An adaptive controller for power system load-frequency control

Abstract

In this paper an adaptive controller is presented for load-frequency control of power systems. The new controller uses a PI adaptation to satisfy the hyperstability condition for taking care of the parameter charlges of the system. Only the available information of the states and output of the model as well as the plant output are required f.or the control. No explicit parameter identification is required. Furthermore, the proposed controller can be designed by using a reduced plant model to simplify the design without degrading much the performance. It follow9 that the new controller possesses a very attractive merit of being very easy to implement practically. The simulation results indicate that good control performance can be obtained by this proposed controller, and the performance is insensitive to the plant parameter changes. Moreover, the effectiveness of the proposed controller for considering the generation rate limit can also be confirmed.

Robust Decentralized Load Frequency Control Using Multi Variable QFT Method in Deregulated Power Systems

“…Viewing a multi-area power system under LFC as a decentralized control design for a multi-input multi-output system, it has been shown [8] that a group of local controllers with tuning parameters can guarantee the overall system stability and performance. The result reported in [4][5][6][7][8] demonstrates clearly the importance of robustness and stability issues in LFC design. In addition, several practical points have been addressed in [9][10][11][12][13][14] which include recent technology used by vertically integrated utilities, augmentation of filtered area control error with LFC schemes and hybrid LFC that encompasses an independent system operator and bilateral LFC.…”

“…Robust adaptive control schemes have been developed [4][5][6] to deal with changes in system parametric under LFC strategies. A different algorithm has been presented [7] to improve the performance of multi-area power systems. Viewing a multi-area power system under LFC as a decentralized control design for a multi-input multi-output system, it has been shown [8] that a group of local controllers with tuning parameters can guarantee the overall system stability and performance.…”

“…A well designed and operated power system should cope with changes in the load and with system disturbances, and it should provide acceptable high level of power quality while maintaining both voltage and frequency within tolerable limits [1][2][3][4][5] . Several strategies for Load Frequency Control of power systems have been proposed by researchers over the past decades [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] . This extensive research is due to fact that LFC constitutes an important function on power system operation where the main objective is to regulate the output power of each generator at prescribed levels while keeping the frequency fluctuations within pre-defined limits.…”

A Two-Layered Load and Frequency Controller of a Power System

“…Chan, 1982;Pan & Liaw, 1989;Kothari et al, 1989;Y. Wang et al, 1994;Indulkar & Raj, 1995;Karnavas & Papadopoulos, 2002;Moon et al, 2002;Sherbiny et al, 2003).…”

Optimal fuzzy load frequency controller with simultaneous auto-tuned membership functions and fuzzy control rules

“…During the past decades, several control approaches have been proposed and applied to the LFC design problem, including optimal control, adaptive control, model predictive control, sliding mode control, and robust control, which can be found in [2][3][4][5][6], respectively. Each of these techniques has its own advantages and disadvantages.…”