Power System Small Signal Stability Analysis and Control

Debasish Mondal, Abhijit Chakrabarti, Aparajita Sengupta

• Publisher: Academic Press
• Year: 2014
• Print ISBN: 9780128005729
• eBook ISBN: 9780128006702
• Topic: Tecnología e ingeniería
• Subtopic: Ingeniería eléctrica y telecomunicaciones

Power System Small Signal Stability Analysis and Control presents a detailed analysis of the problem of severe outages due to the sustained growth of small signal oscillations in modern interconnected power systems. The ever-expanding nature of power systems and the rapid upgrade to smart grid technologies call for the implementation of robust and optimal controls. Power systems that are forced to operate close to their stability limit have resulted in the use of control devices by utility companies to improve the performance of the transmission system against commonly occurring power system disturbances. This book demonstrates how the application of power system damping controllers such as Power System Stabilizers (PSSs) and Flexible Alternating Current Transmission System (FACTS) controllers—namely Static Var Compensator (SVC) and Thyristor Controlled Series Compensator (TCSC)—can guard against system disruptions. Power System Small Signal Stability Analysis and Control examines the signal stability problem, providing an overview and analysis of the concepts and of the controllers used to mitigate it. Detailed mathematical derivations, illustrated case studies, the application of soft computation techniques, designs of robust controllers, and end-of-chapter exercises make it a useful resource to researchers, practicing engineers, and post-graduates in electrical engineering. - Examines the power system small signal stability problem and various ways to mitigate it - Offers a new and simple method of finding the optimal location of PSS in a multi-machine power system - Provides relevant exercises to further illustrate chapter-specific content

Chapter 1

Concepts of Small-Signal Stability

Abstract

This chapter presents fundamental concepts of small-signal stability problem in power system. Different categories of power system oscillations and its study procedures are discussed. Swing equations and its detail dynamics related to the oscillations of synchronous machine are presented. Concepts of synchronizing torque and damping torque and their contribution on enhancing power system stability have been illustrated. The classical method of small-signal stability analysis has been explained through an example.

Keywords:

Damping torque

Inter-area mode

Local mode

Power system stability

Synchronous machine

Small-signal stability

Swing equations

Synchronizing torque

1.1 Introduction

Small-signal (or small disturbance) stability is the ability of the power system to maintain synchronism under small disturbances such as small variations in loads and generations. Physically power system stability can be broadly classified into two main categories – angle stability or rotor angle stability and voltage stability [1].

Angle stability or rotor angle stability can be defined as “the ability of interconnected synchronous machines of a power system to remain in synchronism.” This stability problem involves the study of electromechanical oscillations inherent in power systems. A fundamental issue here is the manner in which the power output of synchronous machines varies as their rotors oscillate.

Voltage stability can be broadly defined as “the ability of a system to maintain steady acceptable voltages at all buses following a system contingency or disturbance.” A system enters into a state of voltage instability when a disturbance, increase in load demand, or change in system condi...

Table of contents

• Cover image
• Title page
• Table of Contents
• Copyright
• Dedication
• Acknowledgments
• Author Biography
• Preface
• Chapter 1: Concepts of Small-Signal Stability
• Chapter 2: Fundamental Models of Synchronous Machine
• Chapter 3: Models of Power Network and Relevant Power Equipments
• Chapter 4: Small-Signal Stability Analysis in SMIB Power System
• Chapter 5: Small-Signal Stability Analysis in Multimachine System
• Chapter 6: Mitigation of Small-Signal Stability Problem Employing Power System Stabilizer
• Chapter 7: Application of FACTS Controller
• Chapter 8: Optimal and Robust Control
• Nomenclature
• Appendix A: Fundamental Concepts
• Appendix B: Data Used for Relevant Power System Components
• Index