Direct Field-Oriented Control of Induction Motor With Discrete Full-Order Flux Observer

Le résumé fourni par la source

The full-order flux observer has only been preliminarily applied in high-performance direct field orientation control (DFOC) of induction motors (IM). However, in high-power and high-speed motor drives, the control system operates under low switching-to-fundamental frequency ratio (SFR), so the full-order flux observer based on conventional discretization methods no longer meets the requirements due to significant discretization errors. To solve this problem, this paper proposes an eigenvalue based discrete full-order flux observer and feedback gains are designed in z-domain to ensure stability and dynamic performance. Additionally, the parameter robustness analysis is conducted on the proposed DFOC syetem to ensure high parameter robustness in the medium and high speed range. Rigorous simulations and experiments are performed to verify that the proposed discrete full-order flux observer exhibits a high level of discretization accuracy and the proposed DFOC system achieves excellent stability and dynamic performance under low switching-to-fundamental frequency ratio.

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