Abstract
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.
Highlights
Renewable energy utilization is currently expanding due to global warming awareness and the predicted depletion of fossil fuels
This paper introduces an model predictive control (MPC) algorithm to control and improve the performance of a grid-tied
The maximum power point tracking (MPPT) operation of the PV can be reached by regulating the boost converter
Summary
Renewable energy utilization is currently expanding due to global warming awareness and the predicted depletion of fossil fuels. New and amazing topologies—called transformerless PV systems—have been introduced [2,3] These topologies reduce the drawbacks of transformer-based systems, they introduce an earth leakage current problem. There are two approaches in the literature for manipulating the leakage current problem of three-phase transformerless systems: the inverter modulation technique and the inverter structure or topology. A new three-phase transformerless inverter topology called H7 [10,11] has been introduced to minimize the leakage current with modified. The authors in Reference [15] presented two PWM approaches to decrease the common-mode current (CMC) in a three-level NPC inverter These techniques improved the CMV, but they increased the voltage ripples and THD. In Reference [27], a finite control set MPC technique was applied to remove the leakage current of a T-type transformerless three-level inverter.
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