دانلود ترجمه مقاله سیستم درایو موتور القایی توان بالا با پیش تحریک پیشرفته دی سی با کنترل شار موثر پیوندی – نشریه IEEE 2011

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Abstract

This paper proposed an enhanced dc preexcitation for a variable-voltage variable-frequency-controlled induction motor drive system. Voltage vectors were adjusted according to the reactive component of the motor current, which promptly established the effective value of the motor flux linkage at the preexcitation stage and restrained its trajectory strictly as a round circle all through the starting process. The enhanced dc preexcitation control led to more negligible flux-linkage distortion, less torque vibration, and significantly smaller inrush current. Experiments on a 380-VAC/315-kW adjustable speed drive system validated the effectiveness of the proposed method.

I. INTRODUCTION

IN motor drive systems, the startup control is always a critical issue due to the inrush current in the starting process, which tends to damage the motor insulation and endanger the semiconductor devices [1]–[۴]. It is highly related to the absence of the effective flux linkage. Vector controls, e.g., the direct torque control (DTC) and field-oriented control (FOC), have been validated capable of delivering the targeted torque and depressing the startup current through processing the accurate flux-linkage observation and control. However, they suffer from the nonlinearity of power devices and the complication of the parameter identification. Both FOC and DTC face the challenges of the inaccurate flux-linkage observation, which is of particular importance for the sensorless vector control at lowspeed operation [5], [6].