针对双PWM变频器整流侧与逆变侧独立控制时,直流侧必须利用大电容稳压,导致系统成本增加且寿命缩短的问题,提出一种整流侧采用引入新型开关矢量表的直接功率控制(Direct Power Control,DPC)方案。该方案逆变侧采用转子磁场定向矢量控制...针对双PWM变频器整流侧与逆变侧独立控制时,直流侧必须利用大电容稳压,导致系统成本增加且寿命缩短的问题,提出一种整流侧采用引入新型开关矢量表的直接功率控制(Direct Power Control,DPC)方案。该方案逆变侧采用转子磁场定向矢量控制,并采用负载功率前馈控制策略,以实现双PWM变频器的协调控制。仿真实验结果表明,相比独立控制的双PWM变频调速系统,采用该一体化协调控制策略的双PWM变频调速系统,不仅能减小网侧电流的谐波,还可较好地抑制负载突变时直流电压的波动,加快整流侧和逆变侧的动态响应,大大提高系统的抗扰能力,从而减小电容体积并降低成本。展开更多
Many conventional switching power supplies in input AC line voltage and filtering it with large electrolytic computers and low power motor drive systems operate by rectifying the capacitors. This results in undesirabl...Many conventional switching power supplies in input AC line voltage and filtering it with large electrolytic computers and low power motor drive systems operate by rectifying the capacitors. This results in undesirable side effects such as the generation of distorted input current waveform. The input power factor is also poor. Further, the input current has the shape of narrow pulses, which in turn increases its value. The reduction in input current harmonics and improved power factor operation of motor drive systems and switching power supplies are important from the energy saving point of view and also to satisfy the harmonic standards. This paper proposes a full bridge PWM rectifier with load current feedforward. The proposed approach has some advantages, including a quick response for the load fluctuation, the reduction of the number of sensors and simplified control, as compared with the conventional methods. From simulated results, it is clarified that the proposed control method is effective and useful.展开更多
文摘针对双PWM变频器整流侧与逆变侧独立控制时,直流侧必须利用大电容稳压,导致系统成本增加且寿命缩短的问题,提出一种整流侧采用引入新型开关矢量表的直接功率控制(Direct Power Control,DPC)方案。该方案逆变侧采用转子磁场定向矢量控制,并采用负载功率前馈控制策略,以实现双PWM变频器的协调控制。仿真实验结果表明,相比独立控制的双PWM变频调速系统,采用该一体化协调控制策略的双PWM变频调速系统,不仅能减小网侧电流的谐波,还可较好地抑制负载突变时直流电压的波动,加快整流侧和逆变侧的动态响应,大大提高系统的抗扰能力,从而减小电容体积并降低成本。
文摘Many conventional switching power supplies in input AC line voltage and filtering it with large electrolytic computers and low power motor drive systems operate by rectifying the capacitors. This results in undesirable side effects such as the generation of distorted input current waveform. The input power factor is also poor. Further, the input current has the shape of narrow pulses, which in turn increases its value. The reduction in input current harmonics and improved power factor operation of motor drive systems and switching power supplies are important from the energy saving point of view and also to satisfy the harmonic standards. This paper proposes a full bridge PWM rectifier with load current feedforward. The proposed approach has some advantages, including a quick response for the load fluctuation, the reduction of the number of sensors and simplified control, as compared with the conventional methods. From simulated results, it is clarified that the proposed control method is effective and useful.
