Abstract
This thesis presents the development of an experimental common DC-bus micro-grid system with a wind-driven switched-reluctance generator (SRG) as distributed generation source. In the establishment of SRG system, its power circuit and control scheme are first properly designed considering the alleviation of DC-link voltage ripples effects caused by commutation and switching. Moreover, the simple robust control is applied to yield improved DC output voltage regulation characteristics under varying prime mover driving speed. Then the operating performance is further enhanced via commutation shift approach. Having established the well-regulated SRG system, its output voltage (48VDC) is boosted by an isolated current-fed push-pull (CFPP) interface DC/DC to establish the common DC bus (400VDC). Similarly, the well-regulated DC bus voltage is achieved by the properly designed schematic and control scheme. As to the test load of micro-grid, a three-phase three-wire load inverter is established. Good AC output waveforms and regulation performance are obtained by applying the developed simple robust control approach. To provide the energy support for the micro-grid under generating fluctuation, a lead-acid battery energy storage system with bidirectional CFPP isolated interface DC/DC converter is developed. Good charging and discharging control performances are evaluated experimentally. In addition, a CFPP based switch-mode rectifier (SMR) is established and employed as an auxiliary charger. It can let the battery be charged from utility grid as the SRG fault is occurred. This SMR is formed using the embedded components of the SRG interfaced boost CFPP DC/DC converter, only an external diode bridge is needed. Through the proposed proper control, good charging characteristics and line drawn power quality are achieved.