Online Adaptive Gain for Passivity-Based Control for Sensorless BLDC Motor Coupled With DC Motor for EV Application

Passivity-based control (PBC) is an energy-based control inwhich total energy is an algebraic sum of stored and dissipated energy. The energy equations are analyzed using Hamiltonian operator. Exact Tracking Error Dynamics Passive Output Feedback (ETEDPOF) method is used to drive a BLDC motor coupled with dc motor. The controller is a linear controller which adapts precise variation by means of sensing output current as well as position of motor for varying speed reference. The system is made sensorless by eliminating both position and speed sensors to reduce cost of implementation using back EMF method. The back EMF of each winding is sensed and using zero crossing detectors, the initial position is found for starting the motor. The speed is observed from back EMF and also, the gate signals are sent to inverter. The inverter is powered from single phase ac supply through dc filter and boost converter. In order to verify features of proposed control scheme, PBC is compared with widely used PI controller and sliding mode control for boost converter and inverter, simulated in
Matlab
and results are observed with constant load torque and speed conditions.