Abstract
With the introduction of more non-linear loads, e.g., compact fluorescent lamps, electric vehicles, photovoltaics, etc., the need to determine the harmonic impact of the residential load is rising, illustrated by the many studies performed on their harmonic impact. Traditionally, these studies are performed for a single new device and single penetration level, neglecting the harmonic interaction between new types of devices, as well as giving little information at which moment in time possible problems may arise. A composite approach to access the impact of harmonic sources on the distribution network is therefore proposed. This method combines a bottom-up stochastic modeling of the residential load with harmonic measurement data and harmonic load-flows all based on a scenario analysis. The method is validated with measurement data and shows a good prediction of the current level of harmonics in a residential neighborhood for the current situation. To demonstrate the applicability of the proposed method, case studies are performed on the IEEE European Low Voltage Test Feeder. These case studies show a marked difference between applying individual device-based models and a composite modeling approach, demonstrating why the proposed approach is an adequate method for the determination of the impact of new devices on the harmonics.
Highlights
Household appliances based on power electronics are increasingly connected to the distribution network due to the rapid development of semiconductor technology
The proposed approach can be applied to model the harmonic pollution from all kinds of residential loads through a bottom-up procedure, e.g., compact fluorescent lights (CFLs), electric vehicle (EV) and PV
The replacement of old devices with more efficient power electronics-based devices can in this way be taken into account for the harmonic injection modeling
Summary
Household appliances based on power electronics (non-linear loads) are increasingly connected to the distribution network due to the rapid development of semiconductor technology. A composite framework for the harmonic load modeling needs to be defined This framework should be able to include different types of harmonic sources whose penetration levels are determined by different scenarios; the aging, removing and replacement of the existed appliances (appliance development) are incorporated on the time series, and the efficiency improvement of the new connected appliances should be involved. The proposed framework builds on previous research on the modeling of the residential load [9,10] and the modeling of the harmonic sources [11] With this framework, future harmonic impact studies can be performed; and the combined effect of many harmonic sources can be assessed, and the time evolution of the level of harmonic distortion can be estimated.
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