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In the present-day scenario of the scarcity of freshwater, the rainwater harvesting system is one of the most feasible and viable options to overcome the crisis. In this study, a filtration system has been proposed using pulsed corona discharge technique. At the time of water purification with the help of pulsed corona discharge (PCD) technique, the water is allowed to run into a reactor where the atmospheric air or oxygen is available, and simultaneously, a short duration high voltage pulse creates a corona discharge. This process can be used to degrade dissolved chemical compounds and biological cells in water. The primary product is ozone by which the electrical discharge over the water surface occurs in the oxygen environment or in the air. When the electrical discharge occurs near the water surface, it forms OH· and O· radicals. The reaction product of OH· and O· radicals (\({\text{O}}_{3} , {\text{H}}_{2} {\text{O}}_{2}\)) created in the liquid–gas interface or in the gas phase can dissolve into the water, which helps to degrade the organic compound via an oxidation process. After purification, the water passes through a pH meter to verify whether the water is drinkable or not. The present work deals with a noble proposal to implement the use of PCD, and it endeavors to develop a solar PV-fed filtration system for off-grid application.

Present work deals with the design of a wireless charging unit for electric vehicles. The design is predominantly concentrated on LCL topology for transmission side and dynamic LCL or series (S)-based switching topology for (vehicle side) receiver unit. This charging unit can charge the electric vehicle in both constant current and constant voltage charging modes. A sinusoidal pulse width modulation technique-based inverter unit is integrated, and resonant compensation network is optimally designed for wireless power transmission. This work is specified for coupling between two different-sized highly inductive coils in transmission and receiving sides to compensate misalignment between coils due to parking error which degrades the efficiency of charging. Moreover, the system can transfer a variable amount of power efficiently up to several kilowatts. Finally, the designed wireless charging system is simulated and tested. The simulated results manifest the specified characteristics and objectives are partially correlated well with theoretical explanations.

The output of solar photovoltaic (SPV) array mainly depends on solar radiation received on the surface of the array and the temperature of the cell. Both radiation and temperature vary throughout the day. Therefore, performance analysis of the SPV system is very essential for technical and economical point of view. This paper evaluates the performance indices of 1 kW SPV system for the rural area. A simulation model has been developed for evaluating cell temperature, power output, DC energy, AC energy, energy yield (reference yield, array yield and final yield), losses (array capture loss and system loss), performance ratio and capacity factors based on climatological data as per IEC 61724 guidelines. The annual averaged value of performance ratio and capacity factor has been found as 67.5% and 13.8% for Ramnagar block of West Champaran district, Bihar.

The adoption of an efficient approach for tuning inertia weight is one of the most effective methods of improving the performance of particle swarm optimization (PSO). Recently, the introduction of the modulation index in the nonlinearly decreasing inertia weight enhances the convergence characteristics of PSO. Economic load dispatch (ELD) is a famous optimization problem, and it is effectively solved by PSO with certain advantages. In this paper, influences of modulation index on PSO have been presented for ELD problem of IEEE 5, 14, and 30 bus systems. The minimum, maximum, average, and standard deviation of generation cost, average power loss, average iteration, and average computational time of 20 trial runs for ten different values of modulation index are computed using MATLAB program. The simulation results conclude that the value of modulation index 0.8, 0.4, and 1.8 provides high-quality solutions for IEEE 5, 14, and 30 bus systems, respectively.

There is energy scarcity in rural India. Energy generation and transmission is very challenging area in today’s scenario energy supply in isolated rural areas by using small-scale power generation is found to be inexpensive and convenient alternative of grid utility. Under the present work, a systematic method has been established to develop a stand-alone renewable energy-based hybrid system for rural areas. In the stand-alone mode, energy supply to rural households can be achieved by single renewable energy technology or combinations of different available energy sources. Further, various criterions and parameters used for designing a hybrid energy system are discussed in detail. Different criterion includes economic, technical, power reliability, social aspects, and environmental aspects related to the hybrid system. Various challenges that deviates the development of the system are also discussed in the paper.