Design and implementation of an inverter output LC filter used for dv/dt reduction

Habetler, T.G.; Naik, R.; Nondahl, Thomas A.

doi:10.1109/apec.1999.750532

Cited by 14 publications

(12 citation statements)

References 7 publications

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“…The time derivative of stator voltage is inversely proportional to the square root of filter capacitance of the LC filter [32] and is given by sm dc eq f dv V dt LC  (16) Higher filter capacitance in PM than that of SM is also beneficial from the dv/dt aspect, as it reduces the rate of rise of the motor terminal voltage and it is experimentally verified and compared in Section IV.…”

Section: F Reduction Of Dv/dt At Motor Terminalmentioning

confidence: 99%

Design, Analysis, and Impacts of Sinusoidal LC Filter on Pulsewidth Modulated Inverter Fed-Induction Motor Drive

Mishra

Maheshwari

2020

IEEE Trans. Ind. Electron.

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Squirrel cage induction motor (SQIM) fed by a pulse width modulated voltage source inverter (VSI) is subjected to voltage and current surges. It may cause additional losses in the motor, insulation failure, high bearing current, and electromagnetic interference. To mitigate these problems, sinusoidal LC filter is placed at the ac-side of the VSI. This paper proposes a new methodology to design the filter. In this method, the filter inductance is chosen based on the maximum ripple in the inverter ac-side current and the voltage drop across the filter inductor, and the filter capacitor is chosen based on the steady-state reactive power demand of the SQIM. The effects of the designed filter on the switch current, losses in the drive, temperature of the dc-link capacitor, dv/dt at the motor terminal, stator flux, and air-gap torque of the SQIM are discussed. The performance of the drive with the filters, designed by the proposed method and the standard method, are experimentally tested on a two-level Silicon carbide (SiC) VSI fed SQIM and comparative analysis is carried out. The impact of the designed filter on the drive is also shown when the neutral point of the filter capacitors is connected with the mid-point of the dc-link. The stability of the closed-loop controlled SQIM drive with the proposed filter, and simulation results are presented to verify its performance. Index Terms-Sinusoidal LC filter, squirrel-cage induction motor drive, variable-frequency operation. The following impacts of the filters designed by PM and SM are discussed, and comparative analysis is carried out: 1) The switch current of the VSI and the cumulative power loss in the drive with two filters have been discussed. 2) The effects of the two filters on the dc-link capacitor of the VSI have been discussed.

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Section: F Reduction Of Dv/dt At Motor Terminalmentioning

confidence: 99%

Design, Analysis, and Impacts of Sinusoidal LC Filter on Pulsewidth Modulated Inverter Fed-Induction Motor Drive

Mishra

Maheshwari

2020

IEEE Trans. Ind. Electron.

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“…The filter discharging time is same as the charging time ( = )and during intervel inverter voltage pulses are off. (13) Now the rise time of the output voltage is increased and the rise time is calculated using equation (14). 143.…”

Section: Active Control Of Lc Clamp Dv/dt Filtermentioning

confidence: 99%

Active LC Clamp dv/dt Filter for Voltage Reflection due to Long Cable in Induction Motor Drives

Mini

Joshi

Satheesh

et al. 2016

IJECE

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<p class="JESAbstract">This paper presents an active LC clamped dv/dt filter to mitigate the over voltages appearing across the motor terminals. The over voltages at motor terminal is due to voltage reflection effect of long motor cable connected between high frequency PWM inverter having high dv/dt switching waveforms and ac motor drives. The voltage reflection due to fast switching transients can be reduced by increasing the rise time and fall time of inverter output voltage pulses. The most commonly available mitigating technique is a passive dv/dt filter between inverter and cable. Since, size, cost and losses of passive LC dv/dt filter is more, an active dv/dt filtering technique is used to reduce over voltage at motor terminals. Active LC clamp filtering technique used here consists of a small LC filter designed for a single motor cable length which can be used for any lengths of cable up to 1000m only by changing the active control of the PWM pulses to achieve the desired voltage slope during voltage transition period. The basic principle of active dv/dt filer used here is to charge and discharge the capacitor in the filter with modified PWM pulses to increase the rise time and fall time of output voltage pulses without any extra devices to handle the transient response of the LC filter. Detailed investigation is carried out by simulation using MATLAB-Simulink software with active control of common LC clamp dv/dt filter suitable for various cable lengths ranging from 100 m to 1000 m. Comparative analysis is done with active dv/dt filter designed with a common LC clamp filter and active LC clamp dv/dt filter designed for various cable lengths and also with diode clamped passive dv/dt filter. The results proves the effectiveness of the active common LC dv/dt filter to mitigate the over voltages at motor terminal for cable lengths up to 1000m.</p>

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“…dissipation becomes a problem such that the capability of the devices cannot be fully utilized. Operating at high gradients requiers installing expensive output filters to protect the motor against switching overvoltages and bearing currents [7]. Analytical models have been used to investigate the switching properties of IGBTs and to control the voltage gradient [6].…”

Section: Introductionmentioning

confidence: 99%

Sensorless control of induction motor drives

2002

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Medium voltage IGBTs are fast switching devices that require low gate drive power. They inherently generate high voltage and current gradients during switching transitions. These are generally limited by retarding the changes of the gate charge. Additional gate resistors are usually installed for this purpose. The drawback is high switching losses.A novel method is described in this paper that aims at controlling the voltage and current gradients during switching transitions. The gate charge of the input MOS device is controlled by injected gate currents. These follow particular command functions that are predefined and stored in a memory. The method requires reacting within microseconds which traditional closed loop control cannot do. Specific time events are therefore defined to trigger the respective command function. These functions depend on the instantaneous values of the collector current or the collector-emitter voltage, variables that are identified without delay, knowing their predefined gradients and counting the time from the respective event to reach their final values.Experimental results show the performance of event driven control. Low current and voltage gradients are enforced while the switching losses are reduced.

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Design and implementation of an inverter output LC filter used for dv/dt reduction

Cited by 14 publications

References 7 publications

Design, Analysis, and Impacts of Sinusoidal LC Filter on Pulsewidth Modulated Inverter Fed-Induction Motor Drive

Design, Analysis, and Impacts of Sinusoidal LC Filter on Pulsewidth Modulated Inverter Fed-Induction Motor Drive

Active LC Clamp dv/dt Filter for Voltage Reflection due to Long Cable in Induction Motor Drives

Sensorless control of induction motor drives

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