本論文著重研發於三相失真不平衡電網下併網型反流器的控制，改善失真不 平衡電網所造成的三相反流器輸出電流失真以及輸出功率漣波振盪。考慮失真不 平衡電網情況，所提漣波補償方法結合擴充功率及計算濾波電感與電容補償漣波 量，並重新推得一種基於靜止框下不平衡電網條件之直接功率控制策略，利用分 解電網端電壓與反流端電壓的耦合項將原有三相不平衡非線性時變系統轉換至 線性非時變系統，使控制器得以簡化。接著針對失真電網做諧波補償，此一方法 結合諧波解耦控制策略以提取電壓的基本頻率分量。最終透過所提方法經由模擬 結果進行分析，與實作建置一台 1.5kW 三相六開關反流器以驗證所提方法的有 效和正確性。;This paper focuses on the development of grid-tied inverters under distorted and unbalanced three-phase grids, aiming to improve the output current distortion and power ripple caused by such grid conditions. Considering the situation of distorted and unbalanced grids, the proposed ripple compensation method combines extension p-q theory and calculating filter inductance and capacitance powers to compensate for ripple. Furthermore, a direct power control strategy based on the stationary reference frame is derived under unbalanced grid conditions. This strategy decouples the terms between grid-side voltage and converter-side voltage and transfers the original three phase unbalanced nonlinear time-varying system into a linear time-invariant system, thereby simplifying the controller. Subsequently, harmonic compensation is addressed for distorted grids. The proposed method combines harmonic decoupling control strategies to extract the fundamental frequency component of the unbalanced grid voltage. Finally, through simulation results and the implementation of a 1.5 kW three phase six-switch inverter, the proposed methods are analyzed and verified for effectiveness and correctness.
