Steady‐State Voltage Stability Analysis

This chapter explains the fundamental aspects of steady‐state voltage stability analysis and describes the stiff‐source‐to‐load system to develop the power‐voltage (PV) curve. It describes the salient features of two voltage stability incidents, each resulting in wide‐spread blackout. The chapter analyzes reactive power required for power transmission on AC lines using distributed parameter line models. It discusses the voltage stability analysis of a stiff voltage source supplying a load using a PV curve. The chapter also discusses the voltage stability analysis for large power systems and methods for solving the power flow at the voltage collapse point. It considers dynamic voltage regulation and also describes several additional methods for assessing voltage stability. The chapter discusses the power flow solution and stresses the importance of having the proper system voltage to support active power transfer. It also describes a power flow method to directly eliminate the singularity of the Jacobian matrix.