Soft start control method of distributed energy storage grid-connected converter

• Main Authors: CAI LEI, LI JIAN, LI BIN, WANG ZHENZHEN, GAO XIUQING, ZHANG TIANMING, FAN RUIQING, GUO LINGXU, ZHAO BEITAO, LI QUANYOU, WEN WEIJIE, CHEN JIAN, LIU FANG, HAO YI, LYU RUI
• Format: Patent
• Language: Chinese; English
• Published: 11.04.2023
• 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; 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; SYSTEMS FOR STORING ELECTRIC ENERGY

The invention discloses a soft start method of a distributed energy storage grid-connected converter, which is characterized in that the AC side of the converter is not connected with a starting resistor, and a thyristor antiparallel diode module is arranged in a three-phase upper bridge arm; when the full-control device is started, the full-control device is kept in a locked state, the initial value of the trigger angle alpha of the thyristor is set to be 120 degrees, and when it is detected that the direct-current side voltage Udc is smaller than the direct-current side voltage threshold value Uset and the bridge arm current peak value Ibrig is smaller than the bridge arm current threshold value Iset, the trigger angle alpha is gradually reduced at the interval of 1 degree in the next control period; when the bridge arm current peak value Ibrig is larger than or equal to the bridge arm current threshold value Iset, the trigger angle alpha is kept unchanged in the next control period; and when the direct cur