This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

VFD (also called VVVF) cloosing loop with FOC?

I have a project of implement a control loop for an VFD that is already working with Delfino. For now It is working well but in open loop, I mean the modulation is Fixed and doesn't matter if the charge is suffering changes. We have implemented this power converter for supply a system of refrigeration that involves a three phase motor for compressing but also monophasic motors for ventilation. When the three phase motor becomes active there is a voltage droop because we haven't implemented the controled modulation. My question is....

How Could I avoid that? Should I implement sensorless FOC like if the system was only the trhee phase motor? Or could I implement a easiest solution because my equipment was designeed not for control speed or torque, it was created just for realize a convertion in the frecuency and voltage that received the regirathor system.