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Zero Sequence Voltage Control Enabling Transformerless Electric Vehicle Chargers
2021 IEEE Transportation Electrification Conference & Expo (ITEC), 2021The 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 +3 more
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Impact of zero sequence component on voltage-source converters
Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579), 2003Presently, 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
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Diagnostics of induction machines using the zero sequence voltage
Conference Record of the 2004 IEEE Industry Applications Conference, 2004. 39th IAS Annual Meeting., 2004Diagnostics 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 +3 more
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IEEE Journal of Emerging and Selected Topics in Power Electronics, 2021
This article introduces a capacitor-voltage-balancing method based on optimal zero-sequence voltage injection in a stacked multicell converter (SMC). The proposed method is implemented using hybrid carrier pulsewidth modulation and is capable of balancing and regulating the voltages of dc-link capacitors and floating capacitors in the topology.
Qian Cheng, Chenchen Wang, Zhuo Chen
exaly +2 more sources
This article introduces a capacitor-voltage-balancing method based on optimal zero-sequence voltage injection in a stacked multicell converter (SMC). The proposed method is implemented using hybrid carrier pulsewidth modulation and is capable of balancing and regulating the voltages of dc-link capacitors and floating capacitors in the topology.
Qian Cheng, Chenchen Wang, Zhuo Chen
exaly +2 more sources
Mitigating Zero Sequence Effects in Dynamic Voltage Restorers
2007 IEEE Power Electronics Specialists Conference, 2007This 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
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On-Site Low Voltage Determination of Zero-Sequence Impedances for Power Transformers
IEEE Transactions on Power Delivery, 2020Accurate zero-sequence transformer data is important for correct fault analysis and protection settings. Utilities have been forced to approximate zero-sequence impedances for many three-legged core power transformers in service today that did not undergo testing for zero-sequence data at the factory before site installation. Where approximation of the
Haytham Saeed +2 more
exaly +2 more sources
A novel technique for reducing leakage current by application of zero-sequence voltage
2014 International Power Electronics Conference (IPEC-Hiroshima 2014 - ECCE ASIA), 2014This 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 +2 more
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Harmonic Analysis of Voltage Zero-Sequence-Based Encoderless Techniques
IEEE Transactions on Industry Applications, 2006This 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 +3 more
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Measurement of zero-sequence voltage without galvanic coupling to the network
Russian Electrical Engineering, 2011The 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
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Compensation of voltage sag and harmonics by dynamic voltage restorer without zero sequence blocking
2011 3rd International Conference on Electronics Computer Technology, 2011Amic 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 +5 more
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