Low power solar system grid-tied with MPPT based on temperature compensation

This paper presents a power converter for grid connection of renewable energy sources, consisting of a ZETA converter associated with a bridge inverter operating at low frequency. The Zeta converter, operating in the discontinuous conduction mode (DCM), produces a rectified sinusoidal current waveform synchronized with the electric grid. The full-bridge inverter, connected to the output of the Zeta converter, is to reverse every 180° the current generated by the Zeta converter. A low cost MPPT based on the linearization of PV panels characteristics and temperature compensation is presented. An analysis of the Zeta converter operating in DCM is presented with converter design considerations, followed by the control strategy and experimental results for a 100 Wp PV system.