INTELLIGENT CONTROL SYSTEM OF PULSED MAG WELDING INVERTER BASED ON DIGITAL SIGNAL PROCESSOR

A fuzzy logic intelligent control system of pulsed MAG welding inverter based on digital signal processor （DSP） is proposed to obtain the consistency of arc length in pulsed MAG welding. The proposed control system combines the merits of intelligent control with DSP digital control. The fuzzy logic intelligent control system designed is a typical two-input-single-output structure, and regards the error and the change in error of peak arc voltage as two inputs and the background time as single output. The fuzzy logic intelligent control system is realized in a look-up table （LUT） method by using MATLAB based fuzzy logic toolbox, and the implement of LUT method based on DSP is also discussed. The pulsed MAG welding experimental results demonstrate that the developed fuzzy logic intelligent control system based on DSP has strong arc length controlling ability to accomplish the stable pulsed MAG welding process and controls pulsed MAG welding inverter digitally and intelligently.

Controller Design for Induction and Brushless Motors Using Matlab with Digital Signal Processor (DSP)

The automation process is a very important pillar for Industry 4.0.One of the first steps is the control of motors to improve production efficiency and generate energy savings.In mass production industries,techniques such as digital signal processing(DSP)systems are implemented to control motors.These systems are efficient but very expensive for certain applications.From this arises the need for a controller capable of handling AC and DC motors that improves efficiency and maintains low energy consumption.This project presents the design of an adaptive control system for brushless AC induction and DC motors,which is functional to any type of plant in the industry.The design was possible by implementing Matlab software and tools such as digital signal processor(DSP)and Simulink.Through an extensive investigation of the state of the art,three models needed to represent the control system have been specified.The first model for the AC motor,the second for the DC motor and the third for the DSP control;this is done in this way so that the probability of failure is lower.Subsequently,these models have been programmed in Simulink,integrating the three main models into one.In this way,the design of a controller for use in AC induction motors,specifically squirrel cage and brushless DC motors,has been achieved.The final model represents a response time of 0.25 seconds,which is optimal for this type of application,where response times of 2e-3 to 3 seconds are expected.

Digital control of pulsed gas metal arc welding inverter using TMS320LF2407A

A digital control of pulsed gas metal arc welding inverter was proposed. A control system consisting of analogue parts was replaced with a new digital control implemented in a TMS320LF2407A DSP chip. The design and constructional features of the whole digital control were presented. The resources of the DSP chip were efficiently utilized and the circuits are very concise, which can enhance the stability and reliability of welding inverter. Experimental results demonstrate that the developed digital control has the ability to accomplish the excellent pulsed gas metal arc welding process and the merits of the developed digital control are stable welding process, little spatter and perfect weld appearance.

REALIZATION OF FUZZY-FILTER CONTROL ON A BRUSHLESS AC GENERATOR

The transistor voltage regulators have been widely adopted in the brushless AC generators in aircraft. This paper researches the digital voltage regulator. The paper presents the hardware platform of the digital voltage regulator, which is based on a DSP chip — TMS320C32. A novel fuzzy filter control structure is developed from normal fuzzy control strategy. And the fuzzy filter control algorithm is adopted in the hardware platform successfully. The computer simulation has been conducted. Some control parameters have been obtained through the simulation. The same parameters have been applied in the digital regulation experiments on a brushless AC generator. In the experiment, the digital voltage regulator results in good responses. From the experiment results, it can be seen that the new control algorithm is efficient for the digital voltage regulator.

Position Sensorless Control for Permanent Magnet Synchronous Motor Using Sliding Mode Observer

An approach of position sensorless control for permanent magnet synchronous motor （ PMSM ） is put forward based on a sliding mode observer. The mathematical model of PMSM in a stationary αβ reference frame is adopted, and the system is controlled by the digital signal processor （ DSP; TMS320LF2407 according to the control achieve closed loop operation of the motor, the stator theory of sliding mode observer. In order to magnetic field should be vertical with the rotor magnetic field and be synchronous with rotor rotating, so the position and speed of PMSM is estimated in real time and the estimated position is modified continuously. The simulation results indicate that the proposed observer has high precision is more robust to the parametric variation and load in estimation of PMSM position and speed, and torque disturbance.

Development of a Reconfigurable Platform for Manufacturing Equipment Control

In modern manufacturing equipment control area,controller is required to deliver higher computing capability for adopting advanced algorithms to meet speed and accuracy requirements,and reconfigurabilities for changing or(and)adding features or functions.This paper presents a methodology in design and implementation of a high performance and reconfigurable platform for manufacturing equipment control.This methodology is in virtue of system on a programmable chip(SoPC)technolo- gy but replacing the on-chip processor by an external high performance,floating-point digital signal processor(DSP).The appli- cation of the DSP is designed as a multi-threaded framework,which has more flexibilities than a traditional single-loop one.Fur- thermore,the field programmable gate array(FPGA)system can be reconfigured easily and quickly to meet a new requirement by dragging and dropping pre-built components in a SoPC building environment.As a result,the controller platform is more recon- figurable in terms of algorithms and functions.This platform is implemented in a 3-axis milling machine control and the result indicates that the design and implementation presented in this paper is feasible.

面向国产高性能加速器的LLVM编译器设计及优化

国防科技大学自主研制的高性能加速器采用中央处理器(CPU)+通用数字信号处理器(GPDSP)的片上异构融合架构,使用超长指令集(VLIW)+单指令多数据流(SIMD)的向量化结构的GPDSP是峰值性能主要支撑的加速核。主流编译器在密集的数据计算指令排布、为指令静态分配硬件执行单元、GPDSP特有的向量指令等方面不能很好地支持高性能加速器。基于低级虚拟器(LLVM)编译框架,在前寄存器分配调度阶段,结合峰值寄存器压力感知方法(PERP)、蚁群优化(ACO)算法与GPDSP结构特点,优化代价模型,设计支持寄存器压力感知的指令调度模块;在后寄存器分配阶段提出支持静态功能单元分配的指令调度策略,通过冲突检测机制保证功能单元分配的正确性,为指令并行执行提供软件基础;在后端封装一系列丰富且规整的向量指令接口,实现对GPDSP向量指令的支持。实验结果表明,所提出的LLVM编译架构优化方法从功能和性能上实现了对GPDSP的良好支撑,GCC testsuite测试整体性能平均加速比为4.539,SPEC CPU 2017浮点测试整体性能平均加速比为4.49,SPEC CPU 2017整型测试整体性能平均加速比为3.24,使用向量接口的向量程序实现了平均97.1%的性能提升率。

一种高精度温度控制斯特林制冷器控制系统设计

通过对斯特林制冷机驱动控制器电路的分析和器件选型,设计了一款以DSP为核心控制芯片、硬件与软件相结合、可对斯特林制冷机进行高精度温度控制的电路。介绍了电路的设计思路、各模块组成和功能,提出了提高温度控制精度的方法,给出了实际测试结果。测试结果表明:所设计的斯特林制冷机驱动控制电路控温范围宽、高温特性好、控温精度高,具备一定的工程应用价值。

空间矢量脉宽调制方法的研究

分析了三相交流电机空间矢量脉宽调制的原理 ,探讨了采用空间矢量脉宽调制三相桥式电压型逆变器的电压输出能力。在集成DSP电机控制器ADMC331软硬件结构的基础上 ,编制了空间矢量脉宽调制软件 。

基于DSP高速信号处理器的空间电压矢量PWM技术的研究与实现

本文详述了空间电压矢量 PWM的原理 ,并对每一扇区矢量作用时间进行推导 ,最后在 TI公司生产的TMS3 2 0 F2 40 DSP高速信号处理器上进行了实现 。

基于扩张状态观测器的永磁无刷直流电机滑模变结构控制

根据无刷直流电机的数学模型和滑模变结构控制的特点,把换相引起的相电流变化当作外界对电机的干扰,建立了一个模型。根据此模型,构造了滑模变结构控制器,运用其对各种扰动不敏感的特性来抑制各种干扰对电机的影响。扩张状态观测器是一种性能良好的观测器,它不仅能得到不确定对象的状态,还能获得对象模型中内扰和外扰的实时控制量。电机的负载转矩用扩张状态观测器来准确估计,所以把它当作一个已知扰动来控制,这样提高了系统的控制精度。MATLAB仿真表明,与经典PID控制器相比,用滑模变结构控制器控制无刷直流电机,超调量小,速度响应快,且速度响应受电机参数变化影响小,各种外界干扰也得到了很好的抑制。用TMS320LF2407ADSP来搭建硬件电路,证明本控制器在实时控制中取得了很好的实验性能。

一种基于DSP的PMSM转子位置及速度估计新方法

在分析永磁同步电机数学模型的基础上,针对永磁电机无位置传感器运行的需要,提出了一种全数字化的基于估计坐标系的永磁同步电动机(PMSM)位置估算方法,并应用这种方法建立了永磁同步电机无位置传感器的矢量控制系统,在DSP芯片TMS320LF2407A上得到了具体验证和实现。该方案将电气稳态操作概念引入电机的状态估计中,有效解决了暂态过程中转子速度、位置估计不精确的问题。在讨论状态估计算法对电机参数依赖性的基础上,给出了估计误差补偿算法。该状态估计算法简单,计算量小,易于数字化实现。实验结果表明,所提出的PMSM无传感器控制方法具有较强的鲁棒性和令人满意的性能。

无刷直流电动机直接驱动系统动态特性分析

在推导了转子表面安装永磁体无刷直流电动机的数学模型的基础上，介绍了一种以集成数字信号处理器 ＡＤＭＣ ３３１为核心全数字矢量控制无刷直流电动机直接驱动系统。着重分析了电流参考信号超前角（滞后角）、系统参数和驱动方式对无刷直流电动机系统动态性能的影响。仿真及试验结果证明超前（或滞后）角的存在都会使系统的动态性能变差，无刷直流电动机系统处于磁场定向控制的情况下，电机的输出转矩最大，系统的动态性能最好；增大电流比例调节器增益和功率逆变驱动电路放大倍数可以使系统获得更好的动态性能；采用正弦波加三次、五次谐波的复合驱动方式时，系统的动态性能得到提高。

基于数字信号处理器的有源电力滤波器控制方案综述

有源电力滤波器(ActivePowerFilter,APF)是补偿电力系统谐波及无功功率的重要装置,其控制的实时性和准确性是实现有效补偿的一个关键。数字信号处理器(DigitalSignalProcessor,DSP)是一种实时计算速度快、精度高的控制器,能满足APF各种控制方案快速响应的要求,并可有效提高控制系统的实时性和准确性。文章介绍了基于DSP的空间矢量调制、滞环电流控制、单周控制、滑模控制、无差拍控制、重复控制、预测控制、模糊控制以及人工神经网络控制这几种APF控制方案的基本原理,指出了它们各自的优缺点。

基于真空断路器的并联电容器组相控投切装置

为了减小配电网中无功补偿并联电容器组投切时所引起的涌流和过电压,开发了一种基于永磁机构的相控真空断路器系统,包括断路器本体和同步控制器。控制器硬件以数字信号处理器(DSP)TMS320LF2407A为核心,采用模块化设计思想,具有良好的抗干扰性。分析了断路器的机械特性、介质绝缘特性以及控制系统精度对相控投切效果的影响。系统实时采集电网参数并采用平均序列交越零点相位差分算法提取参考信号相位信息,配合合适的投切策略,完成电容器组在预定相位投切。该断路器装置已经完成在系统试验站的大量相控投切实验,实验表明样机运行稳定可靠,达到了预期设计要求。

能量回馈式PWM整流器并网的工程设计方法

论述了能量回馈式PWM整流器并网时的同步电流PI控制技术,提出改善馈网电流质量的几种关键的工程设计方法,包括软件滤波、防积分饱和PI控制、简单死区补偿和单位功率因数控制等。基于DSP和CPLD设计了控制系统,实现了上述设计方法,并应用于2.5kW的能量回馈式电子负载。实验结果表明,所提出的工程设计方法有效地改善了馈网的电流质量,使电流波形近似为正弦波且功率因数接近?1。

400Hz 恒压恒频逆变器的一种模糊-重复混合控制方案(英文)

针对400Hz 恒压恒频(CVCF)逆变器,提出了一种模糊-重复混合控制方案。模糊PD 控制器用于改善系统处于振荡或过冲时的动态性能,重复控制器用于稳态时输出高质量的正弦电压。因此模糊PD 控制器和重复控制器的混合可以利用它们各自的优点,该控制方案采用TI 的DSP 芯片TMS320F240 在一台400Hz、5.5kW 样机上得以实现。实验结果验证了所提出的控制方案不仅能在稳态时获得低THD的输出电压,而且在负载突变时获得了较好的动态性能。

基于TMS320F28335的SVPWM实现方法

在空间矢量脉宽调制(Space Vector Pulse Width Modulation,简称SVPWM)基本原理的基础上,详细介绍了用数字信号控制器TMS320LF28335生成SVPWM波的控制方法。通过软硬件结合,在DSP调速平台上进行调试和实验验证,并给出波形。实验证明,利用TMS320LF28335实现SVPWM波据具有控制算法简单,速度快,实现方便等优点,能更好地满足功率器件对驱动信号的不同要求。

基于DSP的SVPWM的研究

对空间矢量脉宽调制(SVPWM)的理论进行了较详细的讨论。利用DSP电机控制器TMS320F240分别用硬件和软件方式实现了SVPWM,分析了两种方法的优缺点,并给出了相应的实验结果,该方法速度快,精度高。

三相三线有源电力滤波器滞环电流控制策略

滞环电流控制是三相四线有源电力滤波器(APF)常用的电流控制方法,但在三相三线APF中应用不够成熟。分析了三相三线APF滞环电流控制策略的原理及可行性,给出了滞环控制中关键参数的设计和选择方法。通过对开关模态及三相电流关系的分析,推导出了三相三线APF直流侧电压选择的理论参考公式。在此基础上提出一种基于双数字信号处理器的APF数字滞环电流控制方法,实现了全数字化三相三线APF的滞环电流控制,实验结果证明了该方法的有效性。