Issues on solar-generator-interfacing with voltage-fed converter

Reliably operating solar-energy systems composing of solar arrays and their interfacing converters are of prime importance to maximize the solar-energy harvesting. The paper investigates the solar-generator-interfacing problems in terms of voltage-fed maximum-power-point tracking converters and shows that there are two main reasons for the observed stability problems of which the one is the violation of Kirchhoff´s current law governing the operation of the solar generator and the other the phenomenon known as negative resistance oscillation. In practice, this means that the voltage-fed converter can reliably operate only in the voltages higher than the maximum-powerpoint voltage. Practical evidence is provided based on a coupled-inductor superbuck converter.