高阶无源滤波器对比分析
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摘要
利用回路电流法推导了现有的LCL、LLCL、LCCL、LLCCL、L(LCL)_2型滤波器逆变器侧电压到电网侧电流的传递函数。对于这5种高阶无源滤波器,在幅频域下,从谐波抑制效果和谐振特性两方面分别进行深入研究。利用R_d和R_d-C_d阻尼法对高阶滤波器可能存在的谐振点进行谐振抑制,针对含有双并联谐振支路的高阶无源滤波器进行不同支路阻尼效果对比分析,并确定最佳阻尼支路。通过仿真对理论分析的正确性进行验证,表明L(LCL)_2型滤波器谐波抑制效果最佳,同时可以缩小器件尺寸并降低器件的成本造价。
The inverter side voltage to grid side current transfer functions of the existing LCL,LLCL,LCCL,LLCCL and L(LCL)_2 filters are derived by loop current method. The harmonic suppression effect and resonance characteristics of these five high-order passive filters are deeply studied in amplitude-frequency domain. The possible resonance points of the high-order filter are suppressed by R_d and R_d-C_d damping methods. The different branch damping effects for high-order passive filters with double parallel resonant branches are comparatively analyzed,and the optimal damping branch is determined. The correctness of theoretical analysis is verified by simulation,which shows that the L(LCL)_2 filter has the best harmonic suppression effect while reducing the size and cost of the device.
The inverter side voltage to grid side current transfer functions of the existing LCL,LLCL,LCCL,LLCCL and L(LCL)_2 filters are derived by loop current method. The harmonic suppression effect and resonance characteristics of these five high-order passive filters are deeply studied in amplitude-frequency domain. The possible resonance points of the high-order filter are suppressed by R_d and R_d-C_d damping methods. The different branch damping effects for high-order passive filters with double parallel resonant branches are comparatively analyzed,and the optimal damping branch is determined. The correctness of theoretical analysis is verified by simulation,which shows that the L(LCL)_2 filter has the best harmonic suppression effect while reducing the size and cost of the device.
引文
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[2] SHUAI Zhikang,LIU Dingguo,SHEN J,et al.Series and parallel resonance problem of wideband frequency harmonic and its elimination strategy[J].IEEE Transactions on Power Electronics,2014,29(4):1941-1952.
[3] SHEN Guoqiao,XU Dehong,CAO Luping,et al.An improved con-trol strategy for grid-connected voltage source inverters with an LCL filter[J].IEEE Transactions on Power Electronics,2008,23(4):1899-1906.
[4] 魏伟,许胜辉,孙剑波.一种无源滤波器的优化设计方法[J].电力自动化设备,2012,32(1):62-66.WEI Wei,XU Shenghui,SUN Jianbo.Optimal design of passive filter[J].Electric Power Automation Equipment,2012,32(1):62-66.
[5] 王少杰,罗安.配电网低压大电流负荷的谐波与无功补偿装备研制[J].电力自动化设备,2010,30(12):25-29,41.WANG Shaojie,LUO An.Development of harmonics and var compensation equipment for distribution grid with low-voltage high-current load[J].Electric Power Automation Equipment,2010,30(12):25-29,41.
[6] 刘宝泉,郭华,朱一昕,等.三相变流器无源阻尼型LCL滤波器的分析与设计[J].电工技术学报,2017,32(2):195-205.LIU Baoquan,GUO Hua,ZHU Yixin,et al.Analysis and design of a passively damping LCL filter in three-phase converters[J].Tran-sactions of China Electrotechnical Society,2017,32(2):195-205.
[7] 张学广,刘义成,王瑞,等.一种新型的PWM变换器LCL滤波器有源阻尼控制策略[J].电工技术学报,2011,26(10):188-192.ZHANG Xueguang,LIU Yicheng,WANG Rui,et al.A novel active damping control strategy for PWM converter with LCL filter[J].Transactions of China Electrotechnical Society,2011,26(10):188-192.
[8] LIU Z,WU H,LIU Y,et al.Modelling of the modified-LLCL-filter-based single-phase grid-tied Aalborg inverter[J].IET Power Electronics,2017,10(2):151-155.
[9] WU W,SUN Y,LIN Z,et al.A modified LLCL filter with the reduced conducted EMI noise[J].IEEE Transactions on Power Electronics,2014,29(7):3393-3402.
[10] FANG Jingyang,LI Hongchang,TANG Yi,et al.A magnetic integrated LLCL filter for grid-connected voltage-source converters[J].IEEE Transactions on Power Electronics,2017,32(3):1725-1730.
[11] 方旌扬,肖国春,郑力夫,等.一种LCCL滤波器及其在半桥电力有源滤波器中的应用[J].电工技术学报,2016,31(22):125-136.FANG Shengyang,XIAO Guochun,ZHENG Lifu,et al.An LCCL filter for a half-bridge active power filter[J].IEEE Transactions on Power Electronics,2016,31(22):125-136.
[12] 许德志,汪飞,阮毅.LCL、LLCL和LLCCL滤波器无源阻尼分析[J].中国电机工程学报,2015,35(18):4725-4735.XU Dezhi,WANG Fei,RUAN Yi.Passive damping of LCL,LLCL and LLCCL filters[J].Proceedings of the CSEE,2015,35(18):4725-4735.
[13] ANZALCHI A,MOGHADDAMI M,MOGHADASI A,et al.A new topology of higher order power filter for single-phase grid-tied voltage-source Inverters[J].IEEE Transactions on Industrial Electronics,2016,63(12):7511-7522.
[14] LIU Bangyin,WEI Qikang,ZOU Changyue,et al.Stability analysis of LCL-type grid-connected inverter under single-loop inverter-side current control with capacitor voltage feedforward[J].IEEE Tran-sactions on Industrial Informatics,2018,14(2):691-702.
[15] WU Weimin,HE Yuanbin,BLAABJERG F.An LLCL power filter for single-phase grid-tied inverter[J].IEEE Transactions on Power Electronics,2012,27(2):782-789.
[16] ANZALCHI A,MOGHADDAMI M,MOGHADASI A,et al.Design and analysis of a higher order power filter for grid-connected rene-wable energy systems[J].IEEE Transactions on Industry Applications,2017,53(5):4149-4161.
[17] 高键鑫,吴旭升,高嵬,等.一种基波电流补偿高次谐波电流的LCCL谐振结构参数设计方法[J].电力自动化设备,2018,38(6):201-207.GAO Jianxin,WU Xusheng,GAO Wei,et al.Design method of fundamental current compensating harmonic current parameters for LCCL resonant structure[J].Electric Power Automation Equipment,2018,38(6):201-207.
[18] 许德志,汪飞,阮毅,等.并网接口滤波器拓扑结构推演与分析[J].电工技术学报,2015,30(4):15-25.XU Dezihi,WANG Fei,RUAN Yi.et al.Topology deduction and analysis of grid-interfacing filters[J].IEEE Transactions on Power Electronics,2015,30(4):15-25.
[19] BERES R N,WANG X,LISERRE M.A review of passive power filters for three-phase grid-connected voltage-source converters[J].IEEE Journal of Emerging and Selected Topics in Power Electronics,2016,4(1):54-69.