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首页> 外文期刊>Renewable Power Generation, IET >Controllable DC-link fault current limiter augmentation with DC chopper to improve fault ride-through of DFIG
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Controllable DC-link fault current limiter augmentation with DC chopper to improve fault ride-through of DFIG

机译：带有直流斩波器的可控直流链路故障限流器增强功能可改善DFIG的故障穿越能力

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摘要

Doubly fed induction generator (DFIG) based wind turbines are sensitive to grid faults due to utilising small-scale rotor side converter (RSC). The application of crowbar protection to improve the fault ride-through (FRT) capability of the DFIG converts it to a squirrel cage induction generator, which makes it difficult to comply with grid codes. This study proposes an innovative DC-link controllable fault current limiter (C-FCL) based FRT scheme for the RSC to improve the FRT capability of the DFIG. The proposed scheme replaces the AC crowbar protection and eliminates its disadvantages. The C-FCL does not affect the normal operation of the DFIG. By means of the proposed scheme, rotor over-currents are successfully limited during balanced and unbalanced grid faults, even at zero grid voltage. Also, the C-FCL prevents rotor acceleration and high torque oscillations. In this study, an analysis of the proposed approach is presented in detail. The performance of the proposed scheme is compared with the conventional crowbar protection scheme through simulation studies carried out in power system computer-aided design/electromagnetic transients, including dc software (PSCAD/EMTDC). Moreover, the main concept of the proposed approach is validated with an experimental setup and test results are presented.
机译：由于使用小型转子侧变流器（RSC），基于双馈感应发电机（DFIG）的风力涡轮机对电网故障很敏感。使用撬杠保护来提高DFIG的故障穿越（FRT）能力将其转换为鼠笼式感应发电机，这使其难以遵守电网法规。这项研究针对RSC提出了一种创新的基于DC链路可控故障电流限制器（C-FCL）的FRT方案，以提高DFIG的FRT能力。所提出的方案代替了交流撬棒保护并消除了它的缺点。 C-FCL不会影响DFIG的正常运行。通过提出的方案，即使在电网电压为零的情况下，在平衡和不平衡的电网故障期间也能成功地限制转子的过电流。同样，C-FCL可以防止转子加速和高扭矩振荡。在这项研究中，对提出的方法进行了详细分析。通过在电力系统计算机辅助设计/电磁瞬变（包括dc软件（PSCAD / EMTDC））中进行的仿真研究，将拟议方案的性能与常规撬棍保护方案进行了比较。此外，通过实验设置验证了该方法的主要概念，并给出了测试结果。

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