Stability analysis of discrete-time systems with actuator saturation by a saturation-dependent Lyapunov function

In this paper, stability of discrete-time linear systems subject to actuator saturation is analyzed using a saturation-dependent Lyapunov function. This saturation-dependent Lyapunov function captures the real-time information on the severity of actuator saturation and leads to less conservative estimate of the domain of attraction, which is based on the solution of an LMI optimization problem. Numerical examples are presented to show the effectiveness of the proposed method.     

Dynamic anti-windup based control method for state constrained systems

Based on the dynamic anti-windup strategy, an alternative control methodology for state constrained systems is presented. The proposed method is an a posteriori approach for state constrained systems, which is differentiated from the usual a priori approach. That is, first a linear controller is designed to show a desirable nominal performance by ignoring state constraints. Then, an additional compensator is introduced to account for state constraints. By minimizing a reasonable performance index, a dynamic compensator is derived explicitly, which is expressed in plant and controller parameters. The proposed method not only provides a graceful performance degradation, but it also guarantees the total stability of the resulting systems. An illustrative example is given to show the effectiveness of the proposed method.     

YFe10.5-xMnxMo1.5化合物的结构和磁性

利用X射线衍射和磁性测量研究了Mn替代Fe对YFe10.5Mo1.5金属间化合物的结构和磁性的影响。X射线衍射表明，YFe10.5-xMnxMo1.5(x=2.5，3．0，4.0，5.0)化合物均为ThMn12型四方结构，晶格常数和单胞体积均随Mn含量增加而单调增大。磁性测量表明，YFe10.5-xMnxMo1.5化合物的居里温度随Mn含量的增加而逐渐降低；在4．5K温度下，化合物的饱和磁化强度随Mn含量增加而减小。     

考虑磁路饱和的永磁式同步电机计算

介绍一种考虑到磁路饱和的永磁同步电机转矩和电抗的计算方法。该方法利用有限元法对二维磁场进行数值解析，并给出包含正交磁化现象影响的d、q轴方程式。通过改变转子的位置计算水磁同步电动机的转矩和电抗，给出了转矩和电抗随转子位置变化规律的曲线。实验结果验证了其计算方法的正确性。     

套管式电流互感器在二次设计中的合理选择

针对套管式电流互感器铁芯易饱和,引起测量误差增大及保护装置误动或拒动,提出了测量用电流互感器和保护用电流互感器的不同选择方法在设计中的应用.     

几种母线保护原理及运行分析

对整流型、中阻抗型、微机型等母线保护原理进行了分析，阐述了几种母线保护的各自特点，并提出母线保护在运行和维护中的注意事项。     

考虑发电机饱和特性时的励磁系统建模与仿真研究

着重研究发电机励磁系统建模和辨识中的发电机饱和问题,并给出详细的论述和解决方法。将该方法应用于实际情况,以华能412MW汽轮机组为例,对其进行建模和参数辨识,辨识结果通过Matlab和PSSE仿真验证,可以很好地反映实际运行状况,符合实际系统的要求,从而证明了该方法的有效性。     

CVT中阻尼器的研究

阐述了电容式电压互感器的各种阻尼器的优缺点,并对速饱和阻尼器设计进行了详述,提出了CVT设计速饱和阻尼器应注意的事项。     

Neuronal Signal Transduction Aided by Noise at Threshold and at Saturation

A classical model of neuronal signal transmission describing the presence of both a threshold and a saturation in the neuron response is considered. This model is used to analyze the transduction by the neuron of various types of information-carrying input signals in the presence of noise. Improvement by noise of the performance via stochastic resonance is established for transmission in both the threshold and the saturation regimes. Stochastic resonance at saturation is a novel form, expressing that the distortion experienced by large input signals transmitted at saturation, can be reduced by addition of noise.     

Anti-windup control design for exponentially unstable LTI systems with actuator saturation

In this paper, a new saturation control technique in the framework of anti-windup compensation is developed for exponentially unstable linear time-invariant systems subject to input nonlinearities. The proposed control algorithm guarantees regional stability in the existence of input saturation, and provides less conservative performance than most existing anti-windup schemes. Moreover, an explicit form of anti-windup controller with its order no more than the order of the plant is derived. An inverted pendulum example is used to demonstrate the advantages of the newly proposed anti-windup control technique.