Power system energy stability region based on dynamic damping theory

Concerning the difficulty in quantitatively describing the influence of different disturbances on power system stability, a novel composite energy stability region (ESR) is proposed in this study based on the dynamic damping theory. First, considering the influence of time-variant factors in the oscillation process on the dynamic characteristics of the system, the dynamic damping is energized. Thus power system dynamic stability criteria considering both the disturbance magnitude and system operation state is obtained. Then, the energy boundary of ESR is determined in the energy space according to the criteria, and the parameter boundary of ESR is determined in the parameter space combining the small signal stability region. On this basis, in the parameter-energy multi-dimensional space, the ESR which could reflect the dynamic stability and transient stability of power system under different disturbances is established. Finally, the ESR of IEEE 4-machine 11-bus system is drafted based on the dynamic damping theory. Simulation analysis of different parameter-energy pairs inside and outside the ESR verifies the correctness of the ESR drafted. The research in this study is of significant value in guiding system dispatch, predicting potential risks, formulating control strategies, and guaranteeing the safe and stable operation of power system.