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Active du/dt output filtering is a previously presented method to reduce the variable-speed AC drive cable reflection overvoltages. It uses a passive LC low-pass filter and a pulse pattern from IGBT phase leg to control the filter output voltage slopes. The pulse pattern has to be formed in accordance to the LC filter resonant frequency, and timing errors will show up as additional overshoot at the...
Inverter-fed motor drives can be subject to transient overvoltage problems caused by switching operations. An overvoltage suppression method for parallel inverters that uses no passive filtering components and a new modulation strategy are presented in this paper. The used modulation strategy allows pulse accumulation at the motor terminals which mitigates the overvoltage. The method is verified by...
Active is a new output-filtering method to mitigate motor overvoltages. The inverter pulse pattern edges are broken down into narrower pulses, which control the filter circuit. This results in an output voltage that does not have to exhibit the overshoot typically seen in common circuits in output-filtering applications. Furthermore, the shape of the output-voltage edge has properties...
Inverter-fed motor drives can be subject to transient overvoltage problems caused by switching operations. Motor terminal overvoltages may occur if a motor is fed through a long motor cable. These overvoltages may result in a premature motor insulation failure. The phenomenon exists whether the motor is fed by a single inverter or parallel inverters. A modulation strategy and a parallel inverter topology...
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