Transient Stability Analysis of the IEEE 9-Bus Electric Power System

Abstract: 



It is widely accepted that transient stability is an important aspect in designing and upgrading electric power system. This paper covers the modelling and the transient stability analysis of the IEEE 9 bus test system using ETAP. In this, for various faults on the test system  fast fault clearing  and load  shed are analysed to bring back the system to the stability. Frequency is a reliable indicator if deficiency condition in the power system exists or not. Change in power demand or in production causes a fluctuation of the speed of the turbine-generator condition exists on the power system, resulting in fluctuation of the frequency of the power system. So rate of change of frequency is used as indicator of the transient stability of the system and to calculate the amount of load to be shed by adaptive load shedding and measures taken to maintain stability and frequency of the system. 

MODELING AND SIMULATION OF A SPEED SENSOR LESS VECTOR CONTROLLED INDUCTION MOTOR DRIVE SYSTEM

ABSTRACT

The paper describes direct vector control with stator flux orientation for controlling the speed a PWM inverter induction motor drive system without speed sensor. Modeling and simulation results of the drive system are presented with some practical results. The proposed control method assures good dynamic response of the system.

Direct Torque Control of Permanent Magnet Synchronous Motors – An Overview

Abstract—

In high-performance servo applications a rapid and accurate torque control is desired, preferably without the use of a motion-state sensor. The use of permanent magnet synchronous motors (PMSMs) combined with the direct torque control (DTC) scheme offers many opportunities to achieve this goal. Recently several authors have proposed possible implementations of direct torque control for permanent magnet synchronous motors. In this paper an overview is given. The basic principles of DTC for PMSMs are explained. Topologies and algorithms described in the literature for interior PMSMs as well as surface mounted PMSMs are discussed. Estimations of stator flux linkage and initial rotor position are needed in these control schemes. Techniques to achieve these estimations are discussed in this paper as well. The main goal of the paper is to give an outline of what is already achieved and to determine points of interest for further research.