MPPT Controllers Based on Sliding-Mode Control Theory and Fuzzy Logic in Photovoltaic Power Systems: A Comparative Study
In this chapter we will deal with a comparative study between two control methods for maximum power point tracking (MPPT) algorithms in photovoltaic (PV) systems. The two MPPT controllers considered in this chapter are: the Fuzzy Logic Controller (FLC) an
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MPPT Controllers Based on Sliding-Mode Control Theory and Fuzzy Logic in Photovoltaic Power Systems: A Comparative Study Radhia Garraoui, Mouna Ben Hamed and Lassaad Sbita Abstract In this chapter we will deal with a comparative study between two control methods for maximum power point tracking (MPPT) algorithms in photovoltaic (PV) systems. The two MPPT controllers considered in this chapter are: the Fuzzy Logic Controller (FLC) and the Sliding Mode Controller (SMC). The MPPT controller based on the fuzzy-logic-algorithm uses directly the DC-DC converter duty cycle as a control variable and it provides a fast response and good performances against the climatic and load changes. The SMC exhibits a very fast response for tracking the maximum power point (MPP) for photovoltaic systems. The input parameters are the voltage and the current, the duty cycle is used to generate the optimal MPP under different operating conditions. Simulation results show that both algorithms can effectively perform the MPPT hence improving the efficiency of PV systems. Keywords Photovoltaic systems · MPPT · Fuzzy logic controller · Sliding mode controller
R. Garraoui (B) · M. Ben Hamed · L. Sbita Research Unit on Photovoltaic, Wind and Geothermal Systems, National Engineering School of Gabes, University of Gabes, Omar Ibn Elkhattab Street 6029, Gabes, Tunisia e-mail: [email protected] M. Ben Hamed e-mail: [email protected] L. Sbita e-mail: [email protected] © Springer Science+Business Media Singapore 2017 N. Derbel et al. (eds.), Applications of Sliding Mode Control, Studies in Systems, Decision and Control 79, DOI 10.1007/978-981-10-2374-3_12
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Nomenclature G Gn T Tr i pv IL I ph Irr V pv A
: : : : : : : : : :
Global insulation (W/m2 ) Reference insulation (W/m2 ) Cell Junction temperature (◦ C) Reference cell temperature (◦ C) Output PV current (A) Inductance current (A) Light-generated current (A) Saturation current (A) at Tr e f PV output voltage (V) Ideality factor
α Kb Eg q C L Ki rci rl, pv
: Duty cycle : Boltzmann constant K b = 1.3806 × 10−23 : Band gap energy (eV) : Charge of an electron (C) : Capacitors (F) : Inductance (H) : a Isc /T Coefficient (A/K) : Parasitic resistance (Ω) : Parasitic resistance (Ω)
12.1 Introduction Photovoltaic (PV) is a manner of converting solar energy into direct current electricity using semi conducting materials that manifest the photovoltaic effect, a phenomenon commonly studied in physics. A photovoltaic system employs solar panels composed of a number of solar cells to supply usable solar power. Generating power from solar PV has long been seen as a clean, sustainable energy technology, which draws upon the planet’s most plentiful and widely distributed renewable energy source which is the sun. The direct conversion of sunlight to electricity occurs without any moving parts or environmental emissions during operation. Conventional energy resources in the world are threatened. Moreover, they emit large amounts of greenhouse gas emissions
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