基于dq统一频率变换的电力系统宽频带仿真与分析

随着高比例新能源电力系统的电力电子化特征凸显,电力系统宽频带仿真面临挑战.首先介绍了基于dq统一频率变换建模的基本理论,分析了基于dq统一频率变换建模与准静态相量建模的异同点.而后基于该基本理论,建立了同步发电机、双馈风力发电机和电力网络的多尺度仿真模型.进一步针对系统仿真和分析中的电网高维问题,提出了系统网络简化方法...

Power system wideband simulation and analysis based on dq unified frequency transformation

With the prominent characteristics of power electronization in high-proportion new energy power system, the power system wideband simulation faces challenges. Firstly, the basic theory of dq unified frequency transformation modeling is introduced, and the similarities and differences between dq unified frequency transform modeling and quasi-static phase modeling are analyzed. Then, based on this basic theory, the multi-scale simulation model of synchronous generator, doubly-fed wind turbine generator and power network is established. Furthermore, aiming at the high-dimensional problem of power grid in system simulation and analysis, a method of system network simplification is proposed to reduce the model order. Finally, IEEE 3-machine 9-bus test system is adopted to verify the accuracy of the proposed simulation model. The simulative results show that the proposed modeling method can correctly calculate the wideband simulation model under oscillation mode, which compensates the shortage that the electro-magnetic transient model cannot calculate the small signal stability mode. Meanwhile, the proposed modeling method has the abilities of fast wideband simulation and high accuracy consistent with the electro-magnetic transient model, which is suitable for large-scale power simulation and analysis.