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.