无标题文档
论文摘要内容

题名:

 20kV配电网中性点灵活接地方式研究

作者:

 赵张磊

语种:

 chi

学科:

 电力系统及其自动化

学位:

 工程硕士

学校:

 南京工程学院

院系:

 电力工程学院

专业:

 电气工程

导师姓名:

 韩笑

完成日期:

 2014-12-20

题目(外文):

 Research of 20kV Distribution Network Neutral Flexible Grounding Mode

关键字(中文):

 20kV 配电网 中性点 灵活接地

关键字(外文):

 20kV Distribution network Neutral point Flexible grounding.

文摘:

 

20kV配电网因其在供电能力、电能质量和经济性方面的优势已在江苏、浙江等地区得到试点应用。其中性点接地方式的选择,直接关系到该类型配电网的连续可靠供电及设备的安全。如单一采用电阻接地方式,其存在瞬时性故障馈线跳闸的问题,而如单一采用消弧线圈接地方式,选线装置无法快速准确识别发生永久性故障的线路。本文结合浙江省临海市东部区块20kV配电网实际,提出一种将电阻接地方式与消弧线圈接地方式灵活切换的技术方案,并对灵活切换的应用范围、切换条件、实施手段进行了具体的说明。

首先,对临海市东部区块20kV配电网的电容电流进行分类统计与预测,对中性点非直接接地系统单相接地时暂态电气量变化特点进行研究,进而对该电网采用灵活接地方式的可行性进行理论分析,并依此提出了一种判别20kV配电网能否采用灵活接地方式的具体方案。其次,提出了一种灵活切换的技术实施方案,该方案通过实时采集分析电网中性点电压、电流,完成瞬时性接地故障与永久性接地故障的识别及相应切换操作。方案还针对电阻投切失败、高阻接地故障等特殊问题,采用基于S变换的故障暂态信息分析方法,向变电站监控系统提供相应判断信息。以上方案中所述的故障判断与选线方法通过软件仿真验证。最后,研制出一种灵活切换控制器样机,并对控制器的工作原理、软硬件设计方案进行说明。

研究结果表明,对部分地区的20kV配电网采用灵活接地方式,既能够有效避免瞬时性单相接地故障导致的馈线跳闸,又能够快速准确地切除发生永久性故障的线路,从而提高配电网的供电可靠性及设备安全性。通过现场测试校验,切换控制器对故障特征与类型识别准确,切换控制可靠。灵活接地方案已在临海20kV配电网中实施,取得了预期的经济效益。

文摘(外文):

 

20kV distribution network has been popularized in Jiangsu, Zhejiang and other regions because of its advantages in the power supply capacity, power quality and economy. The choice of the reasonable neutral point grounding is related to the reliability of the power grid and the security of the equipment. Using the single resistance grounding causes the problem of the feeder tripping when the transient fault occurs. When the distribution uses the arc suppression coil grounding, selection device can’t identify lines that exist the permanent fault. Combined with the 20kV distribution network real operation characteristics of Linhai City, Zhejiang Province, this paper proposes a technical solution of switching flexibly to the arc suppression coil grounding and resistance grounding, and illustrates the scope of application, the switching conditions, the means of implementation.

Firstly, based on the statistics and forecasts of capacitive current in the Linhai City 20kV distribution network and the analysis of transient electrical quantities characteristics in ungrounded neutral system, this paper analyzes the feasibility of flexible grounding and presents a specific program of discriminating 20kV distribution network that adopts the flexible grounding. Secondly, this paper proposes a technical program of flexible switching. This program analyzes the grid neutral voltage and current, completes the identification of transient or permanent grounding fault, finishes the corresponding switching operation. For the grid special conditions of the failure to the resistance switching and high impedance grounding fault, this program uses the analysis of fault transient information based on S transformation and provides the information to the substation monitoring system. For the above fault diagnosis and selection methodology in program is verified by the simulation. Finally, this paper develops a prototype of the flexible switching controller, and describes the working principle of the controller, the design of hardware and software.

The results show that using the proper flexible switching grounding in some 20kV distribution networks not only effectively avoids the feeder tripping because of transient single-phase grounding fault, but also cuts the permanent fault line quickly and accurately. It is beneficial to improve the reliability of power supply and equipment security. Field testing results show that switching controller can correctly identify the type and characteristic of fault, and reliably control the switching accordingly. Flexible grounding scheme has been implemented in Linhai 20kV distribution network, and achieved the expected economic benefits.

参考文献:

[1] 陈衍.电力系统稳态分析[M].北京:中国电力出版社,1995. [2] 贺家李.电力系统继电保护原理[M].北京:中国电力出版社,1994. [3] 李福寿.中性点非有效接地电网的运行[M].北京:水利电力出版社,1993. [4] 程杰,向铁元等.20kV电压等级经济性比较论证[J]. 电力系统及其自动化学报,2011, 23(5):125-130. [5] 杨德伦,李景禄等.20kV电压等级配电设备选型的探讨[J]. 高压电器,2010, 46(12):82-88. [6] 张海.6~35kV电网中性点灵活接地及其控制的研究[D].保定:华北电力大学(河北),2006. [7] 刘沛清,滕欢.20kV电压等级在我国电网发展中的应用及展望[J]. 电工电气,2011, (8):1-4. [8] 汲亚飞,侯义明.20kV配电网中性点不同接地方式的经济性分析[A]. 2008年20kV电压供电专题研讨会论文集[C]. 2008. [9] 陈根永,侯永将等.20kV配电电压等级的接地方式研究[J]. 郑州大学学报(工学版),2010, 31(5):33-37. [10] 殷红旭,张建华. 20kV中压配电在城市高负荷密度新区中的应用[J]. 现代电力,2010, 27(2):35-38. [11] 孙可,董朝武等.20kV配电网的中性点接地方式研究[J]. 能源工程,2010, (6):1-8. [12] 范天明,张祖平.中压配电电压等级优化与改造[M].北京:中国电力出版社,2012. [13] 李甜甜.20kV配电网中性点接地方式与继电保护改造的研究[D].北京:北京交通大学,2010. [14] 施侠,葛春定等.国外20kV配电网研究及其应用实践简述[J]. 华东电力,2012, 40(12):2245-2248. [15] 要焕年,曹梅月.电力系统谐振接地[M].北京:中国电力出版社,2009. [16] 周灵江.台州临海临港新城20kV电压等级应用的研究[D].北京:华北电力大学,2014. [17] 曾祥君,王媛媛,李健等.基于配电网柔性接地控制的故障消弧与馈线保护新原理[J]. 中国电机工程学报,2012, 32(16):137-143. [18] 张小卫,朱东柏,刘骥.基于IGBT新型消弧接地补偿装置仿真的研究[J]. 哈尔滨理工大学学报,2006, 11(1):131-134+138. [19] 要焕年,曹梅月.城市中压电网运行特性的优化[J]. 中国电力,1998, 31(3):23-25. [20] 方励云.乐清地区20kV配电网络规划项目实用性研究[D].保定:华北电力大学,2012. [21] 马星河,李传超,张根现等.改进的煤矿高压电网单相接地电容电流计算方法[J]. 电测与仪表,2012, 47(7):9-12. [22] 周远芳.110/20kV变电站设计中相关技术问题研究[D].浙江:浙江大学,2011. [23] 傅知兰.电力系统电气设备选择与实用计算[M].北京:中国电力出版社,2004. [24] 张勇军,李启峰等.220/20kV电压序列的技术经济性分析[J]. 电网技术,2011, 35(8):156-160. [25] 马勇,魏旭,周志成等.配电网灵活接地方式运行特性的仿真研究[J]. 江苏电机工程,2011, 30(4):26-29. [26] 朱维明,徐建强,仇群辉等.关于20kV配电网灵活接地方式若干问题的探讨[J]. 浙江电力,2012, (7):6-8. [27] 梁振升.变电站20kV接线方式的最优选择[J]. 电力建设,2012, 33(1):54-56. [28] 翁湘烨,任许麟.无锡太湖新城20kV电压等级应用研究[J]. 华东电力,2010, 38(2):261-263. [29] 中华人民共和国电力行业标准.《交流电气装置的过电压保护和绝缘配合》DL/T620-1997 [S]. 电力工业部,1997. [30] 中华人民共和国电力行业标准.《交流电气装置的接地》DL/T621-1997 [S]. 电力工业部,1997. [31] H.Roman, H.Pietzseh(德国).中压系统中的接地故障处理,王海群译.4.36.CIRED.1995. [32] Freschi, Fabio. An effective semi analytical method for simulating grounding grids. IEEE Transactions on Industry Applications,Vol.7,No.1,PP.256-263,Mar.2013 [33] 江苏省电机工程协会.20kV电压等级配电技术论文集[C].北京:中国电力出社,2008. [34] Mitolo. M. On Outdoor lighting installations grounding Systems. IEEE Transactions on Industry Applications,Vol.7,No.1,PP.224-228,Oct.2014 [35] 杨子亮.20kV配电网中性点接地方式选择以及继电保护整定的研究[D].河北:河北工业大学,2011. [36] Prakash. K. Ray, Nand. Kishor, Soumya. R. Mohanty. Islanding and power quality disturbance detection in grid-connected hybrid power system using wavelet and s-transform IEEE Transactions on Smart Grid,Vol.3,No.3,PP.1082-1095,SeP.2012. [37] 王清亮.补偿接地电网的暂态量选线保护研究[D].西安:西安科技大学,2010. [38] H. S. Behera, P. K. Dash. Power quality time series data mining using s-transform and fuzzy expert system. Appl. Soft Computer,Vol.10,No 3,PP.945-955,Feb.2010. [39] 康娣,蔡显岗等.某大型水电站20kV系统一点接地后铁磁谐振现象分析[J]. 四川电力技术,2014, 37(6):78-80. [40] 郑新龙,李世强.海岛地区实施20kV配电网的思考[J]. 浙江电力,2011, (4):57-60. [41] 许俊丽.20kV配电网自适应继电保护的研究[D].河北:河北工业大学,2012. [42] Shinji Shinnaka. A novel fast-tracking d-estimation method for single-phase singnals. IEEE Transactions on Power Electronics,Vol.26,No.4,PP.1081-1088,April 2011. [43] P. K. Ray, S. R. Mohanty N. Kishor. Disturbance detection in grid connected distributed generation system using wavelet and s-transform. Elect. Power Syst. Res,Vol.152,No. 5, PP.805-819,SeP.2011. [44] A Lelong, L. Sommervogel N. Ravot. Distributed reflectometry method for wire fault location using selective average. IEEE Sensors Journal,Vol.10,No. 2,PP.300-310,Feb.2010. [45] J. Sadeh and A. Adinehzadeh. Accurate fault location algorithm for transmission line in the presence of series connected FACTS devices. Elect. Power Energy Syst,Vol. 32,No. 4,PP.323–328,May 2010. [46] 舒东胜等.城市电网中压配网升压为20kV的探讨[J]. 湖北电力,2010, 34(1):4-5. [47] 周灵江,孟庆楠等. 临海20kV灵活接地方式仿真研究[J].科技资讯,2013,24(4):114. [48] K. Jia, D. W. P. Thomas, M. Summer. A new double-ended fault-location scheme for utilization in integrated power systems. IEEE Transactions on Power Delivery,Vol.28,No.2,Apr.2013. [49] Pourahmadi-Nakhli M, Safavi AA. Path characteristic frequency-based fault locating in radial distribution systems using wavelets and neural networks. IEEE Trans Power,Vol.26,No.2,PP.772-781,2011. [50] 束洪春,彭仕欣.利用测后模拟的谐振接地系统故障选线方法[J]. 中国电机工程学报,2008,28(16): 59-64.

﹀展开
开放日期:

 2018-07-01

无标题文档