Performance Evaluation Methods for VSD Control Systems Affected by Torsional Vibrations: Sensitivity and Energetic Analyses

Rossi, Mattia; ElShawarby, K.; Bruha, Martin; Mauri, Marco; Carmeli, Maria Stefania; Dezza, Francesco Castelli

doi:10.1109/iccep.2019.8890227

Cited by 1 publication

(1 citation statement)

References 6 publications

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“…These locations are those where torsional stresses may increase to threaten the shaft components. These Campbell diagrams depend on the VFD topology [15], [16]. The industry does not have a clear method explaining how to plot Campbell diagrams resulting from VFDs.…”

Section: H Figure 1 a Single-line Diagram Of A Pumped Storage Hydropo...mentioning

confidence: 99%

Variable Frequency Drives-Induced Torsional Stresses in Pumped Hydropower Storage Applications

Lingom,

Song-Manguelle,

Betoka-Onyama

et al. 2024

IEEE Access

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Despite consistent maintenance and monitoring equipment installed in pumped storage hydropower (PSH) facilities, many shafts and electrical component failures are reported, possibly resulting from undetected sources. These sources include undetectable vibrations or, in certain conditions, highfrequency mechanical or electrical harmonics. They may induce premature material fatigue and aging, leading to accelerated wear and premature system failure. This paper presents a direct method for plotting Campbell diagrams of large motors supplied by variable frequency drives for torsional analysis purposes. The method is applied to two-level, three-level neutral-point clamped, and seven-level cascaded H-bridge multilevel inverters, commonly used industrially available voltage source inverter (VSI) topologies for pumped PSH plants. These diagrams display the locations where torsional stress components induced by VFDs can interfere with shaft resonance modes. These locations are where threatening torsional stresses can build up. The method simplifies the determination of the magnitude of stimulus forces in the motor airgap that may threaten the shaft. An analytical assessment of the cascaded H-bridge VFD-induced torsional stresses under unbalanced operation is also proposed. The accuracy of the theoretical developments is supported by selected simulations results at different operating points and different fault conditions. Hybrid experimental-numerical VFD-induced harmonic stress analysis is also performed to demonstrate the relevance of the proposed study. Results are crucial for a robust design of the system integration to avoid catastrophic failures.

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Section: H Figure 1 a Single-line Diagram Of A Pumped Storage Hydropo...mentioning

confidence: 99%

Variable Frequency Drives-Induced Torsional Stresses in Pumped Hydropower Storage Applications

Lingom,

Song-Manguelle,

Betoka-Onyama

et al. 2024

IEEE Access

View full text Add to dashboard Cite

show abstract

Performance Evaluation Methods for VSD Control Systems Affected by Torsional Vibrations: Sensitivity and Energetic Analyses

Cited by 1 publication

References 6 publications

Variable Frequency Drives-Induced Torsional Stresses in Pumped Hydropower Storage Applications

Variable Frequency Drives-Induced Torsional Stresses in Pumped Hydropower Storage Applications

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