Abstract: Voltage instability is a major threat for security of power systems. Preserving voltage security margin at a certain limit is a vital requirement for today’s power systems. Assessment of voltage security margin is a challenging task demanding sophisticated indices. In this paper, for the purpose of on line voltage security assessment a new index based on the correlation characteristic...

This paper presents the performance comparison of meta– heuristics algorithms such as DE (Differential Evolution), PSO (Particle Swarm Optimization) and GA (Genetic Algorithm for the problem of Transmission Power Loss (TPL) minimization using Flexible AC Transmission System (FACTS) devices. In addition to that a novel power flow method is proposed using Broyden – Shamanski method with Sherman –...

Increased electric power consumption causes transmission lines to be driven close to or even beyond their transfer capacities resulting in overloaded lines and congestions. Flexible AC Transmission Systems (FACTS) provide an opportunity to resolve congestions by controlling power flows and voltages. Main focus in this paper lies on the Thyristor Controlled Phase Shift Transformer (TCPST). IEEE ...

The present technological developments in power electronics industry increase the utilization of various types of Flexible AC Transmission Systems (FACTS) controllers. Depending on the type of converters connection, there are single and multi-line FACTS controllers. Based on the type of connection, amount of the compensation and the advantage of convertible static compensators (CSC), Generalize...

Received Jul 17, 2012 Revised Oct 26, 2012 Accepted Nov 2, 2012 Earlier, a simple dynamic equivalent for a power system external area containing a group of coherent generators was proposed in the literature. This equivalent is based on a new concept of decomposition of generators and a two-level generator aggregation. With the knowledge of only the passive network model of the external area and...

This paper presents a new centralized adaptive method under frequency load shedding. Sometimes, after initial frequency drop following severe disturbances, although the system frequency returns to its permissible value, however, the system might become unstable due to voltage problems. In this regard, the paper proposes a new centralized adaptive load shedding method to enhance the voltage stab...

The optimal placement of STATic synchronous COMpensator (STATCOM) for voltage stability improvement in power system is the important optimization problem. There are so many research works are carried out in the optimal placement of STATCOM to achieve the various objectives using Particle Swarm Optimization (PSO). In conventional optimization technique the weight-age of objective functions are c...

The 1149.1 TAP controller has proven to be an effective test interface for ICs on boards using its standard 4 pin interface (TCK, TMS, TDI, TDO). One of the most important features of the TAP is its Protocol, which provides an easy to follow Plug & Play IC test interface. This Protocol defines and enforces; (1) a Test Reset Mode, (2) a Run/Test Idle Mode, (3) an Instruction Scan Mode, and (4) a...

The main objective of this paper is to find the optimal location and control parameters settings of Unified Power Flow Controller (UPFC) with regard to power loss minimization. The proposed algorithm is based on steady state power injection model of UPFC. In this paper, two Evolutionary optimization techniques, namely Differential Evolution Algorithm (DE) and Genetic Algorithm (GA) are employed...