CN105839711A - Sensor-less variable frequency constant-pressure water supply control method - Google Patents
Sensor-less variable frequency constant-pressure water supply control method Download PDFInfo
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- CN105839711A CN105839711A CN201610172251.7A CN201610172251A CN105839711A CN 105839711 A CN105839711 A CN 105839711A CN 201610172251 A CN201610172251 A CN 201610172251A CN 105839711 A CN105839711 A CN 105839711A
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- pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a sensor-less variable frequency constant-pressure water supply control method. By simulating feedback of a pressure sensor by virtue of a pump characteristic model which is established on the basis of a flow capacity-head (pressure) curve and a flow capacity-power curve, closed loop variable-frequency constant-pressure water supply control of a pressure-free sensor is achieved; and after the establishment of the model, an expected pressure value can be randomly rewritten, and without redetermination, by setting parameters of a frequency converter, an effect of sensor movement can be achieved once again, so that constant-pressure control over a load at any end is completed.
Description
Technical field
The present invention relates to water-supply control, be specifically related to without sensor constant pressure water supply control method.
Background technology
nullWolong Electric (Group) Co., Ltd and Hangzhou Wolong Electric Institution Co., Ltd. combine in patent CN201410815493.4 of application and disclose no pressure sensor constant pressure water supply control method，It realizes the function maintaining water pump discharge pressure constant under no pressure sensor condition，Avoid pressure transducer and use the problems caused，Reduce buying and the maintenance cost of system，Improve the reliability of system，But，Water pump constant voltage data scaling step is just for a force value，When desired pressure value changes，Needs re-start demarcation，And it can only be arranged on the constant voltage effect of pump near-end by analog sensor，The constant voltage effect of load end cannot be arranged on by analog sensor，And when system exists multiple load，The method mentioned in above-mentioned patent document，Can only the pressure of permanent pump near-end，And cannot the pressure of permanent far-end load.
Summary of the invention
The present invention is directed to the problems referred to above, provide without sensor constant pressure water supply control method, the model setting up water pump is based on its characteristic curve, i.e. flow and lift (pressure), flow and the relation of power, after model has been set up, can arbitrarily rewrite desired pressure value, without redeterminating, can reproduce, by the setting to converter parameter, the effect that sensor moves, complete the constant pressure of arbitrary end load is controlled.
For solving above-mentioned technical problem, the technical scheme that the present invention uses is: without sensor constant pressure water supply control method, the pump characteristics model set up with power curve with lift (pressure) curve, flow based on flow, by the feedback of pump characteristics modeling pressure transducer, the closed loop constant pressure water supply reaching no pressure sensor controls.
Preferred as such scheme, the foundation of pump characteristics model comprises the following steps:
A) choosing one grade of frequency in from water pump minimum frequency of operation to rated operation frequency, regulation water pump operation is to this frequency；
B) controlling opening of valve, waits water pump discharge pressure stable reading, and record present flow rate Q, power P and lift (pressure) H are as one group of determination data；
C) repeat step B, the determination data of record is drawn on QP coordinate and QH coordinate, matching forming curves, two curves are considered as the characteristic curve under this frequency；
D) repeat step A, B, C, complete the determination data not less than 2 frequencies；
E) flow Q corresponding to each frequency and the coefficient of lift (pressure) H curve, flow Q and the coefficient of power P curve are calculated；
F) coefficient achieved above is organized into performance data table, as the foundation of frequency-changing pressure stabilizing operation method；
Preferred as such scheme, analog pressure sensor feedback carries out the method for closed loop constant pressure water supply control and comprises the following steps:
A) set desired pressure, start water pump；
B) water pump current power P and frequency F are obtained by converter, according to frequency search performance data table, it is thus achieved that the characteristic coefficient that ongoing frequency is corresponding；
C) set up flow Q and lift (pressure) H curve, flow Q and power P curve according to characteristic coefficient, according to the power obtained, curve finds flow and the lift (pressure) of correspondence；
D) compare feedback pressure and desired pressure, change frequency converter frequency by pid algorithm, regulate pump rotary speed, if feedback pressure improves less than desired pressure, rotating speed；If feedback pressure is more than desired pressure, rotating speed reduces；
E) step B, C, D are repeated, until feedback pressure arrives in the range of error of desired pressure.
Preferred as such scheme, subtracts one by the number of repetition of polynomial fitting curve and step B no less than polynomial high math power during matching forming curves.
Preferred as such scheme, completing the number of frequencies of determination data in water pump model establishment step is that 10 and decile minimum frequency are to rated operation frequency.
The invention has the beneficial effects as follows:
Relative to the advantage of the traditional frequency conversion constant pressure water supply technology having sensor, this invention removes purchasing and maintenance cost of sensor, reduce the expense of water system, more save；Pump characteristics is implanted converter, it is achieved all parts integrated, reduce energy consumption, more energy efficient；Eliminate the risk that sensor fault brings, and the impact that environmental factors is brought, more stable, more reliable；By arranging converter parameter, the effect of simulation movable sensor, more flexible.
Relative to the advantage of the electric patent in Wolong " no pressure sensor constant pressure water supply control method ",
In the electric patent in Wolong, water pump constant voltage data scaling step, just for a force value, when desired pressure value changes, needs to re-start demarcation.The model in this method set up water pump, based on its characteristic curve, i.e. flow and lift (pressure), flow and the relation of power, after model has been set up, can arbitrarily rewrite desired pressure value, it is not necessary to redeterminate.
The electric patent in Wolong can only be arranged on the constant voltage effect of pump near-end by analog sensor, it is impossible to analog sensor is arranged on the constant voltage effect of load end.When system exists multiple load, the method that Wolong is electric, can only the pressure of permanent pump near-end, and cannot the pressure of permanent far-end load, this method can reproduce, by the setting to parameter, the effect that sensor moves, and completes arbitrary end load constant Stress control.
Accompanying drawing explanation
Fig. 1 is the flow chart of the present invention；
Fig. 2 is flow Q and the graph of a relation of lift (pressure) H；
Fig. 3 is the graph of a relation of flow Q and power P.
Detailed description of the invention
Below in conjunction with embodiment, the detailed description of the invention of the present invention is further described.
As shown in Figure 1, the control method of constant pressure water supply without sensor, the pump characteristics model set up with power curve with lift (pressure) curve, flow based on flow, by the feedback of pump characteristics modeling pressure transducer, the closed loop constant pressure water supply reaching no pressure sensor controls.
Specifically include pump characteristics model establishment step and analog pressure sensor feeds back the step carrying out closed loop Isobarically Control.
1) step that pump characteristics model is set up:
A) choosing one grade of frequency in from water pump minimum frequency of operation to rated operation frequency, regulation water pump operation is to this frequency.
B) controlling opening of valve, waits water pump discharge pressure stable reading, and record present flow rate Q, power P and lift (pressure) H are as one group of determination data.
C) repeat step B, the determination data of record is drawn on QP coordinate and QH coordinate, selected polynomial fitting curve, two curves are considered as the characteristic curve under this frequency, the number of repetition of step B subtracts one no less than polynomial high math power；
D) repeat step A, B, C, complete the determination data of seven frequencies.
E) flow Q corresponding to each frequency and the coefficient of lift (pressure) H curve, flow Q and the coefficient of power P curve are calculated.
F) coefficient achieved above is organized into performance data table, as the foundation of frequency-changing pressure stabilizing operation method.
The relation of flow Q and lift (pressure) H as shown in Figure 2, the relation of flow Q and power P as shown in Figure 3.
2) analog pressure sensor feedback carries out the step of closed loop constant pressure water supply control:
A) set desired pressure, start water pump.
B) water pump current power P and frequency F are obtained by converter, according to frequency search performance data table, it is thus achieved that the characteristic coefficient that ongoing frequency is corresponding.
C) set up flow Q and lift (pressure) H curve, flow Q and power P curve according to characteristic coefficient, according to the power obtained, curve finds flow and the lift (pressure) of correspondence.
D) compare feedback pressure and desired pressure, change frequency converter frequency by pid algorithm, regulate pump rotary speed, if feedback pressure improves less than desired pressure, rotating speed；If feedback pressure is more than desired pressure, rotating speed reduces.
E) step B, C, D are repeated, until feedback pressure arrives in the range of error of desired pressure.
For a person skilled in the art; still the technical scheme described in foregoing embodiments can be modified; or wherein portion of techniques feature is carried out equivalent; all within the spirit and principles in the present invention; the any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (5)
1. without sensor constant pressure water supply control method, it is characterized in that, the pump characteristics model set up with power curve with lift (pressure) curve, flow based on flow, by the feedback of pump characteristics modeling pressure transducer, the closed loop constant pressure water supply reaching no pressure sensor controls.
2. as claimed in claim 1 without sensor constant pressure water supply control method, it is characterised in that the foundation of pump characteristics model comprises the following steps:
A) choosing one grade of frequency in from water pump minimum frequency of operation to rated operation frequency, regulation water pump operation is to this frequency；
B) controlling opening of valve, waits water pump discharge pressure stable reading, and record present flow rate Q, power P and lift (pressure) H are as one group of determination data；
C) repeat step B, the determination data of record is drawn on QP coordinate and QH coordinate, matching forming curves, two curves are considered as the characteristic curve under this frequency；
D) repeat step A, B, C, complete the determination data not less than 2 frequencies；
E) flow Q corresponding to each frequency and the coefficient of lift (pressure) H curve, flow Q and the coefficient of power P curve are calculated；
F) coefficient achieved above is organized into performance data table, as the foundation of frequency-changing pressure stabilizing operation method.
3. as claimed in claim 1 without sensor constant pressure water supply control method, it is characterised in that analog pressure sensor feedback carries out the method for closed loop constant pressure water supply control and comprises the following steps:
A) set desired pressure, start water pump；
B) water pump current power P and frequency F are obtained by converter, according to frequency search performance data table, it is thus achieved that the characteristic coefficient that ongoing frequency is corresponding；
C) set up flow Q and lift (pressure) H curve, flow Q and power P curve according to characteristic coefficient, according to the power obtained, curve finds flow and the lift (pressure) of correspondence；
D) compare feedback pressure and desired pressure, change frequency converter frequency by pid algorithm, regulate pump rotary speed, if feedback pressure improves less than desired pressure, rotating speed；If feedback pressure is more than desired pressure, rotating speed reduces；
E) step B, C, D are repeated, until feedback pressure arrives in the range of error of desired pressure.
4. as claimed in claim 2 without sensor constant pressure water supply control method, it is characterised in that during matching forming curves, to subtract one by the number of repetition of polynomial fitting curve and step B no less than polynomial high math power.
5. as claimed in claim 2 without sensor constant pressure water supply control method, it is characterised in that completing the number of frequencies of determination data in water pump model establishment step is that 10 and decile minimum frequency are to rated operation frequency.
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| CN201610172251.7A CN105839711A (en) | 2016-03-24 | 2016-03-24 | Sensor-less variable frequency constant-pressure water supply control method |
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| CN201610172251.7A CN105839711A (en) | 2016-03-24 | 2016-03-24 | Sensor-less variable frequency constant-pressure water supply control method |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106837767A (en) * | 2017-04-01 | 2017-06-13 | 北京慧鎏科技有限公司 | The control method of pump, control device and system |
| CN106989478A (en) * | 2017-02-24 | 2017-07-28 | 深圳达实智能股份有限公司 | Applied to the isobaric method for controlling frequency conversion of hospital's size chilled water pump in parallel and device |
| CN107503398A (en) * | 2017-07-29 | 2017-12-22 | 嘉兴极致传动科技有限公司 | A kind of intelligent revival method of no pressure sensor constant pressure water supply system |
| CN109030109A (en) * | 2018-09-27 | 2018-12-18 | 中国水利水电科学研究院 | A kind of suspended load sampler and sampling method for flume test |
| CN109059216A (en) * | 2018-06-20 | 2018-12-21 | 广东美的暖通设备有限公司 | The control method and device of air-conditioning system and its water pump |
| CN109062127A (en) * | 2018-08-21 | 2018-12-21 | 上海海德隆流体设备制造有限公司 | A kind of water pump self-adaptation control method and device |
| CN110118170A (en) * | 2019-05-09 | 2019-08-13 | 常州市康迪克至精电机有限公司 | Using the water pump perseverance lift control method of direct current permanent magnet motor no pressure sensor |
| CN111350651A (en) * | 2020-03-12 | 2020-06-30 | 利欧集团浙江泵业有限公司 | Constant-pressure control method of intelligent variable-frequency water pump |
| CN111828299A (en) * | 2020-07-16 | 2020-10-27 | 上海熠动动力科技有限公司 | Constant-pressure water supply control method without pressure sensor |
| CN113309186A (en) * | 2021-05-31 | 2021-08-27 | 北控水务(中国)投资有限公司 | Water purification plant clean water pool water level management energy-saving control method and system |
| CN114046259A (en) * | 2021-11-12 | 2022-02-15 | 利欧集团浙江泵业有限公司 | Centrifugal pump frequency conversion control method based on double neural network model |
| CN116069075A (en) * | 2022-12-02 | 2023-05-05 | 山东省农业机械科学研究院 | High-efficiency accurate constant-pressure water supply control method, system and readable storage medium |
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| JPH10195939A (en) * | 1997-01-16 | 1998-07-28 | Teraru Kyokuto:Kk | Water supply equipment to prevent rotting of water |
| CN104563219A (en) * | 2014-12-24 | 2015-04-29 | 卧龙电气集团股份有限公司 | Water supply control method without external sensor |
| CN104563217A (en) * | 2014-12-24 | 2015-04-29 | 卧龙电气集团股份有限公司 | Constant-pressure water supply controlling method without pressure sensor |
| CN105386487A (en) * | 2015-12-08 | 2016-03-09 | 卧龙电气集团股份有限公司 | Automatic calibration system for sensor-less constant-pressure water supply and working method of automatic calibration system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH10195939A (en) * | 1997-01-16 | 1998-07-28 | Teraru Kyokuto:Kk | Water supply equipment to prevent rotting of water |
| CN104563219A (en) * | 2014-12-24 | 2015-04-29 | 卧龙电气集团股份有限公司 | Water supply control method without external sensor |
| CN104563217A (en) * | 2014-12-24 | 2015-04-29 | 卧龙电气集团股份有限公司 | Constant-pressure water supply controlling method without pressure sensor |
| CN105386487A (en) * | 2015-12-08 | 2016-03-09 | 卧龙电气集团股份有限公司 | Automatic calibration system for sensor-less constant-pressure water supply and working method of automatic calibration system |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106989478B (en) * | 2017-02-24 | 2020-02-14 | 深圳达实智能股份有限公司 | Isobaric frequency conversion control method and device applied to large and small parallel chilled water pumps in hospital |
| CN106989478A (en) * | 2017-02-24 | 2017-07-28 | 深圳达实智能股份有限公司 | Applied to the isobaric method for controlling frequency conversion of hospital's size chilled water pump in parallel and device |
| CN106837767B (en) * | 2017-04-01 | 2018-04-06 | 北京慧鎏科技有限公司 | The control method and system of pump |
| CN106837767A (en) * | 2017-04-01 | 2017-06-13 | 北京慧鎏科技有限公司 | The control method of pump, control device and system |
| CN107503398A (en) * | 2017-07-29 | 2017-12-22 | 嘉兴极致传动科技有限公司 | A kind of intelligent revival method of no pressure sensor constant pressure water supply system |
| CN109059216A (en) * | 2018-06-20 | 2018-12-21 | 广东美的暖通设备有限公司 | The control method and device of air-conditioning system and its water pump |
| CN109059216B (en) * | 2018-06-20 | 2020-08-04 | 广东美的暖通设备有限公司 | Air conditioning system and control method and device of water pump of air conditioning system |
| CN109062127A (en) * | 2018-08-21 | 2018-12-21 | 上海海德隆流体设备制造有限公司 | A kind of water pump self-adaptation control method and device |
| CN109030109A (en) * | 2018-09-27 | 2018-12-18 | 中国水利水电科学研究院 | A kind of suspended load sampler and sampling method for flume test |
| CN110118170A (en) * | 2019-05-09 | 2019-08-13 | 常州市康迪克至精电机有限公司 | Using the water pump perseverance lift control method of direct current permanent magnet motor no pressure sensor |
| CN111350651A (en) * | 2020-03-12 | 2020-06-30 | 利欧集团浙江泵业有限公司 | Constant-pressure control method of intelligent variable-frequency water pump |
| CN111828299A (en) * | 2020-07-16 | 2020-10-27 | 上海熠动动力科技有限公司 | Constant-pressure water supply control method without pressure sensor |
| CN113309186A (en) * | 2021-05-31 | 2021-08-27 | 北控水务(中国)投资有限公司 | Water purification plant clean water pool water level management energy-saving control method and system |
| CN114046259A (en) * | 2021-11-12 | 2022-02-15 | 利欧集团浙江泵业有限公司 | Centrifugal pump frequency conversion control method based on double neural network model |
| CN114046259B (en) * | 2021-11-12 | 2024-05-28 | 利欧集团浙江泵业有限公司 | Centrifugal pump variable frequency control method based on double neural network model |
| CN116069075A (en) * | 2022-12-02 | 2023-05-05 | 山东省农业机械科学研究院 | High-efficiency accurate constant-pressure water supply control method, system and readable storage medium |
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Application publication date: 20160810 |