Power Quality Dynamics in Induction Motor Systems
Summary
Induction motors are ubiquitous in industry owing to their robustness and high efficiency, yet their performance is highly sensitive to power quality disturbances. Voltage harmonics, subharmonics and interharmonics arising from non-linear loads and power electronic converters distort the supply waveform, causing torque pulsations, increased losses and mechanical vibrations that shorten motor lifespan. Voltage unbalance and flicker can induce negative-sequence currents, leading to overheating and uneven magnetic forces. Dynamic loading and grid weakpoints, such as long cable runs or remote microgrids, exacerbate these effects, demanding active control and filtering solutions. Recent advances intertwine control theory, signal processing and power electronics to monitor, analyse and mitigate distortions in real time. In addressing these challenges, researchers aim not only to preserve motor reliability but also to enable the integration of renewable generation and to optimize energy consumption across global industrial sectors.
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Power Quality Dynamics in Induction Motor Systems publication trend
The graph below shows the total number of articles in power quality dynamics in induction motor systems across all publications each year (not limited to Nature Index journals).
Technical terms
Harmonic distortion: Deviation of a voltage or current waveform from its pure sinusoid due to integer-multiple frequency components.
Interharmonics: Frequency components in a power system that are not integer multiples of the fundamental frequency, causing oscillatory torque and vibration.
Subharmonics: Frequency components below the fundamental supply frequency that can resonate with mechanical modes and induce torsional stress.
Total harmonic distortion (THD): Quantitative measure of the combined magnitude of all harmonic components relative to the fundamental.
Z-source inverter: Power converter topology that employs an impedance network to boost voltage and ride through disturbances while feeding an induction motor.
Negative-sequence component: Unbalanced three-phase currents or voltages that produce reverse rotating fields in motors, leading to overheating and losses.
References
- Observer-based robust servomechanism control of a three-phase induction motor drive. Journal of Electrical Systems and Information Technology (2024).
- Analysis of Interharmonics Generation in Induction Motors Driven by Variable Frequency Drives and AC Choppers. Energies (2023).
- Effect of Ripple Control on Induction Motors. Energies (2023).
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