NTPS410 Exasmoc在线多变量，模型预测和优化控制器

内容

PART-A Exasmoc控制器简介

A1简介 ................................................. . ................................................. ........................... 1
A1.1 Exasmoc在线控制器定位........................................... .. .. ............................................ 2
A2 功能概述.......... .......................................... .............. .................................... .................. 4
A2.1控制器规格............................................. ............................ .................................. ........ 5
A2.2控制术语和功能............................................... .............................................................. 9
A2.3 Exasmoc控制器操作模式.................. ..... ................................................................... 15
A3 建模模块概述..................................... ........................................................................ 16
A3.1搭建Exasmoc控制器的基本流程图......................... ................................................. 19
A3.2控制器内部结构........................................................................................................ 24

A1 简介

本手册的这一部分简要介绍了Exasmoc多变量模型预测优化控制器如何在流程工业中的分布式控制系统（DCS）实现。

A1.1 Exasmoc在线控制器定位

工业过程控制通常具有三个等级级别，如下所述。

Fig. A 1.1 Hierarchy of control levels. 图A 1.1控制级别的层次

 第一级 - 基础监管控制（BRC）

该级别涵盖了在分布式控制系统（DCS）控制站中执行的PID，串级控制和比值控制等。操作员和工程师通过操作站访问这些控制器，以更改自动/手动，设定点和调整参数等。大多数过程控制应用的工厂需要BRC。

 第二级 - 增强型监管控制（ERC）。

该级别高于BRC，涵盖了过程中的一些复杂情况，诸如间隙控制，基于计算的控制，基于SEBOL程序功能块的控制等。ERC可能需要较少的功能控制块来满足特定的控制原理。尽管它是第二级，ERC方案的执行仍在DCS的控制站下。操作员和工程师可以通过操作站访问ERC控制方案。
一些COAST（本章中定义的控制应用标准）模块作为一些典型的过程单元的ERC，例如炉线圈平衡，浪涌控制等。

 第三级 – 先进过程控制（APC）

APC处理过程中最复杂的情况。它具有多变量，模型预测和优化功能。Exasmoc控制器提供了这些特征。
Exasmoc控制器在与DCS控制总线联网的专门设计的Windows基站下运行。本手册中这样的站被定义为Exasmoc站。操作员和工程师可以通过用于BRC / ERC的操作站或单独的Windows基站接口站与Exasmoc站访问Exasmoc。也可以使用Exasmoc监视器访问Exasmoc控制器。
以下部分将介绍Exasmoc控制器的基本系统配置。

 基本系统配置

如下图所示，Exasmoc站与DCS联网。用户的实际系统配置将基于基本配置。

Fig. A 1.2 Exasmoc position in DCS network 图1.2 DCS网络中Exasmoc的位置

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原文：

NTPS410 Exasmoc Online Multivariable, Model Predictive and Optimizing Controller

CONTENTS

PART- A Introduction of Exasmoc Controller

A1. Introduction .............................................................................................................................. 1
A1.1 Exasmoc online Controller position ..................................................................................... 2
A2. Functional Outline .................................................................................................................... 4
A2.1 Controller Specification ....................................................................................................... 5
A2.2 Control Terminology and Functionality................................................................................. 9
A2.3 Exasmoc Controller modes of operation ........................................................................... 15
A3. Overview of Building Blocks .............................................................................................. 16
A3.1 Basic Flow Diagram for building Exasmoc controller ....................................................... 19
A3.2 Controller Internal Structure .............................................................................................. 24

A1. Introduction

This section of the manual describes in general how Exasmoc multivariable model predictive optimizing controller is implemented for a process plant, along with Distributed Control System (DCS).

A1.1 Exasmoc online Controller position

Industrial process control in general has three hierarchical levels as described below.

 First Level - Basic Regulatory Control (BRC)

This level covers PID, Cascade Control and Ratio Control etc., which are executed in control stations of Distributed Control System (DCS). Operator and Engineers access these controllers through operator stations for changing Auto/Manual, Set Point, and Tuning Parameters etc. The entire plant in most of the process control application needs BRC.

 Second Level - Enhanced Regulatory Control (ERC).

This level is one level above BRC covers a bit complex situation in the process such as gap control, calculation based control, SEBOL program function block based control etc. ERC may need few function control blocks to address particular control philosophy. Even though it is second level the execution of the ERC scheme is still under the control station of a DCS. Operators and engineers can access ERC control schemes through operator station.
Some of the COAST (Control Application Standards defined in this chapter) modules work as an ERC for some typical process units such as Furnace coil balancing, Surge volume control etc.

 Third Level - Advanced Process Control (APC)

APC handles the most complex situation in the process. It has multivariable, model predictive and optimization features. Exasmoc controller provides these features.
Exasmoc controller runs under the specially designed Windows based station networked with DCS Control bus. Such station in this manual is defined as Exasmoc Station. Operators and Engineers can access the Exasmoc either through same operator station used for BRC/ERC OR separate Windows based station interfaced station’s with Exasmoc station. It is also possible to use Exasmoc monitor for accessing Exasmoc controller.
Following section will describe the basic system configuration for Exasmoc controller.

 Basic System configuration

Exasmoc Station is networked with DCS, which is shown in the following figure. User’s actual System configuration will be based on basic configuration.

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2017.3.19