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1.中国石油大学(华东)新能源学院,山东省青岛市 266580
2.联合汽车电子有限公司苏州研发中心,江苏省苏州市 215000
赵仁德(1976—),男,通信作者,博士,副教授,硕士生导师,主要研究方向:可再生能源发电、电气节能、电力设备在线监测等。E-mail:zhaorende@upc.edu.cn
袁诚(1995—),男,硕士研究生,主要研究方向:双馈风力发电、故障穿越。E-mail:yuan_c@foxmail.com
宣丛丛(1995—),男,硕士研究生,主要研究方向:双馈风力发电、电力变换。E-mail:xuan_congcong@163.com
收稿日期:2021-01-22,
修回日期:2021-05-25,
网络出版日期:2021-08-05,
纸质出版日期:2021-10-10
移动端阅览
赵仁德,袁诚,宣丛丛等.基于变结构准Z源的双馈风电机组强励变换器[J].电力系统自动化,2021,45(19):181-191.
ZHAO Rende,YUAN Cheng,XUAN Congcong,et al.Forced Excitation Converter for DFIG-based Wind Turbine Based on Variable-Structure Quasi-Z-source[J].Automation of Electric Power Systems,2021,45(19):181-191.
赵仁德,袁诚,宣丛丛等.基于变结构准Z源的双馈风电机组强励变换器[J].电力系统自动化,2021,45(19):181-191. DOI: 10.7500/AEPS20210122010.
ZHAO Rende,YUAN Cheng,XUAN Congcong,et al.Forced Excitation Converter for DFIG-based Wind Turbine Based on Variable-Structure Quasi-Z-source[J].Automation of Electric Power Systems,2021,45(19):181-191. DOI: 10.7500/AEPS20210122010.
当电网电压发生深度跌落时,需要风力发电系统不脱网且向电网提供动态无功支撑,采用传统励磁变换器的双馈风电机组往往需要通过外加装置才能实现这一要求。外加装置使系统变得复杂,可靠性和效率降低。针对这一问题,文中分析了双馈风电机组低电压穿越的瓶颈,提出了构建坚强励磁系统的思想,并设计了一种基于变结构准Z源的新型双馈风电机组强励变换器。将传统的电容型母线替换为准Z源网络,当电网正常时该变换器运行于可调电压的单电容型母线状态,当电网电压发生深度跌落时,该变换器可以迅速升高直流链电压,从而保证转子侧变换器在故障期间始终可控。搭建了双馈风电机组低电压穿越仿真与实验系统,仿真与实验结果表明所提强励变换器拓扑具有良好的稳态与动态性能,在电压深度跌落时能够有效控制转子电流,实现双馈风电机组的低电压穿越和无功支撑。
When a severe voltage sag occurs in the power grid
the wind power generation system should keep connected to the power grid and provide dynamic reactive power support to the power grid. The doubly-fed induction generator (DFIG) based wind turbines using the traditional excitation converter usually require additional devices to meet this requirement
which leads to complicated systems with low reliability and efficiency. Aiming at this problem
this paper analyzes the bottleneck of low voltage ride-through (LVRT) of DFIG-based wind turbines
and proposes the idea of building a forced excitation system. A new type of forced excitation converter based on variable structure quasi-Z-source is designed for DFIG-based wind turbines. The traditional capacitive bus is replaced by a quasi-Z source network. When the power grid is normal
the proposed converter operates in the state of single capacitive bus with adjustable voltage. When the power grid voltage drops deeply
the proposed converter can raise the DC-link voltage quickly
ensuring the rotor side converter (RSC) remain controllable during the fault. The simulation and experimental systems for LVRT of DFIG-based wind turbines are constructed. The simulation and experimental results indicate that the proposed forced excitation converter topology has good steady-state and dynamic performances
and it can effectively control the rotor current when the voltage drops deeply and realize the LVRT and reactive power support of DFIG-based wind turbines.
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