Three-phase PFC, current loop does not converge using VIENNA topology

tianya3089

Three-phase PFC, current loop does not converge using VIENNA topology [Copy link]

The three-phase PFC adopts the VIENNA topology and samples the DQ rotating vector. However, the process is complicated and the simulation and debugging have been done for a long time. The current loop has no effect and the current cannot be sinusoidal.

I don't understand the meaning of the two PI modules, ID and IQ, in the current inner loop, and how these two modules can achieve the purpose of controlling ID and IQ. The IQ PI loop seen in the closed-loop simulation is always in a divergent and non-convergent state, and the ID PI loop is also in a state of frequent oscillation. However, modifying the parameters of one PI loop alone will affect the waveform of the other PI loop at the same time.

Can anyone who has done this program tell me what causes this phenomenon?

tianya3089

Figure 1 below shows the PI loop waveform of ID, and Figure 2 below shows the PI loop waveform of IQ

tianya3089

Three-level space vector pulse width control method. The current waveforms obtained by current simulation are all messy. For the two current PI loops, it seems that the ID loop cannot control the ID current and the IQ loop cannot control the IQ current. How to adjust the PI parameters of these two loops?

szc5b

"Modifying the parameters of one PI loop alone will affect the waveform of another PI loop at the same time."

"Is it not possible to make the ID loop control the ID current and the IQ loop control the IQ current?"

No decoupling?

tianya3089

szc5b posted on 2019-11-20 09:52 "Modifying the parameters of one PI ring alone will affect the waveform of another PI ring at the same time." "It is impossible to control the ID ring with the ID ring ...

It has been decoupled, so the formula should be correct. I don't know if there is a problem with the formula for VIENNA to calculate the vector to output PWM waveform or where the problem is.

tianya3089

tianya3089 posted on 2019-11-25 20:16 After decoupling, the formula should be correct. I don't know if there is a problem with the formula from VIENNA calculating the vector to outputting the PWM waveform or where the problem lies

No one has responded to this question. Is it because the number of people working on this area is relatively small? I have just started researching this area. Please guide me.