考虑受端电压水平的异步互联紧急控制协调策略研究
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摘要
当送端电网仅通过多条高压/特高压常规直流或柔性直流线路与受端电网相连构成异步互联电网时,若大容量直流发生闭锁,将引发送端及受端系统的频率及电压问题。本文针对异步联网后的多直流孤岛系统,基于直流系统的快速性及可控性,提出一种针对直流闭锁故障紧急状态下功率支援的协调控制策略。首先,通过综合考虑交流电网强弱、潮流转移的影响,提出了考虑受端电压水平的有功功率分配算法。其次,通过对直流功率提升/回降、FLC、稳控切机以及分轮次切机等不同控制措施的协调配合,提出了一套多直流孤岛系统协调控制策略。最后构建了一套协调控制系统并通过南方电网2016年夏大方式下的RTDS仿真模型验证了此系统的有效性。
When an asynchronous interconnected power grid is formed with the sending power grid connected to the receiving end only by a series of HV/UHV DC or flexible DC lines,large capacity DC blocking will occur,which will lead to frequency and voltage problems in the sending and receiving end.In this paper,for the multi-DC island system after asynchronous interconnecting network,a coordinated control strategy for power support under DC blocking emergency fault is proposed based on the fastness and controllability of DC system.Firstly,the active power allocation algorithm is proposed considering the voltage level at the receiving end by analyzing the influence of the strength of AC power grid and the power flow transfer.Secondly,through the coordination of such different control measures as DC power RUN UP/RUN BACK,FLC,cutting machine by the stabilization control device and sub-round cutting machine,a coordinated control strategy of multi-DC islanded systems is proposed.Finally,a set of coordinated control system is built,and the effectiveness of the system is verified through the RTDS simulation of the South China Power Grid in summer 2016.
When an asynchronous interconnected power grid is formed with the sending power grid connected to the receiving end only by a series of HV/UHV DC or flexible DC lines,large capacity DC blocking will occur,which will lead to frequency and voltage problems in the sending and receiving end.In this paper,for the multi-DC island system after asynchronous interconnecting network,a coordinated control strategy for power support under DC blocking emergency fault is proposed based on the fastness and controllability of DC system.Firstly,the active power allocation algorithm is proposed considering the voltage level at the receiving end by analyzing the influence of the strength of AC power grid and the power flow transfer.Secondly,through the coordination of such different control measures as DC power RUN UP/RUN BACK,FLC,cutting machine by the stabilization control device and sub-round cutting machine,a coordinated control strategy of multi-DC islanded systems is proposed.Finally,a set of coordinated control system is built,and the effectiveness of the system is verified through the RTDS simulation of the South China Power Grid in summer 2016.
引文
[1]南方电网技术研究中心.楚穗直流孤岛运行专题分析报告[R].广州:南方电网技术研究中心,2010.
[2]吴宝英,陈允鹏,陈旭,等.±800kV云广直流输电工程对南方电网安全稳定的影响[J].电网技术,2006,30(22):5-12.
[3]李兴源.高压直流输电系统的运行与控制[M].北京:科学出版社,1998:191-224.
[4]赵畹君.高压直流输电工程技术[M].北京:中国电力出版社,2004:91-121.
[5]马玉龙,石岩,殷威扬,等.HVDC送端孤岛运行方式的附加控制策略[J].电网技术,2006,30(24):22-25.
[6]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.
[7]段瑶,陈龙,张步涵,等.华中电网的直流紧急功率支援问题[J].电网技术,2012,36(2):104-109.
[8]王英涛,汤涌,丁理杰,等.新型电力系统失步广域控制技术研发[J].电网技术,2013,37(7):1827-1833.
[9]谢欢,张保会,沈宇,等.基于WAMS的电力系统暂态紧急控制启动方案[J].电网技术,2009,33(20):59-64.
[10]张英敏,陈虎,李兴源,等.基于直流功率支援因子的紧急直流功率支援策略研究[J].四川大学学报,2011,43(5):175-178.
[11]林桥,李兴源,王曦.基于直流综合支援因子的多直流紧急功率支援策略研究[J].华东电力,2013(7):1431-1435.
[12]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):103-106.
[13]李亚男,马为民,殷威扬,等.向家坝-上海特高压直流系统孤岛运行方式[J].高电压技术,2010,36(1):185-189.
[14]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.
[15]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.
[16]许爱东,金小明,贺静波,等.特高压直流输电系统调制研究[J].南方电网技术,2008,8(4):55-58.
[17]周保荣,金小明,吴小辰,等.特高压直流对交直流并联电网安全稳定影响[J].南方电网技术,2010,4(2):31-34.
[18]杜斌,张丹,张军民,等.异步联网后云南电网的稳定特性与控制措施[J].南方电网技术,2016(7):13-16,23.
[19]郭小江,马世英,卜广全,等.上海多馈入系统的无功控制策略[J].电网技术,2009,33(7):30-35.
[20]任祖怡,左洪波,吴小辰,等.用于安全稳定控制的高压直流极闭锁判据[J].电力系统自动化,2007,31(10):41-44.
[2]吴宝英,陈允鹏,陈旭,等.±800kV云广直流输电工程对南方电网安全稳定的影响[J].电网技术,2006,30(22):5-12.
[3]李兴源.高压直流输电系统的运行与控制[M].北京:科学出版社,1998:191-224.
[4]赵畹君.高压直流输电工程技术[M].北京:中国电力出版社,2004:91-121.
[5]马玉龙,石岩,殷威扬,等.HVDC送端孤岛运行方式的附加控制策略[J].电网技术,2006,30(24):22-25.
[6]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.
[7]段瑶,陈龙,张步涵,等.华中电网的直流紧急功率支援问题[J].电网技术,2012,36(2):104-109.
[8]王英涛,汤涌,丁理杰,等.新型电力系统失步广域控制技术研发[J].电网技术,2013,37(7):1827-1833.
[9]谢欢,张保会,沈宇,等.基于WAMS的电力系统暂态紧急控制启动方案[J].电网技术,2009,33(20):59-64.
[10]张英敏,陈虎,李兴源,等.基于直流功率支援因子的紧急直流功率支援策略研究[J].四川大学学报,2011,43(5):175-178.
[11]林桥,李兴源,王曦.基于直流综合支援因子的多直流紧急功率支援策略研究[J].华东电力,2013(7):1431-1435.
[12]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):103-106.
[13]李亚男,马为民,殷威扬,等.向家坝-上海特高压直流系统孤岛运行方式[J].高电压技术,2010,36(1):185-189.
[14]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.
[15]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.
[16]许爱东,金小明,贺静波,等.特高压直流输电系统调制研究[J].南方电网技术,2008,8(4):55-58.
[17]周保荣,金小明,吴小辰,等.特高压直流对交直流并联电网安全稳定影响[J].南方电网技术,2010,4(2):31-34.
[18]杜斌,张丹,张军民,等.异步联网后云南电网的稳定特性与控制措施[J].南方电网技术,2016(7):13-16,23.
[19]郭小江,马世英,卜广全,等.上海多馈入系统的无功控制策略[J].电网技术,2009,33(7):30-35.
[20]任祖怡,左洪波,吴小辰,等.用于安全稳定控制的高压直流极闭锁判据[J].电力系统自动化,2007,31(10):41-44.