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

• Main Authors: DAVIDSON CRAIG, KEITHLEY ANDREW, OLAQUIAGA SAN EMETERIO MANUEL, HOUGHTON PATRICK
• Format: Patent
• Language: Chinese; English
• Published: 27.06.2023
• 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

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 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 includes at least one pair of series connected switching elements connected in parallel with a plurality of series connected energy storage devices. Each energy storage device has an auxiliary power supply unit connected in parallel therewith to obtain energy therefrom for supply to an auxiliary chain link module control circuit. The chain link module also includes a modulation controller interconnected between each auxiliary power supply unit and the auxiliary chain link module control circuit. The modulation controller is configured to modulate a proportion of energy supplied by each auxiliary power supply unit to the auxiliary chain link module control circuit.