Simplified Model Predictive Current Control of Four-Level Nested Neutral Point Clamped Converter

Rao Atif, Mannan Hassan, Muhammad Bilal Shahid, Hafiz Mudassir Munir (), Mahmoud S. R. Saeed, Muhammad Shahzad, Semih Isik and Mohammed Alharbi
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Rao Atif: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Mannan Hassan: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Muhammad Bilal Shahid: Department of Electronic Engineering, The Islamia University, Bahawalpur 63100, Pakistan
Hafiz Mudassir Munir: Department of Electrical Engineering, Sukkur IBA University, Sukkur 65200, Pakistan
Mahmoud S. R. Saeed: Department of Electrical Engineering, Faculty of Engineering, South Valley University, Qena 83523, Egypt
Muhammad Shahzad: Department of Electrical Engineering, Muhammad Nawaz Sharif University of Engineering and Technology, Multan 60000, Pakistan
Semih Isik: Department of Electrical and Computer Engineering, North Carolina State University, Raleigh, NC 27606, USA
Mohammed Alharbi: Department of Electrical Engineering, College of Engineering, King Saud University, Riyadh 11421, Saudi Arabia

Sustainability, 2023, vol. 15, issue 2, 1-17

Abstract: Model predictive control (MPC) is an efficient and growing approach to power converter control. This paper proposes an improved and simplified model predictive current control (MPCC) technique for a four-level nested neutral point clamped (4L-NNPC) converter. Conventional MPCC exhibits better performances as compared to the conventional linear control system such as fast dynamic response, consideration of the system constraints, and nonlinearities. However, the application of the conventional model predictive current control (MPCC) approach on complex systems provokes a significant number of calculations, which is the main hurdle to its practical implementation. To fix this flaw, this paper proposes an effective algorithm to shorten the execution time of the conventional MPCC. In this proposed technique, 216 current predictions of the conventional MPCC are skipped and converted into one required voltage vector (RVV) prediction. With this equivalent reference voltage transformation, the calculation burden of MPCC is significantly reduced, while the output performance is not influenced. The results of the simplified MPCC for the 4L-NNPC converter are analyzed and compared with the conventional MPCC. The computational time is reduced by 19.56% using the simplified MPCC, while keeping an approximately similar error of output currents. The switching frequency and total harmonic distortion (THD) of the proposed method are reduced by 8.16% and 0.07%, respectively, as compared to the conventional technique. These results demonstrate the fact that that the performance of a conventional MPCC is enhanced with the proposed MPCC. The proposed algorithm can be applied to several inverter topologies.

Keywords: nested neutral point clamped converter; model predictive current control; total harmonic distortion (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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