| 引用本文: | 李鸿鑫,曾 江,张华赢,等.基于端口补偿法的配网故障下主配网暂降分析[J].电力系统保护与控制,2020,48(16):45-53. |
| LI Hongxin,ZENG Jiang,ZHANG Huaying,et al.Voltage sag analysis of a transmission and distribution network based on a compensationmethod under a distribution network fault[J].Power System Protection and Control,2020,48(16):45-53 |
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| 摘要: |
| 针对目前配网短路故障计算仅考虑配网部分的变化而未能反映主配网耦合关系及变压器影响的问题，提出一种基于端口补偿法的主配网暂降分析方法。根据配网拓扑和运行数据建立配网常态模型。并根据配网故障信息建立配网故障模型，结合变压器三序模型计算配网在变压器高压侧母线处的等值。建立主网模型时将配网常态等值计入主网节点导纳阵中，应用补偿法计算故障下的配网等值模型变化量对主网状态的影响。该影响值与故障前的网络状态量叠加后确定主网暂降状态，进而确定配网暂降状态，最终实现主配网暂降分析。通过对某城市电网系统进行仿真计算，验证了所提算法的可行性和有效性。 |
| 关键词: 短路计算 配网等值 端口补偿法 叠加 主配网暂降分析 |
| DOI：DOI: 10.19783/j.cnki.pspc.191123 |
| 分类号: |
| 基金项目:国家自然科学基金项目资助(51777078)；深圳供电局有限公司科技项目资助(SZKJXM20160169) |
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| Voltage sag analysis of a transmission and distribution network based on a compensationmethod under a distribution network fault |
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LI Hongxin1, ZENG Jiang2, ZHANG Huaying1, AI Jingwen1, LI Yan1, YU Tao2, QIU Guobin2
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(1. Electric Power Research Institute, Shenzhen Power Supply Bureau Co., Ltd., Shenzhen 518000, China;
2. School of Electric Power, South China University of Technology, Guangzhou 510640, China)
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| Abstract: |
| There is a problem that the calculation of short-circuit faults in a distribution network only considers the distribution network, and neglects the influence of the transformer and the coupling relationship of transmission and the distribution network. This paper proposes a solution based on compensation. Based on the topology and operational data of a distribution network, a normal model is established. According to the type and location of a distribution network short circuit fault, the equivalence of a distribution network under short circuit fault is established. A three-sequence model of a transformer is used to establish the equivalence of the distribution network at the bus bar of the high voltage side of the transformer. Incorporating the equivalence of the distribution network’s normal form into a node admittance matrix and combining with the variation of equivalence of distribution network before and after the fault occurs, the variation on the state of the transmission network is calculated using the compensation method. After the variation is superposed with the network state before the fault, the state of transmission and distribution network is determined successively, and finally voltage sag analysis of transmission and distribution network is completed. The feasibility and accuracy of the proposed algorithm are verified by simulating certain urban power systems.
This work is supported by National Natural Science Foundation of China (No. 51777078) and Science and Technology Project of Shenzhen Power Supply Bureau Co., Ltd. (No. SZKJXM20160169). |
| Key words: short circuit calculation equivalence of distribution network compensation method superposition voltage sag analysis of transmission and distribution network |
