Neutral point potential variation from the low voltage distribution electricity grids

2016 ◽  
Author(s):  
Radu Porumb ◽  
Paul-Mihai Mircea ◽  
Cornel Toader ◽  
Georgiana Buica ◽  
Constantin Beiu ◽  
...  
Keyword(s):  
Low Voltage ◽  
Neutral Point ◽  
Voltage Distribution ◽  
Potential Variation ◽  
Point Potential ◽  
Electricity Grids

scholarly journals Extended T-type Inverter

2018 ◽  
Vol 3 (1) ◽  
pp. 55-64
Author(s):  
Jacek Rąbkowski ◽  
Rafał Kopacz
Keyword(s):  
Low Voltage ◽  
Field Effect Transistors ◽  
Schottky Diodes ◽  
Input Voltage ◽  
Neutral Point ◽  
Oxide Semiconductor ◽  
Laboratory Model ◽  
Power Losses ◽  
Power Semiconductor ◽  
Point Potential

Abstract This paper presents a new concept for a power electronic converter - the extended T-type (eT) inverter, which is a combination of a three-phase inverter and a three-level direct current (dc)/dc converter. The novel converter shows better performance than a comparable system composed of two converters: a T-type inverter and a boost converter. At first, the three-level dc/dc converter is able to boost the input voltage but also affects the neutral point potential. The operation principles of the eT inverter are explained and a simulation study of the SiC-based 6 kVA system is presented in this paper. Presented results show a serious reduction of the DC-link capacitors and the input inductor. Furthermore, suitable SiC power semiconductor devices are selected and power losses are estimated using Saber software in reference to a comparative T-type inverter. According to the simulations, the 50 kHz/6 kVA inverter feed from the low voltage (250 V) shows <2.5% of power losses in the suggested SiC metal oxide-semiconductor field-effect transistors (MOSFETs) and Schottky diodes. Finally, a 6 kVA laboratory model was designed, built and tested. Conducted measurements show that despite low capacitance (2 × 30 μF/450 V), the neutral point potential is balanced, and the observed efficiency of the inverter is around 96%.

New Detection Method for an Insulation Level Monitoring Device Used in Low-Voltage Distribution Lines

2016 ◽  
Vol 136 (11) ◽  
pp. 878-883 ◽  
Author(s):  
Kazunori Nishimura ◽  
Yusaku Marui ◽  
Satonori Nishimura ◽  
Wataru Sunayama
Keyword(s):  
Detection Method ◽  
Low Voltage ◽  
Monitoring Device ◽  
Voltage Distribution ◽  
Distribution Lines ◽  
Level Monitoring

Development and Evaluation of a Fast Voltage Calculation Method for Low-Voltage Distribution System

2013 ◽  
Vol 133 (4) ◽  
pp. 343-349
Author(s):  
Shunsuke Kawano ◽  
Yasuhiro Hayashi ◽  
Nobuhiko Itaya ◽  
Tomihiro Takano ◽  
Tetsufumi Ono
Keyword(s):  
Calculation Method ◽  
Distribution System ◽  
Low Voltage ◽  
Voltage Distribution
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