Abstract
A switched-reluctance generator (SRG) based DC micro-grid is developed in this thesis. Its DC bus voltage is established by the SRG through an interleaved boost DC/DC converter. The well-regulated DC bus voltage under varying shaft driving speed and load condition is achieved by properly handling the related key issues, such as power circuit design, commutation instant setting and shifting, robust current and voltage control, and voltage command setting. A three-phase load inverter with space vector PWM scheme is established and used as the test load. Good steady-state AC voltage waveform and dynamic response are preserved under linear and nonlinear loads. In the developed hybrid energy storage system, a super-capacitor bank is directly connected across the SRG output to yield the improved DC bus voltage regulation characteristic against the fluctuations of source and load. As to the long-period energy support, it is accomplished by the battery/flywheel storage system. The battery bank is interfaced to the common DC bus via a bidirectional buck/boost-buck/boost DC/DC converter. And the switched-reluctance motor (SRM) driven flywheel adopts the oneleg bidirectional buck/boost DC/DC converter as its interface. Good charging/discharging performances are obtained by the designed control schemes. Moreover, a chopped dump load is equipped for preventing the bus from over-voltage due to the occurrence of energy surplus. Additionally, an integrated plug-in switched mode rectifier (SMR) based energy harvesting system is developed in this thesis. The possible harvested three-phase AC source can be interfaced to the established micro-grid for providing the energy support as the energy deficiencies of wind source and storage devices occur. The input sources to the developed system can also be single-phase AC or DC sources.