分层接入方式下锡泰特高压直流输电系统阀组电压平衡控制
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摘要
锡盟—泰州±800kV特高压直流输电工程,采用分层接入的方式,在泰州换流站分别接入1 000kV和500kV交流电网。在这种新型电路结构下,如何保证单极中接入不同电压等级交流电网的两个串联阀组的直流电压均衡,对于直流输电系统的安全稳定运行是非常重要的。结合锡盟—泰州直流工程,在分析直流输电系统控制策略的基础上,对分层接入的阀组电压平衡控制进行研究,提出了电压平衡控制策略和中点分压器容错处理方法。通过RTDS建模试验验证了控制策略的正确性,并在锡盟—泰州特高压直流工程获得应用。
±800kV ultra-high voltage direct current(UHVDC)transmission project from Ximeng to Taizhou is hierarchically connected to 1 000 kV and 500 kV AC grid in Taizhou converter station.As for this new circuit structure,it is very important how to ensure the DC voltage balance of two series valve groups connected to different voltage level AC grid in one pole for the safe and stable operation of HVDC transmission system.Combined with the UHVDC project from Ximeng to Taizhou,on the basis of the analysis of the control strategy of the DC transmission system,the voltage balance control of the series valve groups is studied,and the control strategy of voltage balance and the fault tolerance method of middle point divider are put forward.The RTDS modeling test verifies the correctness of the control strategy and achieves good application results in the HVDC project from Ximeng to Taizhou.
±800kV ultra-high voltage direct current(UHVDC)transmission project from Ximeng to Taizhou is hierarchically connected to 1 000 kV and 500 kV AC grid in Taizhou converter station.As for this new circuit structure,it is very important how to ensure the DC voltage balance of two series valve groups connected to different voltage level AC grid in one pole for the safe and stable operation of HVDC transmission system.Combined with the UHVDC project from Ximeng to Taizhou,on the basis of the analysis of the control strategy of the DC transmission system,the voltage balance control of the series valve groups is studied,and the control strategy of voltage balance and the fault tolerance method of middle point divider are put forward.The RTDS modeling test verifies the correctness of the control strategy and achieves good application results in the HVDC project from Ximeng to Taizhou.
引文
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[14]张庆武,王永平,陈小军,等.特高压直流控制保护系统设计与开发[J].电力系统自动化,2013,37(21):88-93.ZHANG Qingwu,WANG Yongping,CHEN Xiaojun,et al.Design and development of control and protection system for UHVDC[J].Automation of Electric Power Systems,2013,37(21):88-93.
[15]张志朝,刘茂涛,徐攀腾,等.云广特高压直流输电工程同极双阀组关联因素安全风险分析[J].电力系统自动化,2013,37(7):129-133.ZHANG Zhichao,LIU Maotao,XU Panteng,et al.Security risk analysis on interrelated factors between two valve groups in the same pole of Yunnan-Guangdong UHVDC transmission project[J].Automation of Electric Power Systems,2013,37(7):129-133.-1
[2]吴彦维,李晔,陈大鹏,等.10 000MW特高压直流工程受端分层接入交流电网方式下直流控制系统研究[J].电力系统保护与控制,2015,43(18):108-113.WU Yanwei,LI Ye,CHEN Dapeng,et al.Research on control system for 10 000 MW UHVDC station B hierarchical connection to AC grid[J].Power System Protection and Control,2015,43(18):108-113.
[3]王永平,卢东斌,王振曦,等.适用于分层接入的特高压直流输电控制策略[J].电力系统自动化,2016,40(21):59-65.DOI:10.7500/AEPS20160721004.WANG Yongping,LU Dongbin,WANG Zhenxi,et al.Control strategies for UHVDC with hierarchical connection mode[J].Automation of Electric Power Systems,2016,40(21):59-65.DOI:10.7500/AEPS20160721004.
[4]浦莹,历璇,马玉龙,等.网侧分层接入500kV/1 000kV交流电网的特高压直流系统控制保护方案[J].电网技术,2016,40(10):3081-3087.PU Ying,LI Xuan,MA Yulong,et al.Control and protection system scheme on UHVDC with hierarchical connection to500kV/1 000kV AC systems[J].Power System Technology,2016,40(10):3081-3087.
[5]胡铭,田杰,曹冬明,等.特高压直流输电控制系统结构配置分析[J].电力系统自动化,2008,32(24):88-92.HU Ming,TIAN Jie,CAO Dongming,et al.Analysis of structure and configuration for UHVDC transmission control system[J].Automation of Electric Power Systems,2008,32(24):88-92.
[6]张爱玲.溪洛渡送电广东同塔双回直流输电工程控制保护策略研究[J].电力系统保护与控制,2011,39(9):72-76.ZHANG Ailing.Study of control and protection strategies for Xiluodu-Guangdong double HVDC systems erected on the same tower[J].Power System Protection and Control,2011,39(9):72-76.
[7]李少华,王秀丽,张望,等.特高压直流分层接入交流电网方式下直流控制系统设计[J].中国电机工程学报,2015,35(10):2409-2416.LI Shaohua,WANG Xiuli,ZHANG Wang,et al.Control system design for UHVDC hierarchical connection to AC grid[J].Proceedings of the CSEE,2015,35(10):2409-2416.
[8]周君文,刘涛,李少华.云广特高压工程控制系统功能分布研究[J].电力系统保护与控制,2009,37(10):70-75.ZHOU Junwen,LIU Tao,LI Shaohua.Research on control functions in UHVDC system[J].Power System Protection and Control,2009,37(10):70-75.
[9]汤奕,陈斌,皮景创,等.特高压直流分层接入方式下受端交流系统接纳能力分析[J].中国电机工程学报,2016,36(7):1790-1800.TANG Yi,CHEN Bin,PI Jingchuang,et al.Analysis on absorbing ability of receiving AC system for UHVDChierarchical connection to AC grid[J].Proceedings of the CSEE,2016,36(7):1790-1800.
[10]刘茂涛,张志朝,宋述波.云广直流同极双阀组电压平衡控制分析及改进[J].南方电网技术,2014,8(2):24-27.LIU Maotao,ZHANG Zhichao,SONG Shubo.Analysis and improvement of the voltage-balancing control of same-pole dual valve groups in Yunnan-Guangdong DC project[J].Southern Power System Technology,2014,8(2):24-27.
[11]刘永浩,蔡泽祥.PSCAD/EMTDC自定义建模及在直流线路保护仿真中的应用[J].电力系统保护与控制,2011,39(1):119-124.LIU Yonghao,CAI Zexiang.The user-defined model of PSCAD/EMTDC and its application in simulation of HVDCtransmission line protection[J].Power System Protection and Control,2011,39(1):119-124.
[12]孙慧平,王西田.高压直流输电动态向量模型的改进[J].电力系统保护与控制,2013,41(4):21-25.SUN Huiping,WANG Xitian.Improved dynamic phasor model of HVDC[J].Power System Protection and Control,2013,41(4):21-25.
[13]陈大鹏,陈朋,李梅航,等.适用于多端柔性直流输电系统的优化下垂控制策略[J].电力系统自动化,2017,41(9):194-199.DOI:10.7500/AEPS20160805005.CHEN Dapeng,CHEN Peng,LI Meihang,et al.Optimal droop control strategy for voltage source converter based multiterminal direct current system[J].Automation of Electric Power Systems,2017,41(9):194-199.DOI:10.7500/AEPS20160805005.
[14]张庆武,王永平,陈小军,等.特高压直流控制保护系统设计与开发[J].电力系统自动化,2013,37(21):88-93.ZHANG Qingwu,WANG Yongping,CHEN Xiaojun,et al.Design and development of control and protection system for UHVDC[J].Automation of Electric Power Systems,2013,37(21):88-93.
[15]张志朝,刘茂涛,徐攀腾,等.云广特高压直流输电工程同极双阀组关联因素安全风险分析[J].电力系统自动化,2013,37(7):129-133.ZHANG Zhichao,LIU Maotao,XU Panteng,et al.Security risk analysis on interrelated factors between two valve groups in the same pole of Yunnan-Guangdong UHVDC transmission project[J].Automation of Electric Power Systems,2013,37(7):129-133.-1