ROBUST DECENTRALIZED LOAD FREQUENCY REGULATOR FOR INTERCONNECTED POWER SYSTEMS.

A new method is presented for designing robust decentralized load-frequency control for large interconnected power systems. Within the framework of this method, the interconnected multiarea power system is developed by using, for each subsystem, a low-order model for the interaction between subsystems. The output of the interaction model is improved online using a model-following technique, and no information transfer between the subsystems is necessary. The controller gains are calculated once and are easy to compute. The proposed controller is tested on a two-area interconnection power system. The system is decomposed such that the first subsystem consists of its own state variables and the tie-line power variation, while the second subsystem consists of its own state variables only. The choice of the interaction model is scrutinized and several alternatives are considered. The performance of the proposed controller is compared to that of a centralized controller using full-state feedback strategy.