Abstract
Power quality issues have been investigated for decades, but the changes in power grid characteristics and the trend to power-electronic-coupled installations raises additional requirements and puts harmonics into the spotlight. The increasing share of distorting installations and the change of harmonic dissipation paths emphasize the need for reliable harmonic allocation methods. The methods reported in VDE-AR-N 4130 and IEC/TR 61000-3-6 do not reliably allocate harmonic emission limits and can result in harmonic voltages exceeding the planning levels. A novel approach based on non-linear constraint optimization is presented, which promises reliable allocation and the compliance to planning levels while relying on the same input data. This paper conducts a comparison of the three methods regarding their allocation performance, reliability and suitability for embedding in a power quality grid planning process. The study case is developed based on an IEC example grid. The results indicate that the novel method avoids the shortcomings of the VDE and IEC method namely under- and over-allocation as well as their significant uncertainty and may form the basis of a reliable harmonic grid planning process.
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