A systematic procedure for developing the unified signal flow graph model of a fuzzy PI controller is presented in this paper. From this unified model it is possible to determine the complete behavior of the Fuzzy PI controller. As a first step in constructing the signal flow graph the analytical structures oflinear fuzzy PI controller are needed. In view of this by considering triangular/trape...

The electricity demand is continuously increasing, so a most efficient use of the current power system's capacity desired. Flexible AC Transmission Systems (FACTSs), recently developed transmission technology, are widely used to boost transfer ability long-distance line networks and enhance consistency systems. FACTS devices can lead reduced flows on heavily loaded lines, targeted bus voltage l...

The energy exchange between series and shunt converters is the basis for powerful functioning of unified distributed power flow controller, which can be realized through 3rd harmonic current. In this paper, based on established equivalent network controller system, influence additional loss caused by current line transmission capacity analysed. mathematical relationship neutral point voltage tr...

In power networks, operation planning has become necessary due to the continuously increased load demand. The Unified Power Flow Controller (UPFC) controls flow through network and improves dynamics of system. this paper, design application coordination a fuzzy-based UPFC with hybrid energy storage been proposed enrich system's dynamic performance during abnormal conditions improve transients w...

The effectiveness and reliability of the unified power flow controller (UPFC) are determined by insulated gate bipolar transistor (IGBT) valve. Thermal losses, conduction switching losses in IGBT valve all affect efficiency UPFC. failure rate converter valves is influenced junction temperature, which has an impact on converter's reliability. Piecewise linear electrical circuit simulation (PLECS...

Power systems exhibit various modes of oscillation due to interactions among system components. Many of the oscillations are due to synchronous machine rotors swinging relative to each other. Controllable Series Devices (CSD), i.e. series connected Flexible AC Transmission Systems (FACTS) devices, such as Unified Power Flow Controller (UPFC), Controllable Series Capacitor (CSC) and Quadrature B...

In this paper, the new hybrid particle swarm optimization (hybrid-PSO) based on particle swarm optimization (PSO), evolutionary programming (EP), and tabu search (TS) is developed. Hybrid-PSO is proposed to determine the optimal allocation of multi-type flexible AC transmission system (FACTS) controllers for simultaneously maximizing the power transfer capability of power transactions between g...