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|1. (WO2018036223) DC-DC CONVERSION SYSTEM AND CONTROL METHOD THEREFOR|
|Applicants:||GLOBAL ENERGY INTERCONNECTION RESEARCH INSTITUTE CO., LTD.
STATE GRID CORPORATION OF CHINA
|Title:||DC-DC CONVERSION SYSTEM AND CONTROL METHOD THEREFOR|
A DC-DC conversion system and a control method therefor, the system comprising: a phase unit (401) and a controller (407); the phase unit (401) includes a plurality of bridge arms, and the plurality of bridge arms are in a star connection to form a common terminal (411) and a plurality of output terminals (408, 409, 410); each bridge arm includes a variable voltage source (402, 403, 404), and the controller (407) is connected to each of the variable voltage sources (402, 403, 404) for controlling the voltages of the respective variable voltage sources (402, 403, 404). Compared with the prior art, in the DC-DC conversion system and the control method therefor, the respective bridge arms in the phase unit (401) thereof are in a star connection, so that the commutation for energy balance only circulates inside the system, and does not flow into a DC system; meanwhile, the system uses fewer power electronic devices and filters, and can be applied in the field of high-voltage large-capacity DC power transmission, thus reducing the limit imposed by inductive components on DC power transmission in a DC-DC conversion system.