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Εκτίμηση ποιότητας ισχύος βάσει καταγραφών του ΔΕΔΔΗΕ σε αναχώρηση με βιομηχανικούς καταναλωτές

Kantartzis Theodoros

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Summary

The present thesis tackles with the Power Quality issue that may arise in the Power Systems and Distribution Networks, focusing on the significance of Power Quality measurements and their analysis study in industrial customers and on the equipment that can be utilized to analyse such issues. The Industrial Area of Heraklion,Crete has been used as a case study and more specifically the potential impact of the Power Quality disorders on a typical Small Medium Enterprise (a printing Workshop) is analysed.Then actual measurements retrieved by Power Quality measuring system combined with a software system developed by Dranetz BMI company and installed on the feeder serving the Industrial Area of Heraklion are presented and discussed. The capabilities provided by the specific instrument and its software system have been presented. In addition, difficulty in the further analysis of recordings induction has been pinpointed (obscure-non-compatible) making some times such instruments very hard to use for further analysis or even discouraging the personnel using their possibilities.In order to provide a more flexible analysis of the measurememts retrieved by the specific measuring system, a user-friendly software for creating files and measurements that can be easily processed (in Excel spreadsheets) has been developed within the frame of this thesis. Using this software average values can be made very easily available.Results from the application of the aforementioned software based on actual data from the Specific feeder and Iraklio II Substation on typical days have been used. These data have compared to the current practice of typical available on the MV feeders of a substation. Currently, from the Energy Management Systems of both the Cretan Power Systems and the Distribution Network of a Substation, current measurements about the MV feeders can be made available based on spot measurements providing no additional information on the Active and Reactive Power Flow on the feeder. Regarding the High Voltage/ Medium Voltage Transformer more details can be made available. Combining the simplified average measurements from the developed software more details on the Voltage, Current, Active Power, Reactive Power, Apparent Power demand, Power Factor of the feeder in comparison to the whole transformer demand can be made available and additionally some initial estimations on Total Harmonic Distortion voltage and current can be made available.Using such an additional software can make the users even more eager to use more sophisticated tools for Analysing Power Quality events.

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