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Lyapunov-based digital control of grid-connected inverter with an LCL filter

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3 Author(s)
Kato, T. ; Dept. of Electr. Eng., Doshisha Univ., Kyotanabe, Japan ; Inoue, K. ; Ueda, M.

Instabilities due to mutual interactions among converters and inverters are sometimes observed. A system with multiple converters can be controlled stably overall when each converter is controlled according to each energy-based function like the Lyapunov function. This paper proposes a new Lyapunov-based digital control method. First its principle is derived especially for a digital control. Then a new numerical generator for reference waveforms is proposed to avoid complex analytical operations. It is applied to a grid-connected inverter with an LCL filter. The proposed methods are investigated and validated through simulation by Saber and experiment by a DSP-based digital control system.

Published in:

Control and Modeling for Power Electronics (COMPEL), 2013 IEEE 14th Workshop on

Date of Conference:

23-26 June 2013