DECENTRALIZED ADAPTIVE LOAD FREQUENCY CONTROL IN A MULTI-AREA POWER SYSTEM

摘要

The emergence of competitive forces in the electricity market and the demand for lower electricity rates will inevitably reduce the degree of co-operation between interconnected utilities. Therefore, the power system centralized control strategy leaves space to a decentralized one. But the main problem is that a decentralized strategy has to guarantee the whole dynamic security without the need of exchanging information or of coordination among areas. The paper deals with the investigation on the design of a decentralized load frequency control law able to allow the independent operation of each area, assuring in the same time the whole power system stability. Utilizing a decomposition-aggregation technique it is possible to handle the multi-area power system as composed by n subsystems (areas) interconnected each other. In particular, the aggregation stage is performed by the use of an adaptive optimal decentralized control law. In the paper, it is demonstrated that, using the proposed approach, the independence of each area is allowed and, in the same time, the stability and a good performance of the power system are guaranteed.