Equivalent model of multi-type distributed generators under faults with fast-iterative calculation method based on improved PSO algorithm

Protection and Control of Modern Power Systems

Xiangping Kong¹  Fang Shi²  Xinxin Gu³  Jinyuan Song⁴  Guangen Xie⁴  Puyu Wang⁴  Fangyu Liang⁴  Xiao-Ping Zhang⁵ 

[1] Jiangsu Electric Power Research Institute, Jiangsu Electric Power Company, 211103, Nanjing, Jiangsu, China;Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education, Shandong University, 250061, Jinan, China;Nanjing GWDR Relays Technologies Co., 210032, Nanjing, Jiangsu, China;School of Automation, Nanjing University of Science & Technology (NUST), 210094, Nanjing, Jiangsu, China;School of Engineering, University of Birmingham, B15 2TT, Edgbaston, Birmingham, UK;

关键词: Multi-type distributed generators (DGs);    Fault current characteristics;    Equivalent model;    Fast-iterative calculation method;    Improved particle swarm optimization (PSO);   

DOI  :  10.1186/s41601-021-00207-w

来源: Springer

【 摘 要 】

There are various types of distributed generators (DGs) with different grid integration strategies. The transient characteristics of the fault currents provided by the DGs are different to those of conventional synchronous generators. In this paper, a distribution network with multi-type DGs is investigated, including consideration of DG low-voltage ride through (LVRT). The fault current characteristics of two typical DGs, i.e. an inverter-interfaced distributed generator (IIDG) and a doubly-fed induction generator (DFIG), are analyzed, considering the specific operation modes. Based on analysis of the fault characteristics, an equivalent model of the multi-type DGs under symmetrical/asymmetrical fault conditions is established. A fast-iterative fault calculation method for enhancing the calculation efficiency while avoiding local convergence is then proposed using an improved particle swarm optimization (PSO) algorithm. A simulation system of the distribution network with multi-type DGs is established in PSCAD/EMTDC. The simulation results validate the high accuracy and calculation efficiency of the proposed calculation method of the fault components. This can assist in the settings of the protection threshold.

【 授权许可】

CC BY