互补非零矢量单传感器相电流重构策略  

Complementary Non-Zero Vector Current Reconstruction Strategy with Single Sensor

作　　者：申永鹏 武克轩 吴成中[2] 梁伟华 张细政[3] Shen Yongpeng;Wu Kexuan;Wu Chengzhong;Liang Weihua;Zhang Xizheng(School of Electrical and Information Engineering Zhengzhou University of light industry,Zhengzhou 450002 China;RVC-National Engineering Lab Hunan University,Changsha 410082 China;College of Electrical and Information Engineering Hunan Institute of Engineering,Xiangtan 411104 China)

机构地区：[1]郑州轻工业大学电气信息工程学院,郑州450002 [2]湖南大学机器人视觉感知与控制技术国家工程研究中心,长沙410082 [3]湖南工程学院电气与信息工程学院,湘潭411104

出　　处：《电工技术学报》2023年第8期2126-2135,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金面上项目(62273313,62173134);河南省科技攻关项目(222102240005);河南省青年骨干教师培养计划项目(2021GGJS089);郑州市协同创新专项项目(2021ZDPY0204);河南省自然科学基金项目(222300420373)资助。

摘　　要：针对传统单传感器直流母线采样系统中相电流重构盲区问题,该文分析传统空间矢量脉冲宽度调制(SVPWM)技术的电流采样方法和重构盲区产生的原因,精确地划分电压空间矢量平面的各个区域。提出一种互补非零矢量脉宽调制(CNSVPWM)方法,通过在中调制区添加互补非零矢量来延长电流采样窗口的时间,满足直流母线电流最小采样时间要求,消除了电流重构盲区,拓展了电机的运行范围。仿真及实验结果表明,采用CNSVPWM方法电流总谐波畸变率(THD)低于6.15%,重构误差低于3%,电机在动态工况下运行正常。With the development of power electronics and control theory,AC drive systems are widely used in industrial production,transportation,military aerospace,and other fields.In the AC servo control system,the motor phase current is the core parameter to the vector control,and the detection and feedback of the phase current are of great significance in improving the control system’s performance.The traditional vector control system needs at least two current sensors installed on the AC output side through the space voltage pulse width modulation(SVPWM)method to achieve phase current acquisition and real-time feedback.Multiple sensors will inevitably increase the system cost and equipment volume,which is not conducive to the development of control equipment miniaturization.Furthermore,the inconsistencies between multiple sensors will deteriorate the performance of the system.To improve these problems,based on the DC bus single sensor sampling principle and traditional SVPWM method,this paper proposes a complementary non-zero vector pulse width modulation(CNSVPWM)method.CNSVPWM utilizes the DC bus single sensor to carry out the phase current time-sharing acquisition under the action of the complementary non-zero vectors and complete the reconstruction of three-phase currents.Thus,accurate feedback on current information is achieved while reducing the cost and volume of the control system.Firstly,according to the switching states of the three-phase two-level inverter,six effective voltage vectors and two zero vectors are defined,and the corresponding relationship between the DC bus current idc and the phase current can be obtained.Then,the characteristics of the switching devices and the establishment process of the DC bus current are analyzed.The shortest time for the DC bus current to reach a steady state is obtained.That is,the minimum sampling time Tmin for current sampling.According to the minimum sampling time,each sector is divided into the observable area,sector boundary,and low modulation area.The effective vo

关 键 词：直流母线采样 单传感器 空间矢量脉冲宽度调制(SVPWM) 相电流重构 

分 类 号：TM341[电气工程—电机]