This paper introduces the problem analysis and treatment scheme for the energy storage cabinet of the static control rod drive mechanism(CRDM)power supply system in a nuclear power project,which failed to normally access the busbar.Through detailed analysis of the system structure and control principles,it was found that the instantaneous change in the output voltage of the rectifier cabinet during load mutation led to an increase in the busbar voltage,which interfered with the access logic of the energy storage cabinet.In response,two improvement schemes were proposed,and after comprehensively considering the implementation difficulty and cost-benefit,the method of adding the delay detection voltage to the control software of the energy storage cabinet was selected.Experimental verification showed that the optimized energy storage cabinet could successfully access the busbar,and the inrush current met safety requirements,effectively enhancing the reliability and safety of the system.
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