永磁同步电机模糊PI与PI控制性能的比较及仿真

采用32位的高性能DSP TMS320LF2407,系统采用速度环和电流环双闭环结构.电流环为模糊控制器,速度环为PI控制器,组成了模糊PI控制器.从仿真可以看出,同PI控制相比,模糊PI控制使永磁同步电机控制系统的抗干扰能力得到提高,增强了鲁棒性,动态性能得到改善.     

基于TMS320F2806的感应电机控制系统

设计了一种基于TMS320F2806无速度传感器的感应电机矢量控制系统,采用转子磁场定向,实现磁链与转矩的解耦控制,利用PI自适应控制原理控制速度和电流,通过磁通估算模块计算磁链和磁通角,然后通过开环速度估计模块估算转子的角速度。实验结果表明,该系统设计简单实用,性能良好。     

基于FPGA的直流电机速度控制器设计

介绍了一种基于ALTERA的FPGA(现场可编程门阵列)设计的直流电机速度控制器的设计方案及设计实现方法。在FPGA中实现电流和速度反馈数据的自动采集,同时设计了电流回路校正和速度回路校正模块,给出了控制器数据采集、算法实现及时序控制的实现方法。最后介绍了速度控制器的仿真及试验结果。该设计具有实时性强、响应速度快、集成度高、保护及时等特点。     

基于STC12C5A60S2的电流型PWM功率放大器设计

以STC12C5A60S2高性能单片机作为控制核心,设计一种单自由度电流型PWM功率放大器,具有集成度高、体积小和成本优势。霍尔电流传感器完成电流信号到电压信号转换,单片机内部2路10位精度A/D分别采样控制信号和测量信号。离散PI控制器对8位精度PWM模块进行占空比调节,控制电流上升和下降速度。采用Simulink对比仿真了三电平控制策略,测试结果和仿真数据相一致,反映出功率放大器的静态电流精度高、纹波小,动态响应速度可以满足实际应用。从而得出控制策略有效,实现方法可行,系统稳定性好。     

基于MC9S12DG128的寻线智能车系统设计

以飞思卡尔单片机MC9S12DG128为控制器,分别采用ov7620数字摄像头和旋转编码器进行路径图像提取和车速检测,设计了一种智能车系统,主要由路径检测模块、图像处理模块、电源模块、舵机控制模块、电机驱动模块和速度检测模块组成。采用PD控制算法,它可以自动调节PWM波的占空比,从而控制小车的转向和速度。试验结果表明,系统运行稳定可靠。     

有源电子滤波器迭代PI控制器的设计

电流跟踪控制器的设计是有源电子滤波器关键问题之一。电流跟踪控制器的给定为交流信号,本质属于随动系统。由于传统PI控制器在对交流信号的踪上存在静差,影响了有源电子滤波器的控制效果。本文分析研究了迭代PI控制器,证明了该控制器与重复控制的等价性。由于迭代PI控制器具有周期积分器,所以从根本上消除了传统PI的静差问题。文章最后通过Matlab仿真对比了两种控制方法的控制效果。     

永磁同步电机的双闭环调速系统设计

永磁同步电机因其优越的性能近年来得到了广泛应用。针对双闭环控制器参数整定困难所导致的控制效果不佳的问题,文中提出了基于极点配置和Ramp函数的改进型双闭环PI控制器。从永磁同步电机矢量控制算法的角度出发,建立了速度、电流双闭环解耦控制的系统模型,并在此模型下论述了速度环、电流环控制器的设计方法,给出改进后双闭环控制器参数的计算结果。对所研究方法分别进行了计算机仿真和实际试验,结果表明优化后的系统减小了系统过冲,缩短了稳定时间,提高了系统动态响应,具有良好的工程意义。     

光伏发电中并网系统的节能控制器的设计与实现

设计并实现光伏发电中并网系统的节能控制器,给出硬件软件设计流程。设计光伏并网方案模块分析获取的电压电流值,得到光伏阵列输出的最佳电流值,将该值反馈到并网电流管理模块中,对并网变流器输出电流实时调控,确保其处于最佳状态,使得并网电能的消耗最低化。通过小波分析方法检测光伏电网孤岛效应,并调控并网电流定位模块终止工作,避免能量的浪费,实现节能控制。实验结果表明,所设计控制器节能控制效果显著,可实现能耗的均衡。     

一种用于优化感应电机电流环的新方法

在感应电机转差频率矢量控制系统中,电流环的性能对整个系统响应的快速性和准确性有着重要影响,而电流环在两轴直流旋转(d-q)坐标系下存在交叉耦合,并且随着电源角频率的增大耦合成分增大,导致电流环特性变差。为此提出一种新的优化方法,即在传统PI电流控制器的基础上,设定合理的模糊规则并选取合适的PI参数kI,kP,对电流系统进行优化。在Matlab的Simulink模块下对电流系统建模仿真,仿真结果表明,设计的控制方法有效地降低了两轴之间的相互扰动,提高了电流控制系统的动态特性,且新方法简单易行,有较强的鲁棒性。     

基于改进重复控制的单相并联型有源电力滤波器

本文首先分析了并联型有源电力滤波器(APF)的拓扑结构及模型的建立。对系统的电流环进行分析,考虑各种因素而造成的时间延迟,对APF系统的幅频、相频特性有着较大的影响,为了能够弥补传统PI控制器在有源电力滤波器中应用的局限性,采用了重复控制器。首先阐述了重复控制器的作用原理,并结合PI控制器构成复合控制应用于APF当中;在原有PI控制器的基础上,加入重复控制器,并详细分析了复合控制器的设计过程。在所搭建的实验平台上,针对两种不同性质的负载,结合控制器设计的方法,对比了PI控制器和复合控制器的电流补偿效果,验证了控制方案的有效性。     

A modular control scheme for PMSM speed control with pulsating torque minimization

In this paper, a modular control approach is applied to a permanent-magnet synchronous motor (PMSM) speed control. Based on the functioning of the individual module, the modular approach enables the powerfully intelligent and robust control modules to easily replace any existing module which does not perform well, meanwhile retaining other existing modules which are still effective. Property analysis is first conducted for the existing function modules in a conventional PMSM control system: proportional-integral (PI) speed control module, reference current-generating module, and PI current control module. Next, it is shown that the conventional PMSM controller is not able to reject the torque pulsation which is the main hurdle when PMSM is used as a high-performance servo. By virtue of the internal model, to ify the torque pulsation it is imperative to incorporate an internal model in the feed-through path. This is achieved by replacing the reference current-generating module with an iterative learning control (ILC) module. The ILC module records the cyclic torque and reference current signals over one entire cycle, and then uses those signals to update the reference current for the next cycle. As a consequence, the torque pulsation can be reduced significantly. In order to estimate the torque ripples which may exceed certain bandwidth of a torque transducer, a novel torque estimation module using a gain-shaped sliding-mode observer is further developed to facilitate the implementation of torque learning control. The proposed control system is evaluated through real-time implementation and experimental results validate the effectiveness.     

基于TMS320F2812无刷直流电机控制系统设计

设计一种基于TMS320F2812的无刷直流电机控制系统;详细介绍了转子位置检测电路、相电流检测电路、驱动电路以及保护电路设计;给出相应的硬件电路.该系统采用三环控制.其中,位置环采用PI调节器;速度环采用参数自整定模糊PID控制:电流环采用电流滞环控制.该设计方案电路简单,可靠性强,具有较高的应用价值.同时,实验结果也验证了该方法的有效性.     

High-performance speed servo system considering Voltage saturation of a vector-controlled induction motor

Generally, a speed servo system of a vector-controlled induction motor has limitations of motor voltage and current. When the speed servo system has a large torque reference, the output of its PI controller is often saturated. In this case, the conventional servo system stops the integral calculation of its PI controller. However, this system often has a large overshoot and/or an oscillated response caused by both a windup phenomenon and phase error on the vector control condition. This paper proposes a new speed servo system considering voltage saturation for the vector-controlled induction motor. The proposed control method compensates the phase error on vector control condition quickly, and always keeps the vector control condition. The experimental results show that the proposed system well regulates the motor speed and the secondary magnetic flux for a large torque reference without a windup phenomenon.     

一种新颖的基于内模电流控制的矢量控制系统

无速度传感器矢量控制系统中存在两个关键性的问题，即速度辨识的稳定性问题和控制器结构问题。本文提出一种新型的基于模型参考自适应的内模电流控制的矢量控制系统。首先，利用MRAS理论，保证了速度辨识的全局稳定性。然后通过内模控制实现动态解耦，克服了PI控制不能动态解耦和其他解耦方法中对参数敏感的问题。仿真结果表明：系统对参数变化具有较强的鲁棒性，取得较好的解耦效果和系统控制性能。     

基于PIC18F4431的永磁BLDCM控制系统设计

随着无刷直流电机在运动控制领域应用越来越广泛,结合单片机的控制技术产生了新一代无刷直流电机控制技术。文中介绍了一种基于PIC系列单片机的高性能、低成本直流无刷电机控制系统,该系统利用PIC18F4431单片机的高速A/D采集模块、PWM模块和硬件乘法器实现了对PWM信号的产生、转子位置和速度的检测以及电流双闭环增量式PI控制,并对该控制系统的硬软件环节实现进行了阐述。模拟实验证明,该系统具有良好的动态性能与控制精度。     

Sensorless speed control of nonsalient permanent-magnet synchronous motor using rotor-position-tracking PI controller

This paper presents a new velocity estimation strategy of a nonsalient permanent-magnet synchronous motor (PMSM) drive without a high-frequency signal injection or special pulsewidth-modulation (PWM) pattern. This approach is based on the d-axis current regulator output voltage of the drive system that has the information of rotor position error. Rotor velocity can be estimated through a rotor-position-tracking proportional-integral (PI) controller that controls the position error to zero. For zero and low-speed operation, the PI controller gains of rotor position tracking controller have a variable structure according to the estimated rotor velocity. In order to boost the bandwidth of the PI controller around zero speed, a loop recovery technique is applied to the control system. The proposed method only requires the flux linkage of the permanent magnet and is insensitive to parameter estimation error and variation. The designers can easily determine the possible operating range with a desired bandwidth and perform vector control even at low speeds. The experimental results show the satisfactory operation of the proposed sensorless algorithm under rated load conditions.     

MATLAB/SIMULINK永磁同步电机无传感器矢量控制系统仿真

永磁同步电机矢量控制系统在电动汽车、轮船等交通运输领域具有广泛的应用前景。使用MATLAB/SIMULINK的仿真功能,采用模块化的设计结构,分别对速度环调节、电流PI（Proportion Integration）调节、SVPWM（Space Vector Pulse Width Module）波的产生、dq/αβ、双闭环的整个系统模型进行仿真研究。仿真在线调试,转子转速和转子转角、定子电流、以及转矩通过Scope模块进行观察,及时调整系统模型参数,使系统性能达到最佳化,实现了永磁同步电机矢量控制和正反转调速。结果表明该种控制方法具有很好的鲁棒性,且该种方法可以提高设计的效率并缩短系统设计时间。     

A high-performance sensorless indirect stator flux orientation control of induction motor drive

A new method for the implementation of a sensorless indirect stator-flux-oriented control (ISFOC) of induction motor drives with stator resistance tuning is proposed in this paper. The proposed method for the estimation of speed and stator resistance is based only on measurement of stator currents. The error of the measured q-axis current from its reference value feeds the proportional plus integral (PI) controller, the output of which is the estimated slip frequency. It is subtracted from the synchronous angular frequency, which is obtained from the output integral plus proportional (IP) rotor speed controller, to have the estimated rotor speed. For current regulation, this paper proposes a conventional PI controller with feedforward compensation terms in the synchronous frame. Owing to its advantages, an IP controller is used for rotor speed regulation. Stator resistance updating is based on the measured and reference d-axis stator current of an induction motor on d-q frame synchronously rotating with the stator flux vector. Experimental results for a 3-kW induction motor are presented and analyzed by using a dSpace system with DS1102 controller board based on the digital signal processor (DSP) TMS320C31. Digital simulation and experimental results are presented to show the improvement in performance of the proposed method.     

高压断路器三相永磁无刷直流电机机构控制算法研究

针对高压断路器三相永磁无刷直流电机机构,研究了不同控制策略下电机操动机构的运动特性.考虑高压断路器的分、合闸操作过程,建立了永磁无刷直流电机操动机构运动控制系统的仿真模型,采用数字式双闲环控制,内环为电流环,采用PI控制,外环为速度环,基于传统PID控制器、单神经元PID控制两种不同控制策略控制.通过对伺服控制系统的仿真分析得到了电机操动机构速度跟踪控制特性.结果表明,单神经元PID控制器能够较好的实现触头速度的跟踪控制,使其按理想运动特性曲线运动,是一种较理想、有效的控制方法.