交直流配电网系统中准Z源网络的小信号模型分析与验证

配电网中Z源网络的引入可以灵活控制电压的输出，实现高效率的电能变换。为了详细分析准Z源网络拓扑的模型特征，利用状态空间法和小信号建模方法提出、分析并验证了一种应用于配电网中准Z源网络的小信号模型特征。首先，利用状态空间法推导了准Z源网络的数学模型；然后，利用小信号模型对准Z源网络进行暂态分析，并得出电感电流和电容电压传递函数。另外，详细分析了两种传递函数的零、极点分布情况，并得出了系统稳定性变化的特征。最后，利用MATLAB/Simulink软件仿真的结果和物理样机试验验证了所提方法的有效性。

Analysis and Verification of Small-Signal Model of Quasi-Z-Source Network in AC/DC Distribution Network System

The introduction of the Z-source network in the distribution network can flexibly control the voltage and achieve high-efficiency conversion of electric energy. In order to analyze the model characteristics of the quasi-Z-source topology in detail, a small-signal model characteristic applied to the quasi-Z-source network in the distribution network by using the state-space method and the small-signal modeling method is proposed, analyzed and verified. Firstly, the state-space method is used to deduce the mathematical model of the quasi-Z-source network. Secondly, the transient analysis is carried out on the quasi-Z-source network by using the small-signal model, and the transfer functions of inductive current and capacitive voltage are obtained. In addition, the zero and pole distributions of the two transfer functions are analyzed in detail, and the characteristics of system stability are obtained. Finally, the results of the MATLAB/Simulink simulation and physical prototype experiments are presented for validating the proposed strategy.