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首页> 外文期刊>Smart Grid, IEEE Transactions on >Adaptive Hierarchical Voltage Control of a DFIG-Based Wind Power Plant for a Grid Fault
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Adaptive Hierarchical Voltage Control of a DFIG-Based Wind Power Plant for a Grid Fault

机译：基于双馈风力发电机的电网故障的自适应分层电压控制

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摘要

This paper proposes an adaptive hierarchical voltage control scheme of a doubly-fed induction generator (DFIG)-based wind power plant (WPP) that can secure more reserve of reactive power (Q) in the WPP against a grid fault. To achieve this, each DFIG controller employs an adaptive reactive power to voltage (Q-V) characteristic. The proposed adaptive Q-V characteristic is temporally modified depending on the available Q capability of a DFIG; it is dependent on the distance from a DFIG to the point of common coupling (PCC). The proposed characteristic secures more Q reserve in the WPP than the fixed one. Furthermore, it allows DFIGs to promptly inject up to the Q limit, thereby improving the PCC voltage support. To avert an overvoltage after the fault clearance, washout filters are implemented in the WPP and DFIG controllers; they can prevent a surplus Q injection after the fault clearance by eliminating the accumulated values in the proportional-integral controllers of both controllers during the fault. Test results demonstrate that the scheme can improve the voltage support capability during the fault and suppress transient overvoltage after the fault clearance under scenarios of various system and fault conditions; therefore, it helps ensure grid resilience by supporting the voltage stability.
机译：本文提出了一种基于双馈感应发电机（DFIG）的风力发电厂（WPP）的自适应分层电压控制方案，该方案可以确保WPP中的更多无功功率（Q）储备免受电网故障的影响。为了实现这一点，每个DFIG控制器都采用了自适应无功功率对电压（Q-V）的特性。所提出的自适应Q-V特性会根据DFIG的可用Q能力在时间上进行修改；它取决于从DFIG到公共耦合点（PCC）的距离。所提出的特性可确保WPP中的Q预留量比固定值更多。此外，它允许DFIG立即注入Q极限，从而改善PCC电压支持。为了避免故障清除后的过电压，在WPP和DFIG控制器中实现了冲洗滤波器；通过消除故障期间两个控制器的比例积分控制器中的累加值，它们可以防止故障清除后出现多余的Q注入。测试结果表明，该方案可以在各种系统和故障条件下，提高故障期间的电压支持能力，抑制故障清除后的暂态过电压。因此，它通过支持电压稳定性来帮助确保电网弹性。

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