An overvoltage suppression scheme for AC motor drives using a half DC-link voltage level at each PWM transition
An overvoltage suppression scheme for AC motor drives using a half DC-link voltage level at each PWM transition
复制标题
用于交流电机驱动器的过压抑制方案，在每次 PWM 转换时使用半直流母线电压电平
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
K. Nam
中科院分区：
文献类型：
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作者：
Sang;K. Nam
无源滤波器通常用于抑制电机端子中的过电压，通过降低逆变器输出端的电压上升率或通过降低电机端子阻抗来实现。我们提出了一个过压抑制方案，使无源滤波器的使用是不必要的。这种方法与一般滤波方法的不同之处在于，它与d/spl upsi//dt无关，并且不试图减小d/spl upsi//dt。我们的方案在每个脉宽调制电压转变处利用中间电压电平V/sub DC//2，其中V/sub DC/表示DC链路电压。中间电压电平的持续时间被控制为使得在电动机端子处抵消反射电压。当V/sub DC//2的持续时间等于电缆的传输延迟的两倍时，实现最佳消除。此外，如果在电动机端子和逆变器输出处的反射系数等于/spl plusmn/1，则不会发生过电压。所提出的方案需要使用六个辅助绝缘栅双极晶体管开关。模拟以及实验结果在这里。
Passive filters are conventionally used to suppress overvoltage in the motor terminal, either by reducing the voltage rise rate at the inverter output, or by decreasing the motor terminal impedance. We propose an overvoltage suppression scheme that renders the use of passive filters unnecessary. This approach differs from general filter methods, in that it is independent,of d/spl upsi//dt and does not try to reduce d/spl upsi//dt. Our scheme utilizes the middle voltage level V/sub DC//2 at each pulsewidth modulation voltage transition, where V/sub DC/ represents the DC-link voltage. The duration of the middle voltage level is controlled in such a way that reflected voltages are cancelled out at the motor terminal. Optimal cancellation is achieved when the duration of V/sub DC//2 is equal to twice the transport delay of the cable. Further, if reflection coefficients at the motor terminal and the inverter output are equal to /spl plusmn/1, no overvoltage takes place. The proposed scheme requires the use of six auxiliary insulated gate bipolar transistor switches. Simulation as well as experimental results are presented here.