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Control of Modular Multilevel Converter with Parallel Connectivity-Application to Battery Systems

Publication ,  Journal Article
Goetz, SM; Li, Z; Liang, X; Zhang, C; Lukic, SM; Peterchev, AV
Published in: IEEE Transactions on Power Electronics
November 1, 2017

This paper presents a multiobjective real-time controller for a modular multilevel converter capable of parallel module connectivity, the so-called modular multilevel series parallel converter (MMSPC). The MMSPC topology allows the batteries to be dynamically rewired in various series-parallel configurations, generating a wide range of output voltage levels. The novel control method parallelizes the modules to balance their voltages without the need for individual module voltage monitoring. Additionally, the controller optimizes across the large number of feasible system configurations to minimize switching and conduction losses. Finally, the controller efficiently encodes the system configuration with module interconnection states rather than the module switch states, which substantially simplifies control. Furthermore, this work experimentally validates the MMSPC topology and concept. In the prototype, the parallel mode reduced the system losses at 5 kW output power by 18% and 24% for load power factors of 1.0 and 0.8, respectively. Sensorless balancing via parallelization maintained well-matched module voltages (standard deviation = 0.045 V) over a 5-h battery discharge with highly variable load current. The reduced conduction losses and simple balancing capability of the MMSPC can enable new applications at medium and low voltages that benefit from its high-quality output, elimination of filtering magnetics, fast response, and modularity.

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Published In

IEEE Transactions on Power Electronics

DOI

ISSN

0885-8993

Publication Date

November 1, 2017

Volume

32

Issue

11

Start / End Page

8381 / 8392

Related Subject Headings

  • Electrical & Electronic Engineering
  • 4009 Electronics, sensors and digital hardware
  • 4008 Electrical engineering
  • 0906 Electrical and Electronic Engineering
 

Citation

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Goetz, S. M., Li, Z., Liang, X., Zhang, C., Lukic, S. M., & Peterchev, A. V. (2017). Control of Modular Multilevel Converter with Parallel Connectivity-Application to Battery Systems. IEEE Transactions on Power Electronics, 32(11), 8381–8392. https://doi.org/10.1109/TPEL.2016.2645884
Goetz, S. M., Z. Li, X. Liang, C. Zhang, S. M. Lukic, and A. V. Peterchev. “Control of Modular Multilevel Converter with Parallel Connectivity-Application to Battery Systems.” IEEE Transactions on Power Electronics 32, no. 11 (November 1, 2017): 8381–92. https://doi.org/10.1109/TPEL.2016.2645884.
Goetz SM, Li Z, Liang X, Zhang C, Lukic SM, Peterchev AV. Control of Modular Multilevel Converter with Parallel Connectivity-Application to Battery Systems. IEEE Transactions on Power Electronics. 2017 Nov 1;32(11):8381–92.
Goetz, S. M., et al. “Control of Modular Multilevel Converter with Parallel Connectivity-Application to Battery Systems.” IEEE Transactions on Power Electronics, vol. 32, no. 11, Nov. 2017, pp. 8381–92. Scopus, doi:10.1109/TPEL.2016.2645884.
Goetz SM, Li Z, Liang X, Zhang C, Lukic SM, Peterchev AV. Control of Modular Multilevel Converter with Parallel Connectivity-Application to Battery Systems. IEEE Transactions on Power Electronics. 2017 Nov 1;32(11):8381–8392.

Published In

IEEE Transactions on Power Electronics

DOI

ISSN

0885-8993

Publication Date

November 1, 2017

Volume

32

Issue

11

Start / End Page

8381 / 8392

Related Subject Headings

  • Electrical & Electronic Engineering
  • 4009 Electronics, sensors and digital hardware
  • 4008 Electrical engineering
  • 0906 Electrical and Electronic Engineering