Active $du/dt$—New Output-Filtering Approach for Inverter-Fed Electric Drives

Strom, J-P; Korhonen, Juhamatti; Tyster, Juho; Silventoinen, Pertti

doi:10.1109/tie.2010.2093480

Cited by 45 publications

(13 citation statements)

References 16 publications

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“…The motor impedance is much higher than the characteristic impedance of cable and hence due to impedance mismatch the travelling wave reflects back. If the propagation time is more than half of rise time ( , the motor terminal voltage will shoot up to double the amplitude of input voltage [2], [12], [13] .Propagation time ( ) is the time taken by the pulse to reach the other end of the cable. Rise time ( ) is the time taken by the applied voltage to reach approximately 90% of the desired magnitude of voltage.…”

Section: Voltage Reflection Theorymentioning

confidence: 99%

“…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%

“…In active dv/dt filtering, edge modulation has to be done for the voltage step in addition to normal phase voltage modulation at the switching frequency. If load current and initial filter current are considered as zero then PWM modification can be done by providing modified delay pulses based on equations (12) and (13). The capacitor charges or discharges depending on the slope directions, when the filter voltage reached half the total voltage transition, the power switches are turned off and the inductor current goes through the freewheeling diodes of opposite switches.…”

Section: Modification Of Pwm Sequence For Active Controlmentioning

confidence: 99%

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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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Section: Voltage Reflection Theorymentioning

confidence: 99%

Section: Active Control Of Lc Clamp Dv/dt Filtermentioning

confidence: 99%

Section: Modification Of Pwm Sequence For Active Controlmentioning

confidence: 99%

See 1 more Smart Citation

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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“…High du/dt is generated owing to the PWM waves. Some adverse effects of the PWM technique, such as high insulation stresses and bearing currents [1][2][3][4], may result in the reduction of the service life. In addition, extra noise may be caused by voltage harmonics.…”

Section: Introductionmentioning

confidence: 99%

Sliding mode control with open‐switch fault diagnosis and sensorless estimation based on PI observer for PMSM drive connected with an LC filter

Wang

Zou

2020

IET Power Electronics

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In some cases, LC filters are installed between the inverters and motors to suppress the adverse effects of pulse width modulation. However, some techniques should be modified, because the mathematical model of the drive system is changed by the LC filter and the sensors on the inverter output cannot measure some necessary variables. In this study, a multipurpose proportional-integral (PI) observer is proposed at first. The type of observer depends on whether the position sensor is equipped. A sliding mode controller for the LC filter based on the observer is presented, therefore improving the dynamic performance. Furthermore, if the position sensor of the rotor is equipped, an open-switch fault diagnostic method is realised by means of the PI observer; if the position sensor is not equipped, the sensorless estimation is realized. The proposed strategies were realised without any additional current/voltage sensors. Experimental results verified the effectiveness of the proposed strategies.

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“…Most of the PMSMs are driven by voltage source inverters (VSIs), and pulse width modulation (PWM) technique is widely implemented in the control techniques of VSI. Because PWM waves are asymmetric pulses, it may result in bearing currents and overvoltage [1][2][3][4][5][6]. The service life of the motor may be damaged.…”

Section: Introductionmentioning

confidence: 99%

Sliding-Mode-Observer-Based Open-Switch Diagnostic Method for Permanent Magnet Synchronous Motor Drive Connected with LC Filter

Wang¹,

Xu²,

Zou³

2019

Energies

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At present, pulse width modulation (PWM) technique is widely applied in motor drive systems. However, it may cause some unexpected effects: Bearing currents, overvoltage, power losses and unwanted noise. In some industrial cases, LC filters are always equipped in motor drive systems to suppress those unexpected effects. In order to improve the reliability and safety of the drive system, fault diagnostic strategies for power switches should be utilized as other drive systems without LC filters. In the literature, some open-switch diagnostic approaches are based on the observers derived from the mathematical models. However, the models are changed by the LC filters. Therefore, the existing approaches, based on the observers are failed, due to the change of the models. This study proposes an open-switch diagnostic method for permanent magnet synchronous motor (PMSM) drive equipped with LC Filter. The novelty of the proposed method is that the model of the LC filter is considered. Therefore, open-switch faults can be detected and located in the drive systems with LC filters. The switching function model of the drive system is analyzed at first. Then a sliding mode observer (SMO) considering the model of the filter is proposed to estimate the filter voltages and other state variables. Consequently, the faults can be detected and located through the residual errors between the expected and estimated filter voltages. This approach features simplicity. Furthermore, any extra sensors are not necessary. Experimental results on a 750-W PMSM drive system with an LC filter proved the feasibility of the proposed method.

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Active $du/dt$—New Output-Filtering Approach for Inverter-Fed Electric Drives

Cited by 45 publications

References 16 publications

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

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

Sliding mode control with open‐switch fault diagnosis and sensorless estimation based on PI observer for PMSM drive connected with an LC filter

Sliding-Mode-Observer-Based Open-Switch Diagnostic Method for Permanent Magnet Synchronous Motor Drive Connected with LC Filter

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