基于超级电容器的DFIG低电压穿越研究
葛雨生1，张仰飞2，陈光宇2，徐睿2，纪思3
（1 江苏苏美达成套设备工程有限公司，江苏 南京 210018；
2 南京工程学院 电力工程学院，江苏 南京 211167；3 云南电网有限责任公司楚雄供电局，云南 楚雄 675000）
摘 要：为避免电网电压跌落时双馈异步风力发电机组脱网运行，分析了双馈异步风力发电系统双PWM变流器控制策略，提出了将超级电容器耦合于风电机组机侧变流器和网侧变流器之间的直流侧母线上的方法，从而借助超级电容器的功率快速吞吐能力实现网侧故障时机侧变流器与网侧变流器之间的功率平衡，有效地稳定了直流侧母线电压。基于MATLAB/SIMULINK仿真了双馈异步风力发电系统发生电压跌落故障，仿真结果表明超级电容器模块可以有效地减少故障期间的直流侧电压的干扰，能够在故障清除之后迅速且平稳地恢复有功功率。
关键词：超级电容器；双馈异步风力发电系统；低电压穿越；控制策略
中图分类号：TM53；TM614 文献标识码：A 文章编号：1007-3175(2019)10-0014-06
Research on DFIG Low Voltage Ride Through Based on Supercapacitor
GE Yu-sheng1, ZHANG Yang-fei2, CHEN Guang-yu2, XU Rui2, JI Si3
（1 Sumec Complete Equipment and Engineering Co., Ltd, Nanjing 210018, China;
2 School of Electric Power Engineering, Nanjing Institute of Technology, Nanjing 211167 , China;
3 Chuxiong Power Supply Bureau of Yunnan Power Grid Co., Ltd, Chuxiong 675000, China）
Abstract: In order to avoid the off-grid operation of doubly-fed asynchronous wind turbines when the grid voltage drops, this paper analyzed the control strategy of doubly-fed asynchronous wind turbines system and double PWM converter and proposed a method of coupling supercapacitor (SC) to the dc bus located between the wind turbine side converter and the grid-side converter, so as to establish the power balance between the turbine side converter and the grid side converter when the grid side network failed, with the help of the SC's power fast output handling capacity.The above strategy can effectively stabilize the bus voltage on the dc side. The voltage drop fault of DFIG system was simulated based on MATLAB/SIMULINK. The results show that the supercapacitor module can effectively reduce the disturbance of the dc side voltage during the fault period and can recover the active power quickly and smoothly after the fault is cleared.
Key words: supercapacitor; doubly-fed asynchronous power generation; low voltage ride through; control strategy
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