Affiliation:
1. School of Electrical Engineering, Tiangong University, Tianjin 300387, China
2. Advanced Electrical Equipment Innovation Center, Zhejiang University, Hangzhou 311107, China
Abstract
Compared with other topologies, the modular multilevel converter (MMC) has the advantages of higher scalability and lower harmonic distortion. When carrier-based pulse-width modulation approaches are used for the MMC, the number of carriers increases for more sub-modules, and the complexity of the control and the memory required increases as a result. In addition, the synchronization of several carriers is another issue. Due to the unique constructional characteristics of the MMC, circulating currents will be generated internally, causing distortions in the arm currents and, thus, unnecessary converter losses. In this paper, an improved 2N+1 pulse-width modulation approach with low control complexity and a circulating current suppression strategy are proposed. Firstly, the conventional carrier phase-shifted 2N+1 pulse-width modulation approach is improved so that the number of carrier signals adopted in each arm is always two. Secondly, the redundant switching states are used to suppress the circulating current. Finally, the effectiveness of the proposed strategy is verified experimentally. The results show that the proposed method reduces the control complexity while retaining the output performance. Meanwhile, the circulating current can be suppressed.
Funder
The National Natural Science Foundation of China
The Zhejiang Provincial Basic Public Welfare Research Projects
Reference27 articles.
1. Evolution of Topologies, Modeling, Control Schemes, and Applications of Modular Multilevel Converters;Dekka;IEEE J. Emerg. Sel. Top. Power Electron.,2017
2. Operation, Control, and Applications of the Modular Multilevel Converter: A Review;Debnath;IEEE Trans. Power Electron.,2015
3. Analysis of the Phase-Shifted Carrier Modulation for Modular Multilevel Converters;Li;IEEE Trans. Power Electron.,2014
4. Bekhouche, R., Khoucha, F., and Benrabah, A. (2020, January 16–17). Comparison of PWM Techniques for Modular Multilevel Converter: A Comparison Based on Different Voltage Level Waveforms. Proceedings of the 2020-1st International Conference on Communications, Control Systems and Signal Processing (CCSSP), El Oued, Algeria.
5. Ronanki, D., and Williamson, S.S. (2019, January 17–21). A Novel 2N+1 Carrier-Based Pulse Width Modulation Scheme for Modular Multilevel Converters with Reduced Control Complexity. Proceedings of the 2019 IEEE Applied Power Electronics Conference and Exposition (APEC), Anaheim, CA, USA.
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