摘要
有载分接开关(OLTC)切换电弧会影响触头寿命,需要对其工况进行检测。综合dq坐标变换、基波分量提取以及小波算法,本文提出基于功率守恒理论的OLTC燃弧损耗在线检测方法。在理清研究思路的基础上,建立了自耦调压变压器的等效原理图及等效电路,并依据功率守恒理论,推导了切换过程功率方程。利用基波分量提取算法计算了变压器激磁参数,联合Mayr电弧模型建立了OLTC仿真电路。利用dq坐标变换算法得到系统各部分有功功率,计算了9种工况下开关燃弧损耗数据。搭建了基于交流接触器的OLTC样机并利用dSPACE平台完成3种负载工况的燃弧能量在线计算。在考虑测量与计算误差下,仿真与实测结果表明,燃弧能量计算误差与燃弧过程剧烈程度呈负相关性。不同工况之间,仿真计算结果与实测计算结果均具备可辨识性,且数值随工况变化而改变,可作为设备切换工况的判据。该特性对其他开关结构具有适用性,验证了该研究是有效的。本工作以期为开发OLTC在线触头检测系统提供理论基础。
The divertering arc of the on-load tap changer(OLTC)will affect the life of the contact,so it is necessary to test its working condition.Based on dq coordinate transformation,fundamental wave component extraction and wavelet algorithm,an OLTC arc loss detection method based on power conservation theory is proposed in this paper.On the basis of clarifying the research idea,the equivalent schematic diagram and equivalent circuit of the autotransformer are established,and the power equation of the divertering process is deduced according to the power conservation theory.The transformer excitation parameters are calculated by the fundamental wave component extraction algorithm,and the OLTC simulation circuit is established by combining the Mayr arc model.Dq coordinate transformation algorithm was used to obtain the active power of each part of the circuit,and data of arc loss under nine working conditions were obtained.The OLTC prototype based on the ac contactor was built and the online measured calculation of arc energy under three load conditions was completed by using dSPACE platform.Considering the measurement and calculation errors,the simulation and measured results show that the calculation error of arc energy is negatively correlated with the intensity of arc burning process.Both the simulation results and the measured results are distinguishable,and the value changes with the change of working conditions,which can be used as a criterion for equipment switching working conditions.This characteristic is applicable to other switch structures,which proves that the study is effective.This work is expected to provide a theoretical basis for the development of OLTC online contact detection system.
作者
宋冬冬
张丽红
马玉泉
刘西印
吕雪姣
SONG Dong-dong;ZHANG Li-hong;MA Yu-quan;LIU Xi-yin;LV Xue-jiao(College of Information and Electrical Engineering, China Agricultural University, Beijing 100083, China;College of Mechanical Electrical and Engineering, Heibei Normal University of Science & Technology, Qinhuangdao 066004, China)
出处
《电工电能新技术》
CSCD
北大核心
2020年第9期56-64,共9页
Advanced Technology of Electrical Engineering and Energy
基金
河北省高等学校科学技术研究青年基金项目(QN2018211)。
