Print ISSN: 1813-0526

Online ISSN: 2220-1270

Main Subjects : Electrical Engineering

Robust Power System Stabilizer Design Based on H∞/μ

Firas Ahmed Aldurze

Al-Rafidain Engineering Journal (AREJ), 2020, Volume 25, Issue 2, Pages 30-36
DOI: 10.33899/rengj.2020.127577.1045

In this article,  H∞ /μ controller is relied on to control the power system stabilizer(PSS) using state space approach for a single machine infinite bus (SMIB) system. Design a robust feedback controller for the system using the H∞/μ technology supported by the Matlab / Simulink. The H∞/μ design method leads to a robust controller with a fixed structure and fixed parameters. The uncertainties of the model are taken into account when specifying the weights. The controller demeanor obtained was analyzed through the input represented by the step response and the output response of the power system (PS) in the case of normal operation and then the system with changed parameters. The suggested controller proved its effectiveness by maintaining the stability of the system with acceptable limits of disturbances.

A Survey Paper on Six Phase Induction Motor Drive

Myasar Salim Alattar; Ahmed Nasser B. Alsammak

Al-Rafidain Engineering Journal (AREJ), 2020, Volume 25, Issue 1, Pages 24-31
DOI: 10.33899/rengj.2020.126535.1009

This paper introduces different topics about six phase induction motor drives. It describes a different methods used for analyzing and representing induction motor model, by using (d-q-o) modelling and (x-y-o) some papers discussed motor model and its characteristics, controlling speed of motor and efficiency improvement. some techniques of control strategy such as (direct torque control, field oriented control, indirect field oriented control and sliding mode control etc. will be present to improve motor well this paper will present some techniques for voltage generation used to drive motors, some methods are implemented for this purpose depending upon quasi voltage generation, pulse width modulation, and space vector pulse width modulations etc are also discussed.

A Comparison Study of the Most Important Types of the Flexible Alternating Current Transmission Systems(FACTs)

Hasan A. Adnan; Ahmaed N. Alsammak

Al-Rafidain Engineering Journal (AREJ), 2020, Volume 25, Issue 1, Pages 49-55
DOI: 10.33899/rengj.2020.126854.1027

The Flexible Alternating Current Transmission systems(FACTs) devices is power electronics constructed system used to increase the capability of the transmission line. It has several types with different functions for example: SVC, STATCOM,DSTATCOM, TCSC, SSSC, IPFC and UPFC. The Static Synchronous Series Compensator (SSSC) used to control the active power of the transmission line by injecting controllable ac voltage in the series with the transmission line. The Static Synchronous Compensator (STATCOM) employed to control the reactive power by injecting adjustable ac current in the transmission line. The Unified Power Flow Controller (UPFC) consists of SSSC and STATCOM linked by DC capacitor, it controls both active and reactive power flow of the line. This paper presents a simulation study to compare between SSSC, STATCOM and UPFC by inserting each device separately on a 100 MVA, 500 KV, four busses power system. Each converter is designed by 48-pulse multilevel inverter to reduce harmonics contents of the line voltage. This study has been done using MATLAB / SIMULINK package.