併網型直流匯流排系統之電壓控制

Abstract

本篇論文是利用一組全橋電路，實現具雙向功率潮流特性的直流匯流排系統。在控制方法上，不同於傳統多迴路電流感測控制必須偵測輸入電壓、輸出電壓以及電感電流，本論文提出一只感測輸入電壓及輸出電壓的控制，並利用演算方式控制輸入電流使其達到功因校正且在直流鏈亦可維持一穩定直流電壓，提供能量供應後級使用，若後級電路有併接發電設備如太陽能發電、風力發電、電池等，發電功率若大過於負載，能量回送至直流鏈，本控制器也能將其能量做功因校正並回送至前級並聯的市電端，在前級輸入電壓失真且後級發電設備與負載間功率平衡拉扯的情況下，都能夠維持輸出電壓保持為一穩定命令電壓，且輸入電流為弦波。

In this paper, full bridge circuit is used to develop the Bi-directional Grid –type DC Bus System. The sustainable energy such as solar energy, wind energy and the energy storage equipment such as battery are connected to the dc voltage. When the generated power is greater than the dc load, the DC Bus system must feedback the power to the grid. On the contrary, the DC Bus System must get power from grid when the generated power is not large enough to supply the dc load. Compared with the conventional multi-loop control sensing input voltage, output voltage and current the proposed control senses only input and output voltage. It regulates output voltage and yield sinusoidal current synchronized to input voltage.