Modeling of Dual-PWM Adjustable Speed Drives for Characterizing Input Interharmonics Due to Torque Oscillations

Yang, Dirui; Zhou, Zhongzheng; Liu, Yunlong; Jiang, Jianguo

doi:10.1109/jestpe.2020.2983876

Cited by 7 publications

(3 citation statements)

References 25 publications

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“…It has been documented that in special cases, such as when the inverter is in overmodulation or when the load is unbalanced [34], interharmonics of current can be expected in supply systems. The magnitudes, frequencies and phase sequence of these interharmonics can vary depending on the operating conditions of the motor [43,50], imbalances in currents, supply voltage (including switching angles) and fluctuating mechanical loads, among other factors [45,49,[51][52][53][54]. Different load values and torque oscillations can also contribute to the generation of interharmonics.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Interharmonics Generation in Induction Motors Driven by Variable Frequency Drives and AC Choppers

Gudiño-Ochoa,

Jalomo-Cuevas,

Molinar-Solís

et al. 2023

Energies

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In modern power systems, interharmonics have emerged as noninteger frequency components that appear in current or voltage signals. Double-stage AC-DC-AC converters have been identified as a primary source of interharmonics. Previous studies have highlighted modulation techniques, filters, passive components, unbalanced conditions and DC link effects as relevant factors. However, the interaction between these factors and the inertial properties of induction motors has not been explored. This study assesses various types of AC drives, including variable frequency drives (VFDs) and soft starters (AC choppers), to investigate their interaction with machine inertial properties in interharmonic generation. The employed technique for time-frequency spectral analysis is the wavelet synchrosqueezed transform combined with a clustering method. This paper demonstrates that the interaction of the inertial properties of low-power induction motors with the variations of the switching frequencies of the VFDs, the filters used in the DC link and a soft start indirectly contribute to harmonic generation and potentially to interharmonics in the electrical grid and the outputs of the inverter.

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Section: Introductionmentioning

confidence: 99%

Analysis of Interharmonics Generation in Induction Motors Driven by Variable Frequency Drives and AC Choppers

Gudiño-Ochoa,

Jalomo-Cuevas,

Molinar-Solís

et al. 2023

Energies

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“…Nowadays, with high‐power dual‐PWM ASDs' broad applications in various industries, low‐frequency oscillations (LFO) are becoming a concern in power system operations, and especially posing a serious threat to the safe and stable operation of the system [4]. Especially in the industrial distribution grid and micro‐grid where the ASDs experience almost all the loads, such as railway‐traction power supply systems [5], port distribution grid [6], and electric ship power systems [7], the LFO events long exist and will occur more often, which seriously jeopardise the power quality and stabilisation.…”

Section: Introductionmentioning

confidence: 99%

Impedance modelling and stability assessment for grid‐connected dual‐PWM adjustable speed drives with motor torque oscillations

Yang

Jiang

2022

IET Electric Power Appl

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The grid‐connected dual‐PWM adjustable speed drives (ASDs) modulate the energy of the motor torque oscillation and inject it into the power system, potentially causing low‐frequency oscillation (LFO) in the grid. In this study, considering the motor torque oscillation and harmonic common‐modulation of the both‐side converters, the precise sequence impedance models are derived for dual‐PWM ASDs using the harmonic linearisation method. Based on the derived impedance of dual‐PWM ASD, the torque oscillation, which is equivalent to the time‐varying impedance, causes a series of discontinuities at the torque‐oscillation‐related frequencies on its amplitude‐frequency curve. Moreover, these discontinuous drops make it more likely to intersect with the amplitude‐frequency curve of the grid impedance, which may lead to LFO of the grid. Then, by applying the proposed impedance model and Bode plot, the stability of the grid‐ASD cascade system with motor torque oscillation is assessed. The conclusions of stability analysis demonstrate the exact mechanism that the mechanical system oscillations lead to the grid‐converter cascade system instability through the common‐modulation and coupling of the dual‐PWM ASD. Finally, experimental results on a 3 kW ASD system in the laboratory and measured results on the distribution grid in the Shanghai Yangshan Deepwater Port area verify the correctness and effectiveness of the proposed model and stability assessment.

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“…Aiming at the DC-link voltage fluctuation caused by reducing the capacitance, a voltage fluctuation suppression strategy was proposed, which could adopt the sampled DC-link voltage to control the motor to suppress the power fuctuation on DC-link [14]. A precise calculation method for estimating the frequencies and amplitudes of dual-PWM adjustable speed drives input interharmonic due to torque oscillations is provided [15].…”

Section: Introductionmentioning

confidence: 99%

Multisource Oscillation Suppression Control of Magnetic Levitation High Speed Permanent Magnet Motor

2022

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The multi-source oscillation of magnetic levitation permanent magnet motor (ML-PMM) under high speed operation is inevitable. The reasons are the influence of the strong coupling characteristics of high speed permanent magnet motor(HSPMM), the nonlinear characteristics of power converter and the coupling characteristics of magnetic levitation control system. Aiming at the multi-source oscillation caused by magnetic levitation system and HSPMM, the multi-source oscillation suppression control method suitable for magnetic levitation-high speed permanent magnet motor(ML-HSPMM) is studied in this paper. The stability of ML-HSPMM and the small signal model of the motor are analyzed. Finally, the control strategy of is verified by simulation and experiment.

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Modeling of Dual-PWM Adjustable Speed Drives for Characterizing Input Interharmonics Due to Torque Oscillations

Cited by 7 publications

References 25 publications

Analysis of Interharmonics Generation in Induction Motors Driven by Variable Frequency Drives and AC Choppers

Analysis of Interharmonics Generation in Induction Motors Driven by Variable Frequency Drives and AC Choppers

Impedance modelling and stability assessment for grid‐connected dual‐PWM adjustable speed drives with motor torque oscillations

Multisource Oscillation Suppression Control of Magnetic Levitation High Speed Permanent Magnet Motor

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