Interleaved DC–DC converters have significant advantages in improving the capability of power converters, and coupling the filtering inductor of the converter could further increase the power density. However, existing modeling and controller designs are complex and require multiple sensors to be involved in the control, which is not conducive to engineering implementation and reducing production costs. In view of this problem, taking a two-phase interleaved boost converter with a coupled inductor as an example, the small-signal models of the converter are derived for the resistive load and constant voltage source load using the state averaging method. The total inductor current is engaged in the control as a feedback signal, avoiding the coupling effect of the inductor on increasing the complexity of the controller. Based on this, a double closed-loop controller is designed, and a prototype of the two-phase interleaved boost converter with coupled inductor is built. Only one current sensor and one voltage sensor are required to participate in the control. The effectiveness of the analysis and design in this paper are verified by experiments.
Mechanical faults in AC drive systems lead generally to periodic load torque ripple which reflects as speed vibration and leads to harmonic components in motor stator current. The deterioration of speed and stator current, called rotation‐frequency oscillations in this study, may degrade motor control accuracy and even cause for instability. In this study, a strategy using active control of stator current is proposed to suppress the rotation‐frequency oscillations in AC drive systems. First, the magnetomotive force and permeance approach is used to study the influence of the mechanical faults on the stator current of permanent magnet synchronous motor (PMSM). Second, in the proposed strategy, an improved current regulator cascading a proportional–integral regulator with a quasi‐proportional resonance (QPR) regulator is designed, and the mechanism of rotation‐frequency oscillations suppression strategy is analysed. In addition, digital realisation method and parameters design process for QPR regulator are introduced. Experimental evaluation of the proposed strategy is implemented on a PMSM traction system under mechanical faults, load disturbance and so on. Test results show that with the proposed strategy, speed vibration and current harmonic components caused by mechanical faults are suppressed significantly.
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