Research on dynamic operation characteristics of a doubly-fed induction machine with a flywheel energy storage system

This paper proposes a double-fed induction machine with a flywheel energy storage system called the multifunctional flexible power conditioner (FPC). It consists of the doubly-fed induction machine (DFIM) with very large rotating inertia and a voltage-source pulse width modulation(PWM) rectifier-inverter used as an AC exciter. A FPC 10 kW model machine is developed. A simulation model for the model machine is built up and is simulated in some operating states, including phase modulation, subsynchronous, super-synchronous and so on. The model machine also is experiment in these proposed operating states. These results of simulation and experiment show that FPC is an effective way to compensate the unbalanced power and enhance the system stability. Satisfactory performance in decoupled control for the active and the reactive power and dynamic operation are obtained.