I used PSIM to make a thyristor single-phase rectifier. Why is the sinusoidal voltage simulation incorrect?

乱世煮酒论天下

I used PSIM to make a thyristor single-phase rectifier. Why is the sinusoidal voltage simulation incorrect? [Copy link]

 

Why does the sinusoidal voltage signal at the input end become like this, with no negative half-cycle? I don't understand. Is it a software problem or some other reason?

maychang

[Is there a problem with the software or something else? ]

It's hard to say whether there is a problem with the software, but there is definitely a problem with your simulation.

The oscilloscope uses only two channels, Channel A measures the transformer primary voltage, and Channel B measures the transformer secondary voltage. What capacity and winding voltage rating of the transformer did you use?

Thyristor signal source G1, is that grounded? Your thyristor cathode is not grounded.

乱世煮酒论天下

maychang posted on 2024-5-19 19:08 [Is it a problem with the software or something else? ] It's hard to say whether there is a problem with the software, but there must be a problem with your simulation. The oscilloscope only uses two...

Ideal transformer, this example is exactly copied from the book, but it doesn't work for me

maychang

Luan Shi Zhu Jiu Lun Tian Xia published on 2024-5-19 19:19 Ideal transformer, this example is completely copied from the book, but it doesn't work for me

[This example is exactly copied from the book, but it doesn’t work for me]

It can be seen that it is not feasible to copy it completely.

木犯001号

The examples in the book are not necessarily complete!!! I have encountered this before. When I was studying before, I encountered the code explanation in the book and then copied it completely and found that it was not usable at all. I checked it several times and found nothing wrong. Later, after guidance, I realized that the code in the book was only used to explain the purpose and was not complete. It only intercepted a small part of it and needed to be completed by myself.

I also encountered a similar situation when designing a circuit diagram. When explaining in the book, only the key parts were shown, but some auxiliary but necessary circuit positions were not shown. I also calculated according to what I had learned and designed it once before confirming that it was complete.

木犯001号

This is especially true for simulations! A slight deviation in your simulation model can lead to a huge error. Even if they are exactly the same, the results may be different due to the difference in simulation.