CN102121261A - Phase-locked loop synchronous switching and FNN intelligent variable frequency constant pressure water supply system - Google Patents
Phase-locked loop synchronous switching and FNN intelligent variable frequency constant pressure water supply system Download PDFInfo
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- CN102121261A CN102121261A CN201010022590XA CN201010022590A CN102121261A CN 102121261 A CN102121261 A CN 102121261A CN 201010022590X A CN201010022590X A CN 201010022590XA CN 201010022590 A CN201010022590 A CN 201010022590A CN 102121261 A CN102121261 A CN 102121261A
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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
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Abstract
The invention discloses a phase-locked loop synchronous switching and fuzzy neural network (FNN) intelligent variable frequency constant pressure water supply system. The system has the following working steps that: 1, a controller acquires an actual water pressure value of a water pressure acquisition device; 2, the controller compares the actual water pressure value acquired in the step 1 with the set water pressure value of the system; and 3, when the comparison in the step 2 has difference, the revolution speed of each asynchronous motor is controlled through a self-adjusting FNN module and a neural network self-setting module. Variable frequency control is performed on each asynchronous motor by using a phase-locked loop technology, and the neural network self-setting module can simultaneously regulate multiple proportion integration differentiation (PID) parameters on line. The interference influence of factors such as nonlinearity, time variation and the like in the constant pressure water supply system is overcome, the robustness of the constant pressure water supply system is enhanced, the steady state error of the system is eliminated, the problem of instable water pressure at a user side is well solved, and reliability and stability of the system are ensured.
Description
Technical field
The present invention relates to the hydrotechny field, relate in particular to a kind of varying speed and constant pressure feed water system of intelligence.
Background technology
In the hydrotechny field, when the demand that supplies water has bigger variation, must guarantee the constant of water pipe pipe network internal water pressure.In order to satisfy this technical need, in the jumbo water system, the technical scheme that provides pressure closed loop to regulate in the frequency converter outside generally is provided; Simultaneously, can also provide outside logic control to the loop control of many water pumps; When the switching of frequency conversion and power frequency supply, adopt main circuit to be connected in series the technological means of soft initiator reduced-voltage starting; By comprehensive employing said method, realize the technical purpose of constant pressure water supply.
Municipal water supply, high rise building water supply, industrial production periodical feeding etc. exist a lot of problems at technical elements, can not satisfy the development and the demand of current social but for a long time.
Japan Samco company has released a kind of constant pressure water supply substrate, has " variable frequency pump fixed form ", " variable frequency pump endless form " two kinds of alternative modes.It is integrated in hardware such as PID adjuster and PLC programmable logic controller on the Frequency Converter Control substrate, realizes the function of electric-control systems such as PLC and PID by instruction code is set.Therefore,,, just can directly control a plurality of built-in electromagnetic contactor work, can constitute the water system of maximum 7 motors (pump) as long as carry supporting constant pressure water supply unit based on this device.
The circuit structure of constant pressure water supply system has been simplified in the application of this device, has improved the reliability of constant pressure water supply system, has reduced equipment cost.But expanded function of this device output interface lacks flexibility, and has limited load-carrying capacity, so the scope of application is restricted, and is difficult to popularize in an all-round way and uses.
In the at present domestic constant pressure water supply engineering, adopt the rotating speed of external Frequency Converter Control water pump mostly, be aided with the closed-loop adjustment of water pipe ductwork pressure and the loop control of many water pumps, realize the technical purpose of constant pressure water supply; The employing programmable logic controller (PLC) that also has is achieved; The employing single-chip microcomputer and the corresponding software that also have are achieved.
These several control schemes, from the reliability aspect, PLC is better than single-chip microcomputer, and from the economy aspect, single-chip microcomputer is better than PLC.
On the handoff technique of frequency conversion and power frequency supply, most engineerings adopt the method for aforementioned main circuit serial connection soft starter to carry out reduced voltage starting, also there is the minority engineering to adopt the control impuls of blocking frequency converter when switching, makes frequency converter be output as zero, switch on the power frequency supply.
These two kinds of technical schemes, the former realizes that easily soft starter is generally component end item, but equipment investment is bigger; Latter's equipment investment is few, but frequency fluctuation is big, easily causes water pipe ductwork pressure instability.
The domestic constant pressure water supply special converter (5.5KW-45KW) of also having released need not external PLC and PID adjuster at present, and the circulation that can finish maximum 4 water pumps is switched, regularly start-stop and regularly circulation.This frequency converter is regulated pressure closed loop with circle logic control function and is integrated in the inner realization of frequency converter, and its output interface has limited load-carrying capacity, the system of low capacity in therefore only being applicable to.
In the research of varying speed and constant pressure feed water control system at home and abroad, the hydraulic pressure closed-loop control that exists in the big capacity constant pressure water supply system of centering and the steady switching problem of no disturbance of variable-frequency power sources and power frequency supply also do not have good solution at present.
Therefore, those skilled in the art is devoted to develop a kind of intelligent frequency-conversion constant pressure water supply system, the cost of investment of hicap with the performance of improving the constant pressure water supply system and in reducing.
Summary of the invention
Because the above-mentioned defective of prior art, technical problem to be solved by this invention provides a kind of intelligent frequency-conversion constant pressure water supply system that improves the performance of constant pressure water supply system and reduce cost of investment.
For achieving the above object, the invention provides a kind of phaselocked loop and switch synchronously and FNN intelligent frequency-conversion constant pressure water supply system, comprise at least: by the water pump group that N water pump formed, each described water pump disposes asynchronous machine respectively; At least one main water supply pipe connects watering and user side, and described main water supply pipe is provided with the hydraulic pressure deriving means; One controller, described controller comprise that at least a self-adjusting fuzzy neural network module and a neutral net are from adjusting module; When described main water supply pipe supplied water, described phaselocked loop switched synchronously and the job step of FNN intelligent frequency-conversion constant pressure water supply system is:
Step 1, described controller obtain the actual hydraulic pressure value of described hydraulic pressure deriving means;
Step 2, described controller compares actual hydraulic pressure value and the default hydraulic pressure value that described step 1 obtains;
Step 3, when in the described step 2 relatively difference appears and the time, by described self-adjusting fuzzy neural network module and described neutral net rotating speed from each the described asynchronous machine of module controls of adjusting.
In concrete enforcement of the present invention, also comprise step 4, when described actual hydraulic pressure value during greater than described default hydraulic pressure value, described controller is controlled described asynchronous machine and is slowed down; Or when described actual hydraulic pressure value during less than described default hydraulic pressure value, described controller is controlled described asynchronous machine speedup.
In other concrete enforcements of the present invention, also comprise step 5, the operation of described controller one or many repeating said steps one and described step 2, roughly the same until described actual hydraulic pressure value and described default hydraulic pressure value.
In other concrete enforcements of the present invention, in the described step 3, utilize the synchronous handoff technique of phaselocked loop that each described asynchronous machine is carried out variable frequency control, power supply is with the frequency homophase before and after realizing switching.
In other concrete enforcements of the present invention, in the described step 3, described neutral net is carried out online adjustment to a plurality of pid parameters simultaneously from the module of adjusting.
Intelligent frequency-conversion constant pressure water supply system of the present invention is owing to be incorporated into self-adjusting fuzzy neural network (FNN) control in phaselocked loop switching synchronously and the FNN intelligent frequency-conversion constant pressure water supply system, overcome well non-linear in the constant pressure water supply system, the time factor such as change interference effect, strengthened the robustness of constant pressure water supply system.
Usually, fuzzy control is equivalent to PD control, and the low shortcoming of stable state accuracy is arranged.When handling the variation of determined value and fuzzy quantity, the scale factor the when quantizing factor of obfuscation and judgement is changeless in whole process, has limited the raising of control performance.
The present invention has adopted neutral net from Tuning PID Controller, has overcome the shortcoming of traditional PID control parameter tuning difficulty, and a plurality of pid parameters are carried out online adjustment, has eliminated the steady-state error of system, has solved user side hydraulic pressure problem of unstable preferably.
When many water pump circulation variable frequency control, the present invention has also adopted the synchronous handoff technique of phaselocked loop, power supply is with the frequency homophase before and after guaranteeing to switch, solved the problem that produces super-high-current when phase place is inconsistent before and after the conversion thus, reduce switch current effectively, ensured reliability, the stability of system.
Below the technique effect of design of the present invention, concrete structure and generation is described further, to understand purpose of the present invention, feature and effect fully.
The specific embodiment
In phaselocked loop of the present invention switching synchronously and FNN intelligent frequency-conversion constant pressure water supply system one specific embodiment, form a water pump group, also comprise four asynchronous machines in the water pump group, be disposed at four water pumps respectively by four water pumps.
One main water supply pipe connects watering and user side, and this main water supply pipe is provided with hydraulic pressure and calculates.
One controller, this controller comprise that at least a self-adjusting fuzzy neural network module and a neutral net are from adjusting module.
When main water supply pipe supplied water, phaselocked loop of the present invention switched synchronously and the job step of FNN intelligent frequency-conversion constant pressure water supply system is:
Step 1, controller obtains the actual hydraulic pressure value of hydraulic gage;
Step 2, controller compares actual hydraulic pressure value and the default hydraulic pressure value that obtains;
Step 3, when in the step 2 relatively difference appears and the time, self-adjusting fuzzy neural network module by controller and neutral net are from the rotating speed of four asynchronous machines of module controls of adjusting.
Particularly, when actual hydraulic pressure value during greater than the default hydraulic pressure value, four asynchronous machines of controller control slow down;
When actual hydraulic pressure value during less than the default hydraulic pressure value, controller control asynchronous machine speedup.
After this, controller continues to read hydraulic pressure value, but and the operation of one or many repeating step one and step 2, roughly the same until actual hydraulic pressure value and default hydraulic pressure value.
In other concrete enforcements of the present invention, in the above-mentioned steps three, utilize the synchronous handoff technique of phaselocked loop that each asynchronous machine is carried out variable frequency control, power supply is with the frequency homophase before and after realizing switching.
In other concrete enforcements of the present invention, in the above-mentioned steps three, neutral net can be carried out online adjustment to three pid parameters simultaneously from the module of adjusting.
In the actual measurement process, compare with common frequency-changing pressure stabilizing system, in the system of the present invention, the metered flow of four water pumps is 30m
3/ h, rated head 70m, pump power 11kw, rated voltage 380V, rotating speed 2900rpm sets pressure of supply water 0.5Mpa.After system pressure was stable, by changing valve opening, after the flow sudden change, test result was as follows:
Existing frequency-changing pressure stabilizing system: the adjusting time, the hydraulic pressure overshoot was about 14.6% of steady pressure greater than 80 seconds; Asynchronous machine by conversion power supply when power frequency power supply is switched, even wave filter shows the time-delay that 100ms is arranged when switching is, system still exists very big overvoltage, the situation of over-current shock.
Intelligent frequency-conversion constant-voltage system of the present invention: overshoot is about 1.6%, and the adjusting time is about 40 seconds, and overshoot is little, and the rise time is short, stable state accuracy is high.
Asynchronous machine by conversion power supply when power frequency power supply is switched, even not having time-delay switches, two power supplys have kept the same frequency phase place switching moment, the electric current that flows through power frequency supply equals the rated current of motor substantially, therefore there is not very strong rush of current, also do not have torque ripple, handoff procedure equipment operates steadily, and has realized that security of system, reliable, no disturbance take over seamlessly.
Intelligent frequency-conversion constant pressure water supply system of the present invention has following beneficial effect for existing constant pressure water supply system:
1, native system reaches pressure stability in the hydraulic pressure adjustment process, regulates time decreased more than 50%, and water pressure fluctuations is less than 1.5%.
2, when frequency conversion and power frequency switching, do not have time-delay switched voltage, current waveform, two power supplys have kept the same frequency phase place, and electric current approximates rated current during switching, and no current impacts and torque ripple.
Therefore, the present invention can be widely used in dwelling house and plant water supply, irrigation system, water treatment system, fire fighting system or the like field.
More than describe preferred embodiment of the present invention in detail.The ordinary skill that should be appreciated that this area need not creative work and just can design according to the present invention make many modifications and variations.Therefore, all technician in the art all should be in claim protection domain of the present invention under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (5)
1. a phaselocked loop switches and FNN intelligent frequency-conversion constant pressure water supply system synchronously, comprises at least:
By the water pump group that N water pump formed, each described water pump disposes asynchronous machine respectively;
At least one main water supply pipe connects watering and user side, and described main water supply pipe is provided with the hydraulic pressure deriving means;
One controller, described controller comprise that at least a self-adjusting fuzzy neural network module and a neutral net are from adjusting module;
When described main water supply pipe supplied water, described phaselocked loop switched synchronously and the job step of FNN intelligent frequency-conversion constant pressure water supply system is:
Step 1, described controller obtain the actual hydraulic pressure value of described hydraulic pressure deriving means;
Step 2, described controller compares actual hydraulic pressure value and the default hydraulic pressure value that described step 1 obtains;
Step 3, when in the described step 2 relatively difference appears and the time, by described self-adjusting fuzzy neural network module and described neutral net rotating speed from each the described asynchronous machine of module controls of adjusting.
2. phaselocked loop as claimed in claim 1 switches synchronously and FNN intelligent frequency-conversion constant pressure water supply system, it is characterized in that: also comprise step 4, when described actual hydraulic pressure value during greater than described default hydraulic pressure value, described controller is controlled described asynchronous machine and is slowed down; Or when described actual hydraulic pressure value during less than described default hydraulic pressure value, described controller is controlled described asynchronous machine speedup.
3. phaselocked loop as claimed in claim 2 switches and FNN intelligent frequency-conversion constant pressure water supply system synchronously, it is characterized in that: also comprise step 5, the operation of described controller one or many repeating said steps one and described step 2, roughly the same until described actual hydraulic pressure value and described default hydraulic pressure value.
4. phaselocked loop as claimed in claim 1 switches and FNN intelligent frequency-conversion constant pressure water supply system synchronously, it is characterized in that: in the described step 3, utilize the synchronous handoff technique of phaselocked loop that each described asynchronous machine is carried out variable frequency control, power supply is with the frequency homophase before and after realizing switching.
5. phaselocked loop as claimed in claim 1 switches and FNN intelligent frequency-conversion constant pressure water supply system synchronously, it is characterized in that: in the described step 3, described neutral net is carried out online adjustment to a plurality of pid parameters simultaneously from the module of adjusting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201010022590XA CN102121261A (en) | 2010-01-08 | 2010-01-08 | Phase-locked loop synchronous switching and FNN intelligent variable frequency constant pressure water supply system |
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| CN201010022590XA CN102121261A (en) | 2010-01-08 | 2010-01-08 | Phase-locked loop synchronous switching and FNN intelligent variable frequency constant pressure water supply system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103529695A (en) * | 2013-10-08 | 2014-01-22 | 郭景礼 | Variable-frequency speed regulation water supply system based on day parting intelligent PID (proportion integration differentiation) regulator |
| CN104167968A (en) * | 2014-08-29 | 2014-11-26 | 东南大学 | Asynchronous motor vector control method |
| CN106120965A (en) * | 2016-06-24 | 2016-11-16 | 上海精智实业有限公司 | Pressure-stabilizing water supply system and method |
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| CN2042478U (en) * | 1989-02-04 | 1989-08-09 | 牟在洙 | Automatic water supply installation with constant pressure and changeable flow rate |
| JPH06102909B2 (en) * | 1991-02-26 | 1994-12-14 | 株式会社岩谷電機製作所 | Automatic water supply system |
| CN101256409A (en) * | 2008-04-08 | 2008-09-03 | 哈尔滨工程大学 | Control method for changing structure of underwater hiding-machine space based on recursion fuzzy neural network |
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| CN2042478U (en) * | 1989-02-04 | 1989-08-09 | 牟在洙 | Automatic water supply installation with constant pressure and changeable flow rate |
| JPH06102909B2 (en) * | 1991-02-26 | 1994-12-14 | 株式会社岩谷電機製作所 | Automatic water supply system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103529695A (en) * | 2013-10-08 | 2014-01-22 | 郭景礼 | Variable-frequency speed regulation water supply system based on day parting intelligent PID (proportion integration differentiation) regulator |
| CN104167968A (en) * | 2014-08-29 | 2014-11-26 | 东南大学 | Asynchronous motor vector control method |
| CN104167968B (en) * | 2014-08-29 | 2016-07-13 | 东南大学 | A kind of Vector Control System of Induction Motor method |
| CN106120965A (en) * | 2016-06-24 | 2016-11-16 | 上海精智实业有限公司 | Pressure-stabilizing water supply system and method |
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Application publication date: 20110713 |