Continuous operation control during electric power network faults in an adjustable speed generation system with a flywheel excited by a DC link converter

For an adjustable speed generation system with a flywheel, not only quick active power and voltage responses, but also continuous operation during electric power network faults are necessary to stabilize electric power networks. Quick active power response of 40 rad/s and voltage response of 40 rad/s are obtained in a 30 kVA test model. To realize these quick responses, a controller with multi-microprocessors is used, in which the minimum sampling time is 185 μs. Moreover, cooperative power flow control between the rectifier and inverter is added to power, voltage and speed controls of the generator/motor. Chopper control for overvoltage suppression is added to the DC link voltage control. Continuous operation can be realized even during such electric power network faults as 1-line, 2-line and 3-line ground faults due to these controls