Digest of "New DC/DC Converter for Electrolyser Interfacing with Stand-Alone Renewable Energy System"

This paper presents findings of a R&D project targeted to the development of a galvanically isolated step-down DC/DC converter for electrolyzer integration with renewable energy systems. The presented converter with an improved control algorithm for the full-bridge active rectifier features reduced energy circulation and switching losses. The performance can be improved under wide input voltage and load variations. The advantages of the converter were verified with a 1 kW converter prototype and the test results were in full agreement with the expected waveforms. The presented steadystate operation principle and mathematical analysis of the converter based on the simulation and experimental results can be used as design guidelines for component and parameter estimation in practical applications. According to the results, the presented step-down DC/DC converter topology with a phase- shifted active rectifier could be one of the most promising candidates for high-power conversion systems due to its reduced switching losses and a wide regulation range

New DC/DC Converter for Electrolyser Interfacing with Stand-Alone Renewable Energy System

This paper presents findings of a R&D project targeted to the development of a galvanically isolated step-down DC/DC converter for electrolyzer integration with renewable energy systems. The presented converter with an improved control algorithm for the full-bridge active rectifier features reduced energy circulation and switching losses. The performance can be improved under wide input voltage and load variations. The advantages of the converter were verified with a 1 kW converter prototype and the test results were in full agreement with the expected waveforms. The presented steadystate operation principle and mathematical analysis of the converter based on the simulation and experimental results can be used as design guidelines for component and parameter estimation in practical applications

Performance Comparison of Boost and Quasi-Z-Source Converters

Voltage step-up DC/DC converters are widely used in different applications. Although well investigated, the latest versions, supplemented with an additional quasi-Z-source (qZS) network coupled with a conventional inverter allowing some new properties to be obtained, need further research. This paper presents a comparative study with the aim to obtain objective parameters and characteristics of the converters with classical architecture and with a qZS-network. The comparison is based on the boundary case between the continuous and the discontinuous current. The influence of the internal resistance of the voltage source on the converter performance is discussed