A DC-DC converter adequate for alternative supply system applications

The proposed DC-DC system introduced in this work provides output voltage regulation and control of energy flow between a battery bank and the output DC bus. A simple structure, composed by a DC-DC converter and a battery energy storage, is able to compensate power and voltage fluctuations in supply grid and to provide protection against power outages. The proposed system operates in various modes of operation, according to load needs and supply grid limitations, and is suitable for alternative system applications. A general concept is formulated. Operating principle and theoretical analysis are described. Digital simulation and experimental results of a 1.5 kW, operating at 50 kHz are included for different modes of operation, supporting the validity of the concept.