PWM整流器的无网压传感器DPC研究  

Research on Power Grid Voltage Sensorless DPC of PWM Rectifier

作　　者：卜文绍[1] 翟利利[1] 汪显博[1] 袁澜 

机构地区：[1]河南科技大学电子信息工程学院,河南洛阳471003

出　　处：《电气传动》2013年第2期56-60,共5页Electric Drive

基　　金：国家自然科学基金项目(51277053);河南省国际科技合作项目(114300510029);河南省教育厅自然基金项目(2010B510011)

摘　　要：为了更好地实现三相电压型PWM整流器的无电网电压传感器运行控制,给出了基于虚拟磁链的无电网电压传感器的直接功率控制(DPC)策略,根据PWM整流器的直流侧电压、交流电流和开关状态等得到虚拟磁链矢量,并据此对交流电网电压进行实时估算;采用SVPWM调制代替传统的开关表,采用连续PI调节器代替了传统的滞环调节器,给出了三相PWM整流器的无电网电压传感器DPC控制系统结构,不但可实现开关频率固定,还可获得更好的工作波形。仿真试验结果表明了所给估算方法和控制策略的有效性和可行性。To achieve grid voltage sensorless control of three-phase PWM rectifier with high precision, the power grid voltage sensorless DPC （direct power control）strategy based on virtual estimation was presented in detail. According to the DC voltage, AC current and switching status of PWM rectifier, the estimation of virtual flux of power grid voltage was achieved firstly. And then, the power grid voltage was estimated according to the Virtual flux real- time. SVPWM modulation was adopted to substitute conventional on- off table, and PI adjustor was adopted to substitute the conventional hysteresis-loop adjustor, then the grid voltage sensorless DPC control system of three- phase PWM rectifier was presented, and the grid voltage sensorless operation was achieved by simulation. The simulation results verify the validity and feasibility of the presented estimated method and control strategy.

关 键 词：无电网电压传感器 虚拟磁链 实时估算模型 直接功率控制 

分 类 号：TM341[电气工程—电机]