University of Twente Student Theses


Behavioral models of nonlinear power consuming loads

Vugt, Pieter van (2013) Behavioral models of nonlinear power consuming loads.

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Abstract:In recent years, the increasing number of nonlinear loads on the power mains in office buildings has been known to cause problems with poor power quality and the transformers of the building getting too hot. Fixing this afterwards can be very costly. To predict and prevent these problems, it is desirable to simulate the power network with these nonlinear loads. In this report, low frequency models are developed for two kinds of nonlinear loads commonly found in office buildings. The devices under modeling (DUMs) are a Compact Fluorescent Light bulb (CFL bulb), which is a load with a rectifier bridge without power factor correction (PFC) and a switched mode power supply (SMPS) with active PFC, as commonly found in an office PC. The electrical behavior of these two devices is representative of the majority of loads in an office building. The models are low-frequency and computationally light so that many DUMs and their interaction can be simulated at once. A gray-box modeling strategy is adopted, where the structure of the input circuit looking into the DUM from the power mains is assumed to be known and is modeled in SPICE. This can be done because these input circuits are often very similar between devices. Methods of parameterizing these circuits from measurement are developed, so that in order to use the model for a different but similar DUM, no intimate knowledge is needed of its internals. The accuracy of the models is verified by comparing the output of the models with actual measurements, using clean voltage and current waveforms as well as waveforms measured at locations with poor power quality.
Item Type:Essay (Master)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:53 electrotechnology
Programme:Electrical Engineering MSc (60353)
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