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不平衡电压环境下并网逆变器的输出功率波动和电流质量相互对立。首先推导了不平衡电压环境下逆变器输出功率无波动和输出电流对称正弦之间的内在联系,分析影响功率波动和电流质量的关键因素。在此基础上,提出一种功率波动抑制与电流平衡协调控制策略,通过调节参考指令中的谐波分量大小实现逆变器电流质量和功率波动间的协调控制。所提策略实现简单,参考指令计算过程无需采用电压/电流正负序分离环节,也无需任何低通滤波器或者陷波器。仿真和实验验证了所提策略的可行性和有效性。
Under unbalanced voltage environment, the output power fluctuation and current quality of grid-connected inverter are opposite to each other. First of all, it deduces the inherent relationship between the inverter output power without fluctuation and the symmetrical sine of the output current in the unbalanced voltage environment, and analyzes the key factors that affect the power fluctuation and the current quality. On this basis, a coordinated control strategy of power fluctuation suppression and current balance is proposed. By adjusting the magnitude of harmonic components in reference commands, the coordination between inverter current quality and power fluctuation can be achieved. The proposed strategy is simple and does not require the use of voltage / current positive and negative sequence separation steps, nor any low-pass filter or trap. Simulation and experiment verify the feasibility and effectiveness of the proposed strategy.