Department of Computer Science, University of Alabama at Birmingham, Birmingham, AL 35294, USA.
Department of Electrical Engineering, University of Engineering and Technology, Peshawar 25000, Pakistan.
Sensors (Basel). 2022 Nov 30;22(23):9314. doi: 10.3390/s22239314.
Large-scale wind power integration has raised concerns about the reliability and stability of power systems. The rotor circuit of a doubly fed induction generator (DFIG) is highly vulnerable to unexpected voltage dips, which can cause considerable electromotive force in the circuit. Consequently, the DFIG must fulfil the fault-ride through (FRT) criteria to ensure the system's performance and contribute to voltage regulation during severe grid outages. This paper provides a hybrid solution for DFIG wind turbines with FRT capabilities, using both a modified switch-type fault current limiter (MSFTCL) and a direct current (DC) chopper. The proposed system has the merit of keeping the rotor current and the DC-link voltage within the permissible limits, enhancing the FRT capability of generators. Moreover, the boundness of supply voltage into its reference value ensures dynamic stability during symmetric and asymmetric grid failures. Further, electromagnetic torque variations are significantly reduced during fault events. Finally, the performance validation of the proposed scheme is performed in a simulation setup, and the results are compared with the existing sliding mode control (SMC) and proportional-integral (PI) controller-based approaches. The comparison results show that a hybrid strategy with advanced controllers provides superior performance for all critical parameters.
大规模风力发电的引入引发了人们对电力系统可靠性和稳定性的担忧。双馈感应发电机（DFIG）的转子电路极易受到意外电压骤降的影响，这可能会在电路中产生相当大的电动势。因此，DFIG 必须满足故障穿越（FRT）标准，以确保系统的性能，并在严重电网故障期间有助于电压调节。本文提出了一种具有 FRT 能力的 DFIG 风力涡轮机的混合解决方案，使用改进的开关型故障电流限制器（MSFTCL）和直流（DC）斩波器。所提出的系统具有将转子电流和直流母线电压保持在允许范围内的优点，从而增强了发电机的 FRT 能力。此外，通过将供电电压限制在其参考值内，确保了在对称和不对称电网故障期间的动态稳定性。此外，在故障事件期间，电磁转矩变化显著减小。最后，在仿真设置中对所提出的方案进行了性能验证，并将结果与现有的滑模控制（SMC）和基于比例积分（PI）控制器的方法进行了比较。比较结果表明，具有先进控制器的混合策略为所有关键参数提供了卓越的性能。
