scholarly journals STATCOM’s contribution to the improvement of voltage plan and power flow in an electrical transmission network

2018 ◽  
Vol 8 (1) ◽  
pp. 41-52
Author(s):  
Adel Amiar ◽  
Mohamed Adjabi
Keyword(s):  
Power Flow ◽  
Reactive Power ◽  
Power Transmission ◽  
Dynamic Performance ◽  
Voltage Regulation ◽  
Transmission Network ◽  
Electrical Transmission ◽  
Transmission Systems ◽  
Power Transmission Systems ◽  
Flexible Alternating Current Transmission

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.

scholarly journals STUDY ON EFFECT OF UPFC DEVICE IN ELECTRICAL TRANSMISSION SYSTEM: POWER FLOW ASSESSMENT

2013 ◽  
pp. 70-74
Author(s):  
CH. CHENGAIAH ◽  
R.V.S. SATYANARAYANA ◽  
G.V. MARUTHESWAR MARUTHESWAR
Keyword(s):  
Transmission Lines ◽  
Power Flow ◽  
Reactive Power ◽  
Power Transmission ◽  
Stability Limit ◽  
Transmission System ◽  
Real Time Control ◽  
Electrical Transmission ◽  
Transmission Systems ◽  
Time Control

The power transfer capability of electric transmission lines are usually limited by large signals ability. Economic factors such as the high cost of long lines and revenue from the delivery of additional power gives strong intensive to explore all economically and technically feasible means of raising the stability limit. On the other hand, the development of effective ways to use transmission systems at their maximum thermal capability. Fast progression in the field of power electronics has already started to influence the power industry. This is one direct out come of the concept of FACTS aspects, which has become feasible due to the improvement realized in power electronic devices in principle the FACTS devices should provide fast control of active and reactive power through a transmission line. The UPFC is a member of the FACTS family with very attractive features. This device can independently control many parameters. This device offers an alternative mean to mitigate transmission system oscillations. It is an important question is the selection of the input signals and the adopted control strategy for this device in order to damp power oscillations in an effective and robust manner. The UPFC parameters can be controlled in order to achieve the maximal desire effect in solving first swing stability problem. This problem appears for bulky power transmission systems with long transmission lines. In this paper a MATLAB Simulink Model is considered with UPFC device to evaluate the performance of Electrical Transmission System of 22 kV and 33kV lines. In the simulation study, the UPFC facilitates the real time control and dynamic compensation of AC transmission system. The dynamic simulation is carried out in conjunction with the N-R power flow solution sequence. The updated voltages at each N-R iterative step are interpreted as dynamic variables. The relevant variables are input to the UPFC controllers.

scholarly journals GICs: The Bane of Technology-Dependent Societies

Eos ◽  
2015 ◽  
Vol 96 ◽  
Author(s):  
Delores Knipp
Keyword(s):  
High Voltage ◽  
Power Loss ◽  
Reactive Power ◽  
Power Transmission ◽  
Geomagnetically Induced Currents ◽  
Transmission Systems ◽  
Power Transmission Systems ◽  
Induced Currents

Geomagnetically Induced Currents can cause voltage swings, transformer heating, and reactive power loss in high-voltage power transmission systems.

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

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>

scholarly journals Impact of static reactive power compensator (SVC) on the power grid

2020 ◽  
Vol 11 ◽  
pp. 96-104
Author(s):  
Abdelkader Rahmouni
Keyword(s):  
Control System ◽  
Electric Power ◽  
Reactive Power ◽  
Power Transmission ◽  
Voltage Regulation ◽  
Electrical Network ◽  
Transmission Network ◽  
Electrical Networks ◽  
Current Transmission ◽  
Reactive Power Compensator

The work presented in this paper is a contribution to the problem of controlling the reactive powers and the voltages in an electrical network. Among these control tools, the static reactive power compensator (SVC) has been chosen because of its simplicity of control. The SVC is among the FACTS 'Alternative Flexible Current Transmission Systems' devices that help to deal with problems encountered in the operation of electrical networks either in the distribution side or in the transport side. In this work, the SVC is used to control the reactive power and the voltage in an electric power transmission network. In order to improve its efficiency, three voltage regulation systems have been chosen in the control system of this compensator.

Damping Inter-Area Oscillations by Coordination of 3PSS and UPFC Using PSO

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
Ali Abdulazeez ◽  
Bassam Mohammed ◽  
Bilal Nasir ◽  
Mohammed Yasen
Keyword(s):  
Power System ◽  
Transmission Lines ◽  
Power Flow ◽  
Reactive Power ◽  
Dynamic Performance ◽  
System Stability ◽  
Local Mode ◽  
Flexible Alternating Current Transmission ◽  
Bus Voltage ◽  
System Stabilizer

Power System Stabilizer (PSS) is one of the most used controllers in the local generations, primarily it aimed to suppress local mode of oscillations. On the other hand, the Unified Power Flow Controllers (UPFC) the most versatile member of flexible alternating current transmission system devices to simultaneously control real and reactive power flows on transmission lines, as well as regulate selected bus voltage. Each of these controllers, on their own, can show satisfactory performance to enhance power system stability. However, when they utilized together, their dynamic performance can degrade due to controller interaction, that should be strategically optimized. In this paper, the coordinated design of pss's and upfc is realized to damp inter-area oscillations in  two-area power system using particle swarm optimization (PSO) method. The simulated cases in Matlab environment show that the interaction of pss's and upfc can be optimized, so the inter-area oscillations can be effectively mitigated following after fault, the simulation results of the uncoordinated design are also presented.

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