METHOD AND DEVICE FOR CALIBRATING A TIME BASE SIGNAL IN A PHOTOVOLTAIC INVERTER

• Main Authors: PIELER, Roland, ANGERER, Christian, KREUZER, Harald
• Format: Patent
• Language: English; French; German
• Published: 15.05.2024
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

A method and device is provided for calibrating a time base signal in a photovoltaic inverter, which has a conversion circuit configured to convert a DC current into an AC current. The method comprises the steps of: receiving a reference signal by a receiving unit from an external reference signal source; determining a deviation between the received reference signal and a time base signal which is generated by a local time signal generator; correcting the generated time base signal to minimize the determined deviation or calculating a correction factor, wherein the calibration unit automatically corrects the time base signal obtained from the time signal generator, even when a reference signal is temporarily unavailable, depending on at least one operating parameter which is stored in a data memory and which is formed by an internal temperature inside the housing of the photovoltaic inverter and/or by a measured supply voltage; and adapting predetermined values for components of the conversion circuit depending on the corrected time base signal or depending on the calculated correction factor.