基于MATLAB的变压器空载合闸瞬变过程仿真研究

MATLAB黄绍平,李永坚(湖南工程学院电气与信息工程系,湖南湘潭411101):变压器空载合闸投入运行时会出现一个较为复杂的电磁瞬变过程,对其进行工程计算很麻烦利用MATLAB中的电气系统模块库(PSB),为研究分析变压器空载合闸瞬变过程建立了系统仿真模型,它可以分析变压器在空载合闸瞬变过程中励磁涌流磁通以及谐波的变化情况本文采用这一模型进行了仿真,给出了仿真结果,为分析计算变压器空载合闸瞬变过程中的有关物理量提供了便捷而有效的手段:变压器;励磁涌流;电气系统模块库;仿真:TM743:A:1003-4897(2004)08-0019-030,,,,,,,;,,,,,,MATLAB,1MATLABPSBMathworksMATLAB,,1998MATLABVersion5.2,PSB(PowerSystemBlock),PSBMATLABSimulinkMATLABPSBSimulink,6:1);2)()RLC//N0;3)GTOMOSFET;4);5)();6)6,,,PSB(PowerlibExtras)6:22.1MATLABPSB1,Fourier()MATLABPSB193282004416继电器RELAYVol.32No.8Apr.16,20041Fig.1Systemmodel1500kV60Hz,450MVA,Y0/Y0/$,500/315/60kV,60Hz3000MVA,5.558,0.22H,,50MW,188Mvar,,,1,AUa2K=1/(2PfUa2m),Ua2mUa2,(),1,Va1(K=1/Ua1m,Ua1mUa1)Ua1,Va1Ua1Ua1Fourier(),,Va1_h4Ua14Fourier,,Iabc,,,2.22,RmLsat,32Fig.2Circuitmodeloftransformer3Fig.3Saturationcharacteristiccurveoftransformer,():R1=0.002,X1=0.08,R2=0.20继电器002,X2=0.08,R3=0.015,X3=0.30,Rm=500,(3123)[i1=0,51=0;i2=0.0,52=1.2;i3=1.0,53=1.52],5A0=0.8,5B0=-0.4,5C0=0.44Fig.4Simulationwaveforms3,5(a)~(d)144(,,)A0.8(),,A2,22000A,(520A)44,44MATLAB,,,SimulinkPSBMATLAB,,:[1](HUANGZhong-lin).MATLAB(CalculationandSimulationofControlSystemBasedonMATLAB)[M].:(Beijing:NationalDefenceIndustryPress),2001.:2003-10-08;:2003-11-20:黄绍平(1964-),男,工程硕士,副教授,从事电力系统及其自动化的教学与研究工作,目前的研究方向为无功补偿智能化开关设备MATLAB-basedsimulationofinstantaneouschangeprocesswhentransformerno-loadswitchingHUANGShao-ping,LIYong-jian(HunanInstituteofEngineering,Xiangtan411101,China)Abstract:Acomplicatedelectromagneticinstantaneouschangeprocesswillappearwhentransformerno-loadswitching,whichiscomplicatedtocalculateelectromagneticquantities.Usingpowersystemblockset(PSB)ofMATLAB,asimulationmodelofanalysinginstantaneouschangeprocessisbuiltwhentransformerno-loadswitching.Itcananalysethevarietiesofinrushcurrent,fluxandharmonicintheinstantaneouschangeprogress.Usingthismodel,asimulationisaccomplished,andtheresultisgiven.Thismethodisafacileandeffectivemeansforanalysingandcalculatingelectromagneticquantitiesduringinstantaneouschangeprocesswhentransformerno-loadswitching.Keywords:transformer;inrushcurrent;powersystemblockset(PSB);simulation21,MATLAB