Loss balance control method for high-capacity optical storage direct-flexible MMC converter

• Main Authors: JIA ZAN, LUO YONGJIE, LI QIFEN, WANG QIANGGANG, ZHOU NIANCHENG, CHI YUAN, HUANG PENG, SONG YONGHUI
• Format: Patent
• Language: Chinese; English
• Published: 04.04.2023
• 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; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

The invention belongs to the technical field of medium-voltage power systems, and particularly relates to a loss balance control method of a high-capacity light-storage direct-current flexible MMC converter, which comprises the following steps of: S1, injecting a traditional zero-sequence voltage into a reference voltage of each bridge arm as a zero-sequence component; s2, taking 0 as the input quantity of a double-frequency circulating current PR regulator, and injecting double-frequency circulating current suppression compensation quantity delta ucir, i into the reference voltage of each bridge arm of the MMC; s3, based on the bridge arm reference voltage waveform after injection of the double-frequency circulation suppression compensation amount delta ucir, i, phase shifting is carried out on the zero-sequence voltage injection amount in each complete fundamental frequency period; s4, comparing the final modulation wave of each sub-module in the bridge arm with the triangular carrier, and generating a trig