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Abstract
Power electronic circuits in modern power supplies have improved the conversion efficiency on the one hand but have also increased harmonic emissions. Harmonic currents from the operation of these units affect the voltage waveforms of the network and could compromise the reliability of the network. Load and source non-linearity can, therefore, limit the renewable source’s hosting capacity in the grid, as a large number of inverter units may increase the harmonic distortions. As a result, voltage and current distortions could reach unbearable levels in devices connected to the network. Harmonic estimation modelling often relies on measurement data, and differences may appear in mathematical simulations as the harmonic aggregation or cancellation may generate different results due to the inaccuracies and limitations of the measurement device. In this paper, the effect of harmonic currents cancellation on the aggregation of different load currents is evaluated to show its impact in the network by presenting a comparison between the measurement and mathematical aggregation of harmonics. Furthermore, the harmonic cancellation phenomenon is also qualified for multiple loads connected to the power supply.
Highlights
Hosting capacity (HC) evaluation for the inclusion of renewable energy production and storage units, including photovoltaic inverters, battery chargers, etc., is one of the tasks that must be carried out in distribution network planning
In [1], the historical outline of HC assessment is explained and the HC of low voltage networks is illustrated by increasing the number of electric vehicle (EV) chargers or photovoltaic (PV) panels [2]
[4] For example [5], ideas are presented to forecast the HC of the distribution network as they make up important tools to plan the distribution network and predict the impact on power quality due to the integration of the PV system
Summary
Hosting capacity (HC) evaluation for the inclusion of renewable energy production and storage units, including photovoltaic inverters, battery chargers, etc., is one of the tasks that must be carried out in distribution network planning. As most contemporary loads implement power electronic converters at the load side, their non-linear characteristics are a reason for feeding harmonic currents into networks This has an influence on the voltage distortion parameters of an AC power system. In a distribution network where multiple non-linear loads are connected, it is likely that the different harmonic load currents have different RMS component values and harmonic phase angle values. Harmonic voltages with different magnitudes and phase angles can cause changes in load current harmonics both in RMS and phase [14] Both the voltage and current distortions vary with different loading levels and are time-varying PQ characteristics. In [21] the aggregation result was compared to measurement data with multiple loads connected simultaneously, showing that higher-order harmonics vary more significantly than lower-order harmonics. Energies 2022, 15, 437 accounting for the cancellation would lead to pessimistic harmonic estimation, in turn leading to lower hosting capacity estimation
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