考虑分布式电源稳定助增效应的电压修正反时限过电流保护方案
|
摘要
为解决由于分布式电源(distributed generation,DG)助增效应导致传统保护方案难以同时满足选择性和灵敏性要求的难题,从理论上揭示DG接入前后反时限过电流保护动作行为特性随故障点位置移动的变化规律,分析DG接入对反时限过电流保护性能造成的影响,提出一种具有高灵敏性的电压修正反时限过电流(voltage correction based inverse-time overcurrent,VCITO)保护方案,利用故障下电网电压的自然分布与测量电压随故障位置移动的变化规律,构造电压修正因子与电压梯度指数对反时限特性曲线进行修正。VCITO保护方案基于保护本地信息整定动作时间,在确保保护选择性的同时实现速动性最优化。利用PSCAD/EMTDC建立典型35k V含DG电网模型对VCITO保护方案进行验证,仿真结果表明该方案能有效解决传统反时限过电流保护在DG接入场景中存在的选择性失配与速动性弱化问题,且具有较强的灵敏性。
To solve the problem that traditional protection scheme can hardly satisfy the requirements of both coordination and sensitivity with distributed generation(DG) infeed effect, the operating behavior characteristics of inverse-time overcurrent protection with the changing of fault location with and without DG connection were revealed. The impacts of DG to the performance of inverse-time overcurrent protection were analyzed. A voltage correction based inverse-time overcurrent(VCITO) protection method with high sensitivity was proposed in this paper. Voltage correction factor and voltage correction gradient exponent, which are constructed based on the voltage natural distribution under fault and the change law of measuring voltage with the changing of fault location, was used to correct the inverse-time characteristic curve. The operating time of VCITO protection was obtained based on local information and it can ensure the coordination meanwhile the optimization of operating speed. A typical 35 k V model with DG was established in PSCAD/EMTDC and the simulation results proved that VCITO protection can solve the coordination and operating speed problems with DG connection and its sensitivity is high.
To solve the problem that traditional protection scheme can hardly satisfy the requirements of both coordination and sensitivity with distributed generation(DG) infeed effect, the operating behavior characteristics of inverse-time overcurrent protection with the changing of fault location with and without DG connection were revealed. The impacts of DG to the performance of inverse-time overcurrent protection were analyzed. A voltage correction based inverse-time overcurrent(VCITO) protection method with high sensitivity was proposed in this paper. Voltage correction factor and voltage correction gradient exponent, which are constructed based on the voltage natural distribution under fault and the change law of measuring voltage with the changing of fault location, was used to correct the inverse-time characteristic curve. The operating time of VCITO protection was obtained based on local information and it can ensure the coordination meanwhile the optimization of operating speed. A typical 35 k V model with DG was established in PSCAD/EMTDC and the simulation results proved that VCITO protection can solve the coordination and operating speed problems with DG connection and its sensitivity is high.
引文
[1]贺家李,李永丽,董新洲,等.电力系统继电保护原理[M].4版.北京:中国电力出版社,2010.He Jiali,Li Yongli,Dong Xinzhou,et al.Principle of electrical system's relay protection[M].4th ed.Beijing:China Electric Power Press,2010(in Chinese).
[2]林湘宁,刘沛,杨春明,等.基于小波分析的超高压输电线路无通信全线速动保护方案[J].中国电机工程学报,2001,21(6):9-14.Lin Xiangning,Liu Pei,Yang Chunming,et al.A wavelet analysis based non-communitcation protection scheme for transmission lines[J].Proceedings of the CSEE,2001,21(6):9-14(in Chinese).
[3]Chung J L,Lu Ying,Kao W S,et al.Study of solving the coordination curve intersection of inverse-time overcurrent relays in subtransmission systems[J].IEEETransactions on Power Delivery,2008,23(4):1780-1788.
[4]Birla D,Maheshwari R P,Gupta H O.An approach to tackle the threat of sympathy trips in directional overcurrent relay coordination[J].IEEE Transactions on Power Delivery,2007,22(2):851-858.
[5]王江海,邰能灵,宋凯,等.考虑继电保护动作的分布式电源在配电网中的准入容量研究[J].中国电机工程学报,2010,30(22):37-43.Wang Jianghai,Tai Nengling,Song Kai,et al.Penetration level permission of for DG in distributed network considering relay protection[J].Proceedings of the CSEE,2010,30(22):37-43(in Chinese).
[6]周孝信,鲁宗相,刘应梅,等.中国未来电网的发展模式和关键技术[J].中国电机工程学报,2014,34(29):4999-5008.Zhou Xiaoxin,Lu Zongxiang,Liu Yingmei,et al.Development models and key technologies of future grid in China[J].Proceedings of the CSEE,2014,34(29):4999-5008(in Chinese).
[7]童宁,林湘宁,李正天,等.对称电压跌落条件下双馈风电机群馈出电流与线路电流保护的交互影响[J].中国电机工程学报,2014,34(22):3806-3814.Tong Ning,Lin Xiangning,Li Zhengtian,et al.Study for reciprocal effect between overcurrent protection and doubly-fed induction generator feeding current under the condition of symmetrical voltage sag[J].Proceedings of the CSEE,2014,34(22):3806-3814(in Chinese).
[8]吕志鹏,盛万兴,钟庆昌,等.虚拟同步发电机及其在微电网中的应用[J].中国电机工程学报,2014,34(16):2591-2603.LüZhipeng,Sheng Wanxing,Zhong Qingchang,et al.Virtual synchronous generator and its applications in micro-grid[J].Proceedings of the CSEE,2014,34(16):2591-2603(in Chinese).
[9]Bevrani H,Ise T,Miura Y.Virtual synchronous generators:a survey and new perspectives[J].International Journal of Electrical Power&Energy Systems,2014,54:244-254.
[10]郑天文,陈来军,陈天一,等.虚拟同步发电机技术及展望[J].电力系统自动化,2015,39(21):165-175.Zheng Tianwen,Chen Laijun,Chen Tianyi,et al.Review and prospect of virtual synchronous generator technologies[J].Automation of Electric Power Systems,2015,39(21):165-175(in Chinese).
[11]Sorrentino E,Salazar O,Chavez D.Limit curves by power system's transient stability for the inverse-time overcurrent relays[J].IEEE Transactions on Power Delivery,2011,26(3):1727-1733.
[12]王文焕,杨国生,王德林,等.分布式电源对380 V低压配电网熔断器保护的影响研究[J].电网技术,2015,39(7):2029-2033.Wang Wenhuan,Yang Guosheng,Wang Delin,et al.Analysis of the impact of DG on fuse protector of380V low-voltage distribution network[J].Power System Technology,2015,39(7):2029-2033(in Chinese).
[13]郭煜华,姜军,范春菊,等.改进的配电网反时限过电流保护[J].电力自动化设备,2015,35(10):45-50.Guo Yuhua,Jiang Jun,Fan Chunju,et al.Improved inverse-time over-current protection for distribution network[J].Electric Power Automation Equipment,2015,35(10):45-50(in Chinese).
[14]Baran M,El-Markabi I.Adaptive over current protection for distribution feeders with distributed generators[C]//Proceedings of IEEE PES Power Systems Conference and Exposition.New York,NY:IEEE,2004:715-719.
[15]黄文焘,邰能灵,杨霞.微网反时限低阻抗保护方案[J].中国电机工程学报,2014,34(1):105-114.Huang Wentao,Tai Nengling,Yang Xia.Inverse-time low-impedance protection scheme for microgrids[J].Proceedings of the CSEE,2014,34(1):105-114(in Chinese).
[16]许偲轩,陆于平,王业.基于边电压的反时限微网保护方案[J].电力系统自动化,2014,38(1):68-73.Xu Sixuan,Lu Yuping,Wang Ye.A section voltage based inverse timing protection method for microgrid[J].Automation of Electric Power Systems,2014,38(1):68-73(in Chinese).
[17]Benmouyal G,Meisinger M,Burnworth J,et al.IEEEstandard inverse-time characteristic equations for overcurrent relays[J].IEEE Transactions on Power Delivery,1999,14(3):868-872.
[18]Pena R,Clare J C,Asher G M.A doubly fed induction generator using back-to-back PWM converters supplying an isolated load from a variable speed wind turbine[J].IEE Proceedings-Electric Power Applications,1996,143(5):380-387.
[19]周武仲.继电保护、自动装置及二次回路应用基础[M].北京:中国电力出版社,2013.Zhou Wuzhong.Application base of relay protection,automatic device and secondary circuit[M].Beijing:China Electric Power Press,2013(in Chinese).
[20]冯匡一,袁季修,宋继成,等.GB/T 14285-2006继电保护和安全自动装置技术规程[S].北京:中国标准出版社,2006.Feng Kuangyi,Yuan Jixiu,Song Jicheng,et al.GB/T14285-2006 Technical code for relaying protection and security automatic equipment[S].Beijing:Standard Press of China,2006(in Chinese).
[2]林湘宁,刘沛,杨春明,等.基于小波分析的超高压输电线路无通信全线速动保护方案[J].中国电机工程学报,2001,21(6):9-14.Lin Xiangning,Liu Pei,Yang Chunming,et al.A wavelet analysis based non-communitcation protection scheme for transmission lines[J].Proceedings of the CSEE,2001,21(6):9-14(in Chinese).
[3]Chung J L,Lu Ying,Kao W S,et al.Study of solving the coordination curve intersection of inverse-time overcurrent relays in subtransmission systems[J].IEEETransactions on Power Delivery,2008,23(4):1780-1788.
[4]Birla D,Maheshwari R P,Gupta H O.An approach to tackle the threat of sympathy trips in directional overcurrent relay coordination[J].IEEE Transactions on Power Delivery,2007,22(2):851-858.
[5]王江海,邰能灵,宋凯,等.考虑继电保护动作的分布式电源在配电网中的准入容量研究[J].中国电机工程学报,2010,30(22):37-43.Wang Jianghai,Tai Nengling,Song Kai,et al.Penetration level permission of for DG in distributed network considering relay protection[J].Proceedings of the CSEE,2010,30(22):37-43(in Chinese).
[6]周孝信,鲁宗相,刘应梅,等.中国未来电网的发展模式和关键技术[J].中国电机工程学报,2014,34(29):4999-5008.Zhou Xiaoxin,Lu Zongxiang,Liu Yingmei,et al.Development models and key technologies of future grid in China[J].Proceedings of the CSEE,2014,34(29):4999-5008(in Chinese).
[7]童宁,林湘宁,李正天,等.对称电压跌落条件下双馈风电机群馈出电流与线路电流保护的交互影响[J].中国电机工程学报,2014,34(22):3806-3814.Tong Ning,Lin Xiangning,Li Zhengtian,et al.Study for reciprocal effect between overcurrent protection and doubly-fed induction generator feeding current under the condition of symmetrical voltage sag[J].Proceedings of the CSEE,2014,34(22):3806-3814(in Chinese).
[8]吕志鹏,盛万兴,钟庆昌,等.虚拟同步发电机及其在微电网中的应用[J].中国电机工程学报,2014,34(16):2591-2603.LüZhipeng,Sheng Wanxing,Zhong Qingchang,et al.Virtual synchronous generator and its applications in micro-grid[J].Proceedings of the CSEE,2014,34(16):2591-2603(in Chinese).
[9]Bevrani H,Ise T,Miura Y.Virtual synchronous generators:a survey and new perspectives[J].International Journal of Electrical Power&Energy Systems,2014,54:244-254.
[10]郑天文,陈来军,陈天一,等.虚拟同步发电机技术及展望[J].电力系统自动化,2015,39(21):165-175.Zheng Tianwen,Chen Laijun,Chen Tianyi,et al.Review and prospect of virtual synchronous generator technologies[J].Automation of Electric Power Systems,2015,39(21):165-175(in Chinese).
[11]Sorrentino E,Salazar O,Chavez D.Limit curves by power system's transient stability for the inverse-time overcurrent relays[J].IEEE Transactions on Power Delivery,2011,26(3):1727-1733.
[12]王文焕,杨国生,王德林,等.分布式电源对380 V低压配电网熔断器保护的影响研究[J].电网技术,2015,39(7):2029-2033.Wang Wenhuan,Yang Guosheng,Wang Delin,et al.Analysis of the impact of DG on fuse protector of380V low-voltage distribution network[J].Power System Technology,2015,39(7):2029-2033(in Chinese).
[13]郭煜华,姜军,范春菊,等.改进的配电网反时限过电流保护[J].电力自动化设备,2015,35(10):45-50.Guo Yuhua,Jiang Jun,Fan Chunju,et al.Improved inverse-time over-current protection for distribution network[J].Electric Power Automation Equipment,2015,35(10):45-50(in Chinese).
[14]Baran M,El-Markabi I.Adaptive over current protection for distribution feeders with distributed generators[C]//Proceedings of IEEE PES Power Systems Conference and Exposition.New York,NY:IEEE,2004:715-719.
[15]黄文焘,邰能灵,杨霞.微网反时限低阻抗保护方案[J].中国电机工程学报,2014,34(1):105-114.Huang Wentao,Tai Nengling,Yang Xia.Inverse-time low-impedance protection scheme for microgrids[J].Proceedings of the CSEE,2014,34(1):105-114(in Chinese).
[16]许偲轩,陆于平,王业.基于边电压的反时限微网保护方案[J].电力系统自动化,2014,38(1):68-73.Xu Sixuan,Lu Yuping,Wang Ye.A section voltage based inverse timing protection method for microgrid[J].Automation of Electric Power Systems,2014,38(1):68-73(in Chinese).
[17]Benmouyal G,Meisinger M,Burnworth J,et al.IEEEstandard inverse-time characteristic equations for overcurrent relays[J].IEEE Transactions on Power Delivery,1999,14(3):868-872.
[18]Pena R,Clare J C,Asher G M.A doubly fed induction generator using back-to-back PWM converters supplying an isolated load from a variable speed wind turbine[J].IEE Proceedings-Electric Power Applications,1996,143(5):380-387.
[19]周武仲.继电保护、自动装置及二次回路应用基础[M].北京:中国电力出版社,2013.Zhou Wuzhong.Application base of relay protection,automatic device and secondary circuit[M].Beijing:China Electric Power Press,2013(in Chinese).
[20]冯匡一,袁季修,宋继成,等.GB/T 14285-2006继电保护和安全自动装置技术规程[S].北京:中国标准出版社,2006.Feng Kuangyi,Yuan Jixiu,Song Jicheng,et al.GB/T14285-2006 Technical code for relaying protection and security automatic equipment[S].Beijing:Standard Press of China,2006(in Chinese).
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |