考虑电力电子变换器的电力系统动态负荷建模

Dynamic Load Modeling of Power System Considered Power Electronic Converters

随着新能源发电大量接入电网,负荷侧不可避免地接入电力电子变换器,负荷的动态模型受到了一定程度的影响,原有的经典感应电机模型不能完全适应发电模式的变化,为此,提出一种考虑电力电子变换器的感应电机动态模型。经过推导得出了基于物理模型的传递函数表达式,并在Matlab/Simulink仿真平台搭建物理模型和建立动态模型;通过2组电压跌落的仿真实验进行对比研究。研究结果表明:2种模型具有较好的一致性,验证了该动态模型的正确性。

Power system load modeling is useful for analyzing the safety and stability of the power grid,scientifically and rationally operating dispatching and planning design.It is of great significance to fully tap the power supply potential of the power grid and even save the investment in power grid construction.However,as a large number of new energy generation is connected to the grid,power electronic converters are inevitably connected to the load side.Therefore,the dynamic model of the load is affected to a certain extent.The original classic induction motor model cannot fully adapt to the power generation mode.Therefore,a dynamic model of induction motor considering the power electronic converter is proposed,After deduction,the transfer function expression based on the physical model is obtained.The physical model and the established dynamic model are built on the MATLAB/SIMULINK simulation platform.Through two sets of voltage sag simulation experiments,a comparative analysis and research are conducted.The results show that the two models have good consistency.Finally,the correctness of the dynamic model is verified.