JPH07103808B2 - Load back-up method when the system frequency drops sharply - Google Patents
Load back-up method when the system frequency drops sharplyInfo
- Publication number
- JPH07103808B2 JPH07103808B2 JP61135176A JP13517686A JPH07103808B2 JP H07103808 B2 JPH07103808 B2 JP H07103808B2 JP 61135176 A JP61135176 A JP 61135176A JP 13517686 A JP13517686 A JP 13517686A JP H07103808 B2 JPH07103808 B2 JP H07103808B2
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- turbine
- system frequency
- power generation
- load
- 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.)
- Expired - Fee Related
Links
Landscapes
- Control Of Turbines (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は抽気タービン全般に適用される系統周波数急減
時の負荷バックアップ方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a load backup method applied to an extraction turbine in general when the system frequency suddenly decreases.
［従来の技術］ 従来から、タービン発電機により構成される発電系統に
おいて、その系統周波数低減時の負荷上昇対策としては
第５図に示すように、周波数検出器１にて検出された系
統周波数と，周波数設定器２にて設定された周波数設定
値とを減算器３に導入し、両者の周波数偏差に応じてMW
DEMAND（発電量指令）を補正し、GOVERNER弁開度およ
びBOILER MASTERを上昇させることにより、負荷を緩や
かに上昇させて系統周波数の安定化を図る方法が採られ
ている。なお第５図において、４は負荷設定器、５は負
荷変化率設定器、６は負荷上下限設定器、７は変化率制
限器、８は加算器、９は上下限制限器、10は発電機出力
検出器、11は主蒸気圧力検出器、12は減算器、13は制御
器、14は減算器、15は関数発生器、16は制御器、17は加
算器を夫々示すものである。[Prior Art] Conventionally, in a power generation system including a turbine generator, as a load increase countermeasure when the system frequency is reduced, as shown in FIG. , The frequency setting value set by the frequency setting device 2 is introduced into the subtractor 3, and the MW is adjusted according to the frequency deviation between the two.
The DEMAND (power generation command) is corrected, and the GOVERNER valve opening and BOILER MASTER are increased to gradually increase the load and stabilize the system frequency. In FIG. 5, 4 is a load setter, 5 is a load change rate setter, 6 is a load upper / lower limit setter, 7 is a change rate limiter, 8 is an adder, 9 is an upper / lower limit limiter, and 10 is power generation. A machine output detector, 11 is a main steam pressure detector, 12 is a subtractor, 13 is a controller, 14 is a subtractor, 15 is a function generator, 16 is a controller, and 17 is an adder.
［発明が解決しようとする問題点］ ところで、上述した従来のような系統周波数低減時の負
荷上昇対策方法においては、次のような問題があった。
すなわち、特に低開発国や開発途上国では，一発電系統
当りの発電量が少ないことから系統周波数の急減が激し
く、かかる系統周波数の低減時にはプラント効率を無視
してでも，発電量を増加させて系統周波数の安定維持を
図るようにすることが要求される。しかしながら、上述
した従来のような系統周波数の安定化方法では、系統周
波数の急減に対応することが非常に困難である。[Problems to be Solved by the Invention] By the way, the above-described conventional load increase countermeasure method at the time of system frequency reduction has the following problems.
That is, especially in low-developed countries and developing countries, the amount of power generation per power generation system is small, so that the system frequency sharply decreases. When reducing the system frequency, even if the plant efficiency is ignored, the amount of power generation can be increased. It is required to maintain a stable system frequency. However, it is very difficult to cope with the sudden decrease of the system frequency by the conventional method of stabilizing the system frequency as described above.
そこで本発明では、系統周波数の急減に対し，発電のた
めの主蒸気量を直接的に増加させて系統周波数を速やか
に回復し系統周波数の安定維持を図ることが可能な系統
周波数急減時の負荷バックアップ方法を提供することを
目的とする。Therefore, in the present invention, in response to a sudden decrease in the system frequency, the load at the time of the sudden decrease in the system frequency can be directly increased by directly increasing the amount of main steam for power generation and the system frequency can be stably maintained. The purpose is to provide a backup method.
［問題点を解決するための手段］ 上記の目的を達成するために本発明では、タービン抽気
蒸気止弁を備えたタービン発電機により構成される発電
系統における系統周波数急減時の負荷バックアップ方法
において、発電系統の周波数が急減して周波数設定値よ
りも低くなった際に、タービン抽気蒸気止弁を閉方向に
動作させて全閉または半開し、タービン通過蒸気量を増
加させるようにする。[Means for Solving the Problems] In order to achieve the above object, the present invention provides a load backup method at the time of a sudden decrease in system frequency in a power generation system configured by a turbine generator including a turbine extraction steam stop valve, When the frequency of the power generation system suddenly decreases and becomes lower than the frequency setting value, the turbine extraction steam stop valve is operated in the closing direction to be fully closed or half opened to increase the steam passing through the turbine.
［作用］ 上述の方法においては、系統周波数の急減時に，タービ
ン抽気蒸気止弁を半開または全閉させることにより，発
電に直接寄与していないタービン抽気は減少または無く
なり、その分の蒸気が発電に寄与するようになることか
ら、発電機出力がその分だけ上昇して系統周波数が回復
することになる。[Operation] In the above method, when the system extraction frequency is suddenly reduced, the turbine extraction steam stop valve is half-opened or fully closed, so that the turbine extraction air that does not directly contribute to the power generation is reduced or eliminated, and the steam corresponding to the steam extraction is generated. Since it contributes, the generator output rises by that amount and the system frequency is recovered.
［実施例］ 以下、本発明の一実施例について図面を参照して説明す
る。[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.
第１図は、本発明による系統周波数急減時の負荷バック
アップ方法を実現するためのHP抽気蒸気止弁制御回路を
示す構成図、第２図は同方法を適用するためのBTG複合
制御系統を示す構成図である。第１図において、18は系
統周波数を検出する周波数検出器、19は周波数設定値を
設定する周波数設定器、20は周波数検出器18にて検出さ
れた系統周波数と、周波数設定器19にて設定された周波
数設定値とを導入し，系統周波数が周波数設定値よりも
低くなると動作するモニタ−SWである。また、NOTはノ
ット回路、ANDはアンド回路、ORはオア回路であり、夫
々図示のように組合わせ構成されて、第２図におけるHP
抽気蒸気止弁に対する開指令Ａあるいは閉指令Ｂを出力
するようになっている。なお、LP抽気蒸気止弁制御回路
についても上述と同様に構成されている。FIG. 1 is a block diagram showing an HP extraction steam stop valve control circuit for realizing a load backup method at the time of a sudden decrease in system frequency according to the present invention, and FIG. 2 shows a BTG combined control system for applying the method. It is a block diagram. In FIG. 1, 18 is a frequency detector that detects the system frequency, 19 is a frequency setter that sets the frequency set value, 20 is the system frequency detected by the frequency detector 18, and is set by the frequency setter 19. This is a monitor-SW that operates when the system frequency becomes lower than the frequency setting value by introducing the specified frequency setting value. Further, NOT is a knot circuit, AND is an AND circuit, and OR is an OR circuit, which are respectively combined as shown in FIG.
An opening command A or a closing command B for the extraction steam stop valve is output. The LP extraction steam stop valve control circuit is also configured in the same manner as above.
次に、かかる構成に基づく負荷バックアップ方法につい
て述べる。Next, a load backup method based on such a configuration will be described.
まず、通常運転中（系統周波数が安定している時）には
プラント全体の効率を優先するため、タービン抽気蒸気
止弁は全開で各ヒーターに抽気蒸気を送り、ヒーターに
て給水の温度を上昇させることに抽気蒸気が使用されて
いる。First, during normal operation (when the system frequency is stable), to prioritize the efficiency of the entire plant, the turbine extraction steam stop valve is fully opened to send extraction steam to each heater, and the heater raises the temperature of the feed water. Bleed steam is used to make it happen.
次に、このような状態から系統周波数が急減し、周波数
検出器18にて検出される系統周波数の値が周波数設定器
19にて設定された周波数設定値よりも低くなると、これ
を検出してモニターSWが動作する。そしてこの時、抽気
蒸気止弁制御用CSを自動位置に入れておくことにより、
所定の論理条件が成立してHP抽気蒸気止弁に対し，閉指
令Ｂが出力されてHP抽気蒸気止弁が全閉または半開し、
タービン抽気蒸気が発電に直接寄与する主蒸気に割当て
られる。これにより、発電に寄与する主蒸気量が増加し
て系統の発電量（負荷）がその分だけ増加するため、系
統周波数の低減が防止されることになる。（この期間
は、タービン抽気蒸気量が減少するため、ヒーターは未
使用またはそれに近い状態となってプラント効率は低下
するが、系統の発電量は増加する。） 第３図はボイラMCR（840T/H蒸発量）時の通常運転中の
タービンのヒートバランスを示すものであり、また第４
図はボイラMCR（840T/H蒸発量）時のタービン抽気蒸気
止弁１台のみ全閉（No.6ヒーターカット）にした時のヒ
ートバランスを示すものである。第３図においては、負
荷は263.7MWであるが、第４図に示す如くタービン抽気
蒸気止弁１台のみの全閉によって負荷は275MWとなり、
約11.3MW（約4.2％）の負荷上昇となる。なお、タービ
ン抽気蒸気止弁はこの場合５台あり、これらの組合せ使
用によってより多くの負荷上昇を行なうことが可能であ
る。Next, the system frequency suddenly decreases from such a state, and the value of the system frequency detected by the frequency detector 18 becomes the frequency setter.
When it becomes lower than the frequency set value set in 19, the monitor SW operates by detecting this. And at this time, by putting the extraction steam control valve control CS in the automatic position,
When a predetermined logical condition is satisfied and a close command B is output to the HP extraction steam stop valve, the HP extraction steam stop valve is fully closed or half-opened,
Turbine extraction steam is assigned to the main steam that directly contributes to power generation. As a result, the amount of main steam that contributes to power generation increases, and the amount of power generation (load) in the system increases by that amount, so that reduction of the system frequency is prevented. (During this period, the amount of steam extracted from the turbine decreases, so the heater becomes unused or close to it, and the plant efficiency decreases, but the amount of power generation in the system increases.) Figure 3 shows the boiler MCR (840T / 840T / H vaporization amount) shows the heat balance of the turbine during normal operation.
The figure shows the heat balance when only one turbine extraction steam stop valve is fully closed (No.6 heater cut) at boiler MCR (840T / H evaporation). In Fig. 3, the load is 263.7 MW, but as shown in Fig. 4, the load becomes 275 MW by fully closing only one turbine extraction steam stop valve.
The load will increase by about 11.3 MW (about 4.2%). In this case, there are five turbine extraction steam stop valves, and it is possible to increase the load more by combining these.
上述したように、タービン抽気蒸気止弁を備えたタービ
ン発電機により構成される発電系統において、発電系統
の周波数が急減して周波数設定値よりも低くなった際
に、タービン抽気蒸気止弁を閉方向に動作させて全閉ま
たは半開し、タービン通過蒸気量を増加させるようにし
たので、系統周波数の急減に対し，発電のための主蒸気
量を直接的に増加させて系統周波数を速やかに回復して
系統周波数の安定維持を図ることが可能となる。従っ
て、特に低開発国や開発途上国では，一発電系統当りの
発電量が少ないことから系統周波数の急減が激しく、か
かる系統周波数の低減時にはプラント効率を無視してで
も，発電量を増加させて系統周波数の安定維持を図るよ
うにすることが要求されるが、上述したような系統周波
数の安定化方法とすることにより、系統周波数の急減に
容易に対応できることになる。As described above, in a power generation system configured by a turbine generator equipped with a turbine extraction steam stop valve, the turbine extraction steam stop valve is closed when the frequency of the generation system drops sharply and becomes lower than the frequency set value. By operating in the direction to fully close or half-open to increase the turbine passing steam amount, the main steam amount for power generation is directly increased to quickly recover the system frequency against the sudden decrease in the system frequency. By doing so, it becomes possible to maintain a stable system frequency. Therefore, especially in underdeveloped countries and developing countries, the amount of power generation per power generation system is small, so that the system frequency sharply decreases. When such system frequency is reduced, the amount of power generation can be increased even if the plant efficiency is ignored. Although it is required to keep the system frequency stable, the system frequency stabilizing method as described above can easily cope with a sudden decrease in the system frequency.
［発明の効果］ 以上説明したように本発明によれば、タービン抽気蒸気
止弁を備えたタービン発電機により構成される発電系統
における系統周波数急減時の負荷バックアップ方法にお
いて、発電系統の周波数が急減して周波数設定値よりも
低くなった際に、タービン抽気蒸気止弁を閉方向に動作
させて全閉または半開し、タービン通過蒸気量を増加さ
せるようにしたので、系統周波数の急減に対し，発電の
ための主蒸気量を直接的に増加させて系統周波数を速や
かに回復し系統周波数の安定維持を図ることが可能な系
統周波数急減時の負荷バックアップ方法が提供できる。[Advantages of the Invention] As described above, according to the present invention, in the load backup method at the time of the system frequency sudden decrease in the power generation system configured by the turbine generator having the turbine extraction steam stop valve, the frequency of the power generation system is rapidly decreased Then, when it becomes lower than the frequency set value, the turbine extraction steam stop valve is operated in the closing direction to fully close or half open and increase the steam passing through the turbine. It is possible to provide a load backup method at the time of a sudden decrease in the system frequency, which can directly increase the amount of main steam for power generation to quickly recover the system frequency and maintain stable system frequency.
第１図は本発明による系統周波数急減時の負荷バックア
ップ方法を実現するための抽気蒸気止弁制御回路の構成
図、第２図は同方法を適用するためのBTG複合制御系統
を示す構成図、第３図は通常運転時のタービンのヒート
バランスを示す図、第４図は周波数低減時等によりター
ビン抽気蒸気止弁を１台のみ全閉にした時のヒートバラ
ンスを示す図、第５図は従来の周波数低減対策回路を示
す構成図である。 １…周波数検出器、２…周波数設定器、３…減算器、４
…負荷設定器、５…負荷変化率設定器、６…負荷上下限
設定器、７…変化率制限器、８…加算器、９…上下限制
限器、10…発電機出力検出器、11…主蒸気圧力検出器、
12…減算器、13…制御器、14…減算器、15…関数発生
器、16…制御器、17…加算器、18…周波数検出器、19…
周波数設定器、20…モニターSW、NOT…ノット回路、AND
…アンド回路、OR…オア回路。FIG. 1 is a block diagram of a bleed steam control valve control circuit for realizing a load backup method at the time of a sudden decrease in system frequency according to the present invention, and FIG. 2 is a block diagram showing a BTG combined control system for applying the same method. FIG. 3 is a diagram showing the heat balance of the turbine during normal operation, FIG. 4 is a diagram showing the heat balance when only one turbine extraction steam stop valve is fully closed due to frequency reduction, and FIG. It is a block diagram which shows the conventional frequency reduction countermeasure circuit. 1 ... Frequency detector, 2 ... Frequency setting device, 3 ... Subtractor, 4
... load setter, 5 ... load change rate setter, 6 ... load upper / lower limit setter, 7 ... change rate limiter, 8 ... adder, 9 ... upper / lower limit limiter, 10 ... generator output detector, 11 ... Main steam pressure detector,
12 ... Subtractor, 13 ... Controller, 14 ... Subtractor, 15 ... Function generator, 16 ... Controller, 17 ... Adder, 18 ... Frequency detector, 19 ...
Frequency setter, 20 ... Monitor SW, NOT ... Knot circuit, AND
… And circuit, OR… or circuit.
Claims (1)
電機により構成される発電系統における系統周波数急減
時の負荷バックアップ方法において、 前記発電系統の周波数が急減して周波数設定値よりも低
くなった際に、前記タービン抽気蒸気止弁を閉方向に動
作させて全閉または半開し、タービン通過蒸気量を増加
させるようにしたことを特徴とする系統周波数急減時の
負荷バックアップ方法。1. A load backup method at the time of a sudden decrease in the system frequency in a power generation system composed of a turbine generator equipped with a turbine extraction steam stop valve, wherein the frequency of the power generation system sharply decreases and becomes lower than a frequency set value. At this time, the turbine backup steam stop valve is operated in the closing direction to be fully closed or half opened to increase the amount of steam passing through the turbine, thereby increasing the amount of steam passing through the turbine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61135176A JPH07103808B2 (en) | 1986-06-11 | 1986-06-11 | Load back-up method when the system frequency drops sharply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61135176A JPH07103808B2 (en) | 1986-06-11 | 1986-06-11 | Load back-up method when the system frequency drops sharply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62291402A JPS62291402A (en) | 1987-12-18 |
| JPH07103808B2 true JPH07103808B2 (en) | 1995-11-08 |
Family
ID=15145610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61135176A Expired - Fee Related JPH07103808B2 (en) | 1986-06-11 | 1986-06-11 | Load back-up method when the system frequency drops sharply |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07103808B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2838124B2 (en) * | 1988-09-29 | 1998-12-16 | 文化シヤッター 株式会社 | Shutter opening and closing device |
| JP2002030904A (en) * | 2000-05-09 | 2002-01-31 | Yyl:Kk | Power generating device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5723085A (en) * | 1980-07-15 | 1982-02-06 | Asahi Glass Co Ltd | Fitting method for ion exchange membrane |
-
1986
- 1986-06-11 JP JP61135176A patent/JPH07103808B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62291402A (en) | 1987-12-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |