Abstract
This paper gives different control mechanisms comparison for active rectifiers fed grid connected 3-phase distributed generation systems from non-conventional energy sources. The control strategies presented here are Direct Power Control, 2 other DPC methods DPC to reduce CM voltage emissions that are EMC-I-DPC and EMC-II-DPC. Another two strategies are also presented with a concept of virtual flux i.e EMC-I-VF-DPC and EMC-II-VF-DPC. MATLAB/Simulink software is used to implement the so called techniques and the parameters like are injected current into electric grid , %Total harmonic distortion of current injected vs. generated power, %Total harmonic distortion of current injected vs DC link voltage (Vdc) and %Total harmonic distortion of current injected vs CM voltages are shown.
Highlights
In the recent years there is a continuous development of control strategies for grid connected active rectifiers [1]
Figure.7 shows inverter current vs. time waveforms of EMC-II-DPC & EMC-II-VF-DPC and their FFT analysis with same working conditions under steadystate
The injected current %total harmonic distortion (THD) vs. power generated is shown in Figure.9 and Fig. 10 shows EMC-I-DPC & EMC-II-DPC %THD injected current vs Vdc
Summary
In the recent years there is a continuous development of control strategies for grid connected active rectifiers [1]. The famous and usually adopted technique is purely on the idea of controlling the active & reactive powers directly by selecting proper switching state patterns on the basis grid voltage space-vector instantaneous position [3]. This one is called as Direct Power Control technique. Classic DPC in generating mode is done and next to this the new technique referred as EMC-DPC has been derived for 3-phase distributed generation fed by nonconventional energy sources [7] [8] In this new technique the CM voltages produced by VSCs towards grid are reduced. The result analysis compared purely from the point of injected currents into the grid’s harmonic content, current injected Total Harmonic Distortion vs. Power generated and vs. voltage (DC Link) Vdc
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