Title:
METHOD FOR REMOVING DIRECT CURRENT COMPONENT AT OUTPUT TERMINAL OF MMC CONVERTER
Document Type and Number:
WIPO Patent Application WO/2018/124561
Kind Code:
A2
Abstract:
A method for removing a direct current component at an output terminal of an MMC converter according to an embodiment of the present invention comprises: a detection step of individually detecting charging voltages charged in capacitors of a plurality of sub-modules connected in series to each other in an MMC converter; a first output step of outputting an average value (Vdc_avg) of the individually detected charging voltages; a second output step of delaying the outputted average value (Vdc_avg) by a pre-determined phase to output a phase-delayed average value (Vdc_avg_θdelay); a third output step of outputting the average value (Vdc_avg) and the phase-delayed average value (Vdc_avg_θdelay) as a voltage (Vq_dc) of a q-axis component by using a pre-determined dq conversion unit; a calculation step of calculating an error between the voltage (Vq_dc) of the q-axis component and a 3-phase average voltage (Vq_dc_3φ_avg) for the voltage (Vq_dc) of q-axis component; and a fourth output step of outputting, through a pre-determined first proportional integration (PI) control unit, an offset voltage (Vref_dc_current) for reducing the error.
Inventors:
JEONG JONG KYOU (KR)
LEE DOO YOUNG (KR)
CHOI JONG YUN (KR)
LEE JOO YEON (KR)
PARK YONG HEE (KR)
LEE DOO YOUNG (KR)
CHOI JONG YUN (KR)
LEE JOO YEON (KR)
PARK YONG HEE (KR)
Application Number:
PCT/KR2017/014778
Publication Date:
July 05, 2018
Filing Date:
December 14, 2017
Export Citation:
Assignee:
HYOSUNG CORP (KR)
International Classes:
H02M1/14; H02M7/483
Attorney, Agent or Firm:
NAMCHON PATENT AND LAW FIRM (KR)
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