Robust Direct Control of Voltage Amplitude and Phase Angle for Grid-Forming Inverters
IEEE Journal of Emerging and Selected Topics in Industrial Electronics, cilt.7, sa.4, ss.1710-1722, 2026 (ESCI, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 7 Sayı: 4
- Basım Tarihi: 2026
- Doi Numarası: 10.1109/jestie.2026.3722743
- Dergi Adı: IEEE Journal of Emerging and Selected Topics in Industrial Electronics
- Derginin Tarandığı İndeksler: Emerging Sources Citation Index (ESCI), Scopus
- Sayfa Sayıları: ss.1710-1722
- Anahtar Kelimeler: Amplitude–angle modeling, direct amplitude- angle control, grid-forming inverter (GFM), nonlinear control, super-twisting sliding mode control (ST-SMC)
- Gazi Üniversitesi Adresli: Evet
Özet
Grid-forming inverters (GFMs) play a key role in ensuring stable operation of low-inertia and weak-grid systems. However, conventional control strategies based on dq/αβ cascaded loops suffer from performance limitations under large-signal disturbances and nonlinear operating conditions. This article proposes a novel amplitude–angle-based modeling and control framework for GFMs, where the inverter dynamics are directly expressed in terms of output voltage amplitude and phase angle, avoiding the conventional synchronous dq-frame transformation and cascaded voltage–current control loops. Based on this formulation, a super-twisting sliding mode controller is designed to directly regulate voltage amplitude and phase angle, ensuring strong robustness against parameter variations, nonlinearities, and grid disturbances. Experimental results for single and two-GFM islanded systems are carried out to demonstrate fast dynamic response, effective power-sharing performance, and robustness under parameter variations and large voltage/frequency reference changes. Furthermore, the proposed amplitude–angle formulation is intended to provide a general framework for the systematic design of advanced nonlinear control strategies for GFMs.