Sungrow Power Supply Co., Ltd.

Changxin Zhang

Yang Liu

Wei Cao

Yong Yu

An off-grid energy storage system includes n energy storage inverters identified by P, P, . . . , Psequentially, direct current sides of the inverters are connected to storage batteries, and alternate current sides of the inverters are connected in parallel. The storage battery connected to the direct current side of Pis identified by B, where j=2, 3, . . . , n. A control system for an output waveform of Phas a voltage-current double loop control structure, and a control system for an output waveform of Phas a current loop control structure. A current loop given value of Pis obtained by adding a current correction value of Pto a current loop given value of P. The current correction value of Pis used for causing Bto have the same operating parameter as B.

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Hefei, China

Changxin Zhang