Lu Jiaxin, Zhang Yingchao, Qian Xisen, Long Jiangtao, Zhao Zhengming
This paper proposes a novel virtual impedance method for uninterruptible power system (UPS) inverters with parallel connected capability. To achieve wireless control, the droop control method is adopted. However, the power sharing accuracy is highly sensitive to the output impedance of inverter. So, a virtual output impedance is usually added to alleviate the unbalance of output impedance between each inverter and then, improve power sharing accuracy. The virtual impedance is implemented as the time derivativ…
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