Voltage Stability of Power System of the Slovak Republic: Influence of Transformers with AVR

The article deals with voltage stability of the power system (PS) and its assessment based on PV curves. We introduce an analysis of the influence of transformers with automatic voltage regulator (AVR) on the shape of PV curves and magnitude of voltage on the side of transmission system (TS) and distribution system (DS). The article was carried out in cooperation with the Slovak TSO – Slovenská elektrizačná prenosová sústava, a.s.