Excitation inrush current identification method, device and equipment used in MMC-HVDC, and medium

• Main Authors: LI ZHENG, SUN XU, SHEN XUHUI, PENG CHENG, LI CHUNHUA, HU XUJIA, ZHANG JUNYANG, CHEN YIJING, ZHONG YINGMING, LIU MINGYE, GUO XIAOJIANG, ZENG XIAOWEI, LAN XI
• Format: Patent
• Language: Chinese; English
• Published: 04.06.2024
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; SYSTEMS FOR STORING ELECTRIC ENERGY; TESTING

The invention provides a magnetizing inrush current identification method, device and equipment for MMC-HVDC and a medium. A high-voltage direct-current power transmission system MMC-HVDC based on a modular multilevel converter at least comprises a first converter transformer on a triangular wiring side and a second converter transformer on a star wiring side; the method comprises the steps of obtaining a first phase current sequence of a first converter transformer and a second phase current sequence of a second converter transformer in a preset time period, and performing current conversion processing on each first phase current in the first phase current sequence to obtain a first line current sequence, the method comprises the steps of obtaining a first line current sequence in the MMC-HVDC, filtering zero-sequence current in each second phase current in the second phase current sequence to obtain a third phase current sequence, and identifying whether excitation inrush current exists in the MMC-HVDC acco