本論文提出一種改良型大功率三相逆變器直流鏈電容器的減額定評估電路，並對傳統減額定評估電路的概念進行討論。所提改良型減額定逆變器評估電路在負載平衡與負載不平衡時皆能得到與全額定三相逆變器直流鏈電容相同的電流與電壓，並且本論文將被動元件在線監測功能加入減額定評估電路中，使其在進行電容老化測試時能即時得知電容容值。進一步本文提出了新型無電流感測三相整流器之系統控制，將電感感值估測功能加入無電流感測器三相功率因數校正整流器系統中，改善了傳統無電流感測器三相功率因數校正整流器須已知輸入電感感值的需求，使其在輸入電感因為老化或其他因素發生感值變化時亦能有良好的表現，並且加入電容容值估測功能用以監控電容容值的老化現象。 最後，本文以德州儀器生產之數位信號處理器TMS320F28335與賽靈思生產之現場可程式化邏輯閘陣列Cmod A7 35T進行實作，經由模擬與電路實作驗證本論文之改良型減額定逆變器評估電路、三相轉換器之被動元件在線監測功能與新型無電流感測三相整流器之系統控制的有效性。 ;In this thesis, an improved down-scale evaluation system for capacitors utilized in high-power three-phase inverters is proposed. Some concepts of the conventional down-scale evaluation systems are discussed. The proposed improved down-scale evaluation system can derive the same DC-link capacitor current and voltage in the full-scale inverter under both balanced and unbalanced load condition. In addition, the online condition monitoring method of passive components is added to the proposed improved down-scale evaluation system, so that the capacitance value of the DC-link capacitor can be immediately known during the capacitor aging test. Furthermore, a new current sensorless control for three-phase power factor correction(PFC) rectifier system is proposed in this thesis. The inductance estimated method is added to the current sensorless three-phase PFC rectifier system, It can improve the conventional current sensorless three-phase PFC rectifier system without the demand of input inductance value. Then the system can be well controlled even if the input inductance value is changed due to aging or other factors. In addition, the capacitance estimated method is added to monitor the aging phenomenon of capacitance value. Finally, the digital signal processor(DSP) TMS320F28335 and field programmable gate array(FPGA) Cmod A7 35T is utilized in the implementation. The simulation and experimental results can verify the feasibility of the proposed down-scale evaluation system, online condition monitoring method of passive components in the three-phase converters, and novel current sensorless three-phase PFC rectifier system.
