SPWM ac-dc conceptual design

Let's do a conceptual design of a single-phase bidirectional ac-dc converter.

The design criterion for the example converter is-

Vs = 100 V (peak), 60 Hz

Vo = 150 V

Po = 500 W

Unity power factor operation. Power is flowing from AC to DC.

Draw the vector diagram for the given specs- Vs, Is, VAB1

Let's choose modulation index, m = 0.7

VAB1 = mVo = 0.7*150 = 105 V

The voltage vector, Vs, VAB1, and VL form a right-angle triangle, and therefore,

VL ^2 = Vs^2 - VAB1^2; VL = 32.01 V

Since the converter is operating at unity power factor,

P = Vs*Is/2 ( Vs and Is both are peak value)

Is = 10 A

VL = 2*pi*f*L*Is

from here, L = 8.49 mH

That's all. We have conceptually designed all the crucial parameters needed for the converter to meet the specs.

Let's put these values in the simulation and choose switching frequency to be 10 kHz and output capacitor 5 mF. For 500 W output power at 150 VDC, the output resistance should be 45 ohms.

Everything works as intended. We can also see the phase lag between Vs and Vab in the simulation.?

You can download the simulation model from my MATLAB community exchange profile.?