Patent ID: 8743521
Filing Date: 2014-06-03
Classification: H01L,H02H,H02J,Y02E

Abstract:
1. A photovoltaic system comprising: a photovoltaic generator that comprises multiple parallel strings of series connected photovoltaic modules, the strings having a positive pole and a negative pole between which is present a predetermined string voltage over a number of series-connected photovoltaic modules; an inverter configured to be connectable on an output side to a supply grid and whose DC input is connectable to the positive pole and the negative pole; a first switching element configured to connect the positive pole to the DC input of the inverter; a second switching element configured to connect the negative pole to the DC input of the inverter; a third switching element configured to connect the positive pole and the negative pole; a measurement system configured to measure a voltage of the positive pole and/or of the negative pole with respect to ground; and a controller connectable to the measurement system, the controller, using the measured voltage, generates a first control signal for opening the first switching element and/or a second control signal for opening the second switching element and also generates a third control signal for closing the third switching element when the voltage of the positive pole exceeds a first predefined limit value or the voltage of the negative pole exceeds a second predefined limit value; wherein, substantially simultaneously with the opening of the first switching element and/or of the second switching element, a process of closing the third switching element via the third control signal is initiated.