A permanent magnet synchronous generator control approach for stand alone gas engine generation system
This paper addresses a control strategy for permanent magnet synchronous generator (PMSG) interconnected to the load through a back to back converter for stand alone gas engine generation system. The engine generator system with a diode rectifier causes harmonic currents in the generator which can affect generator efficiency and produce torque oscillations. Using an insulated gate bipolar transistor (IGBT) rectifier instead of the diode rectifier enables us to improve current waveforms and to control output voltage of PMSG. In the proposed control scheme, the generator side converter is controlled by means of a vector control method which is based on the mathematical model of PMSG and rectifier in the stator oriented dq reference frame. Using this control strategy, we obtain a controllable dc link voltage and can control generator stator voltage to its rated value. For load side inverter control, the concept of virtual synchronous generator (VSG) control is adopted to support smooth transients between islanding and grid connected operation. Simulation is carried out to analyze system responses under loading and unloading conditions. The simulation results show usefulness of the proposed control structure.
2016 IEEE 8th International Power Electronics and Motion Control Conference (IPEMC ECCE Asia)