Stability limits prediction by second order sensitivity based BCU method with structure preserving model

Nowadays, the transient energy function method for fast transient stability calculations to perform the dynamic security assessment of power systems is possible. This paper presents a second order sensitivity based BCU method with a network structure preserving model for power system transient stability analysis. The approach can obtain more accurate stability limits then when a linearized sensitivity expression and a simplified classical model are used. A detailed development of the analytical sensitivity procedure of the power system energy margin is presented. The technique is tested on the 6-machine 22-bus Chinese EPRI test system and the 16-machine 60-bus East China Reduced Network. A good assessment of these power systems´ stability limits is obtained