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Two-Stage Variable Proportion Coefficient Based Frequency Support of Grid-Connected DFIG-WTs
IEEE Transactions on Power Systems ( IF 6.6 ) Pub Date : 2020-03-01 , DOI: 10.1109/tpwrs.2019.2943520
Xiaotao Peng , Wei Yao , Cai Yan , Jinyu Wen , Shijie Cheng

This paper proposes a variable proportion coefficient based control scheme for the doubly-fed induction generator based wind turbines (DFIG-WTs) to implement frequency support by regulating rotor speed. To reduce the adverse impact caused by regulating DFIG-WT on the dynamic characteristic of the grid frequency, a two-stage switching control scheme is employed for the proposed method. In the first stage, the variable proportion coefficient is designed for emulating the virtual inertia of the DFIG-WT to provide inertia response. In the second stage, a fuzzy control scheme is employed to design the variable proportion coefficient for both quickly restoring the maximum power point tracking (MPPT) operation of DFIG-WTs and avoiding the secondary frequency drop to system. Case studies are undertaken based on WSCC 9-bus and IEEE 39-bus power systems, respectively. Simulation results show that the proposed control scheme can not only make grid-connected DFIG-WTs provide the friendly frequency support, but also help them to fully use the frequency regulation ability of synchronous generators for quickly restoring the MPPT operation.

中文翻译:

基于两级可变比例系数的并网 DFIG-WT 频率支持

本文提出了一种基于双馈感应发电机的风力涡轮机 (DFIG-WT) 的基于可变比例系数的控制方案,通过调节转子速度来实现频率支持。为了减少调节DFIG-WT对电网频率动态特性的不利影响,该方法采用两级切换控制方案。在第一阶段,可变比例系数被设计用于模拟DFIG-WT的虚拟惯性,以提供惯性响应。在第二阶段,采用模糊控制方案设计可变比例系数,以快速恢复双馈风力发电机的最大功率点跟踪(MPPT)运行并避免二次频率下降到系统。案例研究基于 WSCC 9 总线和 IEEE 39 总线电源系统,分别。仿真结果表明,所提出的控制方案不仅可以使并网双馈发电机提供友好的频率支持,还可以帮助其充分利用同步发电机的调频能力,快速恢复MPPT运行。
更新日期:2020-03-01
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