机场油料库存控制仿真研究

对机场油料库存水平进行计算机仿真分析是提高机场油料保障能力的重要手段,也是新时期实现精确后勤、节约后勤的有效途径。经过对油料库存系统的动态研究,分析了该离散事件系统的数学特性,通过仿真试验输出的系统性能评价指标,量化了库存水平的评价标准,为系统优化提供了决策依据。实际算例表明,将所开发的仿真程序应用于控制机场油料库存,能够形成合理的库存控制策略。     

一类离散事件系统的优化控制与仿真

对一类确定性离散事件静态系统,本文在分析了影响最优控制指标的主要因索之后,根据局部优化与全局优化相结合的原则,提出了一种次优控制的有效方法,并进行了计算机仿真,且对其计算复杂性进行了分析。     

基于软分区的地区电网自动电压控制系统

介绍贵港地区电网基于软分区的三级自动电压控制（AVC）系统,并对该系统的三级控制原理及区域变电站的控制规则进行说明。     

计算机光路自动准直控制系统的控制问题研究与分析

计算机光路准直控制系统是一个复杂的实时控制系统，该系统控制问题研究是整个计算机控制系统的关键，文章对光路准直的控制过程及实现给出了详细描述。     

爬行机器人的分层可控混成Petri网建模研究

飞机表面爬行机器人是一个复杂的离散事件和连续动态事件相结合的混成运动系统,为描述系统的静态特性和动态行为,提出一种分层可控混成Petri网模型.依据爬行运动机构定义了Petri网模型组成元素,建立了爬行机器人单轴和双轴分层可控混成Petri网,该模型可接收上层运动轨迹指令并输出爬行动作序列.实验表明,基于该模型实施的飞...     

微机控制的谐波励磁发电机自动电压调节器

介绍了采用高性能16位单片机80C196控制的谐波励磁发电机自动电压调节器,运用先进的PWM、GTR控制技术及合理的控制算法实现其高精度、高可靠性、多功能控制。性能、功能价格比高。     

离散事件系统分布式仿真的集中并行控制

详细介绍了离散事件系统异步仿真中的一种保守的事件／时间管理策略。包括集中式并行控制机制的基本框架、一些概念、定律以及相应的并行算法,最后举例说明了集中式并行算法的控制流程。     

HAVC系统变电站多目标优化控制策略

变电站电压无功控制是电网混成自动电压控制(hybrid automatic voltage control,HAVC)系统的重要组成部分,其控制措施一般包括变电站有载调压变压器(OLTC)的调节和站内电容电抗器的投切等.变电站电压无功控制器设计是一个典型的多目标优化问题.即在调控过程中,既要控制无功及电压尽量接近设定值,又必须使OLTC的调节次数和电容电抗器的投切次数尽量少.因此,本文首先建立了HAVC系统变电站电压无功控制的多目标优化模型,然后求解该多目标优化问题得到变电站电压无功优化控制策略.对东北电网沙岭变电站的仿真分析证明了所提出的控制策略的有效性和正确性.     

基于Agent的离散事件仿真系统的控制功能框架研究

在研究基于Agent的离散事件仿真技术的基础上,提出了一个基于Agent的离散事件仿真系统的控制功能框架(ADESCF)。该框架包括了输入接口控制、输出接口控制、模型结构控制、仿真时钟控制、实验数据控制、仿真实验控制、仿真逻辑控制七个功能元素。分析了各种控制功能的工作原理与机制,并从输入输出连接关系角度分析了多Agent仿真系统层次化与分布式建模的本质,为该类仿真系统的开发提供了可参考的依据。     

Multi-level multi-area hybrid automatic voltage control system and its trial operation in Northeast China Grid

In order to coordinate automatic voltage control(AVC)systems of a large interconnected system,a multi-level multi-area hybrid automatic voltage control(MLMA-HAVC)system was constructed.This system began its trial operation in the Northeast China Grid in January 2010,and for the first time in China and abroad it realized automatic close-loop control of multi-area and multi-level interconnected power grid and multi-objective self-approaching optimization in aspects of security,high quality and economic operat...     

Hybrid control for wide-area power systems based on hybrid system theory

The article focuses on a new two-level hierarchical hybrid control which contains an upper layer discrete supervisory strategy and lower layer continuous decentralised coordinated control based on hybrid system theory for wide-area power system overall stability enhancement. The discrete supervisory strategies are constituted based on an information fusion technique by using wide-area measurements (WAMs) in order to supervise and switch the control actions into apposite operation mode following a large disturbance. The continuous control is designed in the form of a local state feedback decentralised controller for each generator helped by a coordinated controller, and the coordinated controller is proposed to apply the remote signals from the WAM systems for improving dynamic performance. However, unavoidable communication time delays are involved before the remote signals are received at the coordinated controller. Taking account of the multiply delays, the authors develop a delay-dependent H _∞ robust control technique based on multiple Lyapunov stability theory. Some new stability criteria for hybrid control are derived in terms of linear matrix inequality. The so-called hybrid control is demonstrated through simulation examples to achieve the best overall performance following a large disturbance.     

风–光互补发电系统的频率控制

由于风、光的强随机性和负荷的多变性,风-光互补发电系统的频率稳定性变差.有功功率优化既能够保证发电系统频率的安全与稳定,又能够使其经济地运行.但它是一个带约束的非线性多极值优化问题,用传统的方法很难处理.随着风-光互补发电场规模的增大,频率控制的实时性变差.针对这些问题,建立了以发电成本最小为目标的频率优化控制的数学模型,提出了基于均匀设计和惰性变异的粒子群算法和基于多Agent的协调优化方法,并用于发电系统频率的优化控制.实验验证了频率优化控制模型的正确性,显示了改进的粒子群算法比标准的粒子群算法优化效果更好;另一实验显示,多Agent的协调优化方法比单一种群的粒子群算法更加高效、更加适合于大规模风-光互补发电系统的频率控制.     

一类混杂系统的最优控制

研究了一类脉冲依赖于状态的混杂系统的最优控制问题.与传统的变分方法不同,通过将跳跃瞬间转化为一个新的待优化参数,得到了该混杂系统的必要最优性条件,从而将最优控制问题转化为一边界值问题,该边界值问题可由数值方法或解析方法解决.此外,利用广义微分的理论,将该必要最优性条件推广到Frechet微分形式.结论表明,在混杂动态系统运行的连续部分,最优解所满足的必要性条件和传统的连续系统相同.在混杂动态系统的脉冲点处,哈密尔顿函数满足连续性条件,协态变量则满足一定的跳跃条件.最后,通过两个实例分析,表明该方法是有效的.     

分布式电网多能互补电源输出电压自动开关控制方法

基于分层控制的输出电压自动开关控制方法与基于极值优化的输出电压自动开关控制方法没有对电网多能互补电源输出电压状态进行诊断,出现控制后无功功率、有功功率到达稳态时间长的问题,导致电源输出电压自动开关控制效果差,为此设计一种405分布式电网多能互补电源输出电压自动开关控制方法.对实时采集的电网输出电压数据进行简单的滑动平均...     

A multiple model approach for predictive control of nonlinear hybrid systems

This paper presents modeling and control of nonlinear hybrid systems using multiple linearized models. Each linearized model is a local representation of all locations of the hybrid system. These models are then combined using Bayes theorem to describe the nonlinear hybrid system. The multiple models, which consist of continuous as well as discrete variables, are used for synthesis of a model predictive control (MPC) law. The discrete-time equivalent of the model predicts the hybrid system behavior over the prediction horizon. The MPC formulation takes on a similar form as that used for control of a continuous variable system. Although implementation of the control law requires solution of an online mixed integer nonlinear program, the optimization problem has a fixed structure with certain computational advantages. We demonstrate performance and computational efficiency of the modeling and control scheme using simulations on a benchmark three-spherical tank system and a hydraulic process plant.     

基于AGC的光伏电站一次调频控制

逆变器调节速度快,且利用光伏电站的调频能力可降低常规调频备用容量,光伏电站深入参与电网一次调频将是一种很好的选择。基于此,本文在光伏电站自动发电控制（AGC）系统基础上增加光伏电站有功-频率下垂控制特性,使光伏电站在无需额外硬件增加或改造基础上实现AGC和一次调频功能一体化集成;其次,增加一次调频和AGC配合策略,实现二者无缝配合;最后,针对有功功率跟踪能力的不足对有功分配策略进行改进,提高了有功功率控制精度,提升了调频贡献能力。经过西北电网组织的新能源电站快速调频试验的验证,基于光伏电站自动发电控制系统的光伏电站一次调频控制具备较好的响应速度和调频贡献能力,能够为电网频率稳定提供支撑作用。     

Efficient mode enumeration of compositional hybrid systems

A hyperplane arrangement is a polyhedral cell complex where the relative position of each cell of the arrangement and the composing hyperplanes are summarised by a sign vector computable in polynomial time. This tool from computational geometry enables the development of a fast and efficient algorithm to translate the composition of discrete-time linear hybrid systems into an equivalent piecewise affine model and to determine if the composition is well posed. The tool also provides information on the real combinatorial degree of the system which can be used to reduce the size of the search tree and the computation time of the optimisation algorithms underlying optimal and model predictive control. Examples are presented illustrating the algorithm and showing its computational effectiveness.