Minimization of currents harmonics injected for grid connected photovoltaic systems using duty-cycle modulation techniqu
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Minimization of currents harmonics injected for grid connected photovoltaic systems using duty-cycle modulation technique Mathieu Jean Pierre Pesdjock1,2 · Justin Roger Mboupda Pone1 Marc Rostand Douanla1,2 · Godpromesse Kenne1
· Daniel Tchiotsop1 ·
Received: 22 April 2020 / Revised: 13 August 2020 / Accepted: 17 October 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this paper we investigate a new modulation technique for the control signals of grid-connected PV inverters. The inverters are connected to the grid via an L-filter. This technique improves the quality of the energy injected into grid by minimising the THD of the currents. Indeed, the harmonics of currents higher than the fundamental and DC component are the cause of several disturbances and electrical damage. Recent studies have shown that the THD of the currents injected into the grid by PV inverters become more important for low sunshine conditions. We propose a solution to this problem using a signal modulation technique that takes into account the advantages of PWM and DCM techniques. An adaptive law of the control gain is proposed in order to establish a new control law that helps to minimize the THD of the current. The results presented validate the approach discussed and rank our method above conventional PWM. The performances of this new method give it a special attention in power quality management. Keywords PV · THD · Inverter · Grid · PWM · Harmonics
1 Introduction The use of photovoltaic power is becoming more important because its non-polluting character, long term economic factor and abundance over a large area of the globe [1,2]. Its exploitation is one of the solutions to alleviate the negative impact of fossil fuels based energies on the environment [3,4]. Thus, to cup with the energy deficit in AC power grids, solar energy sources connected through inverters can be used [5]. The use of grid connected inverters is justified by the fact that the power produced by PV systems is continuous. To ensure the maximum power extraction by a PV system under fluctuating atmospheric conditions, it is necessary to implement a MPPT algorithm [6,7] around a DC–DC converter. The inverter therefore converts the continuous energy of the DC–DC converter into alternative form in order to feed the
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Justin Roger Mboupda Pone [email protected]
1
Unité de Recherche d’Automatique et Informatique Appliquée (UR-AIA), University of Dschang, IUT FV of Bandjoun, Dschang, Cameroon
2
Unité de Recherche de Matière Condensensée, d’Electronique et traitement du Signal (UR-MACETS), University of Dschang, Faculty of Sciences, Dschang, Cameroon
grid [8]. However, the use of grid-connected photovoltaic systems contributes to the injection of current harmonics, especially in low sunlight conditions [8]. These harmonic currents have a negative impact on the injected power quality and causes several disturbances in the power grid [9]. The cables overheating, the capacitor breakdown, the increase in the line losses, the degradati
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