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...

AC servo-driven precision transmission system is mainly composed of AC servo motor, mechanical transmission parts and control parts. Because of mutual coupling between various parts, particularly transmission system in mechanical coupling vibration in non-smooth transition, it will be of great harm to safe operation of the system. This paper made some overview and built the model of AC servo-dr...

The FACTS (Flexible AC Transmission Systems) devices have great use in the Electric Power System (EPS) for dynamic control of active and reactive powers system. This work deals with a comparative analysis between effects caused distance protection transmission lines (TLs) by two these devices: STATCOM (Static Synchronous Compensator) SSSC Series Compensator). objective is to verify how connecti...

Problem statement: Static Synchronous Compensator (STATCOM) and Static Synchronous Series Compensator (SSSC) have been individually applied to improve stability of power system. Approach: This study presents the coordination of a STATCOM and SSSC for improving power system stability. The swing curves of the three phase faulted power system with various cases are tested and compared. Results: Th...

Increasing demand for electricity has placed heavy stress on power system security. Therefore, this paper focuses on the problem of how to maximize power system static security in terms of branch loading and voltage level under normal operation and even the most critical single line contingency conditions. This paper proposes a hybrid approach to find out the optimal locations and settings of t...

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...

To meet the ever increasing load demands in a power system and to satisfy the stability and reliability criteria, the existing transmission lines have been forced to operate closer to their security limits. As a result, several voltage instability incidents have been reported all over the globe. One of the major being the voltage collapse problems in power systems which have been a permanent co...

Due to the rapid technological progress, the consumption of electric energy increases continuously. But the transmission systems are not extended to the same extent because building of new lines is difficult for environmental as well as political reasons. Hence, the systems are driven closer to their limits resulting in congestions and critical situations endangering the system security. Power ...