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Hamid Radmanesh,S.H.Fathi,G.B. Gharehpetian 대한전기학회 2016 Journal of Electrical Engineering & Technology Vol.11 No.5
Recently, various types of Solid State Fault Current Limiters (SSFCLs) have been proposed. These SSFCLs can improve the voltage quality, decrease the transmission losses, and also can enhance the distribution network stability but there are some practical problems with these FCLs. This paper proposes a modified FCL with focusing on the components optimization, efficiency improvement and reducing the cost. The suggested FCL uses a series AC reactor with controllable power electronic switches named Thyristor-Controlled AC Reactor (TCAR) which is connected in series with the feeder to limit the fault current and avoid fault current problems, which impairs overall distribution network reliability. The influence of TCAR on the fault current is analyzed using analytical, simulation and laboratory tests. The performance of the proposed TCAR in the simple distribution network is examined. The simulation and experimental results are in a good agreement with together and show the proper operation of the proposed TCAR during the normal and fault operation modes.
Frequency Response Model of Power System in Presence of Thermal, Wind and Hydroelectric Units
Darani Shirin Hassanzadeh,Rabbanifar Payam,Aliabadi Mahmood Hosseini,Radmanesh Hamid 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.4
Loss of large generation units or unforeseen changes in consumption load causes disturbances in power system operation. Operators face serious challenges by increasing the penetration level of renewable energies in unit commitment and inability of these resources in providing inertial frequency response. Therefore, having system frequency response model makes operators to have a better understanding of system function and frequency behavior encounter disturbances and critical situations. This paper, studies the importance and necessity of recognizing the frequency response model and presents an integrated model of system frequency response in the presence of thermal, wind and hydroelectric units. Using the Routh stability criterion method, the proposed fifth-order model converts to a second-order model with an acceptable approximation. Proposed system frequency response in a six-bus power system is investigated and effect of changes in the main components on the frequency behavior of system is checked out. Researchers can linearize the obtained frequency response model using conventional linearization methods and use it as a frequency constraint in optimization and security-constrained unit commitment problems. Besides that, frequency behavior of the power system consisting of thermal units after addition of wind and hydroelectric units is studied. This paper helps researchers to have simplified calculation, beneficial and accurate results, while saving time, money and fossil reserves.