Multivariable Optimal Control of a Direct AC/AC Converter under Rotating dq Frames

Yun Wan; Steven Liu; Jianguo Jiang

Multivariable Optimal Control of a Direct AC/AC Converter under Rotating dq Frames

Yun Wan

Steven Liu

Jianguo Jiang

Vol. 13, No. 3, pp. 419-428, May 2013

10.6113/JPE.2013.13.3.419

dq modeling

Hexverter

Modular multilevel cascade converter (MMCC)

Multivariable optimal control

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Abstract

The modular multilevel cascade converter (MMCC) is a new family of multilevel power converters with modular realization and a cascaded pattern for submodules. The MMCC family can be classified by basic configurations and submodule types. One member of this family, the Hexverter, is configured as Double-Delta Full-Bridge (DDFB). It is a novel multilevel AC/AC converter with direct power conversion and comparatively fewer required components. It is appropriate for connecting two three-phase systems with different frequencies and driving an AC motor directly from a utility grid. This paper presents the dq model of a Hexverter with both of its AC systems by state-space representation, which then simplifies the continuous time-varying model into a periodic discrete time-invariant one. Then a generalized multivariable optimal control strategy for regulating the Hexverter’s independent currents is developed. The resulting control structure can be adapted to other MMCCs and is flexible enough to include other control criterion while guaranteeing the original controller performance. The modeling method and control design are verified by simulation results.

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Cite this article

[IEEE Style]

Y. Wan, S. Liu, J. Jiang, "Multivariable Optimal Control of a Direct AC/AC Converter under Rotating dq Frames," Journal of Power Electronics, vol. 13, no. 3, pp. 419-428, 2013. DOI: 10.6113/JPE.2013.13.3.419.

[ACM Style]

Yun Wan, Steven Liu, and Jianguo Jiang. 2013. Multivariable Optimal Control of a Direct AC/AC Converter under Rotating dq Frames. Journal of Power Electronics, 13, 3, (2013), 419-428. DOI: 10.6113/JPE.2013.13.3.419.