Multi Area Load Frequency Regulation in Co-Ordination with HVDC Links: an ANN Tuned PID Controller Design

Karthikeyan, G.; Chandrasekar, S.
March 2012
International Review of Automatic Control;Mar2012, Vol. 5 Issue 2, p113
Academic Journal
The Load Frequency Control (LFC) problem has been a major subject in electrical power system operation and is becoming more significant recently with increasing size, changing structure and complexity in interconnected power systems. In this study, the power systems with three areas connected through HVDC and nominal AC tie-lines are considered. The perturbation of frequencies at the areas and resulting tie-line power flows arise due to unpredictable load variations that cause mismatch between the generated and demanded powers. The objective of LFC is to minimize the transient deviations and to provide zero steady state errors of these variables in a very short time. Variation in load frequency is an index for normal operation of power systems. When load Perturbation takes place anywhere in any area of the system, it will affect the frequency at other areas also. In practice LFC systems use simple Proportional Integral Derivative (PID) controllers, since the PID control parameters are usually tuned based on classical or trial- and - error approaches, they are incapable of obtaining good dynamic performance for a wide range of operations and various load changes scenarios in multi- area power systems. The simple neural networks can alleviate this difficulty. In this paper deals with various controllers like proportional integral (PI), PID and Artificial neural network (ANN) tuned PID controller for three area load frequency control. The performance of the PID type controller with fixed gain, Conventional integral controller (PI) and ANN based PID (ANN-PID) controller have been compared through MATLAB Simulation results. Comparison of performance responses of integral controller and PID controller show that the ANN- PID controller has quite satisfactory generalization capability, feasibility and reliability, as well as accuracy in three area system. The qualitative and quantitative comparisons have been carried out for Integral, PID and ANN- PID controllers. The superiority of the performance of ANN over integral and PID controller is highlighted


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