- 學位論文
以開關式磁阻發電機為主具隔離型轉換器與插入式充電器直流微電網之開發
DEVELOPMENT OF A SWITCHED-RELUCTANCE GENERATOR BASED DC MICRO-GRID WITH ISOLATED CONVERTERS AND PLUG-IN CHARGER
摘要
本論文旨在開發以風力驅動開關式磁阻發電機為再生發電源之實驗 型直流微電網。首先適當地設計開關式磁阻發電機之電力電路及控制迴路，以降低換相及開關切換所造成之直流鏈電壓紋波，並應用一簡易強健電壓控制器以在發電機轉速變動下仍可獲得良好之電壓調控特性。接著開發一動態換相位移控制器，進一步強化操控性能。 建立了具良好調控輸出電壓之開關式磁阻發電機後，其直流輸出 (48V)經一具電氣隔離之電流注入推挽式直流-直流轉換器升壓以建立一共同直流匯流排(400V)。其中，轉換器之電力電路及控制機構亦妥適設計以獲得調節良好之直流匯流排電壓。此外，亦建立一個三相三線式變頻器做為所建構直流微電網之測試負載，並應用簡易強健電壓控制獲得追控良好之輸出交流電壓波形。 為提供變動再生發電源之輔助能源，本論文建構一鉛酸蓄電池儲能 系統，蓄電池經由所建之具隔離雙向電流注入推挽式/全橋式直流-直流轉換器介接至共同匯流排，經實驗評估其具良好之放電及充電控制性能。 此外，提出一以電流注入推挽切換式整流器為主之輔助充電器，以便於開關式磁阻發電機故障時能由傳統電網對蓄電池進行輔助充電。所建構之電流注入推挽切換式整流器採用開關磁阻發電機後接介面轉換器之內置元件，僅需外接一橋式二極體整流器。透過適當之設計與控制，亦獲得良好之充電特性與入電品質。
並列摘要
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.