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1. (WO2018036223) DC-DC CONVERSION SYSTEM AND CONTROL METHOD THEREFOR

Pub. No.:    WO/2018/036223    International Application No.:    PCT/CN2017/085264
Publication Date: Fri Mar 02 00:59:59 CET 2018 International Filing Date: Tue May 23 01:59:59 CEST 2017
IPC: H02M 3/155
Applicants: GLOBAL ENERGY INTERCONNECTION RESEARCH INSTITUTE CO., LTD.
全球能源互联网研究院有限公司
STATE GRID CORPORATION OF CHINA
国家电网公司
Inventors: TANG, Guangfu
汤广福
HE, Zhiyuan
贺之渊
WANG, Xinying
王新颖
WEI, Xiaoguang
魏晓光
PANG, Hui
庞辉
ZHANG, Sheng
张升
WANG, Chenghao
王成昊
GAO, Yang
高阳
KE, Jinkun
客金坤
YANG, Bingjian
杨兵建
ZHOU, Wandi
周万迪
ZHANG, Ning
张宁
LIU, Yuan
刘远
DING, Xiao
丁骁
Title: DC-DC CONVERSION SYSTEM AND CONTROL METHOD THEREFOR
Abstract:
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.