POWER QUALITY MONITORING SYSTEM AND METHOD THEREOF

PURPOSE: A power quality monitoring system and a monitoring method thereof are provided to improve speed calculation speed for evaluating the harmonic wave of an electric power system by reducing sampling data. CONSTITUTION: A power quality monitoring system(10) comprises a power measuring quality apparatus(100) and a server(200). The power measuring quality apparatus obtains a voltage waveform in a bus line and a distribution line at a preset time interval while being connected to the bus line and the distribution line of the electric power system. The power quality monitoring system samples and stores the voltage waveform and current waveform acquired at a fixed cycle. The power measuring quality apparatus superposes the voltage waveform and current waveform, which is sampled for a fixed measurement cycle, into one cycle and generates and stores a voltage representative waveform and a current representative waveform. A server monitors the abnormal occurrence of the electric power system by receiving the voltage representative waveform and the current representative waveform and decomposing a harmonic component with high speed Fourier transform.