MPPT算法与输入输出反馈线性化控制技术在光伏发电系统中的应用
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摘要
针对目前光伏发电系统采用的固定电压法、增量电导法等最大功率点跟踪控制技术跟踪速度慢、精度不佳的问题,提出采用变步长电导增量法进行最大功率点跟踪控制;为了控制光伏系统中电网电流和直流母线电压,采用输入输出反馈线性化控制技术,使得系统的功率因数和直流母线电压可用相同的算法进行控制。在Matlab/Simulink环境下对基于变步长电导增量法算法与输入输出反馈线性化控制技术的光伏发电系统进行了建模仿真,结果表明,采用反馈线性化技术控制逆变器后,日照强度和温度变化不会对电网功率因数产生影响;变步长电导增量法提高了光伏发电系统的动态和稳态性能,且降低了电网电流的总谐波失真率。
In order to solve problems of slow tracking speed and poor accuracy of the maximum power point tracking technology such as fixed voltage method,incremental conductance method and so on used in photovoltaic power system at present,a variable step size incremental conductance algorithm was proposed.For controlling grid current and DC bus voltage of photovoltaic power system,a new method was design by use of input output feedback linearization control technology,which allows control of both power factor and DC bus voltage using the same control algorithm.The model of photovoltaic power system was established and simulated based on the variable step size incremental conductance algorithm and input-output feedback linearization control technology in Matlab/Simulink,and the results showed that using the input-output feedback linearization control technology to control inverter makes changes of solar irradiation and temperature do not affect power factor of power grid,and the variable step size incremental conductance improves dynamic and static performances of the photovoltaic power system and reduces the total harmonic distortion of current in the power grid.
In order to solve problems of slow tracking speed and poor accuracy of the maximum power point tracking technology such as fixed voltage method,incremental conductance method and so on used in photovoltaic power system at present,a variable step size incremental conductance algorithm was proposed.For controlling grid current and DC bus voltage of photovoltaic power system,a new method was design by use of input output feedback linearization control technology,which allows control of both power factor and DC bus voltage using the same control algorithm.The model of photovoltaic power system was established and simulated based on the variable step size incremental conductance algorithm and input-output feedback linearization control technology in Matlab/Simulink,and the results showed that using the input-output feedback linearization control technology to control inverter makes changes of solar irradiation and temperature do not affect power factor of power grid,and the variable step size incremental conductance improves dynamic and static performances of the photovoltaic power system and reduces the total harmonic distortion of current in the power grid.
引文
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[8]杨培志,张晓华,陈宏钧.三相电压型PWM整流器模型准线性化[J].电工技术学报,2007,22(8):28-35.
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[10]李啸骢,程时杰,韦化,等.输出函数在多输入多输出非线性控制系统设计中的重要作用[J].中国电机工程学报,2006,26(9):87-93.
[11]JUNG J,LIM S,NAM K.A feedback linearizingcontrol scheme for a PWM converter-inverter havinga very small DC-link capacitor[J].IEEE Transactionson Industry Applications,1999,35(5):1124-1131.
[12]LEE D C,LEE G M.DC-bus voltage control ofthree-phase AC/DC PWM converters using feedbacklinearization[J].IEEE Transactions on IndustryApplications,2000,36(3):826-833.
[2]COELHO R F,CONCER F,MARTINS D C.Astudy of the basic DC-DC converters applied inmaximum power point tracking[C]//PowerElectronics Conference,2009,Bonito-Mato Grosso doSul:673-678.
[3]ENRIQUE J M,ANDUJAR J M,BOHORQUEZ MA.A reliable,fast and low cost maximum powerpoint tracker for photovoltaic applications[J].SolarEnergy,2010,84(1):79-89.
[4]MOLINA M G,MERCADO P E.Modeling andcontrol of grid-connected photovoltaic energyconversion system used as a dispersed generator[C]//IEEE Transmission and Distribution Conference andExposition,2008,Bogota:13-15.
[5]JAIN S,AGARWAL V.New current control basedMPPT technique for single stage grid-connected PVsystems[J].Energy Conversion and Management,2007,48(7):625-644.
[6]HASSAINE L,OLIAS E,QUINTERO J,et al.Digital power factor control and reactive powerregulation for grid-connected photovoltaic inverter[J].Renewable Energy,2009,34(9):315-321.
[7]LI Jiyong,WANG Honghua.A novel stand-alonePV generation system based on variable step size INCMPPT and SVPWM control[C]//Power Electronicsand Motion Control Conference,2009,Wuhan:2155-2160.
[8]杨培志,张晓华,陈宏钧.三相电压型PWM整流器模型准线性化[J].电工技术学报,2007,22(8):28-35.
[9]HASSAN K K.Nonlinear system[M].3rd Ed.UpperSaddle River:Prentice Hall,2002:110-118.
[10]李啸骢,程时杰,韦化,等.输出函数在多输入多输出非线性控制系统设计中的重要作用[J].中国电机工程学报,2006,26(9):87-93.
[11]JUNG J,LIM S,NAM K.A feedback linearizingcontrol scheme for a PWM converter-inverter havinga very small DC-link capacitor[J].IEEE Transactionson Industry Applications,1999,35(5):1124-1131.
[12]LEE D C,LEE G M.DC-bus voltage control ofthree-phase AC/DC PWM converters using feedbacklinearization[J].IEEE Transactions on IndustryApplications,2000,36(3):826-833.