摘要
有载分接开关是特高压直流输电工程中换流变压器的重要部件,其结构复杂且有严格的切换动作时序要求,电气时序不合理极易产生电弧烧蚀失效等问题,进而影响输电工程的安全运行。针对有载分接开关动力学模型构建缺乏通用性与电气时序特性影响规律不明晰问题,基于能量法提出了有载分接开关通用切换动力学模型构建方法,研究了切换过程中能量转换关系与各部分能量损耗计算方法;以一类有载分接开关为例,将其通用动力学模型与软件仿真结果对比表明,两者角速度曲线相吻合,电气切换时序相对误差均小于2.01%,验证了通用模型构建方法的正确性;其次,通过与实验进行对比,发现两者角位移与角速度曲线趋势一致;此外,研究了有载分接开关系统关键参数对电气切换特性影响规律,整体切换时间随着驱动力矩增大而减小,随着转动惯量增大而增大,呈指数关系,且受主触头机构(main contact,MC)切换位置影响较显著;关键电气时序受驱动力矩、转动惯量影响较大,且真空触头机构V1、V2切换时间与V1、V2切换位置呈线性关系,V1-过渡触头机构Z1间隔时间与V2-过渡触头机构Z2间隔时间同时受V1、Z1与V2、Z2切换位置调控。
The on-load tap changer is an important part of the converter transformer in ultra-high voltage direct current transmission engineering,which has a complex structure and strict switching time sequence requirements.An unreasonable electrical time sequence would quickly lead to electrical problems such as arc ablation failure and so on,thereby affecting the safe operation of the transmission engineering.Aiming the problems on dynamic model construction and unclear influence law of electrical timing characteristics for the on-load tap changer,a general switching dynamic model is built based on an energy method,and a calculation method is proposed for energy transmission and collision energy dissipation.Both a multi-body dynamic simulation model and a general dynamic model are established and compared for an on-load tap changer,and the simulation results show that the angular velocity of the two models are consistent,and the relative errors of electrical switching timing are both less than 2.01%,which verifies the correctness of the equivalent model construction method.Furthermore,the comparison with the experiment shows that the angular displacement and angular velocity curves of the two are consistent.In addition,the influence law of key parameters on the mechanical and electrical switching characteristics for the on-load tap changer is studied.The overall switching time decreases with the increase of driving torque and increases with the increase of rotational inertia exponentially,and is significantly affected by the switching position of the main contact(MC).The key electrical sequence is influenced by a large driving torque and moment of inertia,and the switching time of vacuum contacts-V1 and V2 is linearly related to the switching positions of V1 and V2.The switching positions of V1,transition contact Z1,V2,and transition contact Z2 simultaneously control the interval time between V1-Z1 and V2-Z2.
作者
王一辰
李金忠
杨帆
李戈琦
李刚
方斌
张进华
洪军
WANG Yichen;LI Jinzhong;YANG Fan;LI Geqi;LI Gang;FANG Bin;ZHANG Jinhua;HONG Jun(School of Mechanical Engineering,Xi’an Jiaotong University,Xi’an 710049,Shaanxi Province,China;State Grid Corporation of China,Xicheng District,Beijing 100031,China;China Electric Power Research Institute,Haidian District,Beijing 100192,China)
出处
《电网技术》
EI
CSCD
北大核心
2024年第11期4568-4577,I0041-I0043,I0040,共14页
Power System Technology
基金
国家重点研发计划项目(2021YFB2402100)。
关键词
有载分接开关
动力学模型
电气时序特性
能量转化
on-load tap changer
dynamic model
electrical timing characteristics
energy transformation
