Meet the editor

Kenneth Eloghene Okedu was a Massachusetts Institute of Technology (MIT) Research Fellow in the department of Electrical and Computer Engineering, 2013 at Cambridge, Boston, USA. He obtained his Ph.D. from the Department of Electrical and Electronic Engineering, Kitami Institute of Technology, Hokkaido, Japan in 2012. He received his B.Sc. and M. Eng. degrees in Electrical and Electronic Engineering from the University of Port

Harcourt, Nigeria in 2003 and 2007, respectively, where he was retained as a Faculty member from 2005 until the present day. He was also a visiting Faculty member to The Petroleum Institute, (ADNOAC), Abu Dhabi. He was also a visiting Faculty member to the Caledonian College of Engineering, Muscat, Oman (a university college with Glasgow Caledonian University, UK). He is presently a visiting Professor to the National University of Science and Technology (NUST), Muscat, Oman in the Department of Electrical and Computer Engineering. His research interests include power system stability, renewable energy systems, stabilization of wind farms using doubly fed induction generator variable speed wind turbine, augmentation and integration of renewable energy into power systems, grid frequency dynamics, wind energy penetration, FACTS devices and power electronics, renewable energy storage, hydrogen and fuel cells.

**Preface III**

Small Signal Stability and Dynamics **1**

**Chapter 1 3**

**Chapter 2 15**

**Chapter 3 33** Power System Small-Signal Stability as Affected by Grid-Connected SmartPark

Power Oscillations and Electrical Infrastructures **53**

**Chapter 4 55**

**Chapter 5 75**

Power Oscillation Due to Ferroresonance and Subsynchronous Resonance

Effects of Climate Change in Electric Power Infrastructures

Application of the Trajectory Sensitivity Theory to Small Signal Stability

*by Enrique Arnoldo Zamora Cárdenas, Alejandro Pizano Martínez* 

Introductory Chapter: Power System Stability

*by Kenneth Eloghene Okedu*

*and Claudio Rubén Fuerte Esquivel*

**Section 1**

Contents

Analysis

*by Cai Hui*

**Section 2**

*by Salman Rezaei*

*by Daniel Burillo*

## Contents


Preface

This book contains two sections: Section 1 'Power System Stability - Small Signal Stability and Dynamics' and Section 2 'Power System Stability - Power Oscillations and Electrical Infrastructures'. The book is relevant to academia and industries because it contains information from several authors with sound academic and

Section 1 *Power System Stability - Small Signal Stability and Dynamics* - This section has three chapters. Chapter 1 introduces the book by giving an overview of power systems and stability criteria. This chapter presents a brief overview of power system structure, power system components and power system stability based on the swing equation. Stability studies considering synchronous generator models are also discussed. Steady state small disturbances and transient stability studies are also covered. The equal area criterion could be used for a quick prediction of stability. In this chapter, the various scenarios for stability analysis in a power network considering the equal area criterion for sudden change of load, maximum power limit, three phase fault at the sending end and three phase fault away from the sending end are presented for a one machine connected system to an infinite bus. Chapter 2 describes the application of the trajectory sensitivity theory to small signal stability analysis. This chapter presents a practical approach for assessing the stability of power system equilibrium points in real time based on the concept of trajectory sensitivity theory. The Mexican power system was used as a case study to evaluate and demonstrate the approach in a general sense and also to show how power systems could be effectively operated and control, considering effective energy management systems. Complementary information to those given by selective modal analysis is also obtained using this approach in order to find how the state variables that are linked with critical eigenvalues are affected by the parameters of the system. Also, this chapter provides solutions for how to evaluate the oscillatory behavior of a power system based on the parameters of the system. In Chapter 3, power system small signal stability as affected by grid-connected Smart Park is investigated. In this chapter, Damping Torque Analysis (DTA) was employed to examine the effects of the integration of smart charging station on the dynamic stability of transmission system. A single-machine infinite bus power system with a smart charging station was used in this work as an aggregate of several charging stations. The results obtained from DTA, according to this chapter, show that the damping ratio and optimal charging capacity should be considered in the design of the smart charging station. This is because the power system that can achieve the best maintained dynamic stability and damping ratio would be able to reach the crest value. The chapter further proposes the Phillips-Heffron model to design the stabilizer through regulation of the active and reactive power of the smart charging station, considering phase compensation methods. The power oscillation in tieline can be suppressed more quickly and accurately with the help of the stabilizer,

industrial background in the field of power system technology.

damping of the system oscillation under certain operating conditions.

Section 2 *Power System Stability- Power Oscillations and Electrical Infrastructures* - This section has two chapters. Power oscillations due to ferroresonance and Sub Synchronous Resonance (SSR) is presented in Chapter 4. Ferroresonance and SSR
