Performance enhancement of maximum power point tracking for grid-connected photovoltaic system under various gradient of irradiance changes

Abstract

This paper presents a new variant of smart adaptive algorithm of Maximum Power Point Tracking (MPPT) in the photovoltaic (PV) system. The algorithm was adopted from Modified Perturb and Observe (MP&O). The smart adaptive MPPT is used to search Maximum Power Point (MPP) of the PV system under various irradiance changes. This algorithm incorporates information of current change (ΔI), maximum operating point margin and dynamic perturbation step to prevent MPPT diverging away from the MPP and minimize the steady state oscillation. The smart adaptive MPPT algorithm performance is compared with the dI-P&O and conventional P&O to prove its effectiveness. The comparison is performed under the various gradient of irradiance change. It was found that, for all the tests, the smart adaptive algorithm scheme improve the tracking efficiency under various gradients of irradiance changes and increase the efficiency of extraction power from PV system.

A robust maximum power point tracking control for PV panel using adaptive PI controller based on fuzzy logic

“…Several articles on direct MPPT control method have been published i.e. perturb and observe (PO) [4,5], modified PO [6], IC [4,5,7,8], incremental resistance (IR) [9], cuckoo search algorithm (CSA) [10], ICM with fuzzy logic [11], FLC [12][13][14][15][16][17][18][19][20], adaptive FLC based on two layers FLC [21], FLC using auto scaling variable step-size [22], and constant PID control [15,16]. Genetic algorithm (GA) is used to optimize constant proportional-integral (PI) control [23], Ant colony algorithm (ACO) is utilized for optimizing constant PI control [24], gradient descend method is adopted for PID control optimization [25], FLC is used for adaptive PID control [26,27], adaptive scaling factor is used for fuzzy gain scheduling (FGS) PID control [28], and Big Bang-Big Crunch (BB-BC) algorithm is used to tune a fuzzy PID controller [29].…”

Grid tied PV System using modular multilevel inverter

“…Due to the intermittent nature of the PV array, power electronic interface is needed in the standalone and grid tied PV systems for obtaining the desired output [4]. For grid tied PV system, power electronic inverters are utilized as the interface to convert the generated dc power from the PV array into ac power to feed the utility grid [5][6][7][8][9].…”