Isaque Nogueira Gondim

An Approach to Obtain System Disturbance Data to Consumer Reimbursement Analysis by Real Time Measurements

This paper is aimed at presenting and establishing a procedure to obtain system disturbance data by real site measurement to the evaluation of refunding requests for electrical damages occurred in consumer electrical appliances. The idea is to offer an alternative approach than the computational one to feed a software specially developed to provide final reports about the causal nexus between the distribution network abnormal operating conditions and the claimed reimbursement. In this way, in addition to the original way of reproducing the system phenomenon allegedly responsibly for the fact, the relationship between the occurrence and the equipment damage can now be made using real site information in terms of abnormal supply voltage waveform registers all over the disturbance period. For such, it is described a structure to measure, process, and transfer real-time information on incidents in power system, and its corresponding insertion in the aforementioned software. Experimental studies are also presented and discussed to illustrate and validate the proposal here made and a hypothetical refunding study is described to highlight the whole methodology.

Applying the Superposition Procedure for the Harmonic Sharing Responsibility between Renewable Energy Power Plants and the Network

Abstract The increasing penetration of renewable energy sources with nonlinear characteristics, such as wind and photovoltaic power plants, demands a clear procedure for harmonic sharing responsibility between this new kind of generation and the network at the point of common coupling. In fact, there are in literature many procedures regarding the determination of responsibility for violating harmonic distortion limits. Among these proposals, the methodology based on the superposition principle has been one of the most promising procedures. In this context, the present paper is focused on a procedure that applies the superposition methodology to find the harmonic sharing responsibility between a wind power plant and the utility network. To exemplify this application, a case study is performed and analyzed.

Electronic equipment dielectric and thermal withstand capability curves for refunding analysis purposes

This paper is aimed at obtaining dielectric and thermal withstand capability curves of electronic devices in order to demonstrate the allowable voltage and current effect limits. The idea is to establish a computational procedure to compare system voltage and current disturbances with the equipment tolerance permitted values to guarantee the physical integrality of the product. To highlight the methodology, new and second hand TV, stereo, personal computer units are experimentally driven to their extreme dielectric and thermal strengths. The results are then referred as tolerance curves which are used as guidelines for the computational analysis of the consistency of a given relationship between a system occurrence and the consumer claimed damage for a specific product. The applicability of the whole process can be justified by the growing interest in the establishment of systematic procedures, based on well accepted computational simulations, yielding final reports that provide the necessary answer to the refunding process demand.

A case study of electronic device modeling and performance analysis with non ideal supply conditions using ATP simulator

This paper is aimed at proposing a computational model to represent projector devices and to perform studies involving non-ideal voltage supply conditions. In order to validate the model, experimental and computational analyses are carried out to highlight the equipment behavior and the model accuracy under normal and abnormal conditions. The equipment is represented throughout a switched source with a boost converter. Although the results are related to this specific product it should be emphasized the approach could be extended to other products having similar principles. Both theoretical and experimental investigations take into account: voltage distortion, fluctuation, sag, swell and interruption.

A critical analysis of the harmonic distortion procedure applied to wind farm connection

By considering the current growth of wind power all over the world, the development of power quality studies towards the evaluation of power quality impacts of wind farm upon the electric grid has become a matter of major importance. Within this context emerges the subject of harmonic interaction between the wind farm plant and the AC commercial system to be supplied by the focused generation. In this particular field one must considerer that the harmonic distortion studies often take into account just the harmonic current injection due to the wind farm and the connection busbar presenting no previous distortions. In case of necessity, the mitigation techniques are based on passive filters design and insertion at the PCC. Due to the adopted operational condition defined by the regulation agencies only the harmonic contribution related to the wind plant are considered and this may find real site difficulties due to the possibility of other source of harmonics originated by the AC grid. Under these circumstances, the filter units may be higher loaded than expected and thermal effects may result in their components failure. With this purpose, this paper is focused on this theme. A case study is described aimed at highlighting that harmonic studies can not neglect previous harmonic distortion already existing on the system.

Two-Wire Distribution System for Power Supply to Three-Phase Rural Facilities

Nowadays, the electric power supply to rural facilities is commonly composed by single-phase medium voltage grids. Eventually, some of these rural facilities require the use of more significant driving loads, making necessary the replacing of the single-phase networks by a new medium voltage three-phase network. Thus, despite the fact it is a new or an existing facility, the construction costs related to a new medium voltage three-phase grid, which may have some miles long, could cripple investment to be made by the farmer as well as increase utility tariffs due to higher costs of the three-phase distribution networks in rural areas. In this context, this paper presents an innovative and low cost power supply to attend three-phase rural facilities through a new two-wire distribution system.

A Computational Methodology to Support Reimbursement Requests Analysis Concerning Electrical Damages

Abstract In light of the growing number of reimbursement requests processed from consumers for electrical damage to equipment, supposedly caused through the manifestation of anomalies on the power grid, there comes the need for reliable means for providing a decision on the issues highlighted herein. Through the recognition that in the current context, the procedures used are based on reviews, information and records of occurrences in the field, there has been significant inadequacy and fragility in the issuing of conclusive advice or opinions. In particular, the search for mechanisms grounded in classical principles and accepted in electrical engineering presents itself as an important challenge on which to base the decision making process in full awareness of its incumbent science and technology. Therefore, with the aim of meeting these assumptions, the study in question excels in its presentation of the principles that guided the software analysis, which intend above all else to correlate cause and effect. The elaborated strategy involves modelling stages as well as studies aimed at: distribution supply reproduction; characterization of the distribution network to the complainant consumer; representation of the diverse electro-electronic appliances and lastly, a proposal for correlating the disturbances impacting on equipment with their dielectric and thermal supportability requirements. For the purpose of illustrating the software process, an actual case study coupled with a loss and claim scenario is presented.

Computational Reimbursement Request Analysis: Ground Model Impacts

This paper presents computational results of the grounding systems modeling influence on the reimbursement request analysis. The main idea consists in developing a practical way of tackling the subject of the relationship between electrical network strokes and consumer equipment damages. This investigation of the casual nexus is relevant when reimbursement requests are involved. Based on a non-linear approach methodology a modified model is proposed and implemented in a given computational program aimed at evaluating the consistence between abnormal operating conditions and equipment dielectric and thermal withstand limits. Using a typical distribution system, studies are carried out using the aforementioned representation of grounding systems in order to highlight the importance of providing a more realistic ground representation.

Air conditioner ATP time domain model and validation focusing reimbursement requests associated with system disturbances

This paper is aimed at proposing and validating a time domain model for window-type air conditioner apparatus and corresponding insertion in the ATPDraw platform. The suggested computational model performance exactness is evaluated through comparison of simulation and experimental results with ideal and non-ideal supply voltage conditions. Once the representation effectiveness is proven, the model is then implemented in a more comprehensive program developed to cope with the dielectric and thermal relationship between system disturbances and appliances supportability limits. This tool has been developed so as to provide a scientific and systematized way of analyzing consumer refunding demands to equipment damages eventually attributed to distribution system occurrences. A practical study is then carried out to highlight the overall software application considered here.