Abstract
Parallel operating system of voltage source inverter with another inverters or the utility source is sensitive to disturbances from the loads or the another sources and can easily be damaged by over current.
So extremely careful attention should be given for the system design of parallel operating system.
In this paper, types of system configuration, methods of parallel operation control, matters which demand special attentions, means of protection against failure are summarized, and several new methods are proposed. Then features and problems of these systems will be discussed.
