提高光学电流互感器准确度的组合方法

根据光学电流互感器(OCT)的数学模型，得出了OCT的系统特性方框图，论证了OCT具有开环控制特性，本身难以达到测量的高精度，为此文中提出了一种新型的自适应OCT。以稳态电流参考模型和OCT为基础，应用自适应Kalman理论和小波理论，构成了模型参考自适应控制系统，消除了温度、应力等因素对OCT的影响，因而综合提高了暂态和稳态测量准确度。经实验室验证后的自适应OCT已在河北省保定市某变电站挂网试运行，在现场实际环境中进一步对自适应OCT和自适应算法进行了验证，证明了自适应OCT具有优良的性能和自适应控制及算法的正确性。

COMBINED METHOD TO IMPROVE THE ACCURACY OF OPTICAL CURRENT TRANSDUCER

According to the mathematical model of optical current transducer (OCT), the system block diagram of OCT is established. It's proved that OCT with low measuring accuracy is owing to its open loop characteristic by using the microcosmic electromagnetism theory. A new kind of adaptive optical current transducer is presented, in which the adaptive Kalman filter theory and wavelet theory is applied to form the model reference adaptive control system. With the elimination of the disturbance of temperature and stress in the adaptive OCT, the accuracy in the steady state and transient state is improved. At present, the adaptive OCT validated in the lab has been installed in a substation in Baoding City, Hebei Province. Results show that the proposed OCT has good performance, and its control system and algorithm are reasonable.