Fuzzy-based Load Frequency Controller of a Single Area Power System Considering Governor Nonlinearity

This paper presents the implementation of fuzzy based load frequency controller (FLFC) for controlling the frequency of an automatic generation control (AGC) in electric power generation systems. A typical single area power system is considered with governor dead-band. As a consequence of continually load variation, the frequency of the power system changes over time. In conventional studies, frequency transients are minimized by using conventional proportional integral (PI) controllers aiming of secondary control in AGC and zero steady-state error is obtained after sufficient delay time. In this paper, instead of this method, the configurations of fuzzy load frequency controller (FLFC) is proposed. For any load changes, the proposed controller restores the frequency to its nominal value within the shortest possible time. This controller provides a satisfactory balance between frequency overshoot and transient oscillations with zero steady-state error. All simulation results of the proposed controller are compared with conventional PI controller in both cases with and without governor dead-band.

[1]  C. Concordia,et al.  Efect of Speed-Governor Dead Band on Tie-Line Power and Frequency Control Performance , 1957, Transactions of the American Institute of Electrical Engineers. Part III: Power Apparatus and Systems.

[2]  T. S. Bhatti,et al.  Sampled Data Automatic Generation Control Analysis with Reheat Steam Turbines and Governor Dead-Band Effects , 1984, IEEE Power Engineering Review.

[3]  Shengwei Mei,et al.  Optimal load-frequency control in restructured power systems , 2003 .

[4]  Dragoslav D. Šiljak,et al.  Nonlinear systems;: The parameter analysis and design , 1968 .

[5]  Yannis L. Karnavas,et al.  AGC for autonomous power system using combined intelligent techniques , 2002 .

[6]  M. Enns,et al.  Electric energy systems theory , 1972 .

[7]  M. G. Rabbani,et al.  Effect of SMES unit on AGC dynamics , 1998, Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137).

[8]  Om P. Malik,et al.  Automatic generation control of interconnected power systems using variable-structure controllers , 1983 .

[9]  H. Shayeghi,et al.  Multi-stage fuzzy PID power system automatic generation controller in deregulated environments , 2006 .

[10]  L. K. Kirchmayer,et al.  Economic control of interconnected systems , 1959 .

[11]  Hadi Saadat,et al.  Power System Analysis , 1998 .

[12]  Mohammad Bagher Menhaj,et al.  Decentralized robust adaptive-output feedback controller for power system load frequency control , 2002 .