Current sensorless MPPT for PV micro-inverters

摘要

Systems, methods, and devices for use with photovoltaic micro-inverters. A control system for controlling power switches in a full bridge inverter in a DC/DC converter uses an estimate of the output current of a photovoltaic (PV) panel. The estimate is provided by a current estimator that takes as input the output voltage of the PV panel as well as the bus voltage of the DC/DC converter. Also used as input to the current estimator are two of the control signals for specific power switches in the full bridge inverter in the DC/DC converter.

主权项

1. A control system for controlling a DC/DC converter for a photovoltaic panel, the control system comprising:
a current estimator for providing an estimated output current of said photovoltaic panel, said current estimator basing said estimated output current on an output voltage of said photovoltaic panel and on a bus voltage of said DC/DC converter; a maximum power point tracker (MPPT) for producing a reference value for an output voltage of said photovoltaic panel, said MPPT receiving said estimated output current from said current estimator; an input voltage controller for producing a desired phase shift for regulating an input voltage of said DC/DC converter, said input voltage controller receiving said reference value from said MPPT; a phase-shift modulator for producing control signals for power switches in said DC/DC converter based on said desired phase shift;wherein said current estimator is based on nonlinear dynamics of said DC/DC converter.