近年來，由於再生能源的特性造就分散式電源的發展，大部分的分散式電源透過變流器併上交流電網來供給用戶端之負載使用。在併聯市電模式下，容易受非線性負載或是含諧波之負載而影響轉換器輸出，導致饋入至電網端之電流品質下降。本研究採用多迴路控制策略搭配諧波補償機制，來實現電流饋入式單相變流器併聯市電，期改善暫態響應特性及降低輸出電流之總諧波失真，維持良好的供電品質；本研究採用LCL濾波器實現多迴路控制策略，增加可回授控制變數，並且對單迴路及多迴路控制進行小訊號分析。經由模擬及實測驗證本文所提及單相併聯市電變流器，透過負載變動比較單迴路及多迴路之暫態響應時間的快慢；另一方面，加入諧波補償器驗證此控制能有效改善供電品質。

In recent years, renewable energy resources have been promoting the wide development of distributed generation. Most of distributed generation supplies energy to the residential load by means of inverters tied with AC grid. The output of the converter is easily affected by non-linear loads that produces harmonics in the same power system. The output quality of the current fed inverter can be even worse the grid-tied mode. This study focuses on the multi-loop control strategies with harmonic compensation technique that is applied to the single-phase current-fed inverter. The main object is to improve the characteristic of transient response and reduce the total harmonic distortion of the output current at the point of common coupling. This study adopts the LCL filter at the port of inverter output to realize the multi-loop control strategies. Analyses of small signals for the single loop and multi-loop are conducted and the associated performance of the single-phase grid-tied inverter is validated by the simulation results and experimental results. Furthermore, test of the harmonic compensator has shown its function for improving the power quality.

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