Control of PMSM Drive Using Lookup Table Based Compensated Duty Ratio Optimized Direct Torque Control (DTC)

Abstract

There are several ways to reduce the ripple magnitude for direct torque-controlled permanent magnet synchronous motor (PMSM) drives. In this work, the compensated duty ratio optimized direct torque control (DDTC-TC) method was proposed to reduce the ripple for three-phase PMSM. The proposed control strategy employs the simplicity of conventional DTC (CDTC) and compensation of the reference torque to enforce the developed torque to oscillate around the required value. A torque error square minimization technique is employed to determine the duty ratio. The magnitude of the developed torque by the PMSM depends on the torque slope during the active and null voltage periods. The slope of the torque during each period is computed online. Based on the online computed slopes, the magnitude of the switching period and compensation torque were calculated. The ripple reduction capability of the proposed control scheme is tested using Matlab Simulink and a hardware in loop system. Results indicate that the control scheme is effective. Specifically, the torque and speed ripples are very small. The torque ripple during speed fluctuation is less for open-end winding PMSM. In addition, the proposed scheme is tested for four-quadrant operation, and the scheme is effective for four quadrant operation. Finally, verification of the effectiveness of the proposed scheme is performed using OPAL-RT-RT (OP4500). Verification indicates that the proposed scheme is effective.

An Open-Circuit Fault Diagnosis System Based on Neural Networks in the Inverter of Three-Phase Permanent Magnet Synchronous Motor (PMSM)

“…The space vector was divided into six sectors, each evenly distributed in 60°, with vectors (V1-V6) representing these sectors [31]. It should be noted that two zero vectors were present in the space vector [20,30,32]. The normal switching sequences of the three-phase inverter are shown in Table 1, where State 0 and 7 corresponded to the zero vectors, while States 1 to 6 represented the normal switching sequences of the three-phase inverter.…”

New Steady State Current Error Limiters for PMSM Drives

“…The major advantage of the DTC-based PMSM drive is the high dynamic torque response. Whereas the structure of DTC results in high torque ripple and current harmonics [8][9][10]. In the FOC-based PMSM drive, stator d-q current components are regulated to achieve decoupled control of torque and rotor flux (as shown in Figure 2) [11,12].…”

Overview of Sliding Mode Control Technology for Permanent Magnet Synchronous Motor System

“…With the development of new energy vehicles, PMSM has gradually become the mainstream motor for automotive drive control due to their advantages such as reliable operation and good speed regulation performance [6][7][8][9][10][11][12]. Due to complex working conditions and requirements, strict requirements are put forward for the control of the motor Commonly used control techniques in PMSM drive systems include vector control [13][14][15][16][17][18] and direct torque control (DTC) [19][20][21][22][23]. Direct torque control is based on switch control, and there is a large torque fluctuation.…”