TAB-based direct current bus superposition type doubly-fed strong excitation converter and TAB-based direct current bus superposition type doubly-fed strong excitation method

• Main Authors: LIU GUOFENG, XU BAIFENG, ZHAO RENDE, ZHANG CHENGYI, GU JIATENG, SHI HONGLEI, LIAN YI, SU HENG, LIU YUANBING, HOU ZHEN, XU JUNTAO, YIN XIAO
• Format: Patent
• Language: Chinese; English
• Published: 14.03.2023
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

The invention provides a TAB-based DC bus superposition type doubly-fed strong excitation converter and method, and the converter comprises a grid-side converter and a rotor-side converter, the grid-side converter and the rotor-side converter are connected through a DC link, and the DC link comprises a TAB and a series-parallel switching circuit; the TAB comprises a TAB1 and a TAB2, two output ends of the TAB1 and two output ends of the TAB2 are respectively connected with a series-parallel switching circuit, and the two series-parallel switching circuits are respectively connected to a positive half bus and a negative half bus of the rotor side converter; and the series-parallel connection switching circuit performs parallel connection/series connection switching of the output ends of the TAB1 and the TAB2 according to the operation state of the power grid. According to the method, the direct current bus voltage can be kept at a low level under the condition that the power grid voltage is normal so as to ens