Investigation on Control Strategies for a Single-Phase Photovoltaic Inverter Using PSCAD/EMTDC Software
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Federal University of Rio Grande do Sul – UFRGS
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Cristiano Luiz Henz   

Federal University of Rio Grande do Sul – UFRGS
Power Electronics and Drives 2021;6 (41):75-99
Electric power produced through photovoltaic conversion is increasing due to the need of reducing fossil fuel burning. Photovoltaic systems are becoming more competitive and playing an important role in the renewable energies market share. Im-provements in the power electronics employed in the DC/AC conversion are topics of interest in the seek of more efficient and eventually reduced-cost inverters. The goal of this paper is to perform an investigation of control strategies and propose a topology for a single-phase DC/AC converter for photovoltaic arrays using the simulation software PSCAD. The circuit proposed employs an isolating transformer to a grid-connected inverter. The control strategy proposed uses the instantaneous reactive power theory (p–q theory) and phase-locked loop (PLL). The p-q theory uses two virtual axes in the Park Transformation which provide to the control system good dynamic response, accuracy, and decoupling. Computer simulations using the electromagnetic transient software PSCAD show the efficiency of the proposed strategy for a single-phase inverter. The control strategy and topology are considerably simple and easy to future implementation using a Digital Signal Processor (DSP). The results provide insights into new power electronics solutions, which can improve the efficiency and efficacy of current available DC/AC converters for photovoltaic systems.
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