[논문]NPC 인버터의 DC-link 커패시터 수명 향상을 위한 전압 변조 방법 비교 평가

최재헌; 최의민

doi:10.6113/tkpe.2022.27.4.291

[국내논문] NPC 인버터의 DC-link 커패시터 수명 향상을 위한 전압 변조 방법 비교 평가
Comparative Analysis of Pulse Width Modulation Methods for Improving the Lifetime of DC-link Capacitors of NPC Inverters 원문보기

전력전자학회 논문지 = The Transactions of the Korean Institute of Power Electronics, v.27 no.4, 2022년, pp.291 - 296

최재헌 (Dept. of IT Media Engineering, Seoul National University of Science and Technology) , 최의민 (Dept. of Electronic & IT Media Engineering, Seoul National University of Science and Technology)

Abstract ▼ AI-Helper

Capacitor is one of the reliability-critical components in power converters. The lifetime of the capacitor decreases as the operating temperature increases, and power losses caused by capacitor current are the main cause of the capacitor temperature increase. Therefore, various studies are being conducted to improve the lifetime of the capacitor by reducing the current of DC-link capacitors. In this study, pulse width modulation methods proposed for improving the lifetime of DC-link capacitors of the three-level NPC inverter are comparatively analyzed. The lifetime evaluation of the DC-link capacitor under different modulation methods is performed at component level first and then system level by considering all capacitors by applying Monte Carlo simulation. Furthermore, their effects on the efficiency and THD of the output current are also considered.

주제어

표/그림 (9)

그림 Fig. 1. Structure of three-level inverter.
그림 Fig. 2. Space vector diagram and voltage modulation method. (a) SVM (b) TMSVM (c) MLSVM (d) RAMSVM
그림 Fig. 4. Line voltage and THD of output current according to voltage modulation method. (a) SVM (b) TMSVM (c) MLSVM (d) RAMSVM
그림 Fig. 5. DC-link capacitor current I_C-according to voltage modulation method. (a) SVM (b) TMSVM (c) MLSVM (d) RAMSVM
그림 Fig. 3. Total power losses of power devices according to voltage modulation method.
표 TABLE I PARAMETERS OF SIMULATION
그림 Fig. 6. The results of FFT analysis of I_C- according to voltage modulation method. (a) SVM (b) TMSVM (c) MLSVM (d) RAMSVM
그림 Fig. 7. Unreliability of capacitors according to voltage modulation method.
표 TABLE II POWER LOSS AND OPERATING TEMPERATURE OF DC-LINK CAPACITOR ACCORDING TO MODULATION METHOD

참고문헌 (9)

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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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