PERFORMANCE ANALYSIS OF MODIFIED MPPT TECHNIQUES FOR PV PUMPING SYSTEMS
P.MARISH KUMAR Dr.C. SHARMEELA S. AMOSEDINAKARAN S. LOKESH Dr.C. VIMALARANI
The output I-V (current-voltage) characteristics of Photovoltaic (PV) system depends on the solar irradiation, ambient temperature and load impedance, hence its maximum power point (MPP) is not constant. As MPP is produced under each condition or stage of PV module, a Maximum Power Point Tracking (MPPT) technique is required to uphold the PV panel operating at its MPP. The conventional Maximum power Point Tracking (MPPT) control methods will fail to work as the I-V characteristics curve of PV system shows multiple peaks under partially shaded conditions. Particle Swarm Optimization control Techniques is more suitable to solve the multi-extreme optimization problem under those conditions. This paper presents comparative study between the MPPT methods used in PV systems: Modified Perturb and Observe (MP&O), Modified Incremental Conductance (MIC) and Modified Particle Swarm Optimization (MPSO) techniques of MPPT of PV system. To evaluate the study, the MPSO MPPT is implemented on a DC-DC converter and has been compared with MP&O and MIC in-terms of their tracking speed, accuracy and performance by using the MATLAB tool, simulink The simulation results show that the proposed algorithm is simple and is efficient when compared to the MP&O and MIC methods. Experimental results obtained using a KC200GTW PV array connected to a SPM200W permanent DC motor-centrifugal pump set shows very good agreement with the numerical simulation of the system.
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