Results 211 to 220 of about 47,412 (264)

Lessening zero sequence effects in dynamic voltage restorers

APCCAS 2008 - 2008 IEEE Asia Pacific Conference on Circuits and Systems, 2008
This paper puts forward an analysis of the effects of zero sequence components on power devices in particularly on the dynamic voltage restorer (DVR) and gives simulation results. It is shown that four-wire DVR do better then the traditional three-wire DVR, unbalance voltage and zero sequence components can be lessened by four-wire DVR effectively ...
Zhi Zhang, Zhongdong Yin, Changyin Zhang, Weidong Shang, Zhonghua Huang   +4 more
openaire   +1 more source

Managing zero sequence in voltage source converter

Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344), 2003
The 3-phase bridge voltage-source converter (VSC) which has been and continues to be the work-horse of variable-speed AC-motor drives is making penetration into the electric utility environment. In the electric utility environment, there is a greater emphasis on: (i) grounding and (ii) the need of the VSC to survive all conceivable faults.
null Lianxiang Tang, null Boon-Teck Ooi
openaire   +1 more source

Impact of zero sequence component on voltage-source converters

Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579), 2003
Presently, the preferred circuit of PWM (pulse width modulation) converters has the open-wye 3-phase connection, in which the zero sequence does not exist. Single-line-to-ground fault studies have shown that the grounded-wye connection is better from protection and security consideration.
null Lianxiang Tang, null Boon-Teck Ooi
openaire   +1 more source

Zero Sequence Voltage Control Enabling Transformerless Electric Vehicle Chargers

2021 IEEE Transportation Electrification Conference & Expo (ITEC), 2021
The transformer is one of the most bulky, expensive and lowest efficiency components in a typical electric vehicle charging system. Its removal is conducive to enabling greater proliferation of charging infrastructure and the adoption of electrified vehicles.
Michael Eull, Weizhong Wang, Liwei Zhou, Matthias Preindl   +3 more
openaire   +1 more source

Diagnostics of induction machines using the zero sequence voltage

Conference Record of the 2004 IEEE Industry Applications Conference, 2004. 39th IAS Annual Meeting., 2004
Diagnostics of induction machines using the zero sequence voltage is presented in this paper. Both stator-winding fault and broken rotor bar detection are covered. Faults in the stator windings or damaged rotor bar cause asymmetries in the phase impedances of the machine, which give rise to zero sequence voltage components.
P. Garcia, F. Briz, M.W. Degner, A.B. Diez   +3 more
openaire   +1 more source

Mitigating Zero Sequence Effects in Dynamic Voltage Restorers

2007 IEEE Power Electronics Specialists Conference, 2007
This paper presents an in-depth analysis of the effects of zero sequence components on series custom power devices in particularly on the dynamic voltage restorer (DVR). It is shown that the conventional three-wire DVR could not properly compensate for voltage sags containing a zero sequence component due to the lack of zero sequence current ...
D M Vilathgamuwa, H M Wijekoon
openaire   +1 more source

A novel technique for reducing leakage current by application of zero-sequence voltage

2014 International Power Electronics Conference (IPEC-Hiroshima 2014 - ECCE ASIA), 2014
This paper proposes a technique for reducing the leakage current flowing into a power source as a conducted noise. This leakage current may have an adverse effect on the peripheral equipment, e.g., causing malfunctions. The proposed technique requires us to add a zero-sequence voltage to the output voltage reference of the inverter.
Hideki Ayano, Kouhei Murakami, Yoshihiro Matsui   +2 more
openaire   +1 more source

Harmonic Analysis of Voltage Zero-Sequence-Based Encoderless Techniques

IEEE Transactions on Industry Applications, 2006
This paper exploits the interaction between the low-frequency and the high-frequency fields created by signal-injection techniques during sensorless estimation of the air-gap flux position in induction machines. Such an interaction causes new phenomena that can be summarized in a modulation of the machine saturation level and creation of harmonics that
CONSOLI A, SCARCELLA, Giuseppe, BOTTIGLIERI G, TESTA A.   +3 more
openaire   +1 more source

Measurement of zero-sequence voltage without galvanic coupling to the network

Russian Electrical Engineering, 2011
The possibility of the contactless extraction of the zero-sequence voltage for earth fault protection and control devices using the phenomenon of electrostatic induction is considered.
N. Sh. Shayakberov, F. S. Mingazov
openaire   +1 more source

Compensation of voltage sag and harmonics by dynamic voltage restorer without zero sequence blocking

2011 3rd International Conference on Electronics Computer Technology, 2011
Amic Voltage Restorer (DVR) is a power electronic device to protect sensitive loads from voltage sag. Commonly, sensitive loads are electronic-based devices which generate harmonics. This paper presents fuzzy polar based DVR as voltage sag restorer and harmonics compensator without zero sequence blocking.
D. Rajasekaran, S. S. Dash, M. Arun Bhaskar, C. Subramani, M. Jagadeesh Kumar, K Suresh Kumar   +5 more
openaire   +1 more source