Abstract
A prime mover emulator using permanent-magnet synchronous motor (PMSM) for driving distributed and renewable generator is developed in this thesis. In the developed emulator, the sinewave excited surface-mounted PMSM (SPMSM) drive is powered from the mains via a single-phase boost-type switch mode rectifier (SMR) front-end with good line drawn power quality and well-regulated DC-link voltage. The PMSM drive control scheme is arranged to drive the tested generator in conventional speed control mode or wind turbine torque-speed control mode. Both the SMR and SPMSM drive control schemes are properly designed to achieve faithful prime mover driving behavior. Good energy conversion efficiency and line-drawn power quality are obtained simultaneously. In SMR control scheme, it adopts hysteresis current-controlled PWM (H-CCPWM) switching to obtain robust current tracking control performance. Both fixed-band and sinusoidal varying-band are comparatively evaluated their current harmonic spectral spreading characteristics and operating performances. Next, for performing the prime mover loading test, an interior PMSG (IPMSG) followed by a three-phase Vienna SMR is established. It receives the mechanical driven power form prime mover and establishes a 400V DC-link for DC micro-grid. Similarly, good current and voltage control performances of the IPMSG are obtained by the designed control schemes. Furthermore, several wind turbine torque-speed characteristic curves under different wind speeds are emulated by the established prime mover. And maximum power point tracking (MPPT) function for the followed IPMSG with three-phase Vienna SMR is achieved by using perturb and observation (P&O) methodology. Finally, the whole prime mover emulator driven IPMSG system is assessed by some measured results.