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Perturb and Observe MPPT Algorithm for Solar PV Systems-Modeling and Simulation

Perturb and Observe MPPT Algorithm.pdf (Size: 405.64 KB / Downloads: 137)

Abstract

The following paper validates an algorithm for

Maximum Power Point Tracking using Perturb and Observe

technique. The algorithm starts by setting the computed

maximum power PMAX to an initial value (usually zero).

Next the actual PV voltage and current are measured at

specific intervals and the instantaneous value of PV power,

PACT is computed. PMAX and PACT are compared.

PMAX and PACT are compared. If PACT is greater than

PMAX, it is set as the new value of PMAX. At every instant

the PACT is calculated, and the comparison is continuously

executed.

INTRODUCTION

As people are concerned with the fossil fuel exhaustion

and the environmental problems caused by the

conventional power generation schemes present,

renewable energy sources, photovoltaic panels and windgenerators,

to mention a few are now in great need [2].

Among several renewable energy sources, photovoltaic

arrays are used in many applications such as water

pumping, battery charging, hybrid vehicles, and grid

connected PV systems. The principal advantages

associated with photovoltaic arrays are that it consists of

no moving parts. Do not produce any noise and

maintenance costs are minimal. It is also a clean source of

energy. Amount of energy produced by the sun is so large.

P&O MPPT TECHNIQUE

The problem considered by MPPT methods is to

automatically find the voltage VMPP or current IMPP at

which a PV array delivers maximum power under a given

temperature and irradiance. In P&O method, the MPPT

algorithm is based on the calculation of the PV output

power and the power change by sampling both the PV

Array current and voltage. The tracker operates by

periodically incrementing or decrementing the solar array

voltage [4]. If a given perturbation leads to an increase

(decrease) in the output power of the PV, then the

subsequent perturbation is generated in the same (opposite)

direction. The duty cycle of the dc chopper is varied and

the process is repeated until the maximum power point has

been reached. Actually, the system oscillates about the

MPP. Reducing the perturbation step size can minimize the

oscillation. However.

MATLAB MODELING AND SIMULATION

The PV Array and the PVIV blocks are embedded

blocks, where the PV array has been mathematically

modelled [4]. These blocks are necessary to calculate the

maximum power point, as part of the MPPT technique and

also to display the characteristics curves based on different

irradiance levels. The same can be implemented for

different ambient temperatures.

CONCLUSION

The PV Array has been mathematically modelled. The

programmes implemented in the MPPT technique achieve

the maximum power point. It has been shown that for the

particular irradiance levels the maximum power delivered

by the PV Array is delivered to the load. The same is

carried out if there is a variation in temperature. It is a

simple MPPT setup resulting in a highly efficient system.

In conclusion, non-conventional energy sources will

dominate the conventional sources of energy in the near

future and here one uses the greatest renewable energy of

all, the sun’s energy.