Im writing code for SP-PWM for a 3 phase voltage source inverter but since im a bit naive to the topic I need some clarifications regarding some questions I have. Lets cut to the point. For 3-phase system, we can transform the 3 phase quantities it to a d-q frame via following transformation matrix.
Where Van,Vbn,Vcn are phase voltages for WYE connected load at Va-Vb-Vb lines of inverter legs as shown below.
Now, we need to rotate the voltage vector Vref in d-q frame.
I can compute the magnitude of Vref and time required by each mosfet to change its state. But there is some nomenclature im not familiar with, such as switching freqency term, given by Tz = 1/fz. We need switching freqency, lets say 900HZ, which will give us 1.11ms Tz, using this assumption we can compute T1,T2 and To.
Q) How does varying angle of Vref in d-p frame(lets say we increment angle by 10 degree in each sector) will affect my output voltage frequency ?
Q) How does varying switching freqency(please also define switching freqency in terms of this SVPWM) affects the voltage output freqency of the inverter ? Is there any relation b/w them ?
Q) What can I do produce a variable output voltage freqency ? (i.e how parameters will be varying in such case ? )