IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE) e-ISSN: 2278-1676,p-ISSN: 2320-3331, Volume 10, Issue 4 Ver. II (July – Aug. 2015), PP 58-63 www.iosrjournals.org DOI: 10.9790/1676-10425863 www.iosrjournals.org 58 | Page Sliding Mode Control based Maximum Power Point Tracking of PV System Shital M. Mule 1 , Subhash S. Sankeshwari 2 1 ( PG Department, M.B.E.S’s College of Engineering, Ambajogai, Maharashtra, India) 2 (PG Department, M.B.E.S’s College of Engineering, Ambajogai, Maharashtra, India) Abstract: Solar Energy is the clean and renewable source of energy. Solar PV systems are gaining attraction for energy generation in these days of increasing energy demand due to its reducing cost and new researches carried on its efficient use. The solar cell is always operated at its Maximum Power Point for better results. There are different methods to search the maximum power point of PV system. In this paper, a Maximum Power Point Tracking method for Solar PV system using Sliding Mode Control is proposed. The PV system modeling practice under standard test conditions is discussed. The proposed controller strategy is robust technology in steady state and during varying environmental conditions. A DC/DC boost converter is utilized as a control actuator for the MPP tracking using PWM control on the switches. Simulation results in MATLAB/SIMULINK and discussion are provided to demonstrate the effectiveness of the proposed controller design. Keywords: Solar PV System, Maximum Power Point Tracking, Sliding Mode Control, Boost Converter, PWM (Pulse Width Modulation). I. Introduction In today’s life, electricity plays an important role. In electrical power system, consumers require uninterrupted power at rated frequency and voltage. Due to advantages of electrical energy over other energy sources, its demand is increasing rapidly. But due to limits of available conventional energy sources, we have to use the non-conventional energy sources effectively and efficiently to fulfil the increasing energy demands. Solar energy is the clean and renewable source of energy. It is widely available and free. Solar energy offers a very promising alternative because it is free, abundant, pollution free and distributed throughout the earth. Electrical energy can be obtained from sun using Solar PV technology. The PV devices has many advantages as, i) short time for designing and installation, ii) matching of output power with peak load demand, iii) static structure as it doesn’t contains any moving part [1]. A photovoltaic system directly converts energy from sunlight into electricity [2]. The basic element of PV system is the PV cell. The PV cell is a semiconductor device exposed to sunlight. The number of solar cells are connected in series and/or parallel to obtain the desired voltage and current and the grouping is called PV module. The number of modules are grouped together to form solar array. The voltage and current available at the terminals of PV devices can be directly fed to small loads such as calculators, DC motors, lamps etc [1]. Generally the output of PV system is processed using electronic converters for more sophisticated applications. For efficient use of PV system the PV cells are always operated at maximum power point. Nowadays, more research works has been focussed on how to extract maximum power effectively from the PV cells. There are so many algorithms have been developed for extracting the maximum available power in the panel such as P&O method, Incremental conductance method, Fractional V oc method, fractional I sc method. There are two ways to extract such as using solar tracking system and Maximum Power Point Tracking (MPPT). The Maximum Power Point Tracking (MPPT) is usually used as online control strategy to track the maximum output power operating point of the Photovoltaic system for different operating conditions of insolation and temperature of the PV system. MPPT with the PV system increases the power extraction efficiency to 97%.There are several methods to determine the Maximum Power Point of PV cell and control the converter output corresponding to the MPP (Maximum Power Point) to extract maximum power from cell. In this paper a Sliding Mode Controller based MPPT method is discussed. II. Modeling of PV System The basic unit of PV system is solar cell or PV cell. An individual solar cell produces direct current and power typically between 1 and 2 Watts, hardly enough to power most applications [5]. The numbers of pre- wired cells are connected in series to form a PV module. Modules are then connected in series to increase the voltage rating and in parallel to increase the current rating. Such a series and parallel combination of modules are called PV array [1]. The general structure of PV array is shown in Figure l. Solar Cell or Photovoltaic (PV) cell is a device that is made up of semiconductor materials such as silicon, gallium arsenide and cadmium telluride, etc. that converts sunlight directly into electricity. The voltage of a solar cell does not depend strongly