园区直流微电网的故障分析及保护配置方案研究
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摘要
首先,基于园区直流微电网的构成和特点,分析了不同接地方式的故障特性及其对故障检测装置的要求,并推导了故障电压、电流响应曲线。其次,根据电力电子变压器拓扑结构,证明欠阻尼条件下电流不存在振荡问题。再次,对采取保护配置方案前后的短路电流进行对比,同时考虑故障时设备安全及保护配合等因素,给出了保护配置方案的约束条件。最后,基于PSCAD/EMTDC平台搭建园区直流微电网模型,对所提方案进行了仿真验证。结果表明:采取保护配置方案后短路电流明显下降,电流持续时间变长,根据保护装置参考条件所得的参数值满足故障电流检测与保护判断所需时间。
Based on the structure and characteristics of park DC micro-grid system, the fault characteristics of different grounding modes and the requirements for fault detection devices are analyzed in this paper, and the response curve of voltage and current is deduced. Based on the topological structure of power electronic transformer, it is proved that the current has no oscillation problem under the condition of under damping. And then, the short-circuit currents before and after installing protection allocation scheme are compared, and the constraint conditions for selection of protection allocation scheme are given with consideration of such factors as equipment safety and protection coordination in case of faults. Finally, a park DC microgrid model is constructed based on the PSCAD/EMTDC platform, and a simulation is made on the proposed scheme. The simulation results indicate that: the short-circuit current decreases significantly after installing protection allocation scheme, while the current response time increases; and the parameter value obtained according to the reference condition for protection device selection satisfies the time required for fault current detection and protection judgment.
Based on the structure and characteristics of park DC micro-grid system, the fault characteristics of different grounding modes and the requirements for fault detection devices are analyzed in this paper, and the response curve of voltage and current is deduced. Based on the topological structure of power electronic transformer, it is proved that the current has no oscillation problem under the condition of under damping. And then, the short-circuit currents before and after installing protection allocation scheme are compared, and the constraint conditions for selection of protection allocation scheme are given with consideration of such factors as equipment safety and protection coordination in case of faults. Finally, a park DC microgrid model is constructed based on the PSCAD/EMTDC platform, and a simulation is made on the proposed scheme. The simulation results indicate that: the short-circuit current decreases significantly after installing protection allocation scheme, while the current response time increases; and the parameter value obtained according to the reference condition for protection device selection satisfies the time required for fault current detection and protection judgment.
引文
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[19] BARAN M E, El MARKABY I. Fault analysis on distribution feeders with distributed generators[J]. IEEE Transactions on Power Systems, 2005, 20(4):1757-1764.
[20]李思维,李树泉.一种以电能为中心的绿色复合型能源网设计[J].中国电力,2015, 48(11):117-122.LI Siwei, LI Shuquan. A composite green energy network design based on electric energy[J]. Electric Power, 2015, 48(11):117-122.
[21]季亮,张海涛,任建铭,等.基于逆变型DG控制特性的微电网故障特征分析[J].中国电力,2017, 50(12):165-172.JI Liang, ZHANG Haitao, REN Jianming, et al. New microgrid fault analysis method based on inverter-type DG characteristic[J]. Electric Power,2017, 50(12):165-172.
[2]鲁刚.中国能源互联网发展基本特征[J].中国电力,2018, 51(8):17-23.LU Gang. Basic characteristics of China's energy internet development[J]. Electric Power, 2018, 51(8):17-23.
[3] XUE Y S, YU X H. Beyond smart grid-A cybe-physical-socialsystem in energy future[J]. Proceedings of the IEEE, 2017, 105(12):2290-2292.
[4]国网能源研究院有限公司.中国能源电力发展展望[M].北京:中国电力出版社,2017.
[5]王毅,张丽荣,李和明,等.风电直流微网的电压分层协调控制[J].中国电机工程学报,2013, 33(4):16-24.WANG Yi, ZHANG Lirong, LI Heming, et al. Hierarchical coordinated control of wind turbine-based DC microgrid[J].Proceedings of the CSEE, 2013, 33(4):16-24.
[6]王继业,李洋,路兆铭,等.基于能源交换机和路由器的局域能源互联网研究[J].中国电机工程学报,2016, 36(13):3433-3439.WANG Jiye, LI Yang, LU Zhaoming, et al. Research on local-area energy internet control technology based on energy switch and energy routers[J]. Proceedings of the CSEE, 2016, 36(13):3433-3439.
[7] VISWESWARIAH C, GAMMONS C B. Preface:Smarter energy[J].IBM Journal of Research and Development, 2016, 60(1):1-4.
[8]黄文焘,邰能灵,唐跃中.交流微电网系统并网保护分析[J].电力系统自动化,2013, 37(6):114-120.HUANG Wentao, TAI Nengling, TANG Yuezhong. Analysis of interconnection protection in AC microgrid[J]. Automation of Electric Power Systems,2013, 37(6):114-120.
[9] BUI D M, CHEN S L, LIEN K Y, et al. A generalised fault protection structure for unigrounded low-voltage AC microgrids[C]//IEEE Innovative Smart Grid Technologies-Asia.Bangkok:2016.
[10]吴志力,杨卫红,原凯,等.园区能源互联网多能源协同优化配置发展构想[J].中国电力,2018, 51(8):99-105.WU Zhili, YANG Weihong, YUAN Kai, et al. Park energy internet development design of multi-energy synergic optimal allocation[J].Electric Power,2018, 51(8):99-105.
[11] LIANG K, NIAN H. Collaborative control strategy of power electronic transformer and fault current limiter in DC microgrid[J].Journal of Engineering, 2017(13):1788-1792.
[12]李子峰.使用故障分类新方法的直流微电网保护方案[J].高电压技术,2018,44(4):1261-1268.LI Zifeng. Protection scheme for a DC microgrid using a new fault classification method[J]. High Voltage Engineering, 2018, 44(4):1261-1268.
[13]董朝阳,赵俊华,文福拴,等.从智能电网到能源互联网:基本概念与研究框架[J].电力系统自动化,2014, 38(15):1-11.DONG Zhaoyang, ZHAO Junhua, WEN Fushuan, et al. From smart grid to energy internet:Basic concept and research framework[J].Automation of Electric Power Systems, 2014, 38(15):1-11.
[14]彭春华,张艳伟.基于电流正序分量相位比较的主动配电网保护方案[J].电力自动化设备,2016, 36(6):163-169.PENG Chunhua, ZHANG Yanwei. An active distribution network protection scheme based on phase comparison of current positive sequence component[J]. Electric Power Automation Equipment,2016, 36(6):163-169.
[15]罗映红,许义佳,史彤彤,等.具有直流故障阻断能力的混合型模块化多电平换流器[J].中国电力,2018, 51(5):1-9.LUO Yinghong, XU Yijia, SHI Tongtong, et al. Hybrid topology of modular multilevel converter with DC fault blocking capability[J].Electric Power, 2018, 51(5):1-9.
[16] Low-voltage electrical installations-Partl:Fundamental principles,assessment of general characteristics, definitions:IEC 60364-1-2005[S].
[17]倪晨鸿.面向微电网应用的高频隔离DC/DC电路[D].杭州:中国计量学院,2013:33-37.
[18]谢祖荣,车勇,黄之初.基于Matlab的RLC二阶电路零输人响应的研究[J].武汉理工大学学报,2002, 24(1):46-49.XIE Zurong, CHE Yong, HUANG Zhichu. Study on response to zero input of the second order RLC circuit based on Matlab[J]. Journal of Wuhan Uiversity of Technology, 2002, 24(1):46-49.
[19] BARAN M E, El MARKABY I. Fault analysis on distribution feeders with distributed generators[J]. IEEE Transactions on Power Systems, 2005, 20(4):1757-1764.
[20]李思维,李树泉.一种以电能为中心的绿色复合型能源网设计[J].中国电力,2015, 48(11):117-122.LI Siwei, LI Shuquan. A composite green energy network design based on electric energy[J]. Electric Power, 2015, 48(11):117-122.
[21]季亮,张海涛,任建铭,等.基于逆变型DG控制特性的微电网故障特征分析[J].中国电力,2017, 50(12):165-172.JI Liang, ZHANG Haitao, REN Jianming, et al. New microgrid fault analysis method based on inverter-type DG characteristic[J]. Electric Power,2017, 50(12):165-172.