Abstract
This paper focuses on an application of the modular multilevel cascade converter based on triple-star bridge-cells (MMCC-TSBC) to adjustable-speed motor drives. The TSBC is one of direct ac-to-ac power converters capable of bidirectional power flow with three-phase sinusoidal input and output currents. Therefore, it is suitable to medium-voltage high-power motor drives requiring regenerative braking. This paper designs, constructs, and tests a three-phase 400-V, 15-kW, downscaled model with four bridge-cells per cluster, adopting the so-called “phase-shifted PWM” to produce multilevel waveforms at both sides. Good operating performance is verified by some experimental results obtained from the downscaled model. On the other hand, the TSBC suffers from such a serious problem that capacitor-voltage fluctuation becomes larger as the motor (output) frequency is closer to the supply (input) frequency. This paper also has an intensive discussion on how to control the TSBC intended for achieving a broad range of frequency control. Theoretical analysis and computer simulation confirm the effectiveness and viability of the proposed control method.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.