通过控制电压降期间的磁链中和电流改善dfig型并网风电场的暂态稳定性

IF 2.7 Q2 MULTIDISCIPLINARY SCIENCES

Scientific African Pub Date : 2025-05-10 DOI:10.1016/j.sciaf.2025.e02745

Azeddine Loulijat , Abdelilah Hilali , Mohamed Makhad , Hamid Chojaa , Said Mahfoud , Mishari Metab Almalki , Almoataz Y. Abdelaziz , Mahmoud A. Mossa

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引用次数: 0

摘要

为了保护双馈感应发电机（DFIG）免受电压降的影响，必须保持其暂态稳定性。采用被动“撬棍-直流斩波”技术对DFIGs进行保护。然而，对于某些瞬态配置文件来说，这可能还不够。为此，采用低电压穿越（LVRT）实现磁通中和电流控制（CFNC）进行暂态响应评估。此外，在DFIG上建立了两个电路（定子和转子）的感应电动势（IEFs）模型，并比较了加CFNC和不加CFNC的DFIG模型的性能。考虑有和无定子/转子耦合动力学两种情况，对对称三相故障的系统行为进行了研究。利用MATLAB/Simulink进行数值模拟和时域仿真，分析了DFIG系统在故障条件下的暂态行为。没有进行任何实验测试，今后的工作将着眼于实时实施，以评估实际可行性。对DFIG参数进行了分析和比较，包括0.69 kV输出电压、机械速度响应、电磁转矩变化、转子和定子直接正交（d-q）轴电流、22 kV母线终端电压和DC-Link电压。结果表明，CFNC将振荡持续时间缩短了50%以上，稳定电流的时间从3.5 s缩短到1.18 s， DC-Link电压的稳定时间从3.5 s缩短到1.1 s，显著提高了LVRT的性能和瞬态稳定性。

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Transient stability improvement of a DFIG-based network-connected wind power plant by control of the flux neutralization current during the voltage drop

In order to protect a doubly fed induction generator (DFIG) against voltage drops, it is essential to maintain its transient stability. The passive "crowbar and dc-chopper" technique has been employed to protect DFIGs. However, it may not be sufficient for some of the transient profiles. For this reason, the Low Voltage Ride Through (LVRT) has been employed by implementing Control of Flux Neutralization Current (CFNC) for transient response assessment. Moreover, the induced electromotive forces (IEFs) in both circuits (stator and rotor) were modeled on the DFIG, and the comparative performance of the DFIG models with and without CFNC was examined. The system behavior was examined for symmetrical three-phase faults, considering the cases with and without the stator/rotor coupling dynamics. This study uses numerical modeling and time-domain simulations with MATLAB/Simulink to analyze the transient behavior of the DFIG system under fault conditions. No experimental tests have been carried out, and future work will aim at a real-time implementation to assess practical feasibility. DFIG quantities were analyzed and compared, including 0.69 kV output voltage, mechanical speed response, electromagnetic torque variations, rotor and stator direct quadrature (d-q) axis currents, 22 kV bus terminal voltage, and, a DC-Link voltage. The results reveal that CFNC reduces the duration of oscillations by more than 50%, stabilizing currents in 1.18 s instead of 3.5 s and the DC-Link voltage in 1.1 s instead of 3.5 s, significantly improving LVRT capability and transient stability.

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