Abstract
AbstractIn this paper the grid current higher harmonic compensation method for two level AC-DC converters in sustainable AC grid is described. The algorithm is based on Direct Power Control with Space Vector Modulator (DPC-SVM), which was extended by additional Higher Harmonics Compensation (HHC) module. The HHC block is composed of several resonant filters tuned to appropriate frequencies. Both, symmetrical and asymmetrical types of grid currents distortions are analyzed. Operation of the HHC module in stationary αβ coordinates and rotating dq coordinates is discussed. Selected waveforms illustrating operation of the developed algorithm are presented. It is shown that in dq coordinates asymmetrical voltage distortions needs additional effort for its compensation in comparison to symmetrical higher harmonics. The subject is important because in practice asymmetrical higher harmonics usually can appear when one phase nonlinear load is connected to the grid. Even within such conditions the grid connected ACDC converter (GCC) should provide sinusoidal-like current. This assumption provides the reduction of negative impact of the GCC in power quality in Point of Common Coupling (PCC) in sustainable AC grid
Highlights
In recent years there have been several issues related to sustainable future Electrical Grids that should be taken into consideration
Only the higher harmonic compensation will be presented. Because this subject is quite well described in the literature [2], [3], [4] in this paper the analysis of higher harmonics distortion will be extend to the case of the asymmetrical deformation caused by a single phase load connected to Point of Common Coupling (PCC)
In the sustainable grid the asymmetrical higher harmonics can appear even more often than symmetrical ones because the number of one phase loads is higher than three phase ones
Summary
In recent years there have been several issues related to sustainable future Electrical Grids that should be taken into consideration. It has to be stressed that AC grid will be improved i.e. its reliability, power quality and controllability Taking this into account, power electronics AC-DC converter control should provide a lot of functions in sustainable energy conversion systems. Because the number of Renewable Energy Sources (RES) are continuously growing it is important to improve the control methods related with grid connected AC-DC converters (GCC). This control can assure more stable operation of GCC converters and it can improve the current quality (indirectly grid voltage quality) in Point of Common Coupling (PCC) distorted by single phase nonlinear loads.
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