Author : Hao Jiang
Publisher :
ISBN 13 :
Total Pages : 186 pages
Book Rating : 4.:/5 (12 download)
Book Synopsis Distributed Control of Modular Multilevel Converter by : Hao Jiang
Download or read book Distributed Control of Modular Multilevel Converter written by Hao Jiang and published by . This book was released on 2018 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Modular Multilevel Converter (MMC) or the Bridge of Bridge Converter (BoBC) are emerging to be a technically viable approach for realizing a wide range of power conversion applications, thanks to its use of identical power circuit modules as building blocks, and scalability for freely extending to multiple series levels or parallel branches. In spite of this, the application range of MMC have been highly restricted by two major disadvantages. (1) While commercial applications of MMC at utility scale has expanded in recent years, where robustness is as important as power rating, they have no share in the market for board and chip level power conversion applications, where power density and overall price are highly sought after, due to size constraints and profit margins. (2) Control strategy and data communication interface between MMC system controller and MMC modules become increasingly complicated as more modules are added into the system. This disadvantage overpowers the advantages brought by the MMC topology due to increased system control complexity. The proposed MMC system in this research aims at overcome the disadvantages of conventional MMC system, by developing reconfigurable system architecture based on identical modules at chip-level or board-level, including the control system. In light of this, following solutions are presented in this research following a progressive manner: (1) Design similarities in modularity and scalability between MMC and very large scale integration (VLSI) are identified as an advantageous feature that enables mass manufacture of MMC modules. Using modern fabrication techniques of integrated circuit (IC), partially integrated prototype modules have been developed and fabricated, and MMC prototypes for different power conversion applications have are demonstrated based on these modules. (2) A distributed control strategy with minimal requirements for global control and communications that is specially tailored for the MMC is proposed and demonstrated. The conventional pulse width modulation (PWM) with stringent time synchronization requirements is replaced by the delta-sigma modulation (DSM) which requires no switching signal synchronization, with a primary goal to reduce the required data transfer rate. Digital controller is embedded into each module and generates control commands locally, with a goal to reduce the total amount of tasks been processed by the system controller, and reduced the state variables required for feedback. In order to demonstrate these solutions, various designs, simulations, fabrications, prototyping and testing have been conducted at different scales ranging from chip-level to system level. The experimental results establish the viability of the proposed approach, and analysis of the experimental data has confirmed the technical feasibility of concepts. Directions for further investigations to translate this work to practice are identified in the thesis.