Interaction of Drive Modulation & Cable Parameters on AC Motor Transients
نویسنده
چکیده
This paper investigates over-voltage transients on ac induction motors when connected through a cable of arbitrary length to a Variable Frequency Drive (VFD) consisting of a Pulse Width Modulation (PWM) inverter with Insulated Gate Bipolar Transistor (IGBT) power devices. Factors contributing to a motor over-voltage transient equal to a theoretical twice dc bus voltage are first described using existing transmission line analysis. A critical cable distance lc is defined where this 2 pu over-voltage occurs. However, literature is lacking on how motor voltage transients > 2 pu bus voltage and up to 3 4 pu are generated. This phenomenon is observed on all PWM inverters with output cable lengths greater than lc distance. Contributing factors to the > 2 pu over-voltage phenomenon are investigated by exploring the complex interaction between drive modulation techniques, carrier frequency selected, cable natural frequency of oscillation, cable high frequency damping losses and to a lesser extent inverter output rise time. Theoretical calculations of cable frequency and damping are correlated with simulation and experimental results. Novel modifications to the PWM modulator as well as external hardware apparatus are proposed solutions to the > 2 pu over-voltage problem, both are simulated and experimentally confirmed.
منابع مشابه
Analysis of EMI conducted by a PWM inverter - fed AC motor drive
This work analyses the conducted EMI generated by an inverter-fed induction motor drive system with the pulse with modulation (PWM) as one of the most difficult current technical problem which limits power electronics drive's evolution. The analysis of the impedance characteristics of the converters load (motor and cable) is fundamental to interpret the common and differential mode of emission ...
متن کاملSpace Vector Pulse Width Modulation with Reduced Common Mode Voltage and Current Losses for Six-Phase Induction Motor Drive with Three-Level Inverter
Common-mode voltage (CMV) generated by the inverter causes motor bearing failures in multiphase drives.On the other hand, presence of undesired z-component currents in six-phase induction machine (SPIM) leads to extra current losses and have to be considered in pulse width modulation (PWM) techniques. In this paper, it is shown that the presence of z-component currents and CMV in six phase driv...
متن کاملA Novel Active Filter for Mitigation of EMI and Other Adverse Effects of PWM Inverter-Fed AC Motor
This paper presents novel active filter for mitigation electromagnetic interference (EMI) and other adverse effects of pulse width modulation (PWM) inverter-fed AC motor system. An active filter proposed and devised for this system is characterized by sophisticated connection of two small separate filters, capable of mitigating all the adverse effects. This paper provides high frequency models ...
متن کاملA Current-Based Output Feedback Sliding Mode Control for Speed Sensorless Induction Machine Drive Using Adaptive Sliding Mode Flux Observer
This paper presents a new adaptive Sliding-Mode flux observer for speed sensorless and rotor flux control of three-phase induction motor (IM) drives. The motor drive is supplied by a three-level space vector modulation (SVM) inverter. Considering the three-phase IM Equations in a stator stationary two axis reference frame, using the partial feedback linearization control and Sliding-Mode (SM) c...
متن کاملModified Bi-directional AC/DC Power Converter with Power Factor Correction
Most existing power converters and industrial motor drive systems draw non-sinusoidal currents from the supply. Non-sinusoidal currents contained harm harmonics disturb the power supply which it causes serious concern for reliability. Other equipments that use the same power supply are adversely affected. This paper suggests the operation and performance of a new modified AC/DC converter that ...
متن کامل