摘要
双级矩阵变换器传统直接转矩控制策略中转矩波动大,输入侧电流谐波畸变率较高。针对上述问题,提出了一种基于占空比优化的改进直接转矩控制策略。对系统逆变级电压矢量扇区进行细分,在分析电压矢量与转矩、磁链之间数学关系的基础上,将其对转矩、磁链作用的进行量化;根据参考电压矢量所处扇区及量化表格选择逆变级输出的最优电压矢量,由最优电压矢量对占空比进行优化计算,实现对转矩和磁链的精确控制。仿真结果证明转矩波动减小,输入侧电流谐波畸变率降低,表明改进的直接转矩控制策略在不影响系统动态性能的前提下,改善了系统的稳态性能。
The traditional direct torque control(DTC)strategy of two-stage matrix converter(TSMC)has large torque fluctuation and high harmonic distortion rate of input current.Aiming at the above problems,an improved di-rect torque control strategy is proposed based on duty cycle optimization.The inverter voltage vector sector of the sys-tem was subdivided,abd on the basis of analyzing the mathematical relationship between voltage vector,torque and flux linkage,the effects of voltage vector on torque and flux linkage were quantified.The optimal voltage vector of the inverter stage output was selected according to the sector and the quantization table of the reference voltage vector,and the duty ratio was optimized with the optimal voltage vector to achieve precise control of the torque and the flux linkage.The simulation results show that the torque ripple is reduced and the input current harmonic distortion rate is reduced,which indicates that the improved direct torque control strategy can improve the steady state performance of the system without affecting the dynamic performance of the system.
作者
耿强
吴晗
田宇
安海骄
GENG Qiang;WU Han;TIAN Yu;AN Hai-jiao(School of Electrical Engineering and Automation,Tianjin Polytechnic University,Tianjin 300387,China;Tianjin Institute of Metrological Supervision and Testing,Tianjin 300192,China)
出处
《计算机仿真》
北大核心
2020年第12期326-331,464,共7页
Computer Simulation
基金
国家自然科学基金(51577134)
天津市教委科研计划项目(2018KJ207)。
关键词
永磁同步电机
双级矩阵变换器
最优矢量选择
占空比控制
Permanent magnet synchronous motor
Two-stage matrix converter
Optimal vector selection
Duty cycle control
