双馈风电机组的虚拟同步控制及弱网运行特性分析

王磊; 张琛; 李征; 蔡旭

引用本文:	王磊,张琛,李征,等.双馈风电机组的虚拟同步控制及弱网运行特性分析[J].电力系统保护与控制,2017,45(13):85-90.
	WANG Lei,ZHANG Chen,LI Zheng,et al.Virtual synchronous generator control for DFIG wind turbines and its operation characteristics in weak grid[J].Power System Protection and Control,2017,45(13):85-90

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双馈风电机组的虚拟同步控制及弱网运行特性分析
王磊¹,张琛¹,李征²,蔡旭¹
(1.电子信息与电气工程学院风力发电研究中心，上海交通大学，上海200240; 2.东华大学信息科学与技术学院，上海 201620)

摘要:

采用传统矢量控制的风电机组对外表现为电流源特性，大型风电机组在接入配电网环境时容易引发电压失稳、缺乏惯量等问题。为此，研究了基于虚拟同步风电机技术的双馈风电机组控制方法。在详细分析影响并网点电压因素的基础上，研究电网等效阻抗对静态电压稳定性的影响。给出一种虚拟同步控制下双馈风电机组并网频率、电压的调节方案。研究结果表明，相对矢量控制方法，虚拟同步控制的双馈风电机组在弱电网下具有良好的电压稳定性。此外，该控制方法在降低机端电压冲击以及提供电网频率支撑等方面具有明显优势。仿真结果验证了所给虚拟同步控制策略的可行性和有效性。

关键词: 弱电网风力发电双馈风电机组电流源型控制虚拟同步发电机

DOI：10.7667/PSPC160783

分类号:

基金项目:上海市自然科学基金项目(14ZR1400700)

Virtual synchronous generator control for DFIG wind turbines and its operation characteristics in weak grid

WANG Lei¹,ZHANG Chen¹,LI Zheng²,CAI Xu¹

(1. Wind Power Research Center, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. School of Information Science and Technology, Donghua University, Shanghai 201620, China)

Abstract:

Vector control makes the wind turbine equivalent to a current source and large-scale wind turbines connected to distributed network decrease voltage stability of grid and lack required inertia. To solve these issues, virtual synchronous generator control strategy for DFIG wind turbines is studied. By means of detailed analysis on the voltage of the point of common coupling (PCC), the impact of the grid impedance on static voltage stability is investigated. A virtual synchronous generator control strategy for DFIG wind turbines regulating frequency and voltage is presented. Studies show that the wind turbine using the virtual synchronous generator control strategy has better voltage instability than that using the current-source control strategy. Furthermore, this control strategy has obvious advantages in the aspects of reducing the surge of generator terminal voltage and providing frequency support for grid. Simulated results verify the feasibility and efficiency of the virtual synchronous generator control strategy. This work is supported by Natural Science Foundation of Shanghai (No. 14ZR1400700).

Key words: weak grid wind power DFIG wind turbines current source control virtual synchronous generator

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