直流母线单电流传感器零点漂移误差自校正策略  

Self-correction strategy of zero-point drift error of DC bus single current sensor

作　　者：申永鹏 王前程 王延峰 梁伟华 孟步敏 SHEN Yongpeng;WANG Qiancheng;WANG Yanfeng;LIANG Weihua;MENG Bumin(College of Electrical and Information Engineering,Zhengzhou University of Light Industry,Zhengzhou 450000,China;School of Information Engineering,Xiangtan University,Xiangtan 411100,China)

机构地区：[1]郑州轻工业大学电气信息工程学院,河南郑州450000 [2]湘潭大学信息工程学院,湖南湘潭411100

出　　处：《电机与控制学报》2023年第7期133-142,共10页Electric Machines and Control

基　　金：国家自然科学基金(52177068,61803345,51807013);河南省科技攻关项目(202102210303)。

摘　　要：为了研究三相两电平逆变器中直流母线单电流传感器零点漂移对相电流重构精确度的影响,阐明了直流母线单电流传感器相电流重构原理,对比了多电流传感器与单电流传感器零点漂移误差,揭示了零点漂移误差产生的原因及扩大效应的产生机理,基于插入互补有效电压矢量代替零矢量的空间矢量脉冲宽度调制方法,提出了零点漂移误差自校正策略。分析了各扇区电流观测窗口时长,利用互补有效电压矢量动态电流双采样,实现了相电流重构与电流零点漂移量的自检测和自校正。搭建了基于TMS320F28035型DSP为电驱动控制器的实验平台,在额定转速以内的工况下,自校正后的重构相电流误差小于3.56%,表明了所提误差自校正策略能为控制系统提供可靠的重构电流。In order to study the influence of the zero drift of the DC bus single current sensor on the phase current reconstruction accuracy in the three-phase two-level inverter,the principle of the phase current reconstruction of the DC bus single current sensor was clarified,and the multi-current sensor and the sin-gle current sensor were compared.The zero drift error reveals the cause of the zero drift error and the mechanism of the amplification effect.Based on the space vector pulse width modulation method of inser-ting complementary effective voltage vectors instead of zero vectors,a self-correction strategy for zero drift errors was proposed.The current observation window duration of each sector was analyzed,and the phase current reconstruction and the self-detection and self-correction of the current zero-point drift were real-ized by using the complementary effective voltage vector dynamic current double sampling.A control sys-tem experiment platform with TMS320F28035 DSP as the electric drive controller was built.Under the working conditions within the rated speed,the error of the reconstructed phase current after self-calibra-tion is less than 3.56%,which shows that the proposed error self-calibration strategy can provide reliable reconstructed current for the control system.

关 键 词：三相两电平逆变器 直流母线 单电流传感器 互补矢量 相电流重构 误差自校正 

分 类 号：TM341[电气工程—电机]