A low cost and high reliability control scheme in parallel operation for 400Hz power supply

Abstract

In this paper, a low cost and high reliability control scheme is proposed for 400 Hz UPS system operated in parallel.The proposed control scheme is consisted of two parts which are synchronization and load sharing control. The synchronization control is achieved by discrete logic ICs and analog circuit. The load sharing control is realized by current transformers (CTs) without any controller. Therefore, this proposed control scheme is rather simple and the cost may be decreased, compared with control scheme using expensive controller such as DSP and CAN. The practical feasibility of the proposed control scheme is proved by simulation.