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Drying Induction Motor Windings with Zero-Sequence Current
Russian Electrical Engineering, 2021A brief analysis of the main techniques of drying electric machine winding in an agricultural production environment is performed. An efficient drying technique is proposed in which these windings are hooked up to a feeding mains through capacitors, which allows creating a nonsymmetrical system of currents with a zero sequence that increases due to ...
Yu. Kh. Shogenov, A. Kh. Shogenov
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Zero-sequence Circulating Current Suppression Strategy for Microgrid Inverters
2021 IEEE International Conference on Mechatronics and Automation (ICMA), 2021The parallel connection of inverters in the microgrid system increases the system capacity, but also provides a basis for the generation of zero sequence circulating current (ZSCC). In order to solve the problems of system loss caused by ZSCC, an improved controller was designed.
Xuesong Zhou +3 more
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Design of Test System on Zero Sequence Current Transformers
2010 International Conference on Machine Vision and Human-machine Interface, 2010The zero sequence current transformer is one of the key component of permanent magnetism leakage circuit protection breaker and release relay. A C8051F120 microcontroller is used as the controller of performance test system of an intelligent zero sequence current transformers.
Da-neng Pi, Hai-zhou Gao
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A novel approach to eliminate zero-sequence harmonics current
APCCAS 2008 - 2008 IEEE Asia Pacific Conference on Circuits and Systems, 2008Zero-sequence harmonics caused by nonlinear loads usually result in high voltage distortion levels throughout the facility, neutral conductor overloading, motor heating, transformer heating, increased losses, and excessive harmonic injection onto the utility supply system. This paper presents a novel method to eliminate zero-sequence harmonics by using
null Qipeng Song +5 more
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Optimal Design of Flux Coupling Differential Zero-Sequence Current Transformer
2020 4th International Conference on Power and Energy Engineering (ICPEE), 2020With the operation of neutral point grounding syste m with small resistance, zero sequence current transformer ha s the problems of huge volume and insufficient accuracy in pra ctical engineering. Using flux constrained zero sequence curren t transformer can solve the problem of crossing three-phase ca ble and reduce the volume of equipment. At present,
Weining Wu +4 more
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IEEE Transactions on Energy Conversion, 2021
In the control of variable flux reluctance machine (VFRM) excited by zero-sequence current, neglecting the zero-sequence resistive voltage drop would cause a large calculation deviation of the stator voltage, which can saturate the inverter and influence the switching from constant torque region to flux-weakening region.
Jiaqiang Guo, Xu Liu, Shanhu Li
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In the control of variable flux reluctance machine (VFRM) excited by zero-sequence current, neglecting the zero-sequence resistive voltage drop would cause a large calculation deviation of the stator voltage, which can saturate the inverter and influence the switching from constant torque region to flux-weakening region.
Jiaqiang Guo, Xu Liu, Shanhu Li
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Performance improvement of brushless DC machine by zero-sequence current injection
IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society, 2015A novel current control strategy for Brushless DC machines (BLDCs) is presented in this paper. It aims to increase BLDC exploitation compared to conventional current commutation (two-phase-on) and three-phase-on control approaches. The proposed current control strategy consists in injecting a suitable zero-sequence current in order to exploit the BLDC ...
SERPI, ALESSANDRO +4 more
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The zero sequence circulating current suppression based on virtual impedance
2012 Power Engineering and Automation Conference, 2012There are zero sequence circuits, when inverters work in parallel directly, and zero sequence circulating current would flow, when zero sequence voltage of the inverter is different with that of the gird. The mechanism of the zero sequence circulating current is analyzed.
Xu Tieyan, Luo Yaohua
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Zero-sequence current blocking device for two phase AC systems
2019 54th International Universities Power Engineering Conference (UPEC), 2019Resonantly grounded power systems require fault current limitation in order to meet current standards and to ensure personal safety. A current limiting transformer (CLT), based on an isolating transformer, is investigated here. The major advantages of CLT, compared to an isolating transformer, are power derating, reduction of u k value and thus ...
Albert, Dennis +5 more
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