一個包含分散式發電的微電網通常都會與大電網作連接並提供電源給負載,而大電網和微電網之間的公共耦合點必須符合相關標準。當故障發生時,微電網與大電網斷開後,此時微電網變成一個電壓不平衡和失真的系統。當故障排除後,微電網與大電網進行同步併聯。因此,本論文提出了一個考慮分散式發電三相電壓不平衡和諧波電壓的同步控制器。本文所提出的方法,是以不改變傳統的鎖相迴路(PLL)之前提下,進行微電網與大電網的同步併聯。最後,在Xilinx System Generator 模擬環境中實現此同步控制器,並在OPAL-RT中進行硬體迴圈模擬,以證實本文所提方法的可靠性。
A microgrid including distributed generation sources (DGS) is generally connected to a bulk grid to provide power to its loads. The point of common coupling (PCC) between the bulk grid and microgrid should meet relevant standards. The microgrid becomes a weak system with unbalanced and distorted voltages after it is disconnected from the bulk grid. This thesis presents a synchronization controller for the DGS considering imbalanced three-phase voltages and harmonic voltages. The proposed method can be implemented without altering the traditional phase-locked loop (PLL) circuit. Simulation results reveal that the proposed method is applicable in a microgrid. Finally, the proposed synchronization controller is realized by using Xilinx System Generator and is tested in hardware in-the-loop by using OPAL-RT.