Title:
MMC CONVERTER
Document Type and Number:
WIPO Patent Application WO/2018/124516
Kind Code:
A2
Abstract:
The present invention relates to a modular multilevel converter (MMC) and, more particularly, to a MMC converter comprising a preliminary sub-module which is provided between an upper converter arm of the MMC converter and a lower converter arm thereof, and which can be commonly used for the upper converter arm and the lower converter arm. An MMC converter according to the present invention comprises: upper and lower converter arms, each of which comprises a plurality of sub-modules connected in series to each other; and a preliminary sub-module connected between the upper and lower converter arms. The preliminary sub-module comprises: an energy storage portion for storing a DC voltage inside the sub-modules; a first semiconductor switch connected in parallel to the energy storage portion; a second semiconductor switch connected in series to the first semiconductor switch; a third semiconductor switch connected in series to the second semiconductor switch; and a switching control portion for controlling on/off switching of the first to third semiconductor switches. The middle point (N1) between the first semiconductor switch and the second semiconductor switch is connected to the sub-modules of the upper converter arm. The middle point (N2) between the second semiconductor switch and the third semiconductor switch is connected to a load connection terminal of the MMC converter. The middle point (N3) between the third semiconductor switch and the energy storage portion is connected to the sub-modules of the lower converter arm.
Inventors:
OH SUNG MIN (KR)
LEE JUN CHOL (KR)
LEE JOO YEON (KR)
LEE JUN CHOL (KR)
LEE JOO YEON (KR)
Application Number:
PCT/KR2017/014129
Publication Date:
July 05, 2018
Filing Date:
December 05, 2017
Export Citation:
Assignee:
HYOSUNG CORP (KR)
International Classes:
H02M1/32; H02J3/18; H02J3/36; H02M7/483
Attorney, Agent or Firm:
NAMCHON PATENT AND LAW FIRM (KR)
Download PDF: