配電系統供應三相不平衡線性負載、非線性負載、太陽能發電系統及燈力並供變壓器或單相變壓器時，這些非三相平衡的設備使用，會引起過高之三相不平衡電流及中性線電流。本論文研究使用Matlab/Simulink建立三相四線式多重接地配電系統，分析四種三相三線式虛功率補償法與一種三相四線式虛功率補償法，用以改善電流不平衡問題。由加入非線性負載及太陽能發電系統產生之等效諧波電流，探討中性線電流改變情況。根據模擬結果得知，三相三線式不平衡負載及燈力並供變壓器所造成之三相電流不平衡，經過補償後可有效降低電流不平衡程度及中性線電流。同時藉由濾波器濾除諧波電流後，能有效減低饋線的電流總諧波失真程度，提高電力品質。

When the distribution system supplies three-phase unbalanced linear loads, non-linear loads, photovoltaic systems and open wye-open delta transformers or single-phase transformers, these non-three-phase balanced devices will cause high current imbalance and neutral current. This thesis is used to analyze four types of three-phase three-wire reactive power compensation methods and a three-phase four-wire reactive power compensation method to improve the current imbalance problem. It is based on a three-phase four-wire multi-grounded distribution system which is established by the Matlab/Simulink. It also studies the neutral current caused by harmonic current sources from non-linear loads and equivalent photovoltaic systems. According to the simulation results, the compensation methods can mitigate problems of high current imbalance and neutral current which is caused by three-phase three-wire unbalanced loads and open wye-open delta transformers. At the same time, after filtering the harmonic current by the filter, the total harmonic distortion of current can be effectively reduced, and the power quality can be improved.

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