The Design and Realization of Direct Torque Control System for Asynchronous Motor

直接转矩控制技术(简称DTC)是继矢量控制之后又一高性能的交流变频调速技术。与矢量控制技术相比，它具有转矩响应快、控制结构简单、易于实现全数字化等优点。直接转矩控制摒弃了矢量控制中繁琐的电流解耦的控制思想，去掉了PWM脉宽调制器和电流反馈环节，省掉了复杂的矢量变换与电动机数学模型的简化处理，通过检测母线电压和定子电流，直接计算出电机的磁链和转矩，并利用两个滞环比较器，直接实现对定子磁链和转矩的解耦控制。这使得系统具有了控制结构简单、控制手段直接、信号处理的物理概念明确等优点。然而，直接转矩控制在低速时调速系统存在转矩脉动等一定的缺陷。文中深入的分析了直接转矩控制方法的特点及其存在的问题，通过研...Direct Torque Control(DTC) of asynchronous motors，which has been developed in the recent decades, is a powerful control method for motor drives after vector control. Following the vector control technique，the quick development of DTC makes itself a new high-powered Alternating Current(AC) driving technique paralleling to the vector control. The DTC is good at its robust characteristics, simple re...学位：工学硕士院系专业：计算机与信息工程学院自动化系_控制理论与控制工程学号：20033100

Analysis and optimization of SVPWM strategy for a six-phase inverter

为提高六相电压源逆变器的稳定性,最大限度地降低系统功率损耗,通过分析六相电压源逆变器相邻四矢量控制策略,并结合其本身所具有的开关特性,合理利用不同类型的零电压矢量,并调整其在一个开关周期中的作用时间,以达到改善功率器件开关模式的目的,从而优化了六相电压源逆变器空间矢量脉宽调制(SVPWM)策略.仿真结果表明,传统的电压矢量调制方式相比,该方法在不同调制深度下具有理想的谐波特性,同时可以有效地降低逆变器开关损耗.In order to improve the stability and reduce system power loss of a six-phase voltage source inverter,the adjacent four vectors control strategy was analyzed,as well as its own switching characteristics,so as to use different types of zero-voltage vector rationally and adjust the acting time in one switching cycle.By this means,the switching mode of a power device was improved,thereby optimizing the space vector pulse width modulation(SVPWM) strategy of the six-phase voltage source inverter.The simulation results show that compared with the conventional voltage vector modulation mode,the proposed method has ideal harmonic characteristics under different modulation depths,and at the same time,it can effectively reduce the inverter switching losses.国家985工程建设基金资助项目(0630X13400

SVPWM Control Strategy for Six-Phase Voltage Source Inverter

在对六相电压源逆变器矢量控制的分析基础上,结合六相系统电压矢量开关模式的特点,通过对两个零矢量在开关周期中的合理分配,提出新的适用于六相电压源逆变器空间矢量控制方法。该方法在保证输出性能的前提下可以有效地降低开关损耗。仿真结果验证了该方法的有效性。Based on the vector control analysis of a six-phase voltage source inverter and combined with the characteristics of the six-phase system voltage vector switch mode,a new SVPWM control stratygy was proposed by rationally allocating the two zero vectros in the switching cycles.The method can effectively reduce the switching lossed with the guaranty of the output performance.Simulation results verify the effectiveness of the method

The Interface Techniques of LCD with 87C196MC Micro-Computer

本文介绍了GDM12864E显示模块的性能,单片机87C196MC和显示模块软硬件接口技术,以及在LCD图形显示的方法。This paper introduces the liquid crystal display(LCD) malule GDM12864E.The software and hardware interface techniques,and the graphic display of the LCD controlled by 87C196MC micro-computer are discussed

PWM strategy with virtual switching time for five-phase inverter

针对五相电压源型逆变器的脉冲宽度调制控制技术,提出一种基于虚拟开关时间的电压调制方法。该方法利用虚拟开关时间的概念推导出一个时间自由度与逆变器各相实际开关时间的关系。在一个开关周期内,通过对该自由度及各相开关时间的合理安排,可以有效的提高系统的调制系数。该方法既简单易懂,又容易数字化实现,无需进行扇区和目标矢量位置的判断,避免了计算量大的问题;通过一个额外自由度的运用,可以方便地在各种类型的脉冲宽度调制间实现无缝切换,并且在一定程度上也揭示了载波型脉冲宽度调制和空间矢量脉冲宽度调制的内在联系。仿真结果验证了该方法的有效性。The pulse width modulation(PWM)approach for five-phase voltage source inverter(VSI) is presented in this paper based on the concept of virtual switching time with a detailed explanation.The relationship between time degree of freedom and the actual inverter switching time of each phase is derived by using this concept.Through reasonable arrangement of the degree of freedom and switching time of each phase,the modulation factor in one switching cycle can be improved effectively.Various PWM schemes can be implemented with lower computational burden through this approach,as it's easy to be understood and realized,and furthermore,a seamless change from one modulation scheme to another becomes feasible.And to some extent,the internal relations of carrier-based PWM and space vector pulse width modulation(SVPWM) are also revealed.The proposed modulation strategy is proved to be effective through using numerical simulations.国家985工程建设项目(0630X13400

Research on Multiphase Permanent Magnet Synchronous Motor Drive Control system

多相电机驱动系统在低压大功率、可靠性要求比较高的场合，如舰船推进、电动汽车、轨道交通和航空航天等领域具有突出的优势和广阔的应用前景。但在其控制方面仍然存在大量的问题有待去研究与解决。本文从任意相数的永磁同步电机出发，重点研究了六相永磁同步电机的驱动控制系统，全文主要内容如下: 首先，从对多相电机相数的定义出发，研究了多相电机的定子绕组结构及其空间分布规律。根据绕组函数法，分析了多相电机谐波电流产生的机理和气隙磁动势的特性，并以此为基础对多相电机的电磁转矩性能进行了较为深入的剖析。建立了由逆变器控制的多相永磁同步电动机的数学模型。以合成磁势不变为准则，推导出了多相电机坐标转换模型，实现了多相电...Multi-phase motor drive system has outstanding advantages and potential applications in the low-voltage high-power, high reliability requirements of the occasion, such as ship propulsion, electric vehicles, rail transport and aerospace fields. But there are still a large number of issues to be studied and resolved in their control area. In this paper, firstly, we analyze motors with an arbitrary n...学位：工学博士院系专业：信息科学与技术学院自动化系_控制理论与控制工程学号：2322007015399

IR2233在功率驱动中的应用

IR2233是IR公司生产的一种高压高边功率MOSFET和IGBT驱动器。该器件内部集成了互相独立的三组半桥电路,并具有多种保护电路。文中简要介绍了IR2233的电气性能、工作原理,给出了IR2233的典型应用电路

Optimization Design for Medial Regularly Sampled SPWM Based On 8XC196MC

介绍了平均规则采样SPWM原理及其在Intel8XC196MC为核心的控制系统中的实现。阐述了提升逆变器输出电压,优化电流波形的设计方法。实践证明,该方法性能良好且容易实现,值得推广。The SPWM principle of Medial Regularly Sampling and the implementation of control system with Intel 8XC196MC as the kernel are introduced in this paper. Andthe method of improving the output voltage of inverter and optimizing the wave of current is expatiated. As proved by practice, this method should be generalized as ithas good performance and is easy to be implemented

核-壳结构多酸/磁性铈铁纳米复合氧化物@SiO_2吸附-氧化脱硫性能

水热法合成了铈铁纳米复合氧化物,采用化学沉积法在其表面包裹SiO_2制备核-壳结构磁性材料,以其为载体负载H_2O_2结合Keggin结构磷钼酸(HPMo)制备了HPMo-H_2O_2 /CeFe_xO_y@SiO_2吸附-氧化脱硫催化剂。采用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、傅里叶红外光谱(FT-IR)、X射线粉末衍射(XRD)、氮气吸附脱附(BET)、31P魔角核磁共振(MAS-NMR)和X射线光电子能谱(XPS)等对催化剂的结构进行表征。结果表明,SiO_2将CeFe_xO_y包裹形成核-壳结构纳米复合材料,以其为载体负载HPMo-H_2O_2后Keggin型多酸的骨架结构保持,并产生少量过氧化磷钼酸盐活性物种。不同催化剂对有机硫化物二苯并噻吩(DBT)的吸附脱硫和氧化脱硫性能,均呈现出HPMo-H_2O_2 /CeFe_xO_y@SiO_2 > CeFe_xO_y@SiO_2 > CeFe_xO_y的活性顺序,多酸的引入大大提升了其对大分子有机硫化物的吸附和氧化脱除性能,催化氧化脱硫活性的提高源于多酸分子“假液相”反应过程的结果。在反应温度60 ℃,反应3 h,m(油)∶m(催化剂)= 35∶1,n(O)∶ n(S)= 10∶1的条件下,对DBT氧化脱除率达到99.4%。制备的磁性核-壳结构氧化脱硫剂有理想的氧化脱除DBT的循环使用性能,并且可通过外加磁场进行简单分离,是一类制备方法简单、催化活性高且稳定性好的绿色环保型催化剂

核-壳结构多酸/磁性铈铁纳米复合氧化物@SiO_2吸附-氧化脱硫性能

水热法合成了铈铁纳米复合氧化物,采用化学沉积法在其表面包裹SiO_2制备核-壳结构磁性材料,以其为载体负载H_2O_2结合Keggin结构磷钼酸(HPMo)制备了HPMo-H_2O_2 /CeFe_xO_y@SiO_2吸附-氧化脱硫催化剂。采用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、傅里叶红外光谱(FT-IR)、X射线粉末衍射(XRD)、氮气吸附脱附(BET)、31P魔角核磁共振(MAS-NMR)和X射线光电子能谱(XPS)等对催化剂的结构进行表征。结果表明,SiO_2将CeFe_xO_y包裹形成核-壳结构纳米复合材料,以其为载体负载HPMo-H_2O_2后Keggin型多酸的骨架结构保持,并产生少量过氧化磷钼酸盐活性物种。不同催化剂对有机硫化物二苯并噻吩(DBT)的吸附脱硫和氧化脱硫性能,均呈现出HPMo-H_2O_2 /CeFe_xO_y@SiO_2 > CeFe_xO_y@SiO_2 > CeFe_xO_y的活性顺序,多酸的引入大大提升了其对大分子有机硫化物的吸附和氧化脱除性能,催化氧化脱硫活性的提高源于多酸分子“假液相”反应过程的结果。在反应温度60 ℃,反应3 h,m(油)∶m(催化剂)= 35∶1,n(O)∶ n(S)= 10∶1的条件下,对DBT氧化脱除率达到99.4%。制备的磁性核-壳结构氧化脱硫剂有理想的氧化脱除DBT的循环使用性能,并且可通过外加磁场进行简单分离,是一类制备方法简单、催化活性高且稳定性好的绿色环保型催化剂