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This paper involves the development of a dynamic model for a resonant dc-dc converter topology recently proposed at the University of Toronto. The model makes use of the conservation of energy principle. This dynamic model employs an averaging technique, since converter switching is neglected. A simple test network for validation of the proposed model is developed. Based on the validated model, a...
Different configurations and transmission technologies regarding the geographic distances and the expansion of the electrical system in large countries can be proposed. These technologies must meet the technical criteria considering the minimal cost. The minimal cost solution aims at bringing low tariffs to the final consumer. Accordingly, this paper will present the assessment of the economic limit...
This paper presents a strategy for sizing both an electric motor and battery pack for an automotive electric vehicle, given a specific route and function. In this case, the vehicle will be used to gather recyclable material on the Campus Darcy Ribeiro, University of Brasilia, Brazil, covering a course given by the location of the collection containers. To apply this strategy, a load and inclination...
The main objective of this article is to propose a methodology for prioritizing actions in predictive maintenance substation equipment, applied to Power Transformers, which are eventually responsible for the income revenue of energy companies (generation, transmission and distribution). This is a reflection on the failure analysis and risk management with optimal use of predictive maintenance, to...
The primal-dual interior point method is developed for the generation and transmission loss problem minimization of the DC power flow hidrotermic system considering power reservation constraints in a subset of generating units. The resulting matrix structure is exploited aiming at an efficient implementation. Case studies are performed using the IEEE30, IEEE118 and brasilian power systems.
This paper presents an optimization tool based on Genetic Algorithms, DAC-CMAG (Automatic Load Shedding Calculated Through Genetic Algorithms), developed in Matlab and applied to the calculation of load shedding in Electric Power Systems. This application calculates the optimal load shed necessary to eliminate overloading of any series element of an electrical network. It includes a module that runs...
A full power flow model has been used to analyze, operate, and plan power systems in the steady state. This model enables the active and reactive power flow to be analyzed and planned. With a DC power flow model, an approximated solution can be reached which minimizes the power flow in transmission lines. A method that has been used in recent years for optimization problems is the evolutionary algorithm...
With increasing wind-power penetration, new types of generators are introduced in the power systems and their impact over the voltage stability must be analyzed. This paper is concerned with the effectiveness of voltage stability index in providing information about the proximity to instability of a power system that includes a doubly-fed induction generator (DFIG). The study is carried out over a...
This paper presents the steady state analysis of the interconnection of a large Wind Farm (400 MW) to the Brazilian National Grid. Several contingency cases have been simulated to ensure the n−1 reliability standard. Different connection points are analyzed and an economic assessment is developed. All simulations considered the 2015 scenario, when the wind farm should start generation.
The deployment of advanced metering infrastructure has already started in many countries around the world in order to facilitate the transition towards low-carbon economies, to improve electricity billing, to decrease distribution network operational costs, and to empower householders. In addition, the adoption of photovoltaic panels, electric vehicles and smart appliances, already being encouraged...
The grid expansion is the most usual alternative to increase the coverage of distribution utility in rural areas. However, this alternative has several constraints related with its costs, the dispersion of costumers, assets configuration (mostly radial), and reliability, among others. This paper summarizes the main issues concerning to supply the energy demand in rural areas. Technical and economic...
This paper describes a methodology for improving voltage profile for power transmission systems. Basically, it consists in tuning the transformers' taps in a way that the buses voltages in the same area would stay around the same level. This approach was built focusing Brazil's national integrated power system which is extremely regulated and centralized. This methodology uses a Genetic Algorithm...
The purpose of this paper is to analyze the small signal stability of the Uruguayan power system on a short to medium term according to the scenarios for the years 2013–2017, in which the transmission network will undergo major changes: first, the inclusion of large quantities of wind power and secondly, the implementation of major infrastructure projects including the construction of the 500kV line...
The objective of this paper is to present an evaluation related to the possible application of the Feed-in and Net metering tariffs into microgrid systems. Microgrid systems are currently among the options considered to support the network especially during periods of blackout. Critical loads in various areas (e.g. military bases, health centers, nuclear installations, etc) operate already under a...
The development of Smart Grids, which has taken considerable momentum and efforts, is underway to implement rapidly systems that materialize concepts, that only few years ago were only ideas about how to develop a new electrical infrastructure with benefits for all actors and in particular for the end users. A number of projects that are underway do classify as Smart Grids but some rather implement...
Both technical and institutional changes suggest the need for more decentralized tools for estimation, control, and operation in wide area power system. The paper's aim is to coordinate the operation of several networks with purposes of networks' security preservation, based on decentralized strategies. The approach is formulated as an optimization problem, where the grid is split into control areas;...
Small renewable distributed generation and plug-in electric cars are new trends on distribution networks which are increasing due to the necessity of providing an increasing amount of energy to match demand in a sustainable way and decrease oil dependence in transportation sector. Those new technologies are related because PEV increasing would facilitate renewable power penetration in distribution...
Every time stator winding maintenance is to be done, hydro generator field poles are parts that are taken out/in on the rotor rim, being a high risk operation, as the field pole are a fragile piece of the generator, risking a pole damage. Repair a damaged field pole can take take months if the damage is a mayor one, and has to be done overseas at foreign contractor workshops, so to have spare parts...
This paper examines the small signal stability problem and proposes a methodology for understanding how the generation dispatch and tie line power flow affect the inter area mode damping. The proposed methodology applies numerical sensitivity analysis. Mode sensitivity is achieved by considering three different systems evaluated under different operating conditions. The analysis carried out in this...
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