Connecting an alternative energy source to the power grid by a DSP controlled DC/AC inverter

In times when environmental issues such as global warming and air pollution are in focus, there are more objections to the use of conventional and nuclear power stations. The use of alternative energy sources such as water turbines, solar cells and wind turbines becomes essential for producing clean energy. In this paper, a novel design of a 1 kW DC/AC inverter is presented. The inverter is versatile, allowing for the connection of any DC alternative power source such as solar cells, wind turbines, etc, to the AC grid. Therefore, in peak load times, every household can perform as a clean micro power station. The inverter is implemented as a phase shift synchronous generator and it is controlled by means of a DSP. Sampling the grid voltage makes it possible for the inverter to synchronize with the grid at a zero angle. Then the DSP synthesizes the AC voltage waveform to be shifted, with respect to the grid, with a software controllable leading angle. This configuration makes it possible to transfer the clean energy omitted by the alternative power source to the grid. Energy contribution to the grid is possible by connecting synchronous generators that have 80% efficiency. In addition, the inverter is designed for low cost and its parameters are easy to control via computer software