Dynamics of current-fed converters and stability-assessment of solar-generator interfacing

Large-scale harvesting of solar energy is an important action to decelerate the observed climate changes and ensuring the availability of energy also in the future. It has been observed that the maximum-power-point (MPP) tracking converters have high contribution on the reliability problems in the photovoltaic energy systems because of misunderstanding of their real nature. The paper shows that most of the applied converters are current-fed converters but usually assumed to be conventional voltage-fed converters. The general dynamic properties of a current-fed converter and the method to assess the stability of an interconnected system composing of a solar generator and a MPP-tracking converter are introduced. Theoretical findings are supported with experimental evidence.