【作者】 蔡焱钢；

【导师】 南余荣；

【作者基本信息】 浙江工业大学 ， 控制理论与控制工程， 2008， 硕士

【摘要】 感应电机的无速度传感器矢量控制是目前电气传动领域研究的热点之一,其主要研究内容为在存在参数变化、扰动及各种不确定性干扰的情况下,如何采用一种快速、有效的方法对转子磁链、转子转速进行较为准确的观测。无速度传感器的矢量控制技术是在带速度传感器的矢量控制基础上发展起来的,因此,本文首先介绍了坐标变换、异步电机的数学模型、磁场定向矢量控制的原理和空间矢量脉宽调制技术(SVPWM)原理。而后介绍基于滑模变结构的异步电机转子磁链和电机转速估算方法。本文研究一种基于磁场定向控制的滑模磁链和速度观测器,分析了该控制方法对参数的敏感性。在该观测器的基础上搭建矢量控制系统,并对该系统进行了仿真研究。在此基础上,设计了一种自适应的滑模观测器,该观测器有两个滑模电流观测器,通过这两个观测器的相互作用,进一步消除对电机参数准确性的依赖,并首次采用Lyapunov理论和Popov超稳定性理论对该观测器的稳定性进行了证明,而后对提出的转子磁链观测器和电机转速观测器作了仿真分析。本系统为全数字化的异步电机矢量控制调速系统,采用TI公司专用于电机控制的TMS320LF2407A型数字信号处理器(DSP)作为控制芯片。本文的第三部分介绍了该控制系统软、硬件设计和主要功能模块的原理及其实现方法。硬件设计主要包括主电路、控制电路和保护电路设计。在硬件的基础上,软件采用C/汇编语言编程,实现了转速和电流双闭环矢量控制。最后,应用自行设计的软、硬件进行实验调试,实验结果进一步验证了系统设计的合理性和可靠性。更多还原

【Abstract】 The speed-sensorless vector control of induction motor is one of the hot topics in electric-drive field, whose main study is to adopt a kind of quick and effective method to accurately observe the rotor flux and rotor speed in the condition that the parameters vary when certain and uncertain disturbance exists.The development of speed-sensorless field-oriented controller method is based on with-speed-sensor field-oriented controller method. So firstly, the dissertation analyzes the mathematics model of induction motor, studies field orientated control (FOC) of induction motor and space vector pulse with modulation (SVPWM).Then, this dissertation presents a solution to the problem of accurate flux, and velocity estimation. In this research, a sliding mode based flux and speed estimation technique for speed sensorless control of field oriented induction machine is first investigated. The parameter sensitivity of the control method is also analyzed. The method is used to construct a simplified system for speed-sensorless vector control of induction motor. The effectiveness of the proposed observers is analyzed by simulation in this control system. Then an adaptive sliding mode observer is proposed and the stability is verified by Lyapunov theory and Popov criterion. Two sliding mode current observers are utilized to compensate the effects of parameter variation on the rotor flux estimation, which make flux estimation more accurate and insensitive to parameter variation. The effectiveness of the proposed observers is analyzed by simulation.The dissertation uses Digital Signal Processor (DSP) TMS320LF2407A special for digital motor control of TI Corporation as the control core, and develops the software and hardware of the full-digital induction motor vector control speed adjustment system. The main structures of the software and hardware parts of the speed adjustment system are introduced in the third part of this dissertation. Principles and realization of the main functional blocks of these two parts are also illuminated in this part. In the hardware system, the main circuit, control circuit and protective circuit are designed in detail in this paper. Based on the hardware circuit, the software is programmed by using assembly language and C language combined.The program is debugged on the designed software and hardware system .The results of experiment further demonstrates the reasonableness and superiority of the proposed design method.更多还原