2010 IEEE/PES Transmission and Distribution Conference and Exposition: Latin America (T&D-LA)最新文献

{"title":"An AHP multiple criteria model applied to transmission expansion of a Brazilian southeastern utility","authors":"E. A. A. Aranha Neto, J. Coelho, C. Camargo, A. Rodigheri, M. M. Reis, L. Cimino, R. G. Ribeiro, A. O. Reinig","doi":"10.1109/TDC-LA.2010.5762940","DOIUrl":"https://doi.org/10.1109/TDC-LA.2010.5762940","url":null,"abstract":"This paper proposes the application of a multiple criteria methodology in the implementation management of authorized or not authorized yet (by the Brazilian regulation agency) reinforcements of substations and transmission lines. The presented algorithm is capable of measuring the degree of value that each reinforcement aggregates to the company, considering the transmission agent vision, represented by a set of criteria simultaneously applied, ranking and valuing the reinforcements and thereby assisting the decision making process of the referred implementations. The adopted method is the Analytic Hierarchy Process (AHP). The developed methodology was applied to a transmission system with more than one hundred reinforcements of a Brazilian southeastern transmission utility (CTEEP), ranking and valuing the projects, thereby facilitating decision-making regarding their implementation.","PeriodicalId":222318,"journal":{"name":"2010 IEEE/PES Transmission and Distribution Conference and Exposition: Latin America (T&D-LA)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123502932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modelling of NAS energy storage system for power system applications","authors":"A. Sarasua, M. Molina, D. Pontoriero, P. Mercado","doi":"10.1109/TDC-LA.2010.5762937","DOIUrl":"https://doi.org/10.1109/TDC-LA.2010.5762937","url":null,"abstract":"At present new materials and development approaches in battery systems are aimed at replacing Lead Acid batteries, not only their common market-available forms but also, in some cases, as devices for large energy storage systems due to their better overall performance. Among these new battery types, sodium-sulphur batteries are a new practical and economical competitive solution to store large amounts of energy. They have many advantages such us the use of non-polluting components and longer life. Using power electronics, these new batteries can be used for peak saving (PS) or power quality (PQ) purposes. In either case, it is necessary to study their dynamic behaviour through a representative model. This work firstly describes the main features of sodium batteries. Then, it presents a new model developed in MATLAB/Simulink and implemented in a testing power system. Analysis and conclusions are included in the final sections.","PeriodicalId":222318,"journal":{"name":"2010 IEEE/PES Transmission and Distribution Conference and Exposition: Latin America (T&D-LA)","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129046464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of substation availability","authors":"C. K. Arruda, H. Amorim, L. A. Domingues, Ricardo C. Fonte, P. Lisboa, S. L. Zaghetto, Lidio F. A. Nascimento, Lilian F. Queiroz","doi":"10.1109/TDC-LA.2010.5762916","DOIUrl":"https://doi.org/10.1109/TDC-LA.2010.5762916","url":null,"abstract":"The paper discusses the modeling of substations for reliability, dealing with each equipment and its influence in the topology. The study consider the power availability for each load, using either an analytic and a simulation model. Some results and a software implementation are presented.","PeriodicalId":222318,"journal":{"name":"2010 IEEE/PES Transmission and Distribution Conference and Exposition: Latin America (T&D-LA)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128337697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Smart optimal control of DC-DC boost converter in PV systems","authors":"M. Elshaer, A. Mohamed, O. Mohammed","doi":"10.1109/TDC-LA.2010.5762913","DOIUrl":"https://doi.org/10.1109/TDC-LA.2010.5762913","url":null,"abstract":"Proportional integral derivative (PID) controllers are usually used to control DC-DC boost converters in PV systems. However, they have to be tuned based on certain defined operating range using averaged mathematical models. Loading conditions have great effect on PI controllers; PI controllers are subjected to failure under dramatic load changes. This limits the PI controller's operating range. Moreover, transient and steady state response both get affected by changing the operating range. This paper presents a novel smart-PID controller for optimal control of DC-DC boost converter used as voltage controller in PV systems. This proposed controller maximizes the stable operating range by using genetic algorithms (GA) to tune the PID parameters ultimately at various loading conditions. Then, a fuzzy logic approach is used to add a factor of intelligence to the controller such that it can move among different values of proportional gain (Kp), derivative gain (Kd) and integral gain (Ki) based on the system conditions. This controller allows optimal control of boost converter at any loading condition with no need to retune parameters or possibility of failure. Moreover, the paper presents a novel technique to move between the PI and PID configurations of the controller such that the minimum overshoot and ripple are obtained, which makes the controller very applicable for PV systems supplying sensitive loads. The controlled boost converter is used as an interface between photovoltaic (PV) panels and the loads connected to them. It converts any input voltage within its operating range into a constant output voltage that is suitable for load feeding. The proposed smart controller adapts the duty cycle of the boost converter based on input voltage and loading conditions such that it outputs a constant output voltage. A prototype system has been developed to verify the applicability of the proposed controller. Moreover, simulation and experimental results both confirm its validity as an effective and reliable controller for boost converters in PV systems and the possibility to use it in different applications.","PeriodicalId":222318,"journal":{"name":"2010 IEEE/PES Transmission and Distribution Conference and Exposition: Latin America (T&D-LA)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117109752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A decomposition strategy to solve the Short-Term Hydrothermal Scheduling based on Lagrangian Relaxation","authors":"F.Y.K. Takigawa, E. Finardi, E. da Silva","doi":"10.1109/TDC-LA.2010.5762957","DOIUrl":"https://doi.org/10.1109/TDC-LA.2010.5762957","url":null,"abstract":"The problem dealt here is called Short-Term Hydrothermal Scheduling - STHS. The objective of the STHS problem is to optimize the electricity production, considering a short-term planning horizon. In this problem, hydro and thermal plants must be coordinated in order to satisfy the electricity demand at the minimum cost and complying with reliability standards. Mathematically, the STHS is modeled as a deterministic, nonlinear, mixed-integer and large scale optimization problem. A Lagrangian Relaxation - LR scheme based on a variable splitting technique is proposed. By using it, the resulting separable dual problem is solved by a Bundle method. The purpose of this study is to analyze the decomposition strategy and the quality of the solution produced by the LR and the pseudo-primal point, which is calculated by active cuts of the Bundle method. A computational model is tested on a hydrothermal configuration, whose data were extracted from the Brazilian Hydrothermal power system.","PeriodicalId":222318,"journal":{"name":"2010 IEEE/PES Transmission and Distribution Conference and Exposition: Latin America (T&D-LA)","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116219278","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Consumption and demand for low voltage consumers business activity bar of Feira de Santana / Bahia","authors":"Ricardo A. M. Flor, Andre Alcantara, Pedro R. P. Dantas, M. Silveira, Andre L. C. Valente","doi":"10.1109/TDC-LA.2010.5762924","DOIUrl":"https://doi.org/10.1109/TDC-LA.2010.5762924","url":null,"abstract":"This article presents a research methodology to analyze the correlation between installed charge, monthly consumption and maximum demand of electricity in consumption units of COELBA. One goal is the recovery of non-technical energy losses by determining the typical load and demand factors of similars consumers. With the results, it is expected to improve relations between consumer utility and consumer of electricity. The development of the methodology has statistical fundament. For the dimensioning of survey samples, aspects such as geographical area, class and consumption ranges were considered, resulting in the determination of load and demand factors. The research results in estimates of consumption closer to reality when compared to values obtained by current estimates.","PeriodicalId":222318,"journal":{"name":"2010 IEEE/PES Transmission and Distribution Conference and Exposition: Latin America (T&D-LA)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116435625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of electric field enhancement along polymer insulators under service conditions","authors":"Ailton L. Souza, I. Lopes","doi":"10.1109/TDC-LA.2010.5762969","DOIUrl":"https://doi.org/10.1109/TDC-LA.2010.5762969","url":null,"abstract":"In recent years, the concerns about premature failures of polymer insulators have been increasing. These failures, in part, can be attributed to the high electric field (E-field) magnitude at end fittings of these insulators, which may lead to partial discharges activity. The E-field values recommended by manufacturers and researchers, to avoid this phenomenon, are not fully consensual yet, particularly when considering the insulator under service conditions, because the E-field can be affected by several factors. This paper analyzes the E-field along polymer insulators through computational simulations using finite element method to model the insulator and water drops. In association with the simulations laboratory, experiments were performed, where the corona voltage inception was observed. The experiments were made to reproduce moisture conditions on the insulator surface. The results clearly show how certain service conditions may increase the E-field.","PeriodicalId":222318,"journal":{"name":"2010 IEEE/PES Transmission and Distribution Conference and Exposition: Latin America (T&D-LA)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115977191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ARC SUPPRESSION COILS - The key component of modern earthfault protection systems","authors":"K. Papp, Ralf Konigi","doi":"10.1109/TDC-LA.2010.5762906","DOIUrl":"https://doi.org/10.1109/TDC-LA.2010.5762906","url":null,"abstract":"This paper gives a short overview of the alternatives for the neutral earthing of high voltage distribution systems. One approach is the resonantearthing technique which is widely used in Europe. The paper highlights the benefits of this earthing method. It describes the state-of-the-art of earthfault detection in resonant-earthed systems and proposes possible options for improvement. Finally, the arc suppression coil which is the main component for neutral earthing is described in some detail.","PeriodicalId":222318,"journal":{"name":"2010 IEEE/PES Transmission and Distribution Conference and Exposition: Latin America (T&D-LA)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116019950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unbalanced electrical distribution network reconfiguration using simulated anneling","authors":"F. A. Ferreira, F. Lemos","doi":"10.1109/TDC-LA.2010.5762965","DOIUrl":"https://doi.org/10.1109/TDC-LA.2010.5762965","url":null,"abstract":"In this article it is presented a methodology for the identification of a reconfigured topology of a distribution system in order to reestablish the energy supply to as much consumers as possible in emergency conditions. It is considered the possibility of switch operations that allow the attendance of security conditions. The approach of the problem was done considering a three-phase and unbalanced formularization of the distribution system. The problem was modeled as a nonlinear mixed integer optimization problem and solved with the heuristic called Simulated Annealing. For evaluation and validation of the methodology an example system was created and used to reproduce critical conditions normally found in real distribution systems.","PeriodicalId":222318,"journal":{"name":"2010 IEEE/PES Transmission and Distribution Conference and Exposition: Latin America (T&D-LA)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125476655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electrical requirements for half-wavelength power transmission line design","authors":"M. L. Santos, J. Jardini, M. Masuda, G. L. C. Nicola","doi":"10.1109/TDC-LA.2010.5762926","DOIUrl":"https://doi.org/10.1109/TDC-LA.2010.5762926","url":null,"abstract":"A Half-wavelength line (HWLL) is a specific type of power transmission that operates on AC power and the length of which is close to 2500 km for a 60-Hz frequency. Such a line is considered as an option for transmission over long distances. This paper proposes some electrical requirements to be met during design. Also, issues like the economic-based selection of the conductor cross section, the N-1 planning criterion compliance, the tower geometry definition and operation strategies for different load levels are discussed. Short circuit and energization simulation results are also presented. The studies were based on a 1000 kV line carrying 6000 MW.","PeriodicalId":222318,"journal":{"name":"2010 IEEE/PES Transmission and Distribution Conference and Exposition: Latin America (T&D-LA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130353713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}