TY - CONF

T1 - Load modelling influence on voltage stability assessment in distribution systems. Part I: Stability index and critical power for a single-line system

AU - Favuzza, Salvatore

AU - Mangione, Stefano

AU - Riva Sanseverino, Eleonora

AU - Dusonchet, Luigi

AU - Ippolito, Mariano Giuseppe

AU - Augugliaro, Antonino

PY - 2006

Y1 - 2006

N2 - The single-line equivalent model is commonly used forvoltage stability studies in both distribution andtransmission systems. Referring to a single-line system,in the companion paper [1] the authors presented thetheoretical aspects of voltage stability related to the loadcharacteristics. In particular, expressions of the stabilityindex for constant power, constant impedance andconstant current loads, singularly and in all the possiblecombinations have been obtained. This index indicateshow far the load node is from its voltage collapse point,allowing the maximum load power beyond whichvoltage collapse takes place to be evaluated. In thispaper a simple method to evaluate the parameters whichdefine the single-line equivalent system of a radialdistribution network is presented, allowing to extent toit the expressions of the stability index previouslyfound. Finally, the results of a detailed analysis of theinfluence of load models on the voltage stability of arealistic network, obtained with differentmethodologies, are reported for comparison anddiscussed.

AB - The single-line equivalent model is commonly used forvoltage stability studies in both distribution andtransmission systems. Referring to a single-line system,in the companion paper [1] the authors presented thetheoretical aspects of voltage stability related to the loadcharacteristics. In particular, expressions of the stabilityindex for constant power, constant impedance andconstant current loads, singularly and in all the possiblecombinations have been obtained. This index indicateshow far the load node is from its voltage collapse point,allowing the maximum load power beyond whichvoltage collapse takes place to be evaluated. In thispaper a simple method to evaluate the parameters whichdefine the single-line equivalent system of a radialdistribution network is presented, allowing to extent toit the expressions of the stability index previouslyfound. Finally, the results of a detailed analysis of theinfluence of load models on the voltage stability of arealistic network, obtained with differentmethodologies, are reported for comparison anddiscussed.

UR - http://hdl.handle.net/10447/4555

M3 - Other

SP - 1

EP - 6

ER -