Metro is integral to the urban rail transit with the expansion of the city. Due to the tremendous power consuming of the traction load which is generally considered to be megawatt class, the attendant problems concerning energy-saving and emission-reduction cannot be neglected. An approach wherein the photovoltaic plants are connected into the metro traction power supply system to provide electrical energy is proposed in this paper. Given the deterioration of power quality brought about by PV connection, the photovoltaic inverter adopts output reactive power control method.

This work introduces a development of scrolling LED notice board with self-generating power from built in solar panel for its working. The main advantage of the project is to get a major reduction in paper consumption and manpower. The messages can also be passed immediately without any delay. Scrolling LED display is used as it is low power and low cost. The led Display System is aimed at the colleges and universities for displaying day-to-day information continuously or at regular intervals during the working hours.