scholarly journals Operational Impact of RES Penetration on a Remote Diesel-Powered System in West Papua, Indonesia

2018 ◽  
Vol 8 (3) ◽  
pp. 2963-2968 ◽  
Author(s):  
M. L. Tuballa ◽  
M. L. S. Abundo
Keyword(s):  
Transient Stability ◽  
Short Circuit ◽  
Flow Analysis ◽  
Load Flow ◽  
Circuit Breakers ◽  
Transmission Grid ◽  
Load Flow Analysis ◽  
Remote Island ◽  
Tidal Turbine ◽  
Short Circuit Analysis

When a new power source connects to the distribution or transmission grid, an assessment of its impact is necessary. Technical studies must assess the possible effects of a proposed expansion, reinforcement or modification to evaluate the possible incidents that may occur. Typically, the calculations or analyses done are load flow, short-circuit, and transient stability. The possible renewable energy (RE) sources are determined first. The details of the existing electrical system, including the specifications for the elements used, are obtained and logical assumptions are utilized for those that are not known. The load flow analysis in the considered case revealed that the RE presence reduces diesel generation. The 119 kW PV array and the 54 kW tidal turbine displace most diesel generation: 22% of Gen 4 and 21.8% of Gen 5. The diesel-solar system brought the diesel generation down by 20.05% of Gen 4 and 20% of Gen 5. The diesel-tidal combination lessened the diesel generation by 1.92% of Gen 4 and 1.83% of Gen 5. Short-circuit analysis alerts indicating the operating percentages of the circuit breakers that are beyond their interrupting ratings are presented. The transient stability analysis depicts that RE sources affect the existing system and appear to be putting in more stress. The studied systems are not transient-stable based on the results. While it is relatively simple to plan to put up renewables in remote island systems, there are many factors to consider such as the possible impacts of the RE sources.

scholarly journals Design and Stability Analysis of a proposed Microgrid for on Campus Diesel and Photovoltaic Power Sources

2021 ◽  
Vol 58 (1) ◽  
pp. 47-60
Author(s):  
Muhammad Iftikhar Khan ◽  
Muhammad Amir
Keyword(s):  
Transient Stability ◽  
Short Circuit ◽  
Flow Analysis ◽  
Energy Resource ◽  
Load Flow ◽  
Power Sources ◽  
Pv Systems ◽  
Load Flow Analysis ◽  
Small Load ◽  
Low Efficiency

Pakistan is currently facing an energy crisis that is detrimental to its growth. Due to persistent load shedding by the National Grid throughout the country, the latest trend is tilting towards generating power at localized level through a mix of renewable and conventional energy sources. Such a mixture is referred to as Distributed Energy Resource (DER). Part of such a DER (i.e. solar energy) is free as naturally and mostly available in Pakistan having no degradation problem while providing benefit to the locality. The idea of using a Microgrid for our local power needs morphed accordingly. In this paper, a Microgrid design for our local campus i.e. University of Engineering & Technology, Peshawar, KPK is proposed. Our campus generators are not interconnected. Consequently, even while servicing small load periods, all of our campus’s diesel generators run at full capacity at the same time. Such a behavior is uneconomical, unacceptable and the generators run at low efficiency during islanding from the main utility grid. It is seen that behavior as such is endemic throughout Pakistan. Through design and analysis, it is proposed that if a Microgrid of such unconnected resources on campus is formed then during islanding, all generators and our Photovoltaic (PV) systems will economically and efficiently feed their common loads through load sharing. Synchronization, load flow analysis, short circuit analysis, harmonic analysis, transient stability, cost and reliability of our proposed Microgrid is analyzed using ETAP (Electrical Transient Analyzer Program) in this paper.

scholarly journals RANCANGAN SISTEM SUPLAI DAYA DARURAT PADA PLTG TANJUNG UNCANG 2X35 MW

2020 ◽  
Vol 6 (1) ◽  
pp. 420-430
Author(s):  
Ali Mashar ◽  
Siti Saodah ◽  
Achmad Maulana Fathi
Keyword(s):  
Short Circuit ◽  
Flow Analysis ◽  
Load Flow ◽  
Circuit Analysis ◽  
Analysis Program ◽  
Diesel Generator ◽  
Load Flow Analysis ◽  
Short Circuit Analysis

Pada sebuah pembangkit listrik terdapat peralatan - peralatan vital tambahan (auxiliary load) yang tidak dapat terputus suplai dayanya baik dalam keadaan normal maupun  dalam keadaan darurat (suplai daya dari generator utama terputus). Sistem suplai daya darurat merupakan sistem yang bertugas mensuplai daya pada beban vital tambahan ketika keadaan darurat (emergency). Komponen utama dari sistem suplai daya darurat adalah Emergency Diesel Generator (EDG) berfungsi sebagai pensuplai daya pada sistem tersebut. Besarnya rating daya dari EDG ditentukan dari jumlah beban vital tambahan yang akan disuplai. Berdasarkan pertimbangan kebutuhan daya bebannya,  spesifikasi EDG yang digunakan pada PLTG Tanjung Uncang 2x35 MW adalah 1225 kVA dengan tegangan nominal 6,6 kV, frekuensi 50 Hz dan PF 0,8. Electric Transient and Analysis Program (ETAP) digunakan untuk memverifikasi data beban vital tambahan dan untuk melakukan simulasi load flow dan short circuit pada sistem. Simulasi load flow analysis dilakakan untuk mengetahui aliran daya yang mengalir pada jaringan, sedangkan short circuit analysis dilakukan untuk melihat arus gangguan yang  mengalir ketika terjadi short circuit (hubung singkat). Dari simulasi load flow analysis didapatkan bahwa daya yang mengalir dari generator menuju jaringan sebesar 754 kW. Dari simulasi short circuit analysis didapatkan jika Bus LV1 terjadi gangguan 3-phase fault 1.631 kA, jika sumber kegagalan terjadi pada Bus LV2 -G 1.222 kA. Sedangkan, jika sumber kegagalan terjadi pada Bus MV1 L-L 0.313 kA, jika sumber gangguan terjadi pada Bus MV2 L-L-G 0.260 kA dan jika sumber kegagalan terjadi pada Bus DC sebesar 5.342 kA.

An Educational Software Package for Power Systems Analysis and Operation

2005 ◽  
Vol 42 (4) ◽  
pp. 369-382 ◽  
Author(s):  
T. Yalcinoz
Keyword(s):  
Power Systems ◽  
Systems Analysis ◽  
Software Package ◽  
Transient Stability ◽  
Educational Software ◽  
Unit Commitment ◽  
Flow Analysis ◽  
Load Flow ◽  
Fault Analysis ◽  
Load Flow Analysis

This paper presents a software package developed in Matlab for teaching power systems analysis and operation. The software package is used to support and enhance power engineering education at both undergraduate and postgraduate levels. The application programs in this package include fault analysis, load flow analysis, transient stability, economic dispatch, unit commitment and load forecasting. All modules of the package are independent of each other. The students or researchers can make copies of the software to study and can modify any module of the package.

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 Impact of large photovoltaic power penetration on the voltage regulation and dynamic performance of the Tunisian power system

2020 ◽  
Vol 38 (5) ◽  
pp. 1774-1809
Author(s):  
Abdelaziz Salah Saidi
Keyword(s):  
Power System ◽  
Short Circuit ◽  
Dynamic Performance ◽  
Flow Analysis ◽  
Flow Simulation ◽  
Voltage Regulation ◽  
Load Flow ◽  
Grid Systems ◽  
Transmission Grid ◽  
Photovoltaic Power

By the year 2023, the Tunisian power transmission grid has been projected to include photovoltaic pool of power of 937 MW, scattered throughout the whole landscape of the nation. This paper investigates high photovoltaic energy penetration impacts voltage regulation and dynamic performance of the grid. Load flow analysis is implemented to investigate the power system capability for the case of incorporating the desired photovoltaic power. Computer-based simulations have been used for evaluating the upgradation of the grid. Moreover, the study is based on bifurcation diagrams taking the photovoltaic generation as a bifurcation parameter and time response simulations to grid disturbances. Professional PSAT simulation toolbox has been used for the power flow simulation studies. Network- related faults like outage of photovoltaic farm event, three-phase short-circuit at a conventional bus, and voltage dip at the largest photovoltaic station have been considered. It is hoped that the results of the presented study would benefit Tunisian’s utility’s policies on integration of PV systems. Moreover, this comprehensive analysis and study will be a valuable guide for assessing and improving the performance of national grid systems of any other countries also, that gives the huge potential and need for solar energy penetration into the grid systems.

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 Evaluation of the Impact of High Penetration Levels of PV Power Plants on the Capacity, Frequency and Voltage Stability of Egypt’s Unified Grid

Energies ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 552 ◽  
Author(s):  
Hamdy Sultan ◽  
Ahmed Diab ◽  
Oleg Kuznetsov ◽  
Ziad Ali ◽  
Omer Abdalla
Keyword(s):  
Power Plants ◽  
Voltage Stability ◽  
Short Circuit ◽  
Flow Analysis ◽  
Frequency Stability ◽  
Load Flow ◽  
Transmission Network ◽  
Load Flow Analysis ◽  
High Penetration ◽  
The Impact

In this paper, the impact of integrating photovoltaic plants (PVPs) with high penetration levels into the national utility grid of Egypt is demonstrated. Load flow analysis is used to examine the grid capacity in the case of integrating the desired PVPs and computer simulations are also used to assess the upgrading of the transmission network to increase its capacity. Furthermore, the impact of increasing the output power generated from PVPs, during normal conditions, on the static voltage stability was explored. During transient conditions of operation (three-phase short circuit and outage of a large generating station), the impact of high penetration levels of PVPs on the voltage and frequency stability has been presented. Professional DIgSILENT PowerFactory simulation package was used for implementation of all simulation studies. The results of frequency stability analysis proved that the national grid could be maintained stable even when the PVPs reached a penetration level up to 3000 MW of the total generation in Egypt. Transmission network upgrading to accommodate up to 3000 MW from the proposed PV power plants by 2025 is suggested. In addition, analysis of voltage stability manifests that the dynamic behavior of the voltage depends remarkably on the short circuit capacity of the grid at the point of integrating the PVPs.

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