Robust Fuzzy-Fractional-Order Nonsingular Terminal Sliding-Mode Control of LCL-Type Grid-Connected Converters

Bo Long, Peng Jie Lu, Kil To Chong, Jose Rodriguez, Josep Guerrero

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


Sliding-mode control (SMC) has been widely used in grid-connected converter system (GCC) systems because of its robustness to parameter variations and external disturbances. However, chattering in SMC may deteriorate the tracking accuracy and can easily excite high-frequency unmodeled dynamics. To solve this problem, this article presents a fuzzy-fractional-order nonsingular terminal sliding-mode controller (Fuzzy-FONTSMC) for the grid current control of LCL-GCCs. First, the system modeling, design of the integer-order NTSMC controller, and state estimation based on the Kalman filter to minimize the sampling sensors are described. Second, the Fuzzy-FONTSMC controller is introduced for optimal fraction-order selection and chattering mitigation, this controller exhibits fast convergence with high tracking accuracy and strong robustness. Finally, the Lyapunov theorem is used to analyze the system stability. Experimental comparisons on a 10-kVA laboratory prototype validate the superior performance and effectiveness of the proposed method under many scenarios.

Original languageEnglish
Pages (from-to)5854-5866
Number of pages13
JournalIEEE Transactions on Industrial Electronics
Issue number6
Publication statusPublished - 1 Jun 2022


  • Fractional-order derivative
  • Grid-connected converter (GCC)
  • Nonsingular terminal SMC
  • Sliding-mode control (SMC)

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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