1. Introduction In the two-stage single-phase inverter, the second harmonic current with twice output voltage frequency exists in the former DC converter because the instantaneous output power of the latter inverter contains the pulsating power of twice the output voltage frequency.
When the DC link voltage of the inverter is u dc, the modulation waves u s1 and u s2 can be taken as (1), (2) (1) u s 1 = 1 2 U dc M cos (ω t) (2) u s 2 = 1 2 U dc M cos (ω t π) where M is the modulation index (0 < M < 1); ω is the angular frequency of AC side output voltage. u dc is the DC link voltage. Fig. 1.
The output voltage of the single-phase inverter is (8) u ab = u dc M cos (ω t) = U dc + u pp sin (2 ω t) M cos (ω t) = U dc M cos (ω t) + 1 2 u pp M sin (ω t) + sin (3 ω t) Expression (8) shows that the second ripple voltage of DC link will make the AC output voltage contain abundant third harmonic voltage. 3.
In addition to the standard two-level inverter, a bi-directional switch connects the switching nodes to a third voltage level. T-type inverters typically keep this midpoint voltage to half of the dc-link. With the proposed power buffering method, the midpoint voltage is allowed to fluctuate, utilizing the capacitor as energy storage.
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