Interaction of drive modulation and cable parameters on AC motor transients

Kerkman, R.J.; Leggate, D.; Skibinski, G.L.

doi:10.1109/28.585863

Cited by 217 publications

(46 citation statements)

References 8 publications

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“…This is another reason for a reduction of the sampling rate as much as possible. From previous experimental investigations presented in [34], a rule of thumb could be defined saying that the necessary sampling rate for an accurate detection of a change in the machine's hf-behavior should be 20 times higher than the highest interesting frequency in the amplitude spectrum. As has been shown in Figs.…”

Section: Measurement Resultsmentioning

confidence: 99%

“…The machine impedance is, by far, bigger than the cable impedance. Thus, in theory, the voltage pulse is fully reflected (reflection coefficient nearly one) [34]. The reflected voltage pulse leads to an oscillating transient overvoltage with decaying magnitude.…”

Section: A High-frequency Behavior Of Inverter-fed Drivesmentioning

confidence: 99%

“…The reason for this stress is the occurring transient overvoltage resulting from reflections of the applied voltage pulse at the machine's terminal connections. According to the traveling wave theory, the mismatch of machine and supply cable impedances leads to these reflections [34]. The machine impedance is, by far, bigger than the cable impedance.…”

Section: A High-frequency Behavior Of Inverter-fed Drivesmentioning

confidence: 99%

See 2 more Smart Citations

Induction Machine Insulation Health State Monitoring Based on Online Switching Transient Exploitation

Nußbaumer

Vogelsberger²,

Wolbank

2015

IEEE Trans. Ind. Electron.

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Today's variable-speed drives are usually operated close to their maximum tolerable conditions. The fast switching of modern power electronic devices leads to high stress of the winding insulation. As a result, an insulation breakdown may lead to sudden breakdown and high economic loss. To avoid unpredictable downtimes and enable repair on demand, monitoring of the insulation health state is getting more and more important. This paper proposes a method to monitor changes in the insulation health state by evaluating the machine high-frequency properties. The deterioration of the insulation condition is usually linked with a change of insulation capacity and thus also influences high-frequency properties. Initiating a voltage step excitation of the machine by the switching of the inverter, the high-frequency properties can be identified by measuring the resulting current response. This response is usually seen as current signal ringing and contains the machine high-frequency information. By applying signal processing tools, changes in the high-frequency information are extracted, and an insulation state indicator is derived. The applicability of the method is verified by measurements on two test machines (5.5 kW and 1.4 MW) having different power ratings as well as different insulation systems.

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Section: Measurement Resultsmentioning

confidence: 99%

Section: A High-frequency Behavior Of Inverter-fed Drivesmentioning

confidence: 99%

Section: A High-frequency Behavior Of Inverter-fed Drivesmentioning

confidence: 99%

See 1 more Smart Citation

Induction Machine Insulation Health State Monitoring Based on Online Switching Transient Exploitation

Nußbaumer

Vogelsberger²,

Wolbank

2015

IEEE Trans. Ind. Electron.

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“…One of them is the generation of transient overvoltages at motor terminals, due to the PWM pulses propagation and reflection at cable endings. The resulting voltage peaks can reach up to three times the converter D.C. link voltage (V DC ) [4] and, in critical cases, can reduce the motor insulation life to a few weeks [5]. Besides, in every voltage transition from zero to V DC or vice-versa, all the distributed cable capacitance is successively charged or discharged, resulting in a high-frequency transient current component overlapped to the fundamental output inverter current.…”

Section: Introductionmentioning

confidence: 99%

Driving AC motors through long distances with DC transmission: Experimental results

Paula

Almeida

Pereira

et al. 2014

2014 IEEE Industry Application Society Annual Meeting

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Driving induction motors with PWM inverters through long distances result in several undesired high frequency phenomena, such as transient overvoltages at the motor terminals, common-mode currents flowing through the system and the presence of a cable charging current, among others. Instead of filters, which represent the traditional method for the mitigation of these problems, in a previous work the authors proposed an alternative solution, where the rectifier and inverter bridges are separated and connected by the long cable, being the latter located right besides the motor. This alternative configuration, based on DC transmission, aside from solving the aforementioned problems, provides the additional benefits of reducing the voltage drop in the cable and providing copper economy for the power transmission. In this context, in the present work a prototype of a long cable motor drive system was built in both configurations (conventional and with DC transmission). Several results involving the transient overvoltages, cable charging and commonmode currents were obtained from each system and compared, in order to demonstrate the effectiveness of the proposed drive system topology in reducing these undesirable phenomena.

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“…It has been suggested to represent the power cable as a lumped-parameter transmission line with lossless characteristic [8][9][10][11]. Lumped parameter models show inaccuracies when over-voltage greater than twice DC bus voltage and a distributed-parameter transmission line was suggested in [12]. The lumped-parameter section model was suggested to model the cable with adequate number of segments in [13] to compute the over-voltage phenomena and common-mode current.…”

Section: Introductionmentioning

confidence: 99%

High frequency modeling and analysis of voltage reflection in the three-level PWM inverter-fed high power induction motor drive system

Xue

Pan

Chenglin

et al. 2014

2014 17th International Conference on Electrical Machines and Systems (ICEMS)

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In the pulse-width modulated (PWM) inverter-fed motor drive system, the rapidly changing voltage resulting from high frequency switching operation of IGBTs can create severe insulation problems for an induction motor. Presently, the research of the PWM pulse voltage reflection is basically based on the two-level inverter and the induction motor that the rated power is less than 200kW. This paper investigated the voltage reflection in the three-level inverter-fed motor drive system and a restraint strategy of the voltage reflection is proposed. The simulation study and experiment result show that, the simulation and the experiment result matched well and the reflection of the traveling voltage wave at the cable end was greatly restrained.I.

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Interaction of drive modulation and cable parameters on AC motor transients

Cited by 217 publications

References 8 publications

Induction Machine Insulation Health State Monitoring Based on Online Switching Transient Exploitation

Induction Machine Insulation Health State Monitoring Based on Online Switching Transient Exploitation

Driving AC motors through long distances with DC transmission: Experimental results

High frequency modeling and analysis of voltage reflection in the three-level PWM inverter-fed high power induction motor drive system

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