A modular multilevel converter type solid state transformer with internal model control method |
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| Affiliation: | 1. College of Electrical and Information Engineering, Hunan University, Changsha 410082, China;2. Energy Systems Institute, Russian Academy of Sciences, Irkutsk 664033, Russia;1. School of Electrical and Computer Engineering, Faculty of Engineering, University of Tehran, Iran;2. Department of Electrical Engineering, Sharif University of Technology, Iran;3. Department of Electrical Engineering, Faculty of Engineering, Bu Ali Sina University, Hamedan, Iran;1. Energy Systems Institute, Russian Academy of Sciences, Irkutsk 664033, Russia;2. College of Electrical and Information Engineering, Hunan University, Changsha 410082, China;3. Irkutsk National Research Technical University, Irkutsk 664074, Russia;1. Mataró School of Technology, (Tecnocampus Mataró-Maresme), Technical University of Catalonia, Mataró, Spain;2. Rovira i Virgili University, Tarragona, Spain;3. Estabanell Energia, Granollers, Spain;4. Technical University of Catalonia, Barcelona, Spain;1. Universitat Politecnica de Catalunya, Barcelona, Spain;2. Mataró School of Technology (Tecnocampus Mataró-Maresme), Technical University of Catalonia, Mataró, Spain;3. Rovira i Virgili University, Tarragona, Spain;4. Estabanell Energia, Granollers, Spain;1. School of Electrical Engineering, Southeast University, Nanjing 210096, China;2. School of Engineering, University of British Columbia, Kelowna, BC, Canada |
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| Abstract: | To overcome the limitation of the existing topologies and control strategies of SST, a modular multilevel converter type solid state transformer (MMC-SST) with internal model control method is proposed in this paper. First, the structure and operating characteristics of MMC-SST are analyzed, and accordingly its mathematical model of input- and output-stage under synchronous rotating coordinate is established. Secondly, a new kind of dual-loop control structure combine with the internal model control (IMC) current inner loop and proportional integral (PI) voltage outer loop is developed, according to the characteristics of IMC. Lastly, a simulation model is established and the typical operating cases, i.e., the grid side voltage variation, load change, grid and load side power factor deviation, are simulated. Results show that the internal model control based MMC-SST can run stable under the required power factor, and the good performances such as fast voltage and current response speed, strong anti-disturb ability to load, and enhanced robustness on system operation are demonstrated. |
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| Keywords: | Modular multilevel converter Solid state transformer Internal model control Synchronous rotating coordinate |
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