Modeling of Torsional Resonances for Multi-Megawatt Drives Design

Song-Manguelle, Joseph; Sihler, C.; Nyobe-Yome, J.M.

doi:10.1109/08ias.2008.203

Cited by 16 publications

(8 citation statements)

References 14 publications

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“…The following has to be taken into account: − from a theoretical viewpoint, the resonance involves just a frequency value; in practice, the resonance danger involves a frequency range around the theoretical value namely the beat phenomenon: thus, it is more reasonable to consider not only the critical point, but a critical band instead; − another key factor is the amplitude of the exciting harmonic: a harmonic of an amplitude as small as 1% of the rated torque can be dangerous during resonance [13]; however, larger harmonic torque amplitudes accelerate the build-up of vibrations. Table III displays the critical frequencies with their corresponding harmonic amplitudes.…”

Section: B Campbell Diagrammentioning

confidence: 99%

Torsional Vibration Mitigation by Harmonic Inversion through SPWM Carrier Signal Control

Gerlando

ElShawarby

Foglia

et al. 2018

2018 XIII International Conference on Electrical Machines (ICEM)

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The paper analyses torsional vibrations caused by electromagnetic torque harmonics in permanent magnet synchronous generators. A vibration mitigation method is proposed based on changing the phase angle of the carrier signal of sinusoidal PWM in order to invert the phase of the torque harmonic causing resonance. Since the frequency has not changed, the system is still in resonance. Thus, after a given time, the torque harmonic should be inverted again. The process is repeated as long as the system is at or near resonance. A criterion is presented to select the exact phase shift of the carrier needed in order to invert the torque harmonic. A method to calculate both the toggle time needed and the frequency range to apply such technique is presented. With the mitigation technique applied, two cases are considered on Matlab/Simulink, namely sustained operation at resonant frequency and accelerating the machine over some critical points.

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Section: B Campbell Diagrammentioning

confidence: 99%

Torsional Vibration Mitigation by Harmonic Inversion through SPWM Carrier Signal Control

Gerlando

ElShawarby

Foglia

et al. 2018

2018 XIII International Conference on Electrical Machines (ICEM)

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“…A dynamic shaft model can be created using lumped parameters associated with the shaft elements. Such parameters, which include mass moments of inertia, damping coefficients, and stiffness constants between inertia, can be obtained by applying Newton's second law [32], as demonstrated in Equation ( 7). where: 𝜃 is the vector of angular displacements of twists of individual disks to a common reference in radians.…”

Section: A Model Of a Multi-inertia Shaft Systemmentioning

confidence: 99%

A Power Quality Assessment of Electric Submersible Pumps Fed by Variable Frequency Drives under Normal and Failure Modes

et al. 2023

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This paper proposed a simplified modeling approach for a power quality (PQ) assessment of Electric Submersible Pumps (ESP) systems supplied by the two-level, the neutral-point-clamped three-level, and the cascaded H-bridge (CHB) multilevel inverter VFD topologies. The VFD switching function models and their analytical expressions are proposed to understand how they can create high-frequency components that might excite the resonance mode in a transmission cable or a rotating shaft system. Voltage, current, and motor airgap torque harmonics induced by each VFD topology in a balanced operation mode are derived and correlated to the PWM carrier and motor operating frequencies. The motor airgap harmonics are calculated based on Concordia’s transformation of voltages and currents in αβ-plan. These harmonic components are represented in the form of Campbell diagrams. An analysis of harmonics under unbalanced conditions was also conducted in a CHB VFD topology-powered ESP system with failed and bypassed cells. The investigated modulation technique is a neutral-shift PWM method that enables the system to operate balanced line-line voltages even if the line-neutral voltages are unbalanced. The effects of modifying the electrical spectrum using the neutral-shift PWM method on electrical and mechanical spectra are analyzed. The results of the Matlab/Simulink-based simulation show that the proposed full ESP system model is highly accurate in both normal and failure modes. The results are consistent with theoretical predictions and are graphically shown in the time and frequency domains for easy analysis. Hybrid experimental–numerical results on a reduced-scale laboratory setup are also discussed to confirm the correctness of the suggested developments.

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“…Assuming f cut−in = 0.3 • f rated = 4.42 Hz, the limit frequencies are assumed to be 7.5 and 11.5 Hz, then two cases are considered: the former avoids the excitation of the T N F 1 , while the latter avoids the excitation of both T N F 1 and T N F 2 . For each case the values of m f are calculated by choosing the first odd m f and multiple of three satisfying (1) and are labeled as m f,T N F 1 and m f,T N F 2 . Fig.…”

Section: Harmonic Distortion and Converter Losses Analysismentioning

confidence: 99%

“…Converter modulation techniques generate torque harmonics which subsequently excite the natural resonance frequency of the drive-train. Torque harmonics amplitudes as low as 1% of the rated torque can be dangerous [1]. Torsional vibrations is even a bigger concern for high power applications thus various mitigation techniques have been studied [2]- [7].…”

Section: Introductionmentioning

confidence: 99%

A Practical Solution for Torsional Vibrations Evasion in Variable Speed Drives

ElShawarby

Perini

Foglia

et al. 2019

IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society

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The paper presents a practical solution for an existing drive-train to avoid torsional vibrations for variable speed drives under SPWM modulation technique. Torsional natural frequencies can be a problem because either ill defined in design stage or one of the mechanical parameters has changed after the initial design stage. The proposed method comprises of dividing the frequency range into several partitions where in each partition a value of modulation frequency ratio m f is chosen. A criterion is developed to choose m f based on avoiding torsional excitations with the minimum converter losses. Torque harmonic distortion and converter losses are analyzed. Matlab/Simulink is used to validate the approach.

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Modeling of Torsional Resonances for Multi-Megawatt Drives Design

Cited by 16 publications

References 14 publications

Torsional Vibration Mitigation by Harmonic Inversion through SPWM Carrier Signal Control

Torsional Vibration Mitigation by Harmonic Inversion through SPWM Carrier Signal Control

A Power Quality Assessment of Electric Submersible Pumps Fed by Variable Frequency Drives under Normal and Failure Modes

A Practical Solution for Torsional Vibrations Evasion in Variable Speed Drives

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