基于测量导纳变化的微电网群联络线保护方案
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摘要
当多个相邻微电网之间通过低压配电线路互联互供时,则形成微电网群。微电网群内部联络线故障时,方向不定的网络潮流,易变的拓扑结构以及多样的逆变式分布式电源控制策略等因素,给微电网群的保护带来了挑战。文中根据微电网群系统故障前后线路电压和电流的分布特点,提出一种以母线测量导纳量变化量为判据的微电网群内部联络线保护新方案。该方案采用故障前后联络线两端测量导纳的幅值变化为初步判据,选出疑似故障线路,并结合疑似线路两侧导纳相角差的变化实现故障线路识别。该方法原理简单,易于整定,具有较高的灵敏度和可靠性。利用PSCAD/EMTDC进行算例验证,结果证实了该方案的正确性和可靠性。
With increasing interconnection and interaction among the adjacent microgrids,multi-microgrid is formed. Multimicrogrid has many new characteristics,such as bi-directional power flows,flexible operation modes and different control strategy of inverter interfaced distributed generations( IIDGs),which challenge multi-microgrid protection. Based on the voltage and current distribution characteristics of the line parameters,this paper proposes a new protection scheme for internal tie lines fault of multi-microgrid,which takes the change of measured bus admittance as the criterion. First,measured admittance amplitude of both ends of tie lines,before and after the fault are calculated. Then,comparing the admittance amplitude to select the likely faulty lines. Finally,fault line is located on comparison the phase of measured admittance among the likely faulty lines. This scheme with high sensitivity and reliability,has a simple principle and is easy to be adjusted.PSCAD/EMTDC is used in simulation analysis,and simulation results have verified the correctness and effectiveness of the protection scheme.
With increasing interconnection and interaction among the adjacent microgrids,multi-microgrid is formed. Multimicrogrid has many new characteristics,such as bi-directional power flows,flexible operation modes and different control strategy of inverter interfaced distributed generations( IIDGs),which challenge multi-microgrid protection. Based on the voltage and current distribution characteristics of the line parameters,this paper proposes a new protection scheme for internal tie lines fault of multi-microgrid,which takes the change of measured bus admittance as the criterion. First,measured admittance amplitude of both ends of tie lines,before and after the fault are calculated. Then,comparing the admittance amplitude to select the likely faulty lines. Finally,fault line is located on comparison the phase of measured admittance among the likely faulty lines. This scheme with high sensitivity and reliability,has a simple principle and is easy to be adjusted.PSCAD/EMTDC is used in simulation analysis,and simulation results have verified the correctness and effectiveness of the protection scheme.
引文
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[19]卢强.智能微能源网[C]∥2015年中国智能电网学术研讨会,2015.LU Qiang. Smart micro-energy grid[C]∥2015 China's Smart Grid Conference,2015.
[20]王盼宝,王卫,孟尼娜,等.直流微电网离网与并网运行统一控制策略[J].中国电机工程学报,2015,35(17):4388-4396.WANG Panbao,WANG Wei,MENG Nina,et al. Unified control strategy of islanding and grid-connected operations for DC microgrid[J]. Proceedings of the CSEE,2015,35(17):4388-4396.
[21]赵敏,陈颖,沈沉.微电网群特征分析及示范工程设计[J].电网技术,2015,39(6):1469-1476.ZHAO Min,CHEN Ying,SHEN Chen. Characteristic analysis of multi-microgrids and a pilot project[J]. Power System Technology,2015,39(6):1469-1476.
[22]姜斌,牟龙华,郭文明,等.基于母线测量导纳变化的微电网保护[J].电网技术,2015,39(6):1751-1758.JIANG Bin,MU Longhua,GUO Wenming,et al. Microgrid protection based on change of measured bus admittance[J].Power System Technology,2015,39(6):1751-1758.
[2]文凌锋,党广宇,田伟,等.基于多时间尺度风储协同的微电网能量管理策略研究[J].电力工程技术,2018,37(3):123-128.WEN Lingfeng,DANG Guangyu,TIAN Wei,et al. Research on micro-grid energy management system based on multi-time scale[J]. Electric Power Engineering Technology,2018,37(3):123-128.
[3]周小平,陈燕东,周乐明,等.一种微网群架构及其自主协调控制策略[J].电工技术学报,2017,32(10):123-134.ZHOU Xiaoping,CHEN Yandong,ZHOU Leming,et al. A microgrid cluster structure and its autonomous coordination control strategy[J]. Transactions of China Electrotechnical Society,2017,32(10):123-134.
[4]刘剑飞,熊雄.主动配电网下多微电网间功率协调优化研究[J].可再生能源,2017,35(11):1639-1646.LIU Jianfei,XIONG Xiong. Multi-microgrids power optimal dispatch under active distribution system[J]. Renewable Energy Resources,2017,35(11):1639-1646.
[5]周宁,雷响,荆骁睿,等.一种含高渗透率分布式电源配电网自适应过电流保护方案[J].电力系统保护与控制,2016,44(22):24-31.ZHOU Ning,LEI Xiang,JING Xiaorui,et al. Adaptive overcurrent protection scheme for distribution network with high penetration rate of DG[J]. Power System Protection and Control,2016,44(22):24-31.
[6]尹项根,张哲,肖繁,等.分布式电源短路计算模型及电网故障计算方法研究[J].电力系统保护与控制,2015,43(22):1-9.YIN Xianggen,ZHANG Zhe,XIAO Fan,et al. Study on shortcircuit calculation model of distributed generators and fault analysis method of power system with distributed generators[J].Power System Protection and Control,2015,43(22):1-9.
[7]吴争荣,王钢,李海锋,等.含分布式电源配电网的相间短路故障分析[J].中国电机工程学报,2013,33(1):130-136.WU Zhengrong,WANG Gang,LI Haifeng,et al. Analysis on the distribution network with distributed generators under phaseto-phase short-circuit faults[J]. Proceedings of the CSEE,2013,33(1):130-136.
[8]丛伟,田崇稳,赵义术,等.基于电压变化量幅值比的智能配电网故障方向元件[J].电力系统自动化,2014,38(15):93-99.CONG Wei,TIAN Chongwen,ZHAO Yishu,et al. Massive date processing of intermittent energy based on map reduce model[J]. Automation of Electric Power System,2014,38(15):93-99.
[9] DEWADASA M,GHOSH A,LEDWICH G. Protection of microgrids using differential relays[C]∥21st Universities Power Engineering Conference(AUPEC),Australasian,2011:1-6.
[10]贾清泉,孙玲玲,王美娟,等.基于节点搜索的微电网自适应保护方法[J].中国电机工程学报,2014,34(10):1650-1657.JIA Qingquan,SUN Lingling,WANG Meijuan,et al. An adaptive protection method for micro-grid based on node searching[J]. Proceedings of the CSEE, 2014, 34(10):1650-1657.
[11]林霞,陆于平,王联合.分布式发电条件下的新型电流保护方案[J].电力系统自动化,2008,32(20):50-56.LIN Xia,LU Yuping,WANG Lianhe. New current protection scheme considering distributed generation impact[J]. Automation of Electric Power System,2008,32(20):50-56.
[12]MU L,HAN H,JIANG B,et al. Microgrid protection based on principle of fault location[J]. IEEE Transactions on Electrical and Electronic Engineering,2016,11(1):30-35.
[13]范明天,张祖平,苏傲雪,等.主动配电系统可行技术研究[J].中国电机工程学报,2013,33(22):12-18.FAN Mingtian,ZHANG Zuping,SU Aoxue,et al. Enabling technologies for active distribution systems[J]. Proceedings of the CSEE,2013,33(22):12-18.
[14]潘国清,曾德辉,王钢,等.含PQ控制逆变型分布式电源的配电网故障分析方法[J].中国电机工程学报,2014,34(4):555-561.PAN Guoqing,ZENG Dehui,WANG Gang,et al. Fault analysis on distribution network with inverter interfaced distributed generations based on PQ control strategy[J]. Proceedings of the CSEE,2014,34(4):555-561.
[15]韩海娟,牟龙华,郭文明.基于故障分量的微电网保护适用性[J].电力系统自动化,2016,40(3):90-96.HAN Haijuan,MU Longhua,GUO Wenming. Adaptability of microgrid protection based on fault components[J].Automation of Electric Power System,2016,40(3):90-96.
[16]于雷,陈奇芳,段力铭,等.配电网故障情况下多微网互联能力分析[J].电网技术,2015,39(3):682-689.YU Lei,CHEN Qifang,DUAN Liming,et al. Analysis on interconnectivity of multi-microgrids under fault condition of distribution network[J]. Power System Technology,2015,39(3):682-689.
[17]KROPOSKI B,LASSETER R,ISE T,et al. Making microgrid work[J]. IEEE Power and Energy Magazine,2008,3(6):40-53.
[18]SOSHINSKAYA M,CRIJNS-GRAUS W H J,GUERRERO J M,et al. Microgrids:experiences,barriers and success factors[J]. Renewable and Sustainable Energy Reviews,2014,40(1):659-672.
[19]卢强.智能微能源网[C]∥2015年中国智能电网学术研讨会,2015.LU Qiang. Smart micro-energy grid[C]∥2015 China's Smart Grid Conference,2015.
[20]王盼宝,王卫,孟尼娜,等.直流微电网离网与并网运行统一控制策略[J].中国电机工程学报,2015,35(17):4388-4396.WANG Panbao,WANG Wei,MENG Nina,et al. Unified control strategy of islanding and grid-connected operations for DC microgrid[J]. Proceedings of the CSEE,2015,35(17):4388-4396.
[21]赵敏,陈颖,沈沉.微电网群特征分析及示范工程设计[J].电网技术,2015,39(6):1469-1476.ZHAO Min,CHEN Ying,SHEN Chen. Characteristic analysis of multi-microgrids and a pilot project[J]. Power System Technology,2015,39(6):1469-1476.
[22]姜斌,牟龙华,郭文明,等.基于母线测量导纳变化的微电网保护[J].电网技术,2015,39(6):1751-1758.JIANG Bin,MU Longhua,GUO Wenming,et al. Microgrid protection based on change of measured bus admittance[J].Power System Technology,2015,39(6):1751-1758.