單相分散式電力系統使再生能源得以分佈於一般家庭場所，並將所生電力傳輸至公共電網，而其架構通常含直流(Direct Current, DC)電網與交流(Alternating Current, AC)電網，並有雙向DC/AC轉換器在兩電網之間擔任轉換與流通電力之介面。為在降低AC電網諧波電流的同時，也簡化該DC/AC轉換器對AC電網之併網控制(Grid-Tie Control, GTC)，本研究提出一種電壓導向的四象限GTC方法，以用於單相DC/AC電壓型轉換器，使之能適用於單位功率因數整流器、逆變器、或靜態型虛功補償器等模式，而從系統角度提高電力傳輸品質與效率。另則從元件角度，亦可藉由零電壓切換-箝位電壓型(Zero Voltage Switching-Clamped Voltage, ZVS-CV)之柔切設計，消減DC/AC切換式轉換器的切換損失以提升效率，並因此能用高切換速度的金屬氧化物半導體場效電晶體 (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET）開關以提高轉換器的切換頻率，而使得散熱器及切換頻率濾波器的體積皆可縮小，則更適用家庭場所的單相系統。欲確保ZVS-CV運作，DC/AC轉換器的儲能電感必須流動高漣波電流，則將增加MOSFET的導通損失，因而該漣波電流應是在恰能確保ZVS-CV運作即可，為此，本研究提出了優化漣波電流的策略以使DC/AC轉換器獲得最佳效率。最後，本研究以一個單周控制的全橋式電壓型轉換器，以2 A電流對110 V AC電網進行模擬與實作，以驗證所提GTC方法，並評估它的效能。然後，在220 V AC獨立型逆變器輸出約1 kW的條件下進行模擬，以比較有無導入所提優化策略的轉換器效率差異，而驗證該策略的效益。

Single-phase distributed power generation system enables renewable energies to be distributed over residential sites and transfers the generated electricity to utility grid, wherein it is usually with direct-current (DC) and alternating-current (AC) grids interfaced by a DC/AC converter which converts and flows the electricity between the grids. To reduce harmonic current and simplify the grid-tie control (GTC), this study proposes a voltage-oriented control scheme for four-quadrant grid-tie of a single-phase DC/AC voltage-sourced converter (VSC) to operate smartly at modes of unity power factor rectifier, inverter, or static VAR compensator. The proposed GTC, in system view, reduces harmonic current and enhances the quality and efficiency for power transfer. Nonetheless, in component view, Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) can be utilized to raise switching frequency while Zero Voltage Switching-Clamped Voltage (ZVS-CV) technique eliminates switching loss. Then, heat sink and filter can both be shrunk so that compact VSC can fit the single-phase system in residential site. In order to ensure the ZVS-CV operation, the energy-storing choke of VSC must flow high ripple current that trades off conduction loss of MOSFETs, it motivates this study to propose strategies to optimize the ripple current and efficiency. Simulations and experiments are conducted with a One-Cycle controlled full-bridge VSC to verify the proposed GTC and evaluate its performance for 110 V AC grid under 2 A. Simulations are conducted to compare efficiencies of the 220 V AC inverters about 1 kW load with and without the proposed optimization strategies.

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