Analysis of VQ parameters in delivery points of selected customers supplied from MV distribution grid
Management of Distribution Grid
The supply territory of the company E.ON Distribution in the Czech Republic (run by the company E.ON Czech Republic) accounts for approximately 1.5 million customers when ap-proximately 6000 customers are supplied from medium voltage (MV) level. Problems with flicker, voltage variations and harmonic voltage were detected in low voltage (LV) distribu-tion grids but the analysis from the MV level is not available. The electricity market liberalisation brings considerable pressure to introduce penalties for insufficient voltage quality (VQ) parameters. In case of poor voltage quality, these penalties should be of the electricity rebate payment nature. The analysis of VQ parameters in the distribution grid is necessary for definition of interface between the customer and distribution network operator (DNO) from view of responsibility for poor VQ. The MV voltage level is the level for connection of bigger customers to the distribution grid and it is necessary to know the conditions in it. This paper brings a detailed analysis of VQ parameters in this grid. The survey is based on the evaluation of 45 voltage quality measurements which were carried out in 15 different delivery points of other customers. These 45 measurements were made in years 2014, 2015 and 2016 (15 measurements a year) and were evaluated according to standard EN 50160. The impact on voltage variations and other voltage quality parameters were analysed.