Improvements in or relating to chain link modules for voltage source converters

• Main Author: DAVIDSON CRAIG
• Format: Patent
• Language: Chinese; English
• Published: 30.08.2022
• 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

In the field of chain link modules for voltage source converters, there is a need for an improved chain link module. A chain link module (10) for connection in series with other chain link modules to form a chain link converter that is selectively operable to provide a step variable voltage source within a voltage source converter, the chain link module (10) comprising a first pair (12) of series connected switching elements (14A, 14B), the first and second series-connected energy storage devices (18, 20) are separated by a first connection terminal (16) and are connected in parallel with the first and second series-connected energy storage devices (18, 20). The chain link module (10) further comprises a second pair (22) of series-connected switching elements (14C, 14D) separated by a second connection terminal (24) and connected in parallel with one or the other of the first and second energy storage devices (18, 20). In use, switching of the switching elements (14A, 14B, 14C, 14D) selectively: (i) directs a