风电高渗透率交直流外送系统直流闭锁稳控方案研究
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摘要
针对特高压直流闭锁后的交流系统暂态过电压问题,深入剖析了直流闭锁后盈余的无功功率、短路容量与交流系统暂态过电压的关系,对比分析了安控切风电与极控切滤波器时序对交流系统暂态过电压的影响。提出基于风电机组故障穿越能力的交流系统稳控方案以及相应的暂态过电压抑制措施。以DIg SILENT为平台搭建哈密电网仿真模型,对所提稳控方案及暂态过电压抑制措施的正确性和可行性进行了仿真验证。仿真结果表明,所提稳控方案及暂态过电压抑制措施可有效降低系统暂态过电压,规避风电机组连锁脱网的风险,并有利于交流系统电压恢复。
Aiming at transient overvoltage problem of Alternating Current(AC) system after Ultra-High Voltage Direct Current(UHVDC) system blocking, surplus reactive power after UHVDC system blocking and short circuit capacity are deduced, and the relationship between these two parameters and transient overvoltage of AC system are analyzed in detail. Subsequently, the influence on AC system transient overvoltage exerted by timing sequence of wind turbines tripping by safety and stability control system and filter tripping by pole control system is analyzed contrastively. A stability control scheme based on wind turbine Fault Ride Through(FRT) capability and the corresponding transient overvoltage suppression strategy are proposed. Lastly, a simulation model of power grid in Hami is established based on DIgSILENT experiment platform to verify the validity and feasibility of the proposed stability control scheme and transient overvoltage suppression strategy. Simulation results verify that the proposed stability control scheme and transient overvoltage suppression strategy can reduce transient overvoltage effectively, avoid the risk of wind turbines cascading trip-off, and promote voltage recovery of AC system.
Aiming at transient overvoltage problem of Alternating Current(AC) system after Ultra-High Voltage Direct Current(UHVDC) system blocking, surplus reactive power after UHVDC system blocking and short circuit capacity are deduced, and the relationship between these two parameters and transient overvoltage of AC system are analyzed in detail. Subsequently, the influence on AC system transient overvoltage exerted by timing sequence of wind turbines tripping by safety and stability control system and filter tripping by pole control system is analyzed contrastively. A stability control scheme based on wind turbine Fault Ride Through(FRT) capability and the corresponding transient overvoltage suppression strategy are proposed. Lastly, a simulation model of power grid in Hami is established based on DIgSILENT experiment platform to verify the validity and feasibility of the proposed stability control scheme and transient overvoltage suppression strategy. Simulation results verify that the proposed stability control scheme and transient overvoltage suppression strategy can reduce transient overvoltage effectively, avoid the risk of wind turbines cascading trip-off, and promote voltage recovery of AC system.
引文
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[19]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.
[20]风电场接入电力系统技术规定:GB/T 19963-2001[S].
[2]邱进,吴士普,汪本进,等.特高压直流换流站分压器预试方法研究[J].电力系统保护与控制,2018,46(3):152-157.QIU Jin,WU Shipu,WANG Benjin,et al.Preventive test method research of UHV DC converter station DCvoltage divider[J].Power System Protection and Control,2018,46(3):152-157.
[3]杨建明,徐斌,王杨正,等.一次特殊的高压直流输电线路故障分析及线路保护优化[J].电力工程技术,2017,36(5):136-142.YANG Jianming,XU Bin,WANG Yangzheng,et al.Analysis of an HVDC transmission line fault and line protection optimization[J].Electric Power Engineering Teachnology,2017,36(5):136-142.
[4]陈虎,张英敏,贺洋,等.特高压交流对四川电网多送出直流输电系统影响评估[J].电力系统保护与控制,2011,39(7):136-141.CHEN Hu,ZHANG Yingmin,HE Yang,et al.Impact assessment of UHVAC on multi-send HVDC systems of Sichuan power grid[J].Power System Protection and Control,2011,39(7):136-141.
[5]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.
[6]FRANKE M,BHADRA N,BHADRA N,et al.Direct current contamination of kilohertz frequency alternating current waveforms[J].Journal of Neuroscience Methods,2014,232.
[7]张开宇,崔勇,庄侃沁,等.加装同步调相机对多直流馈入受端电网的影响分析[J].电力系统保护与控制,2017,45(22):139-143.ZHANG Kaiyu,CUI Yong,ZHUANG Kanqin,et al.Analysis of the influence of synchronous condensers on receiving-end grid with multi-infeed HVDC[J].Power System Protection and Control,2017,45(22):139-143.
[8]陈赟,陈得治,马世英,等.风光火打捆交直流外送系统的高频切机方案研究[J].电网技术,2016,40(1):186-192.CHEN Yun,CHEN Dezhi,MA Shiying,et al.Studies on high-frequency generator tripping strategy for windphotovoltaic-thermal-bundled power transmitted by AC/DC system[J].Power System Technology,2016,40(1):186-192.
[9]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.
[10]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 overvoltage risk analysis of HVDC transmission on atypical conditions[J].Power System Technology,2014,38(12):3459-3463.
[11]贾俊川,张健,仲悟之,等.应对多回并列直流换相失败的送端系统安全稳定控制措施研究[J].中国电机工程学报,2017,37(21):6320-6327.JIA Junchuan,ZHANG Jian,ZHONG Wuzhi,et al.Research on the security and stability control measures of the sending side system coping with multiple parallel-operation HVDCs simultaneous commutation failure[J].Proceedings of the CSEE,2017,37(21):6320-6327.
[12]李婷,刘明波,林舜江,等.针对直流闭锁故障的协调二级电压紧急控制模型[J].电网技术,2012,36(12):137-145.LI Ting,LIU Mingbo,LIN Shunjiang,et al.Acoordinated secondary voltage emergency control model for DC blocking fault[J].Power System Technology,2012,36(12):137-145.
[13]冯长有,陈刚,许涛,等.高压直流输电系统故障后电网安全控制装置调制策略[J].电网技术,2012,36(9):88-94.FENG Changyou,CHEN Gang,XU Tao,etal.Novel modulation strategy of stability-controlling device after failure occurred in HVDC power transmission system[J].Power System Technology,2012,36(9):88-94.
[14]林伟芳,易俊,汤涌,等.分层直流短路比的定义和应用[J].中国电机工程学报,2017,37(22):6627-6635,6775.LIN Weifang,YI Jun,TANG Yong,et al.Definition and application of hierarchical infeed DC short circuit ratio[J].Proceedings of the CSEE,2017,37(22):6627-6635,6775.
[15]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.
[16]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.
[17]MOHSENI M,ISLAM S M.Transient control of DFIG-based wind power plants in compliance with the Australian grid code[J].IEEE Transactions on Power Electronics,2012,27(6):2813-2824.
[18]黄伟煌,许树楷,黄莹,等.特高压多端混合直流输电系统稳态控制策略[J].南方电网技术,2017,11(7):5-10.HUANG Weihuang,XU Shukai,HUANG Ying,et al.Steady-state control strategy of multi-terminal hybrid UHVDC[J].Southern Power System Teghnology,2017,11(7):5-10.
[19]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.
[20]风电场接入电力系统技术规定:GB/T 19963-2001[S].