Improving fault ride-through capability for doubly-fed induction generator based on improved system structure and corresponding control scheme

IF 1.6 Q4 ENERGY & FUELS IET Energy Systems Integration Pub Date : 2023-04-03 DOI:10.1049/esi2.12097
Long Xian, Lizhen Wu, Xiaoying Zhang, TingTing Pei
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Abstract

Although there are many methods to improve the fault ride-through (FRT) capability of doubly-fed induction generator (DFIG) systems at present, each method has its shortcomings, especially the applicability under different voltage dips (VDs), so an improved system structure with a dynamic switching topology and a corresponding control scheme is proposed. Based on the mechanism analysis that the series impedance of the stator can effectively reduce the overcurrent on the rotor side, and considering the feasibility of the FRT scheme in engineering, the dynamic switching topology is designed. The selection of theoretical parameters in different cases is also analysed and designed. Simultaneously, to cooperate with the hardware measures, the control scheme of the rotor side converter (RSC) under different conditions is also improved. The RSC can use the control scheme of active flux attenuation to effectively and quickly reduce the overcurrent on the rotor side, and use reactive power support to accelerate the voltage recovery. The novelty of the FRT scheme is that the scheme can dynamically adjust the topology structure and control scheme under different voltage dips. Thus, its ride-through performance during fault is better under different conditions. A simulation model of the improved system structure and control scheme is built on the MATLAB/Simulink platform. Through the comparison of simulation data, the validity and correctness of the proposed FRT scheme are verified.

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基于改进的系统结构和相应的控制方案,提高双馈感应发电机的故障穿越能力
尽管目前有许多方法可以提高双馈异步发电机(DFIG)系统的故障穿越(FRT)能力,但每种方法都有其不足之处,尤其是在不同电压骤降(VD)下的适用性,因此提出了一种改进的动态开关拓扑系统结构和相应的控制方案。基于定子串联阻抗能有效降低转子侧过电流的机理分析,并考虑到 FRT 方案在工程中的可行性,设计了动态开关拓扑结构。还分析和设计了不同情况下的理论参数选择。同时,为配合硬件措施,还改进了转子侧变流器(RSC)在不同条件下的控制方案。RSC 可以利用有功磁通衰减的控制方案有效、快速地降低转子侧的过电流,并利用无功功率支持加速电压恢复。FRT 方案的新颖之处在于,该方案可在不同电压骤降情况下动态调整拓扑结构和控制方案。因此,该方案在不同条件下的故障穿越性能更佳。在 MATLAB/Simulink 平台上建立了改进后的系统结构和控制方案的仿真模型。通过仿真数据的对比,验证了所提出的故障穿越方案的有效性和正确性。
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来源期刊
IET Energy Systems Integration
IET Energy Systems Integration Engineering-Engineering (miscellaneous)
CiteScore
5.90
自引率
8.30%
发文量
29
审稿时长
11 weeks
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