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电站仿真机逻辑保护及控制系统软件的开发
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摘要
随着控制系统和计算机技术的发展,我国电力工业的自动化水平有了显著提高。集散式控制系统(Distributed Control System,简称DCS)在电厂的运行控制中得到广泛应用,与之相适应,出现了基于DCS系统的全CRT仿真机。随着仿真机类型的变化,必然会导致仿真机开发工具的开发和改进。
    以贵州习水电厂135MW机组仿真机的开发为实例,本文建立了以电气系统为对象的动态数学模型,开发了一个基于DCS电站仿真机的控制组态软件,并应用该组态软件设计了对象机组的逻辑保护(包括电气逻辑)及控制部分的仿真软件。
    该软件以FOXBORO DCS为主要参照对象,有别于传统的仿真机,它将整个系统的逻辑及控制与模型本身分离开来,并开发了组态系统提供给用户进行组态。其逻辑保护和控制部分的组态在操作站管理系统进行,不用加入模型,也不用生成控制源代码,因此很自然的就实现了在线调整、实时控制等类同于实际现场的模式。在本课题中,控制、逻辑保护和电气逻辑仿真软件主要包含热工控制中一些常用的代数和逻辑运算。它以FOXBORO的DCS控制系统为主要参考模式,采用填表的方式进行控制组态,用户只需定义I/O条件、填写具体的运算变量名、逻辑变量名即可。本软件为建模人员提供了一个友好的用户界面,使建模人员在建模时不必对模块内部的控制、逻辑程序有很深的了解就可以方便的对其进行编写和修改,实时改变各逻辑和控制变量在数据库里的值,参与运行和调试,从而实现对机组的控制。因此,本组态软件提供的这样一个平台,让控制工程师能集中精力于控制回路及逻辑保护(包含电气逻辑)的构成,而不必拘泥于一些具体而烦琐的程序操作。
    本文对传统仿真机作出的改进,使其不仅仅可以提供给操作人员进行仿真培训,还可以供热工工程师进行一些热工控制的组态构建和进行控制管理人员的培训。其控制组态的模式和现场模式保持了一致,不必在实际的DCS控制室进行试验,减少了投资,达到了仿真的目的。
With the devlopment of Control System and Computer Technology,domestic automatization level of electric power industry improve notably. Distributed Control System for short DCS is adopted widely in runing and controlling of power station,so Completeness CRT Simulator basely on DCS System emerge consequentially.With the change of Simulator's style, exploitable tool of Simulator must to be empoldered and improved.
    The GuiZhou XiShui Power Station's 135MW Set are regareded as a example,the paper sets up a electric system's dynamic maths model,exploits a control configuration software basely on DCS power station simulator,and designs a software of simulator's logic protect(include Electric logic) and control.
    The FOXBORO DCS is regarded as main reference object,it doesn't same as the traditional simulator.The logic protect and control are separated from model and the configuration control system be exploited in the paper.And the configuration of logic protect and control is operatised at Operation Station Administration System,not to be added into Model,not to build control sound code also. Therefore it comes true the on-line adjusting, real-time control and so on.It sames as real locale.The software of logic protect(include Electric logic) and control includes some usual algebraic and operation model of thermal control and logic operation of logic protect.It adopts FOXBORO's DCS as a example,so we configuration via filling table,user only define I/O condition,fill certain operation variable,and name logic variable.The software offers a friendly user's interface, personnel can compile and modify the control and logic program, change the value of logic and control variable conveniently, attach themselves to run,debug and control the set,not need to know about the inside of the old programs deeply.So the configuration software offer a flat that control engineer can attend to the structure of control loop and logic protect(include Electric logic),not but to handle complicated program.
    The software improves on the traditional simulator,it is offered not only to operator for simulation training,but also to engineer for designing control configuration and training the control manager The pattern of control configuration accord with the reality ,not need to test in the actual DCS, reduce the investment,reach the simulative goal.
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