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.
2018,40(6): 89-94 收稿日期：2017-03-21
DOI：10.3404/j.issn.1672-7649.2018.06.018
分类号：TM744
作者简介：王云帆(1993-),女,硕士研究生,研究方向为船舶电力系统
参考文献：
[1] 王寓, 王主丁, 张宗益. 国内外常用短路电流计算标准和方法的比较研究[J]. 电力系统保护控制, 2010, 38(20):148-152.
[2] 马伟明. 舰船动力发展的方向——综合电力系统[J]. 海军工程大学学报, 2004, 14(6):1-11.
[3] DENG Q, LIU X, SOMAN R, et al. Primary and backup protection for fault current limited MVDC shipboard power systems[C]//IEEE Ests. 2015:40-47.
[4] MALJKOVIC'Z, CETTOLO M, PAVLICA M. The impact of the induction motor on short-circuit current[J]. IEEE Industry Applications Magazine, 2001, 7(4):11-17.
[5] 刘楠, 张彦涛. 感应电动机负荷对短路电流影响机理研究[J]. 电网技术, 2012, 36(8):187-192. LIU Nan, ZHANG Yan-tao. Impact of load induction motor on power system short-circuit current calculation[J]. Power System Technology, 2012, 36(8):187-192.
[6] XU Hui-yi. Feedback current impact to distribution network of large capacity motor users[C]//International Conference on E-Product E-Service and E-Entertainment, 2010:1-3.
[7] 吴忠林. 船舶交流电力系统的短路电流[M]. 北京:国防工业出版社, 1983.
[8] 柳彬, 谢炜, 余跃听, 等. 逆变电源短路保护及限流策略[J]. 舰船科学技术, 2011, 33(8):95-98. LIU Bin, XIE Wei, YU Yue-ting, et al. Research on inverter short-ciruit protection and current-limiting strategy[J]. Ship Science and Technology, 2011, 33(8):95-98.
[9] 潘再平. 电机学[M]. 杭州:浙江大学出版社, 2008. 8.
[10] 张志, 彭晓涛, 李晓宁, 等. 改进的多母线船舶电力系统短路电流计算方法[J]. 电网技术, 2013, 37(8):2212-2217. ZHANG Zhi, PENG Xiao-tao, LI Xiao-ning, et al. An improved short-circuit current calculation method for multi-bus ship power system[J]. Power System Technology, 2013, 37(8):2212-2217.
