本論文之目的在於研製市電併聯型單相太陽能換流器及探討比例-積分控制器補償對系統穩定度和諧波抑制的情形。相較於比例型控制器,比例-積分型控制器對總諧波失真(THD)確實有良好的雜訊抑制效果。本研究的實驗方式係直接以DC source模擬升壓轉換器後端的DC bus,再以一參考訊號模擬太陽能板經過最大功率追蹤取得的數值來調節輸出至市電的電流。本文針對電流控制系統與補償器提出完整的分析與討論,並實際製作一部1.5kW的太陽能換流器。在此控制架構中,本文並以系統分析結果應用在硬體實務以驗證分析結果及其動態特性。最後,針對系統性能估測,分別對比例型與比例-積分型補償器所產生的諧波及電流總諧波失真做比較及分析。
The purpose of this thesis is to design and realize a gird-tied single-phase PV inverter and investigate a proportional-plus-integral (PI) compensator for system stability and harmonic elimination. In comparison with P controller, the PI controller can provide good ability for harmonic elimination to achieve lower total harmonic distortion (THD). In this work, a DC source like a DC bus from the boost converter and a reference signal from simulation solar panels after maximum power point tracking (MPPT) are used to regulate the output current to grid-tied utility. The system control including PI compensator is analyzed completely and its efforts are applied in the hardware implementation of a 1.5kW PV inverter to verify the estimated analysis and dynamic response. Finally, the harmonics and current THDs produced due to P and PI compensators are compared and analyzed with each other to investigate their performance on system.