대용량 직류버스 커패시터의 고장진단을 위한 외란특성 반영의 레퍼런스 모델 개선

• Published in: 전기학회 논문지 P권, 66(4) Vol. 66P; no. 4; pp. 213 - 218
• Main Author: 이태봉(Tae-Bong Lee)
• Format: Journal Article
• Language: Korean
• Published: 대한전기학회 2017
• Subjects: 전기공학; DC-link of power converter; Fault diagnosis; Initial ESRo; Electrolytic capacitor; ESR(equivalent serises resistance)
• ISSN: 1229-800X; 2586-7792

The DC electrolytic capacitor for DC-link of power converter is widely used in various power electronic circuits and system application. Its functions include, DC Bus voltage stabilization, conduction of ripple current due to switching events, voltage smoothing, etc. Unfortunately, DC electrolytic capacitors are some of the weakest components in power electronics converters. Many papers have proposed different algorithms or diagnosis method to determinate the ESR and tan ${\delta}$ capacitance C for fault alarm system of the electrolytic capacitor. However, both ESR vary with frequency and temperature. Accurate knowledge of both parameters at the capacitors operating conditions is essential to achieve the best reference data of fault alarm. According to parameter analysis, the capacitance increases with temperature and the initial ESR decreases. Higher frequencies make the reference ESR with the initial ESRo value to decrease. Analysis results show that the proposed DC Bus electrolytic capacitor reference ESR model setting technique can be applied to advanced reference signal of capacitor diagnosis systems successfully.