一种改进的STATCOM暂态无功控制策略
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摘要
对含有STATCOM的HVDC系统在故障恢复过程中发生"二次换相失败"的现象进行了描述和复现。分析了STATCOM无功补偿、HVDC系统控制特性与故障程度三者之间的作用关系,研究表明现有STATCOM无功控制策略在交流侧发生严重故障时会恶化系统恢复特性。基于此,提出了一种改进的STATCOM暂态无功控制策略,根据故障的严重程度差异化配置STATCOM无功补偿模式,保证HVDC系统恢复阶段交流电压稳定,加快系统恢复速度。最后,在PSCAD/EMTDC中对所提控制策略进行了仿真验证,结果表明,随着故障程度的加重所提控制策略可以有效降低系统发生"二次换相失败"的概率,从而显著改善系统的恢复特性。
The phenomenon of "secondary commutation failure" in the process of fault recovery for the HVDC system with STATCOM is described and reproduced. The relationship among STATCOM reactive power compensation, HVDC system control characteristics and fault degree is analyzed. The research shows that the existing STATCOM reactive power control strategy will deteriorate the system recovery characteristics when serious AC side faults occur. Furthermore, an improved STATCOM transient reactive power control strategy is proposed,which can allocate reactive power compensation mode of STATCOM differently according to the fault level. Finally, the proposed control strategy is simulated in PSCAD/EMTDC. The simulation results show that the proposed control strategy can effectively reduce the probability of secondary commutation failure and significantly improve the recovery characteristics of the system.
The phenomenon of "secondary commutation failure" in the process of fault recovery for the HVDC system with STATCOM is described and reproduced. The relationship among STATCOM reactive power compensation, HVDC system control characteristics and fault degree is analyzed. The research shows that the existing STATCOM reactive power control strategy will deteriorate the system recovery characteristics when serious AC side faults occur. Furthermore, an improved STATCOM transient reactive power control strategy is proposed,which can allocate reactive power compensation mode of STATCOM differently according to the fault level. Finally, the proposed control strategy is simulated in PSCAD/EMTDC. The simulation results show that the proposed control strategy can effectively reduce the probability of secondary commutation failure and significantly improve the recovery characteristics of the system.
引文
[1] 浙江大学发电教研组直流输电科研组.直流输电[M].北京:电力工业出版社,1985:16-17.
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[4] 徐政,王世佳,李宁璨,等.适用于远距离大容量架空线路的LCC-MMC 串联混合型直流输电系统[J].电网技术,2016,40(1):55-63.XU Zheng,WANG Shijia,LI Ningcan,et al.A LCC and MMC series hybrid topology suitable for bulk overhead line transmission [J].Power System Technology,2016,40(1):55-63.
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[6] 耿俊成,刘文华,俞旭峰,等.链式 STATCOM 的数学模型[J].中国电机工程学报,2003,23(6):66-70.GENG Juncheng,LIU Wenhua,YU Xufeng,et al.Modelling of cascade STATCOM [J].Proceedings of the CSEE,2003,23(6):66-70.
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[8] 易桂平,胡仁杰,蒋玮,等.电网电压不平衡对STATCOM的影响及抑制[J].电工技术学报,2014,29(6):238-247.YI Guiping,HU Renjie,JIANG Wei,et al.Influence of grid voltage unbalance on STATCOM and the countermeasure [J].Transactions of China Electrotechnical Society,2014,29(6):238-247.
[9] 郭春义,张岩坡,赵成勇,等.STATCOM对双馈入直流系统运行特性的影响[J].中国电机工程学报,2013,33(25):99-106.GUO Chunyi,ZHANG Yanpo,ZHAO Chengyong,et al.Impact of STATCOM on the operating characteristics of double-infeed HVDC System [J].Proceedings of the CSEE,2013,33(25):99-106.
[10] 陈欢,王振,杨治中,等.并联混合直流输电系统中传统直流和柔性直流暂态无功协调控制策略研究[J].电网技术,2017,41(6):1719-1725.CHEN Huan,WANG Zhen,YANG Zhizhong,et al.Coordinated reactive power control approch for LCC-HVDC and VSC-HVDC in hybrid parallel HVDC system [J].Power System Technology,2017,41(6):1719-1725.
[11] 王峰,刘天琪,周胜军,等.谐波对HVDC系统换相失败的影响机理及定量分析方法[J].中国电机工程学报,2015,35(19):4888-4894.WANG Feng,LIU Tianqi,ZHOU Shengjun,et al.Mechanism and quantitative analysis method for HVDC commutation failure resulting from harmonics [J].Proceedings of the CSEE,2015,35(19):4888-4894.
[12] 李思思,白仕雄,丁志林,等.基于换相电流时间面积的换相失败判别方法[J].电力系统及其自动化学报,2013,25(2):98-102.LI Sisi,BAI Shixiong,DING Zhilin,et al.Current-time area method for the identification of commutation failure [J].Proceedings of the CSU-EPSA,2013,25(2):98-102.
[13] 许树楷,罗雨.背靠背输电系统中柔性直流与常规直流的协调控制策略[J].南方能源建设,2016,3(2):9-15.XU Shukai,LUO Yu.Study on coordination control strategy of VSC/LCC BTB HVDC [J].Southern Energy Construction,2016,3(2):9-15.
[14] 郭春义.新型混合双馈入直流输电系统及其相关问题研究[D].北京:华北电力大学,2012.
[2] 赵畹君.高压直流输电工程技术[M].北京:中国电力出版社,2004.
[3] 刘羽超,郭春义,许韦华,等.一种降低直流输电换相失败概率的控制方法[J].电网技术,2015,39(1):76-82.LIU Yuchao,GUO Chunyi,XU Weihua,et al.A control method to reduce commutation failure probability in HVDC Power transmission [J].Power System Technology,2015,39(1):76-82.
[4] 徐政,王世佳,李宁璨,等.适用于远距离大容量架空线路的LCC-MMC 串联混合型直流输电系统[J].电网技术,2016,40(1):55-63.XU Zheng,WANG Shijia,LI Ningcan,et al.A LCC and MMC series hybrid topology suitable for bulk overhead line transmission [J].Power System Technology,2016,40(1):55-63.
[5] 赵成勇,李丹,刘羽超,等.含有STATCOM的高压直流输电系统控制方法[J].高电压技术,2014,40(8):2440-2448.ZHAO Chengyong,LI Dan,LIU Yuchao,et al.Contol method for HVDC system with STATCOM [J].High Voltage Engineering,2014,40(8):2440-2448.
[6] 耿俊成,刘文华,俞旭峰,等.链式 STATCOM 的数学模型[J].中国电机工程学报,2003,23(6):66-70.GENG Juncheng,LIU Wenhua,YU Xufeng,et al.Modelling of cascade STATCOM [J].Proceedings of the CSEE,2003,23(6):66-70.
[7] 王轩,魏宏,欧朱建,等.一种抑制HVDC换相失败的STATCOM补偿方案[J].电力系统保护与控制,2018,46(5):135-142.WANG Xuan,WEI Hong,OU Zhujian,et al.A STATCOM compensation scheme for suppressing commutation failure in HVDC system [J].Power System Protection and Control,2018,46(5):135-142.
[8] 易桂平,胡仁杰,蒋玮,等.电网电压不平衡对STATCOM的影响及抑制[J].电工技术学报,2014,29(6):238-247.YI Guiping,HU Renjie,JIANG Wei,et al.Influence of grid voltage unbalance on STATCOM and the countermeasure [J].Transactions of China Electrotechnical Society,2014,29(6):238-247.
[9] 郭春义,张岩坡,赵成勇,等.STATCOM对双馈入直流系统运行特性的影响[J].中国电机工程学报,2013,33(25):99-106.GUO Chunyi,ZHANG Yanpo,ZHAO Chengyong,et al.Impact of STATCOM on the operating characteristics of double-infeed HVDC System [J].Proceedings of the CSEE,2013,33(25):99-106.
[10] 陈欢,王振,杨治中,等.并联混合直流输电系统中传统直流和柔性直流暂态无功协调控制策略研究[J].电网技术,2017,41(6):1719-1725.CHEN Huan,WANG Zhen,YANG Zhizhong,et al.Coordinated reactive power control approch for LCC-HVDC and VSC-HVDC in hybrid parallel HVDC system [J].Power System Technology,2017,41(6):1719-1725.
[11] 王峰,刘天琪,周胜军,等.谐波对HVDC系统换相失败的影响机理及定量分析方法[J].中国电机工程学报,2015,35(19):4888-4894.WANG Feng,LIU Tianqi,ZHOU Shengjun,et al.Mechanism and quantitative analysis method for HVDC commutation failure resulting from harmonics [J].Proceedings of the CSEE,2015,35(19):4888-4894.
[12] 李思思,白仕雄,丁志林,等.基于换相电流时间面积的换相失败判别方法[J].电力系统及其自动化学报,2013,25(2):98-102.LI Sisi,BAI Shixiong,DING Zhilin,et al.Current-time area method for the identification of commutation failure [J].Proceedings of the CSU-EPSA,2013,25(2):98-102.
[13] 许树楷,罗雨.背靠背输电系统中柔性直流与常规直流的协调控制策略[J].南方能源建设,2016,3(2):9-15.XU Shukai,LUO Yu.Study on coordination control strategy of VSC/LCC BTB HVDC [J].Southern Energy Construction,2016,3(2):9-15.
[14] 郭春义.新型混合双馈入直流输电系统及其相关问题研究[D].北京:华北电力大学,2012.