频率耦合阻抗模型的性质及其适用性分析  

Analysis of the Properties and Applicability of the Frequency Coupling Impedance Model

作　　者：徐政[1] XU Zheng(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学电气工程学院,杭州310027

出　　处：《高电压技术》2023年第10期4058-4068,共11页High Voltage Engineering

摘　　要：阻抗分析法是分析含电力电子装置电力系统谐振稳定性的有效方法,建立能够准确描述电力电子装置动态特性的阻抗模型是应用阻抗分析法的关键。该文论述了谐振稳定性的定义、物理机理和基本性质,对谐振稳定性的主要分析方法进行了评述。针对一个由非线性电阻构成的简单三相系统,推导了基于Fourier级数展开的谐波线性化模型和基于Taylor级数展开的增量线性化模型及其派生的频率耦合阻抗模型。揭示了频率耦合阻抗模型不是控制理论意义上的线性模型,因而不适用于与其他元件的线性模型联接在一起,并应用线性系统理论来分析电力系统的谐振稳定性,并构造了一个简单算例系统对上述论断进行验证。The impedance analysis method is an effective method for analyzing the resonance stability of power systems containing power electronic devices.Establishing an impedance model that can accurately describe the dynamic characteristics of a power electronic device is the key to applying the impedance analysis method.In this paper,the definition,physical mechanism and basic properties of the resonance stability are discussed,and the main methods for analyzing the resonance stability are reviewed.Focusing on a simple three-phase system composed of nonlinear resistors,the harmonic linearization model based on the Fourier series expansion and the incremental linearization model based on the Taylor series expansion and its derivative frequency coupling impedance model are derived.It is revealed that the frequency coupling impedance model is not a linear model in the sense of control theory.It is shown that the frequency coupling impedance models of power electronic devices cannot be applied to analyze the resonance stability of power systems with other linear component models based on the linear system theory;meanwhile,a simple example is constructed to verify the statement above.

关 键 词：电力电子装置 频率耦合 阻抗模型 线性模型 谐振稳定性 谐波线性化 

分 类 号：TM712[电气工程—电力系统及自动化]