两级式单相光伏逆变器输入电压二倍频纹波抑制
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摘要
两级式单相光伏并网逆变器的输入电压呈二倍电网频率的脉动,使最大功率点跟踪效率严重下降。文章深入研究了基于直流母线电压前馈控制的输入电压二倍频纹波抑制策略。首先分析了输入电压二倍频纹波产生机理,然后构建了光伏变换器的小信号模型,并从闭环音频敏感系数的角度推导出前馈控制器的表达式。最后,通过一台280V·A的实验样机验证了理论分析的正确性。
The input voltage of the inverter pulsates with the double-line frequency in the two-stage single-phase PV grid-connected system, which reduces the maximum power point tracking(MPPT)efficiency seriously. In this paper, the input voltage double line frequency ripple(DLFR) suppression strategy based on DC-link voltage feedforward control is discussed in depth. Firstly, the generation mechanism of input voltage DLFR is analyzed. Then small signal model of photovoltaic converter is established, and the expression of feedforward controller is derived from the perspective of closed-loop audio susceptive coefficient. The correctness of theoretical analysis is verified by experiment results of a 280 V·A prototype.
The input voltage of the inverter pulsates with the double-line frequency in the two-stage single-phase PV grid-connected system, which reduces the maximum power point tracking(MPPT)efficiency seriously. In this paper, the input voltage double line frequency ripple(DLFR) suppression strategy based on DC-link voltage feedforward control is discussed in depth. Firstly, the generation mechanism of input voltage DLFR is analyzed. Then small signal model of photovoltaic converter is established, and the expression of feedforward controller is derived from the perspective of closed-loop audio susceptive coefficient. The correctness of theoretical analysis is verified by experiment results of a 280 V·A prototype.
引文
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[3]黄庆丰,杨红培,翟登辉.基于Simulink的两级式单相光伏逆变器的系统仿真[J].电力系统保护与控制,2014,42(19):58-61.
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[6]候虚虚,秦岭,茅靖峰,等.两级式单向光伏并网逆变器输入电压PI+QPR鲁棒控制器设计[J].电网技术,2017,41(9):2910-2918.
[7] Lyu Jianguo,Hu Wenbin,Yao Kai,et al.Research on input current ripple reduction of two-stage single-phase PV grid inverter[A]. 2014 16th European Conference on Power Electronics and Applications[C].Lappeenranta:IEEE,2014.1-8.
[8] J Viinam覿ki,J Jokipii,T Suntio.Improving doubleline-frequency voltage ripple rejection capability of DC/DC converter in grid connected two-stage PV inverter using DC-link voltage feedforward[A].Proceedings of18th European Conference on Power Electronics and Applications(EPE'16 ECCE Europe)[C].Karlsruhe:IEEE,2016.1-10.
[9] L Qin,S Xie,C Yang,et al.Design method of input voltage robust PI controller for PV interface converter[A].Proceedings of International Conference on Renewable Power Generation(RPG 2015)[C].Beijing:IET, 2015.1-6.
[2]王峰,樊轶,龚春英.一种单相两级式光伏并网逆变器控制策略[J].电力电子技术,2013,47(5):53-55.
[3]黄庆丰,杨红培,翟登辉.基于Simulink的两级式单相光伏逆变器的系统仿真[J].电力系统保护与控制,2014,42(19):58-61.
[4] Wu T F,Chang C H,Lin L C,et al.Power loss comparison of single and two-stage grid-connected photovoltaic systems[J].IEEE Transactions on Energy Conversion,2011,26(2):707-715.
[5] Ertasgin G,Whaley D M,Ertugrul N,et al.Energy storage element sizing for single-phase grid-connected photovoltaic converter[A].2014 16th International Power Electronics and Motion Control Conference and Exposition[C].Antalya:IEEE,2014:1005-1010.
[6]候虚虚,秦岭,茅靖峰,等.两级式单向光伏并网逆变器输入电压PI+QPR鲁棒控制器设计[J].电网技术,2017,41(9):2910-2918.
[7] Lyu Jianguo,Hu Wenbin,Yao Kai,et al.Research on input current ripple reduction of two-stage single-phase PV grid inverter[A]. 2014 16th European Conference on Power Electronics and Applications[C].Lappeenranta:IEEE,2014.1-8.
[8] J Viinam覿ki,J Jokipii,T Suntio.Improving doubleline-frequency voltage ripple rejection capability of DC/DC converter in grid connected two-stage PV inverter using DC-link voltage feedforward[A].Proceedings of18th European Conference on Power Electronics and Applications(EPE'16 ECCE Europe)[C].Karlsruhe:IEEE,2016.1-10.
[9] L Qin,S Xie,C Yang,et al.Design method of input voltage robust PI controller for PV interface converter[A].Proceedings of International Conference on Renewable Power Generation(RPG 2015)[C].Beijing:IET, 2015.1-6.