Mohammed Aslam Husain

Simulation and study of a grid connected multilevel converter (MLC) with varying DC input

Multilevel line commutated inverters for renewable energy systems have gained popularity in recent times, especially in the distributed generation where a number of batteries, fuel cells, solar cell, and micro-turbines can be connected through a MLC to feed the grid. They can synthesize higher output voltage levels and can generate near sinusoidal voltages. This paper presents analysis of a grid connected MLC as an inverter having variable dc sources(which can be the output of wind farms, solar panels etc.). A Computer simulation analysis using SIMULINK/ MATLAB has been done to minimize total harmonic distortion (THD) by increasing the stages and by varying the delay angles for varying dc input to the multilevel inverter. A comparative study of different stages of MLC for different value of dc input has also been studied. The results has been tabulated and discussed.

A novel fast mutable duty (FMD) MPPT technique for solar PV system with reduced searching area

In this paper, a novel maximum power point (MPP) tracking technique for photovoltaic system (PV) with fast convergence speed and reduced range for the MPP search operation is presented. The characteristic of this method is the limited searching area/range for the tracking. The adaptable variable duty step used in the proposed method instantaneously brings the operating point close to the MPP, thus bounding the searching area. The value of duty gets updated according to the panel temperature and irradiance, and the operating point always remains close to the MPP. By bounding the search operation, the overall tracking speed and efficiency of the tracking increase. Further enhancement of the tracking speed is obtained by varying the step size of duty ratio of the DC-DC converter used; this is done in such a manner that the size of variable duty step is large for the points far away from MPP and becomes very small at or near MPP. The projected tracking algorithm is compared with conventional Perturb and Obser...

Hardware Implementation of Perturb and Observe Maximum Power Point Tracking Algorithm for Solar Photovoltaic System

Solar photovoltaic systems have evolved as a prominent renewable source of energy owing to its eco-friendly nature, long lifetime, and low maintenance requirement. However, its conversion efficiency is very low. Different maximum power point tracking (MPPT) techniques have been used to extract maximum power from the photovoltaic system. In this study, the perturb and observe (P&O) MPPT algorithm, which is practically implemented on an Arduino Uno board and simulated in Matlab/Simulink under the same environmental conditions, is used to track the maximum power. Different parameters of a Simulink-based PV module and a practical photovoltaic module are obtained and compared. The main advantages of the P&O MPPT algorithm are its low cost and easy implementation. However, it may fail to track the maximum operating point under varying environmental conditions.

Aspects Involved in the Modeling of PV System, Comparison of MPPT Schemes, and Study of Different Ambient Conditions Using P&O Method

Discussion of almost all major aspects involved in the study and design of a solar photovoltaic (PV) stand-alone system has been incorporated in this paper. Detailed modeling of a photovoltaic cell and maximum power point tracker in MATLAB/Simulink environment has been shown. Initially, the precise model of a solar cell is made in Simulink, and then, how a solar module, array, and panel are obtained using that cell is shown clearly. All the existing methods for maximum power point method of solar PV power have been tabulated, and a comparative table is included in this article. Finally, a detailed study of the PV system with perturbation and observation MPPT method has been done.

Realisation of incremental conductance the MPPT algorithm for a solar photovoltaic system

ABSTRACT This paper presents the modelling, simulation and hardware implementation of the incremental conductance (INC) maximum power point tracking (MPPT) algorithm. The extraction of maximum power from the solar photovoltaic system was made by integrating the PV module with a DC–DC converter and utilising the MPPT algorithm. In this work, the INC MPPT algorithm is practically implemented on an Arduino Uno board to track the maximum power point (MPP) and also simulated in Matlab/Simulink under the same environmental conditions. The performance of the INC algorithm was also compared with the conventional Perturb and Observe (P&O) MPPT algorithm. The experimental and simulation results are provided for both MPPT techniques. Matlab/Simulink was used for simulation studies.

Transient analysis and selection of perturbation parameters for PV-MPPT implementation

ABSTRACT In this article, system dynamics of a complete photovoltaic system have been studied. A small signal transient analysis model has been established to examine the effects of small change in the duty cycle of the converter as well as the time steps between each perturbation on the system dynamics. All efforts have been made to do a detailed analysis using almost all the equations involved. Sample calculations (using the simulated system model) are also shown so as to approximately analyse the perturbation effects. It is shown that the value of the step size of the duty cycle should be taken large for points far away from the maximum power point (MPP) and small for points near the MPP. Also, the time between two consecutive perturbations should be at least equal to the settling time. This article is very useful for the researchers to choose a proper delay between two consecutive perturbations and selection of the optimum value of the step size.

A novel fast and accurate temperature tolerant PV Maximum Power Point tracking system

This paper presents a technique in determining the Maximum Power Output Point of the PV Panel under different Load, Temperature and Radiation Conditions. The technique is fast and precise for obtaining the Maximum Power Output of the PV Panel under sudden changes in Temperature and Irradiation conditions. The system uses the characteristics of the PV Panel for determining the effective load value across the panel for Maximum Power Output and adjusting it with the help of a Boost Converter to make the Panel work near the Maximum Power Point in changing conditions.