COMPUTER BASED ANALYSIS OF ELECTRICAL POWER SYSTEM FOR THE PURPOSE OF STABILITY STUDIES

COMPUTER BASED ANALYSIS OF ELECTRICAL POWER SYSTEM FOR THE PURPOSE OF STABILITY STUDIES

ABSTRACT

This report examines the stability of the electrical power system. The ability of an electric power system to reestablish the initial state (or one nearly identical) after any disturbance manifested as a deviation from the system’s initial parameter values. A power system’s electric power sources are typically synchronous generators that are linked together by a common electric network in such a way that the rotors of all generators rotate in unison. This mode, known as the normal or steady-state mode, should be stable; that is, after a deviation from the steady-state mode, the power system should return to the initial state (or one nearly identical).

CHAPTER ONE

INTRODUCTION

•          Background of Study

In the early years following the introduction of digital computers, electric power system analysis software was run on mainframe computers.

Although there are many software applications on the market today that perform electric power system analysis on PCs, the majority are designed for professionals. These programs take detailed input data about the system, perform solutions using fast algorithms, and then present the results. Such software is most useful when the user only needs the final results.

The solution of problems in textbooks is a problem for students studying electric power systems. In the case of load flow problems, the majority of the effort is devoted to iterative calculation rather than problem resolution. The same can be said for stability studies.

Professional software for analyzing electric power systems can assist such students in proving their solution; however, only the final result’s validity can be checked.

Transient stability is a quick phenomenon that usually occurs within 1 second for a generation close to the source of the disturbance. The time domain simulation method is the most commonly used method for determining transient stability by solving a set of nonlinear equations describing the system dynamic equation. The inspection of the solution can reveal whether the system is stable or unstable.

1.2 THE SCOPE OF THE PROJECT

We, the students, should be able to understand the operation and working rules of a computer-based analysis for the purpose of stability studies after completing this project. How it was created, the interface with Java language for efficient and accurate output results, and its application in the field of electrical power systems.

1.3 OBLIGATION OF THE PROJECT

The requirement and goals of this project work are to create a java language program that can be used in a computer-based analysis of an electrical power system for stability studies.

1.4 SIGNIFICANCE OF THE PROJECT

Java is extremely important in today’s IT sector because it is platform independent, which means that a program written in the java language can run on any platform, machine architecture, or operating system, saving you time by not having to modify the code on every machine you use. Java is also one of the most popular programming languages for developing web applications and platforms. It was created to be adaptable, allowing developers to write code that could run on any machine, regardless of architecture or platform.

1.5 CONCEPT OF POWER SYSTEM STABILITY

1.5.1 Power System Stability Definition

Power system stability is defined as the power system’s ability to return to a steady state without losing synchronism. Power is produced by synchronous generators that run in tandem with the rest of the system. When a generator and a bus have the same frequency, voltage, and phase sequence, they are said to be synchronized.

1.6 Power System Stability Classification

1.6.1 Consistent State Stability

These studies are limited to small and gradual changes in the operating conditions of the system. In this case, we primarily focus on keeping the bus voltages close to their normal values. We also ensure that phase angles between two buses are not too large and check for the overloading of the power equipment, and transmission lines.

Power flow studies are commonly used for these checks (CIGRE Report, 2011).

1.6.2 Stability in the Short Term

According to (IEEE, 2012), this entails investigating the power system after a major disturbance. The synchronous alternator’s machine power (load) angle changes after a large disturbance due to sudden acceleration of the rotor shaft. The goal of transient stability is to determine whether the load angle returns to a steady state value after the disturbance has been cleared.

1.6.3 Stability in Motion

This is a power system’s ability to maintain stability in the face of constant small disturbances. This minor disruption is caused by random fluctuations in load and generation levels. These random variations can cause catastrophic failure in an interconnected power system because they can force the rotor.