JP6289247B2 - Plant monitoring and control system - Google Patents

Plant monitoring and control system Download PDF

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JP6289247B2
JP6289247B2 JP2014090849A JP2014090849A JP6289247B2 JP 6289247 B2 JP6289247 B2 JP 6289247B2 JP 2014090849 A JP2014090849 A JP 2014090849A JP 2014090849 A JP2014090849 A JP 2014090849A JP 6289247 B2 JP6289247 B2 JP 6289247B2
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drainage
power amount
pump station
station
control system
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JP2015209665A (en
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彰 好本
彰 好本
和裕 原村
和裕 原村
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Mitsubishi Electric Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/222—Demand response systems, e.g. load shedding, peak shaving

Description

この発明は、複数の排水ポンプ場の監視制御を行うプラント監視制御システムに関するものである。   The present invention relates to a plant monitoring control system that performs monitoring control of a plurality of drainage pump stations.

従来のプラント制御システムにおいては、単一の施設における使用電力量を監視し、所定期間の積算電力量が所定電力量内に収まるように負荷を制御する機能を有している。（例えば、特許文献１参照）   The conventional plant control system has a function of monitoring the amount of power used in a single facility and controlling the load so that the integrated power amount within a predetermined period falls within the predetermined power amount. (For example, see Patent Document 1)

特許第４１１７２６７号公報（第３〜６頁、第１図）Japanese Patent No. 4117267 (pages 3 to 6, FIG. 1)

雨水を含む下水を貯留する貯留槽と、貯留槽に貯留された下水を排水する排水ポンプと、貯留槽に貯留された下水の水位を計測する水位計を備えた排水ポンプ場が複数存在し、各排水ポンプ場の使用電力量を計測し、排水ポンプ場の使用電力量が契約電力量を超えないように監視制御を行うプラント監視制御システムにおいて、単一の施設の使用電力量を超えないように負荷を制御する従来技術（特許文献１）は存在している。
しかしながら、複数の施設の使用電力を監視し、ある施設において所定期間の積算電力量が契約電力量を超える予測をしてデマンド警報を発報した場合に、別の排水ポンプ場での使用電力量の増加を予測して、その排水ポンプ場での負荷の制御を変動させるプラント制御システムは存在しなかった。 There are multiple drainage pump stations equipped with storage tanks for storing sewage containing rainwater, drainage pumps for draining sewage stored in the storage tanks, and water level gauges for measuring the level of sewage stored in the storage tanks, In a plant monitoring and control system that measures the power consumption of each drainage pumping station and monitors and controls so that the power consumption of the drainage pumping station does not exceed the contracted power consumption, do not exceed the power consumption of a single facility. There is a conventional technique (Patent Document 1) for controlling the load.
However, when the power consumption of multiple facilities is monitored and a demand alarm is issued when the cumulative power consumption for a given period is predicted to exceed the contracted power consumption at a certain facility, the power consumption at another drainage pump station There was no plant control system that predicted the increase in the load and changed the load control at the drainage pump station.

一般的に排水ポンプ場への下水流入量が増大した場合、上流の排水ポンプ場の貯留槽から水位が上昇し、その後、下流の排水ポンプ場の貯留槽の水位が上昇していく傾向にある。
そのため、ある排水ポンプ場の貯留槽の水位が急上昇して当該排水ポンプ場の排水ポンプを高負荷で運転した結果、デマンド警報が発報した場合、下流の排水ポンプ場においても負荷が高まり、デマンド警報が発生する可能性が高い。
しかし、特許文献１の従来のプラント監視制御システムでは、上流の排水ポンプ場においてデマンド警報を発報した時点で、下流の排水ポンプ場においても、排水ポンプを運転させ、当該排水ポンプ場の貯留槽の水位を下げて、将来の負荷を平準化しておくといった対応ができなかった。 Generally, when the amount of sewage inflow into the drainage pump station increases, the water level rises from the upstream drainage pump station storage tank, and then the water level of the downstream drainage pump station storage tank tends to rise. .
As a result, when the water level in a storage tank at a drainage pump station suddenly rises and the drainage pump at the drainage pumping station is operated at a high load, and a demand alarm is triggered, the load also increases at the downstream drainage pumping station. An alarm is likely to occur.
However, in the conventional plant monitoring and control system of Patent Document 1, when a demand alarm is issued at the upstream drainage pump station, the drainage pump is also operated at the downstream drainage pump station to store the drainage pump station. It was not possible to take measures such as lowering the water level and leveling the future load.

この発明は、上述のような課題を解決するためになされたものであり、下流側の排水ポンプ場における排水ポンプを、上流の排水ポンプ場におけるデマンド警報発生に基づいて制御するプラント監視制御システムを得ることを目的とする。   The present invention has been made to solve the above-described problems, and provides a plant monitoring control system that controls a drain pump in a downstream drain pump station based on a demand alarm occurrence in an upstream drain pump station. The purpose is to obtain.

この発明に係わるプラント監視制御システムにおいては、複数の排水ポンプ場の監視制御を行うプラント監視制御システムであって、各排水ポンプ場の契約電力量と各排水ポンプ場の位置関係を示す情報とを保存した保存部、及び排水ポンプ場の所定期間の積算電力量を演算し、この積算電力量が保存部に保存された契約電力量を超えると予測される場合にデマンド警報を発報する制御部を備え、制御部は、デマンド警報を発報した場合に、当該排水ポンプ場の下流に位置する排水ポンプ場に設置された排水ポンプを、排水量を増加させるように制御するものである。   The plant monitoring control system according to the present invention is a plant monitoring control system that performs monitoring control of a plurality of drainage pump stations, and includes contracted electric energy of each drainage pumping station and information indicating a positional relationship of each drainage pumping station. The stored storage unit and the control unit that calculates the integrated power amount for a predetermined period of the drainage pump station and issues a demand alarm when the integrated power amount is predicted to exceed the contracted power amount stored in the storage unit The control unit controls the drainage pump installed in the drainage pump station located downstream of the drainage pump station so as to increase the amount of drainage when the demand alarm is issued.

この発明によれば、複数の排水ポンプ場の監視制御を行うプラント監視制御システムであって、各排水ポンプ場の契約電力量と各排水ポンプ場の位置関係を示す情報とを保存した保存部、及び排水ポンプ場の所定期間の積算電力量を演算し、この積算電力量が保存部に保存された契約電力量を超えると予測される場合にデマンド警報を発報する制御部を備え、制御部は、デマンド警報を発報した場合に、当該排水ポンプ場の下流に位置する排水ポンプ場に設置された排水ポンプを、排水量を増加させるように制御するので、下流に位置する排水ポンプ場におけるデマンド警報の発生を抑止または遅延することができる。   According to this invention, it is a plant monitoring control system that performs monitoring control of a plurality of drainage pump stations, a storage unit that stores contract electric energy of each drainage pump station and information indicating the positional relationship of each drainage pump station, And a control unit that calculates an integrated power amount for a predetermined period of the drainage pump station and issues a demand alarm when the integrated power amount is predicted to exceed the contracted power amount stored in the storage unit. Controls the drainage pump installed at the drainage pumping station located downstream of the drainage pumping station so that the amount of drainage is increased when a demand alarm is issued. Alarm generation can be suppressed or delayed.

この発明の実施の形態１によるプラント監視制御システムを示すシステム構成図である。1 is a system configuration diagram illustrating a plant monitoring control system according to Embodiment 1 of the present invention. FIG. この発明の実施の形態１によるプラント監視制御システムの各ポンプ場の位置及び相互関係を示す図である。It is a figure which shows the position and mutual relationship of each pump station of the plant monitoring control system by Embodiment 1 of this invention. この発明の実施の形態１によるプラント監視制御システムにおけるテレメータ親局の演算部のデマンド警報を発報した際の処理を示すフローチャートである。It is a flowchart which shows the process at the time of issuing the demand alarm of the calculating part of the telemeter master station in the plant monitoring control system by Embodiment 1 of this invention. この発明の実施の形態２によるプラント監視制御システムのポンプ場の排水ポンプの水位運転を説明する図である。It is a figure explaining the water level driving | operation of the drainage pump of the pump station of the plant monitoring control system by Embodiment 2 of this invention. この発明の実施の形態２によるプラント監視制御システムにおけるテレメータ親局の演算部の積算電力量が所定電力量を超えると予測される場合の処理を示すフローチャートである。It is a flowchart which shows a process in case the integrated electric energy of the calculating part of the telemeter master station in the plant monitoring control system by Embodiment 2 of this invention is estimated to exceed predetermined electric energy. この発明の実施の形態２によるプラント監視制御システムの下流ポンプ場における積算電力量の推移を示す図である。It is a figure which shows transition of the integrated electric energy in the downstream pumping station of the plant monitoring control system by Embodiment 2 of this invention.

実施の形態１．
以下、この発明の実施の形態１を図に基づいて説明する。
図１は、この発明の実施の形態１によるプラント監視制御システムを示すシステム構成図である。
図１において、プラント監視制御システムは、下水処理場１と複数のポンプ場６（排水ポンプ場）に配置された設備によって構成されている。
下水処理場１は、中央監視室に設置された中央監視装置２と、この中央監視装置２とプラント制御ネットワーク３を経由して接続されたテレメータ親局４とから構成されている。テレメータ親局４は、各ポンプ場６に配置された複数のテレメータ子局５とアナログ専用回線等を経由して接続されている。
各ポンプ場６には、それぞれテレメータ子局５が設置されている。テレメータ子局５には、貯留槽１０に貯留された下水を排水する排水ポンプ７と、貯留槽１０に貯留された下水の水位を計測する水位計８と、ポンプ場６の電力量を計測する電力量計９とが接続されており、排水ポンプ７の運転、停止といったディジタル信号や、水位といったアナログ信号、また、使用電力量のパルス信号を取り込み、テレメータ親局４に渡している。
テレメータ親局４は、中央監視装置２からの操作、設定に基づき、テレメータ子局５を介して、各ポンプ場６の排水ポンプ７の制御を行っている。 Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings.
1 is a system configuration diagram showing a plant monitoring control system according to Embodiment 1 of the present invention.
In FIG. 1, the plant monitoring and control system is configured by facilities arranged in a sewage treatment plant 1 and a plurality of pumping stations 6 (drainage pumping stations).
The sewage treatment plant 1 includes a central monitoring device 2 installed in a central monitoring room, and a telemeter master station 4 connected to the central monitoring device 2 via a plant control network 3. The telemeter master station 4 is connected to a plurality of telemeter slave stations 5 arranged in each pump station 6 via an analog dedicated line or the like.
Each pump station 6 is provided with a telemeter slave station 5. In the telemeter slave station 5, the drainage pump 7 that drains the sewage stored in the storage tank 10, the water level meter 8 that measures the water level of the sewage stored in the storage tank 10, and the electric energy of the pump station 6 are measured. A watt-hour meter 9 is connected, and a digital signal such as operation and stop of the drainage pump 7, an analog signal such as a water level, and a pulse signal of the amount of power used are captured and passed to the telemeter master station 4.
The telemeter master station 4 controls the drain pumps 7 of the pump stations 6 via the telemeter slave stations 5 based on the operation and settings from the central monitoring device 2.

テレメータ親局４は、プラント制御ネットワーク３と通信するための通信部（制御ＮＷ）４ａと、テレメータ子局５と通信するための通信部（テレメータ）４ｃと、中央監視装置２からの指令に基づいて制御等を行う演算部４ｂと、設定値等のデータを保持する保存部４ｄを有している。
保存部４ｄには、中央監視装置２から設定される各ポンプ場６の契約電力量が保存されている。演算部４ｂは、所定期間（３０分間）の予測積算電力量を、電力量のパルス信号より演算し、その予測積算電力量が契約電力量を超える場合、デマンド警報を中央監視装置２に発報する。
また、テレメータ親局４の保存部４ｄでは、後述する図２のような、各ポンプ場６の位置や相互関係を示す位置関係情報を保存している。 The telemeter master station 4 is based on a command from the communication unit (control NW) 4 a for communicating with the plant control network 3, a communication unit (telemeter) 4 c for communicating with the telemeter slave station 5, and the central monitoring device 2. A calculation unit 4b that performs control and the like, and a storage unit 4d that holds data such as set values.
In the storage unit 4d, the contract power amount of each pump station 6 set from the central monitoring device 2 is stored. The calculating unit 4b calculates the predicted integrated power amount for a predetermined period (30 minutes) from the pulse signal of the power amount, and if the predicted integrated power amount exceeds the contracted power amount, a demand alarm is issued to the central monitoring device 2. To do.
Further, the storage unit 4d of the telemeter master station 4 stores positional relationship information indicating the position and mutual relationship of each pump station 6 as shown in FIG.

図２は、この発明の実施の形態１によるプラント監視制御システムの各ポンプ場の位置及び相互関係を示す図である。
図２において、上流にＡポンプ場、Ａポンプ場の下流にＢポンプ場とＣポンプ場、Ｃポンプ場の下流にＤポンプ場とＥポンプ場が位置している。保存部４ｄに保存される位置関係情報は、各ポンプ場の上位（上流）下位（下流）を明確にしたツリー構造になっている。 FIG. 2 is a diagram showing the position and mutual relationship of each pump station in the plant monitoring control system according to Embodiment 1 of the present invention.
In FIG. 2, an A pump station is located upstream, a B pump station and a C pump station are located downstream of the A pump station, and a D pump station and an E pump station are located downstream of the C pump station. The positional relationship information stored in the storage unit 4d has a tree structure in which the upper (upstream) and lower (downstream) of each pump station is clarified.

次に、テレメータ親局４の演算部４ｂにて、あるポンプ場６のデマンド警報を発報した際の動作について、図３のフローチャートを用いて説明する。
テレメータ親局４の演算部４ｂにて、あるポンプ場６のデマンド警報を検知した際、保存部４ｄから位置関係情報を読み出し、当該ポンプ場６の下位にポンプ場６が存在するかどうかを確認する（ｓｔｅｐ００１）。存在しない場合は、終了する。
存在する場合は、演算部４ｂは、保存部４ｄからデマンド警報を検知したポンプ場６から一段下位のポンプ場６を読み出す（一段下位に複数のポンプ場６が設定されている場合は全てのポンプ場６を読み出す）（ｓｔｅｐ００２）。
演算部４ｂは、読み出したポンプ場６に対し、排水ポンプ７の起動指令を通信部（テレメータ）４ｃ経由にて出力する（ｓｔｅｐ００３）。 Next, the operation when a demand alarm of a certain pump station 6 is issued in the arithmetic unit 4b of the telemeter master station 4 will be described with reference to the flowchart of FIG.
When the arithmetic unit 4b of the telemeter master station 4 detects a demand alarm of a certain pump station 6, the positional relationship information is read from the storage unit 4d and it is confirmed whether the pump station 6 exists below the pump station 6 (Step 001). If not, exit.
If present, the calculation unit 4b reads the pump station 6 that is one level lower than the pump station 6 that has detected the demand alarm from the storage unit 4d (if a plurality of pump stations 6 are set in one stage lower, all pumps 6 are set. Field 6 is read out) (step 002).
The calculation unit 4b outputs a start command for the drainage pump 7 to the read pump station 6 via the communication unit (telemeter) 4c (step 003).

実施の形態１によれば、あるポンプ場６でデマンド警報を検知した場合に、当該ポンプ場６の下流にあり、今後デマンド警報が検知される可能性の高いポンプ場６でも、予め貯留された下水を排水することが可能となり、デマンド警報の発生を抑止、もしくは、遅らせることが可能となる。   According to the first embodiment, when a demand alarm is detected at a certain pump station 6, the pump station 6 that is downstream of the pump station 6 and is likely to be detected in the future is stored in advance. It becomes possible to drain the sewage, and it is possible to suppress or delay the generation of a demand alarm.

実施の形態２．
実施の形態１に加えて、実施の形態２では、あるポンプ場６において積算電力量が所定電力量を超えると予測した時点から所定期間の満了までの期間と、その時点での当該ポンプ場６の下流にあるポンプ場６における積算電力量を考慮して、下流のポンプ場６の排水ポンプ７を制御する方法についてのものである。
実施の形態２の構成は、図１におけるものと同じものである。 Embodiment 2. FIG.
In addition to the first embodiment, in the second embodiment, the period from the time when the accumulated power amount is predicted to exceed the predetermined power amount in a certain pump station 6 to the expiration of the predetermined period, and the pump station 6 at that time point This is a method for controlling the drainage pump 7 of the downstream pumping station 6 in consideration of the integrated electric energy at the pumping station 6 downstream of the pumping station 6.
The configuration of the second embodiment is the same as that in FIG.

図４は、この発明の実施の形態２によるプラント監視制御システムのポンプ場の排水ポンプの水位運転を説明する図であり、複数の排水ポンプ７を備えたポンプ場６における一般的な排水ポンプ７の制御方法である水位運転を表している。
図４において、一般的なポンプ場６では、貯留槽１０の水位に対して運転台数を決めており、図４では水位Ｈ１で１台目運転、水位Ｈ２で２台目運転、水位Ｈ３で３台目運転となっており、水位がＬになるまでその台数にて運転を継続する。 FIG. 4 is a diagram for explaining the water level operation of the drainage pump in the pumping station of the plant monitoring control system according to Embodiment 2 of the present invention, and a general drainage pump 7 in the pumping station 6 having a plurality of drainage pumps 7. Represents the water level operation, which is a control method of
In FIG. 4, in the general pumping station 6, the number of operation is determined with respect to the water level of the storage tank 10, and in FIG. 4, the first operation at the water level H1, the second operation at the water level H2, and 3 at the water level H3. The operation is continued until the water level becomes L.

図６は、この発明の実施の形態２によるプラント監視制御システムの下流ポンプ場における積算電力量の推移を示す図である。
図６において、上流のポンプ場でデマンド警報が発生した場合の、下流のポンプ場における排水ポンプの運転台数ごとに予測した積算電力量を示している。 FIG. 6 is a diagram showing a transition of the integrated electric energy in the downstream pumping station of the plant monitoring control system according to Embodiment 2 of the present invention.
In FIG. 6, when the demand alarm is generated at the upstream pump station, the integrated electric energy predicted for each number of drain pumps operating at the downstream pump station is shown.

次に、排水ポンプ７を複数台備えるポンプ場６において、積算電力量が契約電力量を超えると予測される場合の、テレメータ親局４の演算部４ｂの動作について、図５のフローチャートを用いて説明する。
テレメータ親局４の演算部４ｂにて、あるポンプ場６のデマンド警報を検知した際、保存部４ｄから位置関係情報を読み出し、当該ポンプ場６の下位（下流）にポンプ場６が存在するかどうかを確認する（ｓｔｅｐ１０１）。存在しない場合は、終了する。
存在する場合、演算部４ｂは、保存部４ｄから、デマンド警報を検知したポンプ場６の一段下位のポンプ場６を読み出す（一段下位に複数のポンプ場６が設定されている場合は全てのポンプ場６を読み出す）（ｓｔｅｐ１０２）。 Next, in the pump station 6 having a plurality of drain pumps 7, the operation of the computing unit 4b of the telemeter master station 4 when the integrated power amount is predicted to exceed the contracted power amount is described with reference to the flowchart of FIG. explain.
When the arithmetic unit 4b of the telemeter master station 4 detects a demand alarm of a certain pump station 6, the positional relationship information is read from the storage unit 4d, and whether the pump station 6 exists below (downstream) the pump station 6 Whether or not is confirmed (step 101). If not, exit.
If present, the calculation unit 4b reads out the pump station 6 that is one level lower than the pump station 6 that has detected the demand alarm from the storage unit 4d (if a plurality of pump stations 6 are set at one level lower than all the pump stations 6) Field 6 is read out) (step 102).

一段下位のポンプ場６における、所定期間（３０分間）の開始から現在までの積算電力量を計算する（ｓｔｅｐ１０３）。そして、そのポンプ場６の積算電力量と所定期間満了までの期間から、その時点から排水ポンプ７の各台数（１台、２台、３台・・・）を運転させた場合の所定期間満了時点で予測される積算電力量を、台数ごとに図６のとおり計算し、残りの使用可能電力量を最大限使える排水ポンプ７の運転台数を求める（ｓｔｅｐ１０４）。   The integrated electric energy from the start of the predetermined period (30 minutes) to the present in the pump station 6 in the lower stage is calculated (step 103). Then, from the accumulated power amount of the pump station 6 and the period until the predetermined period expires, the predetermined period when the number of drain pumps 7 (one, two, three,...) Is operated from that point in time. The integrated power amount predicted at the time is calculated as shown in FIG. 6 for each number, and the number of drain pumps 7 that can use the remaining available power amount as much as possible is obtained (step 104).

演算部４ｂは、読み出したポンプ場６に対し、計算した運転台数を通信部（テレメータ）４ｃ経由にて出力する（ｓｔｅｐ１０５）。ポンプ場６では、その際の水位によらず指令の台数の排水ポンプ７を運転し、水位がＬになるまで運転を継続する。
また、演算部４ｂは、所定期間終了のタイミングにおいて、指令の運転台数の排水ポンプ７の運転を継続していた場合、排水ポンプ７の定格容量と運転台数より計算して、次の所定期間に積算電力量が契約電力量を超えるかどうかを予測し、超えると予測される場合にはデマンド警報を中央監視装置２に発報するとともにポンプ場６の排水ポンプ７の運転台数を減らす。
この場合にも、さらに下流のポンプ場６に対して、上述の制御を行う。 The calculation unit 4b outputs the calculated number of operating units to the read pump station 6 via the communication unit (telemeter) 4c (step 105). In the pump station 6, the commanded number of drainage pumps 7 are operated regardless of the water level at that time, and the operation is continued until the water level becomes L.
In addition, when the operation unit 4b continues the operation of the commanded number of drainage pumps 7 at the end of the predetermined period, the calculation unit 4b calculates the rated capacity of the drainage pumps 7 and the number of operation of the drainage pumps 7 in the next predetermined period. Whether or not the integrated power amount exceeds the contracted power amount is predicted, and if it is predicted to exceed, a demand warning is issued to the central monitoring device 2 and the number of drain pumps 7 in the pump station 6 is reduced.
Also in this case, the above-described control is performed for the pump station 6 further downstream.

実施の形態２によれば、上流のポンプ場６においてデマンド警報が発生した場合に、その下流のポンプ場６において、デマンド警報が発生した時点の電力量から所定期間終了までの電力量を有効に活用し、最大限の排水ポンプ能力を活用して排水することにより、時間を有効に活用し、将来に発生するであろう高負荷を平準化することができる。   According to the second embodiment, when a demand alarm is generated in the upstream pump station 6, the power amount from the time when the demand alarm is generated until the end of the predetermined period is made effective in the downstream pump station 6. By utilizing and draining using the maximum drainage pump capacity, time can be used effectively and the high load that will occur in the future can be leveled.

なお、本発明は、その発明の範囲内において、各実施の形態を自由に組み合わせたり、各実施の形態を適宜、変形、省略することが可能である。   It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

１ 下水処理場、２ 中央監視装置、３ プラント制御ネットワーク、
４ テレメータ親局、４ａ 通信部（制御ＮＷ）、４ｂ 演算部、
４ｃ 通信部（テレメータ）、４ｄ 保存部、５ テレメータ子局、６ ポンプ場、
７ 排水ポンプ、８ 水位計、９ 電力量計、１０ 貯留槽。 1 Sewage treatment plant, 2 Central monitoring device, 3 Plant control network,
4 telemeter master station, 4a communication unit (control NW), 4b arithmetic unit,
4c communication unit (telemeter), 4d storage unit, 5 telemeter slave station, 6 pump station,
7 drainage pump, 8 water level meter, 9 electricity meter, 10 storage tank.

Claims (3)

複数の排水ポンプ場の監視制御を行うプラント監視制御システムであって、
各排水ポンプ場の契約電力量と各排水ポンプ場の位置関係を示す情報とを保存した保存部、
及び上記排水ポンプ場の所定期間の積算電力量を演算し、この積算電力量が上記保存部に保存された契約電力量を超えると予測される場合にデマンド警報を発報する制御部を備え、
上記制御部は、上記デマンド警報を発報した場合に、当該排水ポンプ場の下流に位置する排水ポンプ場に設置された排水ポンプを、排水量を増加させるように制御することを特徴とするプラント監視制御システム。 A plant monitoring control system for monitoring and controlling a plurality of drainage pump stations,
A storage unit that stores contracted electric energy for each drainage pumping station and information indicating the positional relationship of each drainage pumping station,
And calculating a cumulative power amount of the drainage pump station for a predetermined period, and comprising a control unit that issues a demand alarm when the cumulative power amount is predicted to exceed the contracted power amount stored in the storage unit,
When the demand alarm is issued, the control unit controls a drain pump installed at a drain pump station located downstream of the drain pump station so as to increase the amount of drainage. Control system. 上記制御部は、上記デマンド警報を発報した場合に、上記下流に位置する排水ポンプ場の当該所定期間における積算電力量が上記契約電力量を超えない範囲で、排水ポンプの運転台数が最大になるように、上記下流に位置する排水ポンプ場の排水ポンプの運転台数を計算し、上記下流に位置する排水ポンプ場に指令することを特徴とする請求項１記載のプラント監視制御システム。   When the demand warning is issued, the control unit maximizes the number of drain pumps operated within a range in which the accumulated power amount in the predetermined period of the drain pump station located downstream does not exceed the contract power amount. The plant monitoring and control system according to claim 1, wherein the number of drain pumps operating at the downstream drainage pumping station is calculated so as to command the drainage pumping station located downstream. 上記制御部は、当該所定期間が終了したタイミングで、上記下流に位置する排水ポンプ場に指令した運転台数の排水ポンプの運転を継続した場合、次の所定期間に積算電力量が上記契約電力量を超えると予測される場合には、デマンド警報を発報するとともに排水ポンプの運転台数を減らすように上記下流に位置する排水ポンプ場に指令することを特徴とする請求項２記載のプラント監視制御システム。   When the control unit continues the operation of the number of drainage pumps commanded to the drainage pumping station located downstream at the timing when the predetermined period ends, the integrated power amount becomes the contracted power amount during the next predetermined period. 3. The plant monitoring control according to claim 2, wherein, if it is predicted that the value exceeds 1, the demand warning is issued and the drainage pump station located downstream is commanded to reduce the number of drainage pumps operated. system.
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