电压暂降过程中敏感动态负荷建模问题研究

在讨论电压暂降过程中敏感动态负荷建模时,对具有功率恢复特性的非线性动态负荷模型进行了分析,采用二阶微分方程描述功率恢复。综合负荷中的敏感负荷成分是电压暂降分析最为关注的问题,在功率恢复动态模型的基础上将敏感设备的ITIC曲线作为影响负荷变化的因素,合理描述了电压暂降过程中敏感设备的异常运行对综合负荷功率变化的影响。用EMTDC对该负荷模型进行了仿真验证,结果证明了其有效性。

Study on Sensitive Dynamic Load Modelling during Voltage Sag Process

As application of power electronics in commercial and industrial sectors grows rapidly, voltage sags have become one of the major power quality concerns in recent years. This paper is devoted to study load modelling for dynamic sensitive load during voltage sag process, a nonlinear dynamic load model with the power recovery is considered, second order differential equations are adopted to describe the power recovery. Because the sensitive loads are the focus of the voltage sag, its voltage tolerance curves should be considered. In this paper, ITIC curve is a factor which influences the power recovery, it is contained by the dynamic load model, the new model developed in the paper is checked by EMTDC simulation, and the results prove that it can provide a good approximation of dynamic loads with sensitive equipments.