NPC三电平逆变器永磁同步电机控制系统的研究与实现

发布时间：2018-06-11 22:16

本文选题：NPC三电平逆变器 + 永磁同步电机　；参考：《东北大学》2014年硕士论文

【摘要】：在我国电能资源消耗不断增加,并且提倡节能减排的今天,变频调速系统已作为节能减排的重要手段之一被广泛应用,由于多电平逆变器对功率开关器件耐压要求低,输出谐波含量较少,电磁干扰小等优点被广泛应用在高压大功率交流变频调速系统中,其中NPC (Neutral Point Clamped)三电平逆变器是应用最为广泛的一种拓扑结构。永磁同步电机(Permanent Magnet Synchronous Motor, PMSM)由于结构简单、效率高、控制性能好等优点已被广泛应用于交流伺服领域和变频调速系统。本文从三电平逆变器和永磁同步电机的结构特点出发,根据两者的数学模型和理论基础,介绍了基于NPC三电平逆变器永磁同步电机的一些基本的控制方法和发展情况。并对三电平逆变器永磁电机直接转矩控制DTC做出分析和对算法的改进,提出了两种方法并进行仿真及相关实验研究,本文主要完成的工作有：基于改进作用矢量型固定合成矢量的直接转矩控制算法研究,鉴于三电平NPC逆变器固有问题：中点电位偏移、输出电压变化率高、开关频率及开关损耗高等提出一种基于中点电位控制的固定合成矢量算法。该算法将不同的空间电压矢量按优先考虑最小中点电压波动的原则进行合成,同样有效克服电压输出变化率高和开关损耗大等问题,并建立基于Matlab/Simulink环境仿真系统模型,证明该方法有效的抑制了中点电位不平衡、输出电压变化率高、开关损耗等问题。基于改进型固定合成矢量的直接转矩算法研究,本文在研究十二矢量固定合成方法的基础上,为了更加精确控制电磁转矩和定子磁链,将固定合成矢量个数增加到24,将整个矢量空间细分到24个空间作用区域,该算法在解决二极管钳位型固有问题的同时,进一步减小输出电压、电流谐波含量,从而减小电机定子磁链与电磁转矩的高频脉动波纹。本文最后完成了NPC三电平逆变器永磁同步电机控制系统的实验,它的硬件系统主要包括控制电路、驱动电路、检测调理电路、保护电路等等；在DSP的集成开发环境CCS3.3完成软件设计。通过实验证明该系统的正确性和可行性。
[Abstract]:With the increasing consumption of power resources in our country and the promotion of energy saving and emission reduction, the frequency conversion speed regulation system has been widely used as one of the important means of energy saving and emission reduction, because of the low voltage requirements of the multilevel inverter to the power switch devices. The advantages of low output harmonics and small electromagnetic interference are widely used in high voltage and high power AC variable frequency speed control systems, among which NPC Neutral Point Clamped-based three-level inverter is the most widely used topology. Permanent Magnet synchronous Motor (PMSM) has been widely used in AC servo field and variable frequency speed control system because of its simple structure, high efficiency and good control performance. Based on the structural characteristics of three-level inverter and permanent magnet synchronous motor, this paper introduces some basic control methods and development of permanent magnet synchronous motor based on NPC three-level inverter according to their mathematical model and theoretical basis. The DTC of permanent magnet motor with three-level inverter is analyzed and the algorithm is improved. Two methods are proposed, and the simulation and experimental research are carried out. The main works of this paper are as follows: the research of direct torque control algorithm based on improved fixed synthesis vector of action vector, in view of the inherent problem of three-level NPC inverter: neutral point potential offset, high output voltage change rate, A fixed synthesis vector algorithm based on midpoint potential control is proposed for switching frequency and switching loss. The algorithm combines different space voltage vectors according to the principle of priority to minimum midpoint voltage fluctuation, which can also overcome the problems of high voltage output change rate and high switching loss, and establish a simulation system model based on Matlab / Simulink environment. It is proved that this method can effectively suppress the imbalance of midpoint potential, high output voltage change rate, switching loss and so on. Based on the improved direct torque algorithm of fixed synthesis vector, in this paper, based on the study of twelve vector fixed synthesis method, in order to control the electromagnetic torque and stator flux more accurately, The number of fixed synthetic vectors is increased to 24, and the whole vector space is subdivided into 24 space action regions. The algorithm solves the inherent problem of diode clamping while further reducing the output voltage and current harmonic content. Thus reducing the high frequency ripple of stator flux and electromagnetic torque. Finally, the experiment of NPC three-level inverter PMSM control system is completed. Its hardware system mainly includes control circuit, drive circuit, detecting conditioning circuit, protection circuit and so on. The software design is completed in the DSP integrated development environment CCS 3.3. The correctness and feasibility of the system are proved by experiments.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM464;TM341

【相似文献】