Transient Interaction Mechanism Analysis and Stability Control of Multi-Paralleled DFIG-Based WTs During Asymmetrical Grid Faults

IF 8.6 1区 工程技术 Q1 ENERGY & FUELS IEEE Transactions on Sustainable Energy Pub Date : 2024-09-17 DOI:10.1109/TSTE.2024.3462789
Yi Luo;Jun Yao;Dong Yang;Linsheng Zhao;Rongyu Jin
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Abstract

In this article, from the perspective of DC-link voltage (DCV) control, the transient interaction mechanism of multi-paralleled doubly fed induction generator (DFIG)-based wind turbines (WTs) is investigated during asymmetrical grid faults. Firstly, considering the coupling characteristics of positive and negative sequence (PNS) components and the interaction characteristics between the rotor side converter (RSC) and grid side converter (GSC), a large-signal nonlinear model of multiple-parallel DFIG-based WTs in DC-link voltage control time-scale is obtained. Furthermore, by using the energy function method, the dynamic interaction mechanism of multiple-parallel DFIG-based WTs is analyzed. The influence of different parameters on the transient characteristics of DC-link voltage is analyzed by using phase trajectory diagram. The dominant factors affecting the transient stability of the WTs and stability level of DC-link voltage are obtained. In addition, considering the interaction among WTs, the dynamic interaction between RSC and GSC, as well as the requirement of grid codes, a transient stability optimization strategy during asymmetrical grid faults is proposed to improve the transient stability level of the DC-link voltage and the transient stability of multiple-parallel DFIG-based WTs. Finally, simulation and experimental results validate the correctness of theoretical analysis and the effectiveness of the proposed strategy.
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基于多并联双馈风力发电机的风电机组在非对称电网故障期间的暂态相互作用机理分析和稳定性控制
本文从直流电压控制的角度,研究了多并联双馈感应发电机(DFIG)型风力发电机组在不对称电网故障时的暂态相互作用机理。首先,考虑正负序(PNS)分量的耦合特性以及转子侧变换器(RSC)与电网侧变换器(GSC)之间的相互作用特性,建立了直流电压控制时间尺度下基于dfig的多并联WTs的大信号非线性模型;在此基础上,利用能量函数法分析了基于dfig的多并联WTs的动态相互作用机理。利用相位轨迹图分析了不同参数对直流链路电压暂态特性的影响。得到了影响WTs暂态稳定性和直流电压稳定水平的主要因素。在此基础上,考虑到小波点之间的相互作用、小波点与小波点之间的动态相互作用以及电网规范的要求,提出了电网不对称故障时暂态稳定优化策略,以提高直流电压暂态稳定水平和多并联dfig小波点的暂态稳定性。最后,仿真和实验结果验证了理论分析的正确性和所提策略的有效性。
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来源期刊
IEEE Transactions on Sustainable Energy
IEEE Transactions on Sustainable Energy ENERGY & FUELS-ENGINEERING, ELECTRICAL & ELECTRONIC
CiteScore
21.40
自引率
5.70%
发文量
215
审稿时长
5 months
期刊介绍: The IEEE Transactions on Sustainable Energy serves as a pivotal platform for sharing groundbreaking research findings on sustainable energy systems, with a focus on their seamless integration into power transmission and/or distribution grids. The journal showcases original research spanning the design, implementation, grid-integration, and control of sustainable energy technologies and systems. Additionally, the Transactions warmly welcomes manuscripts addressing the design, implementation, and evaluation of power systems influenced by sustainable energy systems and devices.
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