改善系统频率稳定性的多直流功率紧急支援协调控制策略
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摘要
直流功率紧急支援能够有效改善多直流馈入电网在大功率缺额故障扰动后的系统频率稳定性。文中分析了直流功率紧急支援的原理,提出了一种综合考虑直流过负荷能力、直流运行工况和交流输电能力的单回直流实时可提升功率的估算方法。基于交流电网的安全稳定约束,提出了区域电网最大可支援能力的计算方法和"同送出同馈入"的多回直流实际支援量的协调优化算法。在此基础上,提出了改善系统频率稳定性的多直流功率紧急支援的协调控制方案,并在华东多直流馈入电网中进行了仿真验证。
Emergency DC power support can effectively improve the frequency stability of multi-infeed DC power grids after the disturbance of high-power shortage fault.This paper analyzes the principle of emergency DC power support.Considering the DC overload capacity,DC operation conditions and AC transmission capacity,a method is proposed to estimate the real-time boosting power of single DC line.Based on the safety and stability constraints of DC power transmission network,this paper proposes a calculation method of calculation the maximum supportability of the regional power grid and the coordination and optimization algorithm of the actual support amount of DC lines with the same sending-ends and same receiving-ends.On this basis,the frequency coordinated control scheme of multi-DC power emergency support is proposed and simulated in the East China multi-infeed power grid.
Emergency DC power support can effectively improve the frequency stability of multi-infeed DC power grids after the disturbance of high-power shortage fault.This paper analyzes the principle of emergency DC power support.Considering the DC overload capacity,DC operation conditions and AC transmission capacity,a method is proposed to estimate the real-time boosting power of single DC line.Based on the safety and stability constraints of DC power transmission network,this paper proposes a calculation method of calculation the maximum supportability of the regional power grid and the coordination and optimization algorithm of the actual support amount of DC lines with the same sending-ends and same receiving-ends.On this basis,the frequency coordinated control scheme of multi-DC power emergency support is proposed and simulated in the East China multi-infeed power grid.
引文
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[13]王珂,杨胜春,姚建国,等.考虑无功功率协调控制的并行直流系统紧急功率支援[J].电力系统自动化,2011,35(18):103-107.WANG Ke, YANG Shengchun, YAO Jianguo, et al.Emergency DC power support with reactive power coordinated control for multi-circuit HVDC systems[J].Automation of Electric Power Systems,2011,35(18):103-107.
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[15]徐政.联于弱交流系统的直流输电特性研究之一——直流输电的输送能力[J].电网技术,1997,21(1):12-16.XU Zheng.Characteristics of HVDC connected to weak AC systems:PartⅠHVDC transmission capability[J].Power System Technology,1997,21(1):12-16.
[16]徐政.联于弱交流系统的直流输电特性研究之二——控制方式与电压稳定性[J].电网技术,1997,21(3):1-9.XU Zheng.Characteristics of HVDC connected to weak AC systems:PartⅡcontrol modes and voltage stability[J].Power System Technology,1997,21(3):1-9.
[17]王莹,刘兵,刘天斌,等.特高压直流闭锁后省间紧急功率支援的协调优化调度策略[J].中国电机工程学报,2015,35(11):2695-2702.WANG Ying,LIU Bing,LIU Tianbin,et al.Coordinated optimal dispatching of emergency power support among provinces after UHVDC transmission system block fault[J].Proceedings of the CSEE,2015,35(11):2695-2702.
[18]李兆伟,翟海保,刘福锁,等.多馈入交直流混联受端电网直流接入能力研究评述[J].电力系统保护与控制,2016,44(8):142-148.LI Zhaowei,ZHAI Haibao,LIU Fusuo,et al.DC access capability study for multi-infeed HVDC power transmission system[J].Power System Protection and Control,2016,44(8):142-148.
[2]郭小江,马世英,卜广全,等.上海多馈入直流系统的无功控制策略[J].电网技术,2009,33(7):30-35.GUO Xiaojiang,MA Shiying,BU Guangquan,et al.Reactive power control strategy for Shanghai multi-infeed DC system[J].Power System Technology,2009,33(7):30-35.
[3]鲍颜红,王永昆,方勇杰,等.基于广域测量信息和直流功率支援的低频振荡抑制方法[J].电力系统自动化,2013,37(21):118-122.BAO Yanhong,WANG Yongkun,FANG Yongjie,et al.DC power support for damping low frequency oscillations based on WAMS[J].Automation of Electric Power Systems,2013,37(21):118-122.
[4]刘红超,李兴源,王路,等.多馈入直流输电系统中直流调制的协调优化[J].电网技术,2004,28(1):5-9.LIU Hongchao,LI Xingyuan,WANG Lu,et al.Coordination and optimization of HVDC modulations in multi-infeed HVDC transmission system[J].Power System Technology,2004,28(1):5-9.
[5]何剑,孙华东,郭剑波,等.直流功率调制抑制交流联络线随机功率波动的研究[J].中国电机工程学报,2013,33(25):93-98.HE Jian,SUN Huadong,GUO Jianbo,et al.Suppressing AC tie-line stochastic power fluctuation by HVDC power modulation control[J].Proceedings of the CSEE,2013,33(25):93-98.
[6]付红军,潘励哲,林涛,等.基于改进模拟植物生长算法的PSS与直流调制的协调优化[J].电力自动化设备,2013,33(11):75-80.FU Hongjun,PAN Lizhe,LIN Tao,et al.Coordinative optimization of PSS and DC-modulation based on improved PGSA[J].Electric Power Automation Equipment,2013,33(11):75-80.
[7]束洪春,董俊,孙士云,等.直流调制对南方电网交直流混联输电系统暂态稳定裕度的影响[J].电网技术,2006,30(20):29-33.SHU Hongchun,DONG Jun,SUN Shiyun,et al.Study on advancing transient stability margin in AC/DC hybrid transmission system of Southern China power grid by HVDC modulation[J].Power System Technology,2006,30(20):29-33.
[8]李兆伟,任先成,刘福锁,等.交直流并联电网中直流功率紧急控制影响及优化研究[J].电力系统保护与控制,2014,42(20):104-109.LI Zhaowei,REN Xiancheng,LIU Fusuo,et al.Research on effects and optimization of emergency DC power control in AC/DC hybrid power grid[J].Power System Protection and Control,2014,42(20):104-109.
[9]谢惠藩,张尧,夏成军.特高压紧急直流功率支援策略研究[J].电力自动化设备,2008,28(8):1-7.XIE Huifan,ZHANG Yao,XIA Chengjun.Study of UHV emergency DC power support strategy[J].Electric Power Automation Equipment,2008,28(8):1-7.
[10]余涛,沈善德,王明新,等.三峡-华东HVDC辅助频率控制的动模试验[J].电力系统自动化,2003,27(20):77-81.YU Tao,SHEN Shande,WANG Mingxin,et al.Dynamic simulation experiment of auxiliary frequency control for Three Gorges HVDC transmission lines[J].Automation of Electric Power Systems,2003,27(20):77-81.
[11]朱红萍,罗隆福.直流调制策略改善交直流混联系统的频率稳定性研究[J].中国电机工程学报,2012,32(16):36-43.ZHU Hongping,LUO Longfu.Improving frequency stability of parallel AC-DC hybrid systems by power modulation strategy of HVDC link[J].Proceedings of the CSEE,2012,32(16):36-43.
[12]余涛,沈善德,任震.华中-华东多回HVDC紧急功率转移控制的研究[J].电网技术,2004,28(12):1-4.YU Tao,SHEN Shande,REN Zhen.Research on emergency power shifting control of multi-circuit HVDC systems from Central China power grid to East China power grid[J].Power System Technology,2004,28(12):1-4.
[13]王珂,杨胜春,姚建国,等.考虑无功功率协调控制的并行直流系统紧急功率支援[J].电力系统自动化,2011,35(18):103-107.WANG Ke, YANG Shengchun, YAO Jianguo, et al.Emergency DC power support with reactive power coordinated control for multi-circuit HVDC systems[J].Automation of Electric Power Systems,2011,35(18):103-107.
[14]赵畹君.高压直流输电工程技术[M].北京:中国电力出版社,2004.ZHAO Wanjun.Technology for HVDC transmission project[M].Beijing:China Electric Power Press,2004.
[15]徐政.联于弱交流系统的直流输电特性研究之一——直流输电的输送能力[J].电网技术,1997,21(1):12-16.XU Zheng.Characteristics of HVDC connected to weak AC systems:PartⅠHVDC transmission capability[J].Power System Technology,1997,21(1):12-16.
[16]徐政.联于弱交流系统的直流输电特性研究之二——控制方式与电压稳定性[J].电网技术,1997,21(3):1-9.XU Zheng.Characteristics of HVDC connected to weak AC systems:PartⅡcontrol modes and voltage stability[J].Power System Technology,1997,21(3):1-9.
[17]王莹,刘兵,刘天斌,等.特高压直流闭锁后省间紧急功率支援的协调优化调度策略[J].中国电机工程学报,2015,35(11):2695-2702.WANG Ying,LIU Bing,LIU Tianbin,et al.Coordinated optimal dispatching of emergency power support among provinces after UHVDC transmission system block fault[J].Proceedings of the CSEE,2015,35(11):2695-2702.
[18]李兆伟,翟海保,刘福锁,等.多馈入交直流混联受端电网直流接入能力研究评述[J].电力系统保护与控制,2016,44(8):142-148.LI Zhaowei,ZHAI Haibao,LIU Fusuo,et al.DC access capability study for multi-infeed HVDC power transmission system[J].Power System Protection and Control,2016,44(8):142-148.