基于转速自适应的宽调速直流调速装置

本文介绍了一种克服直流伺服系统在极低转速下的静摩擦等非线形因素的带速度自适应控制器的单一速度环调节器速度调节器。它可使系统的调速范围达到1:10000。     

基于转速自适应的宽调速直流调速装置

本文介绍了一种克服 直流伺服系统在极低转速下的静摩擦等非线形因素的带速度自适应控制器的单一速度环调节器速度调节器。它可使系统的调速范围达到１：１００００。     

基于MATLAB直流双闭环调速系统仿真研究

通过分析直流调速系统的组成,采用工程设计法对调速系统的电流和转速两个调速器进行设计。设计各环调节器,选择调节器结构,计算调节器参数,找出理论参数和Simulink中建模仿真之间存在的差距,再对调节器的具体设计。最后对系统的起动过程进行建模仿真,了解系统动态性能。     

基于直流无刷电机的雷达伺服系统设计

介绍了连续扫描工作的长寿命伺服系统设计与实现,选用无刷电机作为执行元件并选用无刷旋转变压器作为测角反馈元件来实现长寿命要求。文中描述了直流无刷电机的Matlab模型和基于无刷电机的雷达伺服系统仿真模型。伺服系统的校正运算通过PI调节器实现,参数通过系统仿真决定,简化了系统参数的设计。仿真模型中考虑了结构谐振,用以保证调节器的可实现性。功放电路由单路PWM经FP—GA分离出6路开关信号来控制,简单可靠。从系统的实际工作数据结果来看达到了较好的控制性能。     

雷达伺服系统建模与仿真

针对某型雷达伺服系统所采用的直流力矩电机模型,利用 MATLAB 进行了电流环、 基于液浮速率积分陀螺的速度环以及位置环仿真设计。最后利用跟踪模拟航路验证了仿真设计的有效性。     

微型天线伺服系统保主导极点配置控制器设计

给出了一种微型天线伺服系统保主导极点配置PID控制器设计方法.首先,针对伺服系统的动态方框图模型,将其划分为电流环、速度环和位置环3个设计环节.然后,通过引入前置滤波器,根据主导极点配置PID控制器设计方法,设计了每个环节的控制器参数,使之满足期望的性能指标要求.仿真结果表明,所设计的伺服控制器能够保证系统对给定位置信...     

基于ADRC和NLPID的稳瞄系统伺服控制器的设计

为满足某新型稳瞄伺服系统控制精度的要求,重新设计该系统的伺服控制器。在简要描述该稳瞄伺服系统的结构及工作原理的基础上,对系统的各个模块建立数学模型。提出将自抗扰控制器应用于系统的速度环,将经过改进的非线性PID(NLPID)控制器应用于电流环,并在Matlab/Simulink仿真环境下结合S-Function模块对系统进行仿真研究。仿真结果表明,所设计的控制器不仅跟踪精度高,而且具有较好的扰动隔离性能以及很强的适应性和鲁棒性,为高精度稳瞄伺服系统的进一步研究提供理论参考。     

稳定环在“动中通”伺服系统中应用的仿真研究

为了提高"动中通"伺服系统的性能,分析了伺服系统对扰动的响应,并且根据扰动的特点.设计了利用稳定环隔离扰动的策略,并在Maflab/Simulink软件中建立了利用稳定环克服扰动的仿真模型,进行了仿真实验.仿真结果表明,引入稳定环后,系统性能有了明显的提高;而且减小了系统响应的振荡,提高了系统的稳定性.为"动中通"伺服系统的改进提供了直接依据.     

基于改进滑模策略永磁同步电机SVM-DTC控制

传统的永磁同步电机直接转矩控制采用双滞环结构,因而电机转矩和磁链脉动较大。SVM控制方法通过合成最合理的电压矢量对转矩和磁链作精确补偿,能够一定程度上降低二者的脉动,但传统SVM控制方法包含了转速和转矩两个PI调节器,两个调节器的参数设计比较复杂,且直接影响了电机性能。提出用快速终端滑模（FTSM）控制器来代替传统PI转速调节器,为了克服滑模带来的抖振,设计负载转矩观测器,并将观测值反馈至滑模控制器。仿真和实验结果表明所提控制方法改善了系统的动静态性能,抗干扰能力增强,同时SMC固有抖振现象得到有效抑制。     

PDFF调节在矢量控制的PMSM中的应用

在永磁同步电机的矢量控制基础上,介绍了改进的PI控制方法即PDFF。针对PMSM速度环采用PDFF控制并进行了Matlab／Simulink仿真,结果表明了PDFF调节具有较好的响应和抗扰能力,也为实际伺服系统的良好性能设计和调试提供了新的思路。     

利用逆序循环实现FFT运算中倒序算法的优化

在数字信号处理中,FFT运算所占角色日趋重要。FFT的运算性能可以在很大程度上影响整个信号处理系统的性能。传统FFT算法中需要进行倒序以得到正确结果。倒序的运算速度取决于两个方面:逆序数的计算效率及取数存数时间。本文提出了逆序循环的概念并在此基础上提出一种新的倒序优化算法。在MPC7400芯片上进行的实验表明,采用本文提出的方法可以大大提高传统倒序算法性能。     

A microcontroller-based induction motor drive system using variablestructure strategy with decoupling

The sliding-mode control concept is applied in the outer loop of a speed drive system utilizing a series-connected wound rotor induction machine (SCWRIM). A design procedure is outlined for the sliding-mode speed controller. The methods of decoupling and torque linearization for the SCWRIM are derived using the field-orientation as well as the torque angle control concepts. Sliding-mode control with cascaded integral operation is used to reduce torque chattering and steady-state error. Accelerator sliding lines are introduced to enable better utilization of the torque capability of the drive system. The parameter-insensitive response provided by this method of control is demonstrated. The effects on the dynamic and static performance with varying drive inertia and load disturbance are studied and compared with the conventional approach using PI control. The influences of sampling effects on sliding-mode control performance are also illustrated and discussed. Microcontroller-based implementation of the speed drive system is employed. Both simulation and experimental results are presented     

Analysis and optimisation of the convergence behaviour of the single channel digital tanlock loop

The mathematical analysis of the convergence behaviour of the first-order single channel digital tanlock loop (SC-DTL) is presented. This article also describes a novel technique that allows controlling the convergence speed of the loop, i.e. the time taken by the phase-error to reach its steady-state value, by using a specialised controller unit. The controller is used to adjust the convergence speed so as to selectively optimise a given performance parameter of the loop. For instance, the controller may be used to speed up the convergence in order to increase the lock range and improve the acquisition speed. However, since increasing the lock range can degrade the noise immunity of the system, in a noisy environment the controller can slow down the convergence speed until locking is achieved. Once the system is in lock, the convergence speed can be increased to improve the acquisition speed. The performance of the SC-DTL system was assessed against similar arctan-based loops and the results demonstrate the success of the controller in optimising the performance of the SC-DTL loop. The results of the system testing using MATLAB/Simulink simulation are presented. A prototype of the proposed system was implemented using a field programmable gate array module and the practical results are in good agreement with those obtained by simulation.     

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.     

大功率转子侧变频调速系统的控制策略研究

为了提高系统的静态调速特性并且获得较好的系统动态调速性能,通过分析变频调速的工作原理,对大功率转子侧变频调速系统的双闭环调速系统数学模型,设计了转速、电流双闭环PI调节器,仿真研究验证了所设计方法的有效性。     

基于Simulink的火炮伺服系统自抗扰控制仿真

为了解决火炮伺服系统存在负载变化大、冲击扰动力矩强等问题,将自抗扰控制技术应用到火炮伺服系统位置控制器中。该控制算法通过实时估计与补偿来弥补传统控制方法的不足。通过在Simulink软件平台搭建了ADRC的火炮伺服系统三环模型,仿真结果对比传统PID控制。对比结果表明,基于ADRC的系统超调小、响应速度较快、具有较强的鲁棒性。     

Speed-sensorless control system of a bearingless induction motor based on iterative central difference Kalman filter

ABSTRACT

In order to obtain speed self-detecting with low cost for a bearingless induction motor (BIM) a speed-sensorless control strategy based on the iterative central difference Kalman filter (ICDKF) is proposed. Firstly, on the basis of the BIM mathematical model, the nonlinear state equation is established and its order is reduced from fifth-order to fourth-order using the stator terminal voltage and current as input. Then, a sterling interpolation formulation is used in the filter to reduce the model error, and an iteration loop link is adopted to improve the filter accuracy. Finally, the online speed of the BIM is identified through the filter rotor speed estimation. Theoretical analysis, simulation and experimental results by UKF and CDKF method have been compared. The results show that the proposed speed-sensorless control system not only has good speed tracking performance and reduce the load disturbance but also improves the BIM suspension performance.     

无刷直流电机变频调速控制系统仿真研究

针对如何才能获得无刷直流电机的优良调速性能这一问题,设计了一种闭环控制系统,速度反馈控制使电机的运行性能更加稳定,控制器单元向逆变器提供脉宽调制信号、开关管的开关次序,从而实现了变频调速控制。此系统在Matlab/Simulink平台上进行了模型搭建及仿真,数值仿真结果表明,文中控制系统具有良好的可行性及有效性。     

基于改进的电流模型磁链观测器的异步电机矢量控制

本文首先讲述了交流调速的现状,阐述了矢量控制原理,采用转子磁链定向搭建磁链电流模型,最后搭建了带转矩内环的转速、磁链闭环矢量控制系统仿真模型。使用MATLAB仿真软件进行了仿真,并在原来仿真基础上修改了相关仿真参数,结果验证了基于电流模型磁链观测器的矢量控制策略的优越性能。     

Dual closed-loops current controller for a 4-leg shunt APF based on repetitive control

ABSTRACT

Current repetitive control strategy for a 4-leg APF is usually of a poor speed in responding to the drastic changes in load harmonic profile. In this paper, a dual closed-loop current controller composed of a repetitive control-based outer loop and a PI-based inner loop is proposed to improve the performance of a 4-leg APF, with a focus on response speed and harmonic current compensation gain. The principle of the dual loop controller is explained in detail, and the stability of the system is analysed thoroughly. To further decrease the inherent time delay associated with the PWM strategy, a zero-sequence-voltage-based PWM strategy is proposed to solve the complexity in the implementation of 3D-SVPWM methods. By formulating the relationship between the duty ratio of the neutral leg control pulse and the zero-sequence-component of the reference voltages, the duty ratios of the other three legs can be calculated conveniently. The simulation and lab experiment results are provided to verify the correctness and effectiveness of the proposed dual closed-loop current controller and the zero-sequence-voltage-based PWM strategy.