级联H桥型SVG的控制策略研究
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摘要
针对静止无功发生器(static var generator,SVG)在无功补偿时存在直流侧电压不平衡和系统不稳定性等问题,在级联型H桥逆变器的基础上,建立了星型链式SVG的数学模型,构建了双闭环控制系统,其中电流内环采用PI解耦控制,电压外环采用分层控制,解决了直流侧电容电压的平衡问题,实现了系统的稳定工作。最后,在MATLAB/Simulink中构建了系统的仿真模型。仿真结果表明,所提出的控制方法具有较好的补偿效果和快速的动态性能。
In order to solve unbalanced DC voltage and system instability of the static var generator(SVG) during reactive compensation, a chained star type SVG mathematical model was established based on the cascaded H-bridge inverter, and a double closed-loop control system was constructed with the inner current loop controlled by PI decoupling and the outer voltage loop adopting stratification control, thus achieving balance between capacitance and voltage at the DC side and realizing stable system operation. Finally, a simulation model of the system was constructed in MATLAB/Simulink. The simulation results showed that the proposed control method had quite good compensation effect and fast dynamic performance.
In order to solve unbalanced DC voltage and system instability of the static var generator(SVG) during reactive compensation, a chained star type SVG mathematical model was established based on the cascaded H-bridge inverter, and a double closed-loop control system was constructed with the inner current loop controlled by PI decoupling and the outer voltage loop adopting stratification control, thus achieving balance between capacitance and voltage at the DC side and realizing stable system operation. Finally, a simulation model of the system was constructed in MATLAB/Simulink. The simulation results showed that the proposed control method had quite good compensation effect and fast dynamic performance.
引文
[1]李赟贵,杭丽君,李国杰.基于MMC的整流系统在不对称桥臂下的环流抑制方法[J].电气自动化,2017,39(2):3-4.
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[4]陈丽兵.基于级联H桥的STATCOM及其控制策略的研究[D].徐州:中国矿业大学,2014.
[5]SOBINK K H,RENZ K W,TYLL H K.Operation experience and field tests of the ASVG at rejsby hede[J].IEEE POWERCON,1998,25(4):318-322.
[6]刘洋.电流解耦控制的静止无功发生器的研究[D].哈尔滨:哈尔滨理工大学,2013..
[7]PENG F Z,WANG J.A universal STATCOM with delta-connected cascade multilevel inverter[C]//IEEE Power Electronics Specialists Conference,2004(35):3529-3533.
[8]田铭兴,阎宏,赵雨欣.级联H桥直流电压平衡控制方法[J].电网技术,2013,37(9):2632-2638.
[9]彭智育.基于H桥级联的链式STATCOM仿真研究[J].软件,2014,35(7):129-133.
[10]宫力.级联H桥多电平STATCOM关键技术研究[D].武汉:华中科技大学,2012.
[2]EDWARDS C W.Advanced static var generator employing GTO thyristor[J].IEEE.Trans on Power Delivery,2008,3(4):78-85.
[3]杜明军.大容量链式STATCOM主电路及控制策略的研究[D].北京:北京交通大学,2012.
[4]陈丽兵.基于级联H桥的STATCOM及其控制策略的研究[D].徐州:中国矿业大学,2014.
[5]SOBINK K H,RENZ K W,TYLL H K.Operation experience and field tests of the ASVG at rejsby hede[J].IEEE POWERCON,1998,25(4):318-322.
[6]刘洋.电流解耦控制的静止无功发生器的研究[D].哈尔滨:哈尔滨理工大学,2013..
[7]PENG F Z,WANG J.A universal STATCOM with delta-connected cascade multilevel inverter[C]//IEEE Power Electronics Specialists Conference,2004(35):3529-3533.
[8]田铭兴,阎宏,赵雨欣.级联H桥直流电压平衡控制方法[J].电网技术,2013,37(9):2632-2638.
[9]彭智育.基于H桥级联的链式STATCOM仿真研究[J].软件,2014,35(7):129-133.
[10]宫力.级联H桥多电平STATCOM关键技术研究[D].武汉:华中科技大学,2012.