低短路比下双馈风力发电机组电压主动支撑的优化控制策略

作者：Feng Yantao; Xie Zhen^*; Li Mengjie; Zhang Xing; Yang Shuying

来源：High Voltage Engineering, 2023, 49(1): 42-53.

DOI：10.13336/j.1003-6520.hve.20220225

• doubly fed induction generator
• grid connection of wind turbines
• optimal control
• power limited
• short circuit ratio
• voltage active support

With the large-scale grid connection of wind turbines, the short circuit ratio of point of common coupling (PCC) is decreasing. As the positive power of wind turbines increasing, the voltage on the line impedance increases, and the voltage of PCC also decreases at the same time, which results in the limitation of the output power of wind turbines. In order to improve the output power limitation caused by voltage reduction under low short circuit ratio, a closed-loop optimal control strategy based on active voltage support was proposed for doubly fed induction generator. On the basis of supporting the voltage of PCC, the active power of the doubly-fed wind turbine under low short-circuit ratio is improved, and the system stability problem caused by power coupling in conventional voltage closed-loop control is solved. Under the optimal control strategy, the damping ratio of the dominant pole is larger, which improves the stability of the system. Finally, the step response stability of doubly fed induction generator under the optimized control strategy is verified on the 11 kW doubly fed induction generator experimental platform. ? 2023 Science Press.

• 单位
  合肥工业大学