本文旨在完成單相換流器並聯運轉之控制策略設計，以多個獨立控制之單相換流器，配合人機介面來實現本文系統。單相換流器採用全橋式電路架構，且使用電壓-頻率閉迴路與功率閉迴路控制策略，以維持系統輸出電壓與電流之穩定。人機介面方面採用圖控軟體LabVIEW作為模組換流器間通訊及系統監測。在單一模組故障發生時，能偵測故障模組並切離系統，且快速重新分配各模組運轉模式及功率設定值。另外，本文藉由控制器區域網路(CAN)，作為各組換流器與人機介面的通訊，從而達到提高系統總輸出容量及供電可靠度之目的。本系統採用德州儀器生產之數位信號處理(TMS320F28069)，作為單相換流器之控制核心。並聯運轉的控制方法採用主從式控制法，將分配一組換流器作為主模組執行電壓-頻率閉迴路控制，其餘兩組作為從模組執行功率閉迴路控制。功率分配方面採用主動均流模式，以完成各模組平均輸出功率之功能。
實測結果顯示三組模組正常運轉並操作於負載功率1kW之情況時，系統換流器輸出電壓有效值平均為111.10V，輸出電流有效值平均為3.15A，其平均之總諧波失真率分別為2.50%及4.74%，總系統運轉效率為0.951。當系統出現模組故障時，則由未故障之兩組換流器操作於負載功率1kW之情況時，未故障之換流器輸出電壓有效值平均為110.66V，輸出電流有效值平均為4.52A，其平均之總諧波失真率分別為2.39%及2.90%，總系統運轉效率為0.954。在故障轉換的部分，可在最高1kW負載條件下進行運轉模式變換與故障模組切離，且在轉換過程中仍保持系統輸出不中斷。由本文模擬與實驗結果驗證本文系統與控制策略所具備之可行性。

This thesis aims to design the control strategy for parallel single-phase inverters. The proposed system is composed of several independent inverters and human machine interface(HMI). The single-phase full-bridge inverters and voltage and current closed-loop control is used to stabilize output voltage and current. The graphical control software, LabVIEW, is adopted to implement the communication between modules and system monitoring. Once a module breaks down, the faulty module can be detected and cut off. The operating mode and power setting would be quickly redistributed to each module. Besides, to improve the total output capacity and power supply reliability, the controller area network(CAN) is adopted as the communication media between each inverter and HMI. The digital signal processor, TMS320F28069, is adopted as control kernel of single-phase inverter. Master-slave control is introduced to implement the parallel operation control. One of modules would be the master module under voltage closed-loop control, the others would be slave modules under current closed-loop control. In power distribution, the active current sharing mode is adopted to make output power of each module in average.
The experimental results show when the three modules are operated at load of 1kW, the average output voltage RMS value and its total harmonic distortion(THD) is 111.10V and 2.50%, respectively. The corresponding current values are 3.15A and 4.74%. The system efficiency is 0.951. When a module breaks down, the other two inverters are operated at load of 1kW, the average output voltage RMS value and its THD is 110.66V and 2.39%, respectively. The corresponding current values are 4.52A and 2.90%. The system efficiency is 0.954. In post-fault control with uninterruptible system output, the operation mode transformation and the cut-off of faulty module are implemented under the load condition of up to 1 kW. The feasibility of the proposed system and control strategy is verified by simulation and experimental results.

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