HF Test Current Injection-Based Self-Sensing Control of PMSM for Low- and Zero-Speed Range Using Two-Degree-of-Freedom Current Control

Abstract

This paper deals with an innovative self-sensing control scheme based on test current instead of voltage injection. Using two-degree-of-freedom current control, one can overcome the bandwidth limitations that made test current injection unattractive during the last 20 years. The two-degree-of-freedom control scheme consists of a model-based dynamic feedforward control to set the reference response and model reference tracking controllers providing disturbance rejection and position error signals for self-sensing control. Since two-degree-of-freedom control is a model-based control scheme, the compensation for secondary saliencies is inherently included in the precontrol. It is analytically shown that, in the case of alternating test current instead of voltage injection, just the precise knowledge, in general, of the currentand position-dependent secondary diagonal element of the inductance matrix is needed in the case of inductance saliency-based self-sensing control. The effectiveness of the proposed method is proven by experimental results.

Self-Adaptive High-Frequency Injection Based Sensorless Control for Interior Permanent Magnet Synchronous Motor Drives

“…This could represent a viable solution to the issue of unknown inductances. Similar to Figure 6, the magnitude of injection voltage signal can be adapted in a closed-loop fashion, aimed to obtaining a constant and known average high-frequency current magnitude 0 (as obtained in (22)), which is related to the torque ripple and acoustic noise. The anisotropy-related component can be regulated in order to achieve constant desired HF current magnitude by adapting the injection voltage.…”

“…This gain results in increased damping and higher noise suppression. Various methods and approaches have been proposed in the literature for identification of HF frequency and fundamental effects during transients, a model-based controller design has been proposed in [16,22] where two-degree of freedom in control has been used to separate the fundamental and HF effects during transient stages. A modified feed-forward control has been demonstrated for mid-to high-speed range operations, eliminating the need of any additional back EMF estimator.…”

Current harmonic suppression in the flux-weakening control based on resonant-2DOF PID controllers for permanent magnet synchronous linear motor

“…Due to the traditional PID controller can't make the system set point tracking ability and anti-disturbance performance achieve optimality at the same time because of its defects [6], [7]. Hence, on the basis of the traditional PID controller, the setting value filter type 2DOF PID controllers are designed in this paper; on the other hand, the resonant controllers can suppress the current harmonics effectively, and improve the system run smoothly ability because of their high control gain at their resonant frequencies [8].…”