when power systems are expanded and connected together with weak tie lines, the low-frequency oscillations are increased and the stability margin of the power system decreases. therefore, when designing the transmission system to be used, it is necessary to maintain the dynamic stability of the power system, and to make sure to have the most possible stability margin. sssc is a facts device con...

Renewable energy provides twenty percent of electricity generation worldwide. Hydroelectric power is the cheapest way to generate electricity today. It is a renewable source of energy and provides almost one-fifth of electricity in the world. Also, it generates electricity using a renewable natural resource and accounting for six percent of worldwide energy supply or about fifteen percent of th...

This paper presents an Interior Pont Method (IPM) and Evolutionary Particle Swarm Optimization (EPSO) based hybrid method to solve optimal power flow in power system incorporating Flexible AC Transmission Systems (FACTS) such as Static Synchronous Series Compensator(SSSC) for security enhancement in the power systems. A fuzzy logic composite criteria based severity index is also used as an obje...

Unified power flow controller (UPFC) is one of the most important flexible AC transmission systems (FACTS) devices in power systems. It has many applications such as stability enhancement, power flow control, voltage support, etc. In this paper UPFC is used in order to control voltage. In this scope, UPFC is installed on a specified bus and the voltage of the proposed bus is controlled by using...

This paper presents the use of Flexible AC Transmission Systems (FACTS) for improving loadability of the system in deregulated electric power system.The optimallocation and parameter settingsof two types of FACTS devices have been investigated in this study. The Static Synchronous Series Compensator (SSSC) and Thyristor Controlled Series Compensation (TCSC) as two FACTS devices are considered i...

Considering aging power system infrastructures in conjunction with increased electricity trading activities, there is a strong need for future investments in electricity grids. Technological progress has made available a number of different investment alternatives, ranging e.g. from “standard” reinforcements of existing transmission capacities to the installation of Flexible AC Transmission Sys...

Abstract The extensive growth of large-scale flexible high voltage direct current (HVDC) transmission systems compromises the strength alternating (AC) power grid. Sub-synchronous oscillations will likely arise within such HVDC systems, which would significantly threaten grand electric system’s stable operation. A current-type enhanced virtual inertia control is proposed to suppress sub-synchro...

Flexible DC transmission systems experience negative damping characteristics in the high-frequency range due to delay system control link. This can lead interactions between impedance of modular multilevel converters (MMCs) and AC lines, resulting oscillation (HFO) issues. To resolve this problem, a simplified MMC model was developed, taking into account current inner loop The Sobol method empl...