부산대학교 도서관

Power system consist of large number of nonlinear load which causes power quality issues. Sensitive components like electronic devices, medical equipment working on power supply are vulnerable to power quality problems. Voltage sag, Swell, harmonics, noise are considered to be some important power quality issues. Voltage dips are the major disturbance affecting the power system. On load tap changers can be used to compensate voltage dip but it is not economical. Dynamic voltage restorer (DVR) is an alternate to conventional method of compensating the voltage. These are custom power devices. The main applications of DVR is to protect sensitive loads that are severely affected by fluctuations in system voltage.