LC resonant circuit. At the point when the load resistance is
0.7 Ω, there is a mode change from continuous to discontinuous
rectifier current.
In order to account for the nonidealities of the control loop
and the practical implementation of the current source, we
simulated a switching model of the current source. The results
are shown in Fig. 12. The VA rating remains low, particularly at
optimized point. The system can be optimized at different load
conditions depending on application requirements. Note that,
in all cases, the THD is below 5%. It is also worth noting here
that the rectifier current becomes discontinuous at 0.56 (p.u.),
yet the filter is still able to control the harmonics all the way
down to 0.2 (p.u.). This is one of the benefits of the proposed
approach compared to other approaches that shape the 12-pulse
rectifier output current. Additionally, the LC filter VA rating is
kept quite low.
LC resonant circuit. At the point when the load resistance is
0.7 Ω, there is a mode change from continuous to discontinuous
rectifier current.
In order to account for the nonidealities of the control loop
and the practical implementation of the current source, we
simulated a switching model of the current source. The results
are shown in Fig. 12. The VA rating remains low, particularly at
optimized point. The system can be optimized at different load
conditions depending on application requirements. Note that,
in all cases, the THD is below 5%. It is also worth noting here
that the rectifier current becomes discontinuous at 0.56 (p.u.),
yet the filter is still able to control the harmonics all the way
down to 0.2 (p.u.). This is one of the benefits of the proposed
approach compared to other approaches that shape the 12-pulse
rectifier output current. Additionally, the LC filter VA rating is
kept quite low.
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