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The exponential growth of population in developing countries like India should focus on innovative technologies in the Agricultural process to meet the future crisis. One of the vital tasks is the crop yield prediction at its early stage; because it forms one of the most challenging tasks in precision agriculture as it demands a deep understanding of the growth pattern with the highly nonlinear parameters. Environmental parameters like rainfall, temperature, humidity, and management practices like fertilizers, pesticides, irrigation are very dynamic in approach and vary from field to field. In the proposed work, the data were collected from paddy fields of 28 districts in wide spectrum of Tamilnadu over a period of 18 years. The Statistical model Multi Linear Regression was used as a benchmark for crop yield prediction, which yielded an accuracy of 82% owing to its wide ranging input data. Therefore, machine learning models are developed to obtain improved accuracy, namely Back Propagation Neural Network (BPNN), Support Vector Machine, and General Regression Neural Networks with the given data set. Results show that GRNN has greater accuracy of 97% (R 2 = 0.97) with a normalized mean square error (NMSE) of 0.03. Hence GRNN can be used for crop yield prediction in diversified geographical fields.

This paper Presents Simulation study of Dynamic Voltage Restorer based on Photovoltaic system. A Photovoltaic based DVR is used to mitigate the problems of voltage sag and swell. The Maximum Power Point Tracking Algorithm and DC-DC converter is used to extract maximum power from the Photovoltaic system. A Hysteresis based Control strategy is adopted for switching the voltage source Inverter of DVR. Perturb and Observation method is used as MPPT algorithm. When the grid is in normal operation DVR works for reducing the problems of voltage sag and swell, when the grid fails DVR works as Uninterrupted power supply(UPS) The proposed system is simulated in MATLAB/SIMULINK and the simulation results show that the proposed PV based DVR can efficiently reduce the problems of Voltage sags and swells.

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