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The present paper focuses on the use of the Multilevel Current Rectifier topology as an interconnection element between PV systems and the network or loads. In order to properly use the converter in connection with the PV system, several subjects such as the compatibility with the maximum power point tracking and the compatibility between the converter and the PV array must be taken into account. Compatibility between the converter and the PV array can be achieved by ensuring at least the maximum power point is a point that the converter can work with. In this sense, this work focuses on the operating conditions to guarantee the compatibility with the PV array. The main results are an analytical and experimental characterization of the operating range of the system using the Multilevel Current Rectifier. This operating range has a precision of 1 % . Leading to the conclution that not only the converter is a viable option, but also that the theory and methodology used can be extrapolated to another topologies.

Current Source Converters (CSC) have specific applications fields like electrolysis processes, induction furnaces, link for Super Magnetic Energy Storage and network support under fault-conditions. Many other applications such as the connection of renewable energy sources to the grid and active power filters could benefit from the CSC properties. The converter discussed in this paper is the Current Multilevel Rectifier (CMR) topology with a modular structure, and the aim is to present a study and methodology to ease the use of the CMR converter. Therefore, the study presents the component sizing for the converter, the equations that describe the behavior of the system under restricted operation area, and a control strategy based on passivity techniques is proposed.

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.