Generating a PSS™NETOMAC model of the German Transmission Grid from Google Earth and visualizing load flow results

2014 ◽  
Author(s):  
Sascha Altschaffl ◽  
Rolf Witzmann ◽  
Thomas Ahndorf
Keyword(s):  
Load Flow ◽  
Google Earth ◽  
Transmission Grid

scholarly journals Implementation of a Dynamic Network Model of the Nigerian Transmission Grid for Investigations on Power System Stability

2019 ◽  
Author(s):  
Kosisochukwu Pal Nnoli
Keyword(s):  
Power System ◽  
Dynamic Models ◽  
Model Performance ◽  
Dynamic Network ◽  
Modern Society ◽  
Electrical Energy ◽  
Load Flow ◽  
System Stability ◽  
Power Network ◽  
Transmission Grid

Electricity is the backbone of any modern society and economy. Therefore, economic growth and an increase in social wealth of a country usually lead to an increase in demand for electrical energy especially for a country as Nigeria. As the population of Nigeria is increasing exponentially, there exists a need to make basic needs constantly available, for the wellbeing of the increasing population. This is possible through mechanization. Reliable and stable electricity supply is the surest means to this end. As a result, there is a need to constantly review the dynamics of the power system while more energy sources and loads are being added to the existing power network grid. This creates a demand for precise models for the corresponding network. In this paper, the power network system of the Nigerian transmission grid was implemented at normal operations to include the dynamic models to the corresponding network elements (i.e. generation Units based on their installed capacities and controllers). With the help of this model, stationary load flow calculations, as well as the network’s model performance in steady state was conducted. The network’s model performance in the case of load changes and fault operations was also carried out. These allowed for investigations on the stability status of the Nigerian transmission grid.

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 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 Voltage Stability Evaluation in the Nigeria 44 Bus Grid Network using Modal Analysis

2021 ◽  
pp. 80-89
Author(s):  
E. N. Aneke ◽  
B. E. Ibekwe ◽  
J. C. Iyidobi ◽  
E. N. C. Okafor
Keyword(s):  
Modal Analysis ◽  
Voltage Stability ◽  
Negative Real Part ◽  
Load Flow ◽  
Voltage Profile ◽  
Steady State Mode ◽  
Voltage Level ◽  
Transmission Grid ◽  
Grid Network ◽  
Ieee Standard

This paper focused on the application of modal analysis method to determine the voltage stability of the Nigeria 44 bus 330kV transmission grid network and to determine the network’s weakest buses. Modal method calculates the smallest eigenvalue and all the associated eigenvectors of the reduced Jacobian matrix, JR using steady state mode. The network model was developed in PSAT-MATLAB and load flow was performed on the network. Results and analysis showed that the Nigeria 44 Bus grid network was found to be unstable as the modal analysis revealed the presence of eigenvalue with a negative real part. Gombe, Damaturu and Yola buses were also discovered to be the vulnerable buses since their voltage profile fell below the IEEE standard voltage level of (0.95-1.05) pu. Yola bus was spotted as the weakest bus based on the analysis of the participating factors.

scholarly journals Probabilistic Load Flow Approach Considering Dependencies of Wind Speed, Solar Irradiance, Electrical Load and Energy Exchange with a Joint Probability Distribution Model

Energies ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1727
Author(s):  
Marie-Louise Kloubert
Keyword(s):  
Wind Speed ◽  
Solar Irradiance ◽  
Energy Exchange ◽  
Joint Probability ◽  
Load Flow ◽  
Joint Probability Distribution ◽  
Electrical Load ◽  
Transmission Grid ◽  
Probabilistic Load Flow ◽  
Probabilistic Load

The modelling of stochastic feed-ins and demands becomes essential for transmission grid operation and planning due to the extension of renewable energy sources (RES). Neglecting the correlation between uncertain variables and/or oversimplifying the distribution through the assumption of Normal distributions leads to the inaccurate determination of future network states. Therefore, the uncertainties need to be accurately modelled in order to be used in a probabilistic load flow approach. This paper analyses the characteristics of wind speed and solar irradiance for different locations throughout countries and models the dependencies between them. In addition, the total electrical load and the energy exchange between neighbouring countries are analysed. All of these uncertainties are modelled together in a high-dimensional joint probability distribution using pair-copula constructions. The model is applied to generate samples and determine the probability of extreme events, e.g. high RES production and low demand. The probability for rather high load (>65 GW) and low RES production with wind speed less than 3 m/s and solar irradiance less than 100 W m ² at 90% of all stations is e.g. 0.064%. In addition, the model is integrated in a probabilistic load flow approach in order to analyse the German transmission grid for a future scenario of the year 2025. With the copula, samples are generated as an input for the Monte Carlo simulation approach. The approach enables the assessment of planned HVDC lines. When considering the HVDC lines, the load on the AC lines can be significantly reduced.

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