A NEW DECOUPLING CONTROL SCHEME FOR THE PARALLEL OPERATION OF UPS

Lin Xinchun - Duan Shanxu - Kang Yong - Chen Jian

   This paper presents a new decoupling control scheme for paralleling UPS. The proposed control scheme can effectively weaken the coupling between the variable regulating frequency and the voltage amplitude (or between the variable regulating voltage amplitude and phase) As a result, it can avoid the positive feedback and improve the performance of dynamic response. The simulation and experimental results show that the proposed control scheme can not only achieve good dynamic performance but also improve stability.

Keywords: UPS, active power, reactive power, decoupling control, parallel operation, circulating current

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