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The LVRT of the BESS under both balance and unbalance grid fault
Author(s): 
Pages: 62-67
Year: Issue:  10
Journal: Power System Protection and Control

Keyword:  BESSPCSpositive-negative sequence composite mathematical modelLVRT;
Abstract: 为了兼顾储能系统(Energy Storage System, ESS)对称及不对称电压故障时低电压穿越(Low Voltage Ride Through, LVRT)需要,针对目前其PCS控制的一些不足,重点研究了其实现LVRT的控制方法.建立了PCS的正、负序复合数学模型,设计了双d-q不平衡控制策略实现正、负序电流的有效控制.在此基础上,通过指令切换来实现LVRT过程中的有功、无功电流的分配与限制.并用PSCAD对一84 kW的电池储能系统进行了仿真,仿真结果表明所建立的正负序复合模型以及控制方法能够满足电网电压对称及不对称故障时的LVRT要求.
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