Improved Control Strategy for Doubly-fed wind Turbines in Weak Synchronous Support Systems

2019 4th Asia Conference on Power and Electrical Engineering

能源学;电工学

Wang, Weiyuan^1 ; Dou, Fei^1 ; Yang, Mengmeng^2 ; Huang, Qinxin^2 ; Gao, Yifan^2

State Grid Jiangsu Electric Power Co., Ltd., Jiangsu

210000, China^1

East China Electric Power Design Institute Co., Ltd., Shanghai

200001, China^2

关键词: Control strategies;    HVDC transmission system;    Improved controls;    Line-commutated converters;    Normal operations;    Simulation analysis;    Stator voltages;    Support systems;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/486/1/012050/pdf
DOI  :  10.1088/1757-899X/486/1/012050

来源: IOP

【 摘 要 】

When the wind power is sent as the interface by the line commutated converter, the vector-controlled doubly-fed wind turbine will be difficult to operate without power supply support, and it is impossible to send the wind power through the HVDC transmission system on a large scale. Future planned land-based wind power bases are becoming more remote and may not contain synchronous units. Therefore, it is extremely urgent to design a dual-feeder control strategy that can operate independently. In this paper, the control target of the doubly-fed turbine is changed to control the stator voltage and frequency. An improved control strategy of the doubly-fed turbine in the weak synchronous support system is proposed. The doubly-fed turbine will have the ability to send out through the line commutated converter. The simulation analysis of the wind power access weak synchronous support system sent by the HVDC transmission system is carried out. Under the natural wind disturbance, the sending end and the receiving end communication system disturbance, the doubly-fed turbine can quickly resume normal operation. With the effectiveness of this control strategy, the doubly-fed turbine can operate independently even if it loses its synchronous power supply.