JP2006031535A

JP2006031535A - End pressure controller

Info

Publication number: JP2006031535A
Application number: JP2004211612A
Authority: JP
Inventors: Kojiro Odagaki; 衡二郎小田垣
Original assignee: Toyo Electric Manufacturing Ltd
Current assignee: Toyo Electric Manufacturing Ltd
Priority date: 2004-07-20
Filing date: 2004-07-20
Publication date: 2006-02-02

Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problem of direct end pressure control: a consumer end is provided with a pressure transmitter, and a transmission device for transmitting a signal to a pump station is interposed between the pump station and a pump controller, so that control becomes unstable by pressure fluctuation or the like by a response delay of pump control because of pressure signal transmission delay, or end pressure constant control cannot be performed when abnormality occurs. <P>SOLUTION: In this direct end pressure controller, control constant gain is changed over by a difference amount between set pressure and actual end pressure, so that a control system wherein responsibility is improved and wherein stabilization is attained is realized. A main control mode is set as the direct end pressure control. When detecting abnormality of a direct end pressure control system, a bumpless changeover to (1) estimation end pressure control for calculating a setting value of discharge pressure by a discharge flow rate of a pump and controlling pump discharge pressure to the setting value, (2) discharge pressure constant control for making the discharge pressure constant regardless of the flow rate, or (3) step pressure control for stepwise controlling the discharge pressure by the discharge flow rate is performed as a backup control mode, and the constant control of the end pressure is more certainly realized. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、ポンプ場から水を供給する場合、需要家末端の圧力を一定に保つための制御装置に関するものである。 The present invention relates to a control device for keeping the pressure at a consumer end constant when supplying water from a pumping station.

水を供給するポンプ場より需要家までの距離が長い場合、管路抵抗による損失水頭により、需要家末端における水圧が低下してしまうため、末端圧を一定に制御する必要がある。そこで、需要家末端に発信器を設け、圧力信号をポンプ場まで伝送し、末端の水圧変動を少なくするよう制御する直接末端圧制御と、ポンプ場側にある流量発信器の流量信号と圧力発信器の圧力信号による推定末端圧制御により行われる。
一般的には、推定末端圧制御が採用されている（例えば、特許文献１参照。）。 When the distance from the pumping station that supplies water to the customer is long, the water pressure at the customer end is reduced due to the loss head due to the pipe resistance, so the end pressure needs to be controlled to be constant. Therefore, a transmitter is installed at the end of the customer, a pressure signal is transmitted to the pump station, direct end pressure control is performed to control the fluctuation of the water pressure at the end, and a flow signal and pressure transmission of the flow transmitter at the pump station side. This is performed by the estimated end pressure control by the pressure signal of the vessel.
Generally, estimated terminal pressure control is adopted (for example, refer to Patent Document 1).

しかし、推定末端圧制御では、吐出流量によりポンプの吐出圧の指令値を計算で求め、ポンプの吐出圧をその指令値になるように制御しているが、
１．推定末端圧制御は、吐出流量と吐出圧の関係が明確でない場合、これを決定するための調査が必要であるが、流量に対する管路の損失水頭を計算する方法は、複雑な管路網により計算は困難であった。又、実際の吐出流量及び吐出圧と需要家末端における水圧を実測したデータにより決定する方法もあるが、データ集積には高度な技術が必要であった。
２．諸条件が変化した場合、実際の末端の圧力がどのようになっているかわからない。
などの問題があった。 However, in the estimated terminal pressure control, the command value of the pump discharge pressure is calculated by the discharge flow rate, and the pump discharge pressure is controlled to be the command value.
1. Estimated end pressure control requires investigation to determine if the relationship between discharge flow rate and discharge pressure is not clear, but the method for calculating the head loss of the pipe with respect to the flow rate depends on the complicated pipe network. Calculation was difficult. In addition, there is a method of determining actual discharge flow rate, discharge pressure, and water pressure at the consumer end by actually measuring data, but advanced technology is required for data accumulation.
2. When conditions change, it is unclear what the actual end pressure is like.
There were problems such as.

直接末端圧制御は、遠方の需要家に圧力発信器が設けられ、ポンプ場まで信号を長距離伝送するための伝送装置がポンプ制御装置との間に介入し、圧力信号の伝送遅れが原因で、ポンプ制御の応答遅れによる圧力変動等制御不安定になってしまうなど制御が困難である。
特開平０８−２９１７９８号公報 In direct terminal pressure control, a pressure transmitter is installed at a distant consumer, and a transmission device for transmitting a signal over a long distance to the pump station intervenes with the pump control device. It is difficult to control because of unstable control such as pressure fluctuation due to response delay of pump control.
JP-A-08-291798

解決しようとする問題点は、直接末端圧制御による末端圧の不安定状態と、末端の発信器異常、伝送装置異常時の、末端圧力を一定にできない点である。 The problem to be solved is that the terminal pressure cannot be kept constant when the terminal pressure is unstable due to direct terminal pressure control and when the terminal transmitter is abnormal or the transmission device is abnormal.

本発明は、直接末端圧制御装置において、設定圧力と実末端圧力の偏差量により制御定数ゲインを切替て、応答性の向上、安定化を図る制御方式を最も主要な特徴とする。 The most important feature of the present invention is that the direct end pressure control device switches the control constant gain according to the amount of deviation between the set pressure and the actual end pressure to improve and stabilize the response.

本発明の末端圧制御装置は、主制御モードを直接末端圧制御とし、直接末端圧制御系の異常を検出した場合は、バックアップ制御モードとして、次の１〜３の制御モードにバンプレス切替を行う機能を有し、末端圧の一定をより確実に実現できる利点がある。
１．推定末端圧制御
２．流量に関係なく吐出圧を一定にする吐出圧一定制御
３．吐出流量により段階的に吐出圧を制御する段階圧制御 In the terminal pressure control device of the present invention, the main control mode is direct terminal pressure control, and when an abnormality of the direct terminal pressure control system is detected, the bumpless switching is performed to the following control modes 1 to 3 as the backup control mode. There is an advantage that a constant end pressure can be more reliably realized.
1. Estimated end pressure control 2. Discharge pressure constant control to keep discharge pressure constant regardless of flow rate. Step pressure control that controls discharge pressure step by step with discharge flow rate

直接末端圧制御装置の制御定数の設定、推定末端圧制御の制御定数設定、吐出圧一定制御の制御定数設定、段階圧制御の制御定数設定、バックアップ制御モード選択を外部より容易に設定できることを実現した。 Direct end pressure control device control constant setting, estimated terminal pressure control control constant setting, discharge pressure constant control control constant setting, step pressure control control constant setting, backup control mode selection can be easily set from the outside did.

図１の０１が本発明の末端圧制御装置であり、発明装置の１実施例の図である。
２０は需要家末端圧力検出部、２１需要家末端圧力信号伝送装置はその信号をポンプ場まで送る伝送装置であり、
３０はポンプ場側のポンプ吐出圧検出部、３１はポンプ吐出量検出部である。
２０需要家末端圧力検出部、２１需要家末端圧力信号伝送装置、３０ポンプ吐出圧検出部、３１ポンプ吐出量検出部からの計測信号を入力とし、１６吐出圧一定制御用定数設定器部，１７段階圧制御用定数設定器部，１８推定末端圧制御用定数設定器部，１９直接末端圧制御用設定器で各制御モード定数設定器からの定数により、１２偏差量による自動切替サンプリングＰＩＤ直接末端圧指令演算部，１３推定末端圧指令演算部，１４段階圧指令演算部，１５吐出圧一定指令演算部の各制御モード指令値算出演算部で算出された指令結果を、５０外部強制モード選択信号、異常検出信号の異常信号、モード強制切替信号により、１１の吐出圧指令選択演算部により、バンプレスに吐出圧指令を切替え、１０のＰＩ演算部に送り、その演算結果を、各ポンプの回転数指令として出力するものである。尚、１２偏差量による自動切替サンプリングＰＩＤ直接末端圧指令演算部と１９直接末端圧制御用設定器が設定圧力と実末端圧力の偏差量により制御定数ゲインを切替て、応答性の向上、安定化を図る直接末端圧制御部である。 Reference numeral 01 in FIG. 1 is a terminal pressure control apparatus of the present invention, and is a diagram of one embodiment of the invention apparatus.
20 is a consumer end pressure detector, and 21 a consumer end pressure signal transmission device is a transmission device that sends the signal to the pump station,
Reference numeral 30 denotes a pump discharge pressure detection unit on the pump station side, and reference numeral 31 denotes a pump discharge amount detection unit.
20 consumer end pressure detector, 21 consumer end pressure signal transmission device, 30 pump discharge pressure detector, 31 pump discharge amount detector, and 16 discharge pressure constant control constant setting unit, 17 Constant setting unit for step pressure control, constant setting unit for 18 estimated terminal pressure control, 19 direct terminal pressure control setting unit, automatic switching sampling PID direct terminal by 12 deviation amount according to constants from each control mode constant setting unit The command result calculated by each control mode command value calculation calculation unit of the pressure command calculation unit, 13 estimated terminal pressure command calculation unit, 14 step pressure command calculation unit, and 15 discharge pressure constant command calculation unit is used as the 50 external forced mode selection signal. The discharge pressure command selection calculation unit 11 switches the discharge pressure command to bumpless by the abnormality signal of the abnormality detection signal and the mode forcible switching signal, and the calculation result is sent to 10 PI calculation units. And outputs as the rotational speed command of each pump. In addition, automatic switching sampling PID direct end pressure command calculation unit and 19 direct end pressure control setter by 12 deviation amount switch control constant gain according to deviation amount between set pressure and actual end pressure, improve responsiveness and stabilize This is a direct end pressure control unit for achieving the above.

上水道、工業用水道、農業かんがい用水道などにおいて、需要家側の水圧一定を確実に行う用途に適用できる。 In waterworks, industrial water supply, agricultural irrigation water supply, etc., it can be applied to applications that ensure constant water pressure on the consumer side.

本発明装置の１実施例の図である。It is a figure of one Example of this invention apparatus.

Explanation of symbols

０１末端圧制御装置
１０ＰＩ演算部
１１吐出圧指令選択演算部
１２偏差量による自動切替サンプリングＰＩＤ直接末端圧指令演算部
１３推定末端圧指令演算部
１４段階圧指令演算部
１５吐出圧一定指令演算部
１６吐出圧一定制御用定数設定器部
１７段階圧制御用定数設定器部
１８推定末端圧制御用定数設定器部
１９直接末端圧制御用設定器
２０需要家末端圧力検出部
２１需要家末端圧力信号伝送装置
３０ポンプ吐出圧検出部
３１ポンプ吐出量検出部
４０ポンプ回転数指令
５０外部強制モード選択信号、異常検出信号 01 End Pressure Control Device 10 PI Calculation Unit 11 Discharge Pressure Command Selection Calculation Unit 12 Automatic Switching Sampling by Deviation PID Direct End Pressure Command Calculation Unit 13 Estimated End Pressure Command Calculation Unit 14 Stage Pressure Command Calculation Unit 15 Discharge Pressure Constant Command Calculation Unit 16 Constant setting unit for constant discharge pressure control 17 Constant setting unit for step pressure control 18 Constant setting unit for estimated end pressure control 19 Direct end pressure control setting unit 20 Customer end pressure detection unit 21 Customer end pressure signal Transmission device 30 Pump discharge pressure detector
31 Pump discharge amount detection unit 40 Pump rotation speed command 50 External forced mode selection signal, error detection signal

Claims

In the apparatus for controlling the end pressure to be constant so that the water supply side reduces the fluctuation of the water pressure at the end of the consumer to which the water is supplied, a pressure transmitter is provided at the end of the consumer, and the pump station at the water supply place A pressure signal is transmitted by a signal transmission device until the terminal pressure is controlled to be constant, a direct end pressure control unit, a flow rate signal of a flow rate transmitter on the pump station side of the water supply place, and the pressure transmitter A terminal pressure control apparatus characterized by combining estimated terminal pressure control, discharge pressure constant control, and step pressure control for making the terminal pressure constant by the pressure signal.