Mitigation of high-resistance connection in surface-mounted PMSM drive system based on model predictive current control

Abstract

High-resistance connection fault can result in the increasing of power loss and the rise of heat, so the electric machine drive system possibly can be damaged. Therefore, to reduce the copper loss caused by high-resistance connection in surface mounted permanent magnet synchronous machine drive system, a method to minimize the copper loss based on the model predictive current control is shown in this paper. First, the permanent magnet synchronous machine model is deduced under high-resistance connection fault condition. Then, the direct axis current is deduced to minimize the copper loss. Next, the predictive model of permanent magnet synchronous machine is deduced under fault condition, and the cost function is defined to select the optimal voltage vector. Finally, the proposed model predictive current control strategy is realized to minimize the copper loss. And the effectiveness of this method is verified through the simulation and experiment. According to the results of the simulation and experiment, the proposed model predictive current control method has the same performance as the traditional model predictive current control method, as well as can reduce the copper loss effectively.