基于无功功率短路比的直流闭锁暂态过电压计算方法
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摘要
针对现有特高压直流闭锁引起交流系统换流母线暂态过电压计算方法在极低短路比情况下可能无实解的问题,基于直流闭锁后的谐振电路,推导建立了暂态过电压与谐振频率的关系式。参照短路比的定义,提出无功功率短路比的概念,在此基础上,提出适用范围更广的直流闭锁暂态过电压计算方法。研究发现,换流母线暂态过电压随着无功功率短路比的减小呈非线性加速上升的趋势。以DIgSILENT为平台搭建国际大电网会议(CIGRE)直流输电标准测试系统与±800 kV天中直流送端系统,仿真分析验证了所提出的暂态过电压计算方法的有效性,在极低短路比系统中仍然适用。
The existing calculation methods of transient overvoltage on the commutation bus due to the ultra-high voltage direct current(UHVDC) blocking have no real solution in the case of extremely low short-circuit ratio. Based on the resonant circuit after DC blocking, this paper deduces and establishes the expression of the relationship between transient overvoltage and resonant frequency. Referring to the definition of short circuit ratio, the concept of reactive power short-circuit ratio is proposed. Then, a method for calculating transient overvoltage after DC blocking is proposed with wider application range. It is found that the trend of transient overvoltage on the commutation bus is nonlinear and accelerates with the decrease of reactive power short circuit ratio. Finally, based on the DIgSILENT simulation platform, the DC transmission standard test system of International Council on Large Electric Systems and Xinjiang Tianshan-Zhongzhou DC transmission system of China are built to verify the proposed calculation method of transient overvoltage. The simulation results show that the proposed calculation method is effective and applicable in the system with extremely low short-circuit ratio.
The existing calculation methods of transient overvoltage on the commutation bus due to the ultra-high voltage direct current(UHVDC) blocking have no real solution in the case of extremely low short-circuit ratio. Based on the resonant circuit after DC blocking, this paper deduces and establishes the expression of the relationship between transient overvoltage and resonant frequency. Referring to the definition of short circuit ratio, the concept of reactive power short-circuit ratio is proposed. Then, a method for calculating transient overvoltage after DC blocking is proposed with wider application range. It is found that the trend of transient overvoltage on the commutation bus is nonlinear and accelerates with the decrease of reactive power short circuit ratio. Finally, based on the DIgSILENT simulation platform, the DC transmission standard test system of International Council on Large Electric Systems and Xinjiang Tianshan-Zhongzhou DC transmission system of China are built to verify the proposed calculation method of transient overvoltage. The simulation results show that the proposed calculation method is effective and applicable in the system with extremely low short-circuit ratio.
引文
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[13] 袁森,陈得治,罗亚洲,等.直流闭锁冲击弱交流通道的稳定特性及多资源协调控制措施[J].电力自动化设备,2018,38(8):203-210.YUAN Sen,CHEN Dezhi,LUO Yazhou,et al.Stability characteristics and coordinated control measures of multi-resource for DC blocking fault impacting weak AC channel[J].Electric Power Automation Equipment,2018,38(8):203-210.
[14] 钟显,樊艳芳,王一波,等.含高密度风电、交直流送端电网直流闭锁故障稳控方案研究[J].电力系统保护与控制,2015,43(13):130-138.ZHONG Xian,FAN Yanfang,WANG Yibo,et al.Research of stability control strategies for high density wind power,AC-DC sending grid bipole trip[J].Power System Protection and Control,2015,43(13):130-138.
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[16] 吴萍,陈昊,赵兵,等.风光火打捆交直流混联外送系统交互影响及稳定性研究[J].电网技术,2016,40(7):1934-1942.WU Ping,CHEN Hao,ZHAO Bing,et al.Study on interaction and stability characteristics of bundled wind-PV-thermal power transmitted with AC/DC system[J].Power System Technology,2016,40(7):1934-1942.
[17] TU J,PAN Y,ZHANG J,et al.Transient reactive power characteristics of HVDC during commutation failure and impact of HVDC control parameters[J].The Journal of Engineering,2017(13):1134-1139.
[18] 屠竞哲,杨莉,黄涌,等.直流闭锁引发交流联络线功率波动的机理以及峰值计算[J].电力自动化设备,2013,33(1):12-17.TU Jingzhe,YANG Li,HUANG Yong,et al.Mechanism and peak value calculation of AC tie-line power swing caused by DC blocking[J].Electric Power Automation Equipment,2013,33(1):12-17.
[19] 王峰,刘天琪,丁媛媛,等.直流闭锁引起的暂态过电压计算方法及其影响因素分析[J].电网技术,2016,40(10):3059-3065.WANG Feng,LIU Tianqi,DING Yuanyuan,et al.Calculation method and influencing factors of transient overvoltage caused by HVDC block[J].Power System Technology,2016,40(10):3059-3065.
[20] KIM C K.高压直流输电——功率变换在电力系统中的应用[M].北京:机械工业出版社,2014:138-139.KIM C K.Application of HVDC—power conversion in power system[M].Beijing:China Machine Press,2014:138-139.
[2] 郑超,莫品豪,文继锋,等.直流滤波器高压电容器接地故障保护判据和方案[J].电力系统自动化,2018,42(1):132-137.DOI:10.7500/AEPS20170613014.ZHENG Chao,MO Pinhao,WEN Jifeng,et al.Criterion and scheme for high-voltage capacitor earth fault protection of DC filter[J].Automation of Electric Power Systems,2018,42(1):132-137.DOI:10.7500/AEPS20170613014.
[3] 闪鑫,王轶禹,金一丁,等.特高压互联电网一体化监视和故障协同处置方案及应用[J].电力系统自动化,2018,42(2):84-91.DOI:10.7500/AEPS20170320005.SHAN Xin,WANG Yiyu,JIN Yiding,et al.Scheme and application of integrated monitoring and fault co-disposal technology of UHV interconnected power grid[J].Automation of Electric Power Systems,2018,42(2):84-91.DOI:10.7500/AEPS20170320005.
[4] 徐式蕴,吴萍,赵兵,等.哈郑直流受端华中电网基于响应的交直流协调控制措施[J].电网技术,2015,39(7):1773-1778.XU Shiyun,WU Ping,ZHAO Bing,et al.Coordinated control strategy of interconnected grid integrated with UHVDC transmission line from Hami to Zhengzhou[J].Power System Technology,2015,39(7):1773-1778.
[5] 吴萍,林伟芳,孙华东,等.多馈入直流输电系统换相失败机制及特性[J].电网技术,2012,36(5):269-274.WU Ping,LIN Weifang,SUN Huadong,et al.Research and electromechanical transient simulation on mechanism of commutation failure in multi-infeed HVDC power transmission system[J].Power System Technology,2012,36(5):269-274.
[6] 罗煦之,张健,贺静波,等.计及暂态过电压约束的直流闭锁安控与极控协调控制研究[J].电网技术,2015,39(9):2526-2531.LUO Xuzhi,ZHANG Jian,HE Jingbo,et al.Coordinated control research of stability control system and pole control system under DC system block considering transient overvoltage[J].Power System Technology,2015,39(9):2526-2531.
[7] LI F,CHEN Q,LIN X,et al.Simulation on power characteristic of UHVDC during commutation failure and DC block[C]// IEEE Electrical Power and Energy Conference (EPEC),October 22-25,2017,Saskatoon,Canada:6p.
[8] NIE H,SONG W,ZHU Y,et al.Dynamic and static performance optimization of dual active bridge DC-DC converters[J].Journal of Modern Power Systems and Clean Energy,2018,6(3):607-618.
[9] 韩平平,陈凌琦,胡迪,等.直流闭锁暂态过电压对风电外送影响及其抑制措施[J].电力系统保护与控制,2018,46(5):99-105.HAN Pingping,CHEN Lingqi,HU Di,et al.Impact of transient overvoltage caused by DC block on wind power transmission and its suppression measure[J].Power System Protection and Control,2018,46(5):99-105.
[10] 屠竞哲,张健,刘明松,等.风火打捆直流外送系统直流故障引发风机脱网的问题研究[J].电网技术,2015,39(12):3333-3338.TU Jingzhe,ZHANG Jian,LIU Mingsong,et al.Study on wind turbine generators tripping caused by HVDC contingencies of wind-thermal-bundled HVDC transmission systems[J].Power System Technology,2015,39(12):3333-3338.
[11] 贺静波,庄伟,许涛,等.暂态过电压引起风电机组连锁脱网风险分析及对策[J].电网技术,2016,40(6):1839-1844.HE Jingbo,ZHUANG Wei,XU Tao,et al.Study on cascading tripping risk of wind turbines caused by transient overvoltage and its countermeasures[J].Power System Technology,2016,40(6):1839-1844.
[12] 韩平平,张海天,丁明,等.大规模高压直流输电系统闭锁故障下送端风电场高电压穿越的控制策略研究[J].电网技术,2018,42(4):1086-1095.HAN Pingping,ZHANG Haitian,DING Ming,et al.A coordinated HVRT strategy of large-scale wind power transmitted by HVDC system[J].Power System Technology,2018,42(4):1086-1095.
[13] 袁森,陈得治,罗亚洲,等.直流闭锁冲击弱交流通道的稳定特性及多资源协调控制措施[J].电力自动化设备,2018,38(8):203-210.YUAN Sen,CHEN Dezhi,LUO Yazhou,et al.Stability characteristics and coordinated control measures of multi-resource for DC blocking fault impacting weak AC channel[J].Electric Power Automation Equipment,2018,38(8):203-210.
[14] 钟显,樊艳芳,王一波,等.含高密度风电、交直流送端电网直流闭锁故障稳控方案研究[J].电力系统保护与控制,2015,43(13):130-138.ZHONG Xian,FAN Yanfang,WANG Yibo,et al.Research of stability control strategies for high density wind power,AC-DC sending grid bipole trip[J].Power System Protection and Control,2015,43(13):130-138.
[15] 贺静波,万磊,霍超,等.高压直流输电非典型工况下过电压异常风险分析[J].电网技术,2014,38(12):3459-3463.HE Jingbo,WAN Lei,HUO Chao,et al.Abnormal over-voltage risk analysis of HVDC transmission on atypical conditions[J].Power System Technology,2014,38(12):3459-3463.
[16] 吴萍,陈昊,赵兵,等.风光火打捆交直流混联外送系统交互影响及稳定性研究[J].电网技术,2016,40(7):1934-1942.WU Ping,CHEN Hao,ZHAO Bing,et al.Study on interaction and stability characteristics of bundled wind-PV-thermal power transmitted with AC/DC system[J].Power System Technology,2016,40(7):1934-1942.
[17] TU J,PAN Y,ZHANG J,et al.Transient reactive power characteristics of HVDC during commutation failure and impact of HVDC control parameters[J].The Journal of Engineering,2017(13):1134-1139.
[18] 屠竞哲,杨莉,黄涌,等.直流闭锁引发交流联络线功率波动的机理以及峰值计算[J].电力自动化设备,2013,33(1):12-17.TU Jingzhe,YANG Li,HUANG Yong,et al.Mechanism and peak value calculation of AC tie-line power swing caused by DC blocking[J].Electric Power Automation Equipment,2013,33(1):12-17.
[19] 王峰,刘天琪,丁媛媛,等.直流闭锁引起的暂态过电压计算方法及其影响因素分析[J].电网技术,2016,40(10):3059-3065.WANG Feng,LIU Tianqi,DING Yuanyuan,et al.Calculation method and influencing factors of transient overvoltage caused by HVDC block[J].Power System Technology,2016,40(10):3059-3065.
[20] KIM C K.高压直流输电——功率变换在电力系统中的应用[M].北京:机械工业出版社,2014:138-139.KIM C K.Application of HVDC—power conversion in power system[M].Beijing:China Machine Press,2014:138-139.