基于双三电平逆变器的开绕组异步电机矢量控制研究

发布时间：2018-04-26 02:25

本文选题：双三电平逆变器 + 开绕组异步电机　；参考：《中国矿业大学》2014年硕士论文

【摘要】：多电平逆变器广泛应用于大功率交流调速、有源滤波器、船舶推进等中高压大功率应用场合。与传统的两电平逆变器相比，多电平逆变器具有输入输出性能好，谐波含量低，开关损耗低，电磁干扰小等优点。双三电平逆变器双端供电拓扑可以与五电平逆变器具有同等的电压输出能力，输出电压是单个三电平逆变器的两倍，，且等效开关频率加倍，在大功率变频领域具有明显优势。本文针对基于双三电平逆变器的开绕组异步电机矢量控制系统，对其开绕组异步电机数学模型、开绕组异步电机仿真建模、SVPWM控制策略、中点电位控制策略、矢量控制系统几方面进行研究。在分析开绕组异步电机双端供电系统电路模型的基础上，建立了开绕组异步电机的数学模型，基于开绕组异步电机的数学模型，对开绕组异步电机进行仿真建模，在分析三电平逆变器的原理的基础上，分析了双三电平双端供电的原理，研究线电压坐标系SVPWM算法的基本原理，基于此算法实现双三电平逆变器双端供电结构的SVPWM控制；针对中点电位的平衡问题，分析了中点箝位式三电平逆变器中点电位波动的基本原理，推导出引起中点电位波动的中点电流的表达式，根据电荷守恒原理建立寻优函数，选择出最优的开关序列以及复用矢量的作用时间；基于转子磁链定向的基本原理，针对定子电流转矩分量和励磁分量没有完全解耦的特点，设计一种解耦控制器，最后，基于开绕组异步电机模型进行了开绕组异步电机矢量控制系统的仿真研究。在理论分析研究的基础上，重点对双三电平逆变器双端供电结构SVPWM控制、中点电位的控制以及开绕组异步电机矢量控制系统进行了仿真研究，验证了双三电平逆变器双端供电结构的实用性和正确性。
[Abstract]:Multilevel inverter is widely used in high power AC speed regulation, active filter, ship propulsion and other high power applications. Compared with the traditional two-level inverter, the multilevel inverter has the advantages of good input and output performance, low harmonic content, low switching loss and low electromagnetic interference. The dual-three-level inverter has the same output voltage as the five-level inverter, and the output voltage is twice as high as that of a single three-level inverter, and the equivalent switching frequency is doubled. It has obvious advantages in the field of high-power frequency conversion. Aiming at the vector control system of open-winding asynchronous motor based on two-three-level inverter, the mathematical model of open-winding asynchronous motor, the simulation modeling of open-winding asynchronous motor, the SVPWM control strategy and the neutral-point potential control strategy are discussed in this paper. Several aspects of vector control system are studied. On the basis of analyzing the circuit model of open winding asynchronous motor two-terminal power supply system, the mathematical model of open winding asynchronous motor is established. Based on the mathematical model of open winding asynchronous motor, the open winding asynchronous motor is simulated. On the basis of analyzing the principle of three-level inverter, the principle of double-three-level double-terminal power supply is analyzed, and the basic principle of linear voltage coordinate system (SVPWM) algorithm is studied. Based on this algorithm, the double-terminal power supply structure SVPWM control of dual-three-level inverter is realized. Aiming at the balance of neutral point potential, the basic principle of neutral point potential fluctuation of three-level inverter with neutral point clamp is analyzed, the expression of neutral point current causing neutral point potential fluctuation is deduced, and the optimization function is established according to the principle of charge conservation. The optimal switching sequence and the action time of the multiplexing vector are selected. Based on the basic principle of rotor flux orientation, a decoupling controller is designed for the characteristics that the stator current torque component and the excitation component are not completely decoupled. Based on the open winding asynchronous motor model, the vector control system of open winding asynchronous motor is simulated. On the basis of theoretical analysis and research, the SVPWM control, neutral-point potential control and vector control system of open-winding asynchronous motor are simulated. The practicability and correctness of the dual-terminal power supply structure of dual three-level inverter are verified.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM464;TM343

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