A novel control strategy for enhancing the LVRT and voltage support capabilities of DFIG

International Conference on Energy Engineering and Environmental Protection 2017

能源学;生态环境科学

Shen, Yangwu^1 ; Zhang, Bin^1 ; Liang, Liqing^1 ; Cui, Ting^1

State Grid Hunan Electric Power Corporation Research Institute, Changsha, Hunan

410007, China^1

关键词: Double fed induction generator;    Energy storage systems;    Grid-side converter;    Integrated control strategy;    Low-voltage ride-through;    Reactive power support;    Rotor-side converter;    Transient operation;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/121/4/042035/pdf
DOI  :  10.1088/1755-1315/121/4/042035

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

A novel integrated control strategy is proposed in this paper to enhance the low voltage ride through capacity for the double-fed induction generator by equipping an energy storage system. The energy storage system is installed into the DC-link capacitor of the DFIG and used to control the DC-link voltage during normal or transient operations. The energy storage device will absorb or compensate the power difference between the captured wind power and the power injected to the grid during the normal and transient period, and the grid side converter can be free from maintaining the voltage stability of the DC-link capacitor. Thus, the grid-side converter is changed to reactive power support while the rotor-side converter is used to control the maximum power production during normal operation. The grid-side converter and rotor-side converter will act as reactive power sources to further enhance the voltage support capability of double-fed induction generator during the transient period. Numerical Simulation are performed to validate the effectiveness of the proposed control designs.