本論文旨在開發以風力開關式磁阻發電機為主之直流微電網,其直 流匯流排電壓由開關式磁阻發電機經由交錯式昇壓直流/直流轉換器建 立。藉由適當地之電力電路設計、換相移位設定、強健電壓電流控制及 適當電壓命令設定等,所建發電機於變動之驅動轉速及負載下具良好之 直流匯流排電壓調控特性。為從事微電網之實測性能評估,本文亦建構 一空間向量弦波脈寬調變之三相負載變頻器,做為測試負載。其於線性 及非線性負載下,均具良好之穩態交流電壓波形及動態電壓調節特性。 於所建之混合式儲能系統,超電容直並於開關式磁阻發電機之輸 出,在變動輸入能源與負載下,具改善之直流匯流排電壓調控特性。而 較長時間之能源支撐則由電池與飛輪儲能系統提供。電池組經由一雙向 昇降/昇降壓直流/直流介面轉換器介接至微電網之共通直流匯流排,而 開關式磁阻馬達驅動之飛輪則採用單臂雙向昇/降壓直流/直流介面轉換 器。經由適當地設計之控制器,可得良好之充、放電特性。此外,亦配 有傾卸式負載,以避免能源過剩造成直流匯流排過壓。 另外,本論文建構一插入式電能收集機構,於風能與儲能短缺時, 可取得之三相交流源可插入提供能源支撐。單相交流源與直流源也可輸 入所建之電能收集機構。
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.
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