Protection device and method for distributed energy resources in electric distribution system

摘要

According to an embodiment of the present invention, a measurement unit for collecting voltage, current, frequency, phase and active power information of a low voltage or a high voltage side associated with a distributed power supply; A calculation unit for calculating a frequency change amount, a voltage magnitude change amount, a phase change amount, and a harmonic distortion (THD) using the collected information; When at least one of the amount of change in frequency, the amount of change in voltage, the amount of change in phase, and the distortion of the harmonic exceeds a maximum set value for each, it is determined as a distributed power supply single operation situation, and the amount of change in frequency, the amount of change in voltage, and the Provided is a distributed power supply protection device including a determination unit that determines whether at least one of the phase change amount and the harmonic distortion is below a maximum setting value for each, and exceeds a minimum setting value, as a suspected situation of distributed power supply single operation. .