DC-Bus Ripple Current Characterization of Three-Phase 2/3L-VSIs Considering the Spectral Characteristics

Date

2015-06-05

Author

Özkan, Ziya
Hava, Ahmet Masum

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The selection and sizing of the dc-bus capacitor for applications utilizing three-phase PWM operated voltage source inverters (VSIs), such as grid connected photovoltaic systems and motor drives are presented based on the spectral characteristics of the dc-bus current. The characterization is provided for two and three-level VSIs (2/3L-VSIs) for popular PWM methods with modulation index (M-i) and the phase angle (phi) being variable. Based on the spectral characteristics, normalized dc-bus ripple current RMS values (K-dc) are obtained which are used to calculate thermal characteristics of the dc-bus capacitor. Similarly, the dc-bus voltage ripple characteristics are provided in a normalized manner so that they can be adapted to intended design for voltage ripple calculation. Then, considering the thermal and voltage ripple constraints, a thorough algorithm for dc-bus capacitor design is provided and illustrated through examples. The proposed approach constitutes simple and rigorous guide to design dc-bus capacitors for 2/3L-VSIs.

Subject Keywords

VSI, Three-level, Two-level, Sizing, Ripple, PWM, Inverter, Harmonic, Current, Capacitor, DC-bus

URI

https://hdl.handle.net/11511/53527

Conference Name

9th International Conference on Power Electronics / Energy Conversion Congress and Exposition Asia (ICPE-ECCE Asia)

Collections

Department of Electrical and Electronics Engineering, Conference / Seminar

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Citation Formats

Z. Özkan and A. M. Hava, “DC-Bus Ripple Current Characterization of Three-Phase 2/3L-VSIs Considering the Spectral Characteristics,” presented at the 9th International Conference on Power Electronics / Energy Conversion Congress and Exposition Asia (ICPE-ECCE Asia), Seoul, SOUTH KOREA, 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/53527.