CN-122026407-A - Optimal configuration method and device of voltage source type equipment, storage medium and computer equipment

CN122026407ACN 122026407 ACN122026407 ACN 122026407ACN-122026407-A

Abstract

The optimal configuration method, the device, the storage medium and the computer equipment for the voltage source equipment comprise the steps of firstly determining a candidate configuration node, after the candidate configuration node is configured as the voltage source equipment, enabling a current power system model to have an optimal first performance index so as to accurately lock a node with the most gain for improving system performance, then configuring the candidate configuration node as the voltage source equipment to update the power system model, calculating a second performance index of a key node in the updated model, intuitively reflecting configured system stability change through a quantization index, then judging whether the second performance index meets preset stability conditions, if so, incorporating the node into a determined configuration node set, removing the node to be selected, entering the next iteration through the updated model, continuing to optimize configuration, and if not, terminating the iteration, wherein the determined configuration node set is the minimum configuration scheme under the premise of meeting system stability.

Inventors

LIU TENG
HUANG XIAOWEI
YUAN JIALU
CAI DONGXIAO
YUAN YI
LI YITONG
ZHONG YILIN
PENG FAXI

Assignees

南方电网科学研究院有限责任公司
中国南方电网有限责任公司

Dates

Publication Date: 20260512
Application Date: 20260205

Claims (10)

1. An optimized configuration method for voltage source type equipment, which is used for determining a minimized configuration scheme and a configuration sequence of the voltage source type equipment on the premise of meeting system stability, is characterized by comprising the following steps: Determining a candidate configuration node based on a current power system model and a set of nodes to be selected, wherein the current power system model has an optimized first performance index after the candidate configuration node is configured as voltage source type equipment; Configuring the candidate configuration nodes into voltage source type equipment, forming an updated power system model, and calculating a second performance index of at least one key node in the updated power system model; Judging whether the second performance index meets a preset stability condition, if so, adding the candidate configuration node into the determined configuration node set, removing the candidate configuration node from the node set to be selected, taking the updated power system model as a current power system model of the next iteration, and returning to execute the current power system model and the node set to be selected to determine a candidate configuration node and subsequent steps; Otherwise, terminating the iteration, and taking the determined configuration node set obtained after the iteration is terminated as an optimal configuration scheme of the voltage source type equipment.
2. The method of optimizing configuration according to claim 1, wherein said determining a candidate configuration node comprises: and performing simulation configuration evaluation on each node in the node set to be selected, and screening candidate configuration nodes from the node set to be selected according to simulation configuration evaluation results.
3. The method for optimizing configuration according to claim 2, wherein the performing the simulation configuration evaluation on each node in the node set to be selected, and selecting candidate configuration nodes from the node set to be selected according to the simulation configuration evaluation result, includes: Establishing an assumed system model after the node is simulated and configured into voltage source equipment for each node in the node set to be selected; And calculating the network equivalent impedance of each hypothesized system model, and selecting a node which minimizes the network equivalent impedance of the corresponding hypothesized system model from the node set to be selected as a candidate configuration node.
4. The optimal configuration method according to claim 3, wherein the building of the hypothetical system model after the node simulation is configured as the voltage source type equipment comprises: Based on the transformation of the node impedance matrix, the port equation of the node is converted from a current source form to a voltage source form to establish a hypothetical system model after the node is simulated and configured as voltage source equipment.
5. The optimal configuration method according to claim 3, wherein the calculating the network equivalent impedance of each hypothesized system model includes: and summing the fundamental frequency self-impedance of each node in each hypothesis system model aiming at each hypothesis system model to obtain the network equivalent impedance of the hypothesis system model.
6. The method according to claim 1, wherein calculating the second performance index of the at least one key node in the updated power system model comprises: Determining at least one key node in the updated power system model; And calculating the short circuit capacity ratio of at least one key node, and taking the short circuit capacity ratio of at least one key node as a second performance index of at least one key node.
7. The optimal configuration method according to claim 1 or 6, wherein when the second performance index is a short-circuit capacity ratio of all nodes in the updated power system model, the determining whether the second performance index meets a preset stability condition includes: Judging whether the short circuit capacity ratio of all the nodes is larger than a preset threshold value or not; if yes, determining that the second performance index meets a preset stability condition; otherwise, determining that the second performance index does not meet a preset stability condition.
8. An optimal configuration device of voltage source type equipment, which is characterized by comprising: The candidate node determining module is used for determining a candidate configuration node based on a current power system model and a node set to be selected, wherein the candidate configuration node is configured as voltage source type equipment, and the current power system model has an optimized first performance index; the performance index calculation module is used for configuring the candidate configuration nodes into voltage source type equipment, forming an updated power system model and calculating a second performance index of at least one key node in the updated power system model; The iteration updating module is used for judging whether the second performance index meets a preset stability condition, if so, adding the candidate configuration node into the determined configuration node set, removing the candidate configuration node set from the node set to be selected, taking the updated power system model as a current power system model of the next iteration, and returning to execute the steps of determining one candidate configuration node and the subsequent steps based on the current power system model and the node set to be selected; And the iteration termination module is used for terminating the iteration and taking the determined configuration node set obtained after the iteration is terminated as an optimal configuration scheme of the voltage source type equipment.
9. A computer-readable storage medium, in which computer-readable instructions are stored which, when executed by one or more processors, cause the one or more processors to perform the steps of the method of optimizing configuration of voltage source equipment according to any one of claims 1 to 7.
10. A computer device includes one or more processors and a memory; Stored in the memory are computer readable instructions which, when executed by the one or more processors, perform the steps of the method of optimizing configuration of voltage source equipment according to any one of claims 1 to 7.

Description

Optimal configuration method and device of voltage source type equipment, storage medium and computer equipment Technical Field The present application relates to the field of power system optimization technologies, and in particular, to a method and apparatus for optimally configuring voltage source equipment, a storage medium, and a computer device. Background With the rapid growth of the grid-connected scale of the new energy and the continuous improvement of the permeability, the positioning of the new energy in the power system is changed from a subordinate role to a dominant role, and the operation mode and the dynamic characteristic of the power system are undergoing profound changes. A large amount of renewable energy sources and other matched resources are connected into a power system, and meanwhile, the power electronic inverter plays a key role as an interface device between the renewable energy sources and a power grid. Power electronic inverters can be further divided into two categories, namely, grid-connected inverters and grid-built inverters. The same grid-connected inverter can be equivalent to a current source with high output parallel impedance, while the grid-formed inverter is equivalent to a voltage source with low output series impedance. Under the background of high-proportion access of a new energy power system, the traditional voltage sources such as synchronous generators and the like in a power grid are gradually replaced by grid-following inverters, so that the system strength is continuously reduced, and the stability margin is insufficient. In order to improve the strength of the power grid, a certain proportion of grid-formed inverters are required to be configured to serve as novel voltage supporting units. At present, the configuration of the voltage source type equipment mainly depends on engineering experience or simple rules, lacks systematic quantitative point selection basis, and is easy to cause two problems, namely unreasonable in configuration position of the voltage source type equipment and incapable of effectively improving system strength, and excessively configuring the voltage source type equipment for pursuing the system strength, and unnecessary investment waste is caused due to high control complexity and high cost. In addition, the existing configuration method based on the generalized short-circuit ratio needs to consider a detailed model of equipment, has requirements on the consistency of the equipment, is difficult to calculate and is limited in applicable scene, and the configuration method based on simulation needs a large amount of calculation power and calculation time. Therefore, a method for scientifically and quantitatively determining the optimal configuration positions and the minimum configuration quantity of the voltage source type equipment is needed, and the economic optimal configuration of the voltage source type equipment and the current source type equipment is realized on the premise of ensuring the stability of the system. Disclosure of Invention The application aims to at least solve one of the technical defects, and particularly aims to solve the technical defects that the configuration of the voltage source type equipment in the prior art mainly depends on engineering experience or simple rules, lacks systematic quantitative point selection basis, easily causes unreasonable configuration positions of the voltage source type equipment, cannot effectively improve the system strength and causes unnecessary investment waste. The application provides an optimal configuration method of voltage source equipment, which is used for determining a minimum configuration scheme and a configuration sequence of the voltage source equipment on the premise of meeting the system stability, and comprises the following steps: Determining a candidate configuration node based on a current power system model and a set of nodes to be selected, wherein the current power system model has an optimized first performance index after the candidate configuration node is configured as voltage source type equipment; Configuring the candidate configuration nodes into voltage source type equipment, forming an updated power system model, and calculating a second performance index of at least one key node in the updated power system model; Judging whether the second performance index meets a preset stability condition, if so, adding the candidate configuration node into the determined configuration node set, removing the candidate configuration node from the node set to be selected, taking the updated power system model as a current power system model of the next iteration, and returning to execute the current power system model and the node set to be selected to determine a candidate configuration node and subsequent steps; Otherwise, terminating the iteration, and taking the determined configuration node set obtained after the iteration is terminated as an optima