how to trigger thyristors in a three phase converter??

i have tried to simulate a three phase converter but its showed me some absurd results..can somebody help me out in finding error in this model http://imageshack.us/photo/my-images/692/fullwaveconverter.png/ and this was the result i got after simulating http://imageshack.us/photo/my-images/696/fwconverterscope.png/ i am not sure about my triggering for this i have taken 0 degrees as triggering http://imageshack.us/photo/my-images/51/pulsegenerator.png/ please help me out where i have gone wrong..