云南电网对乌东德多端直流适应性分析
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摘要
中国南方电网有限责任公司计划于2019年建成乌东德电站多端直流送出工程,为提高云南电网及多端直流的运行安全水平,需要研究云南电网对乌东德多端直流的适应性。在云南电网不同运行方式下通过仿真分析乌东德电站近区交流线路"N-1"、"N-2"故障,找到造成云南电网失稳或线路过载的交流线路故障,并提出相应的稳控策略;然后在云南电网不同运行方式下对乌东德多端直流故障进行仿真分析,根据结果提出合理的频率限制控制器(frequency limit controller,FLC)设置方案,并校核云南电网现有的高频切机方案对乌东德多端直流故障的适应性。研究表明,乌东德电站近区部分交流线路故障会造成云南电网失稳或者线路过载;在FLC不投入时,现有的高频切机方案会在乌东德多端直流云南侧单极闭锁时动作。针对上述问题,提出相应的稳控措施及FLC设置方案,有效解决了乌东德电站近区交流线路故障造成的系统失稳问题,提高了云南电网高频切机方案对乌东德直流故障的适应性。
CSG plans to complete Wudongde multi-terminal DC transmission project in 2019.In order to improve operating safety of Yunnan power grid and multi-terminal DC,it is required to study adaptability of Yunnan power grid to Wudongde multi-terminal DC.Under different operating modes of Yunnan power grid,this paper makes simulating analysis on"N-1"、"N-2"faults of AC transmission lines near Wudongde power plant so as to find out faults of the AC lines causing unstability of Yunan power grid or overload of lines,and present relevant steady control strategies.Then it carries out simulating analysis on multi-terminal DC faults of Wudongde power plant under different operating modes of Yunnan power grid and according to the analysis results,it presents reasonable frequency limit controller(FLC)configuration scheme and checks adaptability of current over-frequency generator tripping scheme of Yunnan power grid to Wudongde multi-terminal DC fault.Relevant research indicates that faults of parts of AC transmission lines near Wudongde power plant may cause unstability of Yunnan power grid or overload of lines.As FLC is not put into operation,current over-frequency generator tripping scheme will act as the unipolar at Yunnan side of Wudongde multi-terminal DCis blocking.In allusion to the above problems,the paper proposes relevant steady control measures and FLC configuration schems to effectively solve the problem of system unstability caused by faults of AC transmission lines near Wudongde power plant and improve adaptability of over-frequency generator tripping of Yunan power grid to Wudongde DC faults.
CSG plans to complete Wudongde multi-terminal DC transmission project in 2019.In order to improve operating safety of Yunnan power grid and multi-terminal DC,it is required to study adaptability of Yunnan power grid to Wudongde multi-terminal DC.Under different operating modes of Yunnan power grid,this paper makes simulating analysis on"N-1"、"N-2"faults of AC transmission lines near Wudongde power plant so as to find out faults of the AC lines causing unstability of Yunan power grid or overload of lines,and present relevant steady control strategies.Then it carries out simulating analysis on multi-terminal DC faults of Wudongde power plant under different operating modes of Yunnan power grid and according to the analysis results,it presents reasonable frequency limit controller(FLC)configuration scheme and checks adaptability of current over-frequency generator tripping scheme of Yunnan power grid to Wudongde multi-terminal DC fault.Relevant research indicates that faults of parts of AC transmission lines near Wudongde power plant may cause unstability of Yunnan power grid or overload of lines.As FLC is not put into operation,current over-frequency generator tripping scheme will act as the unipolar at Yunnan side of Wudongde multi-terminal DCis blocking.In allusion to the above problems,the paper proposes relevant steady control measures and FLC configuration schems to effectively solve the problem of system unstability caused by faults of AC transmission lines near Wudongde power plant and improve adaptability of over-frequency generator tripping of Yunan power grid to Wudongde DC faults.
引文
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[13]张志强,袁荣湘,徐友平,等.适应多回特高压直流的四川电网高频切机优化[J].电力系统自动化,2016,40(2):141-146.ZHANG Zhiqiang,YUAN Rongxiang,XU Youping,et al.Optimization of over-frequency generator-tripping scheme in Sichuan power grid adaptable to multi-UHVDC transmission project[J].Automation of Electric Power Systems,2016,40(2):141-146.
[14]张志强,徐友平,袁荣湘,等.大型互联区域电网解列后送端电网频率特性及高频切机方案[J].电网技术,2015,39(1):288-293.ZHANG Zhiqiang,XU Youping,YUAN Rongxiang,et al.Frequency characteristics of power grid at sending end of split large-scale interconnected regional power grid and corresponding over-frequency generator-tripping scheme[J].Power System Technology,2015,39(1):288-293.
[15]张东辉.多直流集中馈入受端广东电网发展的思考[J].广东电力,2015,28(8):33-37,100.ZHANG Donghui.Reflect on development of centralized feed-in of multi direct current into receiving-end Guangdong power grid[J].Guangdong Electric Power,2015,28(8):33-37,100.
[16]张丹,吴琛,周磊.异步联网后送端电网频率特性分析及高频切机方案[J].云南电力技术,2017,45(4):133-138.ZHANG Dan,WU Chen,ZHOU Lei.Frequency characteristics of sending system under asynchronous interconnection and corresponding over frequency generator tripping scheme[J].Yunnan Electric Power,2017,45(4):133-138.
[2]马为民,吴方劼,杨一鸣,等.柔性直流输电技术的现状及应用前景分析[J].高电压技术,2014,40(8):2429-2439.MA Weimin,WU Fangjie,YANG Yiming,et al.Flexible HVDC transmission technology’s today and tomorrow[J].High Voltage Engineering,2014,40(8):2429-2439.
[3]程哲,邱生敏,翁振星.云南电网异步联网运行后广西北电南送断面调控分析[J].广东电力,2016,29(10):75-78.CHENG Zhe,QIU Shengmin,WENG Zhengxing.Section regulation and control for Guangxi power transmission from north to south after asynchronous interconnection operation of Yunnan power grid[J].Guangdong Electric Power,2016,29(10):75-78.
[4]蔡葆锐,王兴刚,司大军.异步联网对云南电网安全稳定性的影响[J].云南电力技术,2015,43(1):83-86.CAI Baorui,WANG Xinggang,SI Dajun.Impact of asynchronous networking for Yunnan power grid security and stability[J].Yunnan Electric Power,2015,43(1):83-86.
[5]郭洪芹.异步联网对云南电网稳定特性影响研究[J].云南电力技术,2015,43(10):12-14.GUO hongqin.Impact study on characteristics of Yunnan power grid stability with respect to asynchronous interconnection[J].Yunnan Electric Power,2015,43(10):12-14.
[6]张文亮,汤涌,曾南超.多端高压直流输电技术及应用前景[J].电网技术,2010,34(9):1-6.ZHANG Wenliang,TANG Yong,ZENG Nanchao.Multi-terminal HVDC transmission technologies and application prospects in China[J].Power System Technology,2010,34(9):1-6.
[7]饶宏,洪潮,周保荣,等.乌东德特高压多端直流工程受端采用柔性直流对多直流集中馈入问题的改善作用研究[J].南方电网技术,2017,11(3):1-5.RAO Hong,HONG Chao,ZHOU Baorong,et al.Study on improvement of VSC-MTDC at inverter side of Wudongde multi-terminal UHVDC for the problem of centralized multiinfeed HVDC[J].Southern Power System Technology,2017,11(3):1-5.
[8]杨燕,林勇,徐蔚,等.乌东德多端直流输电对广东电网安全稳定的影响[J].广东电力,2017,30(11):44-50.YANG Yan,LIN Yong,XU Wei,et al.Influence of Wudongde multi-terminal HVDC on security and stability of Guangdong power grid[J].Guangdong Electric Power,2017,30(11):44-50.
[9]邓婧,李兴源,魏巍.汽轮机超速保护控制系统的性能优化及其对电网频率的影响分析[J].电网技术,2010,34(12):50-56.DENG Jing,LI Xingyuan,WEI Wei.Optimization of overspeed protection controller for steam turbine and its influence on frequency of power grid[J].Power System Technology,2010,34(12):50-56.
[10]陈亦平,程哲,张昆,等.高压直流输电系统孤岛运行调频策略[J].中国电机工程学报,2013,33(4):96-102,13.CHEN Yiping,CHENG Zhe,ZHANG Kun,et al.Frequency regulation strategy for island operation of HVDC[J].Proceedings of the CSEE,2013,33(4):96-102,13.
[11]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,2016,10(7):13-16,23.DU Bin,ZHANG Dan,ZHANG Junmin,et al.Stability characteristics and control measures of Yunnan power grid after asynchronous interconnection[J].Southern Power System Technology,2016,10(7):13-16,23.
[12]吕思卓,郑超,杨金刚,等.送端直流孤岛系统频率限制器优化控制策略[J].电力建设,2016,37(2):107-111.LSizhuo,ZHENG Chao,YANG Jingang,et al.FLC optimization control strategy of islanded HVDC sending system[J].Electric Power Construction,2016,37(2):107-111.
[13]张志强,袁荣湘,徐友平,等.适应多回特高压直流的四川电网高频切机优化[J].电力系统自动化,2016,40(2):141-146.ZHANG Zhiqiang,YUAN Rongxiang,XU Youping,et al.Optimization of over-frequency generator-tripping scheme in Sichuan power grid adaptable to multi-UHVDC transmission project[J].Automation of Electric Power Systems,2016,40(2):141-146.
[14]张志强,徐友平,袁荣湘,等.大型互联区域电网解列后送端电网频率特性及高频切机方案[J].电网技术,2015,39(1):288-293.ZHANG Zhiqiang,XU Youping,YUAN Rongxiang,et al.Frequency characteristics of power grid at sending end of split large-scale interconnected regional power grid and corresponding over-frequency generator-tripping scheme[J].Power System Technology,2015,39(1):288-293.
[15]张东辉.多直流集中馈入受端广东电网发展的思考[J].广东电力,2015,28(8):33-37,100.ZHANG Donghui.Reflect on development of centralized feed-in of multi direct current into receiving-end Guangdong power grid[J].Guangdong Electric Power,2015,28(8):33-37,100.
[16]张丹,吴琛,周磊.异步联网后送端电网频率特性分析及高频切机方案[J].云南电力技术,2017,45(4):133-138.ZHANG Dan,WU Chen,ZHOU Lei.Frequency characteristics of sending system under asynchronous interconnection and corresponding over frequency generator tripping scheme[J].Yunnan Electric Power,2017,45(4):133-138.