en 1-Distributed Generation Distributed Generation Research Paper Research Paper In this paper, a robust Maximum Power Point Tracking (MPPT) for PV array has been proposed using sliding mode control by defining a new formulation for sliding surface which is based on increment conductance (INC) method. The stability and robustness of the proposed controller are investigated to load variations and environment changes. Three different types of DC-DC converter are used in Maximum Power Point (MPP) system and the results obtained are given. The simulation results confirm the effectiveness of the proposed method in the presence of load variations and environment changes for different types of DC-DC converter topologies. Maximum Power Point Tracking,MPPT,Photovoltaic Array,Solar Cell,Sliding Mode Control,SMC, 189 196 http://ijeee.iust.ac.ir/browse.php?a_code=A-10-712-1&slc_lang=en&sid=1 J. Ghazanfari jaber.gh64@gmail.com 180031947532846002953 180031947532846002953 No Electrical Engineering Department, Shahid Bahonar University of Kerman M. Maghfoori Farsangi m_maghfoori@yahoo.co.uk 180031947532846002954 180031947532846002954 Yes Electrical Engineering Department, Shahid Bahonar University of Kerman