Reducing electrical energy consumption of AHU fans through parameter identification of the drive

This paper concerns usage of an on-line parameter identification method for optimization of power consumption of fan drives with induction machines in air handling units (AHU) of heat, ventilation and air conditioning (HVAC) systems of buildings. Variable frequency drives (VFD) are nowadays a key manner for lowering the consumption of HVAC system in off-peak times. However their controllers don't respect the changes of machine parameters during the operation. Proposed method can enhance the control algorithm of VFD with induction machine to optimize its efficiency. Further it can be implemented also on existing installations as it uses only standard components of the drive.