1. A Unified Power Flow Controller With Nine-Arm Modular Multilevel Converter
- Author
-
Feng Gao, Tao Xu, Decun Niu, Futian Qin, and Zhan Ma
- Subjects
Computer science ,business.industry ,020209 energy ,020208 electrical & electronic engineering ,Volume (computing) ,Topology (electrical circuits) ,02 engineering and technology ,Modular design ,Converters ,Inductor ,Control theory ,Harmonics ,Unified power flow controller ,0202 electrical engineering, electronic engineering, information engineering ,business ,Pulse-width modulation - Abstract
This paper proposes an improved topology of unified power flow controller (UPFC) based on nine-arm modular multilevel converter which could realize the same function as conventional UPFC composed of two back-to-back modular multilevel converters (MMCs). The proposed improved UPFC topology based on nine-arm MMC (9AMMC-UPFC) could offer significant advantages, that the number of required submodules and arm inductors could be reduced by 25% and 50%, respectively over the traditional UPFC based on MMCs. Therefore, the system volume and cost could be drastically reduced. The structure and operation principle of proposed 9AMMC-UPFC are firstly illustrated in this paper. Next, phase-shifted carrier-based PWM technique including capacitor voltage balancing control is briefly described for the operation of proposed 9AMMC-UPFC. Then, in order to suppress the exclusive odd-order harmonics in circulating currents of proposed 9AMMC-UPFC, circulating current suppression control method is put forward. Finally, the performance of the proposed 9AMMC-UPFC are evaluated by the simulation and experiment results.
- Published
- 2018