Analysis of Influence of Digitization Process on the Error Characteristics of FOCT

Abstract

All-fiber optical current transformers have a large dynamic range and fast response speed, which can meet the test requirements of complex electrical signals for a high proportion of new energy grid-connected operations. At present, the main problems are that the key components are easily affected by the complex environment of the substation, and the error stability is poor. In this paper, by analyzing the structure of all-fiber optical current transformers, the signal transmission process and closed-loop system model are established. Based on the method of numerical simulation, the influence of the digital conversion process and digital transmission process on the measurement accuracy of FOCT is analyzed, and the corresponding improvement strategy is proposed to improve the stability of the measurement error of all-fiber optical current transformers.