基于逆变电源组网的电力系统短路电流改进算法  

A improved method for short-circuit current calculation in inverter dominated shipboard power systems

作　　者：王云帆[1] 徐正喜[1] 吴大立[1] WANG Yun-fan;XU Zheng-xi;WU Da-li(Wuhan Second Ship Design and Research Institute, Wuhan 430205, Chin)

机构地区：[1]武汉第二船舶设计研究所,湖北武汉430205

出　　处：《舰船科学技术》2018年第6期89-94,共6页Ship Science and Technology

摘　　要：船舶电力系统的短路电流计算对于系统保护整定和各电气设备的选择性校验具有重要意义。随着综合电力系统的发展和直流电制的应用,逆变电源逐渐取代传统交流发电机成为船舶电力系统交流电网的主电源。由于逆变电源短路时输出电流相对于发电机短路电流数量级大大减小,传统电动机反馈电流计算方法的相对误差被放大不容忽略。本文对比分析了传统交流发电机和逆变电源的短路特性,提出了可应用于逆变电源组网的电力系统中电动机反馈电流的改进算法,通过仿真验证了该改进算法相对于传统算法的优越性。Short-circuit current calculation is of great importance for setting system protection scheme as well as electrical equipment selection. As inverters become the main power source of shipboard ac grid in place of traditional generators,there is a significant reduction on fault current magnitude due to the current-limiting characteristic of power electronic converters. As a result, the error of traditional short-circuit current calculation methods could no more be neglected. This paper firstly gives a comparison of short-circuit characteristics of traditional generators and inverters, then proposes an improved method for motor feedback current calculation. Simulations are carried out and it is proved that the improved calculation method has advantages over traditional methods.

关 键 词：逆变电源 反馈电流 改进算法 误差分析 

分 类 号：TM744[电气工程—电力系统及自动化]