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Adaptive current-sharing control strategy with virtual circulating impedance for parallel operation of UPS

An adaptive current-sharing control strategy with virtual circulating impedance for single-phase parallel connected UPS is proposed in this paper. The current-sharing scheme of the paralleled system is developed and the theoretical analysis of the virtual circulating impedance is studied. The impact of the virtual circulating impedance on the stability of the paralleled system is also discussed. Moreover, to improve the current sharing accuracy during variable operating conditions, the virtual circulating impedance of inverter is adjusted automatically. Experimental results are provided to validate the feasibility of the proposed control strategy.