直流OCT与FOCT的误差特性分析和比较

摘要

为了解决OCT和FOCT的误差特性,介绍OCT和FOCT的基本原理与典型结构.针对舟山五端柔性直流输电系统中的OCT和FOCT,提出适用的现场校准试验方法,并建立相应的现场校准试验平台,完成了舟衢站OCT、舟泗站和舟洋站FOCT的现场校准试验.同时根据现场校准结果,分析比较了OCT和FOCT的误差特性:OCT的长期稳定性和线性度优于FOCT;OCT的基本误差曲线是单调变化的,而FOCT的基本误差曲线呈S形,二者的误差变化均随电流增大逐渐减小;OCT几乎没有零点漂移,而FOCT有较大零点漂移.文中的研究结果对OCT和FOCT的运行与维护均具有一定的参考价值.%To understand the error characteristics of OCT and FOCT,the basic principles and typical structures of OCT and FOCT are introduced. For the OCT and FOCT in five-terminal flexible DC power transmission system in Zhoushan,a test method suitable for field calibration is proposed. The corresponding field calibration test platform was established and the field calibration tests of OCT in Zhouqu station as well as FOCT in Zhousi station and Zhouyang station were completed. According to the field calibration results,the error characteristics of OCT and FOCT are analyzed and compared:the long-term stability and the linearity of OCT are better than that of FOCT;the basic error curve of OCT changes monotonically while the basic error curve of FOCT is S-shaped,and the error variation of both decreases with the increase of current;OCT has almost no zero drift, but FOCT has a large zero drift. The research results in this paper have a certain reference value to the operation and mainte-nance of OCT and FOCT.