Design of a reduced order observer for optimal decentralized control of HVDC systems

The authors present a novel approach to the design of decentralized optimal controls for integrated power systems. The approach involves the decomposition of the integrated system into interconnected subsystems and the independent control of each subsystem, considering the interactions at the interconnection points as unknown disturbances. The design of a reduced-order observer, capable of reconstructing the inaccessible states of the system and the unknown disturbances, and the integration of this observer into the overall control loop are presented. As an example, an optimal current regulator for HVDC system is presented to demonstrate the effectiveness of the proposed approach