基于四电平编码与弱光通信的极低功耗传光式电流互感器  

An ultra-low power optical current transformer based on four-level coding and weak-light communication

作　　者：徐文浩 徐启峰[1] 谢楠[1] XU Wenhao;XU Qifeng;XIE Nan(School of Electrical Engineering and Automation,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]福州大学电气工程与自动化学院,福建福州350108

出　　处：《电力系统保护与控制》2024年第5期148-157,共10页Power System Protection and Control

基　　金：国家自然科学基金项目资助(51807030,51977038);福建省科技厅引导性项目资助(2017H0013)。

摘　　要：针对传光式电流互感器高压侧现有的母线取能和激光供能方式存在供电死区、能量转换效率低、使用寿命不足等问题,提出一种基于四电平编码与弱光通信的极低功耗光电传输系统方案。首先,设计三态门电路将信号采集模块的采样时钟和数据信号叠加为一个四电平信号。然后,利用超高亮度且极低功耗的LED将四电平信号转换为光信号并通过光纤传输至低压侧。最后,在低压侧通过高灵敏度雪崩光电二极管探测器进行弱光检测后输入解码电路实现信号解码。将极低功耗光电传输系统应用于传光式电流互感器中进行实验验证,测量结果满足0.2级精度要求,系统高压侧的平均功耗可降低至3.91 mW,保证测量精度的同时大幅降低了功耗。由于高压侧的功耗极低,故可采用大容量电池或小功率光伏系统等可靠供能方案,从而解决了高压侧的供能问题,提高了系统的稳定性和可靠性。The existing busbar energy extraction and laser energy supply methods on the high-voltage side of a light-transmitting current transformer suffer from the problems of power supply dead zones,low energy conversion efficiency,and insufficient service life.Thus an ultra-low power optoelectronic transmission system scheme based on four-level coding and weak light communication is proposed.First,a three-state gate circuit is designed to encode the sampling clock and data signal of the signal sampling module into a four-level signal.Then,the four-level signal is converted into an optical signal and transmitted to the low-voltage side through an optical fiber using an ultra-high brightness and ultra-low power LED.Finally,the signal is decoded at the low voltage side using a high-sensitivity avalanche photodiode detector for weak light detection and then input to the decoding circuit.The ultra-low power system is applied to the light-transmitting current transformer for experimental verification.The results show that it can meet the requirements of 0.2-level accuracy,and the average power consumption of the high-voltage side can be reduced to 3.91 mW.Because of the ultra-low power consumption of the system,the high-voltage side can adopt a reliable energy supply scheme such as a large-capacity battery or low-power photovoltaic system.This solves the problem of power supply and improves stability and reliability.

关 键 词：传光式电流互感器 极低功耗 三态门四电平编码 弱光通信 信号解码 

分 类 号：TM452[电气工程—电器]