摘要
当含双馈感应发电机(DFIG)的交流电网发生故障时,DFIG输出特性的精确性将影响到整个故障网络计算结果的准确性。首先,从DFIG的不同电压跌落出发,详细推导了撬棒保护投入、转子侧变流器(RSC)励磁控制和外环控制下DFIG定子侧输出电流的计算公式。接着,考虑网侧变流器(GSC)的馈出电流,推导了GSC和RSC在不同控制策略下DFIG的输出电流表达式,进而提出了计及不同电压跌落和GSC馈出电流的DFIG精细化故障计算模型。最后,在MATLAB/Simulink平台中进行了DFIG并入无穷大系统和典型电网仿真来验证该精细化模型的准确性。仿真结果表明,所提精细化模型理论计算值与仿真值误差较小;与现有模型相比,该模型在应用于电网故障计算时具有更高的准确性。
When a fault occurs in an AC power grid containing doubly-fed induction generators(DFIGs),the accuracy of DFIG output characteristics will affect the calculation results of the entire faulty network.First,based on the different voltage drops of DFIG,the calculating formulas for the stator-side output current under crowbar protection operation,rotor-side converter(RSC)excitation control and outer loop control are derived in detail.Then,considering the feed-out currents of the grid-side converter(GSC),the output current expressions of DFIG with different control strategies of GSC and RSC are derived.Thus,the refined fault calculation model of DFIG considering different voltage drops and GSC feed-out currents is proposed.Finally,to verify the accuracy of the refined model,an infinite bus system and a typical power grid with DFIGs are simulated on the MATLAB/Simulink platform.The simulation results show that the error between the theoretical calculated and simulated values of the refined model is small.Compared with the existing models,the proposed model has higher accuracy when applied to power grid fault calculation.
作者
黄琛
黄超
李银红
HUANG Chen;HUANG Chao;LI Yinhong(School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;Guangxi Power Grid Power Dispatching and Control Center,Nanning 530023,China)
出处
《电力系统自动化》
EI
CSCD
北大核心
2023年第23期162-171,共10页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目(52207107)。
关键词
故障计算
双馈感应发电机
故障特性分析
电压跌落
网侧变流器
馈出电流
精细化模型
fault calculation
doubly-fed induction generator(DFIG)
fault characteristic analysis
voltage drop
grid-side converter(GSC)
feed-out current
refined model
