改进的多母线船舶电力系统短路电流计算方法

An Improved Short-Circuit Current Calculation Method for Multi-Bus Ship Power System

为便于工程计算,提高计算精度,在传统短路电流计算方法的基础上,提出了基于多母线主汇流排的改进算法。通过对母线间电缆阻抗等效,再将其转移至故障点对侧母线的发电机支路和电动机支路,将其对短路电流的影响归于由发电机馈送至短路点的电流。通过与PSCAD仿真环境下的结果进行比较,证明了改进算法的正确性和有效性。

To facilitate engineering calculation and improve computational accuracy,based on traditional short-circuit calculation methods a main bus-bar based improved algorithm for multi-bus ship power system is proposed.The basic thinking of the proposed algorithm lies in following： when short-circuit fault occurred at one of generator sides,through the equivalence the cable impedances between bus-bars is transferred to generator branch and motor branches connected to opposite bus-bar,thus the influence of main bus-bar on short-circuit current is incorporated in the current that is fed from generator to the short-circuit point.The proposed improved algorithm is simulated by PSCAD,and the simulation results are compared with calculation results by traditional short-circuit current calculation method,and comparison result shows that the proposed calculation method is accurate and effective.