Control of interconnected power systems using two-level methods

This paper examines the application of a two-level control scheme for a two-area power system model with non-linear interaction between the area. The first level consists of independent local optimal controllers for the two areas which arc obtained by solving lower-order linear quadratic problems. The second level takes into account the system interactions between the areas using the method of interaction prediction. The two-level control scheme ensures that the performance of the overall power system is optimized. The results obtained using the interaction-prediction method are compared with those obtained by the method of intervention control. A two-area power system represented by a 9th-order non-linear state-space model is used to illustrate the relative merits of the interaction-prediction approach.