Farhad Namdari - Academia.edu (original) (raw)

Papers by Farhad Namdari

2019 International Power System Conference (PSC), Dec 1, 2019

In this paper a novel method called Vector Analysis (VA), using a new instability detection index... more In this paper a novel method called Vector Analysis (VA), using a new instability detection index is proposed to provide wide area voltage stability for the power systems. The index extraction process relies on measurements of active and reactive powers from connected buses to the generator bus. Moreover, as long as VA predicts voltage collapse, through disconnecting weak lines and based on network graph, zoning is carried out in the power system. For the aim of system observability, phasor measurement units (PMUs) placement, have also been optimized by Swarm Robotics Search & Rescue (SRSR) algorithm. Simulations have been carried out on IEEE 39- bus test system which demonstrates the accuracy of index distinction in voltage stability assessment and system zoning.

IEEE Transactions on Dielectrics and Electrical Insulation, Jun 1, 2016

A part of power distribution system losses is related to the growth of trees beside power lines. ... more A part of power distribution system losses is related to the growth of trees beside power lines. Despite the fact that the first need for the reduction of tree losses is an accurate evaluation, a detailed study has not been done in this field thus far. Earlier works about trees interfering with power lines have not considered power loss and often studied it as a high impedance fault problem. In addition, these studies have been just focused on the leakage current measurement of some specific trees touching medium voltage distribution network, while it is low voltage network in urban and rural areas that has maximum reports of tree contact. Furthermore, the amount of leakage current greatly depends on the internal tissues of trees and environmental conditions. With regard to the differences in tree types and weather conditions around the world, losses will have different degrees; therefore, studies cannot be confined only to the results of some particular types of trees. Considering the shortcomings of these studies, this paper tries to determine a factor for environmental conditions. By applying this factor, the leakage current values for different weather conditions are estimated. Besides, this paper uses 3D finite element method for modeling tree losses by considering type of trees. For assessing the validity of the modeling results, the range of leakage currents is obtained from experiments in a real low voltage network. The results of this study remove doubt about the reliability of loss calculation and shows that loss estimation by modeling is an effective and reliable tool in this field.

International Journal of Electrical Power & Energy Systems, Mar 1, 2022

DOAJ (DOAJ: Directory of Open Access Journals), Aug 1, 2021

This paper studies the reciprocal impact of distribution network protection and reconfiguration o... more This paper studies the reciprocal impact of distribution network protection and reconfiguration of active Nowadays, with increasing energy consumption in distribution networks and the demand of consumers to buy highly reliable power, it is of high importance to establish adapt between protection and operation of the power system. distribution system. Accordingly, a distribution network reconfiguration is carried out to find the optimal switching operations in an economic way. Since the switching operations will change network topology as well as short circuit level of buses, the protection coordination may be invalid. To address this issue, constraints of the coordination of protection relays and fuses is being formulated and added to the reconfiguration problem. Moreover, the nonlinear equations of the problem are linearized and are transformed the reconfiguration problem into Mixed-Integer Linear Programming (MILP) one to achieve the global optimal solution. The proposed method has been implemented on 33 bus distribution network. The results clearly show effectiveness of the active and reactive power management in an intelligent distribution network considering protection concepts.

International Journal of Electrical Power & Energy Systems, Nov 1, 2022

Iranian Journal of Science and Technology-Transactions of Electrical Engineering, Nov 6, 2019

One of the essential strategies for restricting fault areas and reducing the number of affected c... more One of the essential strategies for restricting fault areas and reducing the number of affected customers in each outage is the simultaneous use of distribution automation systems and distribution generations (DGs). The use of DGs in the distribution networks affects the problem of remote control switch (RCS) placement. This study presents a new and practical method to determine the optimal location of RCSs in the presence of DGs. In this research, an approach for the minimization of energy not supplied, the costs of installation, maintenance and operation of equipment, taking into account the practical parameters of the network have been presented. Also, the structure and possible constraints of the real network, according to opinion of experts, are included. The practical parameters have been extracted by the geographic information system and software of recording event (ENOX). The effects of DG units on the optimal number and location of switches have been assessed. To optimize the problem, a combination of genetics and particle swarm optimization algorithms has been utilized. The efficiency of the proposed method is shown by simulation results on standard 33-bus and real medium-voltage networks.

Advancements in telecommunication technology have opened up new horizons in power system protecti... more Advancements in telecommunication technology have opened up new horizons in power system protection such as wide area protection. In this protection data collected at busbars of power system are transmitted to a control centre where a backup protection is provided to prevent blackouts. This paper proposes a technique for speeding up the protection while maintaining its integrity. Based on the fact that voltages drop fast under fault conditions in a network, voltage signals derived from the busbars have been used as a complementary backup for differential protection used on wide area protection. The applicability of the new algorithm has been tested with the simulation study on the Northern Ireland Electricity 275 kV network and the results presented show validity of the new method.

Zenodo (CERN European Organization for Nuclear Research), Jun 1, 2014

International Journal of Electrical Power & Energy Systems, Feb 1, 2021

Carbon capture and storage (CCS) can be carried out in conjunction with enhanced oil recovery (EO... more Carbon capture and storage (CCS) can be carried out in conjunction with enhanced oil recovery (EOR) to yield complementary environmental and economic gains. Thus, CCS in combination with EOR will provide economical value from incremental oil recovery besides providing source for CO2 sequestration. Given a fixed CO2 supply to be distributed to different reservoirs, it is necessary to develop an allocation model to maximize profit from EOR operations. In this study, a discrete-time optimization model is developed subject to scheduling, capacity and flow rate constraints. A case study is presented to illustrate the model.

Sustainable Energy Technologies and Assessments

IET Generation, Transmission & Distribution

Majlesi Journal of Mechatronic Systems, Mar 1, 2021

Weak damping of low frequency oscillations is a frequent phenomenon in electrical power systems. ... more Weak damping of low frequency oscillations is a frequent phenomenon in electrical power systems. These frequencies can be damped by power system stabilizers. Unified power flow controller (UPFC), as one of the most important FACTS devices, can be applied to increase the damping of power system oscillations and the more effect of this controller on increasing the damping of oscillations depends on its proper placement in power systems. In this paper, a technique based on controllability is proposed to select proper location of UPFC and the best input control signal in order to enhance damping of power oscillations. The effectiveness of the proposed technique is demonstrated in IEEE 9 bus power system.

Accurate fault classification and localization are the bases of protection for transmission syste... more Accurate fault classification and localization are the bases of protection for transmission systems. This paper presents a new method for classifying and showing location of faults by travelling waves and modal analysis. In the proposed method, characteristics of different faults are investigated using Clarke transformation and initial current traveling wave; then, appropriate indices are introduced to identify different types of faults. Continuous wavelet transform (CWT) is employed to extract information of current and voltage travelling waves. Fault location and classification algorithm is being designed according to wavelet transform coefficients relating to current and voltage modal components. The performance of the proposed method is tested for different fault conditions (different fault distance, different fault resistances, and different fault inception angles) by using PSCAD and MATLAB with satisfactory results.

Applied Soft Computing, 2017

Abstract In this paper, a novel heuristic algorithm is proposed to solve continuous non-linear op... more Abstract In this paper, a novel heuristic algorithm is proposed to solve continuous non-linear optimization problems. The presented algorithm is a collective global search inspired by the swarm artificial intelligent of coordinated robots. Cooperative recognition and sensing by a swarm of mobile robots have been fundamental inspirations for development of Swarm Robotics Search & Rescue (SRSR). Swarm robotics is an approach with the aim of coordinating multi-robot systems which consist of numbers of mostly uniform simple physical robots. The ultimate aim is to emerge an eligible cooperative behavior either from interactions of autonomous robots with the environment or their mutual interactions between each other. In this algorithm, robots which represent initial solutions in SRSR terminology have a sense of environment to detect victim in a search & rescue mission at a disaster site. In fact, victim’s location refers to global best solution in SRSR algorithm. The individual with the highest rank in the swarm is called master and remaining robots will play role of slaves . However, this leadership and master position can be transitioned from one robot to another one during mission. Having the supervision of master robot accompanied with abilities of slave robots for sensing the environment, this collaborative search assists the swarm to rapidly find the location of victim and subsequently a successful mission. In order to validate effectiveness and optimality of proposed algorithm, it has been applied on several standard benchmark functions and a practical electric power system problem in several real size cases. Finally, simulation results have been compared with those of some well-known algorithms. Comparison of results demonstrates superiority of presented algorithm in terms of quality solutions and convergence speed.

IET 9th International Conference on Developments in Power Systems Protection (DPSP 2008), 2008

Yafteh, 2019

Background: Electromagnetic fields have various effects on the biochemical and cellular behavior ... more Background: Electromagnetic fields have various effects on the biochemical and cellular behavior of microorganisms due to radiation. It is necessary to investigate more extensively the effects of these magnetic fields on some microorganisms, such as bacteria. The purpose of this study was tp investigate the effects of magnetic fields on Escherichia coli bacteria (PTCC 1330). Materials and Methods: E.coli bacteria were prepared in liquid growth medium at the proper density. Then, the bacteria were placed in a magnetic field of 0, 1, 5, 10, 20, 30, 40 and 50 Hz at 0, 4, 8, 12, 16, 20, 24, 28 and 32 time intervals. Afterwards, their population was calculated, and the impact of these waves on the bacteria growth phases, based on the factorial pattern, was measured. Results: Field intensities of 1, 5, 10 and 20 Hz caused an increase in the number of bacteria cells. With increasing field intensity to 50 Hz, the growth of bacteria was reduced. Field intensities of 5, 30, 40 and 50 Hz cause...

In this paper, a novel high-speed protection scheme, for transmission lines based on initial curr... more In this paper, a novel high-speed protection scheme, for transmission lines based on initial current traveling waves and employing mathematical morphology (MM) is presented. This scheme, by comparing polarity and arrival time of initial current traveling wave from two terminals of the protected line, can discriminate the fault direction and internal faults from external faults rapidly. A new MM filter to extract transient components from fault-induced transient signals is designed. This MM filter can fast and accurately detect the arrival time and polarity of traveling waves in all conditions. Extensive simulation studies using EMTP and MATLAB are performed to evaluate the validity and reliability of the proposed scheme. The simulation results show that the proposed protection scheme can fast and reliably discriminate the fault direction and the internal faults from external faults in the most of conditions, especially in high impedance fault and low inception angle fault situation ...

One of the three aspects of the stability in power systems is voltage stability. Since voltage co... more One of the three aspects of the stability in power systems is voltage stability. Since voltage collapse can be a reason of the global blackout in power networks, the importance of this study is revealed. In this regard, this paper focuses on transient voltage stability problem and to achieve this goal we use wide area measurement system. To transient voltage stability assessment, a novel fast index is used. The index in one of its three parts monitors the produced reactive power in the network. Important events like generator outage, line outage and load increasing are studied in the paper. Simulation results in the DIgSILENT Power Factory software on IEEE 39 buses dynamic system demonstrate the efficiency of proposed approach with respect to other methods.

The present study investigated economic load dispatch problem, taking into consideration valve po... more The present study investigated economic load dispatch problem, taking into consideration valve point loading effect using an imperialist competitive algorithm. To portray the efficiency of the proposed method, the algorithm was applied to two popular test systems in the area including 13 and 40 thermal units. The obtained results from the algorithm were compared to those of other algorithms which indicated the efficiency and response of the proposed algorithm in solving economic load dispatch problem.