以模組化技術實現具隔離功能之高壓大功率交流——直流轉換器之研究

Design and Implementation of an Isolated High-Power High-Voltage Ac/Dc Converter with Modular Technology

本文提出了一種能直接高壓受電且具隔離功能之高壓大功率交流－直流轉換器可行架構，完成的系統可做為電動車充電站之充電機或直流電源使用，並且以模組化技術實現。所發展的系統除有高頻變壓器隔離外，相較於同規格傳統變壓器實踐之系統，能大幅減小尺寸和重量，且此技術的建立將有助於增進未來智慧型電網供電的能力與效率。為了能符合高壓大功率要求，本研究以多組串級做為輸入側交流－直流轉換器之前級架構，增加串級數能承受更高的輸入電壓；後級則為具高頻隔離且輸出並聯之直流－直流轉換器。前級轉換器電流控制策略採用修正式單週期控制方法實現，以降低輸入電流追蹤控制的複雜度；後級輸出側是並聯輸出，故需能實現均流控制。本文最後以兩模組串級，每模組前級輸入AC110V，輸出200V：後級每模組為200V直流輸入經高頻隔離到直流輸出48V，每模組400W的全類比控制設計來驗證所提控制方式確實可行。

This paper is on the development of a high-voltage high-power isolated AC-DC converter, which can be used as the charger or DC power supply of an electric vehicle charging station, and is based on modular technology. The proposed architectural structure is similar to the design of high-voltage solid-state transformers, and it can significantly reduce the size and weight of the charging station framework as well as enhance the ability to meet the future smart grid performance requirements. This paper adopts the cascade structure for the proposed input stage, followed by independent high-frequency transformer based DC-DC converters. As the cascade input has the same input current, the voltage and power balance control needs to be considered, particularly in the case of the rear stage output variations. Since the output side is parallel, the appropriate current sharing control must also be considered. Finally, a prototype of the two modules cascaded system is achieved to verify the control idea. Each module is about 400W and consists of a single phase rectifier sourced by AC 110V input and DC 200V output, and a second stage of 200V / 48V with high-frequency transformer.