Yogesh K. Chauhan

Maximum power generation from solar modules is adversely affected by partial shading conditions. To strengthen and obtain feasible output under any complex shadings, a new double diode model with deterioration factor (DDM-DF) is proposed for the optimal selection of shading patterns. It is used to validate the effectiveness of the novel heuristic approach called time-distance-constrained topology (D-CT). The novel D-CT is compared with conventional techniques (bridge link (BL), series-parallel (S-P), total cross-tied (TCT)), conventional puzzles (sudoku (SDK), magic-square (M-SP)), and recently reconfigured techniques (permutation-combination (PCR), knight-tour (KTR)). In this paper, the experimental study validates the outcomes obtained by MATLAB/SIMULINK results under various realistic shadings. Experimental results prove that the novel proposed D-CT enhances the efficiency by 5.45%, 3.57%, and 3.54% over TCT, PCR, and KTR under inverted-L shading. Further, the minimum and maximum mismatch loss reduced by the proposed D-CT is up to 1.90% and 97.61% under top shading against SDK and S-P respectively. The real-time validation for the proposed novel 4×4 D-CT under pi and diagonal shading exhibits greater performance parameter enhancement of a solar array subjected to shadings in correlation with other models.

The presented work in this paper deals with various step sizes used in incremental conductance (INC) related to the maximum power point tracking (MPPT) technique. In the solar photovoltaic system, the variable step size selection method for INC is proposed and compared. The MATLAB/Simulink and hardware setup are used for assessing and analyzing step size methods. The variable step size (DVS), fixed step size (DFS) are comprehensively studied and compared. This DVS method is having a lower ON delay time $\left ({{T_{d_{ON}}} }\right)$ as 148 msec as regard to 164 msec in the DFS method. On the other hand, the lowest peak-peak oscillations in load current as 0.04 amp for DVS as compared to 0.5A for the DFS method, lower peak current as 1.96A for DVS as compare to 2.37A for the DFS method. In this way, the performance of the DVS method is found superior as it is analyzed and compared with the DFS algorithm.

Performance of the controller in adaptation mechanism of speed estimators designed on the basis of model reference adaptive system (MRAS) scheme, plays very vital role. In this paper, a fuzzy logic controller (FLC) is proposed for the adaptation mechanism of speed estimators to be used in induction motor drive. Performance of the proposed FLC is evaluated for two diverse topologies of MRAS speed estimators, namely stator current (SC) type and the rotor flux (RF) type. The drive performance is investigated with speed estimator for closed loop operation on various working conditions.

This paper proposes numerous maximum power point tracking technique (MPPT) for photo-voltaic energy conservation system. A PV system generates power which depends upon the operating voltage. Some of the MPPT techniques are explained here. The MPPT Techniques find its application in the PV system tomaximize the power output by following the path for achieving maximum power at certain irradiances. To correct the conversion energy efficiencyit is required that the PV system should work at the maximum power point.Some optimization techniques have also been discussed in this paper.

In this paper a new approach of generating the Pulse width modulation (PWM) signals which are to be used in various power electronics application like power converters and inverters is presented. Pulse Width Modulation (PWM) triggers the gate terminals of the power electronic semiconductor devices like thyristors, Insulated-Gate Bipolar Transistors (IGBTS), Metal Oxide Semiconductor Field Effect Transistors (MOSFET) etc. which are used as switches for voltage regulation. The pulses are generated using hardware description language (HDL) which is suitable for usage in Spartan-3E Field Programmable Gate Array (FPGA) board which is used as high performance controller in vector control of induction motor. Simulation is done in Model Sim 6.2b environment and results are obtained validated with register transfer level (RTL) schematic.

In this paper; the effect of partial shading on series parallel (SP) and total-cross-tied (TCT) PV module configurations has been investigated. For this study; two PV modules (4×4 size) of SP and TCT configurations have been assembled using commercially available PV cells. The analysis has been done under two moving partial shading patterns i.e. horizontal and diagonal at constant environmental conditions. The results are compared for both the considered PV module configurations in terms of I-V characteristics. From the obtained results; it can be concluded that TCT PV module provide better performance and efficiency under partial shading. Moreover; current losses; fill factor and efficiency are also calculated to validate SP and TCT configured PV module performances under shading patterns.