This paper studies the problem about the energy deviation registered in kWh-meters (smart meters) when photovoltaic (PV) systems are connected in the installation. First of all, the field measurement at consumer's premise side was carried out. The high frequency disturbing current from (PV) system was detected. Then, in simulation experiment, the high frequency disturbing current was injected in to smart meter MT382 to check the deviation. According to the simulation result, the high frequency disturbing current can make the output signal of the Rogowsky coil beyond the dynamic range of the smart meter. It leads to fundamental current reduction and sequentially less registered energy.