工业园区配电网感应电机负荷与电压暂降的相互影响研究

Research on Interactions Between Induction Motor Load and Voltage Sag in Distribution Network for Industrial Park

现代工业园区中由电压暂降引起的电能质量问题日益突出。为了对电压暂降的传播机理进行深入的研究,本文首先对工业园区配电网中感应电机负荷因电压暂降引起的动态响应特征进行理论分析,建立等效电路和数学模型,分析感应电机负荷与电压暂降过程的交互作用。然后,对不同严重程度、不同短路故障原因、不同持续时间下的电压暂降,利用电力系统仿真软件进行分析验证。最后,考虑在不同的配网结构及转动惯量参数条件下,感应电机负荷对电压暂降的影响。仿真表明,感应电机负荷有抗拒电压幅值突变的特性,其转动惯量参数是造成这一特性的主要原因,并且这一特性的影响会随电压暂降在配网中传播。

In modern industrial parks,power quality issues caused by voltage sag are becoming increasingly serious. To explore the transmission mechanism of voltage sag,the dynamic response characteristics of induction motor load caused by voltage sag in the distribution network for industrial park is theoretically analyzed at first. The equivalent circuit and mathematical model are established,and the interactions between induction motor load and voltage sag are also analyzed. Then,a power system simulation software is used to analyze and verify the voltage sags of different degrees of severity,different short-circuit fault causes,and different durations. Finally,the influences of induction motor load on voltage sag are considered under the condition of different distribution network structures and different moments of inertia. Simulation results show that the induction motor load has the characteristic of resistance to voltage amplitude mutation,which is primarily caused by the parameter of moment of inertia. In addition,the effect of this characteristic will propagate in the distribution network along with voltage sag.