无差拍控制在单相逆变电源中的应用研究

首先介绍了无差拍控制单相逆变电源的原理,然后对带状态观测器的无差拍控制策略进行了仿真和实验,得出了该数字控制方法应用于单相逆变电源具有良好的动态性、稳定性及负载适应能力.     

一类离散时间切换线性系统的无差拍控制

研究一类带多控制器和多传感器离散时间线性系统的无差拍控制.对能控系统,通过适当的状态坐标变换获得系统矩阵的块三角结构,再设计状态反馈和周期切换策略使得状态反馈矩阵在有限周期内为零,从而保证闭环系统的无差拍稳定.进一步,对能观系统,设计具有有限时间精确估计的动态输出反馈,通过适当的周期切换策略实现闭环系统的无差拍稳定.最后,给出一个例子以验证所提设计方法的有效性.     

基于ESO分数阶滑模调节的PMSM模型预测转矩控制

为了提高永磁同步电机调速系统的性能,提出一种基于扩张状态观测器的分数阶滑模预测转矩控制策略。采用扩张状态观测器对电机的综合扰动项、定子电流和反电动势进行实时观测,可快速准确得到它们的估计值并进行补偿;利用估计值构建分数阶滑模控制器来削弱系统抖振并提高鲁棒性;利用转矩和磁链无差拍预测控制,减少了遍历次数并降低了计算复杂度。通过仿真和半实物平台进行了验证,所得结果表明,所提出的方法能有效提升系统的鲁棒性,使电机具有良好的动态和静态性能。     

双环反馈控制UPS逆变电路的设计与仿真

抽象UPS实际电路建立被控对象模型,利用电压电流双环反馈控制策略,构造双闭环反馈控制系统;设计电流、扰动观测器以补偿时延和扰动,推导无差拍电流控制器;电压控制器采用比例积分控制器;利用MATLAB软件仿真电路,分析性能。     

带降维状态观测器控制系统的鲁棒性

本文讨论了带降维状态观测器控制系统的鲁棒性。给出了带降维状态观测器控制系统的三个重要的频域性质和一个定理,同时给出了降维状态观测器极点配置方法。     

基于最小拍观测器的自抗扰控制器设计与性能分析

自抗扰控制器设计中,扩张状态观测器需要较高的观测带宽,才能更快的观测出状态变量.本文采用最小拍观测器,使得其具有最快的观测速度.以2阶系统为例,得到了离散系统下,基于最小拍观测器的自抗扰控制器的等价复合控制模型,其开环补偿器等价为超前校正器.仿真结果表明,基于最小拍观测器的自抗扰控制器可以最快的观测出系统状态变量,且控制器带宽的选取一般应小于采样周期的倒数.由于不再需要设计观测器带宽,从而简化了参数设计.     

基于非光滑观测器的迟滞三明治系统状态估计

针对带迟滞的三明治系统特点,构建了一种非光滑观测器以对系统状态进行估计.首先根据带迟滞三明治系统的特点,采用分离原理,建立了描述系统特性的非光滑状态空间方程.据此构造了能够随系统工作区间变化而自动切换的非光滑观测器,给出了相应的收敛定理及其证明.最后通过仿真,分别比较了非光滑观测器和传统的观测器对状态的跟踪效果,比较结果表明非光滑观测器对于带迟滞三明治系统状态变量估计的准确性要优于传统的观测器.     

一类带降维状态观测器控制系统的鲁棒性

本文对一类带降维状态观测器的线性控制系统的鲁棒性进行了分析,把文献〔1〕的结论推广至一类带降维状态观测器的控制系统.给出了观测器极点的配置方法,并通过一个简例说明:在配置降维状态观测器的极点时,必须综合考虑系统快速性(及噪声抑制)和鲁棒性的要求.     

基于非光滑观测器的带死区三明治系统状态估计

在控制工程实际中,许多含有死区的系统可以用带死区的三明治系统描述．本文针对带死区的三明治系统特点,构建了一种非光滑观测器以对系统状态进行估计．首先根据带死区三明治系统的特点,由分离原理,建立了描述系统特性的非光滑状态空间方程．据此构造了能够随系统工作区间变化而自动切换的非光滑观测器,给出了相应的收敛定理及其证明．最后通过仿真,分别比较了非光滑观测器和传统的观测器对状态的跟踪效果,比较结果表明非光滑观测器对于带死区三明治系统状态变量估计的准确性要优于传统的观测器．     

不平衡工况下三相四桥臂逆变器的控制策略

针对无差拍控制跟踪精度低、抗扰动性差等问题,提出将重复控制与无差拍控制结合,形成嵌入式复合控制结构,改善控制器的稳态精度和对电感参数变化的鲁棒性。根据四桥臂逆变器的数学模型,推导用于电流控制的无差拍算法,并引入重复控制算法。最后,通过仿真和实验验证了策略的有效性。     

The design of deadbeat controllers by state transition graph

Two kinds of deadbeat control problems are considered. One is the state deadbeat control problem and the other is the pointwise minimum-time deadbeat control problem. A simple graph called the state transition graph of a matrix is introduced, and simple algorithms based on it giving deadbeat controllers are presented. The set of pointwise minimum-time deadbeat controllers is characterized. The set of output feedback deadbeat controller is also considered     

Deadbeat观测器的一种新的设计方法及实现

ｄｅａｄｂｅａｔ观测器由于极点在原点而具有系统阵幂零的性质,本文充分利用这一性质,针对离散线性系统,提出了一种新的ｄｅａｄｂｅａｔ观测器设计方法,该方法直接利用的Ｉ／Ｏ数据估计系统内部状态,无需对系统状态有个寝估计,相应的也就可以不受寝估计误差的影响,文中给出了该观测器的具体实现步骤,并通过仿真验证了所提出方法的正确性与有效性。     

State deadbeat control of nonlinear systems: Construction via sets

A geometric generalization of the discrete-time linear deadbeat control problem is studied. The proposed method to generate a deadbeat tracker for a given nonlinear system is constructive and makes use of sets that can be computed iteratively. For demonstration, derivations of the deadbeat feedback law and tracker dynamics are provided for an example system. Based on the method, a simple algorithm that computes the deadbeat gain for a linear system with scalar input is given.     

Explicit parameterization of state deadbeat controllers

A general state deadbeat control problem, not restricted to the controllability indexes, is posed and solved. A result for the explicit parameterization of deadbeat controllers is obtained. With the parameterization, only the genuine independent free parameters appear in the deadbeat controllers     

Parametrization of all ripple-free deadbeat controllers

This paper is concerned with deadbeat control in sampled-data systems. Deadbeat control achieves finite-time settling (deadbeat settling) at sampling instants, but there may exist error called ripple “between” sampling instants even after the response is settled “at” sampling instants. The objective of this paper is to give a parametrization of all ripple-free deadbeat controllers (controllers which achieve deadbeat settling without ripple) in sampled-data systems. It is also shown that the following holds in general: minimum-time deadbeat control causes ripple when the pulse transfer function to be controlled has stable zeros.     

On deadbeat controllers

The possibility of achieving a deadbeat regulation and tracking in linear multivariable systems independently of their initial conditions is investigated. Necessary and sufficient conditions for the existence of various deadbeat controllers are established in a constructive way. A detailed analysis of the control sequence generated by any deadbeat controller is then presented.     

A note on parameterization of the class of deadbeat controllers

The problem of parameterizing the class of deadbeat controllers for a given discrete-time system through the minimum number of parameters was solved by Schlegel [1]. This note shows how to utilize the above solution to study some problems in designing deadbeat controllers. First, an algorithm is developed to compute a controller which minimizes-in an average sense-a given objective function. Second, a necessary and sufficient condition is given for the existence of an output deadbeat controller. Finally, the problem of parameterizing the set of deadbeat controllers for those systems transformable to the phase-variable block-canonical form is reconsidered.     

Deadbeat control of linear multivariable generalized state-spacesystems

The classic idea of deadbeat control is extended to linear multivariable discrete-time generalized state-space systems using algebraic methods. The asymptotic properties of the linear quadratic regulator theory are used to obtain the classes of deadbeat controllers using stabilizing full semistate feedback. The solution is constructed from a `cheap control' problem. Both semistate and output deadbeat control laws are considered. The main design criteria are to drive the semistate and/or outputs of the system to zero in minimum time and that the closed-loop system be internally stable. Unique properties of these types of control laws are discussed. For semistate deadbeat control, all the (dynamic) poles including the ones at infinity are moved to the origin, whereas for output deadbeat, some of the finite transmission zeros are canceled. Numerically reliable algorithms are developed to solve both problems     

无差拍控制策略在数字化UPS逆变系统中的应用

为了改善逆变电源的输出性能.提高逆变电源输出响应速度和精度,研究了无差拍控制策略地数字化UPS(Uninterruptible Power Supply)逆变系统中的应用.给出了无差拍控制的数学建模方法,并采用Matlab/Simulink进行了仿真研究.经过理论分析和仿真结果表明,采用无差拍控制策略设计的控制器用于逆变电源系统具有的突出优点是响应速度快,可大幅提高系统的动态响应性能.     

Continuous-time deadbeat control for sampled-data systems

In this paper, the continuous-time deadbeat control problem for the sampled-data systems is considered. We derived the class of all controllers that achieve the continuous-time deadbeat control