TY - GEN
T1 - Condition Monitoring of DC-Link Capacitors of Three-Level NPC Inverters Based on Charge-Discharge Time
AU - Min, Kyu Jin
AU - Choi, Ui Min
N1 - Publisher Copyright:
© 2025 IEEE.
PY - 2025
Y1 - 2025
N2 - This paper proposes a condition monitoring (CM) method for DC-link capacitors of three-level NPC inverters. Since the degradation of capacitors is indicated by a decrease in their capacitance value, in the proposed CM method, the capacitance of DC-link capacitors is determined based on the charge and discharge time of the upper and lower DC-link capacitors to reach a specified voltage difference between two capacitors. However, the voltage difference between two DC-link capacitors leads to the distortion in output currents. Thus, a strategy to compensate for the distortion of the output currents is also proposed. The proposed CM method can be applied in normal operating conditions without additional hardware. The validity and effectiveness of the proposed CM method are verified by simulations and experiments.
AB - This paper proposes a condition monitoring (CM) method for DC-link capacitors of three-level NPC inverters. Since the degradation of capacitors is indicated by a decrease in their capacitance value, in the proposed CM method, the capacitance of DC-link capacitors is determined based on the charge and discharge time of the upper and lower DC-link capacitors to reach a specified voltage difference between two capacitors. However, the voltage difference between two DC-link capacitors leads to the distortion in output currents. Thus, a strategy to compensate for the distortion of the output currents is also proposed. The proposed CM method can be applied in normal operating conditions without additional hardware. The validity and effectiveness of the proposed CM method are verified by simulations and experiments.
KW - DC-link capacitor
KW - capacitance estimation
KW - charge-discharge
KW - condition monitoring
UR - https://www.scopus.com/pages/publications/105030338075
U2 - 10.1109/ECCE58356.2025.11260361
DO - 10.1109/ECCE58356.2025.11260361
M3 - Conference contribution
AN - SCOPUS:105030338075
T3 - 2025 IEEE Energy Conversion Conference Congress and Exposition, ECCE 2025
BT - 2025 IEEE Energy Conversion Conference Congress and Exposition, ECCE 2025
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 17th Annual IEEE Energy Conversion Conference Congress and Exposition, ECCE 2025
Y2 - 19 October 2025 through 23 October 2025
ER -