Tracking method and tracking device for a voltage converter for a photovoltaic system

摘要

The disclosure relates to a tracking method for a voltage transformer, in particular an inverter, of a photovoltaic system. In the method, an intermediate circuit voltage is repeatedly decreased or increased in one direction to a lower or higher voltage by voltage steps of a specified magnitude. The method is characterized in that an average rate of change of the intermediate circuit voltage in a partial time period between two voltage steps is limited by a maximum average rate of change, the maximum average rate of change being defined according to the magnitude of the intermediate circuit voltage. The disclosure further relates to a tracking device designed to perform the tracking method and to an inverter equipped with the tracking device.

主权项

1. A tracking method for a voltage converter, in particular an inverter, of a photovoltaic system, for tracking a working point of a PV generator, comprising:
changing an intermediate circuit voltage by voltage increments of a predetermined level in a direction towards a lower or a higher voltage; and limiting a mean rate of change of the intermediate circuit voltage in a subperiod between two voltage increments by a maximum mean rate of change, wherein the maximum mean rate of change is determined depending on a level of a voltage difference between the intermediate circuit voltage and a minimum required intermediate circuit voltage.