计及变频器的感应电动机负荷特性分析

Load Characteristics of the Induction Motor with Inverter

感应电动机是电力系统中最常见的动态负荷类型,其负荷特性对电力系统运行有着重要影响。当前随着变频器在工业界的广泛应用,带变频器的感应电动机负荷特性与传统感应电动机负荷存在很大的不同。通过建立带PWM变频器感应电动机的数学模型,研究其有功功率P和无功功率Q在稳态低电压及故障动态时的变化情况,分析了计及变频器的感应电动机负荷特性,并与传统感应电动机负荷进行比较。

The induction motor is one of the most common loads in the power system and its operating characteristics have important effects on the power system. At present,inverters are widely used in the industry. The load characteristics of the induction motor equipped with the inverter is significantly different from those of the conventional induction motor. By establishing the mathematical model of the induction motor equipped with the PWM inverter,this paper studies variations of the active power P and reactive power Q in the steady low voltage and fault dynamic state, and analyzes the load characteristics of the induction motor with consideration of effects of the inventor equipped and finally compares it with the traditional induction motor.