Multiobjective Optimization for HTS Fault-Current Limiters Based on Normalized Simulated Annealing

Sharifi, Reza; Heydari, Hossein

doi:10.1109/tasc.2009.2020692

Cited by 18 publications

(15 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Finally, (11) and (14) can be cast in matrix form, as shown in (16) and (17), shown at the top of the next page. For these equations, the following relations are valid:…”

Section: Adimentioning

confidence: 99%

The ADI Method for Simulations of SFCL

Sousa

Noë

2015

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

In spite of the recent advances achieved with superconducting fault current limiters, modeling and simulation of such devices are still important issues. Different approaches have been used to model the transient behavior of such devices when submitted to fault currents. In this paper, the alternating direction implicit method is used to numerically solve the thermal equations discretized by the finite-difference method (FDM). That is a fast method to solve the system of differential equations resultant from the FDM discretization. It also allows the insertion of inhomogeneities of the superconducting tapes in the simulation and the study of its influence on fault limitation. The results of simulations models were compared with experimental data. A good agreement between simulated current and voltages with tests has been found in the present work. In addition, the temperature increase and the electrical field in the tapes during the fault time is shown.Index Terms-Alternating direction implicit (ADI), superconducting fault current limiter (SFCL), transient simulations.

show abstract

“…Finally, (11) and (14) can be cast in matrix form, as shown in (16) and (17), shown at the top of the next page. For these equations, the following relations are valid:…”

Section: Adimentioning

confidence: 99%

The ADI Method for Simulations of SFCL

Sousa

Noë

2015

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

show abstract

“…where u s is the SFCL voltage dip, Q and P are the generated heat and the power cooling system, respectively [22][23][24]. Although, the SFCL should operate rapidly to limit the first peak of fault current.…”

Section: Electro-thermal Modeling Of Superconducting Fault Currenmentioning

confidence: 99%

Study of RSFCL effect to improve the behavior of DFIG during a fault

Falahzadeh

Heydari

2012

2012 Second Iranian Conference on Renewable Energy and Distributed Generation

View full text Add to dashboard Cite

As electrical energy will be supplied from renewable sources; large wind farms are being connected to the existing distribution network may lead to the increasing fault levels beyond the capacity of existing switchgear. Also, with connecting distributed generation the radial structure of distribution network is disturbed and some disruption may appear to its protection system. Using fault current limiters at the output of large distributed generation units, can be considered as a solution to restrict the fault current and prevent disruption performance of protective equipment. In this paper, resistive superconducting fault current limiters (RFCLs) are introduced and their performance in management of fault level in a power system including wind turbine shown by PSCAD/EMTDC simulation. Studies showed that the proposed FCL is not only able to decrease fault level but also can to prevent incoordination protective equipment to the network. Keywords-renewable energy, Doubly fed induction generator (DFIG), resistive superconducting fault current limiter Introduction,short circuit currentTHE last few years has seen a huge investment in renewable energy resources as alternative sources of energy. Renewable energy sources such as wind turbine and photovoltaic systems are favored for their advantages, such as low maintenance and low pollution. In recent decades, Wind energy is the fastest growing source of renewable energy in the power industry [1].Among the different alternatives to construct variable speed wind turbines, doubly fed induction generators (DFIGs) are the most commonly used. The major benefit of the doubly-fed induction generator, which has made it popular, is that the power electronic equipment only has to handle a fraction (20-30%) of the total system power. This means that the losses in the power electronic converter can be reduced compared to a system where the converter has to handle the total power. In addition, the cost of the converter becomes lower [2][3][4]. With the rapid development of the wind turbine generation system and its increased capacity, the level of associated short-circuit current during a fault will be increased in the distribution system and it can lead to the increasing fault levels beyond the capacity of existing switchgear and network equipments. Then, these protection devices must be upgraded with a higher shortcircuit rating or they must be set up again according to the new conditions of the changed power grid. The former situation requires high costs for the replacement of the protection devices [5].Using fault current limiters at the output of wind turbines, can be considered as a solution to restrict the fault current and prevent disruption performance of protective equipment [6]. Fault current limiting devices have been put forward in the form of power electronics, magnet technology, solid state and superconducting materials. The superconducting fault current limiter (SFCL) causes no power loss in a steady-state condition and improves the transient stability of power system...

show abstract

“…Volume (15) Volume (16) where is the SFCL voltage drop and and are the generated heat and the power cooling system, respectively.…”

Section: Modeling Of a Resistive Sfclmentioning

confidence: 99%

“…This paper attempts to fill this void by providing a simultaneous optimization of 3-D alignment for optimal operation of a combinatory UPQC and a resistive SFCL in order to reduce the volt-ampere rating of the UPQC, thereby reducing the cost of its installation. This is accomplished by an algorithm based on the prioritized multiobjective simulated annealing (PMOSA) as being improved by normalization, a feasible method for the optimized design of the proposed configuration [14], [15]. However, for comparative purposes, the optimization process is verified by the analytic hierarchy process (AHP), that is, one of the most prevalent MCDM techniques.…”

Section: Introductionmentioning

confidence: 99%

Optimization Scheme in Combinatorial UPQC and SFCL Using Normalized Simulated Annealing

Heydari

Moghadasi

2011

IEEE Trans. Power Delivery

Self Cite

View full text Add to dashboard Cite

This paper presents a positive approach in an optimized design of a combinatory unified power-quality conditioner (UPQC) and superconducting fault current limiters (SFCLs). This is based on a normalized simulated annealing algorithm compared with analytic hierarchy process objective optimization. The optimization algorithm for simultaneous optimization computes and produces three-dimensional alignments in Pareto front at the end of the optimization run. The results show that the SFCL can reduce the volt-ampere rating of the UPQC by limiting the fault current, thereby reducing the cost of UPQC installation. The aforementioned algorithm requires advanced numerical techniques for simulation studies by PSCAD/EMTDC on a sample distribution system for determining a global optimal combination of UPQC and SFCL by considering individual parameters and accounting for the constraints, which is the main motivation of this paper. This will result in a more thorough knowledge of "scaling factors" and the system quality mechanism which will enable the most efficient systems from the viewpoints of cost cutting, energy savings, and downsizing.Index Terms-Analytic hierarchy process, multiobjective decision making, power quality (PQ), simulated annealing, superconducting fault current limiter, unified power-quality conditioner (UPQC).

show abstract

Multiobjective Optimization for HTS Fault-Current Limiters Based on Normalized Simulated Annealing

Cited by 18 publications

References 39 publications

The ADI Method for Simulations of SFCL

The ADI Method for Simulations of SFCL

Study of RSFCL effect to improve the behavior of DFIG during a fault

Optimization Scheme in Combinatorial UPQC and SFCL Using Normalized Simulated Annealing

Contact Info

Product

Resources

About