Dinesh Sharma | Sir Padampat Singhania University (original) (raw)

Papers by Dinesh Sharma

Journal of Energy in Southern Africa, 2017

We report on an improved maximum power point tracking (MPPT) system based on a differential power... more We report on an improved maximum power point tracking (MPPT) system based on a differential power algorithm. In the proposed algorithm, which is a modified form of a perturb and observe (P&O) algorithm, differential powers, as well as voltages at different time, are compared. The proposed algorithm has been implemented with a highly efficient boost converter, in which duty cycle of a switch is varied in such a way, that the power reaches a maximum at any instant of the day, irrespective of the environmental conditions. The improved MPPT is able to reduce the number of oscillations and tracking time significantly before reaching the maximum power point (MPP). The simulated I-V and P-V characteristic curves (individual and combined) of a solar PV module were generated in MATLAB.

Arabian Journal for Science and Engineering, 2014

Article, Sep 16, 2014

A novel maximum power angle (MPA) based maximum power point tracking (MPPT) technique is reported... more A novel maximum power angle (MPA) based maximum power point tracking (MPPT) technique is reported. In this
technique, a graphical and mathematical approach based maximum power angle determination mechanism is adopted. On the I-V characteristic curve, the angle made from the intersection point of open circuit voltage (VOC) and short circuit current (ISC) with respect to the voltage (V) axis to the point of maximum power (MPP) is determined using the known parameters of the solar PV module. The proposed MPPT technique is able to minimize the dependency on various voltage and current sensor requirements, thereby the reduced requirement of hardware components. Due to this fact, the implementation cost of this technique is expected low and maintenance needs of such technique based MPPT system would be also minimized.

Chapter, Jun 30, 2014

Solar energy utilization is the most important energy resource for bridging the gap between deman... more Solar energy utilization is the most important energy resource for bridging the gap between demand and supply of various energy needs in urban and peri-urban areas. The energy consumption is basically in terms of electricity (for many appliances and equipment in homes), thermal energy (for heating and cooling in homes) and passive solar architecture for energy efficient buildings. On the other hand, the conventional energy consumption also induces the ecological imbalance such as the generation of greenhouse gases. Therefore solar energy may be considered as an environment-friendly alternative energy source for sustainable development. In this chapter, different active and passive solar energy harnessing techniques have been discussed, analyzed and recommended leading to zero energy buildings in urban and peri-urban areas. Here the study of solar energy applications for all types of energy needs in a residential building for advanced, ecological and smart livability is presented. In this chapter, we suggest some effective ways to harvest solar energy in urban and peri-urban areas using active and passive solar techniques.

Article, Mar 10, 2014

Background: The efficiency of solar PV power generating system is the most important parameter ... more Background:
The efficiency of solar PV power generating system is the most
important parameter which can be maximized by using an effective Maximum Power
Point Tracking (MPPT) technique. F
or an effective MPPT, an efficient control method
(algorithm) is required to efficiently control the operation of MPPT. By using an
efficient control algorithm, the wastage of power in tracking the maximum power
points (MPPs) and the oscillations of operat
ing point around MPP are reduced.
Different variants of characteristic curves (simulated in MATLAB) of solar PV module
are presented. Performance parameters of some of the mostly used MPPT control
algorithms are summarized.
Objective:
to maximize the effic
iency of solar PV power
generating system by improving the tracking speed of MPPs and hence reducing the
wastage of power by using proposed hybrid control method.
Results:
It is observed that
simulated results of proposed control algorithm show the improve
d convergence speed
of output power and hence higher tracking efficiency. The proposed method has been
simulated in MATLAB/SIMULINK environment. The result show the reduced time to
track the MPPs due to faster convergence speed.
Conclusion:
We have reporte
d the
hybrid control method for an improved Maximum Power Point Tracking (MPPT)
technique. The proposed hybrid control method is realized using two classical MPPT
methods viz. mostly used Perturb and Observe (P&O) method and Constant Voltage
(CV) method fo
r better performance of improved MPPT and maximized efficiency of
solar PV system. The main requirement for this method is the information about the
Voc and Vmp to implement the CV method after P&O method. The easier
implementation of P&O method allows com
bining it with constant voltage method. The
constant voltage method works on the fact that ratio of maximum power voltage and
open circuit voltage is constant (i.e. VMP / VOC = constant) and usually optimal value
of this constant is equals to 0.76. The con
stant voltage method works more effectively
than the P&O and Incremental Conductance (INC) method when solar PV panels are in
low insolation. In this proposed hybrid algorithm, the converter is provided with the
voltage closer to MPP which is a predetermin
ed fraction of VOC. Using the proposed
algorithm, the operation (duty cycle) of boost converter is controlled to optimally
operate the MPPT. Consequently the oscillations of MPP around the operating point are
minimized and efficiency of the overall solar
PV power generating system is
maximized.

Proceedings of International Conference on Advances in Energy Research (ICAER 2013), Indian Institute of Technology, Bombay (IITB), Dec 10, 2013

In this paper, a fill factor based new approach for maximization of efficiency of solar PV system... more In this paper, a fill factor based new approach for maximization of efficiency of solar PV system is investigated using modified MPPT technique. On the I-V characteristic curve of solar PV module, fill factor is one of the most important parameter for determining and tracking the maximum power points (MPPs) throughout the day. In the proposed technique, the area under the I-V curve is to be optimized .for a fill factor value of 1.The fill factor having a value 1 represents the maximum possible efficiency of a solar PV module yields .The present technique may be considered as the modified version of the constant voltage method for MPPT. Apart from the mathematical description of the proposed technique, the simulated curves of I-V and P-V characteristics (with MPP) of solar PV module are presented. The proposed MPPT technique has many features over the existing MPPTs like reduced sensor requirement, direct determination of MPP, reduced tracking time, maximized efficiency and cost effectiveness.

… (IICPE), 2012 IEEE 5th India …, 2012

In this paper, a novel algorithm based MPPT has been suggested for extracting maximum possible po... more In this paper, a novel algorithm based MPPT has been suggested for extracting maximum possible power from PV module. The proposed algorithm for controlling the MPPT is based upon the mostly used Perturb and Observe (P&O) method. Along with the proposed algorithm, different existing algorithms have been compared in terms of their tracking speed and implementation complexity. The solar module characteristics (I-V and P-V) have been simulated in MATLAB. The simulation results for various parameters of boost converter have also been obtained. In this paper, we discuss the results of our study of an improved maximum power point tracker (MPPT) of a PV system. The proposed MPPT algorithm is based on the incremental perturbation and observation (IP&O) strategy in which the perturbation steps have been increased to get closer to the maximum power point with minimum possible oscillations. The PV power system, using the proposed MPPT, will be able to optimally track maximum power points with minimum possible oscillation around maximum power points (MPPs). Consequently the light to electricity conversion efficiency can be improved significantly.