This paper describes the impact of operation of big customers on voltage quality parameters in medium voltage distribution grids. 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 was analysed.
The supply territory of the company E. ON Distribution in the Czech Republic (operated by the company E.ON Czech Republic) accounts for approximately 1.5 million customers, the most of them are connected to the low voltage (LV) distribution grid. The goal of this paper is to describe problems of voltage quality in the LV distribution grid, if exist. The survey is based on the evaluation of approximately 450 voltage quality (VQ) measurements which were made in points of LV grid with known short circuit impedance phase-earth. This short circuit impedance was measured in the each point of made VQ measurement. So it is possible to demonstrate the dependence of selected VQ parameters on phase-earth short circuit impedance by means of graphs.
Dispersed sources can cause significant voltage changes in the MV and LV distribution grids, which common voltage regulation of the grid by on-load tap changing of HV/MV power transformers can neither find nor respond to in an appropriate and effective way. In the proposed solution, stabilization of the voltage is preferably achieved by power factor or reactive power regulation (PF / Q) of connected sources. Voltage regulation of the power transformer operates when changing the voltage on the MV busbar in a substation, mostly when changing voltage in the 110 kV network. We consider this approach as a logical and appropriate to the nature of the rapid changes in power of wind and photovoltaic power plants.
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