基于可调虚拟阻抗的微网逆变器谐波抑制策略研究
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摘要
逆变器中电力电子元件广泛的应用,产生大量谐波,严重影响微电网的电能质量。本文对并网逆变器谐波抑制方法展开研究,提出改进的三相电压型逆变器控制策略。该控制策略在传统双环控制基础上增加基于二阶广义积分器合成的可调虚拟阻抗环,能够快速跟踪电流信号,抑制信号噪声,快速准确的合成可调虚拟阻抗,减少逆变器输出电压的谐波含量。在电压控制回路中采用准比例谐振控制器,替代传统PI控制器,实现对正弦信号的快速、实时跟踪,改善系统的控制效果。通过Matlab/Simulink搭建系统仿真模型进行验证。仿真结果表明本文提出的改进控制策略能够有效地减少微电网谐波电压含量,改善电能质量。
引文
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[3]徐飞,汤雨,谷伟.弱电网条件下LCL型并网逆变器谐振前馈控制策略研究[J].中国电机工程学报,2016,(18):4970-4979.
[4]D.Pan,X.Ruan,C.Bao,et al.Optimized controller design for-type grid-connected inverter to achieve high robustness against grid-impedance variation[J].IEEE Transactions on Industrial Electronics,2015,62(3):1537-1547.
[5]刘鹏飞,卓菡.带LCL滤波的并网逆变器的比例谐振控制[J].电气技术,2013,(01):59-61.
[6]王迎昌,王毅,邢浩江,李海洋.光伏并网逆变器的谐波电流抑制研究[J].电力电子技术,2013,(01):46-48.
[7]X.Xie,Y.Jia,C.Hu,et al.An enhanced microgrid power sharing strategy based on multiple second order generalized integrators harmonic detection and adaptive virtual impedance[C]//IEEE PES Asia-Pacific Power and Energy Engineering Conference.IEEE,2016:2343-2347.
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[9]W.Wang,X.Zeng,X.Tang,et al.Analysis of microgrid inverter droop controller with virtual output impedance under non-linear load condition[J].IET Power Electronics,2014,7(6):1547-1556.
[10]霍逸群,刘维亭,魏海峰.一种基于瞬时无功功率理论的电网谐波电流检测方法[J].自动化技术与应用,2016,(03):83-87.
[11]Y.Huang,A.Luo,Z.Chen.A harmonic control strategy for three-phase grid-connected inverter with LCL filter under distorted grid conditions[C]//IEEE,International Power Electronics and Motion Control Conference.IEEE,2016:967-973.
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