Voltage Collapse Analysis in State Space for Power System of C-130 Aircraft

The effects of the generator excitation current limit، the on-load tap changer (OLTC) and load dynamics on voltage stability in C-130 aircraft power system are analyzed in state space. The variation of the number and coordinates of the equilibrium points with parameters of the system arc discussed. I n addition، a small-disturbance voltage stability region of a simple system is constructed. When the dynamic of voltage collapse is considered، it is more convenient to analyze it in the state space rather than in the input/output parameter space. The voltage stability of a system is determined by the dynamic characteristics of both the OLTC and the load. The generator excitation current limit affects the voltage stability by changing the small-disturbance voltage stability region and the equilibrium points of the system. After a small disturbance، the mode of voltage instability، fast instability or longer-term instability depends on the composition of the- load as well as the value of the system reactance.