Complex Vector Current Regulation Strategy for a High-Speed Doubly Salient Machine with Stator PMs

Abstract

A complex vector current (CVC) regulation strategy for a high-power density doubly-salient special machine with 12 modular concentrated coils and 12 PMs in the stator and 10 pole protrusions in the rotor is presented in this digest. The special machine has been designed to operate at a rated torque of 41Nm at a base speed of 5000RPM. A plant model of the special machine has been developed using FEA software. The phase flux linkage and inductance have substantial variations with the rotor position and therefore variations and possible errors are expected for the estimation of d-q inductances. Classical current regulation strategy in synchronous reference frame with or without decoupling is not capable of stable operation if uncertainty in the estimation of d-q inductances has been considered to determine proportional and integral constants of the controller. Thus, considering a wide range of uncertainty in the estimation of d-q inductances, the CVC regulation strategy has been employed for this special machine. A comparative analysis of classical and CVC regulation strategies has been presented in this digest for both maximum torque per ampere and field weakening control regimes to regulate the torque or speed over a wide range for electric vehicle traction applications. A detailed stability analysis reveals that the CVC regulation strategy is more robust compared to the classical proportional integral current regulation strategy in synchronous reference frame with decoupling. The performance of these two current regulation strategies has been validated by simulations in continuous domain and verified by employing controller hardware in the loop (CHIL).