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Discrete-Time DC-Link Voltage and Current Control of a Grid-Connected Inverter with LCL-Filter and Very Small DC-Link Capacitance

Author

Listed:
  • Oliver Kalmbach

    (Faculty of Electrical Engineering and Information Technology, Munich University of Applied Sciences, Lothstraße 64, 80335 München, Germany)

  • Christian Dirscherl

    (Munich School of Engineering, Technical University of Munich, Lichtenbergstraße 4a, 85748 Garching, Germany)

  • Christoph M. Hackl

    (Faculty of Electrical Engineering and Information Technology, Munich University of Applied Sciences, Lothstraße 64, 80335 München, Germany)

Abstract

The paper presents a controller design for grid-connected inverters (GCI) with very small dc-link capacitance that are coupled to the grid via an LCL filter. The usual controller designs would fail and result in instability. The proposed controller has a cascaded structure with a current controller as inner control loop and an outer dc-link voltage controller. The controller design is performed in discrete time and it is based on a detailed stability analysis of the dc-link voltage controller to determine the controller parameters which guarantee stability for all operating points. The inner loop is a state-feedback current controller that is designed based on the discrete linear-quadratic regulator (DLQR) theory. An additional integral error feedback assures steady-state accuracy of the current control loop. The simulation and experimental results validate performance and stability of proposed controller design.

Suggested Citation

  • Oliver Kalmbach & Christian Dirscherl & Christoph M. Hackl, 2020. "Discrete-Time DC-Link Voltage and Current Control of a Grid-Connected Inverter with LCL-Filter and Very Small DC-Link Capacitance," Energies, MDPI, vol. 13(21), pages 1-23, October.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:21:p:5613-:d:435359
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    Cited by:

    1. Juliano C. L. da Silva & Thales Ramos & Manoel F. Medeiros Júnior, 2021. "Modeling and Harmonic Impact Mitigation of Grid-Connected SCIG Driven by an Electromagnetic Frequency Regulator," Energies, MDPI, vol. 14(15), pages 1-21, July.

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