Development of a current source inverter for energy storage systems

摘要

The need of great scale storage systems on a large scale has driven the development of technologies like super-conducting coils and ultracapacitors. At the same time, these technologies need power electronics converters to link the load and the ac mains. This paper presents the operation and analysis of a current source converter, working as a link for an energy storage system based on superconducting coil and the electrical network. The system works on two modes, backup mode and charge mode. The converter topology and the average model are shown, in order to propose a passivity-based control strategy. Simulations and experimental results of a laboratory prototype (127 V, 60 Hz, 500 W) are presented. From the experimental results, it can be verified that the most of the theoretical results are proven, including the bidirectional flow energy through the current converter.