直流电抗器对VSC-MTDC输电系统稳定性的影响分析
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摘要
直流电抗器可以限制多端柔性直流输电系统中直流故障电流的上升率,但大容量的直流电抗器又会对系统稳定性产生一定的影响。提出了含有直流电抗器的多端柔性直流输电系统稳定性模型,推导出含交流侧参数、换流站参数以及带直流电抗器的输电线路分布参数的多输入–多输出状态空间矩阵表达式,绘制出不同直流电抗器情况下系统的根轨迹曲线,分析了主导极点的变化情况,确定了不同接收功率下保证系统稳定运行的直流电抗器临界值,为直流电抗器参数的选取提供了理论依据。利用PSCAD/EMTDC软件搭建了三端柔性直流输电系统模型,验证了该理论方法的正确性。
DC reactors can limit rise rate of DC fault current in multi-terminal flexible DC transmission system, but large capacity DC reactors have significant impact on stability of the system. In this paper, a small-signal model of a multi-terminal flexible DC transmission system with DC reactors is proposed and the state-space matrix expression with multi-input and multi-output variables is deduced, including parameters of AC side and converter station and distributed parameters of DC line with DC reactors. The root-locus curves for different DC reactors are drawn, and the critical values of DC reactors under different received powers are determined by analyzing the changes of dominant poles, providing theoretical basis for selecting DC reactor parameters. A three-terminal flexible DC transmission system is established in PSCAD/EMTDC, verifying correctness of the proposed method.
DC reactors can limit rise rate of DC fault current in multi-terminal flexible DC transmission system, but large capacity DC reactors have significant impact on stability of the system. In this paper, a small-signal model of a multi-terminal flexible DC transmission system with DC reactors is proposed and the state-space matrix expression with multi-input and multi-output variables is deduced, including parameters of AC side and converter station and distributed parameters of DC line with DC reactors. The root-locus curves for different DC reactors are drawn, and the critical values of DC reactors under different received powers are determined by analyzing the changes of dominant poles, providing theoretical basis for selecting DC reactor parameters. A three-terminal flexible DC transmission system is established in PSCAD/EMTDC, verifying correctness of the proposed method.
引文
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[17]李国庆,孙银锋,吴学光.柔性直流输电稳定性分析及控制参数整定[J].电工技术学报,2017,32(6):231-239.Li Guoqing,Sun Yinfeng,Wu Xueguang.VSC-HVDC stability analysis and control parameter setting[J].Transactions of China Electrotechnical Society,2017,32(6):231-239(in Chinese).
[18]Wang W,Barnes M,Marjanovic O,et al.Impact of DC breaker systems on multiterminal VSC-HVDC stability[J].IEEE Transactions on Power Delivery,2016,31(2):769-779.
[19]苑宾,李探,许建中,等.联接弱交流电网MMC系统小信号稳定性分析[J].中国电机工程学报,2017,37(18):5339-5349.Yuan Bin,Li Tan,Xu Jianzhong,et al.Small-signal stability analysis of modular multilevel converter connected to a weak AC system[J].Proceedings of the CSEE,2017,37(18):5339-5349(in Chinese).
[20]Hui Li,Jun Liang,Ming Xiong,et al.Analysis of VSC-HVDC system stability with protective reactors[J].International Journal of Electronics and Electrical Engineering,2016,4(5):408-411.
[21]杨佳艺,赵成勇,苑宾.限流电抗器对接入弱交流电网的VSC-HVDC系统的小信号稳定性影响分析[J].华北电力大学学报,2017,44(1):9-15.Yang Jiayi,Zhao Chengyong,Yuan Bin.Impact analysis of current limiting reactor on small signal stability of VSC-HVDC systems connected to the weak AC power grid[J].Journal of North China Electric Power University,2017,44(1):9-15(in Chinese).
[22]王康,金宇清,甘德强,等.电力系统小信号稳定分析与控制综述[J].电力自动化设备,2009,29(5):10-19.Wang Kang,Jin Yuqing,Gan Deqiang,et al.Survey of power system small signal stability and control[J].Electric Power Automation Equipment,2009,29(5):10-19(in Chinese).
[2]安婷,Bjarne Andersen,Norman MacLeod,等.中欧高压直流电网技术论坛综述[J].电网技术,2017,41(8):2407-2416.An Ting,Bjarne Andersen,Norman MacLeod,et al.Overview of Sino-European HVDC grid technical forum[J].Power System Technology,2017,41(8):2407-2416(in Chinese).
[3]吕敬,施刚,蔡旭,等.大型风电场经VSC-HVDC交直流并联系统并网的运行控制策略[J].电网技术,2015,39(3):639-646.LüJing,Shi Gang,Cai Xu,et al.Control strategies of large wind farms integration through AC DC parallel transmission system based on VSC-HVDC[J].Power System Technology,2015,39(3):639-646(in Chinese).
[4]周勤勇.亚洲电网互联模式探讨[J].电网技术,2017,41(5):1491-1497.Zhou Qinyong.Discussion on interconnection mode of Asian power grids[J].Power System Technology,2017,41(5):1491-1497(in Chinese).
[5]丁骁,汤广福,韩民晓,等.柔性直流电网用混合式高压直流断路器特征参数提取及应用[J].中国电机工程学报,2018,38(1):309-319.Ding Xiao,Tang Huangfu,Han Minxiao,et al.Characteristic parameters extraction and application of the hybrid DC circuit breaker in MMC-HVDC[J].Proceedings of the CSEE,2018,38(1):309-319(in Chinese).
[6]杨堤,程浩忠,姚良忠,等.多端直流输电接入下的交直流混联系统电压稳定性研究综述[J].电网技术,2015,39(8):2201-2209.Yang Di,Chen Haozhong,Yao Liangzhong,et al.Research review on AC/DC hybrid system with multi-terminal HVDC[J].Power System Technology,2015,39(8):2201-2209(in Chinese).
[7]李斌,何佳伟.多端柔性直流电网故障隔离技术研究[J].中国电机工程学报,2016,36(1):87-95.Li Bin,He Jiawei.Research on the DC fault isolating technique in multi-terminal DC system[J].Proceedings of the CSEE,2016,36(1):87-95(in Chinese).
[8]李斌,何佳伟,冯亚东,等.多端柔性直流电网保护关键技术[J].电力系统自动化,2016,40(21):2-12.Li Bin,He Jiawei,Feng Yadong,et al.Key techniques for protection of multi-terminal flexible DC grid[J].Automation of Electric Power Systems,2016,40(21):2-12(in Chinese).
[9]董新洲,汤兰西,施慎行,等.柔性直流输电网线路保护配置方案[J].电网技术,2018,42(6):1752-1759.Dong Xinzhou,Tang Lanxi,Shi Shenxing,et al.Configuration scheme of transmission line protection for flexible HVDC grid[J].Power System Technology,2018,42(6):1752-1759(in Chinese).
[10]Kim K,Kim J G,Jung H,et al.Design of a 400 mH 400 A toroid-type HTS DC reactor magnet[J].IEEE Transaction on Applied Superconductivity,2013,23(3):4601104.
[11]李梅航,刘喜梅,陈朋.适用于多端柔性直流输电系统的快速电压裕度控制策略[J].电网技术,2016,40(10):3045-3051.Li Meihang,Liu Ximei,Chen Peng.Fast voltage margin control strategy for VSC-MTDC systems[J].Power System Technology,2016,40(10):3045-3051(in Chinese).
[12]韩民晓,熊凌飞,丁辉.利用电压倾斜控制的VSC-MTDC稳定性分析[J].电网技术,2015,39(7):1808-1813.Han Minxiao,Xiong Lingfei,Ding Hui.Stability analysis of VSC-MTDC with voltage droop control[J].Power System Technology,2015,39(7):1808-1813(in Chinese).
[13]Wang W,Beddard A,Barnes M,et al.Analysis of active power control for VSC-HVDC[J].IEEE Transactions on Power Delivery,2014,29(4):1978-1988.
[14]Beerten J,Cole S,Belmans R.Modeling of multi-terminal VSCHVDC systems with distributed DC voltage control[J].IEEETransactions on Power Systems,2013,99:1-9.
[15]杨洁,刘开培,饶雪,等.多端柔性直流输电系统小信号建模[J].中国电机工程学报,2015,35(16):4015-4024.Yang Jie,Liu Kaipei,Rao Xue,et al.Small signal modeling for VSC-MTDC[J].Proceedings of the CSEE,2015,35(16):4015-4024(in Chinese).
[16]杨洁,刘开培,余俞,等.交流电网互联的双端柔性直流输电系统小信号建模[J].中国电机工程学报,2015,35(9):2177-2184.Yang Jie,Liu Kaipei,Yu Yu,et al.Small signal modeling for VSC-HVDC used in AC grid interconnection[J].Proceedings of the CSEE,2015,35(9):2177-2184(in Chinese).
[17]李国庆,孙银锋,吴学光.柔性直流输电稳定性分析及控制参数整定[J].电工技术学报,2017,32(6):231-239.Li Guoqing,Sun Yinfeng,Wu Xueguang.VSC-HVDC stability analysis and control parameter setting[J].Transactions of China Electrotechnical Society,2017,32(6):231-239(in Chinese).
[18]Wang W,Barnes M,Marjanovic O,et al.Impact of DC breaker systems on multiterminal VSC-HVDC stability[J].IEEE Transactions on Power Delivery,2016,31(2):769-779.
[19]苑宾,李探,许建中,等.联接弱交流电网MMC系统小信号稳定性分析[J].中国电机工程学报,2017,37(18):5339-5349.Yuan Bin,Li Tan,Xu Jianzhong,et al.Small-signal stability analysis of modular multilevel converter connected to a weak AC system[J].Proceedings of the CSEE,2017,37(18):5339-5349(in Chinese).
[20]Hui Li,Jun Liang,Ming Xiong,et al.Analysis of VSC-HVDC system stability with protective reactors[J].International Journal of Electronics and Electrical Engineering,2016,4(5):408-411.
[21]杨佳艺,赵成勇,苑宾.限流电抗器对接入弱交流电网的VSC-HVDC系统的小信号稳定性影响分析[J].华北电力大学学报,2017,44(1):9-15.Yang Jiayi,Zhao Chengyong,Yuan Bin.Impact analysis of current limiting reactor on small signal stability of VSC-HVDC systems connected to the weak AC power grid[J].Journal of North China Electric Power University,2017,44(1):9-15(in Chinese).
[22]王康,金宇清,甘德强,等.电力系统小信号稳定分析与控制综述[J].电力自动化设备,2009,29(5):10-19.Wang Kang,Jin Yuqing,Gan Deqiang,et al.Survey of power system small signal stability and control[J].Electric Power Automation Equipment,2009,29(5):10-19(in Chinese).
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