Control of the flow rate and fluid pressure in a pipeline network for optimum distribution of the fluid to consumers

• US 4,200,911 A
• Filed: 10/20/1977
• Issued: 04/29/1980
• Est. Priority Date: 10/20/1976
• Status: Expired due to Term

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Matsumoto, Kuniaki
• Primary Examiner(s): Gruber, Felix D.
• Application Number:
  US05/844,123
• Time in Patent Office: 922 Days
• Field of Search: 364/509, 364/510, 364/105, 364/106, 364/107, 137/561, 137/624.11
• US Class Current: 700/28
• CPC Class Codes: E03B 7/02 Public or like main pipe systems
• CPC Class Codes: F17D 1/08 for liquids or viscous products water-main or service pipe systems E03B7/04; domestic hot-water supply systems F24D17/00
• CPC Class Codes: F17D 5/00 Protection or supervision of installations arrangements for protecting foundations E02D31/00; protecting pipes from damage or internal or external wear F16L57/00, against corrosion and scale F16L58/00; investigation of the fluid-tightness of structures G01M3/00
• CPC Class Codes: Y10T 137/2688 Flow rate responsive
• CPC Class Codes: Y10T 137/8593 Systems
• CPC Class Codes: Y10T 137/86389 Programmer or timer

Abstract

Method and apparatus for optimum distribution of water supplied to consumers is disclosed.

At selected nodes of a network from which water is supplied to consumers, the actual water consumption is measured to detect a standard pattern for water demand in each selected area. Next, predicted demand patterns for each and every node are determined by comparing the characteristics or attributes of each area with those of areas having standard demand patterns. Thirdly, manipulated variables of pumps and valves installed in the pipeline network are controlled on the basis of predicted demand patterns.

Claims

1. A method of controlling the distribution of physical phenomena to users of said phenomena over an interconnected multinode distribution network comprising the steps of:

(a) measuring the user consumption of said phenomena at selected nodes and generated therefrom a set of respective normalized patterns of consumption of said physical phenomena;

(b) generating a plurality of normalized user demand patterns associated with each of the nodes of said interconnected multinode distribution network in accordance with prescribed user characteristics associated with each node;

(c) measuring the total consumption of said physical phenomena over a prescribed interval of time for each node of said network;

(d) assigning, to each node in said network, a respective one of said normalized patterns of consumption, in accordance with a prescribed relationship between the normalized user demand pattern associated with said each node and the normalized user demand patterns associated with said selected nodes;

(e) producing, for each node, a respective predicted user consumption demand pattern in accordance with the total consumption measured in step (c) and the normalized patterns of consumption assigned to each node in step (d); and

(f) controlling the distribution of said physical phenomena over said interconnected multinode distribution network in accordance with the predicted user consumption demand patterns produced in step (d).

2. In an interconnected multinode distribution network, wherein prescribed physical phenomena are supplied to the users thereof located in a plurality of areas, each of which areas is served by a respective node of said multinode distribution network, said system including a central control unit having data inputs coupled to said nodes and to the locations of the users of said phenomena for receiving prescribed data representative of the consumption of said phenomena, and having a plurality of outputs coupled to distribution control units, disposed within said network, for controlling the delivery of said phenomena through said network to said users, said central control unit including a central processor unit and associated memory for processing data coupled thereto and generating, in accordance with the processing of the data, control signals to be supplied to said distribution control units, a method controlling the distribution of said physical phenomena to said users comprising the steps of:

(a) measuring the user consumption of said phenomena at selected nodes and supplying data representative thereof to said central control unit;

(b) generating and storing, in said central control unit, a set of respective normalized patterns of consumption of said physical phenomena in accordance with the data measured in step (a);

(c) generating and storing in said central control unit a plurality of normalized user demand patterns associated with each of the nodes of said network in accordance with prescribed user characteristics associated with each node;

(d) measuring the consumption of said phenomena for each user served by the nodes of said network and supplying data representative thereof to said central control unit;

(e) generating and storing, in said central control unit, quantities representative of the total consumption of said physical phenomena over a prescribed interval of time for each node of said network in accordance with the data measured in step (d);

(f) assigning, for each node in said network, a respective one of the normalized patterns of consumption generated in step (b) in accordance with a prescribed relationship between the normalized user demand pattern associated with said each node and the normalized user demand patterns associated with said selected nodes;

(g) producing, for each node of said network, a respective predicted user consumption demand pattern in accordance with the total consumption quantities generated in step (e) and the normalized patterns of consumption assigned to each node in step (f); and

(h) generating control signals and supplying said control signals from said central control unit to said distribution control units to thereby control the distribution of said physical phenomena over said interconnected multinode distribution network in accordance with the predicted user consumption demand patterns produced in step (g).

3. The method of controlling an interconnected multinode distribution network according to claim 2, wherein said network is made up of a plurality of nodes N_k (where k=1, 2, 3 . . . z), each of which is located in a respective area of physical phenomena demand D_k (where k=1, 2, 3, . . . z), each demand area containing plural demand items R_i (where i=1, 2, 3, . . . m) by way of which the users of said network consume said physical phenomena and wherein step (c) includes supplying to said central control unit data representative of the occupation rate X_nk (R_i) for each respective demand area D_k, the occupation rate X_nk (R_i) being obtained as the ratio of the number of users N_Ri associated with demand item R_i to the total number of users N_T in demand area D_k to which said physical phenomena is supplied from node N_k.

4. The method of controlling an interconnected multinode distribution network according to claim 3, wherein step (f) comprises:

(f₁) sequentially comparing the occupation rate X_nk (R_i) with occupation rates X_nl (R_i), X_nm (R_i) . . . X_nn (R_i) for the demand areas served by said selected nodes;

(f₂) determining which occupation rate has the greatest similarity to occupation rate X_nk (R_i); and

(f₃) assigning that normalized pattern for consumption generated in step (b) which is associated with the demand area having the greatest similarity in comparison of occupation rate determined in step (f₂).

5. The method of controlling an interconnected multinode distribution network according to claim 4, wherein said network is a fluid conveying pipeline distribution network and said physical phenomena is a fluid.

6. The method of controlling an interconnected multinode distribution network according to claim 5, further comprising correcting the demand patterns for each node by performing the steps of:

(i) measuring the amount of fluid consumption at a node N_i in said pipeline network;

(j) determining the ratio of the amount of fluid consumption measured in step (i) with that stored in said central control unit for said note N_i ; and

(k) correcting the stored patterns of consumption for each node N_k in accordance with the ratio determined in step (j).

7. In a pipeline network system in which a network has a plurality of nodes N_k (where k=1, 2, 3, . . . z), from which fluid is supplied to respective demand areas D_k (where k=1, 2, 3, . . . z) each of which includes plural demand item R_i (where i=1, 2, 3, . . . m) and means for controlling the network comprises pumps, valves, control devices for controlling the pumps and the valves and a control unit having a memory unit and a processor unit for performing necessary operations on the basis of data and information obtained from the network and supplying outputs to the control devices, wherein a demand pattern at the node N_k is predetermined in the processor unit from the data and information stored in the memory unit and flow rate and fluid pressure in the network are controlled through the control devices to follow the predetermined demand pattern, a method for controlling the flow rate and fluid pressure in the pipeline network system, which comprises the steps of:

(a) inputting into the control unit the data and information on the occupation rate X_nk (R_i) for the demand area D_k, the occupation rate X_nk (R_i) being obtained as the ratio of the number of people N_Ri in the demand item R_i to the total number of people N_T in the demand area D_k to which the fluid is supplied from the node N_k ;

(b) measuring the change of fluid consumption with time at each of demand nodes N_l, N_m . . . N of some ones selected from among all the demand areas to obtain standard demand patterns Q_nl (t), Q_nm (t), . . . Q_nn (t);

(c) sequentially comparing the occupation rate X_nk (R_i) with those X_nl (R_i), X_nm (R_i), . . . X_nn (R_i) for the selected demand areas to detect one of the occupation rates having the greatest similarity with X_nk (R_i) so that the standard demand pattern for the selected demand area having the greatest similarity is used as the predetermined demand pattern for control of the demand area D_k ;

(d) producing signals indicative of the amount of fluid demand at the node N_k at any given time in accordance with the predetermined demand pattern; and

(e) controlling manipulated variables of the pumps and the valves on the basis of the signals indicative of the amount of fluid demand.

8. A system of controlling the distribution of physical phenomena to users of said phenomena over an interconnected multinode distribution network comprising, in combination:

means for measuring the user consumption of said phenomena at selected nodes and generating a set of data representative of respective normalized patterns of consumption of said physical phenomena;

means for measuring the total consumption of said physical phenomena over a prescribed interval of time for each node of said network;

data processor unit which

generates a plurality of data representative of normalized user demand patterns associated with each of the nodes of said interconnected multinode distribution network in accordance with prescribed user characteristics associated with each node,

assigns, to each node in said network, a respective one of said normalized patterns of consumption, in accordance with a prescribed relationship between the normalized user demand pattern associated with said each node and the normalized user demand patterns associated with said selected nodes, and

produces, for each node, a respective predicted user consumption demand pattern in accordance with the total measured consumption and the normalized patterns of consumption assigned to each node; and

means for controlling the distribution of said physical phenomena over said interconnected multinode distribution network in accordance with said predicted user consumption demand patterns.

9. In an interconnected multinode distribution network, wherein prescribed physical pehnomena are supplied to the users thereof located in a plurality of areas, each of which areas is served by a respective node of said multinode distribution network, said system including a central control unit having data inputs coupled to said nodes and to the locations of the users of said phenomena for receiving prescribed data representative of the consumption of said phenomena, and having a plurality of outputs coupled to distribution control units, disposed within said network, for controlling the delivery of said phenomena through said network to said users, said central control unit including a central processor unit and associated memory for processing data coupled thereto and generating in accordance with the processing of the data, control signals to be supplied to said distribution control units, a system controlling the distribution of said physical phenomena to said users comprising, in combination:

first means for measuring the user consumption of said phenomena at selected nodes and supplying data representative thereof to said central control unit;

second means for measuring the consumption of said phenomena for each user served by the nodes of said network and supplying data representative thereof to said central control unit; and

wherein, within said control unit, said central processor unit and its associated memory respectively generate and store

a set of respective normalized patterns of consumption of said physical phenomena in accordance with the data measured and supplied by said first means,

a plurality of normalized user demand patterns associated with each of the nodes of said network in accordance with prescribed user characteristics associated with each node, and

quantities representative of the total consumption of said physical phenomena over a prescribed interval of time for each node of said network in accordance with the data measured and supplied by said second means, and wherein

said central processor unit assigns, for each node in said network, a respective one of the normalized patterns of consumption generated in accordance with a prescribed relationship between the normalized user demand pattern associated with said each node and the normalized user demand patterns associated with said selected nodes, produces, for each node of said network, a respective predicted user consumption demand pattern in accordance with the total consumption quantities and the normalized patterns of consumption assigned to each node, and generates control signals in accordance with the

predicted user consumption demand patterns; and

wherein said control signals are supplied from said central processor unit to said distribution control units to thereby control the distribution of said physical phenomena over said interconnected multinode distribution network.

10. A system for controlling an interconnected multinode distribution network according to claim 9, wherein said network is made up of a plurality of nodes N_k (where k=1, 2, 3, . . . z), each of which is located in a respective area of physical phenomena demand D_k (where k=1, 2, 3, . . . z), each demand area containing plural demand items R_i (where i=1, 2, 3, . . . m), by way of which the users of said network consume said physical phenomena and wherein said central processor unit is supplied with data representative of the occupation rate X_nk (R_i) for each respective demand area D_k, the occupation rate X_nk (R_i) being obtained as the ratio of the number of users N_Ri associated with demand item R_i to the total number of users N_T in demand area D_k to which said physical phenomena is supplied from node N_k.

11. A system for controlling an interconnected multinode distribution network according to claim 10, wherein said central processor unit further:

sequentially compares the occupation rate X_nk (R_i) with occupation rates X_n (R_i), X_nm (R_i) . . . X_nn (R_i) for the demand areas served by said selected nodes;

determines which occupation rate has the greatest similarity to occupation rate X_nk (R_i); and

assigns that normalized pattern of consumption which is associated with the demand area having the greatest similarity in comparison of occupation rate to that associated with a selected node.

12. A system for controlling an interconnected multinode distribution network according to claim 11, wherein said network is a fluid conveying pipeline distribution network and said physical phenomena is a fluid.

13. A system for controlling an interconnected multinode distribution network according to claim 12, further comprising:

means for measuring the amount of fluid consumption at a node N_i in said pipeline network; and

wherein said central processor unit determines the ratio of the amount of measured fluid consumption with that stored in said central control unit for said node N_i and corrects the stored patterns of consumption for each node N_k in accordance with said ratio.

14. In a pipeline network system in which a network has a plurality of nodes N_k (where k=1, 2, 3, . . . z), from which fluid is supplied to respective demand areas D_k (where k=1, 2, 3, . . . z) each of which includes plural demand items R_i (where i=1, 2, 3, . . . m) and means for controlling the network comprising pumps, valves, control devices for controlling the pumps and the valves and a control unit having a memory unit and a processor unit for performing necessary operations on the basis of data and information obtained from the network and supplying outputs to the control devices, wherein a demand pattern at the node N_k is predetermined in the processor unit from the data and information stored in the memory unit and flow rate and fluid pressure in the network are controlled through the control devices to follow the predetermined demand pattern, a system for controlling the flow rate and fluid pressure in the pipeline network system, which comprises:

means for inputting into the control unit the data and information on the occupation rate X_nk (R_i) for the demand area D_k, the occupation rate X_nk (R_i) being obtained as the ratio of the number of people N_Ri in the demand item R_i to the total number of people N_T in the demand area D_k to which the fluid is supplied from the node N_k ;

means for measuring the change of fluid consumption with time at each of demand nodes N_l, N_m, . . . N_n of some ones selected from among all the demand areas to obtain standard demand patterns Q_nl (t), Q_nm (t), . . . Q_nn (t); and

wherein said processor unit sequentially compares the occupation rate X_nk (R_i) with those X_nl (R_i), X_nm (R_i) . . . X_nn (R_i) for the selected demand areas to detect one of occupation rates having the greatest similarity with X_nk (R_i) so that the standard demand pattern for the selected demand area having the greatest similarity is used as the predetermined demand pattern for control of the demand area D_k, and produces signals indicative of the amount of fluid demand at the node N_k at any given time in accordance with the predetermined demand pattern; and

means for controlling manipulated variables of the pumps and the valves on the basis of the signals indicative of the amount of fluid demand.