PCB罗氏线圈电流传感器积分误差的数字补偿策略  

Digital Compensation Strategy for Integral Error of PCB Rogowski Coil Current Sensor

作　　者：姚宇 周泽 石亚飞 辛振 YAO Yu;ZHOU Ze;SHI Yafei;XIN Zhen(State Key Laboratory of Reliability and Intelligence of Electrical Equipment,Hebei University of Technology,Tianjin 300401,China;CPSS)

机构地区：[1]省部共建电工装备可靠性与智能化国家重点实验室(河北工业大学),天津300401 [2]中国电源学会

出　　处：《电源学报》2024年第3期264-271,共8页Journal of Power Supply

基　　金：国家自然科学基金资助项目(52377179)。

摘　　要：准确可靠的开关电流信息是电力电子变换器实现闭环控制、谐波抑制和短路保护的关键要素,有利于进一步提升功率器件的可靠性。PCB罗氏线圈电流传感器因其高带宽、小体积、低成本和低侵扰的特点,具有重要的研究价值和应用前景。然而,传统积分处理电路存在漂移误差与下垂误差,严重限制了PCB罗氏线圈电流传感器的测量精度。首先,本文采用复位型积分电路以避免漂移误差的持续累积,并消除下垂误差带来的影响。同时,针对复位型积分电路存在的漂移误差与偏置误差提出一种数字补偿策略,该方案采用数字信号处理器控制数模转化模块产生模拟补偿信号,并通过高速减法器消除误差,具有补偿精度高、调整方式简单的优点,可以大幅减小积分误差造成的影响;最后,基于双脉冲测试平台分别进行双脉冲、多脉冲和短路保护实验,验证了所提PCB罗氏线圈电流传感器的性能。The accurate and reliable switching current information is important for power electronic converters to realize closed-loop control,harmonic suppression and short-circuit protection,which is conducive to further improving the reliability of power devices.The PCB Rogowski coil current sensor has an important research value and application prospect owing to its advantages of high bandwidth,small size,low cost and low intrusion.However,its measurement accuracy is seriously limited by the drift error and droop error in the traditional integral processing circuit.A resettable integrator is used to avoid the continuous accumulation of drift error while eliminating the influence of droop error.At the same time,a digital compensation strategy for the drift error and offset error in the resettable integrator is proposed,which uses a digital signal processor to control the digital-to-analog conversion module to generate an analog compensation signal and eliminates errors by means of a high-speed subtractor.As a result,this method has advantages of a high compensation accuracy and simple adjustment,and it can greatly reduce the influence due to integral errors.Finally,double-pulse,multiple-pulse and short-circuit protection experiments were carried out based on a double-pulse test platform,and the performance of the proposed PCB Rogowski coil current sensor was verified.

关 键 词：PCB罗氏线圈电流传感器 误差补偿 短路保护 可靠性 

分 类 号：TM93[电气工程—电力电子与电力传动]