不平衡电压暂降下考虑电流峰值的多目标光伏逆变器控制策略

针对光伏逆变器在电网发生不平衡电压暂降时的输出电流过大问题,提出了一种考虑电流峰值、输出有功/无功功率波动、负序电流的多目标光伏逆变器低电压穿越控制策略.首先对多目标电流参考值进行推导,并在此基础上推导含有多目标参数的峰值电流表达式;然后,在多目标参数的确定基础上,运用多目标人工蜂群算法与最大满意度法利用已得到的峰值电...

Multi-objective PV Inverter Control Strategy Considering Current Peak Value under Unbalanced Voltage Sag

For the problem that the output current of photovoltaic inverters is too large when unbalanced voltage sag occurs in power grid, This paper in-troduces a low voltage ride through control strategy for multi-objective photovoltaic inverters is proposed, which considers current peak value, output active/reactive power fluctuation and symmetrical current. First, the multi-target current reference value is derived, on this basis, the ex-pression of peak current with multi-objective parameters is derived. In the determination of multi-objective parameters, the multi-objective artifi-cial bee colony algorithm and the maximum satisfaction method are used to calculate the optimal solution. The peak current is used to control the output active power and reactive power, so that the output active/reactive power fluctuation and negative sequence current are relatively small, and the output current is effectively controlled within the peak current.The effectiveness of the control strategy are verified by building a photo-voltaic simulation model on PSCAD/EMTDC platform, which is consistent with the theoretical analysis.