摘要
在矩阵变换器虚拟直流环节的思想上,给出了双级矩阵变换器的电路拓扑,仿真研究了双级矩阵变换器的双空间矢量调制策略。根据双空间矢量调制的缺点,提出了逆变环节采用直接转矩控制,整流环节控制输入电流矢量或直流母线电压来实现输入功率因数校正或提高电机系统性能的双级矩阵变换器供电的直接转矩控制系统。对整流环节采用空间矢量调制时的直接转矩控制系统进行了仿真研究,在分析转矩脉动的基础上给出了一种输入功率因数滞环比较的闭环控制方法。对直流母线在高、中、低范围内的直接转矩控制系统进行了仿真研究,分析了直流母线电压在不同范围内的系统性能,并由此给出一种通过控制直流母线电压范围来提高系统性能的控制方法。仿真结果表明这种方法兼顾了直流母线在高电压范围内动态性能好和在低电压范围内因离散化引起的转矩脉动较小的优点,并使用中电压范围减小了因直接转矩控制失效引起的不合理转矩脉动,从而提高了系统的动、静态性能。
The topology of two-stage matrix converter （TSMC） given based on the concept of fictitious DC link of matrix converter and dual space vector modulation strategy of TSMC was studied. The direct torque control （DTC） system fed by TSMC was proposed that to control the inverter to implement DTC, and to control the rectifier to correct input power factor, or improve the performance of the DTC system by controlling input current space vector or the scope of DC bus voltage. The DTC System with the rectifier using space vector modulation was studied. A novel input power factor closed-loop control method using hysterias controller was proposed in order to reduce torque tipple based on the analysis of torque tipple, The DTC system with DC bus voltage within high, middle, low scope was studied and the performance of the system was analyzed. A novel control method was proposed by controlling the scope of DC bus voltage to improve the performance of the system. Simulation results showed that this method combines the advantages with high-scope DC bus voltage： good dynamic performance and the advantages with low-scope DC bus voltage, low torque tipple and lowers the unreasonable torque ripple using middle-scope DC bus voltage when DTC was disabled.
出处
《微电机》
北大核心
2008年第8期76-79,92,共5页
Micromotors
基金
陕西科技大学校级自然科学基金项目(ZX07-25)
西北工业大学研究生创新实验中心项目(06045)
