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A Simplified Optimal-Switching-Sequence MPC with Finite-Control-Set Moving Horizon Optimization for Grid-Connected Inverter

1
New Energy Research Center, School of Electric Power, South China University of Technology, Guangzhou 510640, China
2
Dongguan DRN New Energy CO, LTD., Dongguan 523000, China
3
Guangdong Key Laboratory of Clean Energy Technology, School of Electric Power, South China University of Technology, Guangzhou 510640, China
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(4), 457; https://doi.org/10.3390/electronics8040457
Received: 15 March 2019 / Revised: 13 April 2019 / Accepted: 22 April 2019 / Published: 25 April 2019
(This article belongs to the Section Power Electronics)
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Abstract

Optimal-switching-sequence model-predictive-control (OSS-MPC) strategy, a popular kind of continuous-control-set MPC (CCS-MPC), has been used to address the variable frequency of finite-control-set MPC (FCS-MPC). Since the digital signal processor (DSP) does not have a dedicated divider, it requires a large amount of computation for the division operations in OSS searching. Here, a simplified OSS-MPC absorbing the merits of FCS-MPC is proposed to reduce the computational burden of conventional OSS-MPC. The proposed method uses a novel cost function whose candidates are the finite center vectors instead of switching sequences, which can avoid duty cycle computation and convert the moving horizon optimization of CCS-MPC into that of FCS-MPC. Besides, the derivatives of the active and reactive powers are divided into the constant terms and variable terms. The constant terms are extracted from the cost function. Experimental and simulation results show that the computational amount of the proposed algorithm is only 36.34% of that of the conventional OSS-MPC. Meanwhile, the simplified OSS-MPC still maintains the excellent dynamic and steady state performance of conventional OSS-MPC. View Full-Text
Keywords: grid-connected inverter; model predictive control; cost function; complexity optimization grid-connected inverter; model predictive control; cost function; complexity optimization
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Kang, L.; Cheng, J.; Hu, B.; Luo, X.; Zhang, J. A Simplified Optimal-Switching-Sequence MPC with Finite-Control-Set Moving Horizon Optimization for Grid-Connected Inverter. Electronics 2019, 8, 457.

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