DC-DC變換器并聯系統的均流技術

摘要：較小功率的DC-DC變換器模塊并聯與一個集中的大功率電源相比，有許多優點，例如：效率高，可運行于更高頻率，因而動態性能好，負載調整率好；并聯模塊可以實現冗余；輸出功率可以擴展，并易于維護等。分布電源系統中，無論前端變換器和負載變換器，標準模塊的并聯都已得到了廣泛應用。
對于DC-DC變換器模塊的并聯運行，附加均流控制目的是使負載電流在各模塊間平衡均勻分配。為了設計一個均流性能優越以及高可靠的DC-DC變換器并聯系統，人們已開發和分析了許多方法，如下垂法、主從均流法、自動均流法、民主均流法等。 敘詞：DC-DC變換器 并聯運行模塊 均流 下垂法 主從法 自動均流法 民主均流法 均流母線 Abstract：The paralleling of lower-power DC-DC converter modules offers a number of advantages over a single,high power,centralized power supply.The advantages include higher efficiency,better dynamic response due to a higher frequency of operation,and better load regulation.Paralleling allows for redundancy implementation,expandability of output power and ease of maintenance.Paralleling of standardized DC-DC converter modules is the approach widely used in distributed power systems for both front-end and load converters.In the case of parallel converter modules the additional current sharing control objective is aimed to keep the load current balance distribution between the modules.In order to construct a paralleling converter system with good performance of equality current distribution and high reliability,a variety of special load current sharing approaches were proposed,developed and analyzed in the past,such as droop,master-slaves,automatic and democratic approaches. Keyword：DC-DC converter parallel operation current sharing droop method master-slaves automatic approach democratic approach share bus