船舶直流母排电感计算及保护建模方法的研究与验证

针对船舶小容量低压直流电力系统选择性保护设计这一难题,基于直流母排杂散参数分析原理,对计算方法进行研究,提出基于经验电感率的改进计算方法,提高直流母排杂散电感参数的计算精度;另一方面,优化熔断器纯电阻简易模型,对交流熔断器这一保护器件,结合相关文献及短路试验实测数据,建立新的分阶段熔断器模型,并通过MATLAB/Simulink进行仿真,经实际短路试验验证,仿真结果精确度较高,从而验证了直流母排的计算方法与模型的正确性,在实际工程中可提升直流母排系统短路故障选择性保护方案的准确性。

Research and Verification of Inductance Calculation and Protection Modeling Method for Ship DC Bus

Aiming at the difficulty of selective protection design for small-capacity low-voltage DC power system of ships, based on the analysis principle of DC bus stray parameters, the calculation method is improved, and an improved formula based on empirical inductance is proposed to improve the calculation accuracy of DC bus stray inductance parameters On the other hand, the simple model of fuse pure resistance is optimized, and a new staged fuse model is established for AC fuse, combined with relevant literature and measured data of short-circuit test. The simulation results are verified by actual short-circuit test with high accuracy, which verifies the correctness of the calculation method and model of DC bus, and can improve the accuracy of selective protection scheme for short-circuit fault of DC bus system in practical engineering.