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Improved double-mode model predictive control scheme with reduced output dv/dt for modular multilevel converters

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Abstract

Despite several advantages of modular multilevel converters (MMCs), like easy scalability, modularity, and better output quality, it is required to control their internal dynamics, besides the output current control. This paper proposes a double-mode model predictive control (MPC) scheme for three-phase MMCs, with highly-reduced computational load. Because of MPC inherent features like the capability of including several control objectives in a single cost function and excellent dynamic performance, it is considered as an attractive choice for controlling MMCs. However, the huge computational burden is an important obstacle to implement MPC for this topology. The proposed scheme consists of two separate modes for the dynamic and steady-state conditions, in which the admissible candidate vectors are appropriately restricted, based on the special requirements of each operating state. In the dynamic operating mode, achieving fast response is significantly important; while circulating current reduction and lower output dv/dt are considered as main control indexes at the steady state. Moreover, different exclusive cost functions are utilized in each mode, which would result in further reduction of the prediction calculations. Finally, the simulation and experimental results verify the satisfactory steady-state and dynamic performances, with balanced submodule capacitor voltages and reduced computational burden.

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Funding

The authors acknowledge the support of ANID through Projects FB0008 and 1210208.

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Authors and Affiliations

  1. School of Electrical Engineering, Iran University of Science and Technology (IUST), Tehran, Iran

    Mahyar Khosravi, Davood Arab Khaburi & Meysam Yousefzadeh

  2. Faculty of Engineering, Universidad San Sebastian, Santiago, Chile

    Jose Rodriguez

Authors
  1. Mahyar Khosravi
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  2. Davood Arab Khaburi
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  3. Meysam Yousefzadeh
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  4. Jose Rodriguez
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Contributions

MK, DAK and JR have established the basic theoretical background of the proposed method. MK has developed the algorithm of the proposed method. MK and MY have built the experimental setup. MK and MY have performed the simulation and experimental tests. MK has written and prepared the manuscript. JR has provided useful comments for improving the technical quality of the proposed algorithm and manuscript.

Corresponding author

Correspondence to Davood Arab Khaburi.

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Khosravi, M., Arab Khaburi, D., Yousefzadeh, M. et al. Improved double-mode model predictive control scheme with reduced output dv/dt for modular multilevel converters. Electr Eng 104, 4151–4167 (2022). https://doi.org/10.1007/s00202-022-01587-4

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  • DOI: https://doi.org/10.1007/s00202-022-01587-4

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