KR102644358B1 - Method and apparatus for determining optimal pump operation - Google Patents

Abstract

According to the present invention, disclosed are a method and an apparatus for determining an optimal operation point of a pump. According to the present invention, provided is an apparatus for determining an optimal operation point of a pump which includes a processor and a memory connected to the processor. The memory stores program instructions executed by the processor to update a state variable for each storage and a pump state variable for a plurality of pumps in a production plant, determine an allowable pipe pressure according to an amount of energy to be supplied to a designated storage, whether a valve of the designated storage is opened or closed, and a current energy storage amount using the updated state variable and determine an optimal operation point of the pump within the determined allowable pipe pressure by using a pump efficiency curve corresponding to each of the plurality of pumps and a combination thereof and past operation data of the plurality of pumps.

Description

{Method and apparatus for determining optimal pump operation}

The present invention relates to a method and device for determining the optimal operating point of a pump.

The energy supply system through pipelines is a social infrastructure facility that safely and efficiently supplies essential energy for daily life, such as water/sewage, domestic hot water, gas, and oil.

Pumps are essential for transmitting energy further from the production site or from lowlands to highlands, and they are facilities that account for a large portion of the power consumption in the energy supply system.

Recently, various optimization studies are being conducted to minimize operating costs in pump operation.

In general, pump operation is based on many years of pump operation data and the operator's know-how, and the primary goal is stable energy supply. Recently, information (energy storage amount, volume, gas volume, etc.) observed through the SCADA (Supervisory Control and Data Acquisition) system, a real-time remote monitoring and control system, is additionally used to operate these pumps. However, existing pump operations have been operated in a way that maintains the storage amount above a certain level for reasons of stability. In this case, there is a disadvantage in terms of energy efficiency as well as damage to the pump due to frequent operation and stop of the pump.

Accordingly, by comprehensively considering the energy demand and storage amount of the storage, the amount of energy flowing into each storage is adjusted through real-time pump operation to prevent unnecessary pump operation and ensure stable energy supply.

Republic of Korea Patent Publication No. 10-1818731

In order to solve the problems of the prior art described above, the present invention seeks to propose a method and device for determining the optimal operating point of a plurality of pumps in consideration of energy efficiency.

In order to achieve the above-described object, according to an embodiment of the present invention, an apparatus for determining a pump optimal operating point, comprising: a processor; And a memory connected to the processor, wherein the memory updates state variables for each reservoir and pump state variables for a plurality of pumps in the production plant, and uses the updated state variables to determine the amount of energy to be supplied to the designated reservoir, the amount of energy to be supplied to the designated reservoir, The allowable pipe pressure is determined according to whether the valve of the designated reservoir is open or closed and the current energy storage amount, and the pump efficiency curve corresponding to each of the plurality of pumps and their combination and the past operation data of the plurality of pumps are used to determine the allowable pipe pressure. A pump optimal operating point determination device storing program instructions executed by the processor is provided to determine the optimal pump operating point.

The designated reservoir may be defined as a reservoir to which energy must be supplied at the highest pressure among a plurality of reservoirs.

The reservoir state variable may include whether the valve is open or closed for each reservoir, the valve opening rate for each reservoir, and the current energy storage amount for each reservoir.

The pump state variables may include whether the constant speed pump is in operation, the discharge pipe pressure and amount of the constant speed pump, whether the variable speed pump is in operation, the discharge pipe pressure, amount and frequency of the variable speed pump, and water temperature.

The program commands predict the energy storage amount after a preset time of the designated storage using weather information, consumer energy usage, and past energy usage data, and prioritize the constant-speed pump and variable-speed pump according to the predicted energy storage amount. can be decided.

The program instructions may assign high priority to the constant-speed pump when the predicted energy storage amount is less than a preset threshold.

The past operation data may include correlation data between the past energy amount and discharge pipe pressure by each of the plurality of pumps and their combination, and correlation data between the past energy amount and power consumption.

The program instructions can determine the optimal operating point corresponding to the minimum power consumption among the points where the system curve corresponding to the pipe resistance estimated through the past operation data and the plurality of pump efficiency curves meet within the determined allowable pipe pressure range. there is.

According to another aspect of the present invention, there is provided a method for determining a pump optimal operating point in a device including a processor and memory, comprising: updating state variables for each reservoir and pump state variables for a plurality of pumps in a production plant; Using the updated state variable, determining an allowable pipe pressure according to the amount of energy to be supplied to the designated reservoir, whether the valve of the designated reservoir is opened or closed, and the current energy storage amount; And determining the optimal operating point of the pump, including the step of determining the optimal operating point within the determined allowable pipe pressure using pump efficiency curves corresponding to each of the plurality of pumps and their combination and past operation data of the plurality of pumps. A method is provided.

According to another aspect of the present invention, a computer program stored in a computer-readable recording medium that performs the above method is provided.

According to the present invention, there is an advantage of stably supplying energy to the storage while reducing power usage through past operation data and pump efficiency curves for a plurality of pumps.

Figure 1 is a diagram showing the configuration of a device for determining the optimal operating point of a pump according to a preferred embodiment of the present invention.
Figure 2 is a diagram showing in detail the algorithm for determining the optimal operating point of the pump according to this embodiment.
Figure 3 is a diagram showing the supply of energy from one production plant to a plurality of storages.
Figure 4 is a flowchart showing the process of determining the optimal operating point of the pump according to this embodiment.
Figure 5 is a diagram showing pump efficiency curves corresponding to each of a plurality of pumps and their combination according to this embodiment.
Figure 6 is a diagram showing past driving data according to this embodiment.
Figure 7 is a diagram showing the priority determination process of a constant speed pump and a variable speed pump according to a preferred embodiment of the present invention.

Since the present invention can make various changes and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention.

The terms used herein are only used to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as “comprise” or “have” are intended to indicate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

In addition, the components of the embodiments described with reference to each drawing are not limited to the corresponding embodiments, and may be implemented to be included in other embodiments within the scope of maintaining the technical spirit of the present invention, and may also be included in separate embodiments. Even if the description is omitted, it is natural that a plurality of embodiments may be re-implemented as a single integrated embodiment.

In addition, when describing with reference to the accompanying drawings, identical or related reference numbers will be assigned to identical or related elements regardless of the drawing symbols, and overlapping descriptions thereof will be omitted. In describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

Figure 1 is a diagram showing the configuration of a device for determining the optimal operating point of a pump according to a preferred embodiment of the present invention.

As shown in FIG. 1, the device according to this embodiment may include a processor 100 and a memory 102.

Here, the processor 100 may include a central processing unit (CPU) capable of executing a computer program or another virtual machine.

Memory 102 may include a non-volatile storage device, such as a non-removable hard drive or a removable storage device. Removable storage devices may include compact flash units, USB memory sticks, etc. Memory 102 may also include volatile memory, such as various types of random access memory.

This memory 102 is executed by the processor 100 and stored in a computer-readable recording medium, and program instructions for determining the optimal operating point of the pump are stored.

Program instructions according to this embodiment update state variables for each production plant and pump state variables for a plurality of pumps in the production plant, use the updated state variables to determine the amount of energy to be supplied to the designated reservoir, and whether the valve of the designated reservoir is opened or closed. And determining the allowable pipe pressure according to the current energy storage amount, and using the pump efficiency curve corresponding to each of the plurality of pumps and their combination and past operation data of the plurality of pumps, the optimal operating point of the pump within the determined allowable pipe pressure. decide.

The production plant according to this embodiment may be a place that stores purified water, and the storage may be a place that supplies water to each household, but it is not necessarily limited to this.

Figure 2 is a diagram showing in detail the algorithm for determining the optimal operating point of the pump according to this embodiment.

Referring to FIG. 2, the state variables of the reservoir may include whether the valve is opened or closed for each reservoir, the valve opening rate for each reservoir, and the current energy storage amount for each reservoir.

As shown in Figure 3, one production plant can supply energy to a plurality of reservoirs, and at this time, the state variables of the reservoirs include whether the valves for all reservoirs are open or closed, the valve opening rate for each reservoir, and the current energy storage amount for each reservoir. can do.

Additionally, the designated reservoir can be defined as the reservoir with the highest pump head, such as reservoir 2. In other words, the designated reservoir is defined as the reservoir to which energy must be supplied at the highest pressure among the plurality of reservoirs.

Additionally, the device according to this embodiment updates pump status variables for a plurality of pumps in the production plant.

Here, the pump state variables may include whether the constant speed pump is in operation, the discharge pipe pressure and amount of the constant speed pump, whether the variable speed pump is in operation, the discharge pipe pressure, amount and frequency of the variable speed pump, and water temperature.

A constant speed pump is a pump that is controlled on/off, and a variable speed pump is a pump in which the rotation speed of the impeller changes depending on a predetermined frequency range.

Figure 4 is a flowchart showing the process of determining the optimal operating point of the pump according to this embodiment.

Referring to Figure 4, store and plant status variables are updated (step 400), as described above.

The update according to this embodiment may be performed at a 1-minute cycle, but is not necessarily limited to this.

Thereafter, the device according to this embodiment uses the updated state variable to determine the allowable pipe pressure according to the amount of energy to be supplied to the designated reservoir, whether the valve of the designated reservoir is opened or closed, and the current energy storage amount (step 402).

Here, the allowable pipe pressure is the head for stably supplying energy to the designated reservoir.

As described above, after the allowable pipe pressure is determined, the optimal operating point within the determined allowable pipe pressure is determined using the pump efficiency curve corresponding to each of the plurality of pumps and their combination and past operation data of the plurality of pumps. (Step 404).

Figure 5 is a diagram showing pump efficiency curves corresponding to each of a plurality of pumps and their combination according to this embodiment.

Figure 5 shows pump efficiency curves corresponding to a plurality of pumps 1, 2, and 4 and their combinations.

In addition, as shown in FIG. 6, the past operation data according to this embodiment includes correlation data between the past energy amount and discharge pipe pressure by each of the plurality of pumps and their combination, and correlation data between the past energy amount and power consumption. It may include, and each colored dot on the pump efficiency curve in FIG. 5 reflects past operation data.

According to this embodiment, the number, combination, and frequency of pumps that must be operated within the allowable pipe pressure range determined in step 402 are determined, and the point at which power consumption is minimum is determined as the pump optimal operating point.

Conventionally, the number of pumps is determined based on the current energy storage amount of the storage, but when the storage energy storage decreases quickly or slowly, the control process can be performed differently by taking power usage into consideration.

Figure 7 is a diagram showing the priority determination process of a constant speed pump and a variable speed pump according to a preferred embodiment of the present invention.

Referring to FIG. 7, the device for determining the optimal operating point of the pump according to this embodiment collects weather information, energy usage at the consumer, and past energy usage data (step 700).

Using the data collected in this way, the amount of energy stored in the designated storage area after a preset time is predicted (step 702).

The allowable pressure is determined according to the predicted energy storage amount (step 704), and it is determined whether the predicted energy storage amount is below the threshold (step 706).

For example, if the predicted energy storage amount is less than a preset threshold, that is, if the energy storage amount is predicted to decrease quickly, high priority is given to the constant speed pump controlled on/off (step 708).

Meanwhile, if the predicted energy storage amount is higher than a preset threshold, that is, if the energy storage amount is predicted to decrease slowly, high priority is given to the variable speed pump whose head and energy amount change depending on the frequency (step 710).

As mentioned above, if the energy storage in the storage is predicted to decrease slowly, one or more variable-speed pumps among the plurality of pumps in the production plant are operated to supply energy to the storage, but if it is outside the predicted range, the frequency of the variable-speed pump is changed to supply energy to the storage. It can easily respond to changes in energy storage.

The above-described embodiments of the present invention have been disclosed for illustrative purposes, and those skilled in the art will be able to make various modifications, changes, and additions within the spirit and scope of the present invention, and such modifications, changes, and additions will be possible. should be regarded as falling within the scope of the patent claims below.

Claims (10)

As a device for determining the optimal operating point of a pump,
processor; and
Including a memory connected to the processor,
The memory is,
Update state variables for each reservoir and pump state variables for multiple pumps in the production plant,
Using the updated state variable, determine the allowable pipe pressure according to the amount of energy to be supplied to the designated reservoir, whether the valve of the designated reservoir is opened or closed, and the current energy storage amount for each reservoir,
About the pipe connected from the production site to the designated reservoir in order to stably supply energy to the designated reservoir using the pump efficiency curve corresponding to each of the plurality of pumps and their combination and past operation data of the plurality of pumps. To determine the optimal operating point of the pump within the determined allowable pipe pressure,
Store program instructions executed by the processor,
The designated reservoir is defined as a reservoir to which energy must be supplied at the highest pressure among a plurality of reservoirs,
The state variables for each reservoir include whether the valve is open or closed for each reservoir, the valve opening rate for each reservoir, and the current energy storage amount for each reservoir,
The pump state variables include whether the constant speed pump is in operation, the discharge pipe pressure and amount of the constant speed pump, whether the variable speed pump is in operation, the discharge pipe pressure, amount and frequency of the variable speed pump, and water temperature,
The program commands are:
Predict the energy storage amount after a preset time in the designated storage using weather information, consumer energy usage, and past energy usage data,
Priority is determined for each constant-speed pump and variable-speed pump according to the predicted energy storage amount,
If the predicted energy storage amount is less than a preset threshold, high priority is given to the constant speed pump,
The program commands are:
Determination of the optimal operating point of the pump, which determines the optimal operating point corresponding to the minimum power consumption among the points where the system curve corresponding to the pipe resistance estimated through the past operation data and the plurality of pump efficiency curves meet within the determined allowable pipe pressure range. Device. delete delete delete delete delete According to paragraph 1,
The past operation data includes correlation data between the past energy amount and discharge pipe pressure for each of the plurality of pumps and their combination, and correlation data between the past energy amount and power consumption. delete As a decision method for determining the optimal operating point of a pump in a device including a processor and memory,
Updating state variables for each reservoir and pump state variables for a plurality of pumps in the production plant;
Using the updated state variable, determining an allowable pipe pressure according to the amount of energy to be supplied to a designated reservoir, whether the valve of the designated reservoir is open or closed, and the current energy storage amount for each reservoir; and
About the pipe connected from the production site to the designated reservoir in order to stably supply energy to the designated reservoir using the pump efficiency curve corresponding to each of the plurality of pumps and their combination and past operation data of the plurality of pumps. Including the step of determining the optimal operating point within the determined allowable pressure,
The designated reservoir is defined as the reservoir to which energy must be supplied at the highest pressure among the plurality of reservoirs,
The state variables for each reservoir include whether the valve is open or closed for each reservoir, the valve opening rate for each reservoir, and the current energy storage amount for each reservoir,
The pump state variables include whether the constant speed pump is in operation, the discharge pipe pressure and amount of the constant speed pump, whether the variable speed pump is in operation, the discharge pipe pressure, amount and frequency of the variable speed pump, and water temperature,
The step of determining the optimal operating point is,
Predicting the energy storage amount after a preset time of the designated storage using weather information, consumer energy usage, and past energy usage data;
determining priorities for each of the constant-speed pump and the variable-speed pump according to the predicted energy storage amount;
If the predicted energy storage amount is less than a preset threshold, giving high priority to a constant speed pump; and
A pump comprising the step of determining an optimal operating point corresponding to minimum power consumption among the points where the system curve corresponding to the pipe resistance estimated through the past operation data and the plurality of pump efficiency curves meet within the determined allowable pipe pressure range. How to determine the optimal operating point. A computer program stored in a computer-readable recording medium that performs the method according to claim 9.