An Improved GMPPT Technique Under Partial Shading Conditions for PV Array

PV solar is widely establishing technology which is considered as a promising source to replace the conventional technologies. But it has limited usage due to its limitations such as low efficiency, invariable nature etc. The efficiency of PV array is affected by one such factor that is called as partial shading condition. This partial shading condition is a state in which all the PV panels do not receive uniform irradiation and this leads to complex P-V characteristics. In such characteristics, there is only one global power peak and other are local power peaks. The presence of multiple peaks in partial shading condition on P-V curve make the conventional MPPT techniques such as Perturb and Observe, Incremental conductance etc ineffective. Thus, an improved global maximum power point tracking (GMPPT) technique is proposed which is used for detecting the global peak. This uses the hill climbing technique in modified form. This proposed technique will detect the global peak and thus will deliver maximum possible output during partial shading condition.