The Source Three Phase Voltages Distort when Simulating HVDC

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I am trying to build my own model of HVDC transmission system via Simulink, so I started to build the three phase full wave (Bridge) rectifier. Unless I put the Three Phase Source ideal, R & L = 0, the Vabc come distorted and acting funny (fluctuating) that do not give me the correct wave forms, and the whole system is worthless (Vdc is not correct).

My model simply consists of: 3 Ph Source, Three-Phase V-I Measurement, PLL, Pulse Generator (Thyristor, 6-Pulse), the Bridge Rectifier (the Universal Block or using six Thyristors).

I looked at the already existing models. I copied and put the components that these models have to my model, like the RLC Parallel branch, AC filter and the Transformer (between the source and the Rectifier) , and the other components like the smoothing RL and the Transmission Line, AC system (after the Rectifier). However, nothing worked.

So, I hope that somebody know why is that happening and could help me fix it. Thanks.

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John D'Errico 2018-1-14

Reading your mind is difficult, just as is seeing inside your computer without your help. Nobody can know what you did wrong without you showing what you did. So if you want help, you need to show your code.