JPH0874782A - Feed pump flow rate control device - Google Patents
Feed pump flow rate control deviceInfo
- Publication number
- JPH0874782A JPH0874782A JP23074194A JP23074194A JPH0874782A JP H0874782 A JPH0874782 A JP H0874782A JP 23074194 A JP23074194 A JP 23074194A JP 23074194 A JP23074194 A JP 23074194A JP H0874782 A JPH0874782 A JP H0874782A
- Authority
- JP
- Japan
- Prior art keywords
- flow rate
- water supply
- supply pump
- control device
- feed pump
- 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.)
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- Control Of Non-Positive-Displacement Pumps (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は発電プラント等で使用す
るの給水ポンプ流量制御装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water supply pump flow control device used in a power plant or the like.
【０００２】[0002]
【従来の技術】発電プラントにおける給水ポンプ系統の
一例を図４に示す。図４において、給水ポンプ１は給水
ポンプ流量制御装置２から出力される回転数指令ＮS に
よって回転数を変化させ、それによりボイラへの給水流
量を変化させる。給水ポンプ流量制御装置２は流量検出
器３により得られる流量Ｑを入力し、図示しないボイラ
制御装置から入力する流量設定値に一致するよう給水ポ
ンプ１に回転数指令ＮSを出力する構成となっている。2. Description of the Related Art An example of a water supply pump system in a power plant is shown in FIG. In FIG. 4, the water supply pump 1 changes the rotation speed according to the rotation speed command N S output from the water supply pump flow rate control device 2, thereby changing the water supply flow rate to the boiler. The feed water pump flow rate control device 2 is configured to input the flow rate Q obtained by the flow rate detector 3 and output a rotation speed command N S to the feed water pump 1 so as to match the flow rate set value input from a boiler control device (not shown). ing.
【０００３】圧力検出器４は給水ポンプ１の圧力を検出
している。給水ポンプ流量制御装置２の制御ブロック図
を図５に示す。図５に示されるように流量検出器３によ
り得られる流量Ｑと流量設定値ＱS とを偏差演算器５に
入力し、その出力を比例積分演算器６に入力し、その出
力の回転数指令ＮS を給水ポンプ１に出力する。The pressure detector 4 detects the pressure of the water supply pump 1. FIG. 5 shows a control block diagram of the water supply pump flow rate control device 2. As shown in FIG. 5, the flow rate Q and the flow rate setting value Q S obtained by the flow rate detector 3 are input to the deviation calculator 5, the output thereof is input to the proportional-plus-integral calculator 6, and the rotation speed command of the output is input. Output N S to feed pump 1.
【０００４】[0004]
【発明が解決しようとする課題】従来技術の第１の問題
点を図６を用いて説明する。図６は給水ポンプの流量−
圧力特性を表した図である。図中の実線はある回転数ｎ
における流量−圧力特性を表し、ｎ1 からｎ6 にかけて
回転数がΔｎずつ増加している。又、図中の破線は発電
プラントの運用による給水ポンプの運転点を表し、低流
量域では圧力がほぼ一定であるが高流量域では流量の増
加とともに圧力が増加するようになる。但し、給水ポン
プの起動停止時にはこの破線以外の点で運転されること
になる。The first problem of the prior art will be described with reference to FIG. Figure 6 shows the flow rate of the water supply pump-
It is a figure showing the pressure characteristic. The solid line in the figure indicates a certain rotation speed n
Represents the flow rate-pressure characteristics in the graph, and the rotation speed increases by Δn from n 1 to n 6 . Also, the broken line in the figure represents the operating point of the water supply pump by the operation of the power generation plant, where the pressure is almost constant in the low flow rate region, but increases in the high flow rate region as the flow rate increases. However, when starting and stopping the water supply pump, it will be operated at a point other than this broken line.
【０００５】例として、高流量域の運転点Ａと低流量域
の運転点Ｂとの間の回転数−流量特性の違いを説明す
る。運転点Ａにおける回転数−流量特性はＱA ／２Δｎ
であり、運転点Ｂにおける回転数−流量特性はＱB ／２
Δｎである。図より明らかなように、運転点Ｂにおける
回転数−流量特性の値は運転点Ａより大きい。As an example, the difference in the rotational speed-flow rate characteristics between the operating point A in the high flow rate range and the operating point B in the low flow rate range will be described. The rotation speed-flow rate characteristic at the operating point A is Q A / 2Δn
And the rotational speed-flow rate characteristic at the operating point B is Q B / 2
Δn. As is apparent from the figure, the value of the rotational speed-flow rate characteristic at the operating point B is larger than that at the operating point A.
【０００６】この違いが前記制御器の制御定数を決定す
る上での問題となる。即ち、運転点Ａで最適となるよう
な制御定数を決定すると、運転点Ｂでは給水ポンプの回
転数−流量特性の値が大きいことから、その制御定数で
は振動気味の制御特性となり好ましくない。その逆に、
運転点Ｂでの最適な制御定数では運転点Ａでは制御特性
が遅くなる。This difference becomes a problem in determining the control constant of the controller. That is, if the optimum control constant is determined at the operating point A, the value of the rotational speed-flow rate characteristic of the water supply pump is large at the operating point B, so that the control constant causes a vibration-like control characteristic, which is not preferable. On the contrary,
With the optimum control constant at the operating point B, the control characteristic becomes slower at the operating point A.
【０００７】従来技術の第２の問題点を図７を用いて説
明する。図７は給水ポンプの流量設定値をランプ状に変
化させたときの給水流量（図７(b) ）と、給水ポンプ回
転数（図７(a) ）の時間的変化を表した図である。図中
の実線は給水ポンプの流量Ｑ、破線は流量設定値ＱS 、
一点鎖線は回転数指令ＮS を表す。The second problem of the prior art will be described with reference to FIG. FIG. 7 is a diagram showing temporal changes in the water supply flow rate (FIG. 7 (b)) and the water supply pump rotation speed (FIG. 7 (a)) when the flow rate setting value of the water supply pump is changed in a ramp shape. . The solid line in the figure is the flow rate Q of the water supply pump, the broken line is the flow rate set value Q S ,
The alternate long and short dash line represents the rotation speed command N S.
【０００８】比例積分演算器６はその特徴として、流量
設定値ＱS をランプ状に変化させたときには、給水ポン
プの回転数指令ＮS の変化は遅れを持つ。しかし、この
遅れを改善させるような比例積分演算器６の制御定数を
決定すると、振動気味の制御特性となり好ましくない。A characteristic of the proportional-plus-integral calculator 6 is that, when the flow rate set value Q S is changed in a ramp shape, the change in the rotational speed command N S of the water supply pump has a delay. However, if the control constant of the proportional-plus-integral calculator 6 that improves the delay is determined, the control characteristic tends to vibrate, which is not preferable.
【０００９】本発明は上記課題を解決するためになされ
たものであり、給水ポンプのいかなる運転点においても
流量制御特性を同じにし、給水ポンプの流量設定値の変
化に対する制御の追従性を向上させる給水ポンプ流量制
御装置を提供することを目的としている。The present invention has been made to solve the above problems, and makes the flow rate control characteristics the same at any operating point of the water feed pump to improve control followability with respect to changes in the flow rate set value of the water feed pump. It is an object of the present invention to provide a water supply pump flow control device.
【００１０】[0010]
【課題を解決するための手段】本発明の［請求項１］に
係る給水ポンプ流量制御装置は、給水ポンプの流量設定
値と、給水ポンプの流量の検出器とを備え、給水ポンプ
流量と前記流量設定値との偏差を演算し、その偏差を零
とするように給水ポンプ回転数指令を発生させる制御手
段を備えた給水ポンプ流量制御装置において、給水ポン
プの流量−圧力特性式から導かれる回転数−流量特性発
生器と、前記回転数−流量特性発生器から出力される回
転数−流量ゲインを前記給水ポンプ流量と流量設定値と
の偏差に乗じる乗算器とを設けるようにしたものであ
る。A water supply pump flow rate control device according to a first aspect of the present invention comprises a water supply pump flow rate set value and a detector for the water supply pump flow rate, and the water supply pump flow rate and In a water supply pump flow rate control device having a control means for calculating a deviation from a flow rate set value and generating a water supply pump rotation speed command so that the deviation becomes zero, a rotation derived from a flow rate-pressure characteristic equation of the water supply pump A number-flow rate characteristic generator and a multiplier for multiplying the deviation between the feedwater pump flow rate and the flow rate set value by the rotation rate-flow rate gain output from the rotation rate-flow rate characteristic generator are provided. .
【００１１】本発明の［請求項２］に係る給水ポンプ流
量制御装置は、給水ポンプの流量設定値と、給水ポンプ
の流量の検出器とを備え、給水ポンプ流量と前記流量設
定値との偏差を演算し、その偏差を零とするように給水
ポンプ回転数指令を発生させる制御手段を備えた給水ポ
ンプ流量制御装置において、給水ポンプの流量−圧力特
性式から導かれる流量−回転数特性発生器と、前記流量
−回転数特性発生器から出力される回転数を前記給水ポ
ンプ回転数指令に加える加算器とを設けるようにしたも
のである。A water supply pump flow rate control device according to a second aspect of the present invention comprises a flow rate set value of the water supply pump and a detector of the flow rate of the water supply pump, and a deviation between the water supply pump flow rate and the flow rate set value. In a feed water pump flow rate control device having a control means for generating a feed water pump rotation speed command so as to make the deviation zero, a flow rate-rotation speed characteristic generator derived from a flow rate-pressure characteristic equation of the water feed pump. And an adder for adding the rotation speed output from the flow rate-rotation speed characteristic generator to the feed water pump rotation speed command.
【００１２】[0012]
【作用】本発明の「請求項１］に係る給水ポンプ流量制
御装置は、回転数−流量特性発生器が、給水ポンプが高
流量域の運転点にある場合には小さな値を、低流量域の
運転点にある場合には大きな値を出力する。これにより
給水ポンプのいかなる運転点においても流量制御特性を
同じにすることができる。In the feed water pump flow rate control device according to the first aspect of the present invention, the rotation speed-flow rate characteristic generator outputs a small value when the feed water pump is at the operating point in the high flow rate range, and a low flow rate range. A large value is output when the operating point is set to 1. Therefore, the flow rate control characteristic can be the same at any operating point of the feed pump.
【００１３】本発明の［請求項２］に係る給水ポンプ流
量制御装置は、流量−回転数特性発生器が、給水ポンプ
の流量設定値に対応する給水ポンプ回転数指令を出力す
る。これを回転数指令の先行制御に使用し、給水ポンプ
の流量設定値の変化に対する制御の追従性を向上するこ
とができる。In the water supply pump flow rate control device according to [Claim 2] of the present invention, the flow rate-rotation speed characteristic generator outputs the water supply pump rotation speed command corresponding to the flow rate set value of the water supply pump. This can be used for the advance control of the rotation speed command, and the followability of the control with respect to the change of the flow rate set value of the water supply pump can be improved.
【００１４】[0014]
【実施例】以下図面を参照して実施例を説明する。図１
は本発明の［請求項１］に係る給水ポンプ流量制御装置
の一実施例の制御ブロック図である。図１において、図
５と同一符号は同一部分を示し、図５と異なる点は、回
転数−流量特性発生器７，乗算器８からなる破線で囲ん
だ部分を追加している点である。回転数−流量特性発生
器７の一例について説明する。給水ポンプのＰ−Ｑ特性
は(1) の近似式で表される。ここでＰは圧力、Ｎは回転
数、Ｑは流量を表し、α，βは係数を表す。Embodiments will be described below with reference to the drawings. FIG.
FIG. 3 is a control block diagram of an embodiment of a water supply pump flow rate control device according to [Claim 1] of the present invention. In FIG. 1, the same reference numerals as those in FIG. 5 indicate the same parts, and the difference from FIG. 5 is that a part surrounded by a broken line composed of the rotation speed-flow rate characteristic generator 7 and the multiplier 8 is added. An example of the rotation speed-flow rate characteristic generator 7 will be described. The PQ characteristic of the water supply pump is expressed by the approximate expression (1). Here, P represents pressure, N represents rotation speed, Q represents flow rate, and α and β represent coefficients.
【００１５】[0015]
【数１】 Ｐ＝αＮ2 −βＱ2 ……………………(1) これを変形すると、回転数−流量特性は(2) 式で表され
る。 Ｎ＝｛（βＱ2 ＋Ｐ）／α｝1/2 ………………(2) これをＱで微分すると(3) 式となる。 ｆ（Ｑ，Ｐ）＝ｄＮ／ｄＱ ＝βＱ／｛α（βＱ2 ＋Ｐ）｝1/2 ……(3) [Equation 1] P = αN 2 −βQ 2 …………………… (1) When this is modified, the rotation speed-flow rate characteristic is expressed by equation (2). N = {(βQ 2 + P) / α} 1/2 ………… (2) Differentiating this by Q yields equation (3). f (Q, P) = dN / dQ = βQ / {α (βQ 2 + P)} 1/2 (3)
【００１６】(3) 式を回転数−流量特性発生器７とす
る。即ち、流量Ｑと圧力Ｐとを入力として回転数−流量
特性Ｘを出力する。回転数−流量特性Ｘと偏差演算器５
の出力とを乗算器８に入力し、２つの信号を乗算した結
果を比例積分演算器６に入力する。The equation (3) is used as the rotational speed-flow rate characteristic generator 7. That is, the flow rate Q and the pressure P are input and the rotation speed-flow rate characteristic X is output. Rotational speed-flow rate characteristic X and deviation calculator 5
And the output of are input to the multiplier 8, and the result of multiplying the two signals is input to the proportional-plus-integral calculator 6.
【００１７】回転数−流量特性Ｘを流量偏差に乗じるこ
とにより、回転数−流量特性の値が小さい高流量域では
比例積分演算器６の制御定数を上げることに相当し、低
流量域では制御定数を下げることに相当する。更に、回
転数−流量特性Ｘはすべての運転点において給水ポンプ
の流量に対する回転数の変化量を算出するため、すべて
の運転点において流量制御特性を同じにすることができ
る。By multiplying the flow rate deviation by the rotational speed-flow rate characteristic X, this is equivalent to increasing the control constant of the proportional-plus-integral calculator 6 in the high flow rate area where the value of the rotational speed-flow rate characteristic is small, and controlling in the low flow rate area. Equivalent to lowering the constant. Further, since the rotational speed-flow rate characteristic X calculates the amount of change in the rotational speed with respect to the flow rate of the water supply pump at all operating points, the flow rate control characteristics can be made the same at all operating points.
【００１８】図２は本発明の［請求項２］に係る給水ポ
ンプ流量制御装置の一実施例の制御ブロック図である。
図２において、図５と同一符号は同一部分を示し、図４
と異なる点は、流量−回転数発生器９と加算器10からな
る破線で囲んだ部分を追加している点である。回転数−
流量特性発生器９の一例について説明する。給水ポンプ
のＰ−Ｑ特性は前記(1) の近似式で表される。FIG. 2 is a control block diagram of an embodiment of the feed water pump flow rate control device according to [Claim 2] of the present invention.
2, the same reference numerals as those in FIG. 5 denote the same parts, and
3 is different from that in that a portion surrounded by a broken line, which includes the flow rate / rotation speed generator 9 and the adder 10, is added. Speed-
An example of the flow rate characteristic generator 9 will be described. The PQ characteristic of the water supply pump is expressed by the approximate expression (1).
【００１９】これを変形すると、回転数−流量特性は
(4) 式で表される。When this is modified, the rotational speed-flow rate characteristic becomes
It is expressed by equation (4).
【数２】 ｇ（Ｑ，Ｐ）＝Ｎ＝｛（βＱ2 ＋Ｐ）／α｝1/2 ………(4) (4) 式を流量−回転数特性発生器９とする。即ち、流量
Ｑと圧力Ｐとを入力として流量−回転数特性Ｙを出力す
る。流量−回転数特性Ｙを比例積分演算器６の出力に加
える。[Number 2] g (Q, P) = N = {(βQ 2 + P) / α} 1/2 ......... (4) (4) the flow rate equation - the rotational speed characteristic generator 9. That is, the flow rate Q and the pressure P are input, and the flow rate-rotational speed characteristic Y is output. The flow rate-rotational speed characteristic Y is added to the output of the proportional-plus-integral calculator 6.
【００２０】上記構成で給水ポンプの流量設定値をラン
プ状に変化させたときの給水流量，給水ポンプ回転数の
時間的変化を図３に表す。流量設定値ＱS が増加する
と、流量−回転数特性発生器９は流量設定値ＱS に相当
する回転数指令Ｙを出力し、この値が主体となって回転
数を増加させる。即ち、流量−回転数特性Ｙは立上り特
性の急峻な出力信号であるため、比例積分演算器の出力
と加算したとき、出力Ｙが最初にきいて、流量制御の先
行制御として使用することによって、流量設定値の変化
に対する制御の追従性を向上することができる。FIG. 3 shows the changes over time in the water supply flow rate and the water supply pump rotation speed when the flow rate set value of the water supply pump is changed in a ramp-like manner in the above configuration. When the flow rate setting value Q S increases, the flow rate-rotational speed characteristic generator 9 outputs a rotation speed command Y corresponding to the flow rate setting value Q S , and this value serves as a main component to increase the rotation speed. That is, since the flow rate-rotational speed characteristic Y is an output signal having a steep rising characteristic, when added to the output of the proportional-plus-integral calculator, the output Y comes first and is used as a preceding control of the flow rate control. It is possible to improve the controllability of control with respect to changes in the flow rate set value.
【００２１】[0021]
【発明の効果】以上説明したように、本発明の［請求項
１］に係る給水ポンプ流量制御装置によれば、給水ポン
プの運転点の違いによる回転数−流量特性の違いに対し
ても、回転数−流量特性発生器による特性補正により給
水ポンプのいかなる運転点においても、流量制御特性を
同じにすることが可能となる。As described above, according to the feed water pump flow rate control device according to the first aspect of the present invention, the difference in the rotational speed-flow rate characteristics due to the difference in the operating points of the water feed pump can be achieved. The flow rate control characteristic can be made the same at any operating point of the water supply pump by the characteristic correction by the rotational speed-flow rate characteristic generator.
【００２２】又、本発明の［請求項２］に係る給水ポン
プ流量制御装置によれば、流量−回転数特性発生器によ
る先行制御がきいて、流量設定値の変化に対する制御の
追従性を向上することができる。Further, according to the water supply pump flow rate control device according to the second aspect of the present invention, the advance control by the flow rate-rotation speed characteristic generator is enabled, and the followability of the control with respect to the change of the flow rate set value is improved. be able to.
【図１】本発明の［請求項１］に係る給水ポンプ流量制
御装置の一実施例の構成図。FIG. 1 is a configuration diagram of an embodiment of a water supply pump flow rate control device according to claim 1 of the present invention.
【図２】本発明の［請求項２］に係る給水ポンプ流量制
御装置の一実施例の構成図。FIG. 2 is a configuration diagram of an embodiment of a water supply pump flow rate control device according to [Claim 2] of the present invention.
【図３】図２の給水ポンプ流量制御装置による制御性説
明図。3 is an explanatory view of controllability by the water supply pump flow rate control device of FIG.
【図４】一般的な給水ポンプ系統の説明図。FIG. 4 is an explanatory diagram of a general water supply pump system.
【図５】従来の制御装置の構成図。FIG. 5 is a configuration diagram of a conventional control device.
【図６】給水ポンプの回転数，圧力，流量の特性説明
図。FIG. 6 is a characteristic explanatory view of the number of revolutions, pressure, and flow rate of the water supply pump.
【図７】図５の給水ポンプ流量制御装置による制御特性
説明図。7 is an explanatory view of control characteristics by the water supply pump flow rate control device of FIG.
１ 給水ポンプ ２ 給水ポンプ流量制御装置 ３ 流量検出器 ４ 圧力検出器 ５ 偏差演算器 ６ 比例積分演算器 ７ 回転数−流量特性発生器 ８ 乗算器 ９ 流量−回転数発生器 10 加算器 1 Water Supply Pump 2 Water Supply Pump Flow Control Device 3 Flow Rate Detector 4 Pressure Detector 5 Deviation Calculator 6 Proportional Integral Calculator 7 Rotation Speed-Flow Rate Characteristic Generator 8 Multiplier 9 Flow Rate-Rotation Speed Generator 10 Adder
Claims (2)
の流量の検出器とを備え、給水ポンプ流量と前記流量設
定値との偏差を演算し、その偏差を零とするように給水
ポンプ回転数指令を発生させる制御手段を備えた給水ポ
ンプ流量制御装置において、給水ポンプの流量−圧力特
性式から導かれる回転数−流量特性発生器と、前記回転
数−流量特性発生器から出力される回転数−流量ゲイン
を前記給水ポンプ流量と流量設定値との偏差に乗じる乗
算器とを有することを特徴とする給水ポンプ流量制御装
置。1. A water supply pump rotation is provided so as to include a flow rate set value of the water supply pump and a detector for the flow rate of the water supply pump, calculate a deviation between the water supply pump flow rate and the flow rate set value, and set the deviation to zero. In a feed water pump flow rate control device having a control means for generating a number command, a rotation speed-flow rate characteristic generator derived from a flow rate-pressure characteristic equation of the feed water pump, and a rotation output from the rotation speed-flow rate characteristic generator. A feed water pump flow rate control device comprising: a multiplier that multiplies the number-flow rate gain by the deviation between the feed water pump flow rate and the flow rate set value.
の流量の検出器とを備え、給水ポンプ流量と前記流量設
定値との偏差を演算し、その偏差を零とするように給水
ポンプ回転数指令を発生させる制御手段を備えた給水ポ
ンプ流量制御装置において、給水ポンプの流量−圧力特
性式から導かれる流量−回転数特性発生器と、前記流量
−回転数特性発生器から出力される回転数を前記給水ポ
ンプ回転数指令に加える加算器とを有することを特徴と
する給水ポンプ流量制御装置。2. A water supply pump flow rate set value and a detector for the flow rate of the water supply pump are provided, the deviation between the water supply pump flow rate and the flow rate set value is calculated, and the water supply pump rotation is performed so that the deviation becomes zero. In a feed water pump flow rate control device having a control means for generating a number command, a flow rate-rotation speed characteristic generator derived from a flow rate-pressure characteristic equation of the water supply pump, and a rotation output from the flow rate-rotation speed characteristic generator. A water supply pump flow control device, comprising: an adder for adding a number to the water supply pump rotation speed command.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23074194A JPH0874782A (en) | 1994-08-31 | 1994-08-31 | Feed pump flow rate control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23074194A JPH0874782A (en) | 1994-08-31 | 1994-08-31 | Feed pump flow rate control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0874782A true JPH0874782A (en) | 1996-03-19 |
Family
ID=16912579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23074194A Pending JPH0874782A (en) | 1994-08-31 | 1994-08-31 | Feed pump flow rate control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0874782A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005344536A (en) * | 2004-06-01 | 2005-12-15 | Yaskawa Electric Corp | Control device and control method for pump parallel operation |
| CN104454563A (en) * | 2014-10-21 | 2015-03-25 | 苏州合欣美电子科技有限公司 | Flow control method of water pump |
-
1994
- 1994-08-31 JP JP23074194A patent/JPH0874782A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005344536A (en) * | 2004-06-01 | 2005-12-15 | Yaskawa Electric Corp | Control device and control method for pump parallel operation |
| JP4662120B2 (en) * | 2004-06-01 | 2011-03-30 | 株式会社安川電機 | Pump parallel operation control device and control method |
| CN104454563A (en) * | 2014-10-21 | 2015-03-25 | 苏州合欣美电子科技有限公司 | Flow control method of water pump |
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