scholarly journals Characteristic and Surge Impedance Variation Impact on Transmission Line Performance

2018 ◽  
Vol 8 (4) ◽  
pp. 2602
Author(s):  
Muhyaddin J. H. Rawa
Keyword(s):  
Power Systems ◽  
Transmission Line ◽  
Voltage Regulation ◽  
Voltage Profile ◽  
Network Analyses ◽  
Impedance Variation ◽  
The Impact

<span>Modeling of power systems is essential to perform various network analyses. Voltage regulation, line losses and transmission line efficiency are greatly affected by transmission line parameters. Hence, accurate modeling of transmission line is required. The aim of this paper is to study the impact of characteristic and surge impedances on voltage profile, voltage regulation and transmission line efficiency.</span>

Toward Online Control of Local Bifurcation in Power Systems via Network Topology Optimization

2015 ◽  
Vol 25 (12) ◽  
pp. 1550167
Author(s):  
Lei Wang ◽  
Hsiao-Dong Chiang
Keyword(s):  
Topology Optimization ◽  
Power Systems ◽  
Transmission Line ◽  
Network Topology ◽  
Online Control ◽  
Power Grids ◽  
Local Bifurcations ◽  
Network Topology Optimization ◽  
Online Methods ◽  
The Impact

This paper presents online methods for controlling local bifurcations of power grids with the goal of increasing bifurcation values (i.e. increasing load margins) via network topology optimization, a low-cost control. In other words, this paper presents online methods for increasing power transfer capability subject to static stability limit via switching transmission line out/in (i.e. disconnecting a transmission line or connecting a transmission line). To illustrate the impact of network topology on local bifurcations, two common local bifurcations, i.e. saddle-node bifurcation and structure-induced bifurcation on small power grids with different network topologies are shown. A three-stage online control methodology of local bifurcations via network topology optimization is presented to delay local bifurcations of power grids. Online methods must meet the challenging requirements of online applications such as the speed requirement (in the order of minutes), accuracy requirement and robustness requirement. The effectiveness of the three-stage methodology for online applications is demonstrated on the IEEE 118-bus and a 1648-bus practical power systems.

scholarly journals Impact of PSS and STATCOM Devices to the Dynamic Performance of a Multi-Machine Power System

2017 ◽  
Vol 7 (6) ◽  
pp. 2113-2117 ◽  
Author(s):  
G. Shahgholian ◽  
E. Mardani ◽  
A. Fattollahi
Keyword(s):  
Power Systems ◽  
Power System ◽  
Dynamic Performance ◽  
Synchronous Generator ◽  
Power Network ◽  
Voltage Profile ◽  
System Stabilizer ◽  
The Impact ◽  
Intelligent Controllers ◽  
Network Power

This paper studies the impact of leveraging both static syn­ch­ron­ous compensator (STATCOM) and power system stabilizer (PSS) on multi-machine power systems. Considering a sta­ndard IEEE 9-bus test power network, classic and intelligent controllers are applied to achieve the desirable system performance. Simulated tests show the usefulness of STATCOM on network power quality in terms of voltage profile. In addition, it is shown that it can significantly improve the damping oscillations of synchronous generator under normal and abnormal network conditions. As shown, the PSS also contributes to improving the synch­ron­o­u­s generator parameters. It is also observed that using intelligent controllers with STATCOM and PSS leads to a better perfor­ma­nc­e relative to the classic controllers.

scholarly journals Secondary voltage regulation based on average voltage control

TecnoLógicas ◽  
2018 ◽  
Vol 21 (42) ◽  
pp. 63-78
Author(s):  
Edwin H. Lopera-Mazo ◽  
Jairo Espinosa
Keyword(s):  
Control System ◽  
Power Systems ◽  
Reactive Power ◽  
Voltage Control ◽  
Voltage Regulation ◽  
Voltage Profile ◽  
Real Power ◽  
Power Resources ◽  
Control Actions ◽  
Secondary Voltage

This paper compares a conventional Secondary Voltage Regulation (SVR) scheme based on pilot nodes with a proposed SVR that takes into account average voltages of control zones. Voltage control significance for the operation of power systems has promoted several strategies in order to deal with this problem. However, the Hierarchical Voltage Control System (HVCS) is the only scheme effectively implemented with some relevant applications into real power systems.The HVCS divides the voltage control problem into three recognized stages. Among them, the SVR is responsible for managing reactive power resources to improve network voltage profile. Conventional SVR is based on dividing the system into some electrically distant zones and controlling the voltage levels of some specific nodes in the system named pilot nodes, whose voltage levels are accepted as appropriate indicators of network voltage profile.The SVR approach proposed in this work does not only consider the voltage on pilot nodes, but it also takes the average voltages of the defined zones to carry out their respective control actions. Additionally, this innovative approach allows to integrate more reactive power resources into each zone according to some previously defined participation factors.The comparison between these strategies shows that the proposed SVR achieves a better allocation of reactive power in the system than conventional SVR, and it is able to keep the desired voltage profile, which has been expressed in terms of network average voltage.

scholarly journals Impact Analysis of 220 Kv And 400 Kv Transmission Lines on The Integrated Nepal Power System

2020 ◽  
Vol 2 (1) ◽  
pp. 75-80
Author(s):  
Ganesh Bhandari ◽  
Bishal Rimal ◽  
Sandeep Neupane
Keyword(s):  
Power System ◽  
Transmission Line ◽  
Transmission Lines ◽  
Impact Analysis ◽  
Flow Analysis ◽  
Load Flow ◽  
Active Power ◽  
Total System ◽  
Voltage Profile ◽  
The Impact

 Power is an essential requirement for the economic development of any country. To maintain the generation of electric power at an adequate level the power has to be transmitted in a proper form to the consumer. For determination of line losses, voltage profiles and expansion of system, load flow analysis is most essential tools. This paper deals with the impact analysis of new 220 kV and 400 kV lines on Interconnected Nepal Power System (132 kV grid) in Electrical Transient Analyzer Program (ETAP). It represents the present scenario of the power system of Nepal and their impact analysis. Load flow result of existing 132 kV line shows that there is about 44.56 MW active power losses in the transmission line before any compensation techniques. After the Optimal Capacitor Placement, in the existing transmission line the active power loss decreases to about 34.224 MW as well as the voltage profile at each bus improves. The load flow result of the under construction 220 kV and 400 kV lines on the existing line shows that the total system loss would decrease to about 27.445 MW with the voltage profile improvement. The simulated model, result and analysis are presented in this paper.

Optimal Allocation of Different Types of DG Sources Considering the Impact on Power Losses and Voltage in Distribution Networks

2013 ◽  
Vol 860-863 ◽  
pp. 2441-2446
Author(s):  
Xiao Ping Zhang ◽  
Xu Dong Song ◽  
Nan Hua Yu ◽  
Jong Cong Chen ◽  
Lei Lei Zhang
Keyword(s):  
Power Systems ◽  
Optimal Allocation ◽  
Reactive Power ◽  
Distribution Networks ◽  
Future Trend ◽  
Voltage Profile ◽  
Power Losses ◽  
Power Resources ◽  
Different Types ◽  
The Impact

As the distribution energies are becoming the future trend to solve the tense fossil fuel supplying and environmental issues, further research on the management of DGs connected to system is necessary. Management of reactive power resources is vital for stable and secure operation of power systems in power losses and voltage quality. Base on this, an optimal power allocation strategy of different types of DG units which result in the minimum line losses and relatively good voltage profile is proposed in this paper.

scholarly journals Investigating the application of Static Synchronous Compensator (STATCOM) for mitigating power transmission line losses

2017 ◽  
Author(s):  
◽  
Adebiyi Abayomi Aduragba
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Reactive Power ◽  
Power Transmission ◽  
Test System ◽  
Voltage Source ◽  
Voltage Profile ◽  
Power Losses ◽  
Static Synchronous Compensator ◽  
The Impact

Voltage instability and increased power loss on transmission lines are major challenges in power transmission due to ever increasing load growth. This work investigates the effect of Static Synchronous Compensator (STATCOM) to mitigate power losses and enhance the voltage stability of a transmission system. STATCOM, a shunt-connected power electronic device, operate as a Voltage Source Converter (VSC) to improve power transfer capacity of transmission lines by injecting a set of three-phase balanced sinusoidal current with controllable magnitude and phase angle into the transmission lines to regulate the line voltage and compensate for reactive power at the Point of Common Coupling (PCC). To validate the capacity of STATCOM in this light, a modified model of IEEE 14 bus test system was simulated using DIgSILENT PowerFactory v15. Four different load profiles were included by increasing the base load in a step of 10%. In each case, power flow was run with and without STATCOM incorporated in the network with a view to determine the impact of STATCOM on bus voltage and transmission line losses. The simulation results are obtained were recorded and analyzed. It is noted that there was sufficient improvement in the new voltage profile obtained for the weak buses of the system, the active and reactive power losses were mitigated by 17.73% and 24.80% respectively when STATCOM was incorporated at normal load. The results showed that STATCOM could give quick voltage support to reduce the likelihood of voltage collapse and mitigate power losses along the transmission lines. Reduction of reactive power losses along the lines is higher than the active power losses resulting in the improvement of the voltage profile as the device is connected to the system.

scholarly journals EFFECT of DG Optimizing on overload Transmission line Stability

2018 ◽  
Vol 225 ◽  
pp. 03023 ◽  
Author(s):  
Ali Abdullah Ali ◽  
Ahmed N Abdalla ◽  
R. Ishat
Keyword(s):  
Power Systems ◽  
Transmission Line ◽  
System Analysis ◽  
Reactive Power ◽  
Low Voltage ◽  
Heavy Load ◽  
Worst Case ◽  
Light Load ◽  
The Impact ◽  
Load Conditions

Typical steady state studies always treat the peak power demands as the worst case conditions. Periods of light load are also critical in the assessment of the possible state of a power system. While heavy load conditions are generally associated with overload, low voltage and generation deficiency, light load conditions may give rise to over-voltage and undesirable reactive power requirements at generation side. This paper focus on study the effect of DG Optimizing on overload Transmission line Stability. The system dispatch constraints should be taken into account to compensate or varying DG generation output and to enhance the operational performance of power systems. This dispatching operation depends on the change of DG generation and the dispatching strategy. The impact of DG generation uncertainty is limited with the generation dispatching operation and should not be neglected in system analysis.

scholarly journals Improved Coyote Optimization Algorithm for Optimally Installing Solar Photovoltaic Distribution Generation Units in Radial Distribution Power Systems

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-34 ◽  
Author(s):  
Thang Trung Nguyen ◽  
Thai Dinh Pham ◽  
Le Chi Kien ◽  
Le Van Dai
Keyword(s):  
Power Systems ◽  
Radial Distribution ◽  
Optimization Algorithm ◽  
Distribution Systems ◽  
Harmonic Distortion ◽  
Total Power ◽  
Solar Photovoltaic ◽  
Voltage Profile ◽  
Distribution Generation ◽  
The Impact

This paper proposes an improved coyote optimization algorithm (ICOA) for optimizing the location and sizing of solar photovoltaic distribution generation units (PVDGUs) in radial distribution systems. In the considered problem, four single objectives consisting of total power losses, capacity of all PVDGUs, voltage profile index, and harmonic distortions are minimized independently while satisfying branch current limits, voltage limits, and harmonic distortion limits exactly and simultaneously. The performance of the proposed ICOA method has been improved significantly since two improvements were carried out on the two new solution generations of the conventional coyote optimization algorithm (COA). By finding four single objectives from two IEEE distribution power systems with 33 buses and 69 buses, the impact of each proposed improvement and two proposed improvements on the real performance of ICOA has been investigated. ICOA was superior to COA in terms of capability of finding higher quality solutions, more stable search ability, and faster convergence speed. Furthermore, we have also applied five other metaheuristic algorithms consisting of biogeography-based optimization (BBO), genetic algorithm (GA), particle swarm optimization algorithm (PSO), sunflower optimization (SFO), and salp swarm algorithm (SSA) for dealing with the same problem and evaluating further performance of ICOA. The result comparisons have also indicated the outstanding performance of ICOA because it could find much better results than these methods, especially SFO, SSA, and GA. Consequently, the proposed ICOA is a very effective method for finding the optimal location and capacity of PVDGUs in radial distribution power systems.

scholarly journals Comparison of Estimated Power Transfer in Transmission Line With and Without Shunt Compensator Using Different Line Models

2020 ◽  
Vol 8 (6S) ◽  
pp. 107-112
Keyword(s):  
Power Systems ◽  
Transmission Line ◽  
Transmission Lines ◽  
Power Transfer ◽  
Voltage Profile ◽  
Line Model ◽  
Section Model ◽  
Shunt Compensation ◽  
Shunt Compensator

In power systems, compensation techniques are used to improve the power transfer capacity in the transmission lines. Controlling the voltage profile along the line helps to control the transmittable power and this is achieved through compensation techniques. In this paper, different line models are used for the estimated power transmitted in the line both with and without shunt compensation. It is observed that with the Bergeron line model and PI-section model the estimated power is higher compared to that with the series RL model both with and without shunt compensation. PSCAD is used for the simulation.

scholarly journals Optimal PID Controllers for AVR System Considering Excitation Voltage Limitations Using Hybrid Equilibrium Optimizer

Machines ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 265
Author(s):  
Martin Ćalasan ◽  
Mihailo Micev ◽  
Milovan Radulović ◽  
Ahmed F. Zobaa ◽  
Hany M. Hasanien ◽  
...  
Keyword(s):  
Power Systems ◽  
Water Cycle ◽  
Voltage Regulation ◽  
System Stability ◽  
Voltage Regulator ◽  
Excitation Voltage ◽  
Avr System ◽  
Generator Voltage ◽  
Simulation Results ◽  
The Impact

Automatic voltage regulator (AVR) represents the basic voltage regulator loop in power systems. The central part of this loop is the regulator, which has parameters that define the speed of the voltage regulation, quality of responses, and system stability. Furthermore, it has an impact on the excitation voltage change and value, especially during transients. In this paper, unlike literature approaches, the experimental verifications of the impact of regulator parameters on the excitation voltage and current value are presented. A novel hybrid metaheuristic algorithm for obtaining regulator parameters determination of the AVR system, and a novel regulator design taking into account excitation voltage limitation are presented. The proposed algorithm combines the properties and characteristics of equilibrium optimizer and evaporation rate water cycle algorithms. The proposed algorithm is effective, fast, and accurate. Both experimental and simulation results show that the limitation of the excitation voltage increases the settling time of the generator voltage during reference change. Additionally, the simulation results show that the optimal values of PID parameters are smaller for limited excitation voltage values.

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