Enhanced Voltage Sensorless Control for a PWM Converter with DSOGI-FLL Under Grid Disturbances

Seung-Pyo Kang, Dong-Youn Kim and Jang-Mok Kim ()
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Seung-Pyo Kang: Department of Electrical Engineering, Pusan National University, Busan 46241, Republic of Korea
Dong-Youn Kim: Department of Research and Development, Hyowon Powertech Company, Busan 46241, Republic of Korea
Jang-Mok Kim: Department of Electrical and Electronics Engineering, Pusan National University, Busan 46241, Republic of Korea

Energies, 2025, vol. 18, issue 9, 1-28

Abstract: This paper presents Enhanced Voltage Sensorless Control for PWM converter with DSOGI-FLL under grid disturbances. Even without grid voltage sensors, the proposed method accurately estimates the grid angle and voltage, which are necessary for power transfer between the DC link of the PWM converter and the grid. The estimated grid voltage obtained through observer design is separated into positive and negative sequence components, and the grid frequency is estimated using the Dual Second-Order Generalized Integrator Quadrature Signal Generator (DSOGI-QSG) and Dual Second-Order Generalized Integrator Frequency-Locked Loop (DSOGI-FLL). The estimated positive and negative sequence voltages were effectively controlled using a dual current controller. The method operates effectively under normal, balanced AC source conditions and in various grid fault scenarios, including unbalanced voltage, harmonic distortion, voltage sag, and frequency step changes. The validity of the proposed method was evaluated through experimental results by using a grid simulator to implement the fault condition.

Keywords: sensorless control; voltage source converter; voltage source converter (VSC); grid voltage estimation technique; grid-connected PWM converter (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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