DECENTRALIZED INTERACTION ESTIMATORS FOR LOAD FREQUENCY CONTROL IN MULTI-AREA POWER SYSTEMS USING MODEL REDUCTION TECHNIQUE

Mohammad H. Kazemi - Mehdi Karrari - Mohammad B. Menhaj

   Load Frequency Control (LFC) has received considerable attention during last decades. This paper proposes a new method for designing decentralized interaction estimators for interconnected large-scale systems and utilizes it to multi-area power systems. For each area, a local estimator is designed to estimate the interactions of this area using only the local output measurements. In fact, these interactions are the information of other area. In each local station the overall large-scale power system is split into two related subsystems: the i-th area and the residue system (aggregation of other areas), then a low order dynamic model, closed to the dynamics of the main system, is considered for the interaction estimator. Hankel-norm model reduction technique is used to construct an approximate model for the interaction dynamics provided that the residue system is stable. The proposed method is implemented to a three-area power system to illustrate the effectiveness of the proposed method.

Keywords: multi-area power systems

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