Journal of Modern Power Systems and Clean Energy

ISSN 2196-5625 CN 32-1884/TK

A Sliding Mode Controller Based on Robust Model Reference Adaptive Proportional-integral Control for Stand-alone Three-phase Inverter
Affiliation:

Arak University of Technology, Arak, Iran

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    Abstract:

    This paper proposes a sliding mode controller based on robust model reference adaptive proportional-integral (RMRA-PI) control for a stand-alone voltage source inverter (SA-VSI). The proposed controller has two control loops where the coefficients of PI controller are regulated by the adaptive sliding law. This method is used to regulate the output voltage of the inverter under different load conditions and uncertainty, and adapts the output to the reference model to reduce the total harmonic distortion (THD). In this paper, the stability of the proposed controller is proven by using Lyapunovs theory and Barbalets lemma. The proposed controller performs well in voltage regulation such as low THD under sudden load change and uncertainty. Also, the results of the proposed controller are compared with PI controller to show the effectiveness of the presented control system.

    表 1 Table 1
    图1 Schematic of three-phase SA-VSI with an LC output filter.Fig.1
    图2 General structure of MRAC system.Fig.2
    图3 Schematic of SA-VSI control with decoupling matrixes for current loop.Fig.3
    图4 Schematic of SA-VSI control with decoupling matrixes for voltage loop.Fig.4
    图5 Block diagram of structure and control.Fig.5
    图6 Output voltage for R-L load. (a) Proposed controller. (b) PI scheme.Fig.6
    图7 Output voltage of R-L load and sudden change of load. (a) Voltage in d-axis. (b) Voltage in q-axis. (c) Current in d-axis. (b) Current in q-axis.Fig.7
    图8 PI controller coefficients for different loops. (a) Current loops in d-axis and q-axis. (b) Voltage loops in d-axis and q-axis.Fig.8
    图9 Output voltage in uncertainty of filter inductor. (a) Proposed controller. (b) Conventional PI (PI-PI).Fig.9
    图10 Output voltage in uncertainty of filter inductor. (a) Voltage in d-axis. (b) Voltage in q-axis. (c) Current in d-axis. (d) Current in q-axis.Fig.10
    图11 PI controller coefficients for different loops under uncertainty. (a) Current loops in d-axis and q-axis. (b) Voltage loops in d-axis and q-axis.Fig.11
    图12 Circuit for nonlinear load.Fig.12
    图13 Output voltage of nonlinear load. (a) Proposed controller. (b) PI-PI scheme.Fig.13
    表 3 Table 3
    表 2 Table 2
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History
  • Received:February 14,2019
  • Online: May 19,2021