Control circuit for an invertor operable in an individual mode and an interconnection mode.

摘要

A control circuit for invertor, which is capable of compensating an instantaneous variation of the power system without decreasing of the stability of the control circuit upon the synchronous-interconnection mode being in advance of interconnection mode. The control circuit for an invertor converting DC voltage to AC voltage operable in an individual mode and an interconnection mode, includes a synchronous compensating circuit in which when the invertor is operating in a power system synchronous operation mode under control of the synchronous-interconnection control system, a quantity of an instantaneous voltage variation occurring in the power system is separated into a quantity of the variation of the component in same phase with a reference voltage vector of the output voltage of the invertor and a quantity of the variation of the component orthogonal to the reference voltage vector in order to detect respectively, and the detected variation quantities are respectively added to the outputs of a voltage adjuster and a phase adjuster in the synchronous-interconnection control system. <IMAGE>