A HVRT Control Strategy for DFIG Considering Dynamic Changes of Stator Flux and Dynamic Reactive Power Compensation

2022 12th International Conference on Power and Energy Systems (ICPES) Pub Date : 2022-12-23 DOI:10.1109/ICPES56491.2022.10072439

Jing Chen, Jiandong Duan, Zhenghao Qi, Tong Gao, Yang Zhang

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Abstract

In recent years, the proportion of wind power generation in the grid has become higher and higher. Doubly-fed induction generator (DFIG) has become the mainstream wind turbine of distributed wind farms. For DFIG, large rotor currents and DC bus voltages will be generated when the grid voltage swells. Without protection, the converter may be damaged. It is essential to enhance the fault ride through capability of DFIG and reduce the impact on the stable operation of power grid. Therefore, a high voltage ride-through (HVRT) control strategy considering dynamic reactive power compensation is investigated to address this problem. Firstly, the original control strategy is described. Secondly, variation of the stator flux is considered during the grid fault. Thirdly, the grid-side converter (GSC) and the rotor-side converter (RSC) output reactive current to provide reactive power compensation. Finally, simulation results analyses are conducted by MATLAB/Simulink to evaluate the effectiveness of the proposed strategy.

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考虑定子磁链动态变化和动态无功补偿的DFIG HVRT控制策略

近年来，风力发电在电网中的比重越来越高。双馈感应发电机(DFIG)已成为分布式风电场的主流风力发电机组。对于DFIG，当电网电压膨胀时，会产生较大的转子电流和直流母线电压。没有保护，转换器可能会损坏。提高DFIG的故障穿越能力，降低对电网稳定运行的影响是十分必要的。为此，研究了一种考虑动态无功补偿的高压穿越(HVRT)控制策略。首先，对原控制策略进行了描述。其次，考虑了电网故障时定子磁链的变化。再次，电网侧变流器(GSC)和转子侧变流器(RSC)输出无功电流，提供无功补偿。最后，利用MATLAB/Simulink对仿真结果进行了分析，以评价所提策略的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2022 12th International Conference on Power and Energy Systems (ICPES)

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