全功率风电变流器网侧LLCL滤波器设计方法
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摘要
为了保持电网的电能品质,对于并网型风电变流器,要求对电网侧逆变器设计滤波器以保证入网电流总谐波畸变率(THD)和单次谐波含量均满足相关并网标准。对比L、LCL和LLCL滤波器传递函数幅频特性,定性分析了三种滤波器在各频段、特别是开关频率附近的谐波抑制能力,得出LLCL滤波器的优点,并针对MW级全功率风电变流器引入了LLCL滤波器的设计。根据并网型风电机组拓扑结构特点,给出了LLCL滤波器参数设计方法,并分析了新型滤波器拓扑结构下的电网侧阻抗特性及控制系统稳定性。实例仿真验证表明,相比于LCL滤波器,LLCL滤波器可以在采用更小的变流器输出滤波电感的情况下,保持其他频率点性能基本不变且开关频率附近的谐波得到更好的抑制。
In order to keep a good quality for power supply, a grid side filter for grid-connected converter of wind turbine is required to make the total harmonic distribution(THD) and single-order harmonic content of current connected to the grid to meet with related grid standards. In this paper, the amplitude frequency characteristics of transfer function of L filter, LCL filter and LLCL filter are compared with each other. The advantage of LLCL filter is found by qualitative analyzing the harmonic suppression ability in different frequency bands, especially the switching frequency of these three types of filter. Based on the character oftopological structure of the grid-connected wind turbine, a design method for LLCL filter is improved. The grid side impedance characteristic and the stability of control system of the novel filter are analyzed. Finally the result of simulating shows that the LLCL filter has better harmonic suppression performancenearby the switching frequencythan the LCL tilter with smaller converter output filter inductor.
In order to keep a good quality for power supply, a grid side filter for grid-connected converter of wind turbine is required to make the total harmonic distribution(THD) and single-order harmonic content of current connected to the grid to meet with related grid standards. In this paper, the amplitude frequency characteristics of transfer function of L filter, LCL filter and LLCL filter are compared with each other. The advantage of LLCL filter is found by qualitative analyzing the harmonic suppression ability in different frequency bands, especially the switching frequency of these three types of filter. Based on the character oftopological structure of the grid-connected wind turbine, a design method for LLCL filter is improved. The grid side impedance characteristic and the stability of control system of the novel filter are analyzed. Finally the result of simulating shows that the LLCL filter has better harmonic suppression performancenearby the switching frequencythan the LCL tilter with smaller converter output filter inductor.
引文
[1]Remus Teodorescu.周克亮,王政,徐青山,译.光伏与风力发电系统并网变换器[M].北京:机械工业出版社,2012.
[2]张兴,张崇巍.PWM整流器及其控制[M].北京:机械工业出版社,2012.
[3]WANG Han,YU Chenzhao,ZHANG Jianwen,et al.Control of voltage source inverter with an LCL filter without voltage sensors[J].Przeglad Elektrotechniczny,2012(5):119-122.
[4]王要强.LCL滤波的并网逆变系统及其适应复杂电网环境的控制策略[D].哈尔滨:哈尔滨工业大学,2013.WANG Yaoqiang.LCL filtered parallel inverter system and its control strategy for complex grid environment[D].Haerbin:Harbin Institute of Technology,2013.
[5]RajendraAparnathi,VedVyas Diwedi.Study of the LCL filter for three phase inverter in higher stability for the active damping method using genetic algorithm base[J].International Journal of Advancements in Technology,2013,4(1):36-49.
[6]陈新,韦徵,胡雪峰,等.三相并网逆变器LCL滤波器的研究及新型有源阻尼控制[J].电工技术学报,2014,29(6):71-78.CHEN Xin,WEI Hui,HU Xuefeng,et al.Research on LCL filter of three-phase gridconnected inverter and new active damping control[J].Transactions of China Electrotechnical Society,2014,29(6):71-78.
[7]郜阳.并网光伏发电中输出滤波器的研究[D].成都:西南交通大学,2013.GAO Ya n g.Research on output filter ingrid-connected photo voltaic power generation[D].Chengdu:Southwest Jiaotong University,2013.
[8]赵争鸣,袁立强,鲁挺,等.我国大容量电力电子技术与应用发展综述[J].电气工程学报,2015,10(4):26-34.ZHAO Zhengming,YUAN Liqiang,LU Ting,et al.Summary of the development of large capacity power electronics technology and application in China[J].Journal of Electrical Engineering,2015,10(4):26-34.
[9]Weimin Wu,Yuanbin He,Tianhao Tang.A new design method for the passive damped LCL and LLCLfilter-based single-phase grid-tied inverter[J].IEEETransactions on Industrial Electronics,2013,60(10):4339-4350.
[10]Weimin Wu,Zhe Lin,Yunjie Sun,et al.A hybrid damping method for LLCL-filter based grid-tied inverter with a digital filter and an RCparallel passive damper[J].2013 IEEE Energy Conversion Congress and Exposition,2013:456-463.
[11]邱晓明,王明渝,胡文翠.LLCL滤波的单相光伏并网逆变器控制技术研究[J].电力系统保护与控制,2013,41(10):74-79.QIU Xiaoming,WANG Mingyu,HU Wencui.Research on control technology of LLCL filtered single-phase photovoltaic grid-connected inverter[J].Power System Protection and Control,2013,41(10):74-79.
[12]魏星,肖岚,姚志垒,等.三相并网逆变器的LCL滤波器设计[J].电力电子技术,2010,44(11):13-15.WEI Xing,XIAO Lan,YAO Zhilei,et al.Design of LCL filter for three-phase grid-connected inverters[J].Power Electronics,2010,44(11):13-15.
[13]Liu F,Zha X,Duan S.Three-phase inverter with LCL filter design parameters and research[J].Electric Power Systems,2010(3):110-115.
[2]张兴,张崇巍.PWM整流器及其控制[M].北京:机械工业出版社,2012.
[3]WANG Han,YU Chenzhao,ZHANG Jianwen,et al.Control of voltage source inverter with an LCL filter without voltage sensors[J].Przeglad Elektrotechniczny,2012(5):119-122.
[4]王要强.LCL滤波的并网逆变系统及其适应复杂电网环境的控制策略[D].哈尔滨:哈尔滨工业大学,2013.WANG Yaoqiang.LCL filtered parallel inverter system and its control strategy for complex grid environment[D].Haerbin:Harbin Institute of Technology,2013.
[5]RajendraAparnathi,VedVyas Diwedi.Study of the LCL filter for three phase inverter in higher stability for the active damping method using genetic algorithm base[J].International Journal of Advancements in Technology,2013,4(1):36-49.
[6]陈新,韦徵,胡雪峰,等.三相并网逆变器LCL滤波器的研究及新型有源阻尼控制[J].电工技术学报,2014,29(6):71-78.CHEN Xin,WEI Hui,HU Xuefeng,et al.Research on LCL filter of three-phase gridconnected inverter and new active damping control[J].Transactions of China Electrotechnical Society,2014,29(6):71-78.
[7]郜阳.并网光伏发电中输出滤波器的研究[D].成都:西南交通大学,2013.GAO Ya n g.Research on output filter ingrid-connected photo voltaic power generation[D].Chengdu:Southwest Jiaotong University,2013.
[8]赵争鸣,袁立强,鲁挺,等.我国大容量电力电子技术与应用发展综述[J].电气工程学报,2015,10(4):26-34.ZHAO Zhengming,YUAN Liqiang,LU Ting,et al.Summary of the development of large capacity power electronics technology and application in China[J].Journal of Electrical Engineering,2015,10(4):26-34.
[9]Weimin Wu,Yuanbin He,Tianhao Tang.A new design method for the passive damped LCL and LLCLfilter-based single-phase grid-tied inverter[J].IEEETransactions on Industrial Electronics,2013,60(10):4339-4350.
[10]Weimin Wu,Zhe Lin,Yunjie Sun,et al.A hybrid damping method for LLCL-filter based grid-tied inverter with a digital filter and an RCparallel passive damper[J].2013 IEEE Energy Conversion Congress and Exposition,2013:456-463.
[11]邱晓明,王明渝,胡文翠.LLCL滤波的单相光伏并网逆变器控制技术研究[J].电力系统保护与控制,2013,41(10):74-79.QIU Xiaoming,WANG Mingyu,HU Wencui.Research on control technology of LLCL filtered single-phase photovoltaic grid-connected inverter[J].Power System Protection and Control,2013,41(10):74-79.
[12]魏星,肖岚,姚志垒,等.三相并网逆变器的LCL滤波器设计[J].电力电子技术,2010,44(11):13-15.WEI Xing,XIAO Lan,YAO Zhilei,et al.Design of LCL filter for three-phase grid-connected inverters[J].Power Electronics,2010,44(11):13-15.
[13]Liu F,Zha X,Duan S.Three-phase inverter with LCL filter design parameters and research[J].Electric Power Systems,2010(3):110-115.