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  

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

作　　者：佘然 徐永海 蒋海玮 SHE Ran;XU Yonghai;JIANG Haiwei(State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Beijing 102206,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京102206

出　　处：《电源学报》2022年第2期88-97,共10页Journal of Power Supply

基　　金：国家自然科学基金资助项目(51277069)。

摘　　要：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流对输出的有功功率与无功功率进行控制,使得输出有功/无功功率波动和负序电流较小,并使输出电流峰值满足控制要求。最后通过在PSCAD/EMTDC平台搭建光伏仿真模型,验证了控制策略的有效性。Aimed at the problem that the output current from a PV inverter is too large when unbalanced voltage sag occurs in power grid,a low voltage ride through control strategy for a multi-objective PV inverter is proposed,which considers current peak value,output active/reactive power fluctuations and negative-sequence current.First,the multiobjective current reference value is derived,based on which the expression of peak current value containing multi-objective parameters is given.Then,in the determination of multi-objective parameters,the multi-objective artificial bee colony algorithm and the maximum satisfaction method are applied.The obtained peak current value is used to control the output active/reactive power,so that the output active/reactive power fluctuations and negative-sequence current are relatively small and the output current peak value satisfies the control requirements.The effectiveness of the proposed control strategy is verified by a PV simulation model built on the PSCAD/EMTDC platform,which is consistent with the theoretical analysis.

关 键 词：电压暂降 电流峰值 多目标 光伏逆变器 

分 类 号：TM615[电气工程—电力系统及自动化]