基于区域并网的AGC和一次调频控制回路的改进

介绍了基于区域并网的发电厂自动发电控制(AGC)和一次调频回路的控制结构和控制方法的改进方案。合理设计控制区域的AGC控制逻辑,消除AGC指令短周期波动对机组运行稳定性的影响;设计能够兼顾机组运行安全性和经济性的综合控制方案,增加针对厂级机组负荷优化分配系统的考核指标。

兼顾阻尼特性与调频特性的水力发电机组控制策略研究

在电力系统负荷特点、水力发电系统固有的水-机-电耦合特性的共同作用下,水力发电系统正面临着日益复杂的运作工况与更为严格的电网考核挑战。为了持续追求更快的响应速度,往往会削弱系统的阻尼特性,进而引发低频振荡故障,对机组的安全稳定与调频成效构成严重威胁。本研究以源荷供需平衡的视角着手,把调速系统视为水力发电机组的核心控制系统,在MATLAB/Simulink平台上构建了电力系统稳定器与同步电机的物理模型,进而搭建了水力发电机组单机、并网模型,旨在深入研究一次调频的动态稳定性。

PARALLEL COMPUTATION OF 3-D HYPERSONIC FLOWS ON UNSTRUCTURED HYBRID MESHES

A parallel virtual machine （PVM） protocol based parallel computation of 3-D hypersonic flows with chemical non-equilibrium on hybrid meshes is presented. The numerical simulation for hypersonic flows with chemical non-equilibrium reactions encounters the stiffness problem, thus taking huge CPU time. Based on the domain decomposition method, a high efficient automatic domain decomposer for three-dimensional hybrid meshes is developed, and then implemented to the numerical simulation of hypersonic flows. Control equations are multicomponent N-S equations, and spatially discretized scheme is used by a cell-centered finite volume algorithm with a five-stage Runge-Kutta time step. The chemical kinetic model is a seven species model with weak ionization. A point-implicit method is used to solve the chemical source term. Numerical results on PC-Cluster are verified on a bi-ellipse model compared with references.