Application of a sinusoidal internal model to current control of three-phase utility-interface converters

• Published in: IEEE transactions on industrial electronics (1982) Vol. 52; no. 2; pp. 420 - 426
• Main Authors: Fukuda, S., Imamura, R.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.04.2005; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Active filter; Converters; Current control; Errors; Frequency synchronization; Mathematical models; Prototypes; Rectifiers; Reference signals; Regulators; Resonant frequencies; Resonant frequency; sinusoidal internal model; Static power converters; static synchronous compensator (STATCOM); Steady-state; Synchronous; Transfer functions; Utilities; Voltage; voltage-source pulsewidth-modulation (PWM) converter
• ISSN: 0278-0046; 1557-9948
• DOI: 10.1109/TIE.2005.843914

Three-phase voltage-source converters are used as utility interfaces. In such a case, the converter line currents are required to track sinusoidal references synchronized with the utility grid without a steady-state error. In this paper a current control method based on a sinusoidal internal model is employed. The method uses a sine transfer function with a specified resonant frequency, which is called an S regulator. The combination of a conventional proportional-integral (PI) regulator and an S regulator is called a PIS regulator. The PIS regulator ensures that the steady-state error in response to any step changes in a reference signal at the resonant frequency and 0 Hz reduces to zero. An experiment was carried out using a 1-kVA prototype of three utility-interface converters, a voltage-source rectifier, an active power filter, and static synchronous compensator. Almost perfect current-tracking performance could be observed.