面向电网故障快速仿真分析的双馈风机等效建模方法

An Equivalent Modeling Method of DFIG for Rapid Simulation and Analysis of Power Grid Faults

中文关键词:双馈风机  变流器  等效模型  快速仿真  电网故障

keywords:doubly-fed induction generator （DFIG）  converter  equivalent model  fast simulation  grid fault

中文摘要:针对双馈风机中变流器开关特性导致电网故障仿真计算量大、仿真效率低的问题，提出一种基于变流器外特性等效的双馈风机快速仿真方法。首先，分析了变流器特性，提出将变流器等效为控制作用下的功率平衡元件；其次，提出了保留控制特性的变流器等效建模方法，包括受控特性和功率平衡的等效方法；最后，在满足各种条件下外特性基本一致的前提下，实现了变流器等效替代。基于专业仿真软件，对比等效模型和详细模型在计算中的特性，仿真结果表明所提方法计算量小、仿真计算效率高。

Abstract:To address large computational load and low simulation efficiency in power grid fault simulation caused by the switching characteristics of converters in doubly-fed induction generators （DFIGs），a fast simulation method for DFIGs based on the external characteristic equivalence of converters is proposed. First，the characteristics of the converter are analyzed，and the converter is proposed to be equivalent to a power balance component under control action. Second，a converter equivalent modeling method that retains the control characteristics is put forward，including the equivalent methods for controlled characteristics and power balance. Finally，on the premise that the external characteristics are basically consistent under various conditions，the equivalent replacement of the converter is realized. Based on professional simulation software，the calculation characteristics of the equivalent model and the detailed model are compared. The simulation results show that the proposed method has the advantages of small computational load and high simulation efficiency.