基于逆变电源组网的船舶电力系统短路电流计算方法适用性研究  

Research on Short-circuit Current Calculation Methods for Inverter Dominated Shipboard Power System

作　　者：王云帆[1] 徐正喜[1] 吴大立[1] Wang Yunfan;Xu Zhengxi;Wu Dali(Wuhan 2nd Ship Design and Research Institute, Wuhan430205, China)

机构地区：[1]武汉第二船舶设计研究所,武汉430205

出　　处：《船电技术》2017年第7期55-59,共5页Marine Electric & Electronic Engineering

摘　　要：船舶电力系统的短路电流计算是系统保护设计和整定的依据。常用的船舶电力系统短路电流计算方法由于采取各种近似和等效方法对结果造成了一定误差,在基于逆变电源组网的船舶电力系统中,由于逆变电源相对于传统发电机输出短路电流数量级的减小,这种近似算法的相对误差被放大不宜忽略。本文首先分析了采用电力电子技术的逆变电源的短路特性,然后搭建了基于逆变电源组网的船舶电力系统仿真模型,基于此对常用标准中等效平均电动机短路电流计算方法的误差进行分析,并提出了相应的修正建议。Short-circuit current calculation is a basis for setting system protection scheme as well aselectrical equipment selection.As inverters become the main power source of AC grid in shipboard powersystem in place of traditional generators,there is a significant reduction on fault current magnitude due tothe current-limiting characteristic of power electronic converters.As a result,the error of traditionalshort-circuit current calculation method can no more be neglected.This paper firstly analyzes theshort-circuit characteristics of inverter,then sets up a simulation model of inverter networking in ship powersystem,analyzes the error of the traditional calculation method of equivalent average short-circuit currentfor motors in inverter dominated shipboard power system,and proposes the corresponding correctionalsuggestions.

关 键 词：逆变电源 短路电流计算 反馈电流 误差分析 

分 类 号：TM744[电气工程—电力系统及自动化]