Results 21 to 30 of about 9,766 (262)
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
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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
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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
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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
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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
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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
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The HVDC commutation failure mechanism impacted by harmonics and its suppression method
Frontiers in Energy ResearchHarmonics are an important cause of voltage distortion, and voltage reduction and voltage distortion are the main causes of commutation failure. But most of the current research studies on commutation failure are based on the drop in fundamental voltage ...
Guojiang Zhang +4 more
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Power Quality Improvement Using Dynamic Voltage Restorer
IEEE Access, 2020 Power Quality is an essential concern in the modern power system that can affect consumers and utility. The integration of renewable energy sources, smart grid systems and extensive use of power electronics equipment caused myriad problems in the modern ...
Naeem Abas +4 more
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An MOA Deterioration Monitoring Method Based on an Improved HMM
Zhejiang dianli, 2022 In view of MOA （metal-oxide arrester） deterioration monitoring， a monitoring method based on an improved hidden Markov model （HMM） is proposed. An improved HMM model used for MOA deterioration monitoring is established by obtaining MOA leakage current ...
FANG Yiyue +4 more
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New Approach for Voltage Drop Estimation in the Busbars of Workshop Networks at Higher Current Harmonics Influence [PDF]
Problems of the Regional Energetics, 2019 The presence of higher current harmonics has a negative impact on the efficiency and reliability of the elements of network. Higher current harmonics can lead to significant increases of resistance, voltage drop and active losses in busbar, also to ...
Kotsur M.I. +3 more
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