基于双PI+重复控制的光伏逆变器谐波抑制策略
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摘要
针对光伏逆变器并网电流谐波较大的问题,首先对三电平逆变器的主电路结构进行了分析,得出了网侧输出电流的数学模型,并分析了该模型下逆变器谐波产生的机理。在分析了传统的PI+重复控制的基础上,针对传统PI与重复控制相互耦合容易导致等效重复控制对象不稳定的问题,提出了一种双PI+重复控制(double proportional integral+repetitive control,DPI+RC)的控制策略。采用PI补偿,在保证了传统PI+重复控制系统跟踪的快速性和准确性前提下,确保了系统的稳定性。最后,通过仿真和试验分析,验证了该控制策略对谐波抑制的有效性和可行性。
In this paper, the main circuit structure of the photovoltaic inverter is analyzed, the mathematical model of the net output current is generated, and the mechanism of harmonic generation of inverter under this model is analyzed.Based on the analysis of traditional PI+ repetitive control, for the problem of the equivalent repetitive control object instability easily caused by the coupling of traditional PI and repetitive control, this paper presents a control strategy of Double Proportional Integral + Repetitive Control(DPI+RC).By using PI compensation, the stability of the system is ensured by ensuring the speed and accuracy of traditional PI+ repetitive control system tracking. Finally, the feasibility of the control strategy for harmonic suppression is verified through simulation and experimental analysis.
In this paper, the main circuit structure of the photovoltaic inverter is analyzed, the mathematical model of the net output current is generated, and the mechanism of harmonic generation of inverter under this model is analyzed.Based on the analysis of traditional PI+ repetitive control, for the problem of the equivalent repetitive control object instability easily caused by the coupling of traditional PI and repetitive control, this paper presents a control strategy of Double Proportional Integral + Repetitive Control(DPI+RC).By using PI compensation, the stability of the system is ensured by ensuring the speed and accuracy of traditional PI+ repetitive control system tracking. Finally, the feasibility of the control strategy for harmonic suppression is verified through simulation and experimental analysis.
引文
[1]郭虎成.三电平逆变器控制技术研究现状[J].机械制造与自动化,2013,41(1):179-180,183.Guo Hucheng.Development of Control Technology for ThreeLevel Inverter[J].Machine Building&Automation,2013,41(1):179-180,183(in Chinese).
[2]王兆安,杨君,刘进军.谐波抑制和无功功率补偿[M].北京:机械工业出版社,2016,1.
[3]费万民,吕征宇,姚文熙.三电平逆变器特定谐波消除脉宽调制方法的研究[J].中国电机工程学报,2003,23(9):11-15.Fei Wanmin,Lyu Zhengyu,Yao Wenxi.Research on Selected Harmonic Elimination PWM Technique Applicable to ThreeLevel Voltage Inverters[J].Proceedings of the CSEE,2003,23(9):11-15(in Chinese).
[4]张云,孙力,孙醒涛,等.三相H桥三电平逆变器谐波抑制方法[J].电力自动化设备,2009,29(9):21-25.Zhang Yun,Sun Li,Sun Xingtao,et al.Harmonic Suppression of Three-Phase Three-Level Inverter with H Bridges[J].Electric Power Automation Equipment,2009,29(9):21-25(in Chinese).
[5]孟建辉,石新春,付超,等.基于PR控制的光伏并网电流优化控制[J].电力自动化设备,2014,34(2):42-47.Meng Jianhui,Shi Xinchun,Fu Chao,et al.Optimal Control of Photovoltaic Grid-Connected Current Based on PR Control[J].Electric Power Automation Equipment,2014,34(2):42-47(in Chinese).
[6]梁燕,李生林,周长新,等.组串式逆变器谐波抑制策略[J].自动化技术与应用,2017,36(3):67-70.Liang Yan,Li Shenglin,Zhou Changxin,et al.Harmonic Elimination Strategy of String Inverter Systen[J].Techniques of Automation and Application,2017,36(3):67-70(in Chinese).
[7]陈东,张军明,钱照明,等.一种具有频率变化适应性的并网逆变器改进型重复控制方法[J].电工技术学报,2014,29(6):64-70.Chen Dong,Zhang Junming,Qian Zhaoming,et al.An Improved Repetitive Control Scheme for Grid-Connected Inverter with Frequency-Varying Adaptability[J].Transactions of China Electronic Technical Society,2014,29(6):64-70(in Chinese).
[8]Zhou Keliang,Low K,Wang D,et al.Zero-phase Odd Harmonic Repetitive Controller for a Single-phase PWMInverter[J].IEEE Transactions on Power Electronics,2006,21(1):193-201.
[9]Yang Shuitao,Cui Bin,Zhang Fan,et al.A Robust Repetitive Control Method for CVCF Inverters with Very Low Harmonic Distortion[C]//Applied Power Electronics Conference,Anaheim,CA,USA,2007.
[10]王禹玺,刘秦维,刘伟,等.一种加权式并联型重复控制的研究[J].电工技术学报,2015,30(8):127-134.Wang Yuxi,Liu Qinwei,Liu Wei,et al.Study of Weighted Parallel-Type Repetitive Control[J].Transactions of China Electronic Technical Society,2015,30(8):127-134(in Chinese).
[11]王斯然,吕征宇.LCL型并网逆变器中重复控制方法研究[J].中国电机工程学报,2010,30(27):69-75.Wang Siran,Lyu Zhengyu.Research on Repetitive Control Method Applied to Grid-Connected Inverter with LCLFilter[J].Proceedings of the CSEE,2010,30(27):69-75(in Chinese).
[12]张崇巍,张兴.PWM整流器及其控制[M].北京:机械工业出版社,2003,10.
[2]王兆安,杨君,刘进军.谐波抑制和无功功率补偿[M].北京:机械工业出版社,2016,1.
[3]费万民,吕征宇,姚文熙.三电平逆变器特定谐波消除脉宽调制方法的研究[J].中国电机工程学报,2003,23(9):11-15.Fei Wanmin,Lyu Zhengyu,Yao Wenxi.Research on Selected Harmonic Elimination PWM Technique Applicable to ThreeLevel Voltage Inverters[J].Proceedings of the CSEE,2003,23(9):11-15(in Chinese).
[4]张云,孙力,孙醒涛,等.三相H桥三电平逆变器谐波抑制方法[J].电力自动化设备,2009,29(9):21-25.Zhang Yun,Sun Li,Sun Xingtao,et al.Harmonic Suppression of Three-Phase Three-Level Inverter with H Bridges[J].Electric Power Automation Equipment,2009,29(9):21-25(in Chinese).
[5]孟建辉,石新春,付超,等.基于PR控制的光伏并网电流优化控制[J].电力自动化设备,2014,34(2):42-47.Meng Jianhui,Shi Xinchun,Fu Chao,et al.Optimal Control of Photovoltaic Grid-Connected Current Based on PR Control[J].Electric Power Automation Equipment,2014,34(2):42-47(in Chinese).
[6]梁燕,李生林,周长新,等.组串式逆变器谐波抑制策略[J].自动化技术与应用,2017,36(3):67-70.Liang Yan,Li Shenglin,Zhou Changxin,et al.Harmonic Elimination Strategy of String Inverter Systen[J].Techniques of Automation and Application,2017,36(3):67-70(in Chinese).
[7]陈东,张军明,钱照明,等.一种具有频率变化适应性的并网逆变器改进型重复控制方法[J].电工技术学报,2014,29(6):64-70.Chen Dong,Zhang Junming,Qian Zhaoming,et al.An Improved Repetitive Control Scheme for Grid-Connected Inverter with Frequency-Varying Adaptability[J].Transactions of China Electronic Technical Society,2014,29(6):64-70(in Chinese).
[8]Zhou Keliang,Low K,Wang D,et al.Zero-phase Odd Harmonic Repetitive Controller for a Single-phase PWMInverter[J].IEEE Transactions on Power Electronics,2006,21(1):193-201.
[9]Yang Shuitao,Cui Bin,Zhang Fan,et al.A Robust Repetitive Control Method for CVCF Inverters with Very Low Harmonic Distortion[C]//Applied Power Electronics Conference,Anaheim,CA,USA,2007.
[10]王禹玺,刘秦维,刘伟,等.一种加权式并联型重复控制的研究[J].电工技术学报,2015,30(8):127-134.Wang Yuxi,Liu Qinwei,Liu Wei,et al.Study of Weighted Parallel-Type Repetitive Control[J].Transactions of China Electronic Technical Society,2015,30(8):127-134(in Chinese).
[11]王斯然,吕征宇.LCL型并网逆变器中重复控制方法研究[J].中国电机工程学报,2010,30(27):69-75.Wang Siran,Lyu Zhengyu.Research on Repetitive Control Method Applied to Grid-Connected Inverter with LCLFilter[J].Proceedings of the CSEE,2010,30(27):69-75(in Chinese).
[12]张崇巍,张兴.PWM整流器及其控制[M].北京:机械工业出版社,2003,10.