I want to design the filter for DC-AC converter topology which is half bridge. I'm using SiC MOSFET for that. Input voltage = 560V, Output voltage = 500V. I'm using Plecs + MATLAB for designing the Circuit. I want to reduce the losses so that it will be less that 200W overall.
#powerelectronics #electrical #semiconductor #powerengineering #Convertertopology
I would presume you have a basic 3-phase VSI inverter, grid-tied by an L-C filter, to answer this question. In this case, choosing the inductive reaction at the grid frequency is a popular practice to be 5-10% of your base impedance rating (= Vgrid / Igrid). For example, if your grid voltage is 230 V(ph) and the rated AC inverter current is 23 A per phase, then 10 Ohm (= 230/23) is your base impedance. Now you can calculate the inductance you need. Once you have the inductance value, the capacitance value can be calculated on the grid side (usually less than 5 percent) depending on the THD requirement.
If you don't have L-C and you only have ' L, ' then the value depends entirely on the current grid THD-higher the inductance value, lower the THD value. And the inductance is going to be much bigger in this situation.
Thank you for the hint. It is a single-phase topology. Also, as we have very low switching frequency, so inductor value should be low.
There are various approaches, including mathematical calculation, simulation and trial and error.
The easiest strategy is using trial and error, but if you need a more accurate answer, you can write the equations (usually writing equations using Laplace can make things easier) and then find the answer. Please note that you may need to make some assumptions to obtain the final answer.
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