基于单DSP的双PWM变频调速系统的研究

发布时间：2018-05-14 19:29

本文选题：双PWM + 直接功率控制　；参考：《东北大学》2014年硕士论文

【摘要】：交流电机变频调速已经在工业控制领域得到了广泛的应用,传统的变频器采用不可控的二极管整流,这样导致网侧电流有谐波污染,功率因数低,无法回馈能量。双PWM变频调速系统以可控整流代替不可控整流,以其能够实现输入功率因数可控、直流母线电压可调和能量双向流动等优势,成为学术界的研究的热点。三相PWM整流器是双PWM变频器的核心部分之一,本文首先推导了整流器的功率数学模型,在此基础上分析和设计了基于空间矢量调制的三相整流器直接功率控制系统,并对三相整流器控制系统按照工程最佳典型系统进行了调节器参数的整定,然后对所设计的控制系统及整定的参数进行了仿真分析和验证。高性能的电机调速是双PWM变频调速系统的重要目的,本文采用具有优良动静态性能的转子磁场定向量控制策略。对于调速性能受转子时间常数影响大的问题,提出了基于无功功率模型的转子时间常数在线辨识方法,并对其数字控制实现的离散化误差问题进行了分析和仿真实验。为了扩大电机的调速范围,提出了一种最大化转矩的弱磁方法,通过与传统的弱磁控制方法仿真分析比较,验证了所提出的弱磁控制方法的优越性。母线电压是否稳定对系统性能有重要影响,为了稳定母线电压,本文采用有功功率前馈控制策略,对采用不同的前馈控制策略时系统的抗干扰能力进行了理论分析和仿真验证。最后,对三相双PWM变频调速系统中的网侧电感和直流侧电容参数进行了设计,并以TMS320F28335 DSP控制器为核心进行了硬件和软件设计,搭建了双PWM控制系统实验平台,并做了相关实验。
[Abstract]:The frequency conversion of AC motor has been widely used in the industrial control field. The traditional frequency converter uses uncontrollable diode rectifier, which leads to harmonic pollution of the grid side current, low power factor, unable to feedback energy. The double PWM frequency conversion speed control system uses controllable rectifier instead of uncontrollable rectifier, which can realize the controllable input power factor, and the DC bus voltage can reconcile the two-way flow of energy, so it has become a hot research topic in academic circles. The three-phase PWM rectifier is one of the core parts of the double PWM converter. Firstly, the power mathematical model of the rectifier is derived, and the direct power control system of the three-phase rectifier based on space vector modulation is analyzed and designed. The adjuster parameters of the three-phase rectifier control system are adjusted according to the best typical engineering system, and the simulation analysis and verification of the designed control system and the tuning parameters are carried out. High performance motor speed regulation is an important purpose of dual PWM variable frequency speed control system. In this paper, the rotor flux oriented control strategy with excellent dynamic and static performance is adopted. For the problem that the speed regulation performance is greatly affected by the rotor time constant, a rotor time constant on-line identification method based on reactive power model is proposed, and the discretization error problem of its digital control is analyzed and simulated. In order to enlarge the speed range of the motor, a method of maximum torque weakening is proposed. The superiority of the proposed method is verified by comparing with the traditional weak magnetic field control method. Whether the bus voltage is stable or not has an important effect on the system performance. In order to stabilize the bus voltage, the active power feedforward control strategy is adopted in this paper. The anti-interference ability of the system with different feedforward control strategies is theoretically analyzed and simulated. Finally, the parameters of inductance and DC side capacitance in three-phase dual-PWM variable frequency speed regulating system are designed, and the hardware and software are designed with TMS320F28335 DSP controller as the core. The experimental platform of double PWM control system is built, and the related experiments are done.
【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】：TM921.51;TM461

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