Abstract
The Flexible alternating current transmission systems (FACTS) is considered one of the most developed technologies applied for enhancing the performance of system due to their ability of adjusting different parameters in the transmission systems such as the buses voltage, the transmission line impedance, the active and reactive powers flow in transmission lines. The static synchronous series compensator (SSSC) is an effective member of the FACTS which is connected in series with the transmission lines and it consists of a solid-state voltage source inverter coupled with a transformer which aims to control and secure the operation of the power system. The main function of SSSC is inserting a controllable voltage in series with the transmission line to control the active and reactive powers flow in transmission lines. Solving the optimal reactive power dispatch (ORPD) problem is nonlinear, non-convex and it becomes a complex problem with integration of the SSSC. The contributions of article include, 1) an efficient and reliable optimization algorithm is developed to solve the ORPD problem and identify the optimal location and ratings of the SSSC, 2) The proposed algorithm is based on modifying the salp swarm algorithm (SSSA) using Levy Flight Distribution and spiral movement of particles to enhance the searching capabilities of the SSA, 3) an efficient model of SSSC based on power injection approach is used for representation the SSSC in ORPD. The ORPD is solved with and without the SSSC controller to minimize power losses and voltage deviations as well as improve the voltage stability. The proposed algorithm for ORPD is tested on the standards IEEE 30-bus and 57-bus systems. The simulation results demonstrate that MSSA is more effective and superior for solving the ORPD compared with some other reported meta-heuristic techniques. Moreover, the system performance is enhanced considerably with optimal inclusion the SSSC.
Highlights
The power losses obtained by modified Salp Swarm Optimization (MSSA) with optimal inclusion the Synchronous Series Compensator (SSSC) are reduced by 2.911% and 5.30% compared to the case where MSSA and salp swarm algorithm (SSA) are considered without inclusion the SSSC to the system
In application case of the MSSA for the IEEE 30-bus without SSSC, the power losses are reduced by 0.51%, the voltage deviations are reduced by 0.1553% and the voltage stability is enhanced by 2.2298% compared with application the SSA
In application case of the MSSA for the IEEE 30-bus with SSSC, the power losses are reduced by 3.3572%, the voltage deviations are reduced by 9.937% and the voltage stability is enhanced by 34.21% compared with solving optimal reactive power dispatch (ORPD) without SSSC
Summary
A. GENERAL In electric power system, the power flow intentions can be deliberated as fundamental of power scheme network calculations, since they are the most frequently accomplished program of power network designs which can be used in power scheme scheduling, operational forecasting, as well as operation/control. The optimal reactive power dispatch (ORPD) problem is a non-linear optimization problem related to optimal power flow. Solving the ORPD problem turns into a determined task in order to modify the power scheme for its secure and economical operation. The foremost aim to solve the ORPD problem is assigning the best operating set of control variables like voltages of the generators, transformer taps and the shunt compensator with satisfying operating constraints of the electric scheme [1]. Boosting voltage stability as well as minimizing power losses and voltage deviation minimization
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