MMC型多端柔性直流配电系统协同控制与故障电流抑制策略
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摘要
针对基于直流母线以模块化多电平换流器(Modular Multilevel Converter, MMC)构成的多端柔性直流配电系统,参照实际直流工程,建立了连接低压直流设备的三端模块化多电平换流器等效网络数学模型,并基于下垂控制改进了协同控制控制策略。同时,针对配电系统换流站没有换流变压器的情况,设计了零序电流抑制环节。在PSCAD/EMTDC上搭建了多端柔直配电系统的仿真平台。验证了所设计协同控制策略可以使有功-无功功率的调节更加平稳,减少系统在异常情况下直流电压的波动;在发生交流侧单相接地瞬时故障时,零序电流抑制环节可以抑制过电流,保护设备,降低了换流站配置时的冗余度。
Aiming at the multi-terminal flexible DC power distribution system which is based on DC bus with Modularized Multilevel Converter(MMC), this paper establishes the mathematical model of the 3-terminal MMC system connected with low voltage device and improves the coordinate control scheme based on the droop control method, referred to practical project. To avoid the usage of converter transformer, this paper designs zero sequence current restrain control loop. The case study is carried out on a simulation system built in PSCAD/EMTDC. The time domain simulation results prove the validity of the proposed control scheme. The active and reactive power can be reallocated stably by the proposed coordinate control scheme and the DC voltage suffers less fluctuation when system exception happens; the zero sequence current can be eliminated by the proposed zero sequence current restrain control loop, which is good for reducing over current and protecting the converter.
Aiming at the multi-terminal flexible DC power distribution system which is based on DC bus with Modularized Multilevel Converter(MMC), this paper establishes the mathematical model of the 3-terminal MMC system connected with low voltage device and improves the coordinate control scheme based on the droop control method, referred to practical project. To avoid the usage of converter transformer, this paper designs zero sequence current restrain control loop. The case study is carried out on a simulation system built in PSCAD/EMTDC. The time domain simulation results prove the validity of the proposed control scheme. The active and reactive power can be reallocated stably by the proposed coordinate control scheme and the DC voltage suffers less fluctuation when system exception happens; the zero sequence current can be eliminated by the proposed zero sequence current restrain control loop, which is good for reducing over current and protecting the converter.
引文
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[9]蔡新红,赵成勇.基于欧拉-拉格朗日模型的模块化多电平换流器的无源控制[J].电工技术学报,2013,28(10):224-232.CAI Xinhong,ZHAO Chengyong.Euler-Lagrange model based passive control for modular multilevel converter[J].Transactions of China Electrotechnical Society,2013,28(10):224-232.
[10]赵成勇,胡静,翟晓萌,等.模块化多电平换流器桥臂电抗器参数设计方法[J].电力系统自动化,2013,37(15):89-94.ZHAO Chengyong,HU Jing,ZHAI Xiaomeng,et al.Aparameter design method of bridge arm reactor in modular multilevel converter[J].Automation of Electric Power Systems,2013,37(15):89-94.
[11]管敏渊,徐政.向无源网络供电的MMC型直流输电系统建模与控制[J].电工技术学报,2013,28(2):255-263.GUAN Minyuan,XU Zheng.Modeling and control of modular multilevel converter based VSC-HVDC system connected to passive networks[J].Transactions of China Electrotechnical Society,2013,28(2):255-263.
[12]皇甫成,汤广福,阮江军,等.VSC-HVDC统一电磁暂态模型及其控制策略[J].电网技术,2008,34(5):903-908.HUANGFU Cheng,TANG Guangfu,RUAN Jiangjun,et al.Unified electromagnetic transient model and control strategy for the voltage source converter based HVDCtransmission[J].Power System Technology,2008,34(5):903-908.
[13]TANG Geng,XU Zheng,DONG Huanfeng,et al.Sliding mode robust control based active-power modulation of multi-terminal HVDC transmissions[J].IEEE Transactions on Power Systems,2016,31(2):1614-1623.
[14]周洋,胡鹏飞,江道灼,等.模块化多电平换流器改进最近电平调制策略[J].浙江大学学报(工学版),2015,49(8):1522-1528.ZHOU Yang,HU Pengfei,JIANG Daozhuo,et al.Improved nearest level modulation strategy for modular multilevel converters[J].Journal of Zhejiang University(Engineering Science),2015,49(8):1522-1528.
[15]李宁,袁旭峰,胡晟,等.基于MMC柔性多端直流配电系统的改进协调控制研究[J].贵州大学学报(自然科学版),2017,34(2):40-45,69.LI Ning,YUAN Xufeng,HU Sheng,et al.Research on improved coordinated control based on MMC flexible multipoint DC distribution system[J].Journal of Guizhou University(Natural Sciences),2017,34(2):40-45,69.
[16]GUAN Minyuan,XU Zheng.Modeling and control of a modular multilevel converter based HVDC system under unbalanced grid conditions[J].IEEE Transactions on Power Electronics,2012,27(12):4858-4867.
[17]林雪华,洪国巍,郭琦,等.基于改进MOPSO的MMC控制参数多机联合优化[J].电力系统保护与控制,2017,45(9):48-55.LIN Xuehua,HONG Guowei,GUO Qi,et al.Multimachine joint parameters optimization of MMC controller based on improved MOPSO[J].Power System Protection and Control,2017,45(9):48-55.
[18]薛花,李杨,王育飞,等.MMC-HVDC无源性PI稳定控制与环流抑制方法[J].电力系统保护与控制,2017,45(19):78-85.XUE Hua,LI Yang,WANG Yufei,et al.Passivity-based PI stability control and circulating current suppression method of MMC-HVDC[J].Power System Protection and Control,2017,45(19):78-85.
[19]孙刚,时伯年,赵宇明,等.基于MMC的柔性直流配电网故障定位及保护配置研究[J].电力系统保护与控制,2015,43(22):127-133.SUN Gang,SHI Bonian,ZHAO Yuming,et al.Research on the fault location method and protection configuration strategy of MMC based DC distribution grid[J].Power System Protection and Control,2015,43(22):127-133.
[20]GUAN Minyuan,XU Zheng.Modeling and control of a modular multilevel converter based HVDC system under unbalanced grid conditions[J].IEEE Transactions on Power Electronics,2012,27(12):4858-4867.
[21]刘辉昭,陈晓霞.分数阶同步磁阻电机的混沌与控制[J].河南师范大学学报(自然科学版),2017,45(4):47-52,110.LIU Huizhao,CHEN Xiaoxia.Chaos in the fractional order synchronous reluctance motor and its control[J].Journal of Henan Normal University(Natural Science Edition),2017,45(4):47-52,110.
[22]徐雨哲,徐政,张哲任,等.基于LCC和混合型MMC的混合直流输电系统控制策略[J].广东电力,2018,31(9):13-25.XU Yuzhe,XU Zheng,ZHANG Zheren,et al.Control strategy for hybrid HVDC transmission system based on LCC and hybrid MMC[J].Guangdong Electric Power,2018,31(9):13-25.
[23]曾繁耀,乐开平,韩韬.MMC低开关频率子模块均压控制策略[J].广东电力,2018,31(6):99-106.ZENG Fanyao,YUE Kaiping,HAN Tao.Voltage-sharing control strategy for MMC low switching frequency sub-module[J].Guangdong Electric Power,2018,31(6):99-106.
[24]叶海智,刘骏飞.基于用户评论的协同过滤推荐算法[J].河南师范大学学报(自然科学版),2017,45(1):79-84.YE Haizhi,LIU Junfei.Collaborative filtering recommendation algorithm based on user comments[J].Journal of Henan Normal University(Natural Science Edition),2017,45(1):79-84.
[2]蒋冠前,李志勇,杨慧霞,等.柔性直流输电系统拓扑结构研究综述[J].电力系统保护与控制,2015,43(15):145-153.JIANG Guanqian,LI Zhiyong,YANG Huixia,et al.Research review on topological structure of flexible HVDCsystem[J].Power System Protection and Control,2015,43(15):145-153.
[3]涂小刚,罗海云,程晓绚,等.多端柔性直流输电工程控保系统接口设计[J].电力系统保护与控制,2015,43(9):124-128.TU Xiaogang,LUO Haiyun,CHENG Xiaoxuan,et al.Control and protection system interface design for multiterminal HVDC flexible project[J].Power System Protection and Control,2015,43(9):124-128.
[4]杨柳,黎小林,许树楷,等.南澳多端柔性直流输电示范工程系统集成设计方案[J].南方电网技术,2015,9(1):63-67.YANG Liu,LI Xiaolin,XU Shukai,et al.The integrated system design scheme of Nan'ao VSC-MTDCdemonstration project[J].Southern Power System Technology,2015,9(1):63-67.
[5]李亚男,蒋维勇,余世峰,等.舟山多端柔性直流输电工程系统设计[J].高电压技术,2014,40(8):2490-2496.LI Yanan,JIANG Weiyong,YU Shifeng,et al.System design of Zhoushan multi-terminal VSC-HVDCtransmission project[J].High Voltage Engineering,2014,40(8):2490-2496.
[6]蒋晓娟,姜芸,尹毅,等.上海南汇风电场柔性直流输电示范工程研究[J].高电压技术,2015,41(4):1132-1139.JIANG Xiaojuan,JIANG Yun,YIN Yi,et al.Ademonstration project of flexible DC power transmission in Shanghai Nanhui wind power station[J].High Voltage Engineering,2015,41(4):1132-1139.
[7]唐庚,徐政,薛英林,等.基于模块化多电平换流器的多端柔性直流输电控制系统设计[J].高电压技术,2013,39(11):2773-2782.TANG Geng,XU Zheng,XUE Yinglin,et al.Control design of multi-terminal HVDC based on modular multilevel converter[J].High Voltage Engineering,2013,39(11):2773-2782.
[8]姚致清,于飞,赵倩,等.基于模块化多电平换流器的大型光伏并网系统仿真研究[J].中国电机工程学报,2013,33(36):27-33.YAO Zhiqing,YU Fei,ZHAO Qian,et al.Simulation research on large-scale PV grid-connected systems based on MMC[J].Proceedings of the CSEE,2013,33(36):27-33.
[9]蔡新红,赵成勇.基于欧拉-拉格朗日模型的模块化多电平换流器的无源控制[J].电工技术学报,2013,28(10):224-232.CAI Xinhong,ZHAO Chengyong.Euler-Lagrange model based passive control for modular multilevel converter[J].Transactions of China Electrotechnical Society,2013,28(10):224-232.
[10]赵成勇,胡静,翟晓萌,等.模块化多电平换流器桥臂电抗器参数设计方法[J].电力系统自动化,2013,37(15):89-94.ZHAO Chengyong,HU Jing,ZHAI Xiaomeng,et al.Aparameter design method of bridge arm reactor in modular multilevel converter[J].Automation of Electric Power Systems,2013,37(15):89-94.
[11]管敏渊,徐政.向无源网络供电的MMC型直流输电系统建模与控制[J].电工技术学报,2013,28(2):255-263.GUAN Minyuan,XU Zheng.Modeling and control of modular multilevel converter based VSC-HVDC system connected to passive networks[J].Transactions of China Electrotechnical Society,2013,28(2):255-263.
[12]皇甫成,汤广福,阮江军,等.VSC-HVDC统一电磁暂态模型及其控制策略[J].电网技术,2008,34(5):903-908.HUANGFU Cheng,TANG Guangfu,RUAN Jiangjun,et al.Unified electromagnetic transient model and control strategy for the voltage source converter based HVDCtransmission[J].Power System Technology,2008,34(5):903-908.
[13]TANG Geng,XU Zheng,DONG Huanfeng,et al.Sliding mode robust control based active-power modulation of multi-terminal HVDC transmissions[J].IEEE Transactions on Power Systems,2016,31(2):1614-1623.
[14]周洋,胡鹏飞,江道灼,等.模块化多电平换流器改进最近电平调制策略[J].浙江大学学报(工学版),2015,49(8):1522-1528.ZHOU Yang,HU Pengfei,JIANG Daozhuo,et al.Improved nearest level modulation strategy for modular multilevel converters[J].Journal of Zhejiang University(Engineering Science),2015,49(8):1522-1528.
[15]李宁,袁旭峰,胡晟,等.基于MMC柔性多端直流配电系统的改进协调控制研究[J].贵州大学学报(自然科学版),2017,34(2):40-45,69.LI Ning,YUAN Xufeng,HU Sheng,et al.Research on improved coordinated control based on MMC flexible multipoint DC distribution system[J].Journal of Guizhou University(Natural Sciences),2017,34(2):40-45,69.
[16]GUAN Minyuan,XU Zheng.Modeling and control of a modular multilevel converter based HVDC system under unbalanced grid conditions[J].IEEE Transactions on Power Electronics,2012,27(12):4858-4867.
[17]林雪华,洪国巍,郭琦,等.基于改进MOPSO的MMC控制参数多机联合优化[J].电力系统保护与控制,2017,45(9):48-55.LIN Xuehua,HONG Guowei,GUO Qi,et al.Multimachine joint parameters optimization of MMC controller based on improved MOPSO[J].Power System Protection and Control,2017,45(9):48-55.
[18]薛花,李杨,王育飞,等.MMC-HVDC无源性PI稳定控制与环流抑制方法[J].电力系统保护与控制,2017,45(19):78-85.XUE Hua,LI Yang,WANG Yufei,et al.Passivity-based PI stability control and circulating current suppression method of MMC-HVDC[J].Power System Protection and Control,2017,45(19):78-85.
[19]孙刚,时伯年,赵宇明,等.基于MMC的柔性直流配电网故障定位及保护配置研究[J].电力系统保护与控制,2015,43(22):127-133.SUN Gang,SHI Bonian,ZHAO Yuming,et al.Research on the fault location method and protection configuration strategy of MMC based DC distribution grid[J].Power System Protection and Control,2015,43(22):127-133.
[20]GUAN Minyuan,XU Zheng.Modeling and control of a modular multilevel converter based HVDC system under unbalanced grid conditions[J].IEEE Transactions on Power Electronics,2012,27(12):4858-4867.
[21]刘辉昭,陈晓霞.分数阶同步磁阻电机的混沌与控制[J].河南师范大学学报(自然科学版),2017,45(4):47-52,110.LIU Huizhao,CHEN Xiaoxia.Chaos in the fractional order synchronous reluctance motor and its control[J].Journal of Henan Normal University(Natural Science Edition),2017,45(4):47-52,110.
[22]徐雨哲,徐政,张哲任,等.基于LCC和混合型MMC的混合直流输电系统控制策略[J].广东电力,2018,31(9):13-25.XU Yuzhe,XU Zheng,ZHANG Zheren,et al.Control strategy for hybrid HVDC transmission system based on LCC and hybrid MMC[J].Guangdong Electric Power,2018,31(9):13-25.
[23]曾繁耀,乐开平,韩韬.MMC低开关频率子模块均压控制策略[J].广东电力,2018,31(6):99-106.ZENG Fanyao,YUE Kaiping,HAN Tao.Voltage-sharing control strategy for MMC low switching frequency sub-module[J].Guangdong Electric Power,2018,31(6):99-106.
[24]叶海智,刘骏飞.基于用户评论的协同过滤推荐算法[J].河南师范大学学报(自然科学版),2017,45(1):79-84.YE Haizhi,LIU Junfei.Collaborative filtering recommendation algorithm based on user comments[J].Journal of Henan Normal University(Natural Science Edition),2017,45(1):79-84.