南方电网技术2025，Vol.19Issue(7)：112-118,7.DOI:10.13648/j.cnki.issn1674-0629.2025.07.009
直流电压互感器模拟信号高线性度光纤传输系统
High Linearity Fiber Optic Transmission System for Analog Signals of DC Voltage Transformers
摘要
Abstract
The low-voltage output analog signals of direct circuit voltage transformers(DCVTs)are transmitted through cables without electrical isolation and are susceptible to electromagnetic interference.A scheme for transmitting analog signals with high linearity using optical fibers is designed.Using dual light sources and photodetectors to form a transmission channel and a closed-loop negative feedback channel,the photodetector in the negative feedback channel converts the current and feeds it back to the input end to suppress the nonlinearity of the electro-optical transmission coefficient.The nonlinear suppression control strategy and effect are analyzed through a control system model,and the key elements of the circuit design of the analog signal fiber optic transmission system are analyzed.A comparative test is conducted on the nonlinear characteristics of open-loop transmission and closed-loop feedback transmission of analog signal fiber optic transmission systems.The results show that the nonlinear error of analog signal fiber optic transmission is reduced from a few percent to within±0.05%through the closed-loop negative feedback transmission scheme.Finally,the analog signal fiber optic transmission system is applied to DCVT for linearity testing.The experimental results show that the analog signal fiber optic transmission system can be well applied to the application requirements of electrical isolation and elimination of electromagnetic interference of analog signals in DC distribution networks.关键词
高线性度/模拟信号光纤传输/直流电压互感器/闭环负反馈Key words
high linearity/analog signal fiber optic transmission/direct circuit voltage transformer(DCVT)/closed loop negative feedback分类
信息技术与安全科学引用本文复制引用
宋宏天,胡珊珊,王保帅,王宗义,肖霞..直流电压互感器模拟信号高线性度光纤传输系统[J].南方电网技术,2025,19(7):112-118,7.基金项目
广东省科技计划项目(2021B1212050014) （2021B1212050014）
中国南方电网有限责任公司科技项目(KYKJXM20222007).Supported by the Science and Technology Plan Project of Guangdong Province(2021B1212050014) （KYKJXM20222007）
the Science and Technology Project of China Southern Power Grid Co.,Ltd.(KYKJXM20222007). （KYKJXM20222007）
