Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title Fault Diagnosis for 3-Phase Diode Rectifier using Harmonic Ripples of DC Link Voltage
Authors Je-Wook Park ; Seong-Won Baek ; Jang-Mok Kim ; 李Dong-Choon Lee ; 李Kyo-Beum Lee
DOI 10.6113/TKPE/2011.16.5.457
Page pp.457-465
ISSN 1229-2214
Keywords Three phase diode rectifier; Earth fault; Open circuit fault; DC link voltage
Abstract The fault analysis and detecting algorithm for a 3 phase diode rectifier is proposed. The 3 phase diode rectifier is used for the AC power rectifier of the PWM inverter. The input power or diode faults cause the ripples of the DC voltage, degradation of the control performance and life shortening of the DC link capacitor. In this paper, the ripple of the DC voltage is mathematically analyzed for the earth fault of input power and open circuit fault of the diode, respectively. The fault detection and type of fault can be obtained by comparing the average DC voltage and the instant DC voltage which is sampled with 6 times of grid frequency. The proposed method can be easily applicable and doesn't require additional circuit. The experimental and simulation results are presented to verify the validity of the proposed method.