Dynamic Vulnerability Assessment and Intelligent Control

Chapter 13Multi-Agent based Approach for Intelligent Control of Reactive Power Injection in Transmission Systems

Hoan Van Pham^1,2 and Sultan Nasiruddin Ahmed³

¹Power Generation Corporation 2, Vietnam Electricity

²School of Engineering and Technology, Tra Vinh University, Vietnam

³FGH GmbH, Aachen, Germany

13.1 Introduction

A power system is a highly dynamic system whose stability has to be ascertained in all cases; moreover, load centres expect a secure and reliable system. Voltage stability assessment is one of the major concerns in power system planning and secure operation as power grids span over several regions and sometimes even countries [1]. A direct link between the voltage and the reactive power makes it possible to control the voltage to desired values by control of the reactive power. The operator of the power system is responsible for controlling the transmission system voltage, which means having enough reactive power available to handle voltage violation conditions [2]. In normal conditions, the reactive power of the system not only dictates the voltage profile but also leads to losses. Loss minimization is an indispensable objective that must be considered in efficient power system operation [2–4]. Hence, to achieve certain global control objectives (e.g. N-1 secure operation, reactive power planning, minimization of losses, etc.) it is necessary to coordinate control actions among regional operators, but at the same time avoiding exposing local system data ...