To improve the performance of a current loop, this paper presents a novel current control scheme for an interior permanent magnet synchronous motor (IPMSM) based on the model predictive control (MPC) algorithm in a synchronous rotating frame (dq-frame). The recently developed explicit MPC (EMPC) is introduced to ensure the feasibility of real-time implementation in the control hardware. To achieve feasible reformulation of the current control problem using EMPC, a coupled nonlinear IPMSM mathematical model is linearized using an augmented model with disturbance. Furthermore, to approximate the related quadratic stator current and voltage constraints in the dq-frame, they are also transformed into a series of linear inequalities. We propose an improved disturbance observer based on the augmented model, in conjunction with the concept of offset-free MPC, to estimate both the disturbance terms and the state variables from the predicted and measured outputs. All the influences of plant/model mismatches and un-modeled nonlinear terms are removed by the estimated total disturbance within the closed-loop framework of EMPC. The proposed EMPC scheme not only improves both the dynamic performance and the steady-state precision of the current loop, but it also exhibits robustness against parameter uncertainties. The proposed method has been proven and verified successfully in both simulation and experiment. INDEX TERMS Interior permanent magnet synchronous motor (IPMSM), current control, model predictive control (MPC), explicit solution, disturbance observer.

Based on current research into the mathematical model of the permanent magnet synchronous motor (PMSM) and the feedback linearization theory, a control strategy established upon feedback linearization is proposed. The Lie differential operation is performed on the output variable to obtain the state feedback of the nonlinear system, and the dynamic characteristics of the original system are transformed into linear dynamic characteristics. A current controller based on the input–output feedback linearization algorithm is designed to realize the input–output linearization control of the PMSM. The current controller decouples the d–q axis current from the flux linkage information of the motor and outputs a control voltage. When the motor speed reaches above the base speed, the field-forward and straight-axis current components are newly distributed to achieve field weakening control, which can realize the smooth transition between the constant torque region and weak magnetic region. Simulation and experimental results show the feasibility and viability of the strategy.

Based on current research into the vector control principles of the permanent magnet synchronous motor (PMSM), a control strategy founded upon an Active Disturbances Rejection Controller (ADRC) is proposed. This control strategy consists of an ADRC speed loop and current controller. By studying the factors affecting the running state of a PMSM, a mathematical model is established, and the design principle of the active disturbances rejection controller is analyzed in order to design the ADRC speed loop. The speed loop considers errors caused by uncertain factors, such as external disturbances, to be the disturbance amount, which is observed and then compensated for by the ADRC, thereby improving the dynamic and static performance as well as the anti-disturbance capability of the system. In order to achieve the strong coupling of the PMSM, the current controller was also designed to decouple the d–q axis current. Our simulation and experimental results demonstrate the feasibility and practicability of this control strategy.

With the rapid development of the electric vehicle (EV) industry, charging facilities for electric vehicles are gradually improving, thus meeting the demand for fast and safe charging. This paper comprehensively describes the current development status and future development trend of EVs and their charging infrastructure and analyzes in detail the EV fast-charging system architecture according to the AC/DC coupling configuration. The topologies and control techniques of the front AC/DC converter and rear DC/DC converter for the charging system are discussed, providing a reference for the future design of hundred-kilowatt level and above fast-charging systems for EVs. In addition, this paper summarizes the EV charging interface and the charging specifications applicable to the hundred-kilowatt power fast-charging system, as well as the impact of fast charging on power batteries, and emphasizes that high-power fast-charging technology is an inevitable trend for the future development of electric vehicles.

Anti-lock Braking System (ABS) has widespread used depending on its mature technology and superior performance. We design a test rig which can simulate the running condition of wheels for ABS to detect the braking performance. The kinetic energy of vehicle is replaced by the kinetic energy of rotating flywheel, and the tire-road friction coefficient is replaced by magnetic powder clutch. The amplitude of exciting current to the clutch has linear relationship with the friction coefficient, so as to provide a datum for detecting the working status of ABS under various road conditions. The system can realize simulating test of single road surface, bisectional road surface and joint road surface. The validity of the road simulation method can be verified by the real-time data from the user interface.