电网电压谐波对并网逆变器输出电流质量的影响及改进控制策略研究
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摘要
本文基于可再生能源并网发电系统公共耦合点电压存在背景谐波,建立了并网逆变器的等效电路模型,解析了公共耦合点处电压背景谐波影响并网逆变器输出电流的机理,在控制环路中引入多谐振控制器改善了并网逆变器的输出电能质量,并给出了一种多谐振控制器参数设计的方法。最后,在仿真软件中搭建了可再生能源发电系统和配电网的模型,设定了电网背景谐波参数,分别进行了有无多谐振控制器控制策略的仿真实验,实验结果验证了本文采用的控制策略的正确性和可行性。
In this paper,the equivalent circuit model of grid-connected inverter is established with considering the background harmonics of common coupling point voltage in renewable generation system. The mechanism of the influence of voltage background harmonics at common coupling point on the output current of grid-connected inverter is analyzed. A multi-resonant controller is introduced into the control loop to improve the output power quality of grid-connected inverter. Parameter design method of multi-resonant controller is given.Finally,the model of renewable energy generation system and distribution network is built in the simulation software,and the background harmonic parameters are set. The simulation experiments of the control strategy with or without multi-resonant controller are carried out respectively. The correctness and feasibility of the control strategy used in this paper is verified by the experimental result.
In this paper,the equivalent circuit model of grid-connected inverter is established with considering the background harmonics of common coupling point voltage in renewable generation system. The mechanism of the influence of voltage background harmonics at common coupling point on the output current of grid-connected inverter is analyzed. A multi-resonant controller is introduced into the control loop to improve the output power quality of grid-connected inverter. Parameter design method of multi-resonant controller is given.Finally,the model of renewable energy generation system and distribution network is built in the simulation software,and the background harmonic parameters are set. The simulation experiments of the control strategy with or without multi-resonant controller are carried out respectively. The correctness and feasibility of the control strategy used in this paper is verified by the experimental result.
引文
[1]代晓东,王余宝,毕晓光,等.2016年世界能源供需情况分析与未来展望--基于《BP世界能源统计年鉴》与《BP世界能源展望》[J].天然气与石油,2017,35(6):8-12.DAI Xiaodong,WANG Yubao,BI Xiaoguang,et al.Analysis on world energy supply&demand in 2016 and future prospects-based on BP statistical review on world energy and BP world energy prospect[J].Natural Gas and Oil,2017,35(6):8-12.
[2]滕宇,王学华,余辉,等.提高LCL型并网逆变器对电网阻抗鲁棒性的阻抗调节方法[J].中国电机工程学报,2015,35(S1):197-204.TENG Yu,WANG Xuehua,YU Hui,et al.A grid impedance shaping method to improve robustness of LCL type gridconnected inverter against grid impedance variation[J].Proceedings of the CSEE,2015,35(S1):197-204.
[3]LISERRE M,TEODORESCU R,BLAABJERG F.Stability of photovoltaic and wind turbine gridconnected inverters for a large set of grid impedance values[J].IEEE Transactions on Power Electronics,2006,21(1):263-272.
[4]李小强.LCL滤波的并网逆变器非理想电网适应性分析及优化控制[D].徐州:中国矿业大学,2015.
[5]尹球洋,王学华,徐林.一种实用前馈在逆变器带非线性负载中的应用[J].电力电子技术,2018,52(7):1-6.
[6]潘嘉进,刘彦呈,张勤进,等.基于电网电压全前馈的七电平光伏并网系统[J].电力系统及其自动化学报,2017,29(6):53-58.PAN Jiajin,LIU Yancheng,ZHANG Qinjin,et al.Sevenlevel PV system based on full feedforward of grid voltage[J].Proceedings of the CSUEPSA,2017,29(6):53-58.
[7]李巍巍.三相LCL型并网逆变器中电网电压引起的谐波和不平衡电流抑制研究[D].武汉:华中科技大学,2014.
[8]许胜,费树岷,赵剑锋,等.基于同步旋转坐标系的有源电力滤波器控制延时动态预测补偿策略[J].电工技术学报,2016,31(12):161-169.XU Sheng,FEI Shumin,ZHAO Jianfeng,et al.The dynamic predictive compensation strategy for the time delay of active power filter control system based on synchronous rotating frame[J].Transactions of China Electrotechnical Society,2016,31(12):161-169.
[9]汪兴.谐波电网下双馈风力发电系统的协调控制[D].合肥:合肥工业大学,2016.
[10]杨林,曾江,杨清波.三电平逆变器简化SVPWM策略及其误差电流分析[J].广东电力,2017,30(12):48-54.YANG Lin,ZENG Jiang,YANG Qingbo.Analysis on Simplified SVPWM Strategy for Three-level Inverter and Its Error Current[J].Guangdong Electric Power,2017,30(12):48-54.
[11]沈虹,李清坤,郭小强,等.解耦混合坐标系并网逆变器电网同步方法[J].电力系统自动化,2014,38(20):96-100.SHEN Hong,LI Qingkun,GUO Xiaoqiang,et al.Decoupling hybrid frame based grid synchronization method for gridconnected inverters[J].Automation of Electric Power Systems,2014,38(20):96-100.
[12]罗皓文,席自强,王艳姗.一种基于同步旋转坐标系的指定次谐波补偿控制[J].湖北工业大学学报,2013,28(1):51-55.LUO Haowen,XI Ziqiang,WANG Yanshan.A selective harmonic compensation control based on synchronous rotate frame[J].Journal of Hubei University of Technology,2013,28(1):51-55.
[13]ZMOOD D N,HOLMES D G.Stationary frame current regulation of PWM inverters with zero steadystate error[J].IEEETransactions on Power Electronics,2003,18(3):814-822.
[14]YUAN X M,MERK W,STEMMLER H,et al.Stationaryframe generalized integrators for current control of active power filters with zero steadystate error for current harmonics of concern under unbalanced and distorted operating conditions[J].IEEE Transactions on Industry Applications,2002,38(2):523-532.
[15]ZMOOD D N,HOLMES D G,BODE G H.Frequency domain analysis of threephase linear current regulators[J].IEEE Transactions on Industry Applications,2001,37(2):601-610.
[16]MUSOLINO V,PIEGARI L,TIRONI E.New fullfrequencyrange supercapacitor model with easy identification procedure[J].IEEE Transactions on Industrial Electronics,2013,60(1):112-120.
[2]滕宇,王学华,余辉,等.提高LCL型并网逆变器对电网阻抗鲁棒性的阻抗调节方法[J].中国电机工程学报,2015,35(S1):197-204.TENG Yu,WANG Xuehua,YU Hui,et al.A grid impedance shaping method to improve robustness of LCL type gridconnected inverter against grid impedance variation[J].Proceedings of the CSEE,2015,35(S1):197-204.
[3]LISERRE M,TEODORESCU R,BLAABJERG F.Stability of photovoltaic and wind turbine gridconnected inverters for a large set of grid impedance values[J].IEEE Transactions on Power Electronics,2006,21(1):263-272.
[4]李小强.LCL滤波的并网逆变器非理想电网适应性分析及优化控制[D].徐州:中国矿业大学,2015.
[5]尹球洋,王学华,徐林.一种实用前馈在逆变器带非线性负载中的应用[J].电力电子技术,2018,52(7):1-6.
[6]潘嘉进,刘彦呈,张勤进,等.基于电网电压全前馈的七电平光伏并网系统[J].电力系统及其自动化学报,2017,29(6):53-58.PAN Jiajin,LIU Yancheng,ZHANG Qinjin,et al.Sevenlevel PV system based on full feedforward of grid voltage[J].Proceedings of the CSUEPSA,2017,29(6):53-58.
[7]李巍巍.三相LCL型并网逆变器中电网电压引起的谐波和不平衡电流抑制研究[D].武汉:华中科技大学,2014.
[8]许胜,费树岷,赵剑锋,等.基于同步旋转坐标系的有源电力滤波器控制延时动态预测补偿策略[J].电工技术学报,2016,31(12):161-169.XU Sheng,FEI Shumin,ZHAO Jianfeng,et al.The dynamic predictive compensation strategy for the time delay of active power filter control system based on synchronous rotating frame[J].Transactions of China Electrotechnical Society,2016,31(12):161-169.
[9]汪兴.谐波电网下双馈风力发电系统的协调控制[D].合肥:合肥工业大学,2016.
[10]杨林,曾江,杨清波.三电平逆变器简化SVPWM策略及其误差电流分析[J].广东电力,2017,30(12):48-54.YANG Lin,ZENG Jiang,YANG Qingbo.Analysis on Simplified SVPWM Strategy for Three-level Inverter and Its Error Current[J].Guangdong Electric Power,2017,30(12):48-54.
[11]沈虹,李清坤,郭小强,等.解耦混合坐标系并网逆变器电网同步方法[J].电力系统自动化,2014,38(20):96-100.SHEN Hong,LI Qingkun,GUO Xiaoqiang,et al.Decoupling hybrid frame based grid synchronization method for gridconnected inverters[J].Automation of Electric Power Systems,2014,38(20):96-100.
[12]罗皓文,席自强,王艳姗.一种基于同步旋转坐标系的指定次谐波补偿控制[J].湖北工业大学学报,2013,28(1):51-55.LUO Haowen,XI Ziqiang,WANG Yanshan.A selective harmonic compensation control based on synchronous rotate frame[J].Journal of Hubei University of Technology,2013,28(1):51-55.
[13]ZMOOD D N,HOLMES D G.Stationary frame current regulation of PWM inverters with zero steadystate error[J].IEEETransactions on Power Electronics,2003,18(3):814-822.
[14]YUAN X M,MERK W,STEMMLER H,et al.Stationaryframe generalized integrators for current control of active power filters with zero steadystate error for current harmonics of concern under unbalanced and distorted operating conditions[J].IEEE Transactions on Industry Applications,2002,38(2):523-532.
[15]ZMOOD D N,HOLMES D G,BODE G H.Frequency domain analysis of threephase linear current regulators[J].IEEE Transactions on Industry Applications,2001,37(2):601-610.
[16]MUSOLINO V,PIEGARI L,TIRONI E.New fullfrequencyrange supercapacitor model with easy identification procedure[J].IEEE Transactions on Industrial Electronics,2013,60(1):112-120.