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首页> 外文期刊>Generation, Transmission & Distribution, IET >Fast inrush voltage and current restraining method for droop controlled inverter during grid fault clearance in distribution network
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Fast inrush voltage and current restraining method for droop controlled inverter during grid fault clearance in distribution network

机译：配电网电网故障排除期间下垂控制逆变器的快速浪涌电压和电流抑制方法

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摘要

Control mode switching strategy of droop controlled inverter can effectively avoid overcurrent during grid fault, but it is easy to cause inrush voltage and current during grid fault clearance, which leads to the failure of fault ride through process of the distribution network. In this study, a new control mode re-switching method is proposed on the basis of restricting the outputs of the off-line controllers, which can make sure that the inrush voltage and current are suppressed and return to the normal condition quickly. First, the dynamic characteristics of fault current of droop controlled inverter are analysed. Then, the instantaneous inrush voltage and current caused by the output saturations of voltage controller and power controller before the re-switching process are mainly discussed. This method takes full advantage of integration of the existing off-line controllers to limit the output saturations, which can make the inrush problems well solved, and reduce the influence on grid connected inverters and the distribution network. Simulation results verify the validity of the theoretical analysis.
机译：降压逆变器的控制模式切换策略可以有效避免电网故障时的过电流，但在电网故障清除时容易引起浪涌电压和电流，从而导致故障贯穿配电网过程。本文在限制离线控制器输出的基础上，提出了一种新的控制方式切换方法，可以确保抑制浪涌电压和电流并迅速恢复到正常状态。首先，分析了下垂控制逆变器故障电流的动态特性。然后，主要讨论了在重新切换过程之前，电压控制器和功率控制器的输出饱和引起的瞬时浪涌电压和电流。这种方法充分利用了现有离线控制器的集成优势，可以限制输出饱和，从而可以很好地解决浪涌问题，并减少对并网逆变器和配电网络的影响。仿真结果验证了理论分析的正确性。

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