Opportunities and challenges for voltage stability with power-electronics-interfaced components

The focus of this panel will be analyzing challenges and opportunities with power electronics interfaced components on the voltage stability of the transmission system. With recent wide-spread deployment of power electronics interfaced loads (PEIL), traditional aggregated PQ or ZIP load models are not any more suitable to model the voltage dependency of loads efficiently. Power electronic interfaced loads have piecewise linear behavior in terms of voltage dependency and with increasing PEIL penetration, the behavior of load at aggregated level in distribution system is affected. Piecewise linear models for electronic loads have been adopted generally for composite load models. This change in voltage dependent behavior of loads demands consideration of models that can more efficiently capture the characteristics of load at aggregated level. This panel will discuss: a) analyze the impact of power electronic loads on aggregated load model and T&D simulation, and b) information exchange between advanced distribution grid operators and transmission operators by representing distribution feeders as aggregated load within transmission systems and analyzing impact on the transmission system.