舰船电力系统中阻抗母线差动保护仿真研究

摘要

Traditional time and current principle is not competent for the effective protection of modern power system of large vessels,especially the integrated power system,so it's necessary to study new protecting method. Using the ratio check differential current protection method for terrestrial electric network for reference ,the intermediate impedance bus differential protection of the simplified vessel power system of one single generator with pure resistance load was simulated in PSCAD/EMTDC and then experimented. The simulative model of intermediate impedance bus differential protective system for vessel ring network was constructed with specific simulation and analysis. The research shows that the intermediate impedance bus differential protection method can distinguish internal and external faults effectively, and the protecting actions are accurate and reliable. So this method is capable for the effective protection of large vessel power system.%现代大型舰船电力系统,特别是综合电力系统,由于不同工况下系统在网功率差别很大,传统的时间电流原则保护方法已不能满足其有效保护的要求,因此必须研究新型保护方法.基于此,借鉴陆地电网比率制动式电流差动保护方案的中阻抗母线差动保护方法,对单机带纯电阻负载的简化舰船电力系统进行了基于PSCAD/EMTDC的中阻抗母线差动保护仿真及实验研究,构建了舰船环形网络中阻抗母线差动保护仿真系统,进行了深入的仿真分析.结果表明.中阻抗母线差动保护方法能有效地区分内部、外部短路故障,保护动作可靠、准确,可以满足大型舰船电力系统母线有效保护的要求.