Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : UPFC


Optimal Localization of UPFC For Transmission Line Losses Minimizing Using Particle Swarm Optimization

Ihssan A. Amin; Dhari Y. Mahmood; Ali H. Numan

Engineering and Technology Journal, 2021, Volume 39, Issue 10, Pages 1463-1472
DOI: 10.30684/etj.v39i10.1656

Losses in the transmission line have a significant and growing impact on power systems around the world. Line losses overheat power lines, therefore electrical power systems require powerful processors and intelligent management methods. Flexible AC Transmission System (FACTS) device UPFC is one of the most important devices due to its ability to reduce total line losses that cause an increase in the transmission line capacity of the power system. In this paper, we used Particle Swarm Optimization (PSO) to determine the optimal location for the installation of UPFC device to minimize losses in the transmission line in the Iraqi international grid (ING) 400kV using a proportional-integral (PI) based UPFC controller. The potential solutions of PSO are called particles. All the particles selected in this controller depend on their parameter only, which keeps feasible solutions in their memory. The algorithm is coded in MATLAB and it is incorporated with the conventional Newton Raphson’s load flow analysis. The result shows that the proposed optimization method applied for two UPFC compensator parameters in the power system contributed to minimizing the active and reactive power losses under normal operating conditions using a modified version of the PSO algorithm.

Stability Improvement Of the (400kV) Iraqi Grid using the best FACTS Devices

Rashid H. Al-Rubayi; Shaimaa Sh. Abd Alhalim

Engineering and Technology Journal, 2015, Volume 33, Issue 7, Pages 1598-1618

Electrical power system has become large and complicated, so it is subjected to sudden changes in load levels. Stability is an important concept which determines the stable operation of the power system.The modern trend is to employ by installing Flexible Alternating Current Transmission System (FACTS) devices in the system for effective utilization of transmission resources.The FACTS devices contribute to the power flow improvement besides, they extend their services in transient stability improvement as well, study and analyze the stability of the system through rotor angle and voltage .The object of this work is to improve the stability of the Iraqi National Super Grid System (INSGS) by using optimal FACTS devices in different optimal locations under fault conditions.Two test systems are studied, the first system is IEEE or WSCC (9-bus bars), and the second system is the Iraqi (400 KV) electrical network 24-bus bars.The load flow program was implemented using the Newton-Raphson method and the numerical solutions of non-linear differential equations are solved using Trapezoidal method.A comparison has been made between five types of FACTS (UPFC, SSSC, TCSC, SVC, STATCOM) at optimal location of the Iraqi grid and (9-bus bars) to get optimal FACTS devices by (voltage stability, rotor angle ).The results obtained showed that the installation of Unified Power Flow Controller (UPFC) is optimal devices for an improvement of the stability by damping the voltage and rotor angle oscillations.