I managed to simulate it up to a point, where convergence problems appear again. However, I believe that using IGBTs is wrong because the control signals (PWM1+ and PWM1-) turns ON the IGBT which reverse biases the diode VR1, which means the current can not flow through it. Try maybe with only diodes first and IGBTs in the low side only.
Here is the simulation setup that allows you to simulate it somehow..
View attachment 151049
Likewise, the
thetha=6.28 is wrong. You should try to implement it as thetha=6.28*50*TIME in an ABM/1 block (i.e. ABM with 1 input). The input to the ABM block is
epsilon like follows:
ABM/1 block:
(6.28*50*TIME-V(%IN)) where V(%IN)=Epsilon. Then, take the output of this block to the "SINE" input.
Attached are also the pdf schematic files that represent post #21 + #24.