PWM inverters and their influence on motor overvoltage
PWM inverters and their influence on motor overvoltage
复制标题
PWM逆变器及其对电机过压的影响
DOI：
--
复制
发表时间：
1997
期刊：
影响因子：
--
通讯作者：
G. Skibinski
中科院分区：
文献类型：
--
作者：
R. Kerkman;D. Leggate;D. Schlegel;G. Skibinski
现代电压源脉宽调制（PWM）逆变器将可调速AC驱动器提升到与DC驱动器相当的性能水平。为了实现这一目标，电压源逆变器（VSI）现在采用第三代绝缘栅双极晶体管（IGBT）;然而，与这些器件相关的快速上升时间会产生意想不到的后果。本文研究了由IGBT PWM VSI引起的电机过电压。以前的调查表明，存在一个关键的电力电缆距离，超过该距离，总线电压（2 pu）的终端电压是可能的。这主要取决于器件的上升时间和电缆特性。本文探讨了电动机电压>2 pu的原因及解决办法。与电机电压/spl ges/2 pu相比，电机电压>2 pu主要取决于PWM载波频率和调制策略。此外，该文件表明，电机电压高达3-4 pu是可能的。提出了对PWM调制器和调制信号的软件修改，以降低>2 pu的电机过电压。另外，公开并实验性地证明了在现场可编程门阵列（FPGA）内容易实现的硬件校正。
Modern voltage source pulse width modulation (PWM) inverters have elevated adjustable speed AC drives to a performance level comparable to DC drives. To accomplish this, voltage source inverters (VSI) now employ third generation insulated gate bipolar transistors (IGBT); however, the fast rise times associated with these devices produce unintended consequences. This paper examines motor overvoltages resulting from IGBT PWM VSI. Previous investigations have shown a critical power cable distance exists beyond which twice bus voltage (2 pu) terminal voltages are possible. This is determined primarily by the rise time of the devices and cable characteristics. This paper investigates motor voltages >2 pu, their cause and solution. In contrast to motor voltages /spl ges/2 pu, the paper shows motor voltages >2 pu primarily are determined by the PWM carrier frequency and modulation strategy. Furthermore, the paper demonstrates motor voltages up to 3-4 pu are possible. Software modifications to the PWM modulator and modulating signal are presented to reduce >2 pu motor overvoltage. Additionally, a hardware correction, easily implemented within a field programmable gate array (FPGA), is disclosed and experimentally demonstrated.