基于滑模控制的新型双准Z源NPC型五电平逆变器并网控制策略
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摘要
针对传统双Z源二极管箝位(NPC)型五电平逆变器的Z源网络电感启动电流过大、升压能力有限等问题,提出一种新型的双准Z源NPC型五电平逆变器拓扑结构。用一种新型的双准Z源结构代替传统的双Z源结构,能够降低近2/3的Z源网络电感启动电流,提升逆变器直流侧电压接近2倍。将滑模控制应用到准Z源五电平逆变器系统的控制中,该方法无需线性化处理,只需通过系统数学模型就可推导出适当的控制规律。分析新型双准Z源五电平逆变器拓扑的工作原理;应用状态空间法和小信号模型对准Z源五电平并网系统进行数学模型推导和分析,并进行滑模控制器的设计;仿真和硬件实验结果表明,与传统比例-积分(PI)控制相比,滑模控制能够显著提高系统稳定性,降低电流谐波。
A new topology of the five-level NPC dual quasi-Z-source inverter is proposed to overcome the problems of the traditional five-level NPC( Neutral-Point-Clamped) dual Z-source inverter,such as excessive starting current of Z-source inductors and limited boosting ability. In comparison with the traditional topology,the new topology can effectively reduce the start current of the inductor of Z-source network by nearly two thirds,and double improve the DC-side voltage of the inverter. The proposed sliding mode control is applied to the control of quasi-Z-source fivelevel inverter system,in which the linearization can be avoided and only appropriate control law is required to be derived based on the mathematical model of the system. Firstly,the working principle of this new five-level NPC dual quasi-Z-source inverter topology is analyzed. Subsequently,the state space method and small signal model are applied to the Z-source five-level grid-connected system for mathematical model derivation and analysis. Meanwhile,the sliding mode controller is designed. Finally,the simulative and hardware experimental results show that the sliding mode control significantly improves the stability of the system and reduces the current harmonics compared with traditional PI( Proportional-Integral) control.
A new topology of the five-level NPC dual quasi-Z-source inverter is proposed to overcome the problems of the traditional five-level NPC( Neutral-Point-Clamped) dual Z-source inverter,such as excessive starting current of Z-source inductors and limited boosting ability. In comparison with the traditional topology,the new topology can effectively reduce the start current of the inductor of Z-source network by nearly two thirds,and double improve the DC-side voltage of the inverter. The proposed sliding mode control is applied to the control of quasi-Z-source fivelevel inverter system,in which the linearization can be avoided and only appropriate control law is required to be derived based on the mathematical model of the system. Firstly,the working principle of this new five-level NPC dual quasi-Z-source inverter topology is analyzed. Subsequently,the state space method and small signal model are applied to the Z-source five-level grid-connected system for mathematical model derivation and analysis. Meanwhile,the sliding mode controller is designed. Finally,the simulative and hardware experimental results show that the sliding mode control significantly improves the stability of the system and reduces the current harmonics compared with traditional PI( Proportional-Integral) control.
引文
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[15]RAJAEL A H,KABOLI S,EMADI A.Sliding-mode control of Z-source inverter[C]∥IEEE Industrial Electronics Society.Orlando,Florida,USA:IEEE,2008:947-952.
[16]UMESH K,SUMANT G,GAWANDE S P.Sliding mode control of single-phase grid-connected quasi-Z-source inverter[J].IEEE Access,2017,5(10):10232-10240.
[17]DEHKORDI N M,SADATI N,HAMZEH M.A robust backstepping high-order sliding mode control strategy for grid-connected DG units with harmonic/interharmonic current compensation capability[J].IEEE Transactions on Sustainable Energy,2017,8(2):561-572.
[18]FLOREZ-TAPIA A M,FEDERICO I M,JAVIER V.Small signal modeling and transient analysis of a trans quasi-Z-source inverter[J].Electric Power Systems Research,2017,144(10):52-62.
[2]刘孝辉,郑建勇,尤鋆,等.开关电感型Quasi-Z源逆变器[J].电力自动化设备,2011,31(9):65-68.LIU Xiaohui,ZHENG Jianyong,YOU Jun,et al.Switching inductive Quasi-Z-source inverter[J].Electric Power Automation Equipment,2011,31(9):65-68.
[3]BANAEI M R,OSKOUEI A B,DEHGHANZADEH A.Extended switching algorithms based space vector control for five-level quasi-Z-source inverter with coupled inductors[J].IET Power Electronics,2014,7(6):1509-1518.
[4]WANG Xiaogang,ZHANG Jie.Neutral-point potential balancing method for switched-inductor Z-source three-level inverter[J].Journal of Electrical Engineering&Technology,2017,12(3):1203-1210.
[5]YU Deqing,CHENG Qiming,GAO Jie,et al.Three-level neutral-pointclamped quasi-Z-source inverter with reduced Z-source capacitor voltage[J].IET Electronics Letters,2017,53(3):185-187.
[6]BAYHN S,KAKOSIMOS P,ABU-RUB H.Model predictive control of five-level H-bridge neutral-point-clamped q ZS inverter[C]∥Conference of the IEEE Industrial Electronics Society.Florence,Italy:IEEE,2016:5971-5976.
[7]BAYHAN S,TRABELSI M,ELLABBAN O.A five-level neutral-pointclamped/H-bridge quasi-impedance source inverter for grid connected PV system[C]∥Conference of the IEEE Industrial Electronics Society.Florence,Italy:IEEE,2016:2502-2507.
[8]支娜,肖曦,田培根,等.微网群控制技术研究现状与展望[J].电力自动化设备,2016,36(4):107-115.ZHI Na,XIAO Xi,TIAN Peigen,et al.Research and prospect of multi-microgrid control strategies[J].Electric Power Automation Equipment,2016,36(4):107-115.
[9]NIU Li,XU Dianguo,YANG Ming,et al.On-line inertia identification algorithm for PI parameters optimization in speed loop[J].IEEE Transactions on Power Electronics,2015,30(2):849-859.
[10]HARNEFORS L,YEPES A G,VIDAL A,et al.Passivity-based controller design of grid-connected VSCs for prevention of electrical resonance instability[J].IEEE Transactions on Industrial Electronics,2015,62(2):702-710.
[11]方支剑,段善旭,陈天锦,等.储能逆变器预测控制误差形成机理及其抑制策略[J].中国电机工程学报,2013,33(30):1-9,19.FANG Zhijian,DUAN Shanxu,CHEN Jintian,et al.Formation mechanism and suppression strategy of prediction control error applied in a battery energy storage inverter[J].Proceedings of the CSEE,2013,33(30):1-9,19.
[12]杜强,高锋阳,乔垚,等.功率前馈的准Z源光伏并网逆变器Quasi-PR控制[J].高电压技术,2017,43(9):1-7.DU Qiang,GAO Fengyang,QIAO Yao,et al.Quasi-PR control strategy for quasi-Z source PV grid-connected inverter based on power feed-forward[J].High Voltage Engineering,2017,43(9):1-7.
[13]LI Tao,CHENG Qiming,SUN Weisha,et al.Grid-connected control strategy of five-level inverter based on passive E-L model[J].Energies,2017,10(10):1-14.
[14]游国栋,李继生,侯勇,等.单相光伏并网逆变器的反步滑模控制策略[J].电网技术,2015,39(4):916-923.YOU Guodong,LI Jisheng,HOU Yong,et al.A back-stepping sliding mode control strategy for single-phase photovoltaic grid-connected inverter[J].Power System Technology,2015,39(4):916-923.
[15]RAJAEL A H,KABOLI S,EMADI A.Sliding-mode control of Z-source inverter[C]∥IEEE Industrial Electronics Society.Orlando,Florida,USA:IEEE,2008:947-952.
[16]UMESH K,SUMANT G,GAWANDE S P.Sliding mode control of single-phase grid-connected quasi-Z-source inverter[J].IEEE Access,2017,5(10):10232-10240.
[17]DEHKORDI N M,SADATI N,HAMZEH M.A robust backstepping high-order sliding mode control strategy for grid-connected DG units with harmonic/interharmonic current compensation capability[J].IEEE Transactions on Sustainable Energy,2017,8(2):561-572.
[18]FLOREZ-TAPIA A M,FEDERICO I M,JAVIER V.Small signal modeling and transient analysis of a trans quasi-Z-source inverter[J].Electric Power Systems Research,2017,144(10):52-62.