Control of an inverter output active du/dt filtering method

Korhonen, Juhamatti; Strom, Juha-Pekka; Tyster, Juho; Silventoinen, Pertti; Saren, Hannu; Rauma, Kalle

doi:10.1109/iecon.2009.5414941

Cited by 9 publications

(4 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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 inverter switches are ON during this period and capacitor will get charged to half of the dc link voltage. Hence filter output voltage is given by equation 11, (11) The capacitor charging time interval is obtained from equation 12, (12) The capacitor will discharge for a period of time ( ) during which the output voltage will reach full dc link voltage.…”

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%

See 2 more Smart Citations

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

Mini

Joshi

Satheesh

et al. 2016

IJECE

View full text Add to dashboard Cite

<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>

show abstract

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

View full text Add to dashboard Cite

show abstract

“…Combined Differential-Mode (DM) and Common-Mode (CM) filters, further, feature capacitors connected to the DC-link rails [15,16] and limit both bearing currents [17] and radiated electromagnetic emissions [18]. Finally, as a combination of a passive filter and an active control scheme, an undamped LC-filter can be combined with an adaptive switching cycle to enforce resonant transitions without overshoot [19,20]. Each of these concepts reduces the filter requirements relative to a bulky full sinewave filter, but still require the design, implementation, and realization of multiple passive components that diminish the benefits of the adoption of SiC MOSFETs in VSD systems.…”

Section: Introductionmentioning

confidence: 99%

Analytical Loss Model for Three-Phase 1200V SiC MOSFET Inverter Drive System Utilizing Miller Capacitor-Based dv/dt-Limitation

Haider

Fuchs

Zulauf

et al. 2022

IEEE Open J. Power Electron.

View full text Add to dashboard Cite

Next-generation Variable Speed Drive (VSD) systems utilize SiC MOSFETs to achieve both high efficiency through reduced bridge-leg losses and high power density through an order-of-magnitude increase in switching frequency or reduction of the DC-link capacitance. These systems, however, must contend with the high voltage slew rate (dv DS /dt) of these next-generation power semiconductors, especially in the context of protecting the motor from partial discharge phenomena, surge voltages from cable reflections, and unequal distribution of the voltage across motor windings.We assess the attractiveness of an external Miller capacitor across the bridge-leg power semiconductors to limit the maximum voltage slew rate in a system. To evaluate this technique, we propose a maximum dv DS /dt model, finding that the maximum turn-on slew rate occurs at Zero-Current Switching (ZCS) with an increase in dv DS /dt as the device junction temperature increases. During the turn-off transition, the applied dv DS /dt saturates at a particular current. We then find a switching loss model, arriving at a piecewise-linear dependence of bridge-leg switching losses on current under dv DS /dt-limited conditions, a finding that runs counter to the widely-utilized quadratic current dependence.The proposed models are validated on a SiC MOSFET bridge-leg designed for a 10 kW 800 V DC-link VSD system with a switching frequency of 16 kHz, where the Miller capacitor-based technique achieves lower losses for the same maximum dv DS /dt than a gate resistor-only dv DS /dt-limiting value. This SiC MOSFET bridge-leg achieves peak calculated bridge-leg efficiencies of 99.2 % for a dv DS /dt limitation of 10 V ns −1 and 99.4 % for a limit of 15 V ns −1 .

show abstract