Sliding-Mode Control in Natural Frame With Reduced Number of Sensors for Three-Phase Grid-Tied LCL-Interfaced Inverters

ALTIN N., ÖZDEMİR Ş., Komurcugil H., SEFA İ.

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, cilt.66, sa.4, ss.2903-2913, 2019 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 66 Sayı: 4
  • Basım Tarihi: 2019
  • Doi Numarası: 10.1109/tie.2018.2847675
  • Dergi Adı: IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.2903-2913
  • Anahtar Kelimeler: Damping, grid-tied inverter, proportional-resonant (PR) control, sliding-mode control (SMC), VARIABLE-STRUCTURE CONTROL, CONNECTED VSI, CONTROL STRATEGY, DESIGN
  • Gazi Üniversitesi Adresli: Evet

Özet

In this paper, a sliding-mode control (SMC) strategy is proposed for three-phase grid-tied LCL-filtered voltage source inverters in the natural frame. The SMC in the natural frame is based on controlling the sliding surface functions of phase-legs a and b. The sliding surface function of phase-leg c is obtained from the sliding surface functions of phase-legs a and b. This eliminates the need for sensing capacitor voltage and grid current of phase-leg c. The capacitor voltage references are generated by the proportional-resonant (PR) controllers which result in zero steady-state error in the grid current. The feasibility and performance of the proposed SMC strategy is investigated under steady-state, transient, unbalanced, and distorted grid conditions. Experimental results taken from a 9.8 kW system are provided to demonstrate the validity of the proposed SMC strategy.