This paper presents a $P-Q$ coordination based highvoltage ride through (HVRT) control strategy for doubly fed induction generators (DFIGs) based on a combined $Q-V$ control and $P-V$ de-loading control. The active/reactive power injection effect of DFIG on transient overvoltage is firstly analyzed and the reactive power capacity evaluation of DFIG considering its de-loading operation is then conducted. In the proposed strategy, the reactive power limit of DFIG can be flexibly extended during the transient process in coordination with its active power adjustment. As a result, the transient overvoltage caused by DC bipolar block can be effectively suppressed. Moreover, key outer loop parameters such as $Q-V$ control coefficient and de-loading coefficient can be determined based on the voltage level of point of common coupling (PCC) and the available power capacity of DFIG. Finally, case studies based on MATLAB/Simulink simulation are used to verify the effectiveness of the proposed control strategy.

中文翻译：

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考虑高压直流输电系统变流器阻塞的DFIG高压穿越策略

本文提出了一个 $ PQ $ 基于组合的双馈感应发电机（DFIG）的基于协调的高压穿越（HVRT）控制策略 $ QV $ 控制和 $ PV $卸载控制。首先分析了DFIG对瞬态过电压的有功/无功注入效果，然后进行了DFIG的减载操作后的无功功率容量评估。在提出的策略中，DFIG的无功功率极限可以在瞬态过程中与其有功功率调整相协调地灵活扩展。结果，可以有效地抑制由直流双极型块引起的瞬态过电压。此外，关键的外循环参数例如$ QV $控制系数和卸载系数可以基于公共耦合点（PCC）的电压电平和DFIG的可用功率容量来确定。最后，基于MATLAB / Simulink仿真的案例研究被用来验证所提出的控制策略的有效性。