With the increase in electric power equipment, transmission systems are becoming more heavily loaded. Due to the increasing demand of electricity day by day more and more generation capacity is required. An increased demand of electricity requires increased power transfer through lines which is limited by thermal, voltage and stability of lines.
Published online Apr Hassan 3 Fadi M. Hassan Find articles by M. The authors have declared that no competing interests exist. Conceived and designed the experiments: Received Dec 7; Accepted Mar 6. Abstract This study examines a new approach to selecting the locations of unified power flow controllers UPFCs in power system networks based on a dynamic analysis of voltage stability.
In this study, the locations of the UPFCs are identified by dynamically varying the loads across all of the load buses to represent actual power system conditions. The simulation results demonstrate the effectiveness of the proposed method.
When the UPFCs are placed in the locations obtained with the new approach, the voltage stability improves. A comparison of the steady-state VSIs resulting from the UPFCs placed in the locations obtained with the new approach and with particle swarm optimization PSO and differential evolution DEwhich are static methods, is presented.
In all cases, the UPFC locations given by the proposed approach result in better voltage stability than those obtained with the other approaches. Introduction The demand for electricity has significantly increased in recent years.
To meet the increasing demand, new power system networks must be constructed or existing networks must be expanded.
However, developing new systems is expensive and requires a considerable amount of time. Therefore, power utilities are compelled to maximize the use of their available resources [ 1 ].
Consequently, the existing power transmission lines become more heavily loaded, and they must be operated closer to their maximum stability limits and for longer periods of time, resulting in a higher probability of voltage instability. Voltage instability is mainly associated with the inability of the power system to maintain acceptable voltages at all buses in the network [ 23 ].
Various control strategies, such as generation and energy transfer rescheduling, bringing standby generators online, load shedding, and volt—ampere reactive VAR support through series or shunt capacitors, are commonly used to improve voltage stability [ 4 — 6 ].
However, most of these methods require electro-mechanical controllers, which are slow and subject to wear. The Electric Power Research Institute has proposed the use of flexible alternating current transmission systems FACTS devices [ 7 ], which are based on self-commutated semiconductor devices.
Among the various types of FACTS devices, the unified power flow controller UPFC is the most effective because it can be used for voltage regulation, series compensation, phase angle regulation, and control of active or reactive power separately [ 8 ].
UPFCs can solve numerous power system problems including voltage instability without the drawbacks of electromechanical devices. However, UPFCs must be placed at suitable locations in the power system network to maximize their functionality.
The techniques used for selecting the locations of FACTS devices can be broadly classified into optimization-based and index-based methods [ 9 — 11 ]. In previous studies, multi-objective optimization techniques have been used to select the locations of FACTS devices to improve the static voltage stability of a power system network.
For example, to determine the optimal location and the parameter settings of a UPFC to improve voltage stability, a differential evolution DE technique was used in [ 12 — 14 ]. Particle swarm optimization PSO and genetic algorithms GA were implemented in [ 15 — 18 ] and [ 19 — 21 ], respectively, for choosing the locations for FACTS devices, where the objectives were congestion relief and voltage stability.
However, optimization of the objectives is not guaranteed in these approaches [ 26 ].TM Corporation STATCOM Advanced Reactive Power Compensation Tethnolog from the Developers of the YOrlds First Commercial STATCOM Syste. Thesis Final. FACT new. flexible AC transmission systems.
RAJU PPT. Classification Scheme for FACTS Controllers.
Power Flow Control With UPFC. Flexible Ac Transmission Systems (Facts) - Full Paper Presentation - initiativeblog.comot. A Unified Power Flow Controller (or UPFC) is an electrical device for providing fast-acting reactive power.
MODELLING OF UNIFIED POWER FLOW CONTROLLER,ppt - Download as Powerpoint Presentation .ppt /.pptx), PDF File .pdf), Text File .txt) or view presentation slides online. OPTIMAL LOCATION OF UPFC FOR VOLTAGE STABILITY ENHANCEMENT USING MPSO AND ECI ALGORITHM FOR POWER FLOW ANALYSIS (UPFC) is most effective to improve the enhancement of voltage stability and reduces the power loss.
A new model is proposed in this thesis to improve existing power-based model by using the Norton. ACKNOWLEDGEMENTS We would like to express our deepest gratitude to our thesis supervisor Shri. Y. Chandrasekhar, Assistant Professor, Electrical Engineering Department, National Institute of technology, Warangal, for his valuable guidance and.
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