At present,the marine integrated power system using medium-voltage DC power supply and distribution has grounding resistance at both the generator end and the load end,which has a great impact on the online detection of the insulation resistance of its power grid.Therefore,an im-proved injection method online insulation detection scheme was proposed to eliminate the influence of system grounding resistance through the acquisition of external power supply and load status.Firstly,at the grounding resistance of the rectifier generator,the forward and reverse parallel DC power sup-plies were respectively connected,and the analytical expression of the system insulation resistance was obtained by using the power superposition method.And then,the real-time insulation resistance value of the DC bus was converted by using the real-time acquisition of the switch status of the inverter grounding resistance cabinet.Finally,the whole system simulation model was built to verify that the measurement accuracy of the proposed scheme meets the engineering requirements,which provides a theoretical basis for the online detection of bus insulation in the integrated power system.
关键词
船舶综合电力系统/中压直流/绝缘检测/信号注入法
Key words
ship integrated power system/medium voltage DC/insulation detection/signal injection method
维普
万方数据