Parallel Operation System of High Frequency modularized UPS Based on Distributed Logic Control

A parallel operation system of UPS based on distributed logic control has been studied in this paper. The mathematic model of the system was constructed and the parallel operation principle was analyzed. Real-time active and reactive power detecting method was given. A control scheme for circumfluence restraining was proposed herein. The parallel operation control technique was put forward and has been successfully applied in the power system where six modular high-frequency UPS operate in parallel. Experimental result was presented to verify the reliability and the feasibility of the parallel UPS system