Title :
Influence of grid configuration on current conducting behaviour in PV installations
Author :
Debruyne, C. ; Verhelst, B. ; Desmet, J. ; Vandevelde, L.
Author_Institution :
Dept. Electr. Eng. - Lemcko, Howest, Kortrijk, Belgium
Abstract :
On the roof of an industrial site a 385 kWp PhotoVoltaic installation is operational. When production of this system reaches 60% of the installed power, the circuit breaker trips. At sufficient production, measurements show a high distortion of phase voltage and variable waveform of both phase voltage and current. Analysis of the installation showed that a Yy0 transformer is used introducing a high zero sequence impedance. Unbalance in the injected current combined with a high zero sequence impedance leads to a high neutral-ground voltage and distorted phase-neutral voltages. In this paper it will be shown that the tripping of the circuit breaker is caused by the measurement method of the device. This paper analyses the practical measurement results, causes of errors and the solution to the stated problem.
Keywords :
circuit breakers; electric current measurement; harmonic distortion; photovoltaic power systems; power grids; voltage measurement; waveform analysis; PV installations; Yy0 transformer; circuit breaker; current conducting behaviour; distorted phase-neutral voltages; grid configuration; neutral-ground voltage; phase current; phase voltage distortion; photovoltaic installation; power 385 kW; variable waveform; zero sequence impedance; Current measurement; Harmonic analysis; Impedance; Phase measurement; Pollution measurement; Production; Voltage measurement; Solar power; measurement method; transformer; tripping circuit breaker; zero sequence impedance;
Conference_Titel :
Environment and Electrical Engineering (EEEIC), 2011 10th International Conference on
Conference_Location :
Rome
Print_ISBN :
978-1-4244-8779-0
DOI :
10.1109/EEEIC.2011.5874607
