基于占空比調(diào)制的新型十八扇區(qū)直接轉(zhuǎn)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(tǒng)永磁同步電機直接轉(zhuǎn)矩控制穩(wěn)態(tài)運行時，存在定子磁鏈幅值和電磁轉(zhuǎn)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(zhuǎn)矩控制效果的不平衡問題，基于扇區(qū)細分的思想，并結(jié)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(qū)直接轉(zhuǎn)矩控制方法，以此來改善電壓矢量的控制效果。針對傳統(tǒng)直接轉(zhuǎn)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(diào)制減小轉(zhuǎn)矩脈動。與傳統(tǒng)直接轉(zhuǎn)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(zhuǎn)矩波動的有效性。
關(guān)鍵詞：永磁同步電機；直接轉(zhuǎn)矩控制；占空比調(diào)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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