Abstract
In order to reduce the torque ripple of permanent magnet synchronous motors (PMSMs), this paper proposes a dual-vector predictive torque control strategy based on a candidate vector table. The main feature of this strategy is that two vectors are acted in a control period to form a vector combination, and the vector combination can be either an effective-zero combination or an effective-effective combination. In the process of establishing the vector combinations, the switching frequency is also taken into account, therefore avoiding a high switching frequency, while effectively reducing the motor torque ripple. The candidate vector table is constructed offline, and three sets of candidate vectors and their duty cycles can be determined by looking up the table. Then the cost function is used to screen the action vectors from the three sets candidate vectors, so the two vectors acted in one control period and their duty cycles can be obtained simultaneously. Finally, the feasibility and effectiveness of the proposed method are verified on a 5.2 kW two-level inverter-fed PMSM drive system.
Highlights
Permanent magnet synchronous motors (PMSMs) have the advantages of simple structure, reliable operation, high power density, and have been widely used in many industrial fields, such as aerospace, mechanical manufacturing, rail traffic and other industrial fields [1,2,3]
The input terminal of the control system is connected with an uncontrollable rectifier bridge by the grid and the output terminal is connected with the PMSM by an intelligent power module (IPM)
Under working condition 3, compared with the traditional FCS-Predictive torque control (PTC) and Duty-PTC, the torque ripple is reduced by 31.30% and 18.74%, and the flux amplitude ripple is reduced by 41.24% and 17.39% in the proposed control strategy
Summary
Permanent magnet synchronous motors (PMSMs) have the advantages of simple structure, reliable operation, high power density, and have been widely used in many industrial fields, such as aerospace, mechanical manufacturing, rail traffic and other industrial fields [1,2,3]. Duty-PTC, where the acted vectors in one control period can be a combination of an effective vector and a zero vector, and two effective vectors This method reduces torque ripple by optimizing the vector action time, namely, by duty cycle modulation. In order to improve the steady-state control accuracy of PMSM and to reduce torque ripple, a dual-vector predictive torque control strategy based on candidate vector table is proposed in this paper This novel strategy takes the inverter switching frequency into account, combines basic voltage vectors, and determines the synthesized vector set comprising double-vector combinations, so as to reduce torque ripple without causing a higher switching frequency.
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