引用本文: | 单碧涵,王宝华,刘洋,刘硕夫.基于定子侧模拟电阻的双馈风电场次同步振荡抑制策略研究[J].电力系统保护与控制,2020,48(5):10-16.[点击复制] |
SHAN Bihan, WANG Baohua, LIU Yang and LIU Shuofu.Analysis of a new control strategy based on stator-side virtual resistance to suppress sub-synchronous oscillation in DFIG-based wind farms[J].Power System Protection and Control,2020,48(5):10-16[点击复制] |
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摘要: |
双馈风电场并网运行时,容易发生次同步振荡事故。搭建了双馈风电场经串联补偿电容并网的系统模型,并用Nyquist稳定性判据分析了影响双馈风电场次同步振荡的主要因素。在此基础上,提出了一种基于定子侧模拟电阻的次同步振荡抑制策略,以增强次同步频带下的电气阻尼。时域仿真结果表明该方法能够有效抑制双馈风电场并网系统中的次同步振荡现象,提升系统的稳定性。相较于传统的抑制方法,所提方案无需任何附加装置,便于工程实际应用。 |
关键词: 双馈风电场 并网模型 次同步振荡 奈奎斯特稳定判据 定子模拟电阻 |
DOI:10.19783/j.cnki.pspc.190421 |
投稿时间:2019-03-31修订日期:2019-08-25 |
基金项目:国家自然科学基金项目资助(51707096);江苏省风力发电工程技术中心开放基金项目资助(ZK16-03-02) |
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Analysis of a new control strategy based on stator-side virtual resistance to suppress sub-synchronous oscillation in DFIG-based wind farms |
SHAN Bihan,WANG Baohua,LIU Yang,LIU Shuofu |
(School of Automation, Nanjing University of Science and Technology, Nanjing 210094, China;School of Automation, Nanjing University of Science and Technology, Nanjing 210094, China;Jiangsu Wind Power Engineering Technology Center, Nanjing 210023, China) |
Abstract: |
When connected to the grid, sub-synchronous oscillations may occur in the wind farms composed of Doubly-Fed Induction Generators (DFIG). This paper builds the system model of the DFIG-based wind farms that are connected to the grid via series compensation capacitors, and then analyses the main factors that affect the characteristics of the sub-synchronous oscillations with the Nyquist stability criterion. On this basis, a new control strategy based on stator-side virtual resistance is proposed to suppress the sub-synchronous oscillation by enhancing the electrical damping within the sub-synchronous frequency band. The simulation results in time domain show that this method can effectively suppress the occurrence of sub-synchronous oscillation and improve the stability of the system. Compared with the traditional suppressing method, the new strategy in this paper does not need any additional devices, thus it is favorable for engineering applications. This work is supported by National Natural Science Foundation of China (No. 51707096) and Open Fund Project of Jiangsu Wind Power Engineering Technology Center (No. ZK16-03-02). |
Key words: DFIG-based wind farm grid-connected model sub-synchronous oscillation Nyquist stability criterion stator-side virtual resistance |