柔性电磁环网控制保护系统研究与设计
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摘要
对贵州电网存在大量500/220 kV电磁环网运行无法在短期内实施解环的特性,实现开环运行容易降低供电可靠性,合环运行面临潮流控制困难、短路电流超标这一矛盾问题。而系统运行主要是以提高局部电网运行可靠性为目的这一背景。提出了采用柔性直流输电系统安装于电磁环网低压侧通道实现合环运行的方案。利用柔直的不向系统注入短路电流、有功无功可实现独立解耦控制等众多优势。研究了这种方案下柔直的控制保护系统系统方案的基本策略,包括柔性直流输电系统的基本保护策略,基于贵州电网环网的整体控制保护不同控层级的设计原则及设计方案。最后以贵州六枝、普定变的220 kV的电压层级安装柔性直流背靠背装置为仿真研究对象,仿真结果表明:该设计方案可以有效的保护柔直在电磁环网应用场景下的的安全稳定运行。
In view of the fact that a large number of 500/220 kV electromagnetic loop networks in Guizhou power grid can not be operated in a short time,the open-loop operation is easy to reduce the reliability of power supply,and the closed-loop operation is faced with the contradiction of power flow control difficulty and short-circuit current exceeding the standard. The operation of the system is mainly aimed at improving the reliability of local power grid. A flexible HVDC system installed in the low-voltage side channel of electromagnetic loop network is proposed to realize loop closing operation. Many advantages such as injecting short-circuit current into flexible and direct non-directional system,active and reactive power can be used to realize independent decoupling control. The basic strategy of the flexible and direct control and protection system under this scheme is studied,including the basic protection strategy of the flexible HVDC transmission system,the design principles and design schemes of different control levels based on the overall control and protection of Guizhou power grid ring network. Finally,the flexible DC back-to-back device installed at 220 kV voltage level of Liuzhi and Puding transformers in Guizhou Province is taken as the simulation object. The simulation results show that the design scheme can effectively protect the safe and stable operation of flexible direct current in the electromagnetic loop network application scenario.
In view of the fact that a large number of 500/220 kV electromagnetic loop networks in Guizhou power grid can not be operated in a short time,the open-loop operation is easy to reduce the reliability of power supply,and the closed-loop operation is faced with the contradiction of power flow control difficulty and short-circuit current exceeding the standard. The operation of the system is mainly aimed at improving the reliability of local power grid. A flexible HVDC system installed in the low-voltage side channel of electromagnetic loop network is proposed to realize loop closing operation. Many advantages such as injecting short-circuit current into flexible and direct non-directional system,active and reactive power can be used to realize independent decoupling control. The basic strategy of the flexible and direct control and protection system under this scheme is studied,including the basic protection strategy of the flexible HVDC transmission system,the design principles and design schemes of different control levels based on the overall control and protection of Guizhou power grid ring network. Finally,the flexible DC back-to-back device installed at 220 kV voltage level of Liuzhi and Puding transformers in Guizhou Province is taken as the simulation object. The simulation results show that the design scheme can effectively protect the safe and stable operation of flexible direct current in the electromagnetic loop network application scenario.
引文
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[31]FERNANDO MARTINEZRODRIGO,SANTIAGO DE PABLO,L.CARLOSHERRERODE LUCAS.Current control of a modular multilevel converter for HVDC applications[J].Renewable Energy,2015,83:318-331.
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[33]康鹏,刘蔚,林成,等.一种基于柔性直流技术的送端电网电磁环网解环方法[J].广东电力,2016,29(11):86-92.
[34]KANG Peng,LIU Wei,LIN Cheng,et al.A method for opening electromagnetic loop network of sending-end power grid based on VSC HVDC technology[J].Guangdong Electric Power,2016,29(11):86-92.
[35]胡金,辛也平.500 k V/220 k V电磁环网运行分析[J],内蒙古电力技术,2017,35(03):97-100.
[36]HU Jin,XIN Yeping.Running analysis of 500 kV/220 kVelectromagnetic loop network[J].Inner Mongolia Electric Power,2017,35(03):97-100.
[37][20]吴海涛,王世祥.柔性直流智能配电网的保护配置与动作策略研究[J],电力大数据2018,20(02):74-80.
[38]WU Haitao,WANG Shixiang.Analysis of protection configuration and action strategy on flexible DC transmission and distribution network in megalopolis[J].Power systems and big data.2018,20(02):74-80.
[2]DONG Yunlong,BAO Hailong,TIAN Jie,et al.Control and protection system for VSC-HVDC[J].Automation of Electric Power Systems,2011,35(19):89-92.
[3]梁少华,田杰,曹冬明,等.柔性直流输电系统控制保护方案[J].电力系统自动化,2013,37(15):59-65.
[4]LIANG Shaohua,TIAN Jie,CAO Dongming,et al.A control and protection scheme for VSC-HVDC system[J].Automation of Electric Power Systems,2013,37(15):59-65.
[5]董云龙,胡兆庆,田杰,等.多端柔性直流控制保护系统架构和策略[J].南方能源建设,2016,3(02):21-26.
[6]DONG Yunlong,HU Zhaoqing,TIAN Jie,et al.Frame of control protection system and control strategy implement in multi-terminal VSC-HVDC system[J].Southern Energy Construction,2016,3(02):21-26.
[7]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(09):124-128.
[8]TU Xiaogang,LUO Haiyun,CHENG Xiaoxuan,et al.Control and protection system interface design for multi-terminal HVDC flexible project[J].Power System Protection and Control,2015,43(09):124-128.
[9]赵岩,胡学浩,汤广福,等.模块化多电平变流器HVDC输电系统控制策略[J].中国电机工程学报,2011,31(25):35-42.
[10]ZHAO Yan,HU Xuehao,TANG Guangfu,et al.Control strategy of modular multilevel converters based HVDC transmission[J].Proceedings of the CSEE,2011,31(25):35-42.
[11]赵成勇,陈晓芳,曹春刚,等.模块化多电平换流器HVDC直流侧故障控制保护策略[J].电力系统自动化,2011,35(23):82-87.
[12]ZHAO Chengyong,CHEN Xiaofang,CAO Chungang,et al.Control and protection strategies for MMC-HVDC under DC faults[J].Automation of Electric Power Systems,2011,35(23):82-87.
[13]唐庚,徐政,刘昇,等.适用于多端柔性直流输电系统的新型直流电压控制策略[J].电力系统自动化,2013,37(15):125-132.
[14]TANG Geng,XU Zheng,LIU Sheng,et al.A novel DC voltage control strategy for VSC-MTDC systems[J].Automation of Electric Power Systems,2013,37(15):125-132.
[15]杨晓峰,郑琼林.基于MMC环流模型的通用环流抑制策略[J].中国电机工程学报,2012,32(18):59-64.
[16]YANG Xiaofeng,ZHENG Trillion.A novel universal circulating current suppressing strategy based on the MMC circulating current model[J].ProceedingsoftheCSEE,2012,32(18):59-64.
[17]张建坡,赵成勇.模块化多电平换流器环流及抑制策略研究[J].电工技术学报,2013,28(10):328-336.
[18]ZHANG Jianpo,ZHAO Chengyong.Research on circulation current and suppressing strategy of modular multilevel converter[J].Transactions of China Electrotechnical Society,2013,28(10):328-336.
[19]李健,陈卓.双端有源MMC-HVDC系统的控制策略研究[J].电力大数据,2018,21(07):14-21
[20]LI Jian,CHEN Zhuo.Research on control strategy of two-terminal MMC-HVDC supplying active networks[J].Power Systems and Big Data,2018,21(07):14-21.
[21]徐政,陈海荣.电压源换流器型直流输电技术综述[J].高电压技术,2007,33(01):1-9.
[22]XU Zheng,CHEN Hairong.Review and application of VSC HVDC[J].High Voltage Engineering,2007,33(01):1-9.
[23]孔祥平,李鹏,黄浩声,等.统一潮流控制器对线路纵联保护的影响分析[J].电力系统保护与控制,2017,45(02):14-21.
[24]KONG Xiangping,LI Peng,HUANG Haosheng,et al.Impact analysis of unified power flow controller on transmission line pilot protection[J].Power System Protection and Control,2017,45(02):14-21.
[25]蔡新红,赵成勇.模块化多电平换流器型高压直流输电系统控制保护体系框架[J].电力自动化设备,2013,33(09):157-163.
[26]CAI Xinghong,ZHAO Chengyong.Framework of control and protection system for MMC-HVDC transmission system[J].Electric Power Automation Equipment,2013,33(09):157-163.
[27]张望,黄利军,郝俊芳,等.高压直流输电控制保护系统的冗余设计[J].电力系统保护与控制,2009,37(13):88-91.
[28]ZHANG Wang,HUANG Lijun,HAO Junfang,et al..Redundant design of control and protection system for HVDC transmission[J].Power System Protection and Control,2009,37(13):88-91.
[29]陈海荣,徐政.适用于VSC-MTDC系统的直流电压控制策略[J].电力系统自动化,2006,30(19):28-33.
[30]CHEN Hairong,XU Zheng.A noval DC voltage control strategy for VSC based multi-terminal HVDC system[J].Automation of Electric Power Systems,2006,30(19):28-33.
[31]FERNANDO MARTINEZRODRIGO,SANTIAGO DE PABLO,L.CARLOSHERRERODE LUCAS.Current control of a modular multilevel converter for HVDC applications[J].Renewable Energy,2015,83:318-331.
[32]M Kong,Y Qiu,HE Zhiyuan,et al.Pre-charging control strategies of modular multilevel converter for VSC-HVDC[J].Power System Technology,2011,35(11):67-73.
[33]康鹏,刘蔚,林成,等.一种基于柔性直流技术的送端电网电磁环网解环方法[J].广东电力,2016,29(11):86-92.
[34]KANG Peng,LIU Wei,LIN Cheng,et al.A method for opening electromagnetic loop network of sending-end power grid based on VSC HVDC technology[J].Guangdong Electric Power,2016,29(11):86-92.
[35]胡金,辛也平.500 k V/220 k V电磁环网运行分析[J],内蒙古电力技术,2017,35(03):97-100.
[36]HU Jin,XIN Yeping.Running analysis of 500 kV/220 kVelectromagnetic loop network[J].Inner Mongolia Electric Power,2017,35(03):97-100.
[37][20]吴海涛,王世祥.柔性直流智能配电网的保护配置与动作策略研究[J],电力大数据2018,20(02):74-80.
[38]WU Haitao,WANG Shixiang.Analysis of protection configuration and action strategy on flexible DC transmission and distribution network in megalopolis[J].Power systems and big data.2018,20(02):74-80.