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Design of decentralised load-frequency regulators for interconnected power systems

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1 Author(s)
T. Hiyama ; Kumamoto University, Department of Electrical Engineering, Kumamoto, Japan

The paper presents a new method of designing decentralised load-frequency regulators for interconnected power systems. Within the framework of this method, the interconnected mutliarea power system is decomposed into several subsystems, each of which is controlled separately by a decentralised regulator. Each subsystem consists of one area and its external equivalent in a simplified form. A decentralised control law for the study area is introduced by using a quadratic performance index. Feedback gains of the decentralised regulator, which minimise the index, are determined by a Newton-Raphson iterative algorithm. The proposed method is applied to an interconnected longitudinal 4-area system, and the effects of the proposed regulator are examined by digital simulations and associated sensitivity analysis of the system. Furthermore, a suitable means for preventing excessive control action is also considered involving a significant system nonlinearity, i.e. some generation rate constraint.

Published in:

IEE Proceedings C - Generation, Transmission and Distribution  (Volume:129 ,  Issue: 1 )