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Multi Area Load Frequency Controller

version 1.0.1 (133 KB) by INDRANIL SAAKI
Indranil Saaki


Updated 13 Mar 2020

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A proportional–integral–derivative controller (PID) Load frequency controller is a generic control loop feedback mechanism (controller) widely used in industrial control systems. Frequency is a major stability criterion for large-scale stability in multi area power systems. To provide the stability, active power balance and constant frequency are required. Frequency depends on active power balance. To improve the stability of the power networks, it is necessary to design a load frequency control (LFC) systems that control the power generation and active power at tie lines. The tie lines are utilities for contracted energy exchange between areas and provide inter-area support in abnormal conditions. Area load changes and abnormal conditions lead to mismatches in frequency and scheduled power interchanges between areas. These mismatches have to be corrected by LFC, which is defined as the regulation of the power output of generators within a prescribed area. Therefore, the LFC task is very important in interconnected power systems.For large scale power systems which normally consist of interconnected control areas, Load Frequency Control (LFC) is important to keep the system frequency and the inter area tie power as near to the scheduled values as possible. The input mechanical power to the generators is used to control the frequency of the output electrical power and to maintain the power exchange between the areas as scheduled. A well designed and operated power system should cope with changes in the load and with system disturbances, and it should provide acceptably high level of power quality while maintaining both voltage and frequency within tolerable limits.
This project explains a unified PID tuning method for load frequency control (LFC) of power systems. The tuning method is based on the two-degree-of-freedom (TDF) internal model control (IMC) design method and a PID approximation procedure. The time-domain performance and robustness of the resulting PID controller is related to two tuning parameters. This project also explains the robust tuning of the two parameters. The method is applicable to power systems with non-reheated, reheated, and hydro turbines. Simulation results show that it can indeed improve the damping of the power systems. In this project it is also evident that the method can also be used in decentralized PID tuning for multi-area power systems.

Cite As

INDRANIL SAAKI (2020). Multi Area Load Frequency Controller (, MATLAB Central File Exchange. Retrieved .

Comments and Ratings (7)

Varun Rai

can you send me the iTAE function code of two area laod frequency control? Actually, i am unable to create ITAE function in matlab because i have to put the value of delF1,delF2 and delPtie from simulink model. Can you pls provide me this at
thank you


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rucha k

can u design a statcom using pi and svpwm for power oscillation damping

sir i m working on voltage and frequency control of wind and hydro.
please help me

Sir iam working on multiple area load frequency including thermal hydal and geothermal Can you help out with pid constants?



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MATLAB Release Compatibility
Created with R2009b
Compatible with any release
Platform Compatibility
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