模块化多电平柔性直流输电系统网侧故障控制策略及验证
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摘要
介绍了基于模块化多电平换流器(MMC)的柔性直流输电系统在网侧出现不平衡运行状态下的故障控制策略,对比了各种控制方式的优劣。在分析和推导MMC数学模型的基础上,提出了一种基于故障负序电压叠加的故障控制方法。利用离线仿真工具对该方法进行了仿真研究,并在实际工程中对该方法进行了实验验证,给出了仿真和工程试验结果。采用不同控制策略时的仿真结果比较以及仿真与工程实验结果对比表明,采用所提出的故障控制策略对提高柔性直流输电系统在发生网侧故障时的持续运行能力有所帮助。
Fault control strategies for the modular multilevel converter(MMC) based HVDC Flexible transmission system under unbalanced network conditions are described,and the advantages and shortages of various control designs are compared.A fault control method based on fault negative sequence voltage overlap is proposed according to the analysis and derivation of the MMC mathematical model.This method is simulated with off-line simulation tools and verified with tests in an actual project,and the results of the simulations and the engineering test are presented.The result comparison of simulations using different control strategies and the engineering test results show that the proposed control strategy is helpful for uninterrupted operation of the modular multilevel converter based HVDC Flexible system under system faults.
Fault control strategies for the modular multilevel converter(MMC) based HVDC Flexible transmission system under unbalanced network conditions are described,and the advantages and shortages of various control designs are compared.A fault control method based on fault negative sequence voltage overlap is proposed according to the analysis and derivation of the MMC mathematical model.This method is simulated with off-line simulation tools and verified with tests in an actual project,and the results of the simulations and the engineering test are presented.The result comparison of simulations using different control strategies and the engineering test results show that the proposed control strategy is helpful for uninterrupted operation of the modular multilevel converter based HVDC Flexible system under system faults.
引文
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[8]刘钟淇,宋强,刘文华.采用MMC变流器的VSC-HVDC系统故障态研究[J].电力电子技术,2010,44(9):69-71.LIU Zhongqi,SONG Qiang,LIU Wenhua.Research on theVSC-HVDC system using modular multilevel converters underfault condition[J].Power Electronics,2010,44(9):69-71.
[9]陈海荣,张静,屠卿瑞.电网电压不平衡时电压源换流器型直流输电的负序电压补偿控制[J].高电压技术,2011,37(10):2363-2369.CHEN Hairong,ZHANG Jing,TU Qingrui.Negative voltagecompensating control of voltage source converter based HVDCsystem under unbalanced grid conditions[J].High VoltageEngineering,2011,37(10):2363-2369.
[10]胡兆庆,毛承雄,陆继明.适用于电压源型高压直流输电的控制策略[J].电力系统自动化,2005,29(1):39-44.HU Zhaoqing,MAO Chenxiong,LU Jiming.A novel controlstrategy for voltage sourced converters based HVDC[J].Automation of Electric Power Systems,2005,29(1):39-44.
[11]赵成勇,李金丰,李广凯.基于有功和无功独立调节的VSC-HVDC控制策略[J].电力系统自动化,2005,29(9):20-24.ZHAO Chengyong,LI Jinfeng,LI Guangkai.VSC-HVDCcontrol strategy based on respective adjustment of active andreactive power[J].Automation of Electric Power Systems,2005,29(9):20-24.
[12]陈谦,唐国庆,胡铭.采用dq0坐标的VSC-HVDC稳态模型与控制器设计[J].电力系统自动化,2004,28(16):61-66.CHEN Qian,TANG Guoqing,HU Ming.Steady-state modeland controller design of a VSC-HVDC converter based on dq0-axis[J].Automation of Electric Power Systems,2004,28(16):61-66.
[13]董云龙,包海龙,田杰,等.柔性直流输电控制及保护系统[J].电力系统自动化,2011,35(19):89-92.DONG Yunlong,BAO Hailong,TIAN Jie,et al.Control andprotection system for VSC-HVDC[J].Automation of ElectricPower Systems,2011,35(19):89-92.
[2]李庚银,吕鹏飞,李广凯,等.轻型高压直流输电技术的发展与展望[J].电力系统自动化,2003,27(4):1-5.LI Gengyin,LPengfei,LI Guangkai,et al.Development andprospects for HVDC light[J].Automation of Electric PowerSystems,2003,27(4):1-5.
[3]管敏渊,徐政.MMC型VSC-HVDC系统电容电压的优化平衡控制[J].中国电机工程学报,2011,31(12):9-14.GUAN Minyuan,XU Zheng.Optimized capacitor voltagebalancing control for modular multilevel converter based VSC-HVDC system[J].Proceedings of the CSEE,2011,31(12):9-14.
[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):48-52.GUAN Minyuan,XU Zheng,TU Qingrui,et al.Nearest levelmodulation for modular multilevel converters in HVDCtransmission[J].Automation of Electric Power Systems,2010,34(2):48-52.
[5]XU L,ANDERSEN B R,CARTWRIGHT P.Multilevel-converter-based VSC transmission operating under fault ACconditions[J].IEE Proceedings:Generation,Transmission andDistribution,2005,152(2):185-193.
[6]周国梁,石新春,魏晓光,等.电压源换流器高压直流输电不平衡控制策略研究[J].中国电机工程学报,2008,28(22):137-143.ZHOU Guoliang,SHI Xinchun,WEI Xiaoguang,et al.Sliding-mode control based VSC-HVDC under unbalanced input voltagecondition[J].Proceedings of the CSEE,2008,28(22):137-143.
[7]皇甫成,贺之渊,汤广福,等.交流电网不平衡情况下电压源换相直流输电系统的控制策略[J].中国电机工程学报,2008,28(22):144-151.HUANGFU Cheng,HE Zhiyuan,TANG Guangfu,et al.Control strategy for the voltage source converter based HVDCtransmission system under unbalanced AC grid conditions[J].Proceedings of the CSEE,2008,28(22):144-151.
[8]刘钟淇,宋强,刘文华.采用MMC变流器的VSC-HVDC系统故障态研究[J].电力电子技术,2010,44(9):69-71.LIU Zhongqi,SONG Qiang,LIU Wenhua.Research on theVSC-HVDC system using modular multilevel converters underfault condition[J].Power Electronics,2010,44(9):69-71.
[9]陈海荣,张静,屠卿瑞.电网电压不平衡时电压源换流器型直流输电的负序电压补偿控制[J].高电压技术,2011,37(10):2363-2369.CHEN Hairong,ZHANG Jing,TU Qingrui.Negative voltagecompensating control of voltage source converter based HVDCsystem under unbalanced grid conditions[J].High VoltageEngineering,2011,37(10):2363-2369.
[10]胡兆庆,毛承雄,陆继明.适用于电压源型高压直流输电的控制策略[J].电力系统自动化,2005,29(1):39-44.HU Zhaoqing,MAO Chenxiong,LU Jiming.A novel controlstrategy for voltage sourced converters based HVDC[J].Automation of Electric Power Systems,2005,29(1):39-44.
[11]赵成勇,李金丰,李广凯.基于有功和无功独立调节的VSC-HVDC控制策略[J].电力系统自动化,2005,29(9):20-24.ZHAO Chengyong,LI Jinfeng,LI Guangkai.VSC-HVDCcontrol strategy based on respective adjustment of active andreactive power[J].Automation of Electric Power Systems,2005,29(9):20-24.
[12]陈谦,唐国庆,胡铭.采用dq0坐标的VSC-HVDC稳态模型与控制器设计[J].电力系统自动化,2004,28(16):61-66.CHEN Qian,TANG Guoqing,HU Ming.Steady-state modeland controller design of a VSC-HVDC converter based on dq0-axis[J].Automation of Electric Power Systems,2004,28(16):61-66.
[13]董云龙,包海龙,田杰,等.柔性直流输电控制及保护系统[J].电力系统自动化,2011,35(19):89-92.DONG Yunlong,BAO Hailong,TIAN Jie,et al.Control andprotection system for VSC-HVDC[J].Automation of ElectricPower Systems,2011,35(19):89-92.