Adaptive Neuro-Fuzzy Synchronization in Isolated Power Systems with High Wind Penetration

2016 ◽  
Vol 20 (3) ◽  
pp. 418-428
Author(s):  
Michael Negnevitsky ◽  
◽  
Dusan Nikolic ◽  
Martin de Groot ◽  
◽  
...  
Keyword(s):  
Power Systems ◽  
Diesel Generator ◽  
Synchronization Problem ◽  
Neuro Fuzzy ◽  
Harmful Emissions ◽  
Diesel Generators ◽  
The Stability ◽  
Systems Simulation ◽  
System Frequency

Isolated power systems (IPSs) worldwide are traditionally powered by diesel generators that are very expensive to run and produce harmful emissions. In order to mitigate these problems, wind turbines are being introduced into existing IPSs. Although this integration has been reasonably effective at reducing running costs and emissions, high levels of wind penetration cause large system frequency variations, resulting in a prolonged synchronization process for newly dispatched diesel generators. Long synchronization can compromise the stability of a small IPS. This paper examines the diesel synchronization problem using a real IPS as a case study and offers a solution by introducing the concept of predictive synchronization based on adaptive neuro-fuzzy systems. Simulation results demonstrate a significant reduction in diesel generator synchronization times.

scholarly journals MATLAB/SIMULINK Simulation Tool for Power Systems

2011 ◽  
pp. 140-145
Author(s):  
Santosh B. Kulkarni ◽  
Rajan H. Chile
Keyword(s):  
Power Systems ◽  
Modeling And Simulation ◽  
Test System ◽  
Simulation Tool ◽  
Matlab Simulink ◽  
Simulink Simulation ◽  
Systems Simulation ◽  
User Friendly

This paper describes the modeling and simulation library for power systems simulation under SIMULINK environment. The different features of MATLAB Toolboxes used in the analysis of power systems are described. Software introduces SIMULINK environment of MATLAB for implementing user friendly and future expansion. To illustrate the capabilities of SIMULINK simulation tool, a case study based on a test system is presented.

A SOLUTION FOR NONLINEAR STABILITY ANALYSIS OF QFT CONTROLLERS DESIGNED FOR HYDRAULICALLY ACTUATED SYSTEMS

2016 ◽  
Vol 40 (3) ◽  
pp. 265-287 ◽  
Author(s):  
Masoumeh Esfandiari ◽  
Nariman Sepehri
Keyword(s):  
Power Systems ◽  
Case Studies ◽  
Nonlinear Stability ◽  
Parametric Uncertainty ◽  
Small Signal Stability ◽  
Nonlinear Stability Analysis ◽  
Ongoing Research ◽  
First Case ◽  
The Stability

Quantitative feedback theory (QFT) is a well-established technique to design robust and linear controllers. However, the important open problem of extending the small signal stability to nonlinear stability verification has remained an ongoing research in the design of QFT controllers. In this paper, we show that Takagi–Sugeno (T–S) fuzzy modeling approach and its stability theory provide a new opportunity to study the nonlinear stability of QFT controllers in fluid power systems. To validate the approach, two case studies are provided first. The first case study establishes the reliability of the approach by confirming the results for a hydraulic system of which nonlinear stability has already been proven. The second case study establishes that using the proposed approach, we can further study and extend the stability region of previously developed hydraulic controllers to include parametric uncertainty. Followed by the successful validation of the effectiveness of our approach through these two case studies, the stability of a QFT position controller, for which the nonlinear stability was never proven, is investigated.

scholarly journals Development of hybrid photo-wind power systems with a diesel generator to overcome energy shortages

2021 ◽  
Vol 270 ◽  
pp. 01029
Author(s):  
Faez Al-Rufaee ◽  
Laythи Abd Ali ◽  
Vladimir Kuvshinov
Keyword(s):  
Power Systems ◽  
Wind Turbine ◽  
Composite Structures ◽  
Autonomous System ◽  
Renewable Energy Sources ◽  
Effective Solution ◽  
Diesel Generator ◽  
Efficient System ◽  
Diesel Generators ◽  
Wind Power Systems

The paper discusses the possibilities of using hybrid composite structures to overcome the energy shortage in Iraq, as well as the development of an efficient system of solar, wind turbine diesel generators. In this article, a Diesel Generator is combined with a wind turbine and batteries on the basis that the sun’s energy is not constant over time. The simulation was carried out using the HOMER program, which allows a detailed analysis of the volume and power of energy generated by the proposed system. The HOMER program is used for technical, economic, and environmental assessments. According to the results of the study, it was established that the most effective solution for saving electricity and overcoming energy shortages is a system consisting of renewable sources, as well as a diesel generator with batteries. The results also show that renewable energy sources used in the hybrid system provide about 69.2% of the electricity generated. This certainly improves the reliability of the electricity generated and reduces the fuel and maintenance costs of diesel generators, as well as saving the environment. The analysis of optimal systems is explained in detail to find the most achievable autonomous system.

scholarly journals Assessing a Transition to 100% Renewable Power Generation in a Non-interconnected Area: A Case Study for La R ́Eunion Island

2021 ◽  
Author(s):  
Frederic Babonneau ◽  
Stéphane Biscaglia ◽  
David Chotard ◽  
Alain Haurie ◽  
Nicolas Mairet ◽  
...  
Keyword(s):  
Power Systems ◽  
System Analysis ◽  
Production Plan ◽  
Power Network ◽  
Investment Planning ◽  
Time Step ◽  
Renewable Power ◽  
The Stability ◽  
Expansion Model

Abstract In this paper, we present a global and multi-timescale approach for assessing energy tran- sition policies aiming at fully renewable generation in power systems of non-interconnected areas, typically islands or isolated regions. The approach links together three dynamic mod- els:(i) a capacity expansion model, ETEM-SG, proposes an investment and production plan for typical days, at the horizon 2030; (ii) a simplified dispatch model is used to validate the production plan for a full year data of weather and demand variations and; (iii) a static & dynamic power system analysis is used to assess the stability of the new power network for fast occurring events like, e.g., a sudden reduction of renewable production. The proposed three-stage approach generates a least-cost long-term investment planning that ensures a supply-demand balance at an hourly time-step and power network statibility at a few mil- lisecond time scale. The presentaion is based on a case study fully described in a report [1] made with ADEME, the French Agency for ecological transition, for the French island La R ́eunion. It shows how a reliable 100% renewable power supply is reachable by 2030, in this area.

scholarly journals Optimal load dispatch strategies for a hybrid system using renewable energy sources

2021 ◽  
Vol 897 (1) ◽  
pp. 012015
Author(s):  
Ronald Ayala Ramírez ◽  
Javier Tenesaca Chacaguasay ◽  
Juan Lata García
Keyword(s):  
Power Systems ◽  
Renewable Energy Sources ◽  
Optimal Operation ◽  
Diesel Generator ◽  
Hybrid Power Systems ◽  
Software Optimization ◽  
Hybrid Microgrid ◽  
Cost Of Energy ◽  
Optimal Load

Abstract Recently, the idea of hybrid power systems (HES) has attracted interest for the electrification of isolated or energy efficient areas. This document examines the modelling and optimal dimensions of a hybrid microgrid using different dispatch strategies. The sizing of the HES components such as Photovoltaic panels, Batteries, Inverter, a Diesel generator has been optimized by three strategies: (i) load tracking, (ii) cycle load, and (iii) combined dispatch. The location of the case study is in a rural community in Ecuador whose load profile is 17 kW. By utilizing HOMER software, optimization for the HES was achieved with the Combined Dispatch strategy (CD) which presented the minimum levels in the net annual cost (NPC), initial capital, levelized cost of energy (LCOE) of $ 90,073.10, $ 21,208 and $ 0.2016 / kWh, respectively. The conclusions offer a guide to consider the resources and generation combination essential for the optimal operation of an island microgrid with different dispatch scenarios.

scholarly journals The Role of Low-Load Diesel in Improved Renewable Hosting Capacity within Isolated Power Systems

Energies ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 4053
Author(s):  
James Hamilton ◽  
Michael Negnevitsky ◽  
Xiaolin Wang ◽  
Evgenii Semshchikov
Keyword(s):  
Power Systems ◽  
Renewable Generation ◽  
Storage Requirement ◽  
Diesel Generator ◽  
Renewable Source ◽  
Low Load ◽  
Isolated Communities ◽  
Ecological Cost

Isolated communities are progressively integrating renewable generation to reduce the societal, economic and ecological cost of diesel generation. Unfortunately, as renewable penetration and load variability increase, systems require greater diesel generation reserves, constraining renewable utilisation. Improved diesel generator flexibility can reduce the requirement for diesel reserves, allowing increased renewable hosting. Regrettably, it is uncommon for utilities to modify diesel generator control during the integration of renewable source generation. Identifying diesel generator flexibility and co-ordination as an essential component to optimising system hosting capacity, this paper investigates improved diesel generator flexibility and coordination via low-load diesel application. Case study comparisons for both high- and low-penetration hybrid diesel power systems are presented in King Island, Australia, and Moloka`i, Hawai`i, respectively. For King Island, the approach details a 50% reduction in storage requirement, while for Moloka`i the application supports a 27% increase in renewable hosting capacity.

scholarly journals Investigating the faulted performance of warship power systems with integrated energy storage

2018 ◽  
Author(s):  
L Farrier
Keyword(s):  
Energy Storage ◽  
Power Systems ◽  
Power Sharing ◽  
Diesel Generator ◽  
Generator Operation ◽  
Single Generator ◽  
Fault Ride Through ◽  
University College London ◽  
Design Integration

The need to integrate energy storage systems (ESS) with warship power systems to meet future dynamic loads such as high power electric weapons is apparent. This opens up challenges with design integration of ESS with power systems and operational aspects such as steady-state, transient and faulted performance. This paper describes the integration of ESS with a candidate power system as a case study as part of an ongoing timedomain simulation investigation at University College London. The paper describes the models and power management structure of the simulation testbed, that comprises battery based ESS and diesel generators in a hybrid electric power and propulsion system. The results of two scenarios are presented, the first verifies power sharing between a diesel generator and ESS during load levelling under single generator operation, the second illustrates the ability of the ESS to provide ride through power during a generator fault on the main distribution bus. The conclusions suggest that under voltage in the candidate system outside of acceptable limits occurs during fault ride through when in single generator operation. 

Applications of random graphs

2017 ◽  
Author(s):  
A.C.C. Coolen ◽  
A. Annibale ◽  
E.S. Roberts
Keyword(s):  
Social Networks ◽  
Random Graphs ◽  
Interaction Network ◽  
Power Grids ◽  
Protein Protein Interaction ◽  
Topological Features ◽  
First Case ◽  
The Stability ◽  
Protein Protein Interaction Network

This chapter reviews graph generation techniques in the context of applications. The first case study is power grids, where proposed strategies to prevent blackouts have been tested on tailored random graphs. The second case study is in social networks. Applications of random graphs to social networks are extremely wide ranging – the particular aspect looked at here is modelling the spread of disease on a social network – and how a particular construction based on projecting from a bipartite graph successfully captures some of the clustering observed in real social networks. The third case study is on null models of food webs, discussing the specific constraints relevant to this application, and the topological features which may contribute to the stability of an ecosystem. The final case study is taken from molecular biology, discussing the importance of unbiased graph sampling when considering if motifs are over-represented in a protein–protein interaction network.

Supplier Development at LG Electronics

2020 ◽  
Author(s):  
Hyojin Kim ◽  
Daesik Hur ◽  
Tobias Schoenherr
Keyword(s):  
Management Practice ◽  
Digital Technologies ◽  
Supply Management ◽  
Future Research ◽  
Supplier Development ◽  
Environmentally Conscious ◽  
Competitive Capabilities ◽  
The Stability ◽  
Buyer Firm

Supplier development has been a critical supply management practice since the 1990s. In many instances, it has even become imperative for buyer firms to support and prepare their supply bases for uncertain economic and market environments, socially and environmentally conscious customers, advances in digital technologies, and increasing competition. Yet, research that approaches supplier development with the objective to advance all these dimensions in an integrated fashion is scarce. This study fills this void by exploring how a buyer firm may address these emerging challenges in its supply base. Specifically, an in-depth case study of LG Electronics explores how the firm designs and operates multidimensional supplier development activities to foster the stability and sustainability of its supply base while enhancing its core suppliers’ competitive capabilities. This chapter illustrates how supplier development can be taken to the next level, presents implications for managerial practice, and outlines promising future research avenues.

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