Pwm Boost Inverter At Var Mode In Rural Areas

Rafia Akhter::The electrical infrastructure around the world is based on AC voltage, with a few exceptions, with a voltage of 120 Volt or 230 Volt in the distribution grid. But In Rural areas where the power supply is not available, there energy demand has to fulfill by renewable energy sources like solar/wind etc. Among these two sources solar energy is preferred as it is easily available in every part of the country in the world where as wind energy is restricted to the coastal area only. On average, most of today’s grid-tie PV inverters operate an average of 6-8 hours per day. In order to increase the utilization of grid-tie PV inverters, they can be operated in reactive power compensation mode when PV power is unavailable. While injecting reactive power into the grid can be easily realized by applying the appropriate phase shift between current reference and grid voltage, the task gets more complex when PV power is not available since the inverter needs to draw power from the grid, regulate the DC bus, and inject the desired level of reactive power. The paper presents development of a utility interface solar power Inverter that converts a solar energy directly to 220 V ac in Grid / DG power supply and enables inverter to absorb little active power from grid, regulate its DC bus voltage within limits, and inject the desired level of reactive power for a Solar lighting system used in rural areas.