What is it about?
Power system disturbances caused by load-fluctuations result in changes in tie-line real power and system frequency, necessitating some form of robust LFC for interconnected power systems. In this paper, a robust H∞ load frequency control approach is proposed for an interconnected two-area power system with the tie-line uncertain disturbances. This study describes a robust load-frequency control (LFC) scheme in a two-area interconnected power system with uncertain disturbances. A sector-bounded H∞ control approach is used for compensating of the nonlinearities based on a minimum order dynamic LFC model to avoid the complexity of a high-order model.
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Why is it important?
The simulation in time domain from the use of the proposed controller has been compared with the use of a conventional proportional–integral (PI) type controller affected by the same load change. The simulated results have proved the significant improvement over the PI controller and have verified the effectiveness of the proposed robust H∞ controller which can minimise the frequency deviations significantly. This approach treats the tie-line power exchanges in the presences of external disturbance, parameter uncertainties and accidental crashing of generating units as the structural or model uncertainties discussed in this study. Simulation results also show that the proposed H∞ controller guarantees robust performance and fast response under a wide range of operating conditions and system uncertainties.
Perspectives
The proposed robust H∞ controller based on a sector-bounded H∞ control theory has led to the development of design techniques which can result in significant improvement in LFC over the conventional PI control approach. A comparison is given for the frequency deviation and the power deviation by a step-load disturbance in simulation between the performance of the robust H∞ controller and a conventional PI type controller. Undoubtedly, this H∞ LFC approach is potentially capable to be extending for a n-area LFC case rather than the current focus.
Dr Ning Chuang
University of New South Wales
Read the Original
This page is a summary of: Robust H ∞ load-frequency control in interconnected power systems, IET Control Theory and Applications, January 2016, the Institution of Engineering and Technology (the IET),
DOI: 10.1049/iet-cta.2015.0412.
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