An Optimal Thevenin Equivalent Estimation Method and its Application to the Voltage Stability Analysis of a Wind Hub

Voltage stability assessment algorithm to predict power system loadability margin

“…Also, the performance of these methods during the transient periods (emerged just after disturbance occurrence) is not investigated properly. Although to accurately estimate E th and X th , some papers use data measured at the target bus as well as those buses connected to it [40], these methods have to access the communication network and cannot estimate Thevenin parameters using only locally measured data [30]. In addition, other research works (such as [41]), which improve the procedure for calculating Thevenin equivalent parameters using only local measurement, still neglect R th and hence, they cannot be used in sub-transmission and distribution systems with high R/X ratio [32][33][34][35][36][37].…”