학술논문
A low switching frequency voltage balancing strategy of modular multilevel converter
Document Type
Conference
Author
Source
2013 IEEE International Conference of IEEE Region 10 (TENCON 2013) TENCON 2013 - 2013 IEEE Region 10 Conference (31194). :1-4 Oct, 2013
Subject
Language
ISSN
2159-3442
2159-3450
2159-3450
Abstract
The application of modular multilevel converter (MMC) to High Voltage Direct Current projects has to consider voltage balancing of the multiple floating capacitors. The common voltage balancing strategy, which based on the nearest level modulation (NLM) method, benefits from satisfied voltage balancing, but draws back the performance by its high switching frequency and high switching losses. This paper proposes a novel low switching frequency (NLSF) strategy to reduce the switching frequency by using the switching state of submodules (SMs) on the basis of good voltage balancing. A detailed 21-level back to back MMC-HVDC model has been built in PSCAD/EMTDC for demonstration. The simulation results show acceptable voltage balancing with dramatic reduction of the switching frequency by 61% in contrast to the common voltage balancing strategy.