Title:
DC VOLTAGE SENSOR REDUCTION BASED MODULATION METHOD FOR DC COUPLED CONVERTER
Document Type and Number:
WIPO Patent Application WO/2024/027001
Kind Code:
A1
Abstract:
A DC voltage sensor reduction based modulation method for a DC coupled converter. A DC coupled converter (5) comprises three power modules (1, 2, 3). The modulation method specifically comprises: obtaining a voltage modulation wave vr* and a current reference value ig* of the DC coupled converter (5); dividing the voltage modulation wave vr* and the current reference value ig*, and dividing an on-off state of the DC coupled converter (5) according to the division result; and when a DC voltage sensor of an electrolytic capacitor in the intermediate power module (2) is removed, completing DC voltage sensor modulation according to the voltage modulation wave vr* and a difference value between the DC voltages on electrolytic capacitors in the other two power modules (1, 3). According to the modulation method, when the DC voltage sensor of the electrolytic capacitor in the intermediate power module (2) is removed, the DC voltages of the modules in the DC coupled converter (5) can still be balanced, and the quality of the grid-connected current is not affected by the fault, so that normal operation can be achieved under the reduction of DC voltage sensors.
Inventors:
FANG HUI (CN)
ZHOU JINGSEN (CN)
CHEN YONGTAO (CN)
MU FAN (CN)
ZHU SHENGYI (CN)
WANG CHENG (CN)
LI LEI (CN)
XIANG HONGJI (CN)
YU YANAN (CN)
XIAO QIANG (CN)
HU LINING (CN)
WEN ZHONGYI (CN)
ZHOU JINGSEN (CN)
CHEN YONGTAO (CN)
MU FAN (CN)
ZHU SHENGYI (CN)
WANG CHENG (CN)
LI LEI (CN)
XIANG HONGJI (CN)
YU YANAN (CN)
XIAO QIANG (CN)
HU LINING (CN)
WEN ZHONGYI (CN)
Application Number:
PCT/CN2022/121236
Publication Date:
February 08, 2024
Filing Date:
September 26, 2022
Export Citation:
Assignee:
STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INSTITUTE (CN)
STATE GRID CORP CHINA (CN)
STATE GRID CORP CHINA (CN)
International Classes:
H02M3/158; H02J3/36; H02J3/38; H02M1/088; H02M1/32
Foreign References:
| CN111342690A | 2020-06-26 | |||
| CN111342687A | 2020-06-26 | |||
| CN104092239A | 2014-10-08 |
Attorney, Agent or Firm:
SCIHEAD IP LAW FIRM (CN)
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