单相二极管箝位三电平电压源型换流器谐波分析
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摘要
电压源型换流器(voltage source converters,VSC)正常工作时会产生谐波,对电网造成污染。因此,有必要建立其谐波分析模型,分析谐波产生机理和相互作用规律。本文首先分析了单相二极管箝位三电平电压源型换流器时域下的数学模型且建立不同调制方式下开关函数的动态相量模型,并将单相三电平时域模型转化为动态相量谐波分析模型;然后基于龙格库塔法解得不同调制方式下,交流侧电流和直流侧电压各次谐波含量;接着,通过仿真分析,验证了所提出谐波分析模型的正确性;最后,通过分析单相三电平电压源型换流器的动态相量模型,揭示了交流侧电流和直流侧电压谐波产生的机理和相互影响规律。
Voltage source converters(VSC)in operation generate harmonic,leading to pollution to the power grid.Thus,it is necessary to set up its harmonic analysis model in order to analyze its harmonic generation mechanism and interaction rule.In this paper,the mathematical model of single-phase-three-level neutral point clamped voltage source converter under time-domain is analyzed firstly,the dynamic phasor model of switching function at different modulations is set up and the time-domain model is transferred into the dynamic phasor harmonic analysis model.Then,contents of harmonic for current at AC side and voltage at DC side are obtained at different modulation on the basis of Runge-kutta method.After that,the correctness of the proposed harmonic analysis model is verified by simulation analysis and generation mechanism and interaction rule for the current at AC side and voltage at DC side is revealed through the analysis of the dynamic phasor model of the single-phase-three-level neutral point clamped voltage source converter.
Voltage source converters(VSC)in operation generate harmonic,leading to pollution to the power grid.Thus,it is necessary to set up its harmonic analysis model in order to analyze its harmonic generation mechanism and interaction rule.In this paper,the mathematical model of single-phase-three-level neutral point clamped voltage source converter under time-domain is analyzed firstly,the dynamic phasor model of switching function at different modulations is set up and the time-domain model is transferred into the dynamic phasor harmonic analysis model.Then,contents of harmonic for current at AC side and voltage at DC side are obtained at different modulation on the basis of Runge-kutta method.After that,the correctness of the proposed harmonic analysis model is verified by simulation analysis and generation mechanism and interaction rule for the current at AC side and voltage at DC side is revealed through the analysis of the dynamic phasor model of the single-phase-three-level neutral point clamped voltage source converter.
引文
[1]ZHOU Keliang,QIU Zhipeng,WATSON N R,et al.Mechanism and elimination of harmonic current injection from single-phase grid-connected PWM converters[J].IET Power Electronics,2013,6(1):88-95.
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[8]钟庆,黄凯,王钢,等.不对称三相电压下电压源型换流器谐波分析与抑制策略[J].电力系统自动化,2014,38(4):79-85.ZHONG Qing,HUANG Kai,WANG Gang,et al.Harmonic analysis and elimination strategy for voltage source converter under unbalanced three-phase voltage[J].Automation of Electric Power Systems,2014,38(4):79-85.
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[10]钟庆,汪逍旻,王钢,等.电压源型换流器谐波产生机理的道路树分析[J].高电压技术,2016,42(1):26-32.ZHONG Qing,WANG Xiaomin,WANG Gang,et al.Analysis of the harmonic generation mechanisms of voltage source converters with path sets[J].High Voltage Engineering,2016,42(1):26-32.
[11]肖晃庆,徐政,薛英林,等.模块化多电平换流器谐波特性解析分析[J].中国科学:技术科学,2013,43(11):1272-1280.
[12]宋文胜,崔凯,陈春阳,等.单相三电平脉冲整流器网侧谐波特性研究[J].电机与控制学报,2013,17(12):39-45.SONG Wensheng,CUI Kai,CHEN Chunyang,et al.Harmonic characteristic analysis of single-phase three level PWM rectifiers[J].Electric Machines and Control,2013,17(12):39-45.
[13]霍姆斯.电力电子变换器PWM技术原理与实践[M].北京:人民邮电出版社,2010.
[14]李宁,王跃,王兆安,等.4种三电平载波调制策略对比研究[J].电气传动,2015,45(12):35-40.LI Ning,WANG Yue,WANG Zhaoan,et al.Comparative study of four kinds of three-level carrier-based PWM strategies[J].Electric Drive,2015,45(12):35-40.
[15]薛定宇,陈阳泉.基于MATLAB/Simulink的系统仿真技术与应用[M].北京:清华大学出版社,2002.
[2]同向前,伍文俊,任碧莹.电压源换流器在电力系统中的应用[M].北京:机械工业出版社,2012.
[3]王兆安,刘进军[M].第5版.北京:机械工业出版社,2009.
[4]姚伟,程时杰,文劲宇.电压源型直流输电的动态相量建模与仿真[J].高电压技术,2008,34(6):1115-1120.YAO Wei,CHENG Shijie,WEN Jinyu.Modeling and simulation of VSC-HVDC with dynamic phasors[J].High Voltage Engineering,2008,34(6):1115-1120.
[5]SEGUNDO RAMIREZ J,PENA GALLARDO R,MEDINA A A,et al.A comprehensive modeling of a three-phase voltage source PWM converter[J].Mathematical Problems in Engineering,2015.
[6]HUERTA F,COBRECES S,RODRIGUEZ F J.et al.Statespace black-box model identification of a voltage-source converter with LCL filter[C]//2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems.[S.L.]:IEEE,2012:550-557.
[7]LEHN P W.Exact modeling of the voltage source converter[J].IEEE Power Engineering Review,2007,21(11):61-61.
[8]钟庆,黄凯,王钢,等.不对称三相电压下电压源型换流器谐波分析与抑制策略[J].电力系统自动化,2014,38(4):79-85.ZHONG Qing,HUANG Kai,WANG Gang,et al.Harmonic analysis and elimination strategy for voltage source converter under unbalanced three-phase voltage[J].Automation of Electric Power Systems,2014,38(4):79-85.
[9]曾胜玮.基于动态相量法的电压源型换流器谐波分析[D].广州:华南理工大学,2013.
[10]钟庆,汪逍旻,王钢,等.电压源型换流器谐波产生机理的道路树分析[J].高电压技术,2016,42(1):26-32.ZHONG Qing,WANG Xiaomin,WANG Gang,et al.Analysis of the harmonic generation mechanisms of voltage source converters with path sets[J].High Voltage Engineering,2016,42(1):26-32.
[11]肖晃庆,徐政,薛英林,等.模块化多电平换流器谐波特性解析分析[J].中国科学:技术科学,2013,43(11):1272-1280.
[12]宋文胜,崔凯,陈春阳,等.单相三电平脉冲整流器网侧谐波特性研究[J].电机与控制学报,2013,17(12):39-45.SONG Wensheng,CUI Kai,CHEN Chunyang,et al.Harmonic characteristic analysis of single-phase three level PWM rectifiers[J].Electric Machines and Control,2013,17(12):39-45.
[13]霍姆斯.电力电子变换器PWM技术原理与实践[M].北京:人民邮电出版社,2010.
[14]李宁,王跃,王兆安,等.4种三电平载波调制策略对比研究[J].电气传动,2015,45(12):35-40.LI Ning,WANG Yue,WANG Zhaoan,et al.Comparative study of four kinds of three-level carrier-based PWM strategies[J].Electric Drive,2015,45(12):35-40.
[15]薛定宇,陈阳泉.基于MATLAB/Simulink的系统仿真技术与应用[M].北京:清华大学出版社,2002.