考虑子模块均压约束的混合型模块化多电平换流器功率极限分析
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摘要
混合型模块化多电平换流器具备降压运行和不闭锁穿越直流故障的能力,子模块均压约束是其降压运行时对稳态功率运行范围起主要限制的运行约束。从满足子模块均压约束的换流器桥臂电流和桥臂电压的特性出发,分析了混合型模块化多电平换流器在降压运行时的功率极限运行范围。提出了快速确定混合型模块化多电平换流器可行功率运行域的计算方法。通过对比解析扫描计算的结果和电磁暂态仿真共同验证了计算方法的准确性和有效性。分析了全桥子模块比例对功率运行极限范围的影响。从功率运行能力的角度提出了全桥子模块最小比例的设计方法。
Hybrid Modular Multilevel Converter(MMC) has the ability to operate under reduced DC voltage and ride through DC faults without blocking IGBTs. Sub-module balancing constraint places the dominant limit on the feasible power transferring region compared to other constraints when it operates under reduced voltage. This paper analyzes the characteristics of the arm current and arm output voltage that meet sub-module balancing constraint, and calculates the corresponding maximum power operating region when hybrid modular multilevel converter operates under reduced voltage.A fast calculation method is proposed to determine the feasible operating region. The effectiveness and accuracy of the proposed method is validated by comparing calculation results with a scanning method and cross-verified by electromagnetic simulation. The impact of the full-bridge sub-module ration on the operating region is analyzed. A new design model regarding full-bridge sub-module minimum ratio is provided from the perspective of power transferring ability.
Hybrid Modular Multilevel Converter(MMC) has the ability to operate under reduced DC voltage and ride through DC faults without blocking IGBTs. Sub-module balancing constraint places the dominant limit on the feasible power transferring region compared to other constraints when it operates under reduced voltage. This paper analyzes the characteristics of the arm current and arm output voltage that meet sub-module balancing constraint, and calculates the corresponding maximum power operating region when hybrid modular multilevel converter operates under reduced voltage.A fast calculation method is proposed to determine the feasible operating region. The effectiveness and accuracy of the proposed method is validated by comparing calculation results with a scanning method and cross-verified by electromagnetic simulation. The impact of the full-bridge sub-module ration on the operating region is analyzed. A new design model regarding full-bridge sub-module minimum ratio is provided from the perspective of power transferring ability.
引文
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[12]ZENG Rong,XU Lie,YAO Liangzhong,et al.Design and operation of a hybrid modular multilevel converter[J].IEEE Transactions on Power Electronics,2015,30(3):1137-1146.
[13]LIN Weixing,DRAGAN J,SANMUEL N,et al.Full bridge MMC converter optimal design to HVDCoperational requirements[J].IEEE Transactions on Power Delivery,2016,31(3):1342-1350.
[14]CUI Shenghui,SUL S K.A comprehensive DCshort-circuit fault ride through strategy of hybrid modular multilevel converters(MMCs)for overhead line transmission[J].IEEE Transactions on Power Electronics,2016,31(11):7780-7796.
[15]HU Jiabing,XU Kecheng,LIN Lei,et al.Analysis and enhanced control of hybrid-MMC-based HVDC systems during asymmetrical DC voltage faults[J].IEEETransactions on Power Delivery,2017,32(3):1394-1403.
[16]李少华,王秀丽,李泰,等.混合式MMC及其直流故障穿越策略优化[J].中国电机工程学报,2016,36(7):1849-1858.LI Shaohua,WANG Xiuli,LI Tai,et al.Optimal design for hybrid MMC and its DC fault ride-through strategy[J].Proceedings of the CSEE,2016,36(7):1849-1858.
[17]XIANG Wang,LIN Weixing,XU Lie,et al.Enhanced independent pole control of hybrid MMC-HVDC system[J].IEEE Transactions on Power Delivery,2018,33(2):861-872.
[18]宋强,刘文华,李笑倩,等.模块化多电平换流器稳态运行特性的解析分析[J].电网技术,2012,36(11):198-204.SONG Qiang,LIU Wenhua,LI Xiaoqian,et al.An analytical method for analysis on steady-state operating characteristic of modular multilevel converter[J].Power System Technology,2012,36(11):198-204.
[19]刘普,王跃,雷万钧,等.模块化多电平变流器稳态运行特性分析[J].电工技术学报,2015,30(11):90-99.LIU Pu,WANG Yue,LEI Wanjun,et al.Analysis of steady-state operating characteristics for modular multilevel converters[J].Transactions of China Electrotechnical Society,2015,30(11):90-99.
[20]鲁晓军,林卫星,安婷,等.MMC电气系统动态相量模型统一建模方法及运行特性分析[J].中国电机工程学报,2016,36(20):5489-5501.LU Xiaojun,LIN Weixing,AN Ting,et al.A unified dynamic phasor modeling and operating characteristic analysis of electrical system of MMC[J].Proceedings of the CSEE,2016,36(20):5489-5501.
[21]鲁晓军,向往,林卫星,等.混合型模块化多电平换流器解析建模与功率运行区间分析[J].电力系统自动化.2018,42(7):76-84.LU Xiaojun,XIANG Wang,LIN Weixing,et al.Analysis on analytical modeling and power operating zone of hybrid modular multilevel converter[J].Automation of Electric Power Systems,2018,42(7):76-84.
[2]徐政,薛英林,张哲任.大容量架空线柔性直流输电关键技术及前景展望[J].中国电机工程学报,2014,34(29):5051-5062.XU Zheng,XUE Yinglin,ZHANG Zheren.VSC-HVDCtechnology suitable for bulk power overhead line transmission[J].Proceedings of the CSEE,2014,34(29):5051-5062.
[3]孙栩,曹士冬,卜广全,等.架空线柔性直流电网构建方案[J].电网技术,2016,40(3):678-682.SUN Xu,CAO Shidong,BU Guangquan,et al.Construction scheme of overhead line flexible HVDCgrid[J].Power System Technology,2016,40(3):678-682.
[4]吴亚楠,吕铮,贺之渊,等.基于架空线的直流电网保护方案研究[J].中国电机工程学报,2016,36(14):3726-3734.WU Yanan,LüZheng,HE Zhiyuan,et al.Study on the protection strategies of HVDC grid for overhead line application[J].Proceedings of the CSEE,2016,36(14):3726-3734.
[5]严逍,焦彦军,杜哲.基于柔性直流技术的一种交直流混合配电网可行性研究[J].电力系统保护与控制,2017,45(13):110-116.YAN Xiao,JIAO Yanjun,DU Zhe.Feasibility study of AC/DC hybrid distribution network using VSC-based DCtechnology[J].Power System Protection and Control,2017,45(13):110-116.
[6]杨洋,王瑶,李浩涛,等.子模块混合型LCC-MMC混合直流输电系统的启动控制策略[J].电力系统保护与控制,2018,46(8):58-64.YANG Yang,WANG Yao,LI Haotao,et al.Start-up control strategies for the cell-hybrid LCC-MMC hybrid HVDC system[J].Power System Protection and Control,2018,46(8):58-64.
[7]张峻榤,向往,林卫星,等.基于混合型MMC和直流开关的柔性直流电网直流故障保护研究[J].电力建设,2017,38(8):52-58.ZHANG Junjie,XIANG Wang,LIN Weixing,et al.DCfault protection of VSC-HVDC grid based on hybrid MMC and DC switch[J].Electric Power Construction,2017,38(8):52-58.
[8]曹帅,向往,姚良忠,等.风电经混合型MMC-HVDC并网的交直流故障穿越策略[J].电力系统自动化,2018,42(7):37-43,49.CAO Shuai,XIANG Wang,YAO Liangzhong,et al.ACand DC fault ride-through strategies for wind power integration via hybrid MMC-HVDC[J].Automation of Electric Power Systems,2018,42(7):37-43,49.
[9]王振浩,宋金泊,韩子娇,等.基于混合子模块的MMC故障阻断及谐波特性分析[J].电力系统保护与控制,2017,45(8):73-79.WANG Zhenhao,SONG Jinbo,HAN Zijiao,et al.Fault blocking and harmonic characteristics analysis based on hybrid sub-module of MMC[J].Power System Protection and Control,2017,45(8):73-79.
[10]李红梅,行登江,高扬,等.子模块混联MMC-HVDC系统直流侧短路故障电流抑制方法[J].电力系统保护与控制,2016,44(20):57-64.LI Hongmei,XING Dengjiang,GAO Yang,et al.A DCpole-to-pole fault current suppression strategy of the half-and full-bridge based cell-hybrid modular multilevel converter[J].Power System Protection and Control,2016,44(20):57-64.
[11]孔明,汤广福,贺之渊.子模块混合型MMC-HVDC直流故障穿越控制策略[J].中国电机工程学报,2014,34(30):5343-5351.KONG Ming,TANG Guangfu,HE Zhiyuan.A DC fault ride-through strategy for cell-hybrid modular multilevel converter based HVDC transmission systems[J].Proceedings of the CSEE,2014,34(30):5343-5351.
[12]ZENG Rong,XU Lie,YAO Liangzhong,et al.Design and operation of a hybrid modular multilevel converter[J].IEEE Transactions on Power Electronics,2015,30(3):1137-1146.
[13]LIN Weixing,DRAGAN J,SANMUEL N,et al.Full bridge MMC converter optimal design to HVDCoperational requirements[J].IEEE Transactions on Power Delivery,2016,31(3):1342-1350.
[14]CUI Shenghui,SUL S K.A comprehensive DCshort-circuit fault ride through strategy of hybrid modular multilevel converters(MMCs)for overhead line transmission[J].IEEE Transactions on Power Electronics,2016,31(11):7780-7796.
[15]HU Jiabing,XU Kecheng,LIN Lei,et al.Analysis and enhanced control of hybrid-MMC-based HVDC systems during asymmetrical DC voltage faults[J].IEEETransactions on Power Delivery,2017,32(3):1394-1403.
[16]李少华,王秀丽,李泰,等.混合式MMC及其直流故障穿越策略优化[J].中国电机工程学报,2016,36(7):1849-1858.LI Shaohua,WANG Xiuli,LI Tai,et al.Optimal design for hybrid MMC and its DC fault ride-through strategy[J].Proceedings of the CSEE,2016,36(7):1849-1858.
[17]XIANG Wang,LIN Weixing,XU Lie,et al.Enhanced independent pole control of hybrid MMC-HVDC system[J].IEEE Transactions on Power Delivery,2018,33(2):861-872.
[18]宋强,刘文华,李笑倩,等.模块化多电平换流器稳态运行特性的解析分析[J].电网技术,2012,36(11):198-204.SONG Qiang,LIU Wenhua,LI Xiaoqian,et al.An analytical method for analysis on steady-state operating characteristic of modular multilevel converter[J].Power System Technology,2012,36(11):198-204.
[19]刘普,王跃,雷万钧,等.模块化多电平变流器稳态运行特性分析[J].电工技术学报,2015,30(11):90-99.LIU Pu,WANG Yue,LEI Wanjun,et al.Analysis of steady-state operating characteristics for modular multilevel converters[J].Transactions of China Electrotechnical Society,2015,30(11):90-99.
[20]鲁晓军,林卫星,安婷,等.MMC电气系统动态相量模型统一建模方法及运行特性分析[J].中国电机工程学报,2016,36(20):5489-5501.LU Xiaojun,LIN Weixing,AN Ting,et al.A unified dynamic phasor modeling and operating characteristic analysis of electrical system of MMC[J].Proceedings of the CSEE,2016,36(20):5489-5501.
[21]鲁晓军,向往,林卫星,等.混合型模块化多电平换流器解析建模与功率运行区间分析[J].电力系统自动化.2018,42(7):76-84.LU Xiaojun,XIANG Wang,LIN Weixing,et al.Analysis on analytical modeling and power operating zone of hybrid modular multilevel converter[J].Automation of Electric Power Systems,2018,42(7):76-84.