Power management and design optimization of fuel cell/battery hybrid vehicles

Power management strategy is as significant as component sizing in achieving optimal fuel economy of a fuel cell hybrid vehicle (FCHV). We have formulated a combined power management/design optimization problem for the performance optimization of FCHVs. This includes subsystem-scaling models to predict the characteristics of components of different sizes. In addition, we designed a parameterizable and near-optimal controller for power management optimization. This controller, which is inspired by our stochastic dynamic programming results, can be included as design variables in system optimization problems. Simulation results demonstrate that combined optimization can efficiently provide excellent fuel economy.     

线性规划的灵敏度分析在发输电系统可靠性评估中的应用

本文推导了发输电系统最大供负荷能力的线性规划模型及发输电系统可靠性评估模型.详细讨论了线性规划的灵敏度分析在发输电系统可靠性评估中的应用.根据本文给出的模型和方法,对某系统进行试算。计算结果表明,本文的模型和方法具有计算简单的特点.     

多级制冷系统超结构优化及其应用研究

在多级制冷系统超结构的基础上，以年操作费用与设备年折旧费用之和的年度总费用最低为目标函数，建立了多机制冷系统优化的混合整数非线性规划。利用该模型对乙烯裂解装置乙烯-丙烯复叠制冷系统进行了优化研究，优化后系统比原制冷系统年度总费用下降15%，经济效益明显。     

Model predictive control for wind power gradients

We consider the operation of a wind turbine and a connected local battery or other electrical storage device, taking into account varying wind speed, with the goal of maximizing the total energy generated while respecting limits on the time derivative (gradient) of power delivered to the grid. We use the turbine inertia as an additional energy storage device, by varying its speed over time, and coordinate the flows of energy to achieve the goal. The control variables are turbine pitch, generator torque and charge/discharge rates for the storage device, each of which can be varied over given ranges. The system dynamics are quite non‐linear, and the constraints and objectives are not convex functions of the control inputs, so the resulting optimal control problem is difficult to solve globally. In this paper, we show that by a novel change of variables, which focuses on power flows, we can transform the problem to one with linear dynamics and convex constraints. Thus, the problem can be globally solved, using robust, fast solvers tailored for embedded control applications. We implement the optimal control problem in a receding horizon manner and provide extensive closed‐loop tests with real wind data and modern wind forecasting methods. The simulation results using real wind data demonstrate the ability to reject the disturbances from fast changes in wind speed, ensuring certain power gradients, with an insignificant loss in energy production. Copyright © 2014 John Wiley & Sons, Ltd.     

用VB实现工程设计技术文档的打印输出

本文给出了用Ｖｉｓａｕａｌ Ｂａｓｉｃ６．０编程实现工程技术文档的打印输出的基本思路,并以工程设计文档中最常见的设计计算说明书为例介绍如何实现其打印输出的方法。     

Initialising distillation column models

Difficulties associated with the optimisation of distillation column models by non-linear programming are considered. The paper presents a systematic procedure to enable these difficulties to be overcome and proposes a particular formulation of the distillation column model. A certain limiting case of the column model is examined, that of infinite reflux or zero feed. This limiting case considerably simplifies the model and provides a system of non-linear equations that is readily solved. The solution of this problem gives useful information about the purity that can be achieved in the general case and the number of plates needed to attain a given level of purity. The limiting problem provides starting values for the solution of the general column and suggests a homotopy that can be followed if difficulties arise in obtaining convergence. To obtain a stable form of the limiting case requires the general column model to be formulated in a certain way, which to our knowledge has not previously been considered. The ideas have been successfully tested on various multi-column flowsheets involving distillation columns with heat integration.     

迭代动态规划在树脂牌号切换最优化模型中的应用

本文运用迭代动态规划求解牌号切换模型的最优化问题,有效地避免了运用一般方法求解系统最优化问题时的Ｈａｍｉｌｔｏｎ－Ｊａｃｏｂｉ－Ｂｅｌｌｍａｎ方程以及高维系统可能出现的计算量激增的问题,成功地解得树脂牌号切换过程产生的过渡料数量最少时聚合温度、氯气和共聚单体的浓度、催化剂流率和料位高度等５个操作变量的最优轨迹。     

面向对象程序设计方法探讨及实例——《南京市劳动局劳动保护信息系统》的开发

面向对象的程序设计 ,已成为最具潜能的开发工具及环境 ,它需要针对具体的应用领域 ,选择合理的开发策略 ,本文就面向对象的基本概念和开发过程作了阐述 ,并结合具体的开发实例给出了解决问题的思路和示例     

搪瓷釉配方优化设计的通用方案

本文介绍了一种由计算机实现的配方优化设计方法,并给出了一个简单的通用优化方案。经实际运行证明,该方案是一个简单可行,易于推广的通用优化方案。     

用于可视化编程的柔性直流控制保护系统研制

采用可视化编程的控制保护系统相比于传统微机编程方法的控制保护系统具有运维方便、开发高效的优点。但用于可视化编程的控制保护系统常需要同步对多DSP编程,传统直流控制保护系统难以满足其对实时性、多线操作和兼容性的需求。针对这些问题,分析了柔性直流控制保护系统可视化编程的特征,提出了一种适用于可视化编程的柔性直流控制保护系统,设计了可实现多线操作的可视化编程的软硬件系统,最终,在RT-LAB仿真实验平台上进行了实验验证。实验结果表明所研制的控制保护系统功能满足直流输电工程应用的标准,实现了多线操作和独立总线通信等功能,兼容性强和实时性高,具有极高的工程应用价值。