Study on the key buses to Power System Steady-state Voltage Stability

Abstract

With the method of modal analysis, the full Jacobian according to the power system power flow equations is studied and a method to identify the suitable bus for loading shedding is proposed in this paper. The proposed method makes use of the participation factors corresponding to the active power, by which the structural characteristic of the power system nonlinearity is included. As a result, the effective bus where the load shedding should be used can be found. In order to show the effectiveness of the proposed method, the WSCC 9-bus power system is used as an example. The simulation results indicate that with the load shedding at the place where the proposed method decided, the voltage stability indices are considerably increased. The proposed method in this paper is effective.

Assessment of power system security using Security Information Index

“…Model analysis has been adopted to study the power flow equations in [4]. Jacobian indices are proposed in [5] which include ratios of various norms and ratios of weighted singular values. Tie‐flow deviation index and the rate of change of frequency (Rocof) index are introduced for a security‐constrained multi‐objective framework with the unit commitment for day‐ahead joint market‐clearing in multi‐area electricity markets [6].…”