Results 21 to 30 of about 842,734 (293)
Harmonic voltage measurement error of the capacitor voltage transformer
PLOS ONE, 2018 This paper explores the mechanism for the harmonic voltage measurement error (HVME) of a capacitor voltage transformer (CVT) in a comprehensive way and develops a practical error correction method to improve the harmonic measurement performance of a CVT.
Jian Le, Hao Zhang, Chao Gao, Qian Zhou
openaire +4 more sources
Interleaved Pulse Width Modulation Based on Modified Carrier in Parallel Operation
IEEE Access, 2021 An interleaved pulse width modulation (PWM) can be employed in a parallel operation of three-phase converters because the interleaved PWM increases the equivalent switching frequency and significantly enhances the output current harmonics.
Hyun-Sam Jung
doaj +1 more source
Measuring Harmonics With Inductive Voltage Transformers in Presence of Subharmonics [PDF]
IEEE Transactions on Instrumentation and Measurement, 2021 The measurement of harmonics is one of the key tasks in modern power systems, performed basically for power quality assessment, verification of planning levels compliance, immunity and compatibility purposes, and so on. Especially at medium voltage (MV) and high voltage (HV) levels, harmonics are always measured through voltage and current transformers
Gabriella Crotti +3 more
openaire +4 more sources
Coordinated control for harmonic mitigation of parallel voltage-source inverters
CES Transactions on Electrical Machines and Systems, 2018 The increasing use of power electronic devices can deteriorate the power quality by introducing voltage and current harmonics. In islanded microgrids, the presence of nonlinear loads can distort the point of common coupling (PCC) voltage, while the dead ...
Yang Qi +3 more
doaj +1 more source
The Effects of Harmonics on Voltage Stability
IEEJ Transactions on Power and Energy, 2002 Demand for electrical energy has been increasing by the time as related to both technological developments and increase in population. It is necessary to enhance the quality of the electrical energy, especially supplied one. With considering voltage stability of power system, which includes nonlinear loads, during the planning, operating, and ...
Gülez, Kayhan +3 more
openaire +5 more sources
An improved digital phase locked loop against adverse grid conditions
Energy Reports, 2022 The phase-locked loop (PLL) is an essential synchronization technique to ensure stable operation and control of grid-connected converters. Nevertheless, under actual conditions, the grid voltage is often influenced by harmonics and frequency variation ...
Jiaqi Yu +5 more
doaj +1 more source
Fast-responding measurements of power system harmonics using discrete and fast fourier transforms with low spectral leakage [PDF]
, 2011 Conventional wisdom dictates that a Fast Fourier Transform (FFT) will be a more computationally effective method for measuring multiple harmonics than a Discrete Fourier Transform (DFT) approach.
Burt, Graeme M. +3 more
core +3 more sources
Harmonic analysis of AC-bus voltage in converter station based on time–frequency transformation
The Journal of Engineering, 2018 The disturbance of the AC system has become one of the main causes of commutation failure in the high voltage direct current (HVDC) transmission system. Here, the time–frequency transformation method is used to analyse the AC-bus voltage disturbance from
Zhao Dandan +6 more
doaj +1 more source
Energies, 2022 The advantages of three-level neutral-point-clamped (NPC) H-bridge inverters, such as simple topological structure, low device voltage stress, high equivalent switching frequency, and highly expansible capacity, have made them the preferred choice for ...
Wen-Jie Wu +3 more
doaj +1 more source
Design and implementation of a modified fourier analysis harmonic current computation technique for power active filters using DSPs [PDF]
, 2001 The design and implementation of a harmonic current computation technique based on a modified Fourier analysis, suitable for active power filters incorporating DSPs is presented.
El-Habrouk, M +3 more
core +1 more source