考虑真空断路器重燃特性的海上风电场分闸过电压研究  

Switching-off overvoltage of offshore wind farm considering reignition characteristics of vacuum circuit breaker

作　　者：郭亚勋 刘刚[1] 江晓锋 陈健宁 辛妍丽 郑明 GUO Yaxun;LIU Gang;JIANG Xiaofeng;CHEN Jianning;XIN Yanli;ZHENG Ming(School of Electric Power,South China University of Technology,Guangzhou 510640,China;Xingtai Power Supply Branch,State Grid Hebei Electric Power Supply Co.,Ltd.,Xingtai 054000,China;Guangdong Electric Power Design Institute Co.,Ltd.of China Energy Engineering Group,Guangzhou 510663,China)

机构地区：[1]华南理工大学电力学院,广东广州510640 [2]国网河北省电力有限公司刑台供电分公司,河北刑台054000 [3]中国能源建设集团广东省电力设计研究院有限公司,广东广州510663

出　　处：《电力自动化设备》2018年第10期60-65,95,共7页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(51477054);国家高技术研究发展计划(863计划)资助项目(2015AA050201)

摘　　要：为了研究真空断路器操作对海上风电场机端变压器高压侧产生的高频暂态过电压特性的影响,搭建了简化的海上风电场中压电缆集电测试系统实验平台,并且依据实验结果建立真空断路器重燃模型、变压器高频模型和金属氧化锌避雷器频率依赖模型。基于自定义的高频模型,利用PSCAD/EMTDC仿真软件搭建海上风电场中压集电系统,研究断路器正常分闸和故障分闸对暂态过电压幅值和陡度以及重燃总次数的影响,并且提出在塔底真空断路器和80 m电缆连接处串联扼流线圈和并联小电容的过电压保护装置。仿真结果表明塔真空断路器故障性分闸产生的过电压、重燃总次数最严重,过电压幅值最大为2.95 p.u.,陡度最大为268.67k V/μs,重燃总次数最多达161次,加装过电压保护装置后暂态过电压幅值和陡度以及重燃总次数得到了明显的抑制。In order to study the influences of the vacuum circuit breakers＇ operation on the characteristics of high frequency transient overvohage in the high-voltage side of generator terminal transformer in the offshore wind farm, a simplified experimental platform for the medium voltage cable electrical collector test system is established. The reig- nition model of vacuum circuit breaker, the high-frequency model of transformer and the frequency dependent model of metal Zinc Oxide arrester are established according to the experimental results. Based on the self-defined high-frequency model, the medium voltage collection system of offshore wind farm is set up using the PSCAD/EMTDC simulation software. The influences of normal switching-off and fault tripping of the circuit breakers on the amplitude and steepness of the transient overvohage and the total number of reignitions are studied. An overvoltage protection device is proposed, which adds a choke coil in series and a small capacitor in parallel at the joint of the tower bottom vacuum circuit breaker and the 80 m cable. Simulative results show that the overvokage and the total number of reignitions caused by the fault tripping of vacuum circuit breakers located at the bottom of a tower are the most serious, and the maximum overvohage amplitude is 2.95 p.u. ,the maximum steepness is 268.67 kV/μs and the total number of reignitions is up to 161. The amplitude and steepness of the transient overvoltage and the total number of reignitions are significantly suppressed with the installation of the overvoltage protection device.

关 键 词：海上风电场 真空断路器 重燃特性 高频暂态过电压 分闸过电压 扼流线圈 模型 

分 类 号：TM614[电气工程—电力系统及自动化] TM86