CN111206651A - Intelligent control pressure-regulating water supply method - Google Patents
Intelligent control pressure-regulating water supply method Download PDFInfo
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- CN111206651A CN111206651A CN201811391999.1A CN201811391999A CN111206651A CN 111206651 A CN111206651 A CN 111206651A CN 201811391999 A CN201811391999 A CN 201811391999A CN 111206651 A CN111206651 A CN 111206651A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 193
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000033228 biological regulation Effects 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 230000004069 differentiation Effects 0.000 claims abstract 2
- 230000010354 integration Effects 0.000 claims abstract 2
- 230000001105 regulatory effect Effects 0.000 abstract description 6
- 238000013461 design Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000008399 tap water Substances 0.000 description 3
- 235000020679 tap water Nutrition 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B11/00—Arrangements or adaptations of tanks for water supply
- E03B11/10—Arrangements or adaptations of tanks for water supply for public or like main water supply
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
- E03B7/072—Arrangement of flowmeters
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
- E03B7/078—Combined units with different devices; Arrangement of different devices with respect to each other
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Structural Engineering (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention relates to an intelligent control pressure-regulating water supply method. The method comprises the following specific steps: the water pump set pumps water to a user, a pressure gauge in a main pipeline sends detected pressure to a controller, the controller adopts a PID (proportion integration differentiation) regulation and fuzzy control method, the control cabinet controls the starting and stopping and the operating frequency of water pumps in the water pump set, when the total flow of a main water supply pipeline is below 60%, the controller adopts a traditional method to operate, when the water supply exceeds 60% of the total flow, the first water pump M1 is softly started through frequency conversion, when the full-load operation of the first water pump M1 is still under pressure, the second water pump M2 is softly started through frequency conversion, the first water pump M1 is switched to power frequency or operates at the same frequency with the second water pump M2, and the operation is analogized to the last water pump in turn. The invention adopts the method of estimating the flow by the total output frequency of the water pump to replace the use of a flowmeter. The original constant-pressure time-division quasi-real-time regulation is upgraded into intelligent pressure-regulating real-time regulation, and the output power of the water supply pump is controlled and regulated in real time according to the flow demand.
Description
Technical Field
The invention belongs to the technical field of electronics and control, and particularly relates to an intelligent control pressure-regulating water supply method.
Background
Water supply is closely related to life and production activities of people, and a large amount of electric energy is used in the aspect of water supply. Due to the influence of many factors such as design requirements, equipment parameter changes, uncertainty of demand quantity of demand ends and the like, the waste of electric energy is serious. The reduction of waste is an urgent need for social and economic benefits.
At present, the treated water in water works is pumped into a reservoir by a water replenishing pump for storage. When the end user needs water, the water supply pump is activated to deliver the water to each user terminal. The traditional water supply system adopts two methods for adjusting the water supply quantity: 1. a plurality of water pumps with the same parameters and types are connected in parallel to operate, and the water pumps are increased or decreased at any time according to the requirements; 2. the water pumps with different powers and similar or same lifts are connected in parallel to run, and different water pumps are started according to different requirements, so that the characteristic curve of the water pumps is matched with the curve of the pipe network, and the aim of saving energy is fulfilled. In order to ensure the pressure balance in the water pipe, the pressure of a pressure gauge monitoring system is arranged on the water outlet main pipe. When the pressure is too high, the opening degree of the bypass valve or the pressure valve at the tail end is adjusted to ensure that the water pressure in the water pipe is within a certain safe pressure range. Although the adjusting mode plays a role in maintaining the safe pressure of the system in a certain sense, the adjusting mode is based on the premise of increasing the water supply power of the water pump and wasting a large amount of water resources.
In general, water consumption is three peak periods per day, namely morning, noon and evening, and water consumption is not very large at other times. The water supply is carried out in such a way that the flow rate is small in most of the time except for the peak of water consumption. However, the design of the water pump is designed according to the maximum load during power frequency operation, and because the actual demand pressure at the load end is in continuous change, the output power of the traditional water supply pump operated at power frequency is constant within a certain time period, and the phenomenon that the water supply pressure is greater than the actual demand pressure often occurs. The phenomenon is particularly obvious when the water is used in the valley, so that a large amount of electric energy is wasted, and the danger of pipeline breakage is easily caused due to overlarge pressure when the water is used in the valley. The traditional energy-saving and protective measures not only increase or decrease the number of water supply pumps to adjust water supply, but also adjust the flow rate by changing the opening degree of a valve on a water supply pipeline. Opening a large valve to increase the flow; the valve is closed and the flow is reduced. Although the supply of the flow rate is controlled, a large amount of energy is consumed in throttling due to low control accuracy, which directly results in reduction of water supply efficiency.
The design of the water pump is designed according to the maximum load during power frequency operation, about 20% of margin is left in the design, so that the water pump can only reach about 80% of rated power during the peak period of water use (the maximum load period of water pump output), and the consumed power is correspondingly reduced to about 70% of the original power during the valley period of water use due to the reduction of the load of the water pump.
According to the characteristic that the larger the water consumption of a water supply system is, the smaller the pressure of the water supply system is, the traditional constant-pressure water supply method can realize larger energy-saving space by only maintaining the pressure of the system within the pressure range of the required maximum water consumption to ensure that the system can maintain constant-pressure water supply.
According to the characteristics of a water supply system, the constant-pressure water supply energy-saving equipment converts outlet water pressure information into a 0-5V voltage signal through a remote transmission pressure gauge arranged on a water outlet main pipe of a water pump, obtains an analog quantity which changes along with the load condition at any time through PID operation in an intelligent controller, and transmits the analog quantity to a control cabinet, so that the rotating speed of the water pump is controlled. Taking a tap water supply system as an example, when the water consumption of the system is large, the pressure in a pipe network is small, and the rotating speed of a water pump is increased to maintain the minimum pressure required by the system. When the water consumption of the system is small, the pressure in the pipe network is large, the rotating speed of the water pump is reduced, the flow required by the system is reduced, and the purpose of energy conservation is achieved. The whole regulation process is finally aimed at maintaining the pressure of the system constant, but in practical application and research we find that the tap water supply system is not constant in pressure.
In view of the water supply characteristics of tap water, a concept of constant pressure water supply at different time intervals is proposed. Different pressure values are set for different time periods, so that the consumed power of the water pump can be dynamically adjusted along with the change of the water consumption. Therefore, the working condition requirement of a water supply system can be met, and the energy-saving space can be more effectively and fully excavated, so that the energy-saving space is maximized. For example, at the time of low water consumption, a pressure of 0.18MPa is sufficient to meet the requirement of the system, at the time of small water consumption peak in the morning and at noon, a pressure of 0.2MPa kg is provided, and at the time of maximum water consumption in the evening, a maximum pressure required by the system is provided. Compared with the common constant-voltage variable-frequency energy-saving control mode, the control method saves a large amount of electric energy. Although the time-phased constant-pressure water supply meets certain energy-saving requirements, the water consumption at the same time of each day is different due to seasonal changes (such as summer and winter) and date changes (such as working days and rest days). In addition, when the water consumption is large, the water pressure drop of the pipeline can be increased due to the increase of the water flow speed in the pipeline, and the water pressure of a user side is insufficient. Therefore, during peak water usage, a certain water pressure needs to be supplemented to compensate for the water pressure drop generated on the pipeline.
Disclosure of Invention
The invention aims to provide an intelligent pressure-regulating water supply energy-saving control method.
The intelligent pressure-regulating water supply energy-saving control method adopts an intelligent pressure-regulating water supply energy-saving control device to intelligently regulate water supply, the intelligent pressure-regulating water supply energy-saving control device is composed of a water pump group 1, a pressure gauge 3, a controller 6 and a control cabinet 7, and the structure of the intelligent pressure-regulating water supply energy-saving control device is shown in figure 1. Wherein, the one end of water pump assembly 1 passes through pipe connection pond 5, and the other end passes through main water supply pipe 4 and connects the user side, is equipped with manometer 3 on the main water supply pipe 4 between water pump assembly 1 and the user side, manometer 3 connection director 6, and the other end connection control cabinet 7 of controller 6, switch board 7 connection water pump assembly 1. The water pump set 1 is formed by connecting N water pumps in parallel, wherein N is 1-6 groups; the method comprises the following specific steps: the water pump group 1 pumps water in the water tank 5 out and sends the water to users through a main water supply pipeline, a pressure gauge 3 in the main pipeline sends the detected pressure to a controller 6, the controller 6 adopts a PID regulation and Fuzzy (Fuzzy) control method, the flow percentage is estimated by adopting the total frequency output by the water pumps, namely the start-stop and the operation frequency of the water pumps in the water pump group 1 are controlled by a control cabinet 7, when the total flow of the main water supply pipeline is less than 60 percent, the traditional PID regulation constant pressure water supply can be adopted, when the water supply exceeds 60 percent of the total flow, taking N (N is more than or equal to 2) water pumps as an example, the first water pump M1 is soft started through frequency conversion, when the first water pump M1 is still undervoltage during full load operation, the second water pump M2 is soft started through frequency conversion, the first water pump M1 is switched to be operated at power frequency or the same frequency as the second water pump M2, and the analogy is done in turn, when the third water, the third water pump M3 is switched to the second water pump M2, and so on until the last water pump.
The invention judges the water consumption at the time by a method of estimating the flow by the total frequency output by the water pump motor so as to increase or decrease the pressure target value in the period. The output power of the motor can be regulated and controlled in real time according to the water consumption, namely the output frequency of the frequency converter is regulated to meet the water consumption requirements in different time periods; the second is the pipeline water pressure drop generated on the pipeline during the peak of the supplementary water. Compared with time-interval constant-voltage control, the method has better real-time performance and larger energy-saving space.
The invention adopts a method for indirectly judging the flow through the total working frequency of the water pump motor, because the water supply flow is approximately in a linear relation with the motor rotating speed and the power supply frequency. Therefore, the magnitude of the flow can be approximated by the total frequency value of the motor operation.
The method adopts the traditional PID regulation and Fuzzy (Fuzzy) control algorithm. The traditional PID controller has the advantages of simple structure, certain robustness, easy realization, small steady-state error and high control precision, and can meet the requirements of most industrial controls. However, in many industrial controls, there are non-linearity, large hysteresis, parameter time-varying property and model uncertainty to different degrees, so that it is difficult for the ordinary PID controller to obtain satisfactory control effect. The fuzzy control has the advantages of being capable of obtaining better dynamic response characteristics, needing no knowledge of a mathematical model of a controlled object, strong in adaptability, fast in rising time and good in robustness. However, fuzzy control also has inherent disadvantages and is easily limited by the limited level of fuzzy rules to cause errors. The method adopts Fuzzy-PID composite control. Makes up the defect of adopting PID algorithm only.
The invention adopts the method of estimating the flow by the total output frequency of the water pump to replace the use of a flowmeter.
In the water supply system, the original constant-pressure time-division quasi-real-time regulation is upgraded into intelligent pressure-regulating real-time regulation, and the output power of the water supply pump is controlled and regulated in real time according to the flow demand.
The invention has the beneficial effects that:
1. compared with time-interval constant-pressure control, the method is not limited by time intervals, and the target pressure value is regulated and controlled according to the actual water consumption, so that the real-time performance is better, and the energy-saving space is larger.
2. The method combining PID control and fuzzy control is adopted, the defect of singly adopting a PID control method is overcome, and the control effect is quicker and more stable.
3. The method for estimating the flow by adopting the total output frequency of the water pump avoids the inconvenience of installing a flowmeter on the main pipeline and saves the fund.
Drawings
Fig. 1 is a structural illustration of the present invention.
FIG. 2 is a graph of the pressure regulation in example 1.
FIG. 3 is a compensated pressure fuzzy control curve of example 1.
Reference numbers in the figures: 1 is the water pump group, 2 is the controllable power cord of water pump, 3 is the manometer, 4 is main water supply pipe, 5 is the pond, 6 is the controller, 7 is the switch board, 8 is the pressure measurement signal line.
Detailed Description
The invention is further illustrated by the following examples.
Example 1: the device consists of a 75KW water pump set, a 1MPa pressure gauge, an LDJ-3000 controller and an LDJ-2900 control cabinet, and the structure of the device is shown in figure 1. Wherein, the one end of water pump package passes through the pipe connection pond, and the other end passes through main water supply pipe connection user side, is equipped with the manometer on the main water supply pipe between water pump package and the user side, manometer connection director, the other end connection control cabinet of controller, and the pump unit is connected to the switch board.
As shown in fig. 2, when the water consumption is low and the water supply flow rate is low, that is, when the total flow rate is 60% or less, the PID-regulated constant-pressure water supply is used. When the water consumption peak is reached, the water supply amount exceeds 60% of the total flow, the number of the water pumps in the water pump group is set to be N, the highest frequency of each water pump is 50Hz, and the highest output of 3 water pumps is 150 Hz. In addition, the switching mode of each water pump adopts a circulating soft start, namely when the highest frequency of the first water pump is reached, the water pump is switched to power frequency, the next water pump is subjected to frequency conversion soft start from 0Hz, and if a third pump needs to be added, the sequence is the same as the above. When the pump is required to be reduced, the pump is reduced according to the principle of starting and stopping firstly. Before the latter increased pump does not reach 30Hz, the industrial frequency water pump has little effect on the counter pressure generated by the industrial frequency water pump, so that the compensation pressure amplitude is small in the range. Accordingly, the fuzzy control table is shown in table 1.
TABLE 1 percent compensated pressure fuzzy control chart
Claims (1)
1. An intelligent control pressure-regulating water supply method is characterized in that an intelligent pressure-regulating water supply energy-saving control device is adopted for intelligent pressure-regulating water supply, and consists of a water pump set (1), a pressure gauge (3), a controller (6) and a control cabinet (7), wherein one end of the water pump set (1) is connected with a water pool (5) through a pipeline, the other end of the water pump set is connected with a user end through a main water supply pipeline (4), the pressure gauge (3) is arranged on the main water supply pipeline (4) between the water pump set (1) and the user end, the pressure gauge (3) is connected with the controller (6), the other end of the controller (6) is connected with the control cabinet (7), and the control cabinet (7) is connected with the; the water pump set (1) is formed by connecting N water pumps in parallel, wherein N is 1-6 groups; the method comprises the following specific steps: the water pump set (1) pumps water in a water pool (5) to be sent to a user through a main water supply pipeline, a pressure gauge (3) in the main pipeline sends detected pressure to a controller (6), the controller (6) adopts a PID (proportion integration differentiation) regulation combined Fuzzy control method, the flow percentage is estimated by adopting the total frequency output by the water pump, namely, the start-stop and the running frequency of the water pump in the water pump set (1) are controlled through a control cabinet (7), when the total flow of the main water supply pipeline is less than 60 percent, the traditional PID regulation constant pressure water supply can be adopted, when the water supply exceeds 60 percent of the total flow, the first water pump M1 is firstly started through frequency conversion in a soft mode, when the first water pump M1 is still undervoltage in full load running, then the second water pump M2 is started through frequency conversion in a soft mode, the first water pump M1 is switched to be operated at power frequency or the same frequency with the second water pump M2, the third water pump M3 is switched to the second water pump M2, and so on until the last water pump.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811391999.1A CN111206651A (en) | 2018-11-21 | 2018-11-21 | Intelligent control pressure-regulating water supply method |
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| CN201811391999.1A CN111206651A (en) | 2018-11-21 | 2018-11-21 | Intelligent control pressure-regulating water supply method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112783224A (en) * | 2020-12-30 | 2021-05-11 | 中国长江电力股份有限公司 | Pressure maintaining system adopting variable-frequency pressure maintaining equipment and self-adaptive control method |
| CN116025035A (en) * | 2022-12-23 | 2023-04-28 | 北京水利发展有限公司 | Multi-unit water supply system with same-pressure quantity-keeping function and control method |
-
2018
- 2018-11-21 CN CN201811391999.1A patent/CN111206651A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112783224A (en) * | 2020-12-30 | 2021-05-11 | 中国长江电力股份有限公司 | Pressure maintaining system adopting variable-frequency pressure maintaining equipment and self-adaptive control method |
| CN116025035A (en) * | 2022-12-23 | 2023-04-28 | 北京水利发展有限公司 | Multi-unit water supply system with same-pressure quantity-keeping function and control method |
| CN116025035B (en) * | 2022-12-23 | 2023-11-17 | 北京水利发展有限公司 | Control method of same-pressure quantity-keeping multi-unit water supply system |
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Application publication date: 20200529 |