I have made a control algorithm which gives me reference direct voltage and reference quadrature voltage for my developed system.I wish to to calculate required value for modulation index "m" to obtain 1 pu generated voltage by the converter.

I did a normal google search and came across the formula

m=Vnom * 2*sqrt(2/3) / Vdc

http://maxwellsci.com/print/rjaset/v6-748-753.pdf    (given in the matlab model of the paper..Pg 4)

From where is this formula obtained and what is the logic behind this ?

In matlab model power_wind_type_4_det.mdl I again came across this conversion.I am attaching a screenshot of same for reference

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