Abstract:
This paper presents implementation of a maximum
power point (MPP) tracking system with a novel algorithm to
track the global MPP (GMPP) of solar PV system under partial
shading conditions. Due to partial shading caused by clouds,
trees and buildings on the solar panel, MPP tracking algorithm
becomes more complex because of the presence of multiple peaks
in the power- voltage characteristics. When PV array is uniformly
illuminated there is only one MPP, while in the partial shading
conditions multiple MPPs formed. Many algorithms track the
local MPP(LMPP) instead of global MPP (GMPP) and this cause
PV system to become low efficient. Therefore, a novel algorithm
based on Perturb and Observe (P&O) technique is proposed.
Algorithm consists of two main parts, scanning of power voltage
characteristics for the maximum power among power values
at some defined voltages, and P&O algorithm is run near the
maximum power to track the exact GMPP. The proposed method
was validated in a simulation study and an experimental study.
From the experimental results 84.90% MPP tracking efficiency
has realized.
