Research and practical utilisation of low-intensity stochastic energy

Renewable energy sources generate stochastic electric power that depends on factors that vary widely. The average wind speed throughout Lithuania varies from 3.1-6.1 m/s at a height of 50 m. Low, stochastic wind energy dominates in the European Union and Lithuania. In Lithuania, the recorded hydro energy potential of 472 small rivers is approximately 585 MW of power. Range of runoff highly varies of Lithuanian small rivers. These are huge wind and hydro energy resources that low energy potential is poorly utilised because of the very complex structures of power converter systems and their low quality of converted power. The application of a dual electric system that can operate with either I = constant and U = variable or U = constant and I = variable appliance is one of the possibilities to solve renewable energy sources low-intensity stochastic energy utilisation problems. This research article presents the features of a dual electric system and the simulation schemes, research results, aspects of practical applications of the inverter - three-phase dual electric system converter with the simple control system that confirms highly effective power extraction in low and high-intensity stochastic energy.