Hi,
I am using a PI controller and the variable phase shift module to do a single phase shift in the DAB and it works very well. I am trying to do a double phase shift between the QP1 and QP2 ( 1st and the 2nd leg of the primary bridge).
Please let me know how to implement this or if there is a different approach other than using the Variable Phase Shift PWM block.
Thanks
@Bryan_Lieblick please let me know if you can help me with this. Thanks you
Here’s a generic Triple Phase Shift (TPS) PWM block I developed previously. Since TPS is the most generic approach, you can assign the primary and secondary duty cycles to achieve single phase shift (SPS), dual phase shift (DPS), and extended phase shift (EPS) as well.
Under the hood it uses the Variable Phase PWM block from the PLECS library.
It’s worth noting that each of these can be defined using slightly different conventions for what phase shift means, so you’ll want to double check the model against your convention.
tps.plecs (33.3 KB)
Awesome, thank you! Is there any tutorial or any online material to read on how to implement this in PLECS in a DAB?
The modulator block should be pretty self explanatory. There is a great review paper with associated PLECS models on various DAB control approaches. The PLECS models and paper are IEEE Dataport, although I’m not sure if any of the approaches utilize DPS specifically.
Hello
Thank you for sharing the TPS pwm block. I have a quick question:
I understand dp and ds are duty ratios for primary and secondary sides, but not clear for me why phi is limited to 0.25. I’m simulating a DAB in TPS, I’m struggling to understand the definition of the parameter to maximum 0.25.
The modulator in the tps.plecs model does not limit phi to 0.25. It can go all the way from +1 to -1. The values entered on the main schematic (where phi is 0.25) are just for example, and you can increase it. Typically the range of phi is restricted such that the slope of the transmitted power as a function o phase shift is positive \frac{dP(\phi)}{d\phi}>0, which for an ideal DAB operating in single-phase shift (SPS) is +/-0.25 (+/-90 degree phase shift).
