模块化多电平逆变器预充电控制策略
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摘要
针对矿井提升机运行特点,采用由模块化多电平整流器和模块化多电平逆变器构成的背靠背模块化多电平变流器用于矿井提升机控制;针对目前通过直流侧对模块化多电平逆变器进行预充电的控制研究较少的问题,提出了一种模块化多电平逆变器预充电控制策略。该控制策略通过控制充电电流来控制子模块充电状态,使子模块电容充电至模块化多电平变流器稳定运行时的电压要求,同时将充电电流和充电过程中产生的过电压限定在安全范围内,使充电时间最短。仿真结果验证了该控制策略的有效性。
According to operation characteristics of mine hoist,a back-to-back modular multilevel converter composed of modular multilevel rectifier and modular multilevel inverter was used for control of mine hoist.In view of current research on pre-charging control for modular multi-level inverter through DC side was less,apre-charging control strategy of modular multilevel inverter was proposed.Charging state of sub-module is controlled by controlling charging current,so that capacitor of the sub-module can be charged to meet voltage requirement of the modular multilevel converter in stable operation.Meanwhile,charging current and overvoltage generated in charging process are limited to safe range and charging time is the shortest.The simulation results verify effectiveness of the control strategy.
According to operation characteristics of mine hoist,a back-to-back modular multilevel converter composed of modular multilevel rectifier and modular multilevel inverter was used for control of mine hoist.In view of current research on pre-charging control for modular multi-level inverter through DC side was less,apre-charging control strategy of modular multilevel inverter was proposed.Charging state of sub-module is controlled by controlling charging current,so that capacitor of the sub-module can be charged to meet voltage requirement of the modular multilevel converter in stable operation.Meanwhile,charging current and overvoltage generated in charging process are limited to safe range and charging time is the shortest.The simulation results verify effectiveness of the control strategy.
引文
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[2]李荣生,宋平.基于变频器控制的矿井提升机系统[J].工矿自动化,2008,34(6):128-131.LI Rongsheng,SONG Ping.Mine hoist system based on frequency converter control[J].Industry and Mine Automation,2008,34(6):128-131.
[3]刘钟淇,宋强,刘文华.新型模块化多电平变流器的控制策略研究[J].电力电子技术,2009,43(10):5-7.LIU Zhongqi,SONG Qiang,LIU Wenhua.Research on control of the novel modular multilevel converters[J].Power Electronics,2009,43(10):5-7.
[4]管敏渊,徐政,屠卿瑞,等.模块化多电平换流器型直流输电的调制策略[J].电力系统自动化,2010,34(2):48-51.GUAN Minyuan,XU Zheng,TU Qingrui,et al.Nearest level modulation for modular multilevel converters in HVDC transmission[J].Automation of Electric Power Systems,2010,34(2):48-51.
[5]王晓鹏,杨晓峰,范文宝,等.模块组合多电平变换器的脉冲调制方案对比[J].电工技术学报,2011,26(5):28-33.WANG Xiaopeng,YANG Xiaofeng,FAN Wenbao,et al.A comparative study of multi-pulse modulation schemes for modular multilevel converters[J].Transactions of China Electrotechnical Society,2011,26(5):28-33.
[6]宁凌云.应用于电厂鼓风机变频运行的MMC控制技术研究[J].电气传动自动化,2016,38(1):16-20.NING Lingyun.Research on MMC control technology applied to power plant blower frequency conversion operation[J].Electrical Drive Automation,2016,38(1):16-20.
[7]石珩.适用于矿井提升机控制的模块化多电平变流器研究[D].兰州:兰州理工大学,2017.
[8]王兴贵,石珩,魏永武.多电平变流器在大功率矿井提升机中的应用[J].矿山机械,2017,45(7):1-6.WANGXinggui, SHIHeng, WEIYongwu.Application of multi-level converter in high-power mine hoist[J].Mining&Processing Equipment,2017,45(7):1-6.
[9]姜燕,黄禹,胡敬伟,等.模块化多电平换流器预充电的控制策略[J].控制工程,2015,22(6):1069-1075.JIANG Yan,HUANG Yu,HU Jingwei,et al.Precharging control strategies of modular multilevel converter[J].Control Engineering of China,2015,22(6):1069-1075.
[10]孔明,邱宇峰,贺之渊,等.模块化多电平式柔性直流输电换流器的预充电控制策略[J].电网技术,2011,35(11):67-73.KONG Ming,QIU Yufeng,HE Zhiyuan,et al.Precharging control strategies of modular multilevel converter for VSC-HVDC[J].Power System Technology,2011,35(11):67-73.
[11]冯明,李兴源,李宽,等.多端柔性直流输电系统启动控制及其仿真[J].电力系统保护与控制,2013,41(14):60-65.FENG Ming,LI Xingyuan,LI Kuan,et al.Control and simulation of VSC-MTDC start-up procedure[J].Power System Protection and Control,2013,41(14):60-65.
[12]郭全军.模块化多电平变换器控制策略研究[D].徐州:中国矿业大学,2014.
[13] LESNICAR A,MARQUARDT R.An innovative modular multilevel converter topology suitable for a wide power range[C]//Proceedings of IEEE Power Tech Conference,Bologna,2003:1-6.
[14]丁冠军,汤广福,丁明,等.新型多电平电压源换流器模块的拓扑机制与调制策略[J].中国电机工程学报,2009,29(36):1-8.DING Guanjun,TANG Guangfu,DING Ming,et al.Topology mechanism and modulation scheme of a new multilevel voltage source converter modular[J].Proceedings of the CSEE,2009,29(36):1-8.
[15]管敏渊,徐政.模块化多电平换流器型直流输电的建模与控制[J].电力系统自动化,2010,34(19):64-68.GUAN Minyuan,XU Zheng.Modeling and control of modular multilevel converter in HVDC transmission[J].Automation of Electric Power Systems,2010,34(19):64-68.