电动汽车换电站时序响应能力模型与充电计划制订策略

由于蓄电池具有良好的储能特性以及可控性,电动汽车换电站运营商在满足换电需求的前提下,可以响应电网企业的激励措施,达到系统运行的要求。首先,根据换电站内电池组的状态参量,建立电池组的状态矩阵;其次,将电池组进行状态分群,对其中处于可控状态的电池组实施控制;最后,运用递推的思想研究该换电站内备用电池组的可控负荷裕度带,进而指导换电站运营商根据电网企业的运行目标制订相应的充电计划,达到负荷平衡、改善区域负荷特性等目的。     

经验Gramian平衡降阶在电力系统中的改进及应用

经验Gramian平衡降阶方法正逐步应用于电力系统的非线性控制设计。如何获得有效经验可观可控Gramian矩阵,是该方法应用的核心,对降阶效果有着很大影响。为进一步提升该方法的降阶效果,建立了电力系统非线性动态模型,分析了所研究问题与控制量选取及降阶对象之间的关系。考虑了电力系统状态量及控制量变化特点,提出了一种方案用于确定各状态量和控制量的扰动值,形成了包含丰富系统动态行为信息的经验可观可控Gramian矩阵。通过研究某实际电网验证该方案可行有效,研究表明相比原方法,所提方案在保证降阶误差上界的前提下,能够进一步有效减少模型阶数,其降阶效果得到明显提升。     

Regular Elements and Global Controllability in SL(d, R)

We introduce a generalized concept of split-regular elements and study the dynamics of such elements on the flag manifolds corresponding to the Lie group SL(d, R). Based on these concepts, we obtain the stable and unstable manifolds, the Morse decomposition, and obtain the limit sets inside the corresponding control sets. These dynamical aspects are studied with the purpose of applying them in order to extend a result of global controllability of discrete-time bilinear systems defined by elements of sl(d, R).     

基于计划行为理论的网络消费行为研究

为了探索中国网络消费行为,本研究以计划行为理论为基础,围绕网络消费中获得信息和购买产品行为,联系便利状况的影响因素,对270个样本进行网络问卷调查并提出对应的理论模型,最后利用结构方程模型软件(AMOS)进行验证性因素分析.研究结果显示感知行为控制(PBC)能够决定意图,但对行为没有直接影响,两个前行变量自我效能和可控...     

An improved algorithm for optimal state regulation of generalized systems

The system considered is a generalized system E = Ax + Bu, Y = Cx with matrix E singular. When the impulsive modes of the system are both controllable and observable, it is shown in this paper that these modes can be eliminated by almost any constant output feedback. For a strongly controllable and observable generalized system, after its impulsive modes are eliminated, the poles of the system can be assigned arbitrarily by state feedback. Even if the states are not available, the paper adopts an efficient method to design a compensator for the system.     

广义控制系统的强能控性与强能观性

本文考虑正则广义控制系统的强能控性与强能观性,在不分解原系统的情况下,用原系统参数给出了一些新的判定条件。     

Feedback controllability assessment and control of particle size distribution in emulsion polymerisation

In this article, the importance of particle size distribution (PSD) control as a means for the inferential control of the rheology of emulsion polymers is illustrated. A controllability assessment is presented to illustrate the attainability or otherwise of bimodal PSD using feedback control through a consideration of the process mechanisms—measurement limitations and process constraints that prevent the implementation of feedback corrections. The suitability of a batch-to-batch iterative feedback PSD control is demonstrated, which could act in addition to any in-batch feedback control, the latter being less feasible in certain cases, as argued in this article. A detailed population balance model is used for the batch-to-batch control, which simplifies model update and feedback correction.     

结构控制系统的模态能控度及其计算方法

根据结构控制系统的特点,提出了结构控制系统模态能控度的概念,进而提出了对各解耦子空间状态向量的规范化处理,并给出了规范化因子的计算公式。在此基础上,得到模态恢复区域任一方向上边界点向量的解析表达式。由此求出的模态恢复区域、模态能控度,是其真值的最佳逼近值。因此,本文发展和改进了Viswanathan C N 等提出的能控度概念及其计算方法,为应用能控度准则判断结构控制系统作动器配置方案的优劣,提供了一个可靠的工具。本文给出一个颤振主动抑制系统不同控制面配置方案模态能控度计算、比较的算例。