Large input-voltage range DC-DC converter for high-efficiency PV applications

Abstract

It is known that, the energy extracted from photovoltaic (PV) panels oscillates in magnitude during the light-day interval. In addition, an ideal location of PV systems involves the awareness of solar supply characteristics in order to establish a better use of this resource. In the solar energy systems this solar irradiance variation is partially engaged, limiting the converter's transformation rate for a certain input amount and leaving the rest of energy unconverted. This lends a restricted use of photovoltaic panel's energy capability. In order to utilize at its maximum the energy provided from a PV system, this manuscript proposes a topology that can cope with marginal input voltage variations from 60VDC up to 1050VDC for a steady output voltage of 700VDC. This output voltage value is suitable for any interlink post-regulation architecture. Based on previous observations, this paper presents a wide-input voltage high-efficiency non-isolated single-control topology. Analysis, operating stages and experimental results for a 3kW prototype are presented.