Elimination Methods for High-Frequency Harmonics on the DC Side of Modular Multilevel Converters from the Perspective of Valve Control [PDF]
EnergiesModular multilevel converter (MMC)-based HVDC systems have become one promising way to integrate a large amount of renewable energy. However, the high-frequency harmonics problem could seriously affect the safety and stable operation level of MMC-HVDCs ...
Qing Huai +5 more
doaj +2 more sources
High‐Frequency Wave Generation in Magnetotail Reconnection: Nonlinear Harmonics of Upper Hybrid Waves [PDF]
Geophysical Research Letters, 2019 MMS3 spacecraft passed the vicinity of the electron diffusion region of magnetotail reconnection on 3 July 2017, observing discrepancies between perpendicular electron bulk velocities and E→×B→ drift, and agyrotropic electron crescent distributions ...
Kyunghwan Dokgo +6 more
doaj +2 more sources
Accurate and Fast Parallelized Assessment of Waveform Distortions in Presence of Low and High frequency Spectral Components [PDF]
, 2022 The waveforms distortion assessment nowadays requires great research efforts due to the contemporaneous presence of low- and high-frequency harmonics and interharmonics (up to 150 kHz). In this paper, a new multi-method approach allowed accurate and fast
Varilone P. +5 more
core +1 more source
The relationship between bubble concentration and the acoustic emission energy of separate frequency bands [PDF]
JASA Express Letters, 2022 This letter presents the relationship between bubble concentration and the energy ratio of low to high frequency bands of their acoustic emissions. Two sensors, placed perpendicular and concentric to a transmitter, captured the emissions from sonicated ...
Krit Sujarittam, James J. Choi
doaj +1 more source
Applied Sciences, 2020 The current signal harmonic detection method(s) cannot reduce the errors in the analysis and extraction of mixed harmonics in the power grid. This paper designs a harmonic detection method based on discrete Fourier transform (DFT) and discrete wavelet ...
Guishuo Wang, Xiaoli Wang, Chen Zhao
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Induction Motor Direct Torque Control with Synchronous PWM
Energies, 2021 A novel induction motor direct torque control (DTC) algorithm with synchronous modulation is presented. Compared to the traditional DTC method, whose main drawback is the presence of low-frequency torque harmonics (sub-harmonics), in the proposed method,
Alessandro Benevieri +4 more
doaj +1 more source
Harmonics and Interharmonics Detection Based on Synchrosqueezing Adaptive S-Transform
Energies, 2022 The integration of renewable energy generation and nonlinear power electronic equipment into the grid brings about complex harmonics and interharmonics problems.
Zhaoyu Lou +3 more
doaj +1 more source
High-Frequency Behavior of Residual Current Devices [PDF]
, 2012 The purpose of this paper is to analyze the behavior of residual current devices at frequencies higher than the rated one. Many experiments are carried out by measuring tripping current and time of devices of different typology, produced by different ...
Freschi, Fabio
core +1 more source
IEEE Access, 2023 An improved modulation method is proposed for two parallel three-level interleaved rectifiers to reduce current harmonics and high-frequency zero-sequence circulating current, which uses sinusoidal pulse width modulation.
Yanfeng Li +3 more
doaj +1 more source
Household Appliance Classification Using Lower Odd-Numbered Harmonics and the Bagging Decision Tree
IEEE Access, 2020 Non-Intrusive Load Monitoring (NILM) systems have gained popularity in recent years for saving more energy. To reduce sensing infrastructure costs, NILM monitors the electrical loads based on a machine learning method.
Thi-Thu-Huong Le, Hyoeun Kang, Howon Kim
doaj +1 more source