JP2014227915A - Turbine control device and turbine control method - Google Patents

Turbine control device and turbine control method Download PDF

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JP2014227915A
JP2014227915A JP2013108336A JP2013108336A JP2014227915A JP 2014227915 A JP2014227915 A JP 2014227915A JP 2013108336 A JP2013108336 A JP 2013108336A JP 2013108336 A JP2013108336 A JP 2013108336A JP 2014227915 A JP2014227915 A JP 2014227915A
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JP6212281B2 (en
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宏昭 新美
Hiroaki Niimi
宏昭 新美
孝 戸村
Takashi Tomura
孝 戸村
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Hitachi Ltd
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Abstract

PROBLEM TO BE SOLVED: To suppress output variation of a generator by controlling an opening of a steam regulating valve on the basis of a differential pressure ratio and generator output deviation in controlling valve switching.SOLUTION: A turbine control device includes a reference output storing part for storing a reference output as a reference value of an output of a generator connected to a turbine, a differential pressure ratio calculating part acquiring a first pressure of steam before passing through a main steam stop valve and a second pressure of steam after passing through the main steam stop valve during valve switching control to throttle a steam regulating valve and opening the main steam stop valve, and calculating a differential pressure ratio of the first pressure and the second pressure, an output difference calculating part acquiring a measured output as a measured value of the output of the generator and calculating output difference as the difference between a reference output and the measured output, and a steam regulating valve control part for controlling an opening of the steam regulating valve on the basis of the differential pressure ratio and the output difference.

Description

本発明は、タービンを制御する技術に関する。   The present invention relates to a technique for controlling a turbine.

タービン起動時には、主蒸気止め弁により蒸気を制御し、通常の負荷運転時には蒸気加減弁により蒸気を制御することが知られている。そのために、主蒸気止め弁から蒸気加減弁への弁切替制御が行われる。この弁切替制御において、タービン制御装置は、蒸気加減弁に対して絞り込み操作指令を出力し、主蒸気止め弁を通過する蒸気量と同等になる開度まで蒸気加減弁を絞り込む。   It is known that when the turbine is started, the steam is controlled by a main steam stop valve, and during normal load operation, the steam is controlled by a steam control valve. Therefore, valve switching control from the main steam stop valve to the steam control valve is performed. In this valve switching control, the turbine control device outputs a throttle operation command to the steam control valve, and narrows down the steam control valve to an opening that is equivalent to the amount of steam passing through the main steam stop valve.

弁切替制御は、主蒸気止め弁の前後蒸気圧力を監視しつつ、蒸気加減弁を絞り込む。すなわち、蒸気加減弁の絞り込みに応じて主蒸気止め弁後蒸気圧力が上昇し、これにより主蒸気止め弁前蒸気圧力と主蒸気止め弁後蒸気圧力との差圧比が規定差圧比以下となったとき、主蒸気止め弁を全開とする弁切替制御が行われる。   The valve switching control narrows down the steam control valves while monitoring the steam pressure before and after the main steam stop valve. That is, the steam pressure after the main steam stop valve rises according to the narrowing of the steam control valve, so that the differential pressure ratio between the steam pressure before the main steam stop valve and the steam pressure after the main steam stop valve becomes less than the specified differential pressure ratio. When the main steam stop valve is fully open, valve switching control is performed.

弁切替制御の第１の技術として、弁切替制御の開始直前の主蒸気圧力、温度、及び発電機出力から、蒸気加減弁について発電機出力変動を発生しない適正開度を求め、蒸気加減弁を適正開度＋αまで連続で閉方向に制御して、発電機出力変動を抑制する技術が知られている（例えば、特許文献１）。   As a first technique for valve switching control, an appropriate opening degree that does not cause fluctuations in generator output for the steam control valve is obtained from the main steam pressure, temperature, and generator output immediately before the start of valve switching control, and the steam control valve is A technique is known that controls the generator output fluctuation by continuously controlling in the closing direction up to an appropriate opening degree + α (for example, Patent Document 1).

弁切替制御の第２の技術として、弁切替制御の時間の短縮のため、主蒸気止め弁前蒸気圧力と主蒸気止め弁後蒸気圧力との差圧比を算出し、この差圧比に応じて蒸気加減弁を絞り込む操作量を、高速、中速、低速、微速と段階的に切替える技術が知られている（例えば、特許文献２）。   As a second technique of valve switching control, in order to shorten the time for valve switching control, a differential pressure ratio between the steam pressure before the main steam stop valve and the steam pressure after the main steam stop valve is calculated, and the steam is changed according to the differential pressure ratio. A technique is known in which the operation amount for narrowing the control valve is switched in stages from high speed, medium speed, low speed, and fine speed (for example, Patent Document 2).

特開平５−１９５７１３号公報JP-A-5-195713 特開２００５−１５５３９１号公報JP 2005-155391 A

弁切替制御時の発電機出力変動を抑えるように初期調整を行っても、プラントの蒸気条件等及び経年による機械的特性の変化等により、蒸気加減弁の絞り込みに応じて主蒸気止め弁を開けても、発電機出力変動を抑えられない事象が発生することがある。発電機出力が変動するとボイラ系統を含めたプラント全体及び系統への外乱となり、プラント寿命や電力系統に対して影響を与える。   Even if initial adjustment is performed to suppress fluctuations in generator output during valve switching control, the main steam stop valve is opened according to the narrowing of the steam control valve due to changes in the plant steam conditions and mechanical characteristics over time. However, an event may occur in which fluctuations in generator output cannot be suppressed. If the generator output fluctuates, it will cause disturbances to the entire plant and the system including the boiler system, which will affect the plant life and the power system.

上記課題を解決するために、本発明の一態様であるタービン制御装置は、タービンに接続されている発電機の出力の基準値である基準出力を記憶する基準出力記憶部と、ボイラから流入する蒸気量を調節する主蒸気止め弁と、前記主蒸気止め弁を通り前記タービンへ流入する蒸気量を調節する蒸気加減弁とに対し、前記蒸気加減弁を絞ると共に前記主蒸気止め弁を開く弁切替制御中に、前記主蒸気止め弁を通過する前の蒸気の第１圧力と、前記主蒸気止め弁を通過した後の蒸気の第２圧力とを取得し、前記第１圧力及び前記第２圧力の差圧比を算出する差圧比算出部と、前記発電機の出力の測定値である測定出力を取得し、前記基準出力及び前記測定出力の差である出力差を算出する出力差算出部と、前記差圧比及び前記出力差に基づいて、前記蒸気加減弁の開度を制御する蒸気加減弁制御部と、を備える。   In order to solve the above problems, a turbine control apparatus according to an aspect of the present invention flows from a boiler, a reference output storage unit that stores a reference output that is a reference value of an output of a generator connected to the turbine, and the boiler A valve that throttles the steam control valve and opens the main steam stop valve with respect to a main steam stop valve that controls the amount of steam and a steam control valve that controls the amount of steam that passes through the main steam stop valve and flows into the turbine During the switching control, a first pressure of the steam before passing through the main steam stop valve and a second pressure of the steam after passing through the main steam stop valve are acquired, and the first pressure and the second pressure are acquired. A differential pressure ratio calculation unit that calculates a differential pressure ratio of pressure; an output difference calculation unit that acquires a measurement output that is a measurement value of the output of the generator and calculates an output difference that is a difference between the reference output and the measurement output; , Based on the differential pressure ratio and the output difference, Serial comprises a steam control valve controller for controlling the opening of the steam control valve, the.

本発明の一態様によれば、弁切替制御において、差圧比と発電機出力に基づいて蒸気加減弁の開度を制御することにより、発電機出力変動を抑えることができる。   According to one aspect of the present invention, in the valve switching control, the output fluctuation of the generator can be suppressed by controlling the opening of the steam control valve based on the differential pressure ratio and the generator output.

本発明の実施例のタービン制御装置の構成を示す。The structure of the turbine control apparatus of the Example of this invention is shown. 加減弁操作量算出部４２０の構成を示す。3 shows the configuration of the control valve operation amount calculation unit 420. 発電機出力偏差算出部４３０と加減弁操作量補正部４４０の構成を示す。The structure of the generator output deviation calculation part 430 and the adjustment valve operation amount correction | amendment part 440 is shown. 弁切替制御と発電機出力変動の関係を示す。The relationship between valve switching control and generator output fluctuation is shown.

以下、本発明の実施例について図面を参照しつつ説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図１は、本発明の実施例のタービン制御装置の構成を示す。   FIG. 1 shows the configuration of a turbine control apparatus according to an embodiment of the present invention.

プラントは、ボイラ１００と、タービン２００と、発電機３００と、タービン制御装置４００とを有する。更にプラントは、ボイラ１００からタービン２００へ流れる蒸気の流路内に、主蒸気止め弁（Ｍａｉｎ Ｓｔｏｐ Ｖａｌｖｅ：ＭＳＶ）１２０と、蒸気加減弁（Ｃｏｎｔｒｏｌ Ｖａｌｖｅ：ＣＶ）１４０とを有する。   The plant includes a boiler 100, a turbine 200, a generator 300, and a turbine control device 400. Further, the plant includes a main steam stop valve (MSV) 120 and a steam control valve (CV) 140 in a flow path of steam flowing from the boiler 100 to the turbine 200.

蒸気加減弁１４０は、発電機３００と直結されたタービン２００への駆動蒸気を調節する。主蒸気止め弁１２０は、タービン２００に流入する蒸気をせき止める。主蒸気止め弁１２０と蒸気加減弁１４０の夫々は、弁を駆動するための駆動装置を有する。タービン制御装置４００は、主蒸気止め弁１２０の駆動装置を制御するための主蒸気止め弁操作量を出力し、蒸気加減弁１４０の駆動装置を制御するための絞り込み量を出力する。主蒸気止め弁操作量は、主蒸気止め弁１２０の開度を増加させる量を示し、絞り込み量は、蒸気加減弁１４０の開度を減少させる量を示す。なお、主蒸気止め弁操作量は、主蒸気止め弁１２０の開度を減少させる量を示しても良いし、主蒸気止め弁１２０の開度を示しても良い。また、絞り込み量は、蒸気加減弁１４０の開度を増加させる量を示しても良いし、蒸気加減弁１４０の開度を示しても良い。   The steam control valve 140 adjusts driving steam to the turbine 200 directly connected to the generator 300. The main steam stop valve 120 blocks steam flowing into the turbine 200. Each of the main steam stop valve 120 and the steam control valve 140 has a drive device for driving the valve. The turbine control device 400 outputs a main steam stop valve operation amount for controlling the drive device of the main steam stop valve 120, and outputs a throttle amount for controlling the drive device of the steam control valve 140. The main steam stop valve operation amount indicates the amount by which the opening degree of the main steam stop valve 120 is increased, and the throttle amount indicates the amount by which the opening degree of the steam control valve 140 is decreased. The main steam stop valve operation amount may indicate the amount by which the opening degree of the main steam stop valve 120 is decreased, or may indicate the opening degree of the main steam stop valve 120. The throttle amount may indicate an amount by which the opening of the steam control valve 140 is increased, or may indicate the opening of the steam control valve 140.

更にプラントは、蒸気の流路内で、主蒸気止め弁１２０の前に設けられ、主蒸気止め弁前蒸気圧力を検出する主蒸気止め弁前圧検出器１１０と、主蒸気止め弁１２０の後に設けられ、主蒸気止め弁後蒸気圧力を検出する主蒸気止め弁後圧検出器１３０とを有する。   Further, the plant is provided in front of the main steam stop valve 120 in the steam flow path, and after the main steam stop valve 120 and the main steam stop valve pre-pressure detector 110 for detecting the steam pressure before the main steam stop valve. And a main steam stop valve post-pressure detector 130 for detecting the steam pressure after the main steam stop valve.

タービン制御装置４００は、差圧比算出部４１０と、加減弁操作量算出部４２０と、発電機出力偏差算出部４３０と、加減弁操作量補正部４４０と、主蒸気止め弁制御部４５０と、運転時制御部４６０と、全開操作量記憶部４７０と、切替器５２０と、切替器５３０と、弁切替開始判定部５４０と、弁切替完了判定部５５０とを有する。タービン制御装置４００は、マイクロプロセッサ及びメモリを有していても良い。この場合、メモリがプログラム及びデータを格納し、マイクロプロセッサがメモリ内のプログラムに従ってタービン制御装置４００の動作を実行しても良い。また、タービン制御装置４００は、オペレータからの入力を取得する入力部や、プラントの状態を表示する表示部を有していても良い。   The turbine control device 400 includes a differential pressure ratio calculation unit 410, an adjustment valve operation amount calculation unit 420, a generator output deviation calculation unit 430, an adjustment valve operation amount correction unit 440, a main steam stop valve control unit 450, and an operation. It has a time control unit 460, a fully opened operation amount storage unit 470, a switch 520, a switch 530, a valve switching start determination unit 540, and a valve switching completion determination unit 550. The turbine control device 400 may include a microprocessor and a memory. In this case, the memory may store the program and data, and the microprocessor may execute the operation of the turbine control device 400 according to the program in the memory. Further, the turbine control device 400 may include an input unit that acquires input from an operator and a display unit that displays the state of the plant.

弁切替開始判定部５４０は、オペレータから入力される弁切替開始の指示に応じて、弁切替開始信号を有効にする。なお、弁切替開始判定部５４０は、タービンの起動の段階を判定し、起動の段階が所定の段階に達した場合に、弁切替開始信号を有効にしても良い。弁切替制御は、全開の蒸気加減弁１４０を徐々に絞り込み、一定の条件が成立したときに、主蒸気止め弁１２０を全開にする。   The valve switching start determination unit 540 validates the valve switching start signal in response to a valve switching start instruction input from the operator. The valve switching start determination unit 540 may determine the stage of turbine startup, and may validate the valve switching start signal when the startup stage reaches a predetermined stage. In the valve switching control, the fully open steam control valve 140 is gradually throttled, and when a certain condition is satisfied, the main steam stop valve 120 is fully opened.

差圧比算出部４１０は、主蒸気止め弁前圧検出器１１０により検出された主蒸気止め弁前蒸気圧力と、主蒸気止め弁後圧検出器１３０により検出された主蒸気止め弁後蒸気圧力とを定期的に取得する。その後、差圧比算出部４１０は、主蒸気止め弁前蒸気圧力から主蒸気止め弁後蒸気圧力を減ずることにより偏差を求め、主蒸気止め弁前蒸気圧力に対する偏差の比である差圧比を算出する。   The differential pressure ratio calculation unit 410 includes a main steam stop valve pre-pressure detector 110 detected by the main steam stop valve pre-pressure detector 110 and a main steam stop valve post-pressure detector 130 detected by the main steam stop valve post-pressure detector 130. Get on a regular basis. Thereafter, the differential pressure ratio calculation unit 410 obtains a deviation by subtracting the steam pressure after the main steam stop valve from the steam pressure before the main steam stop valve, and calculates a differential pressure ratio that is a ratio of the deviation to the steam pressure before the main steam stop valve. .

弁切替完了判定部５５０は、差圧比が弁切替完了条件を満たすか否かを判定し、差圧比が弁切替完了条件を満たしている場合、弁切替制御の完了を示す弁切替完了信号を有効にする。例えば、弁切替完了判定部５５０は、差圧比が所定の差圧比閾値以下になった場合に、差圧比が弁切替完了条件を満たしたと判定する。差圧比閾値は例えば、１５％である。   The valve switching completion determination unit 550 determines whether or not the differential pressure ratio satisfies the valve switching completion condition. When the differential pressure ratio satisfies the valve switching completion condition, a valve switching completion signal indicating the completion of the valve switching control is validated. To. For example, the valve switching completion determination unit 550 determines that the differential pressure ratio satisfies the valve switching completion condition when the differential pressure ratio is equal to or less than a predetermined differential pressure ratio threshold. The differential pressure ratio threshold is, for example, 15%.

加減弁操作量算出部４２０は、差圧比に基づいて絞り込み量の基になる基本絞り込み量を算出する。発電機出力偏差算出部４３０は、発電機３００の出力の基準値を記憶し、発電機３００の出力の測定値を取得し、基準値に対する測定値の偏差である発電機出力偏差を算出する。加減弁操作量補正部４４０は、発電機出力偏差に基づいて、基本絞り込み量を補正することにより、弁切替時絞り込み量を算出する。   The control valve operation amount calculation unit 420 calculates a basic throttle amount that is a basis of the throttle amount based on the differential pressure ratio. The generator output deviation calculation unit 430 stores the reference value of the output of the generator 300, acquires the measured value of the output of the generator 300, and calculates the generator output deviation that is the deviation of the measured value with respect to the reference value. The rectifying valve operation amount correcting unit 440 calculates the valve switching narrowing amount by correcting the basic narrowing amount based on the generator output deviation.

運転時制御部４６０は、弁切替完了後の通常の負荷運転時の蒸気加減弁１４０を絞り込むための操作量である運転時絞り込み量を出力する。例えば、運転時制御部４６０は、発電機出力偏差に基づいて運転時絞り込み量を算出する。切替器５２０は、弁切替時絞り込み量と運転時絞り込み量とを入力され、制御信号として弁切替完了信号を入力される。切替器５２０は、弁切替完了信号が有効でない場合に、弁切替時絞り込み量を選択し絞り込み量として出力し、弁切替完了信号が有効である場合に、運転時絞り込み量を選択し絞り込み量として出力する。   The operation time control unit 460 outputs an operation time narrowing amount that is an operation amount for narrowing down the steam control valve 140 during normal load operation after the valve switching is completed. For example, the operation time control unit 460 calculates the operation time narrowing amount based on the generator output deviation. The switch 520 receives the valve switching narrowing amount and the operation narrowing amount, and receives a valve switching completion signal as a control signal. When the valve switching completion signal is not valid, the switcher 520 selects and outputs the throttle amount at the time of valve switching as the throttle amount. When the valve switching completion signal is valid, the selector 520 selects the throttle amount at the time of operation as the throttle amount. Output.

主蒸気止め弁制御部４５０は、発電機出力偏差に基づいて、弁切替時の主蒸気止め弁１２０の開度の操作量である弁切替時主蒸気止め弁操作量を出力する。全開操作量記憶部４７０は、主蒸気止め弁１２０を全開にするための操作量である全開操作量を出力する。切替器５３０は、弁切替時主蒸気止め弁操作量と全開操作量とを入力され、制御信号として弁切替完了信号が入力されていない場合に、弁切替時主蒸気止め弁操作量を選択し主蒸気止め弁操作量として出力し、制御信号として弁切替完了信号が入力されている場合に、全開操作量を選択し主蒸気止め弁操作量として出力する。   Based on the generator output deviation, the main steam stop valve control unit 450 outputs a main steam stop valve operation amount during valve switching, which is an operation amount of the opening degree of the main steam stop valve 120 during valve switching. The fully open operation amount storage unit 470 outputs a fully open operation amount that is an operation amount for fully opening the main steam stop valve 120. The switch 530 selects the main steam stop valve operation amount at the time of valve switching when the main steam stop valve operation amount and the fully open operation amount at the time of valve switching are input and the valve switching completion signal is not input as a control signal. When a valve switching completion signal is input as a control signal, the fully open operation amount is selected and output as the main steam stop valve operation amount.

図２は、加減弁操作量算出部４２０の構成を示す。   FIG. 2 shows a configuration of the adjusting valve operation amount calculation unit 420.

加減弁操作量算出部４２０は、関数演算器６１０と、減算器６２０とを有する。関数演算器６１０は、関数６１１を格納する。関数６１１は、差圧比と、蒸気加減弁１４０の目標の開度を示す目標加減弁開度（目標開度）との関係を示す。関数演算器６１０は、関数６１１を用いて、差圧比から目標加減弁開度を算出する。図中の関数６１１において、横軸は差圧比を示し、縦軸は、目標加減弁開度を示す。関数演算器６１０は、関数６１１により、差圧比が大きくなる程、目標加減弁開度を小さくする。関数６１１は、弁組み合わせ試験や、定期点検時に入手したデータやシミュレーションにより計算され、関数演算器６１０のメモリに格納される。関数演算器６１０は、関数６１１の係数を格納しても良い。減算器６２０は、現在の蒸気加減弁１４０の開度である加減弁開度を取得し、加減弁開度から目標加減弁開度を減ずることにより、基本絞り込み量を算出する。基本絞り込み量は、蒸気加減弁１４０の開度を減少させる量である。即ち、加減弁開度を基本絞り込み量だけ減少させることにより目標加減弁開度にすることができる。これにより、加減弁操作量算出部４２０は、差圧比が大きくなる程、絞り込み量を大きくする。なお、基本絞り込み量は、蒸気加減弁１４０の開度を増加させる量であっても良い。   The adjustment valve operation amount calculation unit 420 includes a function calculator 610 and a subtractor 620. The function calculator 610 stores the function 611. A function 611 shows the relationship between the differential pressure ratio and the target valve opening (target opening) indicating the target opening of the steam control valve 140. The function calculator 610 uses the function 611 to calculate the target valve opening degree from the differential pressure ratio. In the function 611 in the figure, the horizontal axis indicates the differential pressure ratio, and the vertical axis indicates the target control valve opening. The function calculator 610 reduces the target valve opening degree by the function 611 as the differential pressure ratio increases. The function 611 is calculated by a valve combination test, data obtained during periodic inspection, and simulation, and stored in the memory of the function calculator 610. The function calculator 610 may store the coefficient of the function 611. The subtractor 620 calculates the basic throttle amount by acquiring the valve opening degree that is the current opening degree of the steam control valve 140 and subtracting the target valve opening degree from the valve opening degree. The basic throttle amount is an amount by which the opening degree of the steam control valve 140 is decreased. That is, the target valve opening degree can be achieved by reducing the valve opening degree by the basic throttle amount. Thereby, the increasing / decreasing valve operation amount calculation unit 420 increases the narrowing amount as the differential pressure ratio increases. Note that the basic throttle amount may be an amount by which the opening degree of the steam control valve 140 is increased.

もし、試運転時の試験のデータに基づいて弁切替制御の設定値を決定し、設定値を初期設定により与えるとすると、プラントの蒸気条件等及び経年による機械的特性の変化等に伴い初期設定と相違する挙動となる場合がある。一方、本実施例の関数６１１は、通常運転や定期検査から得られるデータに基づいて変更することができる。ここでのデータは、主蒸気止め弁前蒸気圧力、主蒸気止め弁後蒸気圧力、発電機出力、主蒸気止め弁開度、蒸気加減弁開度等である。これにより、プラントの状態に適した関数６１１を実現することができる。また、プラントの蒸気条件及び機械的特性変動に関わらず、弁切替制御による蒸気加減弁１４０の絞り込み時間を短縮することができる。   If the set value of valve switching control is determined based on the test data at the time of trial operation, and the set value is given by the initial setting, the initial setting and the mechanical characteristics change due to the steam conditions of the plant, etc. Different behavior may occur. On the other hand, the function 611 of the present embodiment can be changed based on data obtained from normal operation or periodic inspection. The data here are steam pressure before the main steam stop valve, steam pressure after the main steam stop valve, generator output, main steam stop valve opening, steam control valve opening, and the like. Thereby, the function 611 suitable for the state of the plant can be realized. Further, the time for narrowing the steam control valve 140 by the valve switching control can be shortened regardless of the steam condition and mechanical characteristic fluctuation of the plant.

タービン２００へ流入する蒸気量の変動は、発電機出力変動の原因となる。差圧比が大きい場合、主蒸気止め弁１２０によりタービン２００へ流入する蒸気量を絞っているため、蒸気加減弁１４０を大きく絞り込んでも、タービン２００へ流入する蒸気量の変動は少ない。逆に差圧比が小さい場合、蒸気加減弁１４０を大きく絞り込むと、タービン２００へ流入する蒸気量の変動に大きく影響する。このため、加減弁操作量算出部４２０は、差圧比が大きい程、基本絞り込み量を大きくする。これにより、弁切替制御において発電機出力変動を抑えつつ、蒸気加減弁１４０の絞り込みの時間を短縮することができる。   Variations in the amount of steam flowing into the turbine 200 cause variations in generator output. When the differential pressure ratio is large, the amount of steam flowing into the turbine 200 is throttled by the main steam stop valve 120. Therefore, even when the steam control valve 140 is greatly throttled, the variation in the amount of steam flowing into the turbine 200 is small. On the contrary, when the differential pressure ratio is small, if the steam control valve 140 is narrowed down greatly, the fluctuation of the steam amount flowing into the turbine 200 is greatly affected. For this reason, the increasing / decreasing valve operation amount calculation unit 420 increases the basic narrowing amount as the differential pressure ratio increases. Thereby, the time for narrowing the steam control valve 140 can be shortened while suppressing the generator output fluctuation in the valve switching control.

図３は、発電機出力偏差算出部４３０と加減弁操作量補正部４４０の構成を示す。   FIG. 3 shows the configuration of the generator output deviation calculation unit 430 and the adjustment valve operation amount correction unit 440.

発電機出力偏差算出部４３０は、発電機３００から発電機出力（測定出力）を定期的に取得する。発電機出力偏差算出部４３０は、保持器７１０と、減算器７２０とを有する。保持器７１０は、制御信号である弁切替開始信号が有効になると、発電機出力を基準発電機出力（基準出力）として保持する。減算器７２０は、発電機出力から基準発電機出力を減ずることにより、基準発電機出力に対する発電機出力の偏差を示す発電機出力偏差を算出する。このような発電機出力偏差を用いることにより、発電機出力を弁切替制御の開始時の発電機出力に近づけるように、蒸気加減弁１４０と主蒸気止め弁１２０を制御することができる。なお、基準発電機出力は、予め定められた値であっても良い。   The generator output deviation calculation unit 430 periodically acquires the generator output (measurement output) from the generator 300. The generator output deviation calculation unit 430 includes a holder 710 and a subtracter 720. The retainer 710 retains the generator output as a reference generator output (reference output) when a valve switching start signal that is a control signal becomes valid. The subtractor 720 calculates a generator output deviation indicating a deviation of the generator output with respect to the reference generator output by subtracting the reference generator output from the generator output. By using such a generator output deviation, it is possible to control the steam control valve 140 and the main steam stop valve 120 so that the generator output approaches the generator output at the start of the valve switching control. The reference generator output may be a predetermined value.

加減弁操作量補正部４４０は、ゲイン８１０と、ゲイン８２０と、符号反転器８３０と、制限器８４０と、切替器８６０と、加算器８７０とを有する。   The adjustable valve operation amount correction unit 440 includes a gain 810, a gain 820, a sign inverter 830, a limiter 840, a switch 860, and an adder 870.

ゲイン８１０は、発電機出力偏差に所定の補正量比率（所定の比率）を乗ずる。   The gain 810 multiplies the generator output deviation by a predetermined correction amount ratio (predetermined ratio).

ゲイン８２０は、基本絞り込み量に所定の補正範囲比率を乗ずることにより、補正量上限を算出する。符号反転器８３０は、補正量上限の符号を反転することにより、補正量下限を算出する。制限器８４０は、ゲイン８１０の出力を、補正量下限と補正量上限で規定される範囲内に制限する。例えば、制限器８４０は、ゲイン８１０の出力が補正量下限以上且つ補正量上限以下であれば、ゲイン８１０の出力をそのまま出力し、ゲイン８１０の出力が補正量下限より小さい場合、補正量下限を出力し、ゲイン８１０の出力が補正量上限より大きい場合、補正量上限を出力する。制限器８４０がゲイン８１０の出力を制限することにより、蒸気加減弁１４０を絞れなくなったり、蒸気加減弁１４０を急激に絞ったりすることを防ぐことができる。   The gain 820 calculates the upper limit of the correction amount by multiplying the basic narrowing amount by a predetermined correction range ratio. The sign inverter 830 calculates the correction amount lower limit by inverting the sign of the correction amount upper limit. The limiter 840 limits the output of the gain 810 within a range defined by the correction amount lower limit and the correction amount upper limit. For example, the limiter 840 outputs the output of the gain 810 as it is if the output of the gain 810 is not less than the correction amount lower limit and not more than the correction amount upper limit, and if the output of the gain 810 is smaller than the correction amount lower limit, the correction amount lower limit is set. If the output of gain 810 is greater than the upper limit of correction amount, the upper limit of correction amount is output. By limiting the output of the gain 810 by the limiter 840, it is possible to prevent the steam control valve 140 from being throttled or the steam control valve 140 from being throttled rapidly.

なお、ゲイン８１０、８２０、及び制限器８４０の何れかは、予め記憶する関数を用いて演算を行う関数演算器であっても良い。   Note that any of the gains 810 and 820 and the limiter 840 may be a function calculator that performs a calculation using a function stored in advance.

切替器８６０は、制限器８４０の出力と０とを入力され、制御信号として弁切替完了信号を入力される。切替器８６０は、弁切替完了信号が有効でない場合、制限器８４０の出力を選択し補正量として出力し、弁切替完了信号が有効である場合、０を選択し補正量として出力する。加算器８７０は、基本絞り込み量に補正量を加えることにより、弁切替時絞り込み量を算出する。例えば、基準発電機出力に対して発電機出力が小さい場合、補正量が負になるため、基本絞り込み量に対して弁切替時絞り込み量を減少させる。なお、発電機出力偏差は、基準発電機出力から発電機出力を減じた値であっても良い。このような場合、加算器８７０は、基本絞り込み量から補正量を減じても良い。   The switch 860 receives the output of the limiter 840 and 0, and receives a valve switching completion signal as a control signal. When the valve switching completion signal is not valid, the switch 860 selects the output of the limiter 840 and outputs it as a correction amount. When the valve switching completion signal is valid, the switch 860 selects 0 and outputs it as the correction amount. The adder 870 calculates the valve switching narrowing amount by adding a correction amount to the basic narrowing amount. For example, when the generator output is small with respect to the reference generator output, the correction amount becomes negative. Therefore, the valve switching narrowing amount is decreased with respect to the basic narrowing amount. The generator output deviation may be a value obtained by subtracting the generator output from the reference generator output. In such a case, the adder 870 may subtract the correction amount from the basic narrowing amount.

蒸気加減弁１４０を基本絞り込み量だけ絞り込むと、発電機出力が低下する場合がある。基本絞り込み量に補正量を加えることにより、過大な絞り込み量による発電機出力の低下を抑えることができる。   If the steam control valve 140 is narrowed by the basic throttle amount, the generator output may decrease. By adding a correction amount to the basic narrowing amount, it is possible to suppress a decrease in generator output due to an excessive narrowing amount.

以下、弁切替制御における主蒸気止め弁１２０の制御について説明する。   Hereinafter, the control of the main steam stop valve 120 in the valve switching control will be described.

主蒸気止め弁１２０は、主蒸気止め弁１２０の開度を細かく調節するための主蒸気止め小弁（Ｍａｉｎ Ｓｔｏｐ Ｂｙｐａｓｓ Ｖａｌｖｅ：ＭＳＢＶ）を有する。主蒸気止め小弁は、切替器５３０の出力に従って主蒸気止め弁１２０の開度を所定割合以内で調節する。主蒸気止め弁制御部４５０は、発電機出力偏差に応じて主蒸気止め弁操作量を算出する。ここで、主蒸気止め弁制御部４５０は、発電機出力偏差が所定の０以下の偏差閾値（出力差閾値）を下回る場合に、主蒸気止め小弁の開度を増大させても良い。また、主蒸気止め弁制御部４５０は、発電機出力偏差が偏差閾値を下回る場合に、発電機出力偏差の絶対値の増大に応じて、主蒸気止め小弁の開度を増大させても良い。   The main steam stop valve 120 has a main steam stop valve (MSBV) for finely adjusting the opening degree of the main steam stop valve 120. The main steam stop small valve adjusts the opening degree of the main steam stop valve 120 within a predetermined ratio according to the output of the switch 530. The main steam stop valve control unit 450 calculates the main steam stop valve operation amount according to the generator output deviation. Here, the main steam stop valve controller 450 may increase the opening degree of the main steam stop small valve when the generator output deviation falls below a predetermined deviation threshold value (output difference threshold value) of 0 or less. Further, the main steam stop valve control unit 450 may increase the opening of the main steam stop valve according to the increase in the absolute value of the generator output deviation when the generator output deviation is below the deviation threshold. .

基準発電機出力に対して発電機出力が低下した場合に主蒸気止め小弁の開度を増大させることにより、発電機出力の低下を抑えることができる。また、蒸気加減弁１４０を絞り込むことによるタービン２００への流入蒸気（発電機出力）の減少を、主蒸気止め小弁を開くことで補い、補いきれない場合は補正量により蒸気加減弁１４０の絞り込み量を抑制することで、発電機出力変動を抑制することができる。   When the generator output decreases with respect to the reference generator output, the decrease in the generator output can be suppressed by increasing the opening of the main steam stop small valve. Further, the reduction of the steam (generator output) flowing into the turbine 200 due to the narrowing of the steam control valve 140 is compensated by opening the main steam stop small valve, and if it cannot be compensated, the steam control valve 140 is narrowed by the correction amount. By suppressing the amount, the generator output fluctuation can be suppressed.

以下、本実施例のタービン制御装置４００の効果について、前述の第２の技術のタービン制御装置と比較して説明する。   Hereinafter, the effect of the turbine control apparatus 400 of the present embodiment will be described in comparison with the turbine control apparatus of the second technique described above.

図４は、弁切替制御と発電機出力変動の関係を示す。   FIG. 4 shows the relationship between the valve switching control and the generator output fluctuation.

この図における横軸は、時間である。ＬＬＭ（Ｌｏａｄ Ｌｉｍｉｔｔｅｒ：蒸気加減弁）位置９１０ａは、本実施例による蒸気加減弁１４０の開度を示す。ＭＳＶ（Ｍａｉｎ Ｓｔｏｐ Ｖａｌｖｅ：主蒸気止め弁）差圧比９２０ａは、本実施例による差圧比を示す。発電機出力９３０ａは、本実施例による発電機３００の出力を示す。基準発電機出力９４０は、弁切替開始信号の発生時の発電機出力９３０ａの値である。ＭＳＢＶ位置９５０は、本実施例による主蒸気止め小弁の開度を示す。差圧比閾値９６０は、弁切替完了条件を示す。差圧比９２０ａが差圧比閾値９６０以下になると、弁切替完了信号が有効になる。   The horizontal axis in this figure is time. An LLM (Load Limiter) position 910a indicates the opening degree of the steam control valve 140 according to this embodiment. The MSV (Main Stop Valve) differential pressure ratio 920a indicates the differential pressure ratio according to this embodiment. The generator output 930a indicates the output of the generator 300 according to the present embodiment. The reference generator output 940 is the value of the generator output 930a when the valve switching start signal is generated. The MSBV position 950 indicates the opening degree of the main steam stop small valve according to this embodiment. The differential pressure ratio threshold value 960 indicates a valve switching completion condition. When the differential pressure ratio 920a becomes equal to or less than the differential pressure ratio threshold value 960, the valve switching completion signal becomes valid.

一方、ＬＬＭ位置９１０ｂは、前述の第２の技術による蒸気加減弁の開度を示す。ＭＳＶ差圧比９２０ｂは、第２の技術による差圧比を示す。発電機出力９３０ｂは、第２の技術による発電機出力を示す。   On the other hand, the LLM position 910b indicates the opening degree of the steam control valve according to the second technique described above. The MSV differential pressure ratio 920b indicates a differential pressure ratio according to the second technique. The generator output 930b indicates the generator output according to the second technique.

第２の技術は、差圧比に応じて蒸気加減弁の絞り込み量を、高速、中速、低速、微速と段階的に切替える。一方、本実施例のタービン制御装置４００は、差圧比に基づいて目標加減弁開度を算出し、目標加減弁開度に基づいて基本絞り込み量を算出し、発電機出力偏差に基づいて基本絞り込み量を補正する。更に、本実施例の弁切替制御は、発電機出力偏差が所定の偏差閾値を下回ると、主蒸気止め小弁の開度を増大させる。これにより、本実施例の発電機出力９３０ａの変動は、第２の技術の発電機出力９３０ｂの変動より小さくなる。   According to the second technique, the throttle amount of the steam control valve is switched stepwise from high speed, medium speed, low speed, and fine speed according to the differential pressure ratio. On the other hand, the turbine control device 400 of the present embodiment calculates a target valve opening based on the differential pressure ratio, calculates a basic throttle amount based on the target valve opening, and performs basic throttle based on the generator output deviation. Correct the amount. Furthermore, the valve switching control of this embodiment increases the opening of the main steam stop small valve when the generator output deviation falls below a predetermined deviation threshold. Thereby, the fluctuation | variation of the generator output 930a of a present Example becomes smaller than the fluctuation | variation of the generator output 930b of a 2nd technique.

以上の実施例で説明された技術は、次のように表現することもできる。
（表現１）
タービンに接続されている発電機の出力の基準値である基準出力を記憶する基準出力記憶部と、
ボイラから流入する蒸気量を調節する主蒸気止め弁と、前記主蒸気止め弁を通り前記タービンへ流入する蒸気量を調節する蒸気加減弁とに対し、前記蒸気加減弁を絞ると共に前記主蒸気止め弁を開く弁切替制御中に、前記主蒸気止め弁を通過する前の蒸気の第１圧力と、前記主蒸気止め弁を通過した後の蒸気の第２圧力とを取得し、前記第１圧力及び前記第２圧力の差圧比を算出する差圧比算出部と、
前記発電機の出力の測定値である測定出力を取得し、前記基準出力及び前記測定出力の差である出力差を算出する出力差算出部と、
前記差圧比及び前記出力差に基づいて、前記蒸気加減弁の開度を制御する蒸気加減弁制御部と、
を備えるタービン制御装置。
（表現２）
前記蒸気加減弁制御部は、前記差圧比に基づいて前記蒸気加減弁の目標開度を算出し、前記蒸気加減弁の開度を前記目標開度へ合わせるための基本操作量を算出し、前記出力差に所定の比率を乗じた値に基づいて前記蒸気加減弁の開度の補正量を算出し、前記基本操作量に前記補正量を加えることにより、前記蒸気加減弁の開度の操作量を算出する、
表現１に記載のタービン制御装置。
（表現３）
前記蒸気加減弁制御部は、前記蒸気加減弁の開度から前記目標開度を減ずることにより、前記基本操作量を算出し、前記測定出力から前記基準出力を減ずることにより前記出力差を算出し、前記蒸気加減弁の開度を前記操作量だけ減少させる、
表現２に記載のタービン制御装置。
（表現４）
前記蒸気加減弁制御部は、前記差圧比と前記目標開度との関係を記憶し、前記関係を用いて、前記差圧比に応じた前記目標開度を算出する、
表現３に記載のタービン制御装置。
（表現５）
前記基準出力記憶部は、前記弁切替制御の指示に応じて前記測定出力を取得し前記基準出力として記憶する、
表現４に記載のタービン制御装置。
（表現６）
前記蒸気加減弁制御部は、前記基本操作量に基づいて前記補正量の範囲を制限する、
表現５に記載のタービン制御装置。
（表現７）
前記主蒸気止め弁は、前記主蒸気止め弁の一部の開度を調節する主蒸気止め小弁を有し、
前記出力差に基づいて前記主蒸気止め小弁の開度を制御する主蒸気止め弁制御部を、更に備える、
表現６に記載のタービン制御装置。
（表現８）
前記主蒸気止め弁制御部は、前記出力差が所定の０以下の出力差閾値より小さい場合に、前記出力差の絶対値の増大に応じて前記主蒸気止め小弁の開度を増大させる、
表現７に記載のタービン制御装置。
（表現９）
タービンに接続されている発電機の出力の基準値である基準出力を記憶し、
ボイラから流入する蒸気量を調節する主蒸気止め弁と、前記主蒸気止め弁を通り前記タービンへ流入する蒸気量を調節する蒸気加減弁とに対し、前記蒸気加減弁を絞ると共に前記主蒸気止め弁を開く弁切替制御中に、前記主蒸気止め弁を通過する前の蒸気の第１圧力と、前記主蒸気止め弁を通過した後の蒸気の第２圧力とを取得し、前記第１圧力及び前記第２圧力の差圧比を算出し、
前記発電機の出力の測定値である測定出力を取得し、前記基準出力及び前記測定出力の差である出力差を算出し、
前記差圧比及び前記出力差に基づいて、前記蒸気加減弁の開度を制御する、
ことを備えるタービン制御方法。 The techniques described in the above embodiments can also be expressed as follows.
(Expression 1)
A reference output storage unit that stores a reference output that is a reference value of the output of the generator connected to the turbine;
The main steam stop valve and the main steam stop valve are throttled with respect to a main steam stop valve that adjusts the amount of steam flowing from the boiler and a steam control valve that controls the amount of steam that passes through the main steam stop valve and flows into the turbine. During valve switching control for opening a valve, a first pressure of steam before passing through the main steam stop valve and a second pressure of steam after passing through the main steam stop valve are acquired, and the first pressure And a differential pressure ratio calculation unit for calculating a differential pressure ratio of the second pressure,
An output difference calculation unit that obtains a measurement output that is a measurement value of the output of the generator and calculates an output difference that is a difference between the reference output and the measurement output;
A steam control valve controller that controls the opening of the steam control valve based on the differential pressure ratio and the output difference;
A turbine control device comprising:
(Expression 2)
The steam control valve control unit calculates a target opening of the steam control valve based on the differential pressure ratio, calculates a basic operation amount for adjusting the opening of the steam control valve to the target opening, An operation amount of the steam control valve opening is calculated by calculating a correction amount of the steam control valve opening based on a value obtained by multiplying the output difference by a predetermined ratio, and adding the correction amount to the basic operation amount. To calculate,
The turbine control device according to expression 1.
(Expression 3)
The steam control valve control unit calculates the basic operation amount by subtracting the target opening from the opening of the steam control valve, and calculates the output difference by subtracting the reference output from the measurement output. , Decrease the opening of the steam control valve by the manipulated variable,
The turbine control device according to expression 2.
(Expression 4)
The steam control valve control unit stores the relationship between the differential pressure ratio and the target opening, and uses the relationship to calculate the target opening according to the differential pressure ratio.
The turbine control device according to expression 3.
(Expression 5)
The reference output storage unit acquires the measurement output according to an instruction of the valve switching control and stores it as the reference output.
The turbine control device according to expression 4.
(Expression 6)
The steam control valve control unit limits a range of the correction amount based on the basic operation amount.
The turbine control device according to expression 5.
(Expression 7)
The main steam stop valve has a main steam stop small valve that adjusts the opening of a part of the main steam stop valve,
A main steam stop valve control unit for controlling an opening degree of the main steam stop small valve based on the output difference;
The turbine control device according to expression 6.
(Expression 8)
The main steam stop valve control unit increases the opening of the main steam stop small valve according to an increase in the absolute value of the output difference when the output difference is smaller than a predetermined output difference threshold value of 0 or less.
The turbine control device according to expression 7.
(Expression 9)
Stores the reference output, which is the reference value of the output of the generator connected to the turbine,
The main steam stop valve and the main steam stop valve are throttled with respect to a main steam stop valve that adjusts the amount of steam flowing from the boiler and a steam control valve that controls the amount of steam that passes through the main steam stop valve and flows into the turbine. During valve switching control for opening a valve, a first pressure of steam before passing through the main steam stop valve and a second pressure of steam after passing through the main steam stop valve are acquired, and the first pressure And calculating the differential pressure ratio of the second pressure,
Obtaining a measurement output that is a measurement value of the output of the generator, calculating an output difference that is a difference between the reference output and the measurement output;
Based on the differential pressure ratio and the output difference, the degree of opening of the steam control valve is controlled.
A turbine control method comprising:

以上の表現における用語について説明する。基準出力記憶部は、保持器７１０等に対応する。出力差算出部は、減算器７２０等に対応する。蒸気加減弁制御部は、加減弁操作量算出部４２０、加減弁操作量補正部４４０等に対応する。主蒸気止め弁制御部は、主蒸気止め弁制御部４５０等に対応する。出力差は、発電機出力偏差等に対応する。第１操作量は、基本絞り込み量等に対応する。第２操作量は、補正量等に対応する。操作量は、絞り込み量等に対応する。差圧比と目標開度との関係は、関数６１１等に対応する。   The terms in the above expression will be described. The reference output storage unit corresponds to the holder 710 and the like. The output difference calculation unit corresponds to the subtracter 720 and the like. The steam control valve control unit corresponds to the control valve operation amount calculation unit 420, the control valve operation amount correction unit 440, and the like. The main steam stop valve control unit corresponds to the main steam stop valve control unit 450 and the like. The output difference corresponds to a generator output deviation or the like. The first operation amount corresponds to the basic narrowing amount and the like. The second operation amount corresponds to a correction amount or the like. The operation amount corresponds to the amount of narrowing down. The relationship between the differential pressure ratio and the target opening corresponds to the function 611 or the like.

本発明は、以上の実施例に限定されるものでなく、その趣旨から逸脱しない範囲で、他の様々な形に変更することができる。   The present invention is not limited to the above embodiments, and can be modified in various other forms without departing from the spirit of the present invention.

１００：ボイラ、 １１０：主蒸気止め弁前圧検出器、 １２０：主蒸気止め弁、 １３０：主蒸気止め弁後圧検出器、 １４０：蒸気加減弁、 ２００：タービン、 ３００：発電機、 ４００：タービン制御装置、 ４１０：差圧比算出部、 ４２０：加減弁操作量算出部、 ４３０：発電機出力偏差算出部、 ４４０：加減弁操作量補正部、 ４５０：主蒸気止め弁制御部、 ４６０：運転時制御部、 ４７０：全開操作量記憶部、 ４７０：弁操作量記憶部、 ５２０：切替器、 ５３０：切替器、 ５４０：弁切替開始判定部、 ５５０：弁切替完了判定部
100: Boiler, 110: Main steam stop valve pre-pressure detector, 120: Main steam stop valve, 130: Main steam stop valve post-pressure detector, 140: Steam control valve, 200: Turbine, 300: Generator, 400: Turbine controller, 410: differential pressure ratio calculation unit, 420: control valve operation amount calculation unit, 430: generator output deviation calculation unit, 440: control valve operation amount correction unit, 450: main steam stop valve control unit, 460: operation Time control unit, 470: fully open operation amount storage unit, 470: valve operation amount storage unit, 520: switching unit, 530: switching unit, 540: valve switching start determination unit, 550: valve switching completion determination unit

Claims (9)

タービンに接続されている発電機の出力の基準値である基準出力を記憶する基準出力記憶部と、
ボイラから流入する蒸気量を調節する主蒸気止め弁と、前記主蒸気止め弁を通り前記タービンへ流入する蒸気量を調節する蒸気加減弁とに対し、前記蒸気加減弁を絞ると共に前記主蒸気止め弁を開く弁切替制御中に、前記主蒸気止め弁を通過する前の蒸気の第１圧力と、前記主蒸気止め弁を通過した後の蒸気の第２圧力とを取得し、前記第１圧力及び前記第２圧力の差圧比を算出する差圧比算出部と、
前記発電機の出力の測定値である測定出力を取得し、前記基準出力及び前記測定出力の差である出力差を算出する出力差算出部と、
前記差圧比及び前記出力差に基づいて、前記蒸気加減弁の開度を制御する蒸気加減弁制御部と、
を備えるタービン制御装置。 A reference output storage unit that stores a reference output that is a reference value of the output of the generator connected to the turbine;
The main steam stop valve and the main steam stop valve are throttled with respect to a main steam stop valve that adjusts the amount of steam flowing from the boiler and a steam control valve that controls the amount of steam that passes through the main steam stop valve and flows into the turbine. During valve switching control for opening a valve, a first pressure of steam before passing through the main steam stop valve and a second pressure of steam after passing through the main steam stop valve are acquired, and the first pressure And a differential pressure ratio calculation unit for calculating a differential pressure ratio of the second pressure,
An output difference calculation unit that obtains a measurement output that is a measurement value of the output of the generator and calculates an output difference that is a difference between the reference output and the measurement output;
A steam control valve controller that controls the opening of the steam control valve based on the differential pressure ratio and the output difference;
A turbine control device comprising: 前記蒸気加減弁制御部は、前記差圧比に基づいて前記蒸気加減弁の目標開度を算出し、前記蒸気加減弁の開度を前記目標開度へ合わせるための基本操作量を算出し、前記出力差に所定の比率を乗じた値に基づいて前記蒸気加減弁の開度の補正量を算出し、前記基本操作量に前記補正量を加えることにより、前記蒸気加減弁の開度の操作量を算出する、
請求項１に記載のタービン制御装置。 The steam control valve control unit calculates a target opening of the steam control valve based on the differential pressure ratio, calculates a basic operation amount for adjusting the opening of the steam control valve to the target opening, An operation amount of the steam control valve opening is calculated by calculating a correction amount of the steam control valve opening based on a value obtained by multiplying the output difference by a predetermined ratio, and adding the correction amount to the basic operation amount. To calculate,
The turbine control device according to claim 1. 前記蒸気加減弁制御部は、前記蒸気加減弁の開度から前記目標開度を減ずることにより、前記基本操作量を算出し、前記測定出力から前記基準出力を減ずることにより前記出力差を算出し、前記蒸気加減弁の開度を前記操作量だけ減少させる、
請求項２に記載のタービン制御装置。 The steam control valve control unit calculates the basic operation amount by subtracting the target opening from the opening of the steam control valve, and calculates the output difference by subtracting the reference output from the measurement output. , Decrease the opening of the steam control valve by the manipulated variable,
The turbine control device according to claim 2. 前記蒸気加減弁制御部は、前記差圧比と前記目標開度との関係を記憶し、前記関係を用いて、前記差圧比に応じた前記目標開度を算出する、
請求項３に記載のタービン制御装置。 The steam control valve control unit stores the relationship between the differential pressure ratio and the target opening, and uses the relationship to calculate the target opening according to the differential pressure ratio.
The turbine control device according to claim 3. 前記基準出力記憶部は、前記弁切替制御の指示に応じて前記測定出力を取得し前記基準出力として記憶する、
請求項４に記載のタービン制御装置。 The reference output storage unit acquires the measurement output according to an instruction of the valve switching control and stores it as the reference output.
The turbine control device according to claim 4. 前記蒸気加減弁制御部は、前記基本操作量に基づいて前記補正量の範囲を制限する、
請求項５に記載のタービン制御装置。 The steam control valve control unit limits a range of the correction amount based on the basic operation amount.
The turbine control device according to claim 5. 前記主蒸気止め弁は、前記主蒸気止め弁の一部の開度を調節する主蒸気止め小弁を有し、
前記出力差に基づいて前記主蒸気止め小弁の開度を制御する主蒸気止め弁制御部を、更に備える、
請求項６に記載のタービン制御装置。 The main steam stop valve has a main steam stop small valve that adjusts the opening of a part of the main steam stop valve,
A main steam stop valve control unit for controlling an opening degree of the main steam stop small valve based on the output difference;
The turbine control device according to claim 6. 前記主蒸気止め弁制御部は、前記出力差が所定の０以下の出力差閾値より小さい場合に、前記出力差の絶対値の増大に応じて前記主蒸気止め小弁の開度を増大させる、
請求項７に記載のタービン制御装置。 The main steam stop valve control unit increases the opening of the main steam stop small valve according to an increase in the absolute value of the output difference when the output difference is smaller than a predetermined output difference threshold value of 0 or less.
The turbine control device according to claim 7. タービンに接続されている発電機の出力の基準値である基準出力を記憶し、
ボイラから流入する蒸気量を調節する主蒸気止め弁と、前記主蒸気止め弁を通り前記タービンへ流入する蒸気量を調節する蒸気加減弁とに対し、前記蒸気加減弁を絞ると共に前記主蒸気止め弁を開く弁切替制御中に、前記主蒸気止め弁を通過する前の蒸気の第１圧力と、前記主蒸気止め弁を通過した後の蒸気の第２圧力とを取得し、前記第１圧力及び前記第２圧力の差圧比を算出し、
前記発電機の出力の測定値である測定出力を取得し、前記基準出力及び前記測定出力の差である出力差を算出し、
前記差圧比及び前記出力差に基づいて、前記蒸気加減弁の開度を制御する、
ことを備えるタービン制御方法。
Stores the reference output, which is the reference value of the output of the generator connected to the turbine,
The main steam stop valve and the main steam stop valve are throttled with respect to a main steam stop valve that adjusts the amount of steam flowing from the boiler and a steam control valve that controls the amount of steam that passes through the main steam stop valve and flows into the turbine. During valve switching control for opening a valve, a first pressure of steam before passing through the main steam stop valve and a second pressure of steam after passing through the main steam stop valve are acquired, and the first pressure And calculating the differential pressure ratio of the second pressure,
Obtaining a measurement output that is a measurement value of the output of the generator, calculating an output difference that is a difference between the reference output and the measurement output;
Based on the differential pressure ratio and the output difference, the degree of opening of the steam control valve is controlled.
A turbine control method comprising:
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