矩阵变换器—永磁同步电机系统直接转矩控制

发布时间：2018-03-31 23:15

本文选题：矩阵变换器　切入点：永磁同步电机　出处：《天津大学》2014年博士论文

【摘要】：矩阵变换器-永磁同步电机系统以其在功率密度、运行效率、响应速度等方面的优势，在推动高端装备制造的国产化、自主化过程中具有重要地位。本文针对矩阵变换器-永磁同步电机系统传统直接转矩控制策略输入电流质量偏低、转矩磁链波动过大及开关频率不固定问题，开展一系列研究，建立并提出了矩阵变换器-永磁同步电机系统评价体系，并基于评价体系提出了三种新型直接转矩控制策略。提出矩阵变换器-永磁同步电机系统评价体系。在评价体系的建立过程中，，将矩阵变换器和永磁同步电机统一建模，综合运用离散平均、统计分析等方法，逐步形成评价函数、影响因子等表现形式。评价体系揭示了变换器全部开关状态到电机侧转矩、磁链及电网侧无功电荷量的本质非线性映射规律，为新型矩阵变换器-永磁同步电机系统直接转矩控制策略的提出奠定了理论基础。提出矩阵变换器-永磁同步电机系统主从矢量直接转矩控制策略。基于评价函数分析了变换器有效矢量对电机转矩、磁链的控制规律，建立矩阵变换器开关表，提出主、从矢量选择机制及相应的占空比计算方法。主从矢量策略可合理调配多个开关状态，使电机系统实现快速的动态响应和精细、平滑的稳态性能。提出矩阵变换器-永磁同步电机系统占空比优化直接转矩控制策略。基于影响因子对主从矢量策略的占空比计算过程进行优化，进而提出一种简易的占空比控制策略，探讨了主从矢量策略与占空比优化策略的控制特点。占空比优化策略是一种理想的折中控制方案，具有计算简单、鲁棒性高、转矩控制效果好等特点。提出矩阵变换器-永磁同步电机系统最优矢量直接转矩控制策略。基于影响因子开关表揭示了变换器全部开关状态对电机侧转矩、磁链及电网侧无功电荷量的控制规律，结合优化控制理论建立目标函数，实现变换器开关状态的择优选取。最优矢量策略不仅结构简单、控制灵活，而且可合理利用变换器旋转矢量，改善电机系统输入、输出波形质量。构建一套高可靠性的矩阵变换器-永磁同步电机系统样机，对传统策略和三种新型控制策略进行实验研究，结果表明，三种新型控制策略均可有效解决传统策略存在的问题，且保持传统策略无需转子位置、转矩响应迅速等特点，证明了本文理论分析的正确性和控制策略的有效性。
[Abstract]:Matrix converter permanent magnet synchronous motor system with the power density, efficiency, response speed and other advantages, to promote domestic production of high-end equipment, plays an important role in the process of self. In this paper the matrix converter permanent low input current quality strategy of traditional direct torque control system of magnetic synchronous motor torque. The flux fluctuation is too large and the switch frequency is not fixed, to carry out a series of research, and put forward the establishment of matrix converter permanent magnet synchronous motor system evaluation system, and evaluation system based on the proposed three new direct torque control strategy.
The matrix converter permanent magnet synchronous motor servo system evaluation system. In the process of establishing evaluation system, unified modeling of matrix converter and permanent magnet synchronous motor, using discrete mean, statistical analysis and other methods, gradually formed the evaluation function, influence factor and other forms. The evaluation system reveals all converter switch state to the motor the lateral torque, essentially nonlinear mapping rules in flux and reactive charge, is a new type of matrix converter permanent lay a theoretical foundation for proposing strategies of direct torque control system of PMSM.
The matrix converter permanent magnet synchronous motor direct torque vector control strategy. The evaluation function of converter vector on torque based control law of flux, establish the matrix converter switching table, put forward the main selection mechanism, and the corresponding duty ratio calculation method. The vector vector can be a reasonable allocation of master-slave strategy a plurality of switch state, the motor system to achieve fast dynamic response and steady state performance fine, smooth.
The matrix converter permanent magnet synchronous motor system of the duty ratio optimization of direct torque control strategy. The impact factor of master-slave vector strategy the duty ratio calculation process based on optimization, and then propose a simple duty ratio control strategy of master-slave vector strategy and duty ratio control strategy optimization characteristics of duty. Ratio optimization strategy is an ideal compromise control scheme is simple in calculation, high robustness, torque control effect is good.
The matrix converter permanent magnet synchronous motor torque vector control strategy. The impact factor switching table reveals the converter switching state of all motor side torque control law based on flux and reactive charge, combined with the optimal control theory to establish the objective function, realize the selection of switch converter. The optimal condition vector strategy not only has the advantages of simple structure, flexible control, and rational use of converter motor rotation vector, improve the system input, the output waveform quality.
To build a high reliability of matrix converter permanent magnet synchronous motor prototype system, experimental research, the traditional strategy and three kinds of new control strategies. The results showed that three kinds of new control strategy can effectively solve the problems of traditional strategies, and maintain the traditional strategy without rotor position, fast torque response characteristics is proved validity of the control strategy and theoretical analysis in this paper.

【学位授予单位】：天津大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TM341

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