摘要
巴西美丽山II期直流工程在工作频率、换流器拓扑、环境温度等方面与国内直流工程存在较大差异,若直接套用国内工程用饱和电抗器存在铁心损耗大、温升过高等问题。此外,饱和电抗器运行时温度较高一直是影响换流阀可靠性的潜在隐患。因此,亟需开展饱和电抗器的损耗优化研究,保证工程长期运行的可靠性。以巴西直流工程为切入点,开展了饱和电抗器铁心损耗研究,给出了一种通过调整铁心气隙减小铁心损耗的优化方法,分析了损耗降低机理,研制了饱和电抗器样机,结合仿真和试验分析手段,研究了调整电感值后饱和电抗器电气特性,验证了该方法的有效性。该优化方法不会影响饱和电抗器的外部结构和阀塔的整体结构设计,因此具有工程兼容性高、成本低的优点。同时,提供的优化思路不仅适用于巴西直流工程,也为不同直流工程用饱和电抗器的可行性分析提供理论指导,支持特高压直流工程换流阀前期设计以及技术改造。
The Belo Mountain UHVDC phase II transmission project in Brazil is quite different from the similar domestic projects in terms of working frequency, converter topology and ambient temperature. If applying mechanically the domestic saturable reactors, there will exist problems such as high core loss and high temperature rise. In addition, the high temperature of the saturable reactors in operation is always a potential hazard affecting the reliability of the converter valves. Therefore, it is urgent to optimize the loss of the saturable reactor to ensure the reliability of the long-term operation of the project.Based on the Belo Mountain DC project, the study on the core loss of the saturated reactors is carried out. An optimization method to reduce core losses by adjusting the core air gap is given firstly. Then the mechanism of loss reduction is analyzed, and a prototype of a saturable reactor is developed. The electrical characteristics of the saturable reactor after adjusting the inductance value are further studied in combination with simulation and experimental analysis, and the validity of the method is verified. This optimization method does not affect the external structure of the saturable reactor and the overall structural design of the valve tower, thus has the advantages of a high degree of engineering compatibility and low cost. At the same time, the optimization method proposed in this paper is applicable in the Belo Mountain DC project, instructive theoretically in the feasibility of the saturable reactors to be used in different DC projects, and supportive to the pre-design and technical transformation of the UHVDC engineering converter valves.
作者
张娟娟
盛财旺
巩少岩
周建辉
高冲
纪锋
ZHANG Juanjuan;SHENG Caiwang;GONG Shaoyan;ZHOU Jianhui;GAO Chong;JI Feng(State Key Laboratory of Advanced Power Transmission Technology(Global Energy Interconnection Research Institute Co.,Ltd.),Changping District,Beijing 102209,China;Beijing Key Laboratory of High Power Electronics(Global Energy Interconnection Research Institute Co.,Ltd.),Changping District,Beijing 102200,China)
出处
《电网技术》
EI
CSCD
北大核心
2020年第8期3179-3185,共7页
Power System Technology
基金
国家重点研发计划项目(2017YFB0903800)
国家电网公司科技项目(5455DW170026)。
关键词
饱和电抗器
巴西直流工程
铁心损耗
保护特性
放电试验
非周期触发
saturable reactor
Brazil UHVDC project
core loss
protection characteristics
discharge test
non-repetitive trigger
作者简介
通信作者:张娟娟(1989),女,硕士,工程师,主要从事特高压直流换流阀装备电气设计与试验技术等研究工作,E-mail:juanzhang_olivia@163.com;盛财旺(1986),男,博士,高级工程师,主要从事特高压直流换流阀电气设计及电磁暂态分析方面的研究工作,E-mail:shengcaiwang2005@163.com。
