Constant voltage control method of DC bus in DG

Abstract

Randomness and volatility of distributed generator power have seriously affected its application in power system. To stabilize the DC bus voltage, as well as improve the reliability and quality of power supply of distributed power system, the flywheel energy storage system is connected to the distributed power system. By control of the charge and discharge of flywheel, voltage of the DC bus can remain stable. Besides, design of the control circuit of the flywheel energy storage system and flywheel motor discharge control algorithms and strategies are presented. Simulation of the distributed generation system configured with the flywheel energy storage system is established, validating that the export voltage of distributed power generation systems remains stable when DC load changes, instantaneous and permanent fault occurs on DC bus.