基于谐波状态空间的变换器建模方法

A modeling method for a converter based on harmonic state space

谐波状态空间(HSS)建模因其强大的谐波分析能力越来越受到关注,但由于其复杂的建模过程及庞大的模型尺寸限制了其在电力电子系统中的应用。以基于正弦脉宽调制的三相电压源型变换器为例说明了一种便于使用的方法来获得电力系统开环大信号HSS模型。基于三相平衡关系提出了在保持与原模型同样的结构和变量、不影响HSS建模精度的条件下减小模型尺寸的HSS降阶模型。通过在Simulink中搭建变换器仿真,并与HSS模型计算结果对比,验证所提模型的有效性。

Harmonic State-Space(HSS)modeling,because of its considerable ability in undertaking harmonic analysis,is gaining increasing attention,but the complex modeling process and the large size of model limits its application in power electronic systems.This paper illustrates a convenient method to obtain the open-loop large signal HSS model of a power system by taking the three-phase voltage source converter with SPWM as an example.An HSS reduced order model with the same structure and variables as the original model is proposed based on the three-phase equilibrium relationship.By constructing a converter simulation in Simulink,the effectiveness of the proposed model is verified by comparing with the calculated results of the HSS model.