Abstract
An advanced direct torque control (DTC) technique using Model predictive control (MPC) is proposed for matrix converter (MC)-based permanent-magnet synchronous motor (PMSM) drive system, which reduces the torque ripples, does not need the duty cycle calculation, and ensures the fixed switching frequency. Analytical expressions of change rates of torque and flux of PMSM as a function of MC – dqo components are derived. The predictive model of PMSM and MC is realized by means of State model. Then, the advanced MC-fed DTC algorithm is implemented based on Cost function evaluation. The simulation results exhibit remarkable torque ripple reduction with the help of MPC. As a result, the proposed strategy is proved to be effective in minimizing the torque ripples for MC-based PMSM drives.
Highlights
The Matrix converter is a single-stage power converter, which consists of m x n bidirectional power switches in an array form
Research works on commutation techniques [1], operation stability [2], and control/modulation strategy [4]–[12] of matrix converter (MC) increase the usage of Matrix converter in many fields like elevators, wind power generation, and mechanical manufacture [13]
The Model predictive control strategy is implemented with the MC – direct torque control (DTC) fed permanent-magnet synchronous motor (PMSM) motor to minimize the torque ripples
Summary
The Matrix converter is a single-stage power converter, which consists of m x n bidirectional power switches in an array form. A tremendous research work focusing on control and modulation strategies of MCs can be divided into four types They are scalar techniques, pulse width modulation (PWM), predictive control, and direct torque control (DTC) [3].The Venturini method [4] is the first scalar technique, which obtains the duty ratio of each switch directly by calculating the function of the instantaneous value of the input voltage and the reference value of the output voltage. MC-DTC adopts hysteresis comparators and switching tables which experiences the two major shortcomings: significant torque ripples and variable switching frequency [14] To overcome these drawbacks, [15] is implemented which utilizes the duty cycle calculation. The Model predictive control strategy is implemented with the MC – DTC fed PMSM motor to minimize the torque ripples. The generalized MP-DTC [16] is approached to reduce the switching losses. The Branch and Bound algorithm [17] for PMSM is carried out to reduce the computational time of Cost function
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