard the waveform value that appears the most times among the 4 waveform reference values as the filling waveform value of the corresponding break point. Otherwise, regard the average value of the 4 waveform reference values as the filling waveform value of the corresponding break point;

[0087] Obtain the final voltage waveform diagram and the final current waveform diagram based on the filling waveform values of all the break points, the initial voltage waveform diagram, and the initial current waveform diagram;

[0088] Obtain the phase angle of each access node at each sampling moment based on the final voltage waveform diagram and the final current waveform diagram.

[0089] In this embodiment, the initial voltage waveform diagram is obtained based on the node voltages of all the network access nodes in the new energy distribution area within a preset time before the current moment, so as to obtain the voltage waveforms of all the network access nodes in the new energy distribution area within the preset time.

[0090] In this embodiment, the initial current waveform diagram is obtained based on the node currents of all the network access nodes in the new energy distribution area within a preset time before the current moment, so as to obtain the current waveforms of all the network access nodes in the new energy distribution area within the preset time.

[0091] In this embodiment, the waveform continuity judgment is to judge whether there are interruptions or jumps in the waveform signals of the initial voltage waveform diagram or the initial current waveform diagram of each network access node in the new energy distribution area in the time domain.

[0092] In this embodiment, the continuity judgment result is the result obtained by performing waveform continuity judgment on the initial voltage waveform diagram or the initial current waveform diagram.

[0093] In this embodiment, the final voltage waveform diagram is the voltage waveform diagram obtained after waveform processing of the initial voltage waveform diagram.

[0094] In this embodiment, the final current waveform diagram is the current waveform diagram obtained after waveform processing of the initial current waveform diagram.

[0095] In this embodiment, the discontinuous point is the point where the waveform signal of the initial voltage waveform diagram or the initial current waveform diagram has an interruption in the time domain.

[0096] In this embodiment, the waveform period is the time elapsed from the starting point of a waveform (such as from 0 degrees or from the origin of the time axis) to the point where the same waveform amplitude is reached again (such as reaching 0 degrees again or passing through the origin of the time axis again).

[0097] In this embodiment, the reference waveform value is the waveform value to be referred to for filling each discontinuous point in the initial voltage waveform diagram or the initial current waveform diagram.

[0098] In this embodiment, obtaining the phase angle of each network access node at each sampling moment based on the final voltage waveform diagram and the final current waveform diagram is: using the phase difference between the final voltage waveform diagram and the final current waveform diagram of each network access node at each sampling moment as the phase angle corresponding to the sampling moment.

[0099] The beneficial effects of the above technology are as follows: The initial voltage waveform diagram or the initial current waveform diagram of all the network access nodes is obtained according to all the real-time data of all the network access nodes in the new energy distribution area. By performing periodic sampling and filling on the discontinuous points in the initial voltage waveform diagram or the initial current waveform diagram, the final voltage waveform diagram and the final current waveform diagram are obtained, avoiding the inability to obtain the phase angle due to data loss in the initial voltage waveform diagram or the initial current waveform diagram.

[0100] Example 4:

[0101] Based on Example 1, for the distributed new - energy sub - area voltage control method, S2: Based on the phase angles of all grid - connected nodes at all sampling moments, obtain the power loss values of all grid - connected nodes at all sampling moments. Based on all real - time data of all grid - connected nodes at all sampling moments and the total number of all grid - connected nodes in the new - energy sub - area, obtain the voltage deviation values of all grid - connected nodes at all sampling moments, including:

[0102] S201: Based on the phase angles, node voltages, and node currents of all grid - connected nodes at all sampling moments, obtain the power loss values of all grid - connected nodes at all sampling moments;

[0103] S202: Based on all real - time data of all grid - connected nodes at all sampling moments, determine the node voltages and rated node voltages of all grid - connected nodes at all sampling moments;

[0104] S203: Based on the node voltages and rated node voltages of all grid - connected nodes at all sampling moments and the total number of all grid - connected nodes in the new - energy sub - area, obtain the voltage deviation values of all grid - connected nodes at all sampling moments.

[0105] The beneficial effects of the above - mentioned technology are as follows: Accurately obtain the power loss values of all grid - connected nodes at all sampling moments according to the phase angles of all grid - connected nodes at all sampling moments, and accurately obtain the voltage deviation values of all grid - connected nodes at all sampling moments according to all real - time data of all grid - connected nodes at all sampling moments and the total number of all grid - connected nodes in the new - energy sub - area, which is convenient for the subsequent construction of the node analysis matrix.

[0106] Example 5:

[0107] Based on Example 4, for the distributed new - energy sub - area voltage control method, S201: Based on the phase angles, node voltages, and node currents of all grid - connected nodes at all sampling moments, obtain the power loss values of all grid - connected nodes at all sampling moments, including:

[0108]

[0109] Where P i is the power loss value of a single grid - connected node at the i - th sampling moment, with the unit of W, U i is the node voltage of the corresponding grid - connected node at the i - th sampling moment, I i is the node current of the corresponding grid - connected node at the i - th sampling moment, U 0 is the rated voltage of the sub - area power grid, θ i is the phase angle of the corresponding grid - connected node at the i - th sampling moment, cosθ iis the cosine value of the phase angle of the corresponding grid-connected node at the i-th sampling moment, and n is the number of all sampling moments within a preset time period before the current moment.

[0110] In this embodiment, the rated grid voltage is the standard voltage of the new energy distribution network in different scenarios. For example, the standard voltage of the new energy distribution network in the high-voltage power supply scenario is 220 kV.

[0111] The beneficial effects of the above technology are as follows: The power loss values of the corresponding grid-connected nodes at all sampling moments are accurately obtained based on the phase angles of each grid-connected node at all sampling moments. This embodiment provides a method for accurately obtaining the power loss values of the corresponding grid-connected nodes at all sampling moments based on the phase angles of each grid-connected node at all sampling moments.

[0112] Embodiment 6:

[0113] Based on Embodiment 4, for the distributed new energy distribution network voltage control method, S203: Based on the node voltages and node rated voltages of all grid-connected nodes at all sampling moments and the total number of all grid-connected nodes in the new energy distribution network, obtain the voltage offset values of all grid-connected nodes at all sampling moments, including:

[0114]

[0115] where K i is the voltage offset value of a single grid-connected node at the i-th sampling moment, with the unit of V, U i is the node voltage of the corresponding grid-connected node at the i-th sampling moment, U 0 is the rated grid voltage of the distribution network, U τ is the node rated voltage of the corresponding grid-connected node, and n is the number of all sampling moments of a single grid-connected node.

[0116] The beneficial effects of the above technology are as follows: The voltage offset values of the corresponding grid-connected nodes at all sampling moments are accurately obtained based on all real-time data of each grid-connected node at all sampling moments and the total number of all grid-connected nodes in the new energy distribution network. This embodiment provides a method for accurately obtaining the voltage offset values of the corresponding grid-connected nodes at all sampling moments based on all real-time data of each grid-connected node at all sampling moments and the total number of all grid-connected nodes in the new energy distribution network.

[0117] Embodiment 7:

[0118] Based on Embodiment 1, for the distributed new energy distribution network voltage control method, S3: Based on the power loss values of all grid-connected nodes at all sampling moments and the voltage offset values of all grid-connected nodes at all sampling moments, obtain the node analysis matrix of all grid-connected nodes, and based on all node analysis matrices, obtain the new energy distribution network voltage control result, including:

[0119] S301: Obtain the node analysis matrix of all grid-connected nodes based on the power loss values of all grid-connected nodes at all sampling moments and the voltage offset values of all grid-connected nodes at all sampling moments;

[0120] S302: Obtain the voltage control range of the distribution area based on all node analysis matrices, and obtain the voltage control result of the new energy distribution area based on the voltage control range of the distribution area.

[0121] The beneficial effects of the above technology are as follows: According to the power loss values of all grid-connected nodes at all sampling moments and the voltage offset values of all grid-connected nodes at all sampling moments, construct the node analysis matrix of all grid-connected nodes, and use the voltage control range of the distribution area obtained based on all node analysis matrices to more accurately control the voltage of the new energy distribution area and improve the stability of its output voltage.

[0122] Example 8:

[0123] Based on Example 7, for the voltage control method of the distributed new energy distribution area, S301: Obtain the node analysis matrix of all grid-connected nodes based on the power loss values of all grid-connected nodes at all sampling moments and the voltage offset values of all grid-connected nodes at all sampling moments, including:

[0124]

[0125] Among them, S is the node analysis matrix of a single node, and P 1 is the power loss value of the corresponding grid-connected node at the 1st sampling moment, and P 2 is the power loss value of a single grid-connected node at the 2nd sampling moment, and P n is the power loss value of a single grid-connected node at the nth sampling moment, and K 1 is the voltage offset value of a single grid-connected node at the 1st sampling moment, and K 2 is the voltage offset value of a single grid-connected node at the 2nd sampling moment, and K n is the voltage offset value of a single grid-connected node at the nth sampling moment.

[0126] The beneficial effects of the above technology are as follows: According to the power loss values of all grid-connected nodes at all sampling moments and the voltage offset values of all grid-connected nodes at all sampling moments, obtain the node analysis matrix of all grid-connected nodes. This example gives a method for constructing the node analysis matrix of the corresponding grid-connected node based on the power loss value of each grid-connected node at all sampling moments and the voltage offset value of the corresponding grid-connected node at all sampling moments.

[0127] Example 9:

[0128] Based on Embodiment 7, for the distributed new energy substation area voltage control method, S302: Obtain the substation area voltage control range based on all node analysis matrices, and obtain the new energy substation area voltage control result based on the substation area voltage control range, including:

[0129] Select the node analysis matrix with the largest rank from all node analysis matrices as the reference matrix, and use the grid-connected node corresponding to the reference matrix as the reference node;

[0130] Take the product of the absolute value of the difference between the rated voltage of the reference node and the node voltage of the reference node at the current moment and the rank of the reference matrix as the range determination value;

[0131] Take the grid rated voltage of the new energy substation area as the middle value of the voltage control range, and take the range determination value as the voltage difference from the middle value to the boundary value of the substation area voltage control range to obtain the substation area voltage control range;

[0132] Control the grid voltage of the new energy substation area within the substation area voltage control range as the new energy substation area voltage control result.

[0133] In this embodiment, the range determination value is the voltage value for obtaining the substation area voltage control range.

[0134] In this embodiment, the boundary value is the upper limit value or the lower limit value of the substation area voltage control range.

[0135] The beneficial effects of the above technology are: Obtain the range determination value according to all node analysis matrices, and accurately obtain the new energy substation area voltage control result according to the range determination value and the grid rated voltage of the new energy substation area.

[0136] Embodiment 10:

[0137] The present invention provides a distributed new energy substation area voltage control system for executing any one of the distributed new energy substation area voltage control methods in Embodiments 1 to 9, including:

[0138] An acquisition module for acquiring all real-time data of all grid-connected nodes in the new energy substation area within a preset time, and obtaining the phase angles of all grid-connected nodes at all sampling moments based on all real-time data of all grid-connected nodes;

[0139] A calculation module for obtaining the power loss values of all grid-connected nodes at all sampling moments based on the phase angles of all grid-connected nodes at all sampling moments, and obtaining the voltage offset values of all grid-connected nodes at all sampling moments based on all real-time data of all grid-connected nodes at all sampling moments and the total number of all grid-connected nodes in the new energy substation area;

[0140] A control module, configured to obtain a node analysis matrix of all networked nodes based on the power loss values of all networked nodes at all sampling moments and the voltage offset values of all networked nodes at all sampling moments, and obtain a voltage control result of the new energy distribution area based on all node analysis matrices.

[0141] The beneficial effects of the above technology are as follows: The power loss values of all networked nodes at all sampling moments are accurately obtained according to the phase angles of all networked nodes at all sampling moments, the voltage offset values of all networked nodes at all sampling moments are accurately obtained according to all real-time data of all networked nodes at all sampling moments and the total number of all networked nodes in the new energy distribution area, and based on the node analysis matrix of all networked nodes constructed based on the power loss values of all networked nodes at all sampling moments and the voltage offset values of all networked nodes at all sampling moments, a comprehensive analysis is performed on the power loss and voltage offset generated when each networked node accesses the new energy distribution area power grid, which is convenient for accurately obtaining the voltage control result of the new energy distribution area subsequently. Furthermore, the voltage control result of the new energy distribution area is obtained based on all node analysis matrices, which minimizes the loss generated when all networked nodes in the new energy distribution area are connected and efficiently improves the stability of the new energy distribution area power grid.

[0142] Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A distributed renewable energy area voltage control method, characterized in that: include: S1: Obtain all real-time data of all network access nodes in the new energy station area within a preset time, and obtain the phase angles of all network access nodes at all sampling times based on all real-time data of all network access nodes; S2: Based on the phase angles of all network-access nodes at all sampling moments, the power loss values ​​of all network-access nodes at all sampling moments are obtained; based on all real-time data of all network-access nodes at all sampling moments and the total number of all network-access nodes in the new energy substation area, the voltage offset values ​​of all network-access nodes at all sampling moments are obtained; S3: obtaining a node analysis matrix of all network-access nodes based on the power loss values ​​of all network-access nodes at all sampling times and the voltage offset values ​​of all network-access nodes at all sampling times, and obtaining a voltage control result of the new energy substation based on all node analysis matrices; Among them, S3: based on the power loss values ​​of all network-connected nodes at all sampling times and the voltage offset values ​​of all network-connected nodes at all sampling times, the node analysis matrix of all network-connected nodes is obtained, and the voltage control result of the new energy substation is obtained based on all node analysis matrices, including: S301: Obtaining a node analysis matrix of all network-entered nodes based on power loss values ​​of all network-entered nodes at all sampling moments and voltage offset values ​​of all network-entered nodes at all sampling moments; S302: Obtain the substation voltage control range based on all node analysis matrices, and obtain the new energy substation voltage control result based on the substation voltage control range.

2. A distributed renewable energy area voltage control method according to claim 1, characterized in that: S1: Obtain all real-time data of all access nodes in the new energy area within a preset time, and obtain the phase angles of all access nodes at all sampling times based on all real-time data of all access nodes, including: Obtain all real-time data of all network-connected nodes in the new energy area within a preset time before the current moment, where all real-time data include node voltage, node current and node rated voltage; Uniformly sample the preset time period before the current moment based on the preset number of samples to obtain all sampling moments; The phase angles of all network-connected nodes at all sampling moments are obtained based on all real-time data of all network-connected nodes.

3. A distributed new energy area voltage control method according to claim 2, characterized in that: Based on all real-time data of all networked nodes, the phase angles of all networked nodes at all sampling times are obtained, including: Based on the node voltage and node current of all the network-connected nodes in the new energy area within a preset time before the current moment, the initial voltage waveform and initial current waveform of all the network-connected nodes in the new energy area are obtained; Performing waveform continuity judgment on the initial voltage waveform diagram or the initial current waveform diagram of all grid-connected nodes in the new energy station area to obtain a continuity judgment result; When the continuity judgment result of the initial voltage waveform and the initial current waveform is that both the initial voltage waveform and the initial current waveform are continuous, the initial voltage waveform and the initial current waveform are respectively regarded as the final voltage waveform and the final current waveform; When the continuity judgment result of the initial voltage waveform or the initial current waveform is that there is a discontinuous waveform in the initial voltage waveform or the initial current waveform, all discontinuities in the initial voltage waveform or the initial current waveform are obtained, and before each discontinuity, waveform values ​​at moments that are 1 waveform cycle, 2 waveform cycles, 3 waveform cycles, and 4 waveform cycles away from the corresponding discontinuity point are obtained as reference waveform values; And determine whether there is an identical waveform value among the four waveform reference values. If so, the waveform value that appears most frequently among the four waveform reference values ​​is used as the filling waveform value of the corresponding discontinuity point. Otherwise, the average of the four waveform reference values ​​is used as the filling waveform value of the corresponding discontinuity point. Obtaining a final voltage waveform and a final current waveform based on the filled waveform values ​​of all discontinuity points, the initial voltage waveform, and the initial current waveform; The phase angle of each grid-connected node at each sampling moment is obtained based on the final voltage waveform diagram and the final current waveform diagram.

4. A distributed renewable energy area voltage control method according to claim 1, characterized in that: S2: Based on the phase angles of all network-access nodes at all sampling times, the power loss values ​​of all network-access nodes at all sampling times are obtained; based on all real-time data of all network-access nodes at all sampling times and the total number of all network-access nodes in the new energy substation area, the voltage offset values ​​of all network-access nodes at all sampling times are obtained, including: S201: obtaining power loss values ​​of all network-access nodes at all sampling moments based on phase angles, node voltages, and node currents of all network-access nodes at all sampling moments; S202: Determine the node voltage and the node rated voltage of all the network access nodes at all sampling times based on all the real-time data of all the network access nodes at all sampling times; S203: Based on the node voltages and node rated voltages of all network-access nodes at all sampling times and the total number of all network-access nodes in the new energy station area, voltage offset values ​​of all network-access nodes at all sampling times are obtained.

5. A distributed new energy area voltage control method according to claim 4, characterized in that: S201: obtaining power loss values ​​of all network-connected nodes at all sampling times based on the phase angles, node voltages, and node currents of all network-connected nodes at all sampling times, including: Where P i is the power loss value of a single access node at the i-th sampling moment, in W, U i is the node voltage of the corresponding access node at the i-th sampling time, I i is the node current of the corresponding access node at the i-th sampling time, U0 is the rated voltage of the power grid in the substation area, θ i is the phase angle of the corresponding access node at the i-th sampling time, cosθ i is the cosine value of the phase angle of the corresponding network access node at the i-th sampling moment, and n is the number of all sampling moments in the preset time period before the current moment.

6. A distributed new energy area voltage control method according to claim 4, characterized in that: S203: Based on the node voltage and node rated voltage of all network-access nodes at all sampling times and the total number of all network-access nodes in the new energy station area, the voltage offset values ​​of all network-access nodes at all sampling times are obtained, including: In the formula, K i is the voltage offset value of a single access node at the i-th sampling moment, in V, U i is the node voltage of the corresponding access node at the i-th sampling time, U0 is the rated voltage of the power grid in the substation area, and U τ is the node rated voltage of the corresponding grid-connected node, and n is the number of all sampling moments of a single grid-connected node.

7. A distributed renewable energy area voltage control method according to claim 1, characterized in that: S301: Based on the power loss values ​​of all network-entered nodes at all sampling times and the voltage offset values ​​of all network-entered nodes at all sampling times, a node analysis matrix of all network-entered nodes is obtained, including: Among them, S is the node analysis matrix of a single node, P1 is the power loss value of the corresponding access node at the first sampling time, P2 is the power loss value of a single access node at the second sampling time, and P n is the power loss value of a single access node at the nth sampling moment, K1 is the voltage offset value of a single access node at the first sampling moment, K2 is the voltage offset value of a single access node at the second sampling moment, and K n is the voltage offset value of a single access node at the nth sampling moment.

8. A distributed renewable energy area voltage control method according to claim 1, characterized in that: S302: Obtaining a voltage control range of the substation based on all node analysis matrices, and obtaining a voltage control result of the new energy substation based on the voltage control range of the substation, including: A node analysis matrix with the largest matrix rank is selected from all node analysis matrices as a reference matrix, and a network access node corresponding to the reference matrix is ​​selected as a reference node; The absolute value of the difference between the node rated voltage of the reference node and the node voltage of the reference node at the current moment and the rank of the reference matrix are multiplied as the range determination value; The grid rated voltage of the new energy substation is taken as the middle value of the voltage control range, and the range determination value is taken as the voltage difference between the middle value and the boundary value of the substation voltage control range to obtain the substation voltage control range; The grid voltage of the new energy substation is controlled within the substation voltage control range as the new energy substation voltage control result.

9. A distributed new energy area voltage control system, characterized in that: A distributed renewable energy area voltage control method for executing any one of claims 1 to 8, comprising: An acquisition module is used to acquire all real-time data of all network access nodes in the new energy station area within a preset time, and obtain the phase angles of all network access nodes at all sampling times based on all real-time data of all network access nodes; A calculation module is used to obtain the power loss values ​​of all network access nodes at all sampling times based on the phase angles of all network access nodes at all sampling times, and to obtain the voltage offset values ​​of all network access nodes at all sampling times based on all real-time data of all network access nodes at all sampling times and the total number of all network access nodes in the new energy station area; The control module is used to obtain the node analysis matrix of all network-connected nodes based on the power loss values ​​of all network-connected nodes at all sampling times and the voltage offset values ​​of all network-connected nodes at all sampling times, and obtain the voltage control results of the new energy substation based on all node analysis matrices.

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