电力系统机电暂态仿真的变频器负荷等值建模研究

Research on Equivalent Modeling of Variable Frequency Drive Loads for Electromechanical Transient Simulation in Power Systems

中文关键词:负荷建模  变频器  机电暂态仿真

keywords:load modeling  variable frequency drive  electromechanical transient simulation

中文摘要:针对当前大电网机电暂态仿真中缺少变频器负荷相关模型的问题，提出了一种变频器负荷机电暂态降阶等值模型。分析了变频器负荷的电路结构和运行原理，于仿真软件中搭建立了变频器负荷的电磁暂态仿真模型，研究其暂态响应的主导物理过程。基于此，提出了一种适用于电力系统机电暂态仿真的变频器负荷降阶等值模型，给出了模型的关键参数及辨识方法。通过不同场景下的仿真与动模试验，验证了所提等值模型可以准确描述变频器负荷的动态特性，且具备模型普适性，亦验证了所给参数辨识方法的准确性。

Abstract:To address the lack of variable-frequency drives （VFDs） load models in large-scale power system electromechanical transient simulation， a reduced-order equivalent electromechanical transient model for VFDs loads is proposed in this paper. The circuit structure and operation principle of VFD loads are analyzed， and an electromagnetic transient simulation model of VFD loads is established in the simulation software to study the dominant physical process of its transient response. On this basis， a reduced-order equivalent model of VFD loads suitable for electromechanical transient simulation of power systems is proposed， and the key parameters and identification method of the model are given. Simulations and dynamic physical tests under different scenarios verify that the proposed equivalent model can accurately describe the load characteristics of VFD loads and has universal applicability， and the accuracy of the proposed parameter identification method is also verified.