Assessment of Phase Synchronization Stability of DFIG based WTG System under Large Signal Disturbance

2022 22nd National Power Systems Conference (NPSC) Pub Date : 2022-12-17 DOI:10.1109/NPSC57038.2022.10069840

Upasana Buragohain, N. Senroy

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Abstract

The phase synchronization stability of doubly-fed induction generator (DFIG) based wind turbine generator (WTG) system has been analysed in this paper under large-signal disturbance (grid fault). A second-order model capturing the phase dynamics of the synchronizing unit phase-locked loop (PLL) has been derived by applying model order reduction technique on the standard sixteenth-order model of DFIG based WTG system. The derived ROM has been accurately verified by comparing the small-signal as well as time-domain (TD) simulation results with the full-order model. The bounds on the parameters of the PLL gains for stable grid synchronization have also been assessed analytically based on the developed second-order model of DFIG based WTG system. The analysis has been verified with the help of TD simulations. Additionally, the stable as well as unstable phase synchronization conditions under large-signal disturbance (i.e. severe grid fault) have been assessed numerically by conducting case studies on the second-order as well as full-order model of DFIG based WTG system.

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大信号干扰下基于DFIG的WTG系统相位同步稳定性评估

本文分析了双馈感应发电机(DFIG)型风力发电机组(WTG)系统在大信号干扰(电网故障)下的相位同步稳定性。将模型降阶技术应用于基于DFIG的WTG系统的标准16阶模型，建立了反映同步单元锁相环(PLL)相位动态的二阶模型。通过将小信号和时域(TD)仿真结果与全阶模型进行比较，准确地验证了所推导的ROM。基于所建立的基于DFIG的WTG系统二阶模型，分析了锁相环增益参数的边界。通过TD仿真验证了分析的正确性。此外，通过对基于DFIG的WTG系统二阶和全阶模型的实例研究，对大信号扰动(即严重电网故障)下的稳定和不稳定相位同步条件进行了数值评估。

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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来源期刊

2022 22nd National Power Systems Conference (NPSC)

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