The invention relates to a
distributed power supply grid connected alarm
system and an operating method thereof. The
distributed power supply grid connected alarm
system comprises a photovoltaic
assembly, an
inverter, a
voltage-drop release breaker, a
disconnector, a grid connected
electric energy meter, an
alarm device and an earth leakage protection breaker. The
inverter, the
voltage-drop release breaker, the grid connected
electric energy meter, the
alarm device and the earth leakage protection breaker are connected in sequence. The
voltage-drop release breaker is connected to the grid connected
electric energy meter through the
disconnector. The
alarm device comprises a master control MCU, and also an
information acquisition module, a voltage abnormity alarm module, a frequency change alarm module, a display module, an uplink communication module, a storage module and a power supply module that are connected to the master control MCU. When the
distributed power supply grid connected alarm
system is running, the earth leakage protection breaker is connected to a
power grid side, and the alarm device can send alarm information, if voltage drops or frequency changes of the
power grid side exceed a certain range, to notify management workers of checking the running condition of distributed power supply grid connected system equipment. Therefore, the safety of a
power grid, equipment and operation management workers is improved in a wider scope and to a greater extent.