一体化电力企业应用系统

综述了近年来IT技术发展对电力系统应用软件的影响；讨论了设计一体化电力企业应用系统需考虑的问题：如何实现互操作和信息的高度共享及提高应用系统的可靠性；提出了基于MAS的电力企业应用系统体系结构。     

Five Solar-Energy Desalination Systems

This paper gives an overview of the Solar Energy Storage Program at the Solar Energy Research Institute. The program provides research, systems analyses, and economic assessments of thermal and thermochemical energy storage and transport. Current activities include experimental research into very high temperature (above 800^°C) thermal energy storage and assessment of novel thermochemical energy storage and transport systems.

The applications for such high-temperature storage are thermochemical processes, solar thermal-electric power generation, regeneration of heat and electricity, industrial process heat, and thermally regenerative electrochemical systems.

The research results for five high-temperatuTe thermal energy storage technologies and two thermochemical systems are described.     

多联产系统的能值评估

为了扩展能值分析方法的应用范围,根据能值分析的基本思想,并以能量守恒和能值守恒为依据,提出了能反映多联产系统特点的能值评价指标,该能值评价指标将多联产系统的成本结构、排放影响和节约的资源置于同样重要位置考虑.以煤基燃料-电力多联产系统（甲醇-电力,氢-电力）为案例进行了能值分析.结果表明：该能值评价指标能全面度量多联产系统及其可持续性;多联产系统的连接模式、技术配置等因素均影响着多联产系统的可持续性;合适的燃料-电力比例的多联产系统的可持续性与单产系统相比有明显改善.图4表3参11     

Generic Singularities of Relay Systems

We discuss a class of nonsmooth vector fields on which are called relay systems. The main result provides a systematic classification of typical singularities which arise in generic one-parameter families of such systems. This is done by means of the notion of the mild equivalence between two relay systems. The theory is used to give a geometric characterization of the phase space in neighborhoods of the singularities, and tools of the singularity theory play a key role.      

采用OPC技术的控制系统数据融合

某电厂脱硫控制系统、DCS存在相互独立封闭的问题,为实现系统之间数据的交互,在人机界面层对整个脱硫系统进行融合,实现信息共享的目的.通过对各运行系统的数据融合、集中监控,能够展现整个锅炉运行系统的运行状况,为实现锅炉的高效运行提供实时可靠的数据信息,并为进一步提高电厂整体运行效率打下了良好的基础.     

关于两部制电价问题的研究

针对我国当前两部制电价的执行情况,重点研究了在我国电网实行商业化运营的情况下,上网电价和互供电价实行两部制电价的必要性及可行性,并提出了适合我国国情的两部制电价的改进思路和办法．     

The Lyapunov Spectrum of Blockdiagonal Semilinear Control Systems

For semilinear control systems the Lyapunov spectrum is approximated via the Floquet and the Morse spectrum. If the semilinear control system possesses singular subspaces, which corresponds to blockdiagonality of the system, it can be shown that the analysis of these two spectra can be reduced to these lower-dimensional systems. The Floquet spectrum of control sets with nonvoid interior is contained in the Floquet spectra of the restricted control systems. The Morse spectrum coincides with the union of the Morse spectra of the restricted systems. In particular, all Lyapunov exponents are attained on the singular subspaces.     

Practical Stability of Nonlinear Time-Varying Cascade Systems

In this paper, we investigate the practical stability problem of nonlinear time-varying cascade systems. We give some sufficient conditions that guarantee practical global uniform asymptotic stability and practical global uniform exponential stability of such dynamical systems.      

Robust Constrained Regulator Problem for Linear Uncertain Systems

The robust regulator problem for linear uncertain systems with constrained control is considered. Necessary and su.cient conditions of positive invariance of polyhedral domains with respect to motion of uncertain systems are given. Further, it is shown that in contrast to the case of perfectly known systems, positive invariance with respect to uncertain systems and stability of n - m assigned eigenvalues from the open loop system do not imply asymptotic stability. Furthermore, conditions ensuring this asymptotic stability are derived. This enables us to construct robust constrained regulators, i.e., control laws satisfying control constraints and achieving asymptotic stability in presence of parametric uncertainties.     

Time-Dependent Photovoltaic-Thermoelectric Hybrid Systems

Photovoltaic-thermoelectric hybrid systems that operate in steady state have attracted considerable attention due to the possibility of supplying more power output than the photovoltaic cell alone. In real life, however, the solar energy continually changes during a day, thus rendering the assumption of steady state unrealistic. In this study, we have investigated such time-dependent systems by following the trajectory of the sun between sunrise and sunset. Computed results of thermal efficiencies are parametrized in heat transfer coefficients, the thermal conductivities of the thermoelectric module, and Seebeck coefficients. For values of the Seebeck coefficient greater than 2.13 × 10^?3 V/K thermal efficiencies of the hybrid system appear higher than those of the photovoltaic cells alone. To tackle the strong nonlinear coupling between nodal temperatures, and power outputs, we have adopted two-stage iterative schemes.     

Global Stabilization for Systems Evolving on Manifolds

We show that any globally asymptotically controllable system on any smooth manifold can be globally stabilized by a state feedback. Since we allow discontinuous feedbacks, we interpret the solutions of our systems in the “sample and hold” sense introduced by Clarke, Ledyaev, Sontag, and Subbotin (CLSS). We generalize their theorem which is the special case of our result for systems on Euclidean space. We apply our result to the input-to-state stabilization of systems on manifolds with respect to actuator errors, under small observation noise. 2000 Mathematics Subject Classification. 93B05.     

Regular Trajectories of Young Systems

Journal of Dynamical and Control Systems - Monotonic structure of the space of trajectories of Young systems has been studied in a recent paper, Vieira et al. (J Dyn Control Syst...     

低温全新风系统的应用分析

简述了低温全新风系统的组成,分析了低温全新风系统在实际应用中的优势和不足,分析结果表明：与常温一次回风系统相比,低温全新风系统具有改善和稳定室内空气品质、避免病菌重复感染、保证空调系统安全性、节约风道材料、对于新风比大于等于30％的建筑可以节能、适合与冰蓄冷系统的联合应用等优点,具有过滤器易堵塞、滤料消耗多、运行管理任务繁重等缺点,低温全新风系统的应用利多弊少,应该扩大范围推广应用。     

Controllability of Right-Invariant Systems on Solvable Lie Groups

We study controllability of right-invariant control systems $\Gamma = A + \mathbb{R}B$ on Lie groups. Necessary and sufficient controllability conditions for Lie groups not coinciding with their derived subgroup are obtained in terms of the root decomposition corresponding to the adjoint operator ad B. As an application, right-invariant systems on metabelian groups and matrix groups, and bilinear systems are considered.     

Uniform Exponential Practical Stability of Impulsive Perturbed Systems

In this paper, we provide some sufficient conditions for the uniform exponential stability of perturbed impulsive systems by using the Lyapunov second method. Practical stability is also investigated for a class of perturbed impulsive systems.      

定流量系统与变流量系统的节能分析与比较

叙述了在冷水系统形式一次泵变流量系统中的同步变频比定流量系统及一变多工系统能更加充分地发挥变频泵的调节功能和节能效果以及运用Pipe Flow软件对此进行的模拟和理论验证。     

Topological and Invariance Entropy for Infinite-Dimensional Linear Systems

For linear (control) systems on infinite-dimensional state spaces with finite-dimensional unstable subspace, this paper introduces the concepts of topological entropy and invariance entropy. For linear dynamical systems on Banach spaces, described by a strongly continuous semigroup, the topological entropy is given by the sum of the real parts of the unstable eigenvalues of the infinitesimal generator. An application is provided by computing the topological entropy of delay equations and of a parabolic partial differential equation. Furthermore, the invariance entropy for infinite-dimensional linear control systems is equal to the topological entropy of the homogeneous equation and so it is also described by the eigenvalues of the infinitesimal generator.     

水文离散系统矩估计的E变换

研究了应用E变换与水文离散系统模型矩法的关系。示例证明,E变换可被用作为水文离散系统模型矩估计的一种有效方法。     

气电联合系统的协同规划方法及应用

鉴于传统规划方法分析单一能源系统存在的不足,提出了一种气电联合系统的协同规划方法,其考虑了天然气系统和电力系统的安全运行约束,以总投资成本、运行成本及碳排放成本最小为目标,建立了气电联合系统的协同规划模型,并采用改进的粒子群算法进行求解,最后对IEEE39节点系统和12节点天然气系统构建的算例进行分析。结果表明,与独立规划相比,气电联合系统协同规划所得规划方案总成本更低,碳排放量也更小。     

数字750 kV电网

数字化是电网发展的趋势,750kV电网在数字化方面已具雏形。文章综合考虑软件和硬件两方面,综述了750kV电网在科研、设计、施工、试验、运行维护等领域数字化的现状。在此基础上,展望了750kV电网在设备、科研、培训、管理等方面数字化的未来。