Power systems are complex, and power demand has constantly increased over time. Moreover, power transmission systems have a limited capacity, causing the increase in demand to be difficult to accommodate. Additional system requirements include maintaining voltages within specific values and limiting voltage drop in the lines to ensure voltage stability, which further limits power flow through the lines. Flexible Alternating Current Transmission Systems (FACTS) devices can be used to manage those limitations. They improve the voltage profile at system buses and control power flow in transmission lines. For optimal operation, the location and size of FACTS devices should be properly chosen. Since these devices are relatively expensive, the number of devices that can be connected to the system is limited. The proposed study analyzes the IEEE 14‐bus system. It utilizes the Static Synchronous Compensator (STATCOM) to enhance the voltage profile at the buses and the Static Synchronous Series Compensator (SSSC) to control the power flow on transmission lines. Optimal sizing of these devices considers voltage improvement, transmission line loadability, and cost by defining a multi‐objective function considering multiple parameters. Genetic algorithm (GA) is applied to find the optimum solution for the objective functions, including optimal selection of size and location.
Yassin et al. (Thu,) studied this question.