Power flow model/calculation for power systems with multiple FACTS controllers

2007 ◽  
Vol 77 (12) ◽  
pp. 1521-1531 ◽  
Author(s):  
Ghadir Radman ◽  
Reshma S Raje
Keyword(s):  
Power Systems ◽  
Model Calculation ◽  
Power Flow ◽  
Flow Model ◽  
Facts Controllers

scholarly journals Intelligent stability margin improvement using series and shunt controllers

2021 ◽  
Vol 10 (4) ◽  
pp. 281
Author(s):  
Mahdi Karami ◽  
Norman Mariun ◽  
Mohd Amran Mohd Radzi ◽  
Gohar Varamini
Keyword(s):  
Power Systems ◽  
Power System ◽  
Power Flow ◽  
Stability Margin ◽  
Alternate Current ◽  
Critical Issue ◽  
Number Representation ◽  
Facts Devices ◽  
Facts Controllers ◽  
The Stability

Electric market always prefers to use full capacity of existing power system to control the costs. Flexible alternate current transmission system (FACTS) devices introduced by Electric Power Research Institute (EPRI) to increase the usable capacity of power system. Placement of FACTS controllers in power system is a critical issue to reach their maximum advantages. This article focused on the application of FACTS devices to increase the stability of power system using artificial intelligence. Five types of series and shunt FACTS controllers are considered in this study. Continuation power flow (CPF) analysis used to calculate the collapse point of power systems. Controlling parameters of FACTS devices including their locations are determined using real number representation based genetic algorithm (RNRGA) in order to improve the secure margin of operating condition of power system. The 14 and 118 buses IEEE standard test systems are utilized to verify the recommended method. The achieved results manifestly proved the effectiveness of proposed intelligent method to increase the stability of power system by determining the optimum location and size of each type of FACTS devices.

scholarly journals Fast Heuristic AC Power Flow Analysis with Data-Driven Enhanced Linearized Model

Energies ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3308
Author(s):  
Xingpeng Li
Keyword(s):  
Power Systems ◽  
Power System ◽  
Power Flow ◽  
Flow Model ◽  
Reactive Power ◽  
Unit Commitment ◽  
Flow Analysis ◽  
Data Driven ◽  
Dc Power ◽  
Ac Power

Though the full AC power flow model can accurately represent the physical power system, the use of this model is limited in practice due to the computational complexity associated with its non-linear and non-convexity characteristics. For instance, the AC power flow model is not incorporated in the unit commitment model for practical power systems. Instead, an alternative linearized DC power flow model is widely used in today’s power system operational and planning tools. However, DC power flow model will be useless when reactive power and voltage magnitude are of concern. Therefore, a linearized AC (LAC) power flow model is needed to address this issue. This paper first introduces a traditional LAC model and then proposes an enhanced data-driven linearized AC (DLAC) model using the regression analysis technique. Numerical simulations conducted on the Tennessee Valley Authority (TVA) system demonstrate the performance and effectiveness of the proposed DLAC model.

scholarly journals A New DC Model for Transmission Loss Allocations in Power Systems

1970 ◽  
Vol 42 (3) ◽  
pp. 257-268
Author(s):  
MH Kabir
Keyword(s):  
Power Systems ◽  
Power Flow ◽  
Flow Model ◽  
Transmission Loss ◽  
Load Flow ◽  
Loss Allocation ◽  
Line Flow ◽  
Transmission Loss Allocation ◽  
The Impact ◽  
Linear Nature

Under open access environment in the era of deregulated power industry, transmission loss allocation to various transactions is one of the important issues to be solved exactly. Because of the non-linear nature of power flow and power loss, it is very difficult to segregate and to allocate losses among the participants properly. This paper presents a New DC method (NDC) where an efficient loss allocation algorithm has been applied. Considering the impact of every line flow in a network, the loss allocations to the loads have been computed at first and finally the total loss has been allocated to the generators. The effectiveness of this procedure has been studied for the 6-bus and IEEE 118-bus model power systems. Several numerical analyses implicate that the proposed loss allocation procedure including the DC load flow model is reasonably acceptable. Keywords: Transmission loss allocation DC load flow model, Deregulated power market Bangladesh J. Sci. Ind. Res. 42(3), 257-268, 2007

scholarly journals Effect of DC Link Control Strategies on Multiterminal AC-DC Power Flow

2015 ◽  
Vol 2015 ◽  
pp. 1-15 ◽  
Author(s):  
Shagufta Khan ◽  
Suman Bhowmick
Keyword(s):  
Power Systems ◽  
Control Strategy ◽  
Power Flow ◽  
Flow Model ◽  
Control Strategies ◽  
Test System ◽  
Sequential Method ◽  
Dc Power ◽  
Flow Convergence ◽  
Newton Raphson

For power-flow solution of power systems incorporating multiterminal DC (MTDC) network(s), five quantities are required to be solved per converter. On the other hand, only three independent equations comprising two basic converter equations and one DC network equation exist per converter. Thus, for solution, two additional equations are required. These two equations are derived from the control specifications adopted for the DC links. Depending on the application, several combinations of valid control specifications are possible. Each combination of a set of valid control specifications is known as a control strategy. The number of control strategies increases with an increase in the number of the DC terminals or converters. It is observed that the power-flow convergence of integrated AC-MTDC power systems is strongly affected by the control strategy adopted for the DC links. This work investigates the mechanism by which different control strategies affect the power-flow convergence pattern of AC-MTDC power systems. To solve the DC variables in the Newton-Raphson (NR) power-flow model, sequential method is considered in this paper. Numerous case studies carried out on a three-terminal DC network incorporated in the IEEE-300 bus test system validate this.

Absorption of oxygen into Ellis liquid

1987 ◽  
Vol 52 (12) ◽  
pp. 2859-2864
Author(s):  
František Potůček ◽  
Jiří Stejskal
Keyword(s):  
Aqueous Solutions ◽  
Power Flow ◽  
Flow Model ◽  
Poly Acrylamide

The authors studied absorption of oxygen by aqueous solutions of poly(acrylamide) which showed a pseudoplastic behaviour. The results were described by equations involving dimensionless criteria modified for the Ellis flow model. The equations were compared with those published for the power flow model.

scholarly journals Dynamic grid fault analysis in wind power plant with DFIG by using supervisory control and data acquisition (SCADA) viewer

2020 ◽  
Vol 181 ◽  
pp. 03006
Author(s):  
Nduwamungu Aphrodis ◽  
Ntagwirumugara Etienne ◽  
Utetiwabo Wellars ◽  
Mulolani Francis
Keyword(s):  
Power Systems ◽  
Power Flow ◽  
Control Strategies ◽  
Electrical Power ◽  
Fault Analysis ◽  
Operational Mode ◽  
Electrical Power Systems ◽  
Fault Ride Through ◽  
Before And After ◽  
Clearing Time

Faults in electrical power systems are among the key factors and sources to network disturbances, however control strategies are among key faults clearing techniques for the sake of safe operational mode of the system.Some researchers have shown various limitations of control strategies such as slow dynamic response,inability to switch Off and On network remotely and fault clearing time. For a system with wind energy technologies, if the power flow of a wind turbine is interrupted by a fault, the intermediate-circuit voltage between the machine-side converter and line-side converter will fall in unacceptably high values.To overcome the aforementioned issues, this paper used a Matlab simulations and experiments in order to analyze and validate the results.The results showed that fault ride through (FRT) with SCADA Viewer software are more adaptable to the variations of voltage and wind speed in order to avoid loss of synchronism. Therefore at the speed of 12.5m/s a wind produced a rated power of 750W and remained in synchronization before and after a fault created and cleared but worked as generator meanwhile at speed of 3.4m/s wind disconnected from grid and started working as a motor and consumed active power (P=-25watts) and voltage dip at 100% .For the protection purpose, the DC chopper and crowbar should be integrated towards management of excess energy during faults cases.

Sign in / Sign up

Export Citation Format

Share Document