基于占空比調制的新型十八扇區直接轉矩研究
吳中豪，周潔敏，李濤，朱紫涵
（南京航空航天大學 民航學院，江蘇 南京 211000）
摘 要：傳統永磁同步電機直接轉矩控制穩態運行時，存在定子磁鏈幅值和電磁轉矩脈動較大的問題。分析了有效電壓矢量對于定子磁鏈和轉矩控制效果的不平衡問題，基于扇區細分的思想，并結合三電平逆變器新增的6個有效電壓矢量，提出了新型十八扇區直接轉矩控制方法，以此來改善電壓矢量的控制效果。針對傳統直接轉矩控制中，由于整個采樣周期施加同一電壓矢量而帶來的過補償問題，采用占空比調制減小轉矩脈動。與傳統直接轉矩控制效果進行仿真對比，驗證了所提新型控制策略減小定子磁鏈和電磁轉矩波動的有效性。
關鍵詞：永磁同步電機；直接轉矩控制；占空比調制
中圖分類號：TM341 文獻標識碼：A 文章編號：1007-3175(2020)07-0013-06
New Eighteen-Sector Direct Torque Control Based on Duty Ratio Modulation
WU Zhong-hao, ZHOU Jie-min, LI Tao, ZHU Zi-han
（College of Civil Aviation, Nanjing University of Aeronautics and Astronautics, Nanjing 211 000, China）
Abstract: In the traditional direct torque control (DTC) of permanent magnet synchronous motor (PMSM) in steady state operation, the ripple of stator flux linkage amplitude and electromagnetic torque is large.In this paper, the unbalance problem of the effect of active voltage vectors on stator flux linkage and torque control is analyzed.Based on the idea of sector subdivision, combined with the six new active voltage vectors added by the three-level inverter, a new eighteen-sector direct torque control method is proposed to improve the control effect of voltage vectors.For the overcompensation problem caused by the voltage vector acting on a whole sampling period in DTC, the duty ratio modulation (DRM) method is used to reduce the torque ripple.Compared with the control effect of traditional direct torque, the effectiveness of the proposed new control strategy to reduce the ripple of stator flux linkage and electromagnetic torque is verified.
Key words: permanent magnet synchronous motor; direct torque control; duty ratio modulation
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