The INVESTIGATION ON GSS BASED MPPT FOR PV APPLICATION

Abstract

In many photovoltaic (PV) energy conversion systems, nonisolated DC-DC converters with high voltage
gain are desired.The PV exhibits a nonlinear power characteristicwhich greatly depends on the
environmental conditions.Hence in order to drawmaximum available power various algorithms are used
with PV voltage/current or both as an input for the maximum power point tracking (MPPT) controller. In
this paper, golden section search (GSS) based MPPT control and its application with three-level DC-DC
boost converter for MPPT are demonstrated. The nonlinear power characteristic of PV greatly depends on
the environmental conditions. Hence in order to draw maximum available power, various algorithms are
used with PV voltage/current or both as an input for the maximum power point tracking (MPPT)
controller. Non-isolated DC-DC converters with high voltage gain are desired in all photovoltaic (PV)
energy conversion systems. The three-level boost converter provides the high voltage transfer which
enables the high power PV system to work with low size inductors with high efficiency. The balancing of
the voltage across the two capacitors of the converter and MPPT is achieved using a simple duty cycle
based voltage controller. Detailed simulation of three-level DC-DC converter topology with GSS
algorithm is carried out in MATLAB/SIMULINK platform. The validation of the proposed system is
done by the experiments carried out on hardware prototype of 100 W converter with low cost
AT’mega328 controller as a core controller. The proposed system will suit as one of the solutions for PV
based generation system and will show high performance, such as a conversion efficiency of up to 94%