Journal
2020 IEEE 9TH INTERNATIONAL POWER ELECTRONICS AND MOTION CONTROL CONFERENCE (IPEMC2020-ECCE ASIA)
Volume -, Issue -, Pages 3499-3504Publisher
IEEE
DOI: 10.1109/IPEMC-ECCEAsia48364.2020.9367954
Keywords
Y-matrix modulation; modular multilevel converter; state-space model; arm inductor
Categories
Funding
- Engineering Research Center Program of the National Science Foundation
- Department of Energy under NSF [EEC1041877]
- CURENT Industry Partnership Program
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Y-Matrix Modulated (YMM) Modular Multilevel Converter (MMC) was proposed recently. This modulation utilizes the self-voltage balancing capability of an MMC so that the conventional voltage balancing algorithm of MMC can be eliminated. YMM demonstrates that MMC has inherent self-voltage balancing capability. However, YMM assumes the voltage drop on the arm inductor to be zero to achieve MMC self-voltage balancing. This paper quantitatively justifies the zero voltage drop assumption for YMM based MMC and derives the general state-space model for MMC. Based on the general state-space model, the time-domain state variable dynamics are derived. The arm inductor assumption is justified by using the state variable dynamics. A criterion to determine the arm inductance value is given in this paper to quantify the zero voltage drop assumption. Simulation studies are provided to verify the state-space model derivation and the quantification of arm inductors.
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