Improved Load Frequency Control Using a Fast Acting Active Disturbance Rejection Controller

Md Rahman,Md Hossain,A Chowdhury

doi:10.3390/en10111718

Abstract

System frequency may change from defined values while transmitting power from one area to another in an interconnected power system due to various reasons such as load changes and faults. This frequency change causes a frequency error in the system. However, the system frequency should always be maintained close to the nominal value even in the presence of model uncertainties and physical constraints. This paper proposes an Active Disturbance Rejection Controller (ADRC)-based load frequency control (LFC) of an interconnected power system. The controller incorporates effects of generator inertia and generator electrical proximity to the point of disturbances. The proposed controller reduces the magnitude error of the area control error (ACE) of an interconnected power system compared to the standard controller. The simulation results verify the effectiveness of proposed ADRC in the application of LFC of an interconnected power system.

Highlights

Satisfactory operation of a power system involves both active and reactive power- balance between generation and load
The peak amplitude of area control error (ACE), frequency error and tie-line power flow error is considered as the output response in case of Active Disturbance Rejection Controller (ADRC)-based load frequency control (LFC)
Disturbances are canceled by ADRC and errors become zero

Summary

Introduction

Satisfactory operation of a power system involves both active and reactive power- balance between generation and load. These balances drive two equilibrium points: frequency and voltage. Stable operation of interconnected power system requires both acceptable frequency and tie-line power exchange [1]. Load frequency control (LFC), which is mainly used to maintain the standard frequency and the tie-line power exchange under schedule during any load changing event, can be defined as regulation of active power and frequency [2]. As the regulated output of the LFC, an area control error (ACE) that has a linear relationship between tie line power and frequency deviation is considered. LFC is responsible for controlling ACE zero and to do this, frequency and tie-line power errors need to be zeros

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Results

Conclusion