Experimental investigation of network frequency controlled by wind power plants with doubly fed induction generators

This paper presents an experimental investigation of network frequency stability controlled by wind power plants with doubly fed induction generators without supporting from other conventional power plants in the laboratory scale. The combination of kinetic energy and pitch control methods implemented by many wind turbines in a wind farm and coordinated by a wind farm control center is proposed in this paper. This method combines all advantages and eliminates all drawbacks of both methods. The active pitch control can support long period frequency control, and the kinetic energy control can support fast action of frequency control. Therefore, the combination method provides fast action and long period support of network frequency controlled by wind power plants.