JPS60221802A - Multiplexing device for control - Google Patents

Abstract

PURPOSE:To execute the maintenance having a reliability in a state that a process remains moved by providing a means for calculating a difference to a mean value of an output one operating means and an output of other operating means, at every operating means, and for making an output of the operating means invalid, when an error has exceeded a prescribed value. CONSTITUTION:Each system control device 6a-6c of a turbo-generator detects a revolving speed, respectively, makes a current flow to control coils 31a-31c of an actuator 3 and controls a relief valve 2. On the other hand, in case when a fault has been generated in a part of the control device, for instance, 6c, the control device 6c outputs a controlled variable deviated from a mean value of a normal case. As a result, the control devices 6b, 6c operate so as to negate the movement of 6c in order to execute a control of a target. Comparing logical circuits 62a-62c in each control device compare the self-controlled variable with other controlled variable, and detaches the own control line when the self-controlled variable. Since no common part exists in the constitution, the maintenance having a reliability is executed in a state that a process remains moved.

Description

【発明の詳細な説明】 本発明は制御用多重化装置に関する。[Detailed description of the invention] The present invention relates to a control multiplexing device.

従来、高信頼性を要求される制御においては多重化が図
られ、３重系による多数決方式が一般的である。この場
合、３者の比較、出力の選択装置は、１つの装置によっ
て構成されていたため、その共通要素である比較選択論
理が故障した場合、システムダウンとなり信頼性に限界
があった。Conventionally, multiplexing has been attempted in control that requires high reliability, and a majority voting system using a triple system is common. In this case, since the three comparison and output selection devices were constituted by one device, if the comparison and selection logic, which is a common element thereof, failed, the system would go down and reliability would be limited.

また、共通要素の部分的な故障で、がならずしもシステ
ムダウンとならない場合においても、システムを動作状
態において保守することは出来ず、結局はプロセスを停
止させなければならない。Furthermore, even if a partial failure of a common element does not necessarily cause the system to go down, the system cannot be maintained in an operating state and the process must eventually be stopped.

このような問題は発電所、化学プラントなどのようにプ
ロセスを停止させることにより膨大な損失を被むるシス
テムにおいては大きな問題となっている。Such a problem is a major problem in systems such as power plants and chemical plants, which suffer huge losses due to process stoppages.

また動かしながら保守することを目的として。The purpose is to maintain it while moving it.

２重系を２セット備えた４重系方式がある。There is a quadruple system with two sets of duplex systems.

これは２重系内で両系の一致をとり、不一致の場合、他
セットに切換える方式で、この方式によれば、制御装置
が増加し、なおがっ、故障検出機能が故障した場合、切
換が不能となり、故障検出部の信頼性によってシステム
の信頼性が決まって・しまう問題がある。This is a system in which both systems are matched within a dual system, and if they do not match, the system is switched to another set. According to this system, if the number of control devices increases and the failure detection function fails, the system switches to another set. There is a problem in that the reliability of the system is determined by the reliability of the failure detection unit.

本発明は以上のような問題に鑑み、多重系を構成するに
当って、共通部をなくし、多重系構成要素自身に選択論
理を設け、各要素を独立化するととによって、解析を図
るものである。In view of the above-mentioned problems, the present invention aims at analysis by eliminating common parts when configuring a multiplex system, providing selection logic in the multiplex system components themselves, and making each element independent. be.

以下、実施例においてその手段を説明する。Hereinafter, the means will be explained in Examples.

第１図は、タービン発電機の回転数制御を例とした８重
系制御システムの構成である。FIG. 1 shows the configuration of an eight-fold system control system, taking as an example the rotation speed control of a turbine generator.

第１図において、１はボイラ、２は調圧弁、３は調整弁
制御アクチュエータ、４はタービン、５は発電機、６ａ
、、６ｂ、６ｃは制御装置である。In FIG. 1, 1 is a boiler, 2 is a pressure regulating valve, 3 is a regulating valve control actuator, 4 is a turbine, 5 is a generator, 6a
, 6b, 6c are control devices.

以上の構成において制御装置６ａ、６ｂ、６ｃは、発電
機の回転数を、トランス７を介して得られる発電機５の
周波数より検出し、設定された周波数となるようアクチ
ュエータ３を介し調圧弁２を制御し、タービン４への蒸
気の圧力を制御することにより周波数を一定に保つ。In the above configuration, the control devices 6a, 6b, and 6c detect the rotation speed of the generator from the frequency of the generator 5 obtained via the transformer 7, and control the pressure regulating valve 2 via the actuator 3 so that the frequency becomes the set frequency. The frequency is kept constant by controlling the steam pressure to the turbine 4.

ただし、本実施例は他の発電とは接続されておらないが
、一般には接続され、同期化現象により、引き込まれる
が、本発明の本質ではないので以下第１図の構成におい
て説明する。However, although this embodiment is not connected to other power generators, it is generally connected and drawn in due to the synchronization phenomenon, but this is not the essence of the present invention, so it will be explained below with reference to the configuration of FIG. 1.

以上の構成および制御において、各系制御装置６ａ＊　
６ｂｔ　６ｃはそれぞれ回転数を析出して、アクチュエ
ータ３の制御コイル３１ａ、３１ｂ。In the above configuration and control, each system control device 6a*
6bt and 6c respectively determine the rotation speed and are the control coils 31a and 31b of the actuator 3.

３１０に電流を流し、調圧弁２を制御する。310 to control the pressure regulating valve 2.

この場合アクチュエータ３はそれぞれの制御装置である
電流の和で動作し、その積分で調圧弁２が開閉するもの
と仮定する。その詳細に関しては。In this case, it is assumed that the actuator 3 is operated by the sum of the currents of the respective control devices, and the pressure regulating valve 2 is opened and closed by the integration of the currents. As for the details.

本発明の本質ではないので省略する。Since this is not the essence of the present invention, it will be omitted.

今仮に各制御装置ｉ６ａ、６ｂ、６ｃが正常であった場
合、各制御装置からの制御量は多少の差はあるが第２図
に示すように許容誤差内で一致し、その和すなわち約３
倍の制御量としてアクチュエータ３ｔｔ作動させる。Now, if each control device i6a, 6b, 6c were normal, the control amounts from each control device would match within the tolerance as shown in Figure 2, although there would be some differences, and the sum of the amounts would be approximately 3.
Actuator 3tt is operated to double the control amount.

一方、制御装置の一部たとえば６ｃに故障が発生した場
合、制御装置６ｃは正常な場合の平均値からはずれた制
御量を出力する。On the other hand, if a failure occurs in a part of the control device, for example 6c, the control device 6c outputs a control amount that deviates from the average value in a normal case.

その結果他の制御装置！６ａ、６ｂは目標とする制御を
行うため、６ｃの動きを打ち消すよう動作する。As a result other control devices! 6a and 6b operate to cancel the movement of 6c in order to perform targeted control.

この時、６ａ、６ｃの制御量は正常であれば許容誤差内
で一致し、又、正常、異常が２対１であるので６ａ、６
ｂが６０に打ち勝って正常な制御が続行される。At this time, if the control amounts of 6a and 6c are normal, they match within the allowable error, and since the ratio of normal and abnormal is 2:1, 6a and 6c
b overcomes 60 and normal control continues.

以上のような状態において、各制御装置内の比較選択論
理回路６２ａ、６２ｂ、６２ｃは、自己の制御量と、他
の制御量を比較し、自己の制御量のみが他より許容誤差
を越えて−た場合、自己の制御線を切り離す。In the above state, the comparison and selection logic circuits 62a, 62b, and 62c in each control device compare their own control amount with other control amounts, and determine whether only their own control amount exceeds the allowable error compared to the others. − If the control line is disconnected, the control line is disconnected.

一方他の正常な系６ａ、６ｂは互いに許容誤差内である
ので、自己を正常と見なし、切り離さず。On the other hand, since the other normal systems 6a and 6b are within tolerance, they are considered normal and are not separated.

以後正常な運転が続行される。Normal operation will continue from then on.

この場合、各県の故障判定に誤りがあった場合には、故
障系を切り離せなくなる可能性があるので、他の異常を
発見した場合、その旨を報知することで操作員等によっ
て切離しを図る。異常系番二関しても同様、故障を発見
した場合は報知し、保守を行う。In this case, if there is an error in the failure judgment of each prefecture, there is a possibility that the faulty system cannot be isolated, so if another abnormality is discovered, the operator etc. can attempt to isolate it by notifying that fact. . Similarly, if a failure is discovered regarding abnormal system number 2, it will be notified and maintenance will be performed.

以上のような構成とした場合、共通な部分がないので、
プロセスを動かしたままで保守を示すことができる。With the above configuration, there are no common parts, so
Maintenance can be demonstrated while the process is still running.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図〜第８図は本発明の説明図である。 ％ｒ　図 1 to 8 are explanatory diagrams of the present invention. %r figure

Claims (1)

【特許請求の範囲】[Claims] 検出された被制御物の状態量と所定の目標状態量との差
より、制御量を算出する少なくとも３個以上の演算手段
と、上記各演算手段の出力を加算し、その加算値にもと
づき被制御物を制御する制御手段とからなる多重化装置
において、さらに、各演算手段ごとに、その演算手段の
出力と残りの他の演算手段の出力の平均値との差を算出
し、誤差が所定値をこえたとき、その演算手段の出力を
無効にする手段を設けたことを特徴とする制御用多重化
装置。Based on the difference between the detected state quantity of the controlled object and a predetermined target state quantity, at least three calculation means for calculating the control amount and the outputs of each of the above calculation means are added, and the output of the above-mentioned calculation means is calculated based on the added value. In a multiplexing device consisting of a control means for controlling a controlled object, for each calculation means, the difference between the output of that calculation means and the average value of the outputs of the remaining calculation means is calculated, and the error is determined to be within a predetermined value. 1. A control multiplexing device, comprising means for invalidating the output of the calculation means when the value exceeds the value.