Stability analysis of integrated power system with pulse load

Abstract

The stability of an integrated power system (IPS) with pulse load involves both the trend of change in the system state during the whole period and the problem of whether to cause an unacceptable oscillation and an increase or decrease in the system state variable during a pulse period, which will pose a great challenge to the IPS. This paper considers the system stability in two aspects: the stability of system state variables in a periodic steady state under the action of pulse load, which refers to the stability of the periodic orbit, and the problem mentioned above, which cannot be described according to the stability of the equilibrium point and so needs further research. The analysis of the first aspect can lay the foundation for a study of the second aspect. This paper presents a mathematical model of the IPS with pulse load, uses the periodic-orbit method to analyze the system stability and stable margin and drives a state space averaging model of the system. For a relatively small state variable disturbance of the system under small signal disturbance, the state-space averaging method proves to be approximate to the periodic-orbit method. On this basis, the conventional state-space averaging method can be used for the analysis of system stability. The simulation and calculation show that the proposed method is feasible and effective.