scholarly journals An approach for real power scheduling to improve system stability margins under normal and network contingencies

2004 ◽  
Vol 71 (2) ◽  
pp. 109-117 ◽  
Author(s):  
K Visakha ◽  
D Thukaram ◽  
Lawrence Jenkins
Keyword(s):  
System Stability ◽  
Real Power ◽  
Stability Margins ◽  
Power Scheduling

scholarly journals Electric Vehicles in Jordan: Challenges and Limitations

2021 ◽  
Vol 13 (6) ◽  
pp. 3199
Author(s):  
Laith Shalalfeh ◽  
Ashraf AlShalalfeh ◽  
Khaled Alkaradsheh ◽  
Mahmoud Alhamarneh ◽  
Ahmad Bashaireh
Keyword(s):  
Electric Vehicles ◽  
Distribution System ◽  
Distribution Systems ◽  
Environmental Benefits ◽  
System Stability ◽  
Loading Conditions ◽  
Stability Margins ◽  
High Penetration ◽  
Node Distribution ◽  
The Impact

An increasing number of electric vehicles (EVs) are replacing gasoline vehicles in the automobile market due to the economic and environmental benefits. The high penetration of EVs is one of the main challenges in the future smart grid. As a result of EV charging, an excessive overloading is expected in different elements of the power system, especially at the distribution level. In this paper, we evaluate the impact of EVs on the distribution system under three loading conditions (light, intermediate, and full). For each case, we estimate the maximum number of EVs that can be charged simultaneously before reaching different system limitations, including the undervoltage, overcurrent, and transformer capacity limit. Finally, we use the 19-node distribution system to study these limitations under different loading conditions. The 19-node system is one of the typical distribution systems in Jordan. Our work estimates the upper limit of the possible EV penetration before reaching the system stability margins.

Centrifugal Compressor Stability Prediction Using a New Physics Based Approach

2009 ◽  
Author(s):  
J. Jeffrey Moore ◽  
David L. Ransom
Keyword(s):  
Centrifugal Compressor ◽  
Oil And Gas ◽  
Cfd Simulation ◽  
Cost Effective ◽  
Oil And Gas Industry ◽  
New Physics ◽  
System Stability ◽  
Stability Prediction ◽  
Stability Margins ◽  
Area Of Interest

The accurate prediction of centrifugal compressor stability continues to be an important area of interest in the oil and gas industry. Ensuring stability is critical to the cost-effective installation and operation of these machines in remote environments, where field stability problems are much more expensive to diagnose and correct. Current industry standards and tools for the prediction of impeller destabilizing forces are based on empirical methods that, to date, have served fairly well for systems with reasonable stability margins. However, as stability margins are decreased, use of a modeling method that is more physics based and can better represent the observed trends in machine behavior at low stability margins is required. Furthermore, the development of mega-class Liquefied Natural Gas (LNG) compressors and ultra-high pressure reinjection compressors provides further motivation to improve accuracy. In this paper, a new physics based expression for the prediction of impeller cross-coupling, previously described by Moore, et al. [1] is further investigated by analyzing several classes and scale factors of impellers ranging from 2-D designs used in reinjection to full 3-D impellers typically used in LNG. The new expression is based on both Computational Fluid Dynamics (CFD) simulation and experimental test data from a known instability. These results are then applied to two case studies of marginally stable and unstable compressors in the field that were studied by the authors’ company. For each case study, the system stability is evaluated using both the new physics based expression as well as the more traditional empirical approaches. Comparisons are made for overall stability prediction as well as sensitivity to system changes. Conclusions are made regarding the applicability and limits of this new approach.

scholarly journals Design and Expansion Planning of Parallel Inverter Based AC Microgrids - An Approach for Improved Stability Margins

2020 ◽  
Author(s):  
Ayesha Firdaus ◽  
Marta Molinas
Keyword(s):  
Time Domain ◽  
System Stability ◽  
Value Analysis ◽  
Stability Margins ◽  
Expansion Planning ◽  
Eigen Value ◽  
Sufficient Stability ◽  
Improved Stability ◽  
The Impact ◽  
Modelling Approach

<div>This paper presents an application of impedancebased modelling approach to identify suitable locations for design<br></div>and expansion planning of an inverter based autonomous AC microgrid. The objective is to find out ideal location for placement of additional components which can include new inverter-based sources, microgrid damping controller, etc., ensuring sufficient stability margins. These objectives are achieved by first identifying the weakest and the strongest nodes in the system with respect to the system stability and then observing the effects of choosing various nodes for design and expansion on overall system stability. The weakest and the strongest nodes are identified<br>using the impedance based stability analysis of the microgrid by dividing the system in various possible partition points while the impact of choosing different locations on stability is analyzed by eigen value analysis as well as time-domain MATLAB/Simulink simulations and experimental results. <div> <br><b>This paper has been submitted to JESTPE on 25-04-2020 and rejected on 29-08-2020.</b></div>

FACT Device for Reactive Power Compensation in the Deregulated Electrical Power Environment

2015 ◽  
Vol 6 (4) ◽  
pp. 730
Author(s):  
M. Packiasudha ◽  
S. Suja
Keyword(s):  
Electricity Market ◽  
Power Flow ◽  
Fossil Fuels ◽  
Reactive Power ◽  
Electrical Power ◽  
Transmission Efficiency ◽  
System Stability ◽  
Test Case ◽  
Real Power ◽  
Inductive Type

In the deregulating electricity market, many private sector power producers are participating actively. With growing number of the wind mills and solar power generation, the reactive power production will be more because of induction generator and inductive type load. Many blackouts have happened in the past decades due to more reactive power which lead to a decrease in the magnitude of real power. It is very essential to compensate the reactive power, increase the real power flow in the transmission line, increase the transmission efficiency, improve the system stability and be in a safer place to save the fossil fuels for the future. In this paper the importance of reactive power and its various compensation techniques are applied to a five bus deregulated test case modeled and analyzed. The simulations were done using Matlab Simulink, for various FACT controllers such as STATCOM, SVC, SSSC and UPFC compensation and the results were tabulated and compared.

scholarly journals Power System Stability Enhancement using FACTS Devices

2019 ◽  
Vol 8 (4) ◽  
pp. 3497-3500 ◽  
Keyword(s):  
Power System ◽  
Control Systems ◽  
Cross Section ◽  
Power System Stability ◽  
System Stability ◽  
Real Power ◽  
Facts Devices ◽  
Imaginary Power ◽  
Stability Enhancement ◽  
Maximum Utilization

To utilize maximum cross section of installed power system conductors, the diversion of imaginary power should be must .With this; we can achieve maximum utilization of real power generated at the station. Generally preset passive inductive VAR generators may share conductor portion when low demand times. Active VAR generators are preferred to overcome this issue .Further control systems helps to determine the required VAR and type of VAR such that conduction period of switch varies according to the requirement of load which is very advantageous nature of active VAR generators. The simulink models of STATCOM and SVC are present in this paper. The results are analyzed accordingly in this paper.

scholarly journals Design and Expansion Planning of Parallel Inverter Based AC Microgrids - An Approach for Improved Stability Margins

2020 ◽  
Author(s):  
Ayesha Firdaus ◽  
Marta Molinas
Keyword(s):  
Time Domain ◽  
System Stability ◽  
Value Analysis ◽  
Stability Margins ◽  
Expansion Planning ◽  
Eigen Value ◽  
Sufficient Stability ◽  
Improved Stability ◽  
The Impact ◽  
Modelling Approach

<div>This paper presents an application of impedancebased modelling approach to identify suitable locations for design<br></div>and expansion planning of an inverter based autonomous AC microgrid. The objective is to find out ideal location for placement of additional components which can include new inverter-based sources, microgrid damping controller, etc., ensuring sufficient stability margins. These objectives are achieved by first identifying the weakest and the strongest nodes in the system with respect to the system stability and then observing the effects of choosing various nodes for design and expansion on overall system stability. The weakest and the strongest nodes are identified<br>using the impedance based stability analysis of the microgrid by dividing the system in various possible partition points while the impact of choosing different locations on stability is analyzed by eigen value analysis as well as time-domain MATLAB/Simulink simulations and experimental results. <div> <br><b>This paper has been submitted to JESTPE on 25-04-2020 and rejected on 29-08-2020.</b></div>

scholarly journals Voltage Stability Improvement By Using FACTS Elements With Economic Consideration

2015 ◽  
Vol 37 ◽  
pp. 162 ◽  
Author(s):  
Hadi Kianersi ◽  
Hamid Asadi
Keyword(s):  
Power Systems ◽  
Voltage Stability ◽  
System Stability ◽  
Stability Margins ◽  
Flexible Ac Transmission ◽  
Operation Conditions ◽  
Facts Devices ◽  
Generation Cost ◽  
Thyristor Controlled Series Capacitor ◽  
Ac Transmission

In last two decades due to increasing power demand power systems are operated to their maximum operation conditions. It will cause to any problems that one of these is voltage instability. To overcome this problem Flexible AC Transmission Systems(FACTS) have been used in power systems. The FACTS devices improves system stability, reduce losses and power generation cost. Best location of FACTS devices will help to maintain bus voltages at desired level, reduce cost of these devices and improve voltage stability margins. This paper presents the methods to location and rating of FACTS devices are optimized with using weighted coefficients method and Sterength Paretto Evolutionary Algorithm(SPEA).Thyristor controlled series capacitor(TCSC)and Static Var Compensator(SVC)are also considered in this paper.

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