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Design and integration of Z-source converters for energy management with series operation: Applied to DC microgrid

Abstract:

This paper presents a Z-source converter integration technique, with which the energy management of various renewable energy sources is achieved. With a single controller and with serial arrangement of converters, this innovative method connect in series several power sources, with different power and voltage conditions. In this way, the supply to the load can be maintained without alterations, despite the random variations that occur in renewable energy sources. The main innovation is the design of the converters, according to the power and voltage conditions of the sources, so they can be integrated into a common generation branch with a single controller for all converters. The results have been verified by building a laboratory prototype consisting of three unidirectional and two bidirectional converters, which integrate three renewable sources and two electric accumulators. The generation branch management has been implemented in an S7-1500 PLC, each converter has used a DSP TMS320F2812 for the implementation of its switching technique, the branch control has also been implemented in another DSP of the same type.