BIPOLAR BIDIRECTIONAL DIRECT CURRENT CONVERTER, AND CONTROL METHOD AND CONTROL DEVICE THEREFOR

摘要

A bipolar bidirectional DC converter, and a control method and a control device therefor. The bipolar bidirectional DC converter comprises at least two valve group series (101, 102) and at least six magnetic elements (103), and said valve group series are divided into a Type-I valve group series (102) and a Type-II valve group series (101) according to the connection relationship between the valve group series (101, 102) and a low-voltage side port of the bidirectional DC converter; a positive electrode of a low-voltage DC port of the Type-I valve group series (102) forms a positive electrode of the low-voltage side port of the bipolar bidirectional DC converter; a positive electrode of a low-voltage DC port of the Type-II valve group series (101) is connected to a negative electrode of the low-voltage DC port of the Type- I valve group series (102) and forms a neutral point of the low-voltage side port of the bipolar bidirectional DC converter, and a negative electrode of the low-voltage DC port of the Type-II valve group series (101) forms a negative electrode of the low-voltage side port of the bipolar bidirectional DC converter; each valve group series (101, 102) comprises a high-voltage DC port, a low-voltage DC port and at least three AC ports, and each AC port is connected to a magnetic element (103); and the other ends of the magnetic elements (103), which are connected to all the AC ports in the same valve group series (101, 102), are connected.