JP2002097904A - Turbine controlling device - Google Patents

Turbine controlling device

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Publication number
JP2002097904A
JP2002097904A JP2000288164A JP2000288164A JP2002097904A JP 2002097904 A JP2002097904 A JP 2002097904A JP 2000288164 A JP2000288164 A JP 2000288164A JP 2000288164 A JP2000288164 A JP 2000288164A JP 2002097904 A JP2002097904 A JP 2002097904A
Authority
JP
Japan
Prior art keywords
valve
opening
test
closing
command value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2000288164A
Other languages
Japanese (ja)
Other versions
JP3975457B2 (en
Inventor
Hiroyuki Takashima
博之 高島
Takashi Tomura
孝 戸村
Shintaro Tsuji
真太郎 辻
Takumi Kawai
巧 河合
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP2000288164A priority Critical patent/JP3975457B2/en
Publication of JP2002097904A publication Critical patent/JP2002097904A/en
Application granted granted Critical
Publication of JP3975457B2 publication Critical patent/JP3975457B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Control Of Turbines (AREA)

Abstract

PROBLEM TO BE SOLVED: To prevent the rapid opening and closing of a valve which is erroneously caused by the stick of the valve and the malfunction of an interlock mechanism (in particular, the lag of the time set to a timer) during a valve test. SOLUTION: A turbine controlling device having a function to control the rapid opening and closing of the valve and a function to perform valve tests includes a subtraction circuit which outputs the deviation of the actual opening degree (feed back signal) of the valve from the command value of valve opening degree using the command value of valve opening degree, which is a control signal for operating a plant, for the control of valve opening and closing without using a command value for a valve test in the valve test to prevent erroneous valve closing and opening which is possibly caused by the stick of the valve and the malfunction of the interlock mechanism during the valve test, a predefined value detecting circuit 101 which outputs a detected value provided that the deviation output of the actual opening degree of the valve from the command value of valve opening degree becomes the defined value, and a logic circuit 40 which outputs signals for controlling the rapid opening and closing of the valve only when it is necessary to protect the plant.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、タービン制御に係
り、特に、弁の急速な開,閉を制御する機能と弁の動作
テストである弁テストの機能を有するタービン制御装置
に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to turbine control, and more particularly to a turbine control device having a function of controlling rapid opening and closing of a valve and a function of a valve test which is an operation test of the valve.

【0002】[0002]

【従来の技術】図2に、本発明の利用分野である原子力
発電所のタービン制御の概略図を示す。原子炉で発生し
た蒸気は、蒸気加減弁(CV)から高圧タービン、組合
わせ蒸気止弁(IV/ISV)、低圧タービンを経由
し、復水器へ流れるか、あるいは、タービンバイパス弁
(TBV)を経由し、復水器へ流れる。組合わせ蒸気止
弁(IV/ISV)とタービンバイパス弁(TBV)の
動作を説明する。組合わせ蒸気止弁(IV/ISV)
は、高圧タービンと低圧タービンの間にあり、タービン
ケーシングに近い位置に設置されている。タービン負荷
が急速に低下した場合は、弁は急速に閉動作し、低圧タ
ービンへの蒸気の流入を急速に止め、タービンの過速を
防止する機能をもつ。しかし、従来の技術では、弁テス
ト中に、弁のスティック、インターロックの誤動作(特
に、タイマー設定時間のズレ)により、タイマーで設定
している弁テスト時間を実際の弁テスト時間が超過した
場合に、弁テスト指令値と弁の実開度(フィードバック
信号)の偏差が既定値となることによって誤った弁の急
閉,急開が起こりうる。
2. Description of the Related Art FIG. 2 is a schematic diagram showing turbine control of a nuclear power plant, which is a field of application of the present invention. Steam generated in the reactor flows from a steam control valve (CV) to a condenser via a high-pressure turbine, a combined steam stop valve (IV / ISV), a low-pressure turbine, or a turbine bypass valve (TBV). Flows through to the condenser. The operation of the combined steam stop valve (IV / ISV) and the turbine bypass valve (TBV) will be described. Combination steam stop valve (IV / ISV)
Is located between the high and low pressure turbines and close to the turbine casing. When the turbine load decreases rapidly, the valve closes quickly, has a function of rapidly stopping the flow of steam into the low-pressure turbine, and preventing the turbine from overspeeding. However, in the conventional technology, during the valve test, if the actual valve test time exceeds the valve test time set by the timer due to a malfunction of the valve stick or interlock (particularly, a deviation of the timer setting time). If the deviation between the valve test command value and the actual opening of the valve (feedback signal) becomes a predetermined value, erroneous sudden closing and sudden opening of the valve may occur.

【0003】図3を用いて、従来の技術による、組合わ
せ蒸気止弁(IV/ISV)の急速な閉動作の制御方式
と弁テスト時の動作について説明する。通常運転時は、
プラント運転用の制御信号である弁開度指令が信号切替
器1によって選択され、弁開度指令と弁開度検出器によ
りフィードバックされる弁の実開度9の偏差に従ってサ
ーボ弁が動作し、当該弁を制御する。弁テストは、弁テ
スト信号により起動する。弁テスト信号が信号切替器1
に入力され、弁テスト指令が選択されると、サーボ弁は
弁テスト指令により当該弁を駆動する。組合わせ蒸気止
弁(IV/ISV)の急速な閉動作の制御方式は、論理
回路4から以下に示す条件1と条件2の論理積を組合わ
せ蒸気止弁(IV/ISV)の急速な閉動作の指令信号
8として出力し、この指令信号8により、緊急時と判断
し、通常運転に用いるサーボ弁に比べて極めて迅速に弁
を急閉できる操作端である電磁急閉弁を動作させ、当該
弁を急速に閉し、タービンの過速を防止している。 −条件1− 『条件1』が成立するのは、以下の2ケースである(ケ
ースにより異なる)。 ・ケース1:弁テスト中の場合 弁テスト指令値−弁の実開度(フィードバック信号)≦
既定値(例:−5%) ・ケース2:弁テスト中以外の場合 弁開度指令値−弁の実開度(フィードバック信号)≦既
定値(例:−5%) 以上の論理により、当該弁の急速な閉動作を制御する指
令信号の条件である『条件1』が成立する。 −条件2− 『条件2』が成立するのは、弁テスト中以外かつ系統動
揺時等の負荷の変動により弁を不所望に急閉しない為の
条件10(この条件10は特公平3−70088号公報
に説明されている。)(本回路の動作除外条件)が成立
していない場合(プラントにとって当該回路の保護が必
要な場合に限り)に成立する。ここで、既定値の検出回
路5はタービン速度の既定値を検出、出力し、論理回路
6は中間蒸気圧力と発電機電流の論理によりPLU(パ
ワー ロード アンバランス)信号を出力する。なお、
弁テスト中は、弁テスト信号をタイマー2に入力し、N
OT回路7を介してタイマー動作時間(一定時間)だけ
論理回路4は既定値の検出回路3の信号を除外(インタ
ーロック)し、テスト中の弁の急閉動作を防止してい
る。しかし、弁テスト中は、電磁急閉弁、サーボ弁とも
に弁テスト指令値により動作するため、仮に、弁のステ
ィックが続き、タイマー2の設定時間を実際の弁テスト
時間が超過すれば、“弁テスト指令値−弁の実開度(フ
ィードバック信号)≦既定値(例:−5%以下)”が成
立し、プラント保護の項目以外(弁テスト中の弁スティ
ック)で弁をトリップ(急閉)動作させる結果となる。
Referring to FIG. 3, a description will be given of a control method of a rapid closing operation of a combined steam stop valve (IV / ISV) and an operation at the time of a valve test according to the prior art. During normal operation,
A valve opening command, which is a control signal for plant operation, is selected by the signal switch 1, and the servo valve operates according to the deviation between the valve opening command and the actual opening 9 of the valve fed back by the valve opening detector, Control the valve. The valve test is activated by a valve test signal. Valve test signal is signal switch 1
When a valve test command is selected, the servo valve drives the valve according to the valve test command. The control method of the rapid closing operation of the combination steam stop valve (IV / ISV) is as follows. The logic circuit 4 combines the logical product of the following conditions 1 and 2 to rapidly close the steam stop valve (IV / ISV). It is output as a command signal 8 of the operation, and by this command signal 8, it is determined that an emergency has occurred. The valve is closed rapidly to prevent turbine overspeed. -Condition 1-"Condition 1" is satisfied in the following two cases (different depending on the case).・ Case 1: During valve test Valve test command value-actual valve opening (feedback signal) ≤
Default value (Example: -5%)-Case 2: Other than during valve test Valve opening command value-Actual valve opening (feedback signal) ≤ Default value (Example: -5%) “Condition 1”, which is the condition of the command signal for controlling the rapid closing operation of the valve, is satisfied. -Condition 2-"Condition 2" is satisfied only when the valve is not tested and when the system does not suddenly close the valve undesirably due to load fluctuations such as when the system is shaken. This is true when the condition for excluding the operation of the circuit is not satisfied (only when the plant needs to protect the circuit). Here, the default value detection circuit 5 detects and outputs a default value of the turbine speed, and the logic circuit 6 outputs a PLU (power load unbalance) signal based on the logic of the intermediate steam pressure and the generator current. In addition,
During the valve test, a valve test signal is input to timer 2 and N
The logic circuit 4 excludes (interlocks) the signal of the detection circuit 3 of a predetermined value through the OT circuit 7 for a timer operation time (constant time), thereby preventing a rapid closing operation of the valve under test. However, during the valve test, since both the electromagnetic quick closing valve and the servo valve operate according to the valve test command value, if the stick of the valve continues and the actual valve test time exceeds the set time of the timer 2, the valve Test command value-actual valve opening (feedback signal) ≤ default value (eg, -5% or less) "holds, and trips (rapidly closes) the valve with items other than plant protection items (valve stick during valve test) The result is that it works.

【0004】タービンバイパス弁(TBV)は、原子炉
と復水器の間にあり、タービン負荷が急速に低下する
と、弁は急速に開動作する。通常運転中にタービンを経
由し、復水器へ流れていた蒸気は、原子炉からタービン
バイパス弁(TBV)を経由し、復水器に直接に流れ
る。これにより、原子炉の圧力上昇を抑制する機能をも
つ。タービンバイパス弁(TBV)の弁テストと弁の急
開動作の方法は、組合わせ蒸気止弁(IV/ISV)の
方式と開閉方向が逆であるが、他は同一であり、タービ
ンバイパス弁(TBV)も、弁テスト中にプラント保護
の項目以外で弁をトリップ(急開)動作させる可能性が
ある。
[0004] A turbine bypass valve (TBV) is located between the reactor and the condenser, and when the turbine load drops rapidly, the valve opens rapidly. During normal operation, the steam flowing to the condenser via the turbine flows directly from the reactor via the turbine bypass valve (TBV) to the condenser. Thereby, it has a function of suppressing a rise in pressure of the reactor. The method of the valve test of the turbine bypass valve (TBV) and the rapid opening operation of the valve are the same as those of the combined steam stop valve (IV / ISV) in the opening / closing direction, but are otherwise the same. TBV) may also trip (suddenly open) the valve during the valve test except for the item of plant protection.

【0005】[0005]

【発明が解決しようとする課題】従来の方式の図3にお
いて、組合わせ蒸気止弁(IV/ISV)の弁テスト中
は、弁テスト信号をタイマー2に入力し、タイマー動作
時間だけ論理回路4で一定時間は既定値の検出3の信号
を除外し、テスト中の弁の急閉動作を防止している。し
かし、弁テスト中の弁は、弁テスト指令値により動作す
るため、仮に、弁のスティックが続けば、“弁テスト指
令値−弁の実開度(フィードバック信号)≦既定値
(例:−5%以下)”が成立し、プラント保護の項目以
外で弁をトリップ(急閉)動作させる結果となる。この
結果、タービンへ流入する蒸気は遮断され、出力を必要
時以外で絞り込む結果となる。さらに、原子炉より発生
する蒸気が過渡的(タービンバイパス弁(TBV)によ
る圧力制御により蒸気を復水器へ逃がすまで)に行き場
を失うことから、原子力発電所において特に重要な原子
炉に対しても、外乱を加えることとなり、原子炉圧力変
動(上昇)することから、原子炉スクラムする可能性も
ある。同様に、タービンバイパス弁(TBV)では、1
00%負荷時(通常運転中)の弁テストで弁が一定時間
スティックし、誤って急開するようなことがあれば、タ
ービンへの流入する蒸気が減り、出力が低下するばかり
でなく、蒸気圧力も低下することから、かわき蒸気が湿
り蒸気となり、タービンにダメージを与えることとな
る。さらには、原子炉に対しても、外乱を加えることと
なり、原子炉圧力変動(下降)することから、原子炉ス
クラムする可能性もある。
In the conventional system shown in FIG. 3, during the valve test of the combined steam stop valve (IV / ISV), a valve test signal is input to the timer 2 and the logic circuit 4 is operated for the timer operation time. For a certain period of time, the signal of the detection 3 which is a predetermined value is excluded, thereby preventing a sudden closing operation of the valve during the test. However, the valve during the valve test operates according to the valve test command value. Therefore, if the stick of the valve is continued, “valve test command value−actual valve opening (feedback signal) ≦ predetermined value (eg, −5) % Or less) ”, and the valve is tripped (suddenly closed) except for the item of plant protection. As a result, the steam flowing into the turbine is shut off, and the output is reduced when it is not necessary. Furthermore, since the steam generated from the reactor loses its place transiently (until the steam is released to the condenser by the pressure control by the turbine bypass valve (TBV)), the reactor is particularly important in a nuclear power plant. In addition, since a disturbance is applied and the reactor pressure fluctuates (increases), there is a possibility that the reactor scrams. Similarly, in the turbine bypass valve (TBV), 1
If the valve sticks for a certain period of time during a valve test at a load of 00% (during normal operation) and accidentally opens suddenly, the steam flowing into the turbine will decrease and the output will decrease. Since the pressure is also reduced, the dry steam becomes wet steam and damages the turbine. Further, a disturbance is applied to the reactor, and the reactor pressure fluctuates (falls down).

【0006】本発明の課題は、弁テスト中に、弁のステ
ィック、インターロックの誤動作(特に、タイマー設定
時間のズレ)により誤って起こりうる弁の急閉,急開を
防止することにある。
SUMMARY OF THE INVENTION An object of the present invention is to prevent sudden closing and sudden opening of a valve, which may occur erroneously due to malfunction of a stick or interlock of a valve (particularly, deviation of a timer set time) during a valve test.

【0007】[0007]

【課題を解決するための手段】上記課題を解決するため
に、弁テスト中に、弁のスティック、インターロックの
誤動作(特に、タイマー設定時間のズレ)により、タイ
マーで設定している弁テスト時間を実際の弁テスト時間
が超過した場合に、弁テスト指令値と弁の実開度(フィ
ードバック信号)の偏差が既定値となることによって起
こりうる誤った弁の急閉,急開の防止を目的に、弁テス
ト中においても弁急閉,急開の制御に、弁テスト指令値
を用いずに、プラント運転用の制御信号である弁開度指
令値を用い、弁開度指令値と弁の実開度(フィードバッ
ク信号)の偏差が既定値となったことを条件に、プラン
トにとって当該保護が必要な場合に限り、当該弁の急速
な開閉を制御する。
In order to solve the above-mentioned problems, a valve test time set by a timer is set during a valve test due to a malfunction of a valve stick or an interlock (particularly, a deviation of a timer set time). The purpose of this is to prevent the sudden opening and closing of an erroneous valve that can occur when the deviation between the valve test command value and the actual valve opening (feedback signal) becomes the default value when the actual valve test time is exceeded. Also, during the valve test, the valve opening command value, which is a control signal for plant operation, is used for controlling the valve sudden closing and opening without using the valve test command value. Under the condition that the deviation of the actual opening (feedback signal) becomes a predetermined value, rapid opening and closing of the valve is controlled only when the protection is necessary for the plant.

【0008】[0008]

【発明の実施の形態】以下、本発明の実施形態を図面を
用いて説明する。図1は、本発明のタービン制御装置の
一実施形態であり、組合わせ蒸気止弁(IV/ISV)
の急速な閉動作の制御方式を示す。図1は、図3の従来
方式と比較すると、弁の急閉の誤動作を防止するインタ
ーロックに弁テスト中の弁の急閉を防止するインターロ
ックがない。特に、図3におけるタイマー設定がないた
め、弁テスト時間の延長による弁の誤った急閉動作を防
止できるといえる。以降に、その詳細を説明する。弁が
スティックした時、あるいは、一時的に弁がスティック
したことを想定すると、弁テスト時間が延長することが
あり得る。従来方式の図3において、タイマー設定時間
に対して弁テスト時間が超過した場合にも、タイマー2
は、タイマー設定時間にはテスト完了を想定した出力と
なる。また、弁テスト指令値と弁開度検出によりフィー
ドバックされる弁の実開度の偏差はマイナス方向に進行
することから、既定値の検出回路3が動作し、弁は誤っ
て急速に閉動作する。具体的に例を挙げれば、仮に、弁
テスト時間が10秒、既定値が−5%以下で弁急閉動作
をセットしている状態において、一時的な弁ステッィク
により、弁テスト時間が15秒に延び、その間に−10
%偏差を検出すれば、弁テスト中に組合わせ蒸気止弁
(IV/ISV)は急閉し、トリップとなる可能性があ
る。これに対し、本実施形態は、弁テスト中においても
弁急閉,急開の制御に、弁テスト指令値を用いずに、プ
ラント運転用の制御信号である弁開度指令値を用い、プ
ラント運転用の制御信号である弁開度指令値と弁の実開
度(フィードバック信号)の偏差が既定値となることに
よって、プラントにとって当該回路での保護が必要な場
合に限り、当該弁の急速な開閉を制御する弁の制御方法
である。
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a turbine control device according to the present invention, which is a combined steam stop valve (IV / ISV).
3 shows a control method of the rapid closing operation of the present invention. FIG. 1 is different from the conventional system of FIG. 3 in that the interlock for preventing the malfunction of sudden closing of the valve does not include the interlock for preventing sudden closing of the valve during the valve test. In particular, since there is no timer setting in FIG. 3, it can be said that an erroneous sudden closing operation of the valve due to extension of the valve test time can be prevented. Hereinafter, the details will be described. The valve test time can be extended when the valve sticks, or assuming that the valve sticks temporarily. In FIG. 3 of the conventional method, when the valve test time exceeds the timer set time, the timer 2
Is output assuming that the test is completed during the timer setting time. Further, since the deviation between the valve test command value and the actual opening of the valve, which is fed back by the detection of the opening of the valve, proceeds in the minus direction, the detection circuit 3 of the default value operates, and the valve erroneously closes rapidly. . Specifically, for example, if the valve test time is 10 seconds, the default value is -5% or less, and the valve rapid closing operation is set, the valve test time is 15 seconds due to the temporary valve stick. To -10
If a% deviation is detected, the combined steam stop valve (IV / ISV) may suddenly close during the valve test and trip. On the other hand, the present embodiment uses a valve opening command value, which is a control signal for plant operation, instead of using a valve test command value to control rapid valve closing and opening during a valve test. The deviation between the valve opening command value, which is a control signal for operation, and the actual valve opening (feedback signal) becomes a predetermined value. This is a method of controlling a valve for controlling the opening and closing of the valve.

【0009】図1において、組合わせ蒸気止弁(IV/
ISV)の弁テストは、弁テスト信号により起動する。
弁テスト信号が信号切替器1に入力されると、弁テスト
指令が選択され、サーボ弁は弁テスト指令と弁の実開度
(フィードバック信号)の偏差により当該弁を駆動す
る。組合わせ蒸気止弁(IV/ISV)の急速な閉動作
の制御方式は、論理回路40から以降に示す動作条件1
と動作条件2の論理積を組合わせ蒸気止弁(IV/IS
V)の急速な閉動作の指令信号80として出力し、この
指令信号80により、緊急時と判断し、通常運転に用い
るサーボ弁に比べて極めて迅速に弁を急閉できる操作端
である電磁急閉弁を動作させ、当該弁を急速に閉し、タ
ービンの過速を防止する。動作条件1、動作条件2につ
いて示す。 −動作条件1− 『動作条件1』は、弁開度指令値−弁の実開度(フィー
ドバック信号)≦既定値(例:−5%)で成立する。こ
こで、動作条件1は、弁テスト中も、既定値の検出回路
101でプラント運転用の制御信号である弁開度指令値
と弁の実開度(フィードバック信号)の偏差を検出す
る。既定値の検出回路101は動作条件1を出力する。
そのため、電磁急閉弁の動作条件である動作条件1は、
プラントにとっての緊急時(プラント運転用の制御信号
である弁開度指令値と弁の実開度(フィードバック信
号)の偏差が既定値)とならない限り動作しない。図3
の方式と比較する為に、具体的な例を挙げれば、仮に、
弁テスト時間が10秒、既定値が−5%以下で弁急閉動
作をセットしている状態において、一時的な弁ステッィ
クにより、弁テスト時間が15秒に延長した場合でも、
通常運転中のプラント運転用の制御信号である弁開度指
令値は100%全開にあることから、弁テスト指令によ
り閉している間に弁がスティックすることに関係なく、
弁テスト中の偏差はプラスの値であり、動作条件1は成
立しないので、弁テスト中に弁スティックによる当該弁
の急閉動作はしない。なお、図3の弁テスト中に、弁テ
スト信号をタイマー2に入力し、タイマー動作時間だけ
論理回路4で一定時間は既定値の検出回路3の信号を除
外(インターロック)し、テスト中の弁の急閉動作を防
止する手段(タイマー2、論理回路4が有するインター
ロック回路)は、動作条件1の成立条件から不要とな
る。 −動作条件2− 『動作条件2』は、系統動揺時等の負荷の変動により弁
を不所望に急閉しない為の条件10(この条件10は特
公平3−70088号公報に説明されている。)(本回
路の動作除外条件)が成立していない場合(プラントに
とって当該回路の保護が必要な場合に限り)に成立す
る。
In FIG. 1, a combination steam stop valve (IV /
The ISV valve test is activated by a valve test signal.
When a valve test signal is input to the signal switch 1, a valve test command is selected, and the servo valve drives the valve based on a deviation between the valve test command and the actual opening (feedback signal) of the valve. The control method of the rapid closing operation of the combination steam stop valve (IV / ISV) is as follows.
And the logical product of operating condition 2 and the steam stop valve (IV / IS
V) is output as a command signal 80 for a rapid closing operation. Based on this command signal 80, it is determined that an emergency has occurred, and an electromagnetic emergency stop, which is an operating end capable of rapidly closing the valve very quickly as compared with a servo valve used for normal operation. Activate the closing valve to quickly close the valve to prevent turbine overspeed. The operating condition 1 and the operating condition 2 will be described. -Operating condition 1- "Operating condition 1" is satisfied by a valve opening command value-actual valve opening (feedback signal) ≤predetermined value (eg, -5%). Here, under the operating condition 1, even during the valve test, the detection circuit 101 of a predetermined value detects a deviation between a valve opening command value, which is a control signal for plant operation, and an actual valve opening (feedback signal). The default detection circuit 101 outputs the operating condition 1.
Therefore, the operating condition 1, which is the operating condition of the electromagnetic quick closing valve, is:
It does not operate unless an emergency occurs for the plant (the deviation between the valve opening command value, which is a control signal for plant operation, and the actual valve opening (feedback signal) is a predetermined value). FIG.
To give a concrete example to compare with the method of
When the valve test time is 10 seconds, the default value is -5% or less, and the valve rapid closing operation is set, even if the valve test time is extended to 15 seconds by a temporary valve stake,
Since the valve opening command value, which is a control signal for plant operation during normal operation, is 100% fully open, regardless of whether the valve sticks while the valve is closed by the valve test command,
Since the deviation during the valve test is a positive value and the operating condition 1 is not satisfied, the valve stick does not rapidly close the valve during the valve test. During the valve test shown in FIG. 3, a valve test signal is input to the timer 2, and the logic circuit 4 removes (interlocks) the signal of the detection circuit 3 having a predetermined value for a certain period of time during the timer operation. Means for preventing the valve from suddenly closing (interlock circuit included in the timer 2 and the logic circuit 4) become unnecessary because the condition 1 is satisfied. -Operating condition 2-"Operating condition 2" is a condition 10 for preventing the valve from being undesirably suddenly closed due to a load fluctuation at the time of system fluctuation (this condition 10 is described in Japanese Patent Publication No. 3-70088). .) (Operation exclusion condition of this circuit) is not satisfied (only when the protection of the circuit is necessary for the plant).

【0010】タービンバイパス弁(TBV)の弁の急開
動作の方法は、組合わせ蒸気止弁(IV/ISV)の方
式と開閉方向が逆であため、既定値の設定が異なる他は
同一である。図4を用いて、以降に説明する。タービン
バイパス弁(TBV)の弁テストは、弁テスト信号によ
り起動する。弁テスト信号が信号切替器1に入力される
と、弁テスト指令が選択され、サーボ弁は弁テスト指令
と弁の実開度(フィードバック信号)の偏差により当該
弁を駆動する。タービンバイパス弁(TBV)の急速な
開動作の制御方式は、論理回路40から以降に示す動作
条件3と動作条件4の論理積をタービンバイパス弁(T
BV)の急速な開動作の指令信号80として出力し、こ
の指令信号80により、緊急時と判断し、通常運転に用
いるサーボ弁に比べて極めて迅速に弁を急開できる操作
端である電磁急開弁を動作させ、当該弁を急速に開する
ことによってタービンへ流入していた蒸気を復水器へ流
し、原子炉の圧力上昇を抑制する。動作条件3、動作条
件4について以降に示す。 −動作条件3− 『動作条件3』は、弁開度指令値−弁の実開度(フィー
ドバック信号)≧既定値(例:20%)で成立する。 −動作条件4− 『動作条件4』は、系統動揺時等の負荷の変動により弁
を不所望に急開しない為の条件10(この条件10は特
公平3−70088号公報に説明されている。)(本回
路の動作除外条件)が成立していない場合(プラントに
とって当該回路の保護が必要な場合に限り)に成立す
る。タービンバイパス弁(TBV)は通常運転中の全閉
であり、プラント運転用の制御信号である弁開度指令値
は0%全閉にあることから、弁テスト指令により開して
いる間に弁がスティックすることに関係なく、弁テスト
中の偏差はマイナスの値であるり、動作条件3は成立し
ないので、弁テスト中に弁スティックによる当該弁の急
開動作はしない。
The method of rapidly opening the valve of the turbine bypass valve (TBV) is the same as that of the combined steam stop valve (IV / ISV) since the opening and closing direction is opposite to that of the combined steam stop valve (IV / ISV) except that the setting of the default value is different. is there. This will be described below with reference to FIG. Valve testing of the turbine bypass valve (TBV) is triggered by a valve test signal. When a valve test signal is input to the signal switch 1, a valve test command is selected, and the servo valve drives the valve based on a deviation between the valve test command and the actual opening (feedback signal) of the valve. The control method of the rapid opening operation of the turbine bypass valve (TBV) is based on the logical product of the operating condition 3 and the operating condition 4 shown below from the logic circuit 40.
BV) is output as a command signal 80 for the rapid opening operation. Based on this command signal 80, it is determined that an emergency has occurred, and an electromagnetic emergency stop, which is an operating end capable of rapidly opening the valve very quickly compared to a servo valve used for normal operation. By operating the valve opening and rapidly opening the valve, the steam flowing into the turbine flows to the condenser to suppress a rise in the pressure of the reactor. Operation condition 3 and operation condition 4 will be described below. -Operating condition 3-"Operating condition 3" is established by (valve opening command value-actual opening of valve (feedback signal) ≧ predetermined value (eg, 20%)). -Operating condition 4- "Operating condition 4" is a condition 10 for preventing the valve from suddenly opening undesirably due to a fluctuation in load at the time of system fluctuation or the like (this condition 10 is described in Japanese Patent Publication No. 3-70088). .) (Operation exclusion condition of this circuit) is not satisfied (only when the protection of the circuit is necessary for the plant). The turbine bypass valve (TBV) is fully closed during normal operation, and the valve opening command value, which is a control signal for plant operation, is 0% fully closed. Regardless of the sticking, the deviation during the valve test is a negative value or the operating condition 3 is not satisfied, so that the valve stick does not rapidly open the valve during the valve test.

【0011】[0011]

【発明の効果】以上説明したように、本発明によれば、
組合わせ蒸気止弁(IV/ISV)の弁テスト中の弁の
誤った急閉を防止するので、出力の誤った絞り込みや原
子炉圧力変動(上昇)による原子炉スクラム、タービン
トリップの可能性が低下し、発電所の稼働率を向上させ
ることができる。また、タービンバイパス弁(TBV)
の弁テスト中の弁の誤った急開を防止するので、出力の
誤った絞り込みや原子炉圧力変動(下降)及び蒸気条件
の悪化(かわき蒸気から湿り蒸気に変わる)を防止し、
原子炉スクラム、タービントリップの可能性が低下し、
発電所の稼働率を向上させることができる。また、弁の
急閉あるいは急開について、タービントリップに至った
時のユーザーとメーカによる保守の対応として、弁テス
ト時の弁の誤った急閉あるいは急開を考慮する必要はな
く、結果として、対応が迅速になり、発電所の稼働率を
向上させることができる。また、弁の急閉あるいは急開
を防止するインターロックに、弁テスト時間を設定する
タイマーを用いないので、回路の設定値調整が不要とな
り、弁テスト時の対応を簡略化することができる。
As described above, according to the present invention,
Prevents accidental sudden closing of valves during combined steam stop valve (IV / ISV) valve testing, which may lead to reactor scram and turbine trips due to incorrect throttling of output or reactor pressure fluctuations (rise). And the operating rate of the power plant can be improved. In addition, a turbine bypass valve (TBV)
Prevents accidental sudden opening of the valve during valve testing, preventing incorrect throttling of output, fluctuations in reactor pressure (down) and deterioration of steam conditions (change from dry steam to wet steam).
The possibility of reactor scram and turbine trip has been reduced,
The operation rate of the power plant can be improved. Also, regarding the sudden closing or sudden opening of the valve, it is not necessary to consider erroneous sudden closing or sudden opening of the valve at the time of the valve test as a response of maintenance by the user and the manufacturer when the turbine trip occurs. The response will be quicker and the operating rate of the power plant can be improved. Further, since the timer for setting the valve test time is not used for the interlock for preventing the sudden closing or sudden opening of the valve, the adjustment of the set value of the circuit becomes unnecessary, and the response at the time of the valve test can be simplified.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明のタービン制御装置の一実施形態であ
り、組合わせ蒸気止弁(IV/ISV)の急速な閉動作
の制御方式を示す。
FIG. 1 is an embodiment of a turbine control device of the present invention, showing a control method of a rapid closing operation of a combined steam stop valve (IV / ISV).

【図2】原子力発電所のタービン制御の概略図を示す。FIG. 2 shows a schematic diagram of turbine control of a nuclear power plant.

【図3】従来の技術による組合わせ蒸気止弁の急速な閉
動作の制御方式を示す。
FIG. 3 shows a control method of a rapid closing operation of a combination steam stop valve according to the prior art.

【図4】本発明の他の実施形態であり、タービンバイパ
ス弁(TBV)の急速な開動作の制御方式を示す。
FIG. 4 is another embodiment of the present invention, showing a control method of a rapid opening operation of a turbine bypass valve (TBV).

【符号の説明】[Explanation of symbols]

1…信号切替器、2…タイマー、3…既定値の検出回
路、4…論理回路、5…既定値の検出回路、6…論理回
路、7…NOT回路、8…組合わせ蒸気止弁の急速な閉
動作の指令信号、9…弁開度検出によりフィードバック
される弁の実開度、10…系統動揺時等の負荷の変動に
より弁を不所望に急閉しない為の条件、101…既定値
の検出回路、102…動作条件1、40…論理回路、C
V…蒸気加減弁、IV/ISV…組合わせ蒸気止弁、T
BV…タービンバイパス弁
DESCRIPTION OF SYMBOLS 1 ... Signal switch, 2 ... Timer, 3 ... Default value detection circuit, 4 ... Logic circuit, 5 ... Default value detection circuit, 6 ... Logic circuit, 7 ... NOT circuit, 8 ... Combination steam stop valve rapid Command signal for proper closing operation, 9: actual opening of the valve fed back by detection of the opening of the valve, 10: conditions for preventing the valve from suddenly closing undesirably due to load fluctuations during system fluctuation, etc., 101: default value , Detecting circuit 102, operating condition 1, 40 ... logic circuit, C
V: Steam control valve, IV / ISV: Combined steam stop valve, T
BV: Turbine bypass valve

───────────────────────────────────────────────────── フロントページの続き (72)発明者 辻 真太郎 茨城県日立市大みか町五丁目2番1号 株 式会社日立製作所情報制御システム事業部 内 (72)発明者 河合 巧 茨城県日立市大みか町五丁目2番1号 株 式会社日立製作所情報制御システム事業部 内 Fターム(参考) 3G071 AA04 AB02 BA03 BA25 BA33 CA08 CA09 DA06 DA11 EA02 EA05 FA07 GA06 HA01 JA02 JA05  ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shintaro Tsuji 5-2-1 Omikacho, Hitachi City, Ibaraki Prefecture Within the Information Control Systems Division, Hitachi, Ltd. (72) Inventor Takumi Kawai Omikamachi, Hitachi City, Ibaraki Prefecture 5-2-1, F-term (reference), Information Control Systems Division, Hitachi, Ltd. 3G071 AA04 AB02 BA03 BA25 BA33 CA08 CA09 DA06 DA11 EA02 EA05 FA07 GA06 HA01 JA02 JA05

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 弁の急速な開,閉を制御する機能と弁テ
ストの機能をもつタービン制御装置であって、弁テスト
中に弁のスティック、インターロックの誤動作により起
こりうる誤った弁の急閉,急開を防止するために、弁テ
スト中においても弁急閉,急開の制御に、弁テスト指令
値を用いずに、プラント運転用の制御信号である弁開度
指令値を用い、前記弁開度指令値と弁の実開度(フィー
ドバック信号)の偏差が既定値となったことを条件に、
プラントにとって当該保護が必要な場合に限り、当該弁
の急速な開,閉を制御することを特徴とするタービン制
御装置。
1. A turbine control device having a function of controlling rapid opening and closing of a valve and a function of a valve test, wherein a sudden operation of an erroneous valve which may occur due to a malfunction of a valve stick or an interlock during a valve test. In order to prevent closing and sudden opening, the valve opening command value which is a control signal for plant operation is used for controlling the valve sudden closing and sudden opening even during the valve test, without using the valve test command value. On the condition that the deviation between the valve opening command value and the actual valve opening (feedback signal) of the valve has become a predetermined value,
A turbine control device for controlling the rapid opening and closing of the valve only when the plant needs the protection.
【請求項2】 請求項1において、前記弁開度指令値と
前記弁の実開度(フィードバック信号)の偏差を出力す
る手段と、該偏差出力が既定値となったことを条件に作
動する手段と、プラントにとって当該保護が必要な場合
に限り、当該弁の急速な開,閉制御信号を出力する手段
を有することを特徴とするタービン制御装置。
2. A means for outputting a deviation between the valve opening command value and the actual valve opening (feedback signal) of the valve according to claim 1, and operates on condition that the deviation output becomes a predetermined value. And a means for outputting a rapid opening and closing control signal for the valve only when the protection is necessary for the plant.
JP2000288164A 2000-09-22 2000-09-22 Turbine controller Expired - Fee Related JP3975457B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000288164A JP3975457B2 (en) 2000-09-22 2000-09-22 Turbine controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000288164A JP3975457B2 (en) 2000-09-22 2000-09-22 Turbine controller

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Publication Number Publication Date
JP2002097904A true JP2002097904A (en) 2002-04-05
JP3975457B2 JP3975457B2 (en) 2007-09-12

Family

ID=18771796

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000288164A Expired - Fee Related JP3975457B2 (en) 2000-09-22 2000-09-22 Turbine controller

Country Status (1)

Country Link
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104500150A (en) * 2014-11-28 2015-04-08 武汉大学 Piecewise linear model for actuating mechanism of turbine speed controller and parameter acquisition method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105840248B (en) * 2016-05-06 2017-06-30 国网浙江省电力公司电力科学研究院 A kind of steam turbine sliding pressure operation curve preparation method and device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104500150A (en) * 2014-11-28 2015-04-08 武汉大学 Piecewise linear model for actuating mechanism of turbine speed controller and parameter acquisition method

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