This paper describes a multi-threat real-time separating system for broadband anti-radiation missile seeker. It presents a method, with a dual-port memory as comparer, to perform PF and PW hardware real-time separatio...This paper describes a multi-threat real-time separating system for broadband anti-radiation missile seeker. It presents a method, with a dual-port memory as comparer, to perform PF and PW hardware real-time separation and to determine the time-of-arrival (TOA) by use of sequential difference histogram (SDIF). The method has been applied to practice, which has achieved good results.展开更多
针对永磁同步电机下桥臂电流采样拓扑的无位置传感器控制系统,在低载波运行时受数字延时影响易导致位置估计精度低、电流纹波增大、稳定性差等问题,提出一种半周期计算、单采样双更新的空间矢量脉宽调制方法,有效减少系统数字延时。该...针对永磁同步电机下桥臂电流采样拓扑的无位置传感器控制系统,在低载波运行时受数字延时影响易导致位置估计精度低、电流纹波增大、稳定性差等问题,提出一种半周期计算、单采样双更新的空间矢量脉宽调制方法,有效减少系统数字延时。该方法在每个脉冲宽度调制(Pulse-Width Modulation,PWM)的载波过零处采样一次电流,并在采样结束后的半周期内完成目标电压矢量计算。考虑数字延时中电机转过的角度,将目标电压矢量在下一个PWM周期的前、后半周期输出,并分别补偿0.75 T s和1.25 T s等效延时(T s为PWM周期时间),以减小目标电压矢量与实际输出电压矢量之间的误差。将新方法应用于采用模型参考自适应速度观测器的永磁同步电机无位置传感器控制系统中,实验结果表明该方法位置估计精度高、电流纹波小,且可以稳定运行于额定负载、载波比为4.0的工况。展开更多
Matrix converter fed motor drive is superior to pulse width modulation inverter drives since it not only provides bi-directional power flow,sinusoidal input/output currents,unity input power factor,but also allows a c...Matrix converter fed motor drive is superior to pulse width modulation inverter drives since it not only provides bi-directional power flow,sinusoidal input/output currents,unity input power factor,but also allows a compact design due to the lack of DC-link capacitors for energy storage.In this paper,model and control of matrix converter fed induction motor drive system are analyzed.A combined control strategy is simplified and improved,which realizes space vector pulse width modulation of matrix converter and rotor flux oriented vector control technique for induction motor drive simultaneously.This control strategy combines the advantages of matrix converter with the good drive performance of vector control technique.Experimental results demonstrate the feasibility and effectiveness of the proposed control strategy.展开更多
文摘This paper describes a multi-threat real-time separating system for broadband anti-radiation missile seeker. It presents a method, with a dual-port memory as comparer, to perform PF and PW hardware real-time separation and to determine the time-of-arrival (TOA) by use of sequential difference histogram (SDIF). The method has been applied to practice, which has achieved good results.
文摘针对永磁同步电机下桥臂电流采样拓扑的无位置传感器控制系统,在低载波运行时受数字延时影响易导致位置估计精度低、电流纹波增大、稳定性差等问题,提出一种半周期计算、单采样双更新的空间矢量脉宽调制方法,有效减少系统数字延时。该方法在每个脉冲宽度调制(Pulse-Width Modulation,PWM)的载波过零处采样一次电流,并在采样结束后的半周期内完成目标电压矢量计算。考虑数字延时中电机转过的角度,将目标电压矢量在下一个PWM周期的前、后半周期输出,并分别补偿0.75 T s和1.25 T s等效延时(T s为PWM周期时间),以减小目标电压矢量与实际输出电压矢量之间的误差。将新方法应用于采用模型参考自适应速度观测器的永磁同步电机无位置传感器控制系统中,实验结果表明该方法位置估计精度高、电流纹波小,且可以稳定运行于额定负载、载波比为4.0的工况。
文摘Matrix converter fed motor drive is superior to pulse width modulation inverter drives since it not only provides bi-directional power flow,sinusoidal input/output currents,unity input power factor,but also allows a compact design due to the lack of DC-link capacitors for energy storage.In this paper,model and control of matrix converter fed induction motor drive system are analyzed.A combined control strategy is simplified and improved,which realizes space vector pulse width modulation of matrix converter and rotor flux oriented vector control technique for induction motor drive simultaneously.This control strategy combines the advantages of matrix converter with the good drive performance of vector control technique.Experimental results demonstrate the feasibility and effectiveness of the proposed control strategy.
