An improved deadbeat current control scheme with a novel adaptive self-tuning load model for a three-phase PWM voltage-source inverter

Yasser Abdel Rady Ibrahim Mohamed, Ehab F. El-Saadany

Research output: Contribution to journalArticlepeer-review

235 Scopus citations

Abstract

In this paper, an improved deadbeat current control scheme with a novel adaptive self-tuning load model for a three-phase pulsewidth-modulated (PWM) voltage-source inverter is proposed. First, to achieve high-bandwidth current control characteristics, an improved deadbeat current controller with delay compensation is adopted. The compensation method forces the delay elements, which are caused by voltage calculation, PWM, and synchronous frame rotation, to be equivalently placed outside the closed-loop control system. Hence, their effect on the closed-loop stability is eliminated, and the current controller can be designed with a higher bandwidth. Second, to relax the parameter sensitivity issue of the deadbeat controller and to realize a control scheme with reduced sensors, a novel adaptive self-tuning load model is emerged in the control structure. The adaptive model is designed with low computational demand to estimate in real time the load parameters (R, L) and the back-electromotive-force voltage simultaneously. A unified solution to the present nonlinear estimation problem is presented by adopting a parallel observer structure. Furthermore, the adaptive model has the necessary phase advance of the estimated quantities, which compensates for the total system's delay. Comparative evaluation results are presented to demonstrate the validity and effectiveness of the proposed control scheme.

Original languageBritish English
Pages (from-to)747-759
Number of pages13
JournalIEEE Transactions on Industrial Electronics
Volume54
Issue number2
DOIs
StatePublished - Apr 2007

Keywords

  • Deadbeat current control
  • Digital current control
  • Pulsewidth-modulated (PWM) inverters
  • Robust adaptive estimation

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