Robust H∞ load frequency control in interconnected power systems

This paper describes a robust load frequency control (LFC) scheme to design a centralized H^∞ controller for a two-area power system interconnected by a lossless tie line with uncertain disturbances. A sector-bounded H^∞ control approach is used for compensating of nonlinear power systems in LFC. The simulation results in time domain have verified the effectiveness of the proposed robust H^∞ controller to significantly reduce the area control error (ACE), frequency errors and tie-line power errors in the presences of external disturbance, parameter uncertainties and accidental crashing of generating units, which represents the structural or model uncertainties. Simulation results show that the proposed H^∞ controller guarantees robust performance and fast response under a wide range of operating conditions and system uncertainties.