Method and device for calibrating a time base signal in a photovoltaic inverter

A photovoltaic inverter comprising:

• a conversion circuit comprising electronic components which convert a direct current received into an alternating current;
• a time signal generator configured to generate a time base signal comprising a clock signal;
• a receiving unit provided for receiving a reference signal from an external reference signal source;
• a calibration unit which receives the time base signal from the time signal generator and which is configured and operable to automatically correct the time base signal on the basis of the reference signal received by the receiving unit, or calculates a correction factor,
• wherein the calibration unit automatically corrects the time base signal generated by the time signal generator depending on the reference signal in case the reference signal is available, and
• wherein the calibration unit automatically corrects the time base signal received from the time signal generator, in case the reference signal is temporarily unavailable, depending on at least one operating parameter stored in a data storage of the photovoltaic inverter, the at least one operating parameter being formed by an internal temperature inside the housing of the photovoltaic inverter and/or by a measured supply voltage;
• and
• a control unit configured and operable to adjust one or more nominal values for a regulating unit of the conversion circuit of the photovoltaic inverter depending on the corrected time base signal or the calculated correction factor.