基于无源E-L模型的五电平逆变器并网控制策略
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摘要
目前从控制策略上研究五电平逆变器的研究较少。为此,将非线性的无源控制(PBC)理论应用于五电平逆变器的控制之中,该方法从能量成型的角度考虑控制系统的构造,且需要选取适当的能量函数与注入阻尼。首先根据五电平逆变器的拓扑结构及其开关函数推导出其数学模型;然后选取适当的能量函数与注入阻尼确定无源E-L模型控制器的开关函数,并将推导出的开关函数结合调制算法驱动并网系统。仿真和实验表明,相比于传统的PI控制,无源控制不但提高了系统的动、静态稳定性,还降低了逆变器输出电流谐波,提升了系统的经济性。
At present, the five-level inverter from the control strategy is rarely studied. Therefore, we apply the nonlinear passivity-based control(PBC) theory to the control of five-level inverters.In this method, the structure of control system is considered from the viewpoint of energy forming, and the selection of anappropriate energy function and injection damping is needed. Firstly, a mathematical model is deduced according to the topology of the five-level inverter and its switching function. Then, the mathematical model of the five-level inverter is transformed into the passive Euler-Lagrange(E-L) expression by selecting the appropriate energy function and injection damping, and the switching function is combined with modulation algorithm to drive the grid-connected system.Simulation and hardware experiments show that, compared with the traditional PI control, the passivity-based control not only improves the dynamic and static stability of the system, but also reduces the output current harmonics of the inverter and improves the economy of the system.
At present, the five-level inverter from the control strategy is rarely studied. Therefore, we apply the nonlinear passivity-based control(PBC) theory to the control of five-level inverters.In this method, the structure of control system is considered from the viewpoint of energy forming, and the selection of anappropriate energy function and injection damping is needed. Firstly, a mathematical model is deduced according to the topology of the five-level inverter and its switching function. Then, the mathematical model of the five-level inverter is transformed into the passive Euler-Lagrange(E-L) expression by selecting the appropriate energy function and injection damping, and the switching function is combined with modulation algorithm to drive the grid-connected system.Simulation and hardware experiments show that, compared with the traditional PI control, the passivity-based control not only improves the dynamic and static stability of the system, but also reduces the output current harmonics of the inverter and improves the economy of the system.
引文
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[14]程启明,张强,程尹曼,等.基于PCHD模型的光伏Z源并网逆变器无源控制[J].高电压技术,2016,42(9):2723-2732.CHENG Qiming,ZHANG Qiang,CHENG Yinman,et al.Passivity based control of PV Z-source grid-connected inverter based on PCHDmodel[J].High Voltage Technology,2016,42(9):2723-2732.
[15]王君瑞,钟彦儒,宋卫章.基于无源性与自适应降阶观测器的双馈风力发电机控制[J].中国电机工程学报,2011,31(33):159-168.WANG Junrui,ZHONG Yanru,SONG Weizhang.Doubly-fed induction generator control for wind power based on passivity and adaptively reduced order observer[J].Proceedings of the CSEE,2011,31(33):159-168.
[16]张百乐,王久和,赵凤娇.TNPC型光伏并网逆变器的PCHD建模与控制[J].中国电机工程学报,2014,34(34):204-210.ZHANG Baile,WANG Jiuhe,ZHAO Fengjiao.The PCHD model and control of TNPC PV grid-connected inverter[J].Proceedings of the CSEE,2014,34(34):204-210.
[17]FLOTA M,ALI B,VILLANUEVA C.Passivity-based control for a photovoltaic inverter with power factor correction and night operation[J].IEEE Latin America Transaction,2016,14(8):3569-3574.
[18]程启明,余德清,程尹曼,等.光伏Z源并网逆变器的非线性无源控制研究[J].太阳能学报,2018,39(10):2810-2820.CHENG Qiming,YU Deqing,CHENG Yinman,et al.Research on nonlinear passivity-based control for photovoltaic Z-source grid-connected inverter[J].Acta Energiae Solaris Sinica,2018,39(10):2810-2820.
[2]WANGH L,LEI K,LIU Y F.A new six-switch five-level active neutral point clamped inverter for PV applications[J].IEEE Transactions on Power Electronics,2017,32(9):6700-6715.
[3]李洪亮,姜建国,乔树通.三电平SVPWM与SPWM本质联系及对输出电压谐波的分析[J].电力系统自动化,2015,39(12):130-137.LI Hongliang,JIANG Jianguo,QIAO Shutong.Essential relation between three-level SVPWM and SPWM and analysis on output voltage harmonic[J].Automation of Electric Power Systems,2015,39(12):130-137.
[4]XU S,JIZ D.A study of the SPWM high-frequency harmonic circulating currents in modular inverters[J].Journal of Power Electronics,2016,16(6):2119-2128.
[5]NIU L,XUD G,YANG M,et al.On-line inertia identification algorithm for pi parameters optimization in speed loop[J].IEEETransactions on Power Electronics,2015,30(2):849-859.
[6]程启明,褚思远,程尹曼,等.Z源三电平并网逆变器的准PR控制系统[J].高电压技术,2016,42(10):3075-3082.CHENG Qiming,CHU Siyuan,CHENG Yinman,et al.Quasi-PR control system of grid-connected Z-source three-level inverter[J].High Voltage Technology,2016,42(10):3075-3082.
[7]ZHANGX G,SUNL Z,ZHAO K,et al.Nonlinear speed control for PMSM system using sliding-mode control and disturbance compensation techniques[J].IEEE Transactions on Power Electronics,2013,28(3):1358-1365.
[8]余德清,程启明,高杰,等.降电容电压型准Z源三电平逆变器及其恒功率并网控制[J].高电压技术,2018,44(4):1319-1327.YU Deqing,CHENG Qiming,GAO Jie,et al.Quasi Z-source three-level inverter with reduced capacitor voltage and its constant power grid-connected control[J].High Voltage Engineering,2018,44(4):1319-1327.
[9]何超杰,赵晋斌,杨旭红,等.弱电网下基于系统敏感度的逆变器自适应控制[J].电网技术,2017,41(1):238-244.HE Chaojie,ZHAO Jinbin,YANG Xuhong,et al.Adaptive control strategy for grid-connected inverter based on system sensitivity in weak grid[J].Power System Technology,2017,41(1):238-244.
[10]王晓刚,肖立业.Z源逆变器直流链电压滑模控制研究[J].电机与控制学报,2015,19(2):1-6.WANG Xiaogang,XIAO Liye.Sliding mode control for DC-link voltage of Z-source inverter[J].Journal of Electrical and Control,2015,19(2):1-6.
[11]范心明,管霖,夏成军,等.基于PCHD模型的柔性直流输电鲁棒控制[J].电力系统自动化,2013,37(15):40-46.FAN Xinming,GUAN Lin,XIA Chengjun,et al.PCHD based robust control of VSC-HVDC transmission based on port-controlled Hamiltonian with dissipation[J].Automation of Electric Power Systems,2013,37(15):40-46.
[12]李涛,程启明,程尹曼,等.基于E-L模型的Z源T型逆变器无源控制策略研究[J].电网技术,2018,42(7):2303-2311.LI Tao,CHENG Qiming,CHENG Yinman,et al.Research on passivity-basedcontrol strategy of Z-source T-type inverter based on E-Lmodel[J].Power System Technology,2018,42(7):2303-2311.
[13]钱甜甜,苗世洪,刘子文,等.基于PCHD模型的VSC-HVDC的无源控制与滑模控制[J].电工技术学报,2016,31(3):138-144.QIAN Tiantian,MIAO Shihong,LIU Ziwen,et al.Passive control and auxiliary sliding mode control strategy for VSC-HVDC system based on PCHD model[J].Journal of Electrical Engineering,2016,31(3):138-144.
[14]程启明,张强,程尹曼,等.基于PCHD模型的光伏Z源并网逆变器无源控制[J].高电压技术,2016,42(9):2723-2732.CHENG Qiming,ZHANG Qiang,CHENG Yinman,et al.Passivity based control of PV Z-source grid-connected inverter based on PCHDmodel[J].High Voltage Technology,2016,42(9):2723-2732.
[15]王君瑞,钟彦儒,宋卫章.基于无源性与自适应降阶观测器的双馈风力发电机控制[J].中国电机工程学报,2011,31(33):159-168.WANG Junrui,ZHONG Yanru,SONG Weizhang.Doubly-fed induction generator control for wind power based on passivity and adaptively reduced order observer[J].Proceedings of the CSEE,2011,31(33):159-168.
[16]张百乐,王久和,赵凤娇.TNPC型光伏并网逆变器的PCHD建模与控制[J].中国电机工程学报,2014,34(34):204-210.ZHANG Baile,WANG Jiuhe,ZHAO Fengjiao.The PCHD model and control of TNPC PV grid-connected inverter[J].Proceedings of the CSEE,2014,34(34):204-210.
[17]FLOTA M,ALI B,VILLANUEVA C.Passivity-based control for a photovoltaic inverter with power factor correction and night operation[J].IEEE Latin America Transaction,2016,14(8):3569-3574.
[18]程启明,余德清,程尹曼,等.光伏Z源并网逆变器的非线性无源控制研究[J].太阳能学报,2018,39(10):2810-2820.CHENG Qiming,YU Deqing,CHENG Yinman,et al.Research on nonlinear passivity-based control for photovoltaic Z-source grid-connected inverter[J].Acta Energiae Solaris Sinica,2018,39(10):2810-2820.
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