scholarly journals Power system analysis and integration of the proposed Nigerian 750-kV power line to the grid reliability

2021 ◽  
Vol 3 (12) ◽  
Author(s):  
Ademola Abdulkareem ◽  
T. E. Somefun ◽  
C. O. A. Awosope ◽  
O. Olabenjo
Keyword(s):  
Transmission Lines ◽  
System Analysis ◽  
Flow Analysis ◽  
Ring Structure ◽  
Load Flow ◽  
Maximum Efficiency ◽  
Contingency Analysis ◽  
Power System Analysis ◽  
Load Flow Analysis ◽  
Critical Areas

AbstractThe present situation of power generation in Nigeria obviously represents a challenge to our ability for rethinking the delivery of energy at maximum efficiency. Previous research on the existing Nigerian 330-kV network grid, recommended that the network be transformed from radial to ring because of high losses inherent in it and the voltage insecurity. In this study, the existing 330-kV network was reconfigured based on the identified regions mapped out for upgrade to form a ringed 750-kV super grid. The bus voltages of some of the buses in the existing 330-kV were upgraded to 750-kV and new transmission lines added to create an integrated super grid with a ring structure as compared to the radial nature of the existing 330-kV grid. These proposed buses have been selected for upgrade based on the fact that they are positioned in critical areas within the topology of the grid that transforms the existing radial structure to a ring one. The method is also cheaper than making the entire network a 750-kV system. Load-flow analysis was carried out on the existing 330-kV Nigerian Grid and the proposed Nigerian 750-kV integrated into the existing grid using Newton–Raphson algorithm. The results analysis of the new network revealed a significant reduction of 30.2% power loss. This was validated using the code-based MATLAB and Power World Simulation model-based software. Contingency analysis was also carried out on both grids using the Power World Simulator. The study revealed that the 750-kV super grid was able to mitigate the losses experienced on the existing grid significantly with better voltage profiles in all the buses. It also revealed that the new network (330-kV and 750-kV integrated) performed better to the single line contingency analysis with less violations occurring and no unsolvable cases.

scholarly journals Modelling of Electric Grid to Enhance Generated Power Evacuation

2021 ◽  
pp. 163-173
Author(s):  
Donald Eloebhose ◽  
Nelson Ogbogu
Keyword(s):  
Power Plants ◽  
Short Circuit ◽  
Flow Analysis ◽  
Load Flow ◽  
System Stability ◽  
Contingency Analysis ◽  
Load Flow Analysis ◽  
Electric Power Grid ◽  
Three Phase ◽  
Rivers State

The study of evacuation of power from the power plants in Rivers State Nigeria, connecting to the 330kV transmission network of the Transmission Company of Nigeria (TCN). The Power World Simulator Educational version was used in the modelling and simulation of the electric power grid. The study of load flow analysis, short circuit, transient and N-1 contingency analysis and their effect on the 330 kV/132kV transmission bus connected to the existing power plants in Rivers State Nigeria namely; Rivers IPP (180MW), Afam III (265.6MW), Afam IV & V (351.00 MW) and Afam VI G. S (650.00 MW) was carried out. From the short circuit study, it is observed that when a bus is faulted with a 3-phase fault, the three-phase voltages of the system drastically become zero in all the phases. The other buses of the network experience an increase in voltage and all the buses fed have the same effect as the bus under fault, though the effect is felt more on the buses. However, with the introduction of substation splitting at Afam III and ongoing Afam IV substations, the short circuit level will be reduced by 15%; leading to improvement in the overall system stability.

scholarly journals Enhancement of Voltage Profile by Optimal Placement of Distributed Generators with UPFC in Distribution Networks

2019 ◽  
Vol 8 (6) ◽  
pp. 2733-2738 ◽  
Keyword(s):  
Transmission Lines ◽  
Network Reliability ◽  
Distribution Network ◽  
Flow Analysis ◽  
Distribution Networks ◽  
Load Flow ◽  
Optimal Placement ◽  
Voltage Profile ◽  
Load Flow Analysis ◽  
Distributed Generators

The Distributed generation and fast operating power electronic devices are attracting more attention due to their effective solution for improvement in the voltage profile, to meet the increasing power consumption, reduction in the power loss, enhancement in the power transfer capacity of the transmission lines, reducing the overloading of the entire network. The optimal placement of DG and FACTs devices plays key role in improvement of the network reliability and voltage stability. In this paper exhaustive load flow analysis is carried out for optimal placement of DG and UPFC. The proposed method is tested on 40 bus distribution network. The obtained results are satisfactory in terms of improvement in the overall performance of the distribution network.

scholarly journals Transient stability enhancement in the presence of optimally placed D-FACTS

2020 ◽  
Vol 11 (3) ◽  
pp. 1350
Author(s):  
Omar Kamil Dahham Alazzawi ◽  
Mustafa Ahmed Nayyef ◽  
Yasir Abdulhafedh Ahmed
Keyword(s):  
Transmission Lines ◽  
Power Flow ◽  
Transient Stability ◽  
Flow Analysis ◽  
Cost Effective ◽  
Load Flow ◽  
Distribution Method ◽  
Power Flow Control ◽  
Load Flow Analysis ◽  
Stability Enhancement

<span lang="EN-US">The power flow in power system can be controlled in an effective method by using FACTS devices through transmission lines. Distributed FACTS represent a new way to overcome these drawbacks. They are cost-effective, light weighted, higher performance and minimization of environmental impact. They are placed in a distribution method and in selected lines in the network according to line flow stability indices based on load flow calculations. In this paper, distributed static series compensator (DSSC) is used in order to attain the required power flow control by modifying the line reactance. They are installed directly on the present H.V transmission lines and as a result does not require H.V insulation. The load flow analysis has been carried using mat lab and the simulation for the purpose of stability by using Power World Simulator software. The results show an enhancement in stability performances of the system over the conventional controllers. </span>

scholarly journals Load Flow Analysis of Dhaka Grid Using PSAT and ETAP and Performance Comparison to PGCB Data

2019 ◽  
Vol 18 (3) ◽  
pp. 81-87
Author(s):  
Anas Abdullah Alvi ◽  
Mohammad Abdul Mannan
Keyword(s):  
Power Systems ◽  
System Analysis ◽  
Flow Analysis ◽  
Flow Simulation ◽  
Performance Comparison ◽  
Load Flow ◽  
Base Case ◽  
Load Flow Analysis ◽  
And Performance ◽  
Shunt Capacitors

This paper deals with a load flow simulation of existing Dhaka Grid Circle of Bangladesh National Grid by using Power System Analysis Toolbox (PSAT) which is a free and open source software of MATLAB Simulink and Electrical Transient and Analysis Program (ETAP) software designed for simulation, operation, and automation of generation, distribution, and industrial power systems. All the data used to simulate were collected from Power Grid Company of Bangladesh (PGCB) and Load flow analysis was carried out using Newton Raphson method and simulated results were compared with PGCB Base Case Data. The network we are considering to simulate has 71 buses (400, 230 and 132 kV), 135 interconnecting lines, 32 generators, 47 loads and only 4 shunt capacitors as per the Dhaka grid circle system. Regarding the maximum demand of the load centers, total 5,525 MW load is connected in this system and the average grid generation in September, 2018 was 10,919.57 MW, though only 5988 MW of the total generation is enlisted in the Dhaka grid circle.

scholarly journals Contingency Analysis and Ranking of Kurdistan Region Power System Using Voltage Performance Index

2021 ◽  
Vol 5 (1) ◽  
pp. 73-79
Author(s):  
Ali Abdulqadir Rasool ◽  
Najimaldin M. Abbas ◽  
Kamal Sheikhyounis
Keyword(s):  
Power System ◽  
Transmission Lines ◽  
Performance Index ◽  
Large Scale ◽  
Flow Analysis ◽  
Severe Case ◽  
Load Flow ◽  
Kurdistan Region ◽  
Contingency Analysis ◽  
Voltage Performance

In this paper, analysis and ranking of single contingency due to the outage of transmission lines for a large scale power system of the Kurdistan Region (KR) are presented. Power System Simulator software (PSS®E33) is used to simulate the Kurdistan Region power system network and perform the contingency analysis for single line outage. This analysis is essential in order to predict and evaluate the voltage stability in case of contingency occurrence to know the most severe case and plan for managing it. All possible transmission line outages of the network are tested individually. After each branch disconnects, load flow analysis are applied by using Newton Raphson method then all bus voltages are recorded, and compared with them before the contingency. Voltage performance index is calculated for all possible contingencies to rank them according to their severity and determine the most severe contingency which is corresponding to the highest value of performance index. Also, the contingencies which cause load loss and amount of this load are observed.

Operation Characteristics of Zone 3 Distance Protection in Wind Power Systems with Fixed-Speed Induction Generators

2011 ◽  
Vol 12 (4) ◽  
Author(s):  
Shenghu Li
Keyword(s):  
Power Systems ◽  
Wind Power ◽  
Reactive Power ◽  
Flow Analysis ◽  
Load Flow ◽  
Synchronous Generators ◽  
Induction Generators ◽  
Load Flow Analysis ◽  
Wind Power Systems ◽  
Operation Characteristics

The induction generators (IGs) are basic to wind energy conversion. They produce the active power and consume the reactive power, with the voltage characteristics fragile compared with that of the synchronous generators and doubly-fed IGs. In the stressed system states, they may intensify var imbalance, yielding undesirable operation of zone 3 impedance relays.In this paper, the operation characteristics of the zone 3 relays in the wind power systems is studied. With the theoretical and load flow analysis, it is proved that the equivalent impedance of the IGs lies in the 2nd quadrature, possibly seen as the backward faults by the mho relays, i.e. the apparent impedance enters into the protection region from the left side. The undesirable operation may be caused by more wind power, larger load, less var compensation, and larger torque angle.

Load Flow Analysis for Micro Grid

2021 ◽  
pp. 177-196
Author(s):  
P. Sivaraman ◽  
C. Sharmeela ◽  
S. Elango
Keyword(s):  
Flow Analysis ◽  
Load Flow ◽  
Load Flow Analysis ◽  
Micro Grid
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