Novel forced commutation LCC converter topological structure and control method

• Main Authors: ZHANG XIANGYU, REN MAOXIN, YANG GUANGZHAO, ZHOU XINGXING, CUI LU, QI LEI
• Format: Patent
• Language: Chinese; English
• Published: 19.09.2023
• 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

A novel forced commutation LCC converter topological structure and a control method thereof are used for improving commutation failure immunity of an LCC-HVDC system, and are characterized in that the novel LCC converter topological structure comprises six pulse thyristor converter valves and six half-control LC oscillation modules M1-M6; wherein each valve arm of the six-pulse thyristor converter valve is connected in parallel with one half-controlled LC oscillation module. Compared with the existing scheme that the auxiliary commutation module is connected in series in the LCC valve arm, the half-control type LC oscillation module is connected in parallel at the two ends of the LCC valve arm, the original electrical wiring of the LCC does not need to be changed, the transformation is easier, the cost is lower, and the method is suitable for the transformation of the existing LCC-HVDC engineering. 一种强迫换相的新型LCC换流器拓扑结构及其控制方法，用于提高LCC-HVDC系统的换相失败免疫能力，其特征为：所述新型LCC换流器拓扑结构包括六脉动晶闸管换流阀和六个半控型LC振荡模块M1-M6；其中，六脉动晶闸管换流阀的每