GICs: The Bane of Technology-Dependent Societies

Flexible alternating current transmission systems are used since nearly four decades and present very good dynamic performances. The purpose of this work is to study the behaviour of a system where static compensator (STATCOM) is located at the midpoint of a long transmission line functioning in disturbed modes with various levels of load caused by tripping and then, reclosing of the incoming station breaker. The studied model and starting from the analysis of various alternatives will lead to the checking of the aptitude of the STATCOM to maintain the voltage plan and to improve the power flow in electro-energetic system which is the east region of Algerian 400 kV transmission network. The steady state performance of STATCOM’s controller is analysed through computer simulations with MATLAB/Simulink program. The simulation results have demonstrated that STATCOM can be effectively applied in power transmission systems to solve the problems of poor dynamic performance and voltage regulation. Keywords: STATCOM, reactive power, power flow, voltage plan, breaker automatic recloser.

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Calculation of geomagnetically induced currents reactive power loss disturbance in China’s UHV power grid considering the influence of 500 kV power grid

Scientia Sinica Technologica ◽

10.1360/n092016-00126 ◽

2016 ◽

Vol 46 (11) ◽

pp. 1146-1156

Author(s):

Chen QIAN ◽

LianGuang LIU ◽

XiaoPei QIN

Keyword(s):

Power Loss ◽

Reactive Power ◽

Power Grid ◽

Geomagnetically Induced Currents ◽

Induced Currents

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Intelligent based technique for under voltage load shedding in power transmission systems

Indonesian Journal of Electrical Engineering and Computer Science ◽

10.11591/ijeecs.v17.i1.pp110-117 ◽

2020 ◽

Vol 17 (1) ◽

pp. 110

Author(s):

Saiful Firdaus Abd Shukor ◽

Ismail Musirin ◽

Zulkifli Abd Hamid ◽

Mohamad Khairuzzaman Mohamad Zamani ◽

Mohamed Zellagui ◽

...

Keyword(s):

Power System ◽

Reactive Power ◽

Power Transmission ◽

Voltage Control ◽

Test System ◽

Load Shedding ◽

Instability Condition ◽

Transmission Systems ◽

Voltage Instability ◽

Power Transmission Systems

<p>The increasing demand of electric power energy and the presence of disturbances can be identified as the factors of voltage instability condition in a power system. A secure and reliable power system should be considered to ensure smooth delivery of electricity to the consumers. A power system may experience undesired event such as voltage instability condition leading to voltage collapse or cascading collapse if the system experiences lack of reactive power support. Thus, to avoid blackout and cascaded tripping, load shedding is the last resort to prevent a total damage. Under Voltage Load Shedding (UVLS) scheme is one of the possible methods which can be conducted by thepower system operators to avoid the occurrence of voltage instability condition. This paper presents the intelligent based technique for under voltage load shedding in power transmission systems. In this study, a computational based technique is developed in solving problem related to UVLS. The integration between a known computational intelligence-based technique termed as Evolutionary Programming (EP) with the under-voltage load shedding algorithm has been able to maintain the system operated within the acceptable voltage limit. Loss and minimum voltage control as the objective function implemented on the IEEE 30-Bus Reliability Test System (RTS) managed to optimally identify the optimal location and sizing for the load shedding scheme. Results from the studies, clearly indicate the feasibility of EP for load shedding scheme in loss and minimum voltage control in power system.</p>

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Reactive Power Role and Its Controllability in AC Power Transmission Systems

Power Systems - Reactive Power Control in AC Power Systems ◽

10.1007/978-3-319-51118-4_3 ◽

2017 ◽

pp. 117-136

Author(s):

Esmaeil Ebrahimzadeh ◽

Frede Blaabjerg

Keyword(s):

Reactive Power ◽

Power Transmission ◽

Transmission Systems ◽

Ac Power ◽

Power Transmission Systems ◽

Power Role

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