Performance Improvement of a Grid-Tied Neutral-Point-Clamped 3-φ Transformerless Inverter Using Model Predictive Control
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Department of Electrical Engineering, Faculty of Engineering, University of Tabuk, Tabuk 47913, Saudi Arabia
2
Department of Electrical Power, Faculty of Engineering, Cairo University, Cairo 12613, Egypt
*
Authors to whom correspondence should be addressed.
Processes 2019, 7(11), 856; https://doi.org/10.3390/pr7110856
Received: 29 September 2019
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Revised: 27 October 2019
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Accepted: 5 November 2019
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Published: 15 November 2019
(This article belongs to the Special Issue Optimization for Control, Observation and Safety)
Grid-connected photovoltaic (PV) systems are now a common part of the modern power network. A recent development in the topology of these systems is the use of transformerless inverters. Although they are compact, cheap, and efficient, transformerless inverters suffer from chronic leakage current. Various researches have been directed toward evolving their performance and diminishing leakage current. This paper introduces the application of a model predictive control (MPC) algorithm to govern and improve the performance of a grid-tied neutral-point-clamped (NPC) 3-φ transformerless inverter powered by a PV panel. The transformerless inverter was linked to the grid via an inductor/capacitor (LC) filter. The filter elements, as well as the internal impedance of the grid, were considered in the system model. The discrete model of the proposed system was determined, and the algorithm of the MPC controller was established. Matlab’s simulations for the proposed system, controlled by the MPC and the ordinary proportional–integral (PI) current controller with sinusoidal pulse width modulation (SPWM), were carried out. The simulation results showed that the MPC controller had the best performance for earth leakage current, total harmonic distortion (THD), and the grid current spectrum. Also, the efficiency of the system using the MPC was improved compared to that using a PI current controller with SPW modulation.
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Keywords:
PV; 3-φ transformerless inverter; NPC; boost converter; model predictive control; maximum power point tracking
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MDPI and ACS Style
Albalawi, H.; Zaid, S.A. Performance Improvement of a Grid-Tied Neutral-Point-Clamped 3-φ Transformerless Inverter Using Model Predictive Control. Processes 2019, 7, 856. https://doi.org/10.3390/pr7110856
AMA Style
Albalawi H, Zaid SA. Performance Improvement of a Grid-Tied Neutral-Point-Clamped 3-φ Transformerless Inverter Using Model Predictive Control. Processes. 2019; 7(11):856. https://doi.org/10.3390/pr7110856
Chicago/Turabian StyleAlbalawi, Hani, and Sherif A. Zaid. 2019. "Performance Improvement of a Grid-Tied Neutral-Point-Clamped 3-φ Transformerless Inverter Using Model Predictive Control" Processes 7, no. 11: 856. https://doi.org/10.3390/pr7110856
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