CN110374887A - A kind of overloading automatic protection control method of pump variable frequency device - Google Patents
A kind of overloading automatic protection control method of pump variable frequency device Download PDFInfo
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- CN110374887A CN110374887A CN201910634853.3A CN201910634853A CN110374887A CN 110374887 A CN110374887 A CN 110374887A CN 201910634853 A CN201910634853 A CN 201910634853A CN 110374887 A CN110374887 A CN 110374887A
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- power
- pressure
- control module
- control
- frequency
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0066—Control, e.g. regulation, of pumps, pumping installations or systems by changing the speed, e.g. of the driving engine
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
Abstract
A kind of overloading automatic protection control method of pump variable frequency device disclosed by the invention, belongs to water pump control technology field.The water pump system includes AC power source, pressure sensor, pump machine and special converter.The special converter includes AC frequency conversion circuit and control unit.Described control unit includes power computation module, signal acquisition module, constant pressure control module and power limitation control module, is responsible for the frequency setting value f of output electric currentSetting.Overload protection control method of the present invention, is mainly used in the control module of special converter control unit.Constant pressure control module in control module is responsible for power judgement, constant pressure frequency modulation；The judgement of power limitation control module pressure charge, invariable power frequency modulation.Overload protection control method of the present invention both ensure that the constant pressure control in rated operating range, while also realizing the power limitation control under overload condition, and completed the effective protection to pump machine by the in due course switching of constant pressure and invariable power frequency modulation.
Description
Technical field
The invention belongs to water pump control technology fields, and in particular to a kind of overloading automatic protection controlling party of pump variable frequency device
Method.
Background technique
Constant pressure water supply is generallyd use in current water system, to guarantee that each floor water pressure is sufficient.Pass through frequency conversion
Technology adjusts the constant pressure control method that frequency is realized, main trend is accounted in water-supply systems.So-called Isobarically Control, refers to pair
Pump outlet pressure makees constant pressure adjusting, according to the pressure signal that water outlet acquires, adjusts frequency converter output frequency, then controls
Pump machine revolving speed.A water outlet pressure value can be all set by the equipment that converter technique realizes constant pressure water supply, to guarantee pressure perseverance
It is fixed.But when overload condition occurs in the water pump system under Isobarically Control, meeting feed-water pump causes to damage.Citing: will be suitable for low
When the small-power water pump system of layer is applied to high-rise working environment；When water pump and water supply water pipe model mismatch etc..It is all such
Class situation all may cause pump machine and meet with overload problems.
Previous settling mode is to pick out the perfect Isobarically Control pump machine for meeting environmental requirement, and corresponding constant pressure parameter is wanted
Strictly meet environmental condition.However human factor or other reasons bring mismatch problem due to customer-side, it will all lead
It causes pump machine by overload condition, or even pump machine is made to work long hours under the operating condition that overloads.This can undoubtedly greatly shorten making for pump machine
Use the service life.
Summary of the invention
Pump machine is caused to be damaged to overcome the problems, such as that the water pump system in above situation under Isobarically Control is likely encountered overload, this
Invention proposes a kind of overloading automatic protection control method of pump variable frequency device, to protect the safe operation of pump machine.
In order to achieve the above objectives, the present invention is achieved by the following scheme:
A kind of overloading automatic protection control method of pump variable frequency device, the water pump include AC power source, pressure sensor,
Pump machine and water pump frequency converter.The AC power source is used to power to whole system；The pressure sensor for acquiring in real time
The pressure signal in pump machine exit；The pump machine is used to pressurize to the water in pipeline；Water pump frequency converter includes that exchange becomes
Frequency circuit and control unit, for adjusting the frequency f of pump machineSetting.The control unit includes power computation module, signal acquisition mould
Block and control module, control unit are run using PID approach；Computing module is for executing relevant calculation；Signal acquisition module will
The collected signal of pressure sensor is transferred to computing module；Control module includes constant pressure control module and power limitation control mould
Block is responsible for the frequency setting value f of output electric currentSetting。
Overload protection control method of the present invention, the main in due course switching for passing through constant pressure and invariable power frequency modulation, both
It ensure that the constant pressure control in rated operating range, while also realizing the power limitation control under overload condition, complete to pump machine
Effective protection.
The constant pressure control module the difference is that, adds power with previous PID constant pressure control mode
Decision condition P < PN.The constant pressure control module includes power decision procedure and constant pressure frequency modulation program.The power determines
Program refers to through decision condition P < PNDetermine whether pump machine overloads, when meeting decision condition P < PNWhen, carry out constant pressure frequency modulation；
When being unsatisfactory for decision condition P < PNWhen, cycle-index k is reset, and is switched to power limitation control module and is operated.
In the pressure PID control that the constant pressure frequency modulation is related to:
Fk=F is kth time pressure value sampling, eFIt (k) is kth time pressure value error；
For kth time pressure value increment, default eF(0)=
0；Wherein Kp1,Ki1,Kd1For preset value；
Due to F and f2MeetRelationship；
And then frequency setting value:Wherein LFIt is related with pump machine for definite value.
After circulation terminates, the frequency setting value f obtained in this pressure PID control is exportedSetting。
The power limitation control module, pressure decision procedure and invariable power frequency modulation program including Time-delayed trigger.It is described to prolong
When the pressure decision procedure that triggers, refer to that in power limitation control circulation k be more than NPShi Zhihang pressure decision procedure, the NPIt is permanent
The minimum number of power control cycle, by user's sets itself according to the actual situation, to guarantee frequency reducing protection behaviour when overload
Make effectively to implement.The pressure decision procedure refers to: passing through decision condition F < FNDetermining whether can be with security recovery constant pressure control
System, when meeting decision condition F < FNWhen, still carry out invariable power frequency modulation；When being unsatisfactory for decision condition F < FNWhen, power limitation control follows
Ring number k is reset, and is switched to constant pressure control module and is operated.The set value of the power is 0.9 times of rated value, i.e. PSetting
=0.9PN, it is ensured that the safe operation of pump machine under invariable power frequency modulation.
In the power P ID control that the invariable power frequency modulation is related to:
Pk=P is kth time sampled value, eP(k)=PSetting-PkFor kth time error amount；
For kth time performance number increment, default
eP(0)=0；Wherein Kp2,Ki2,Kd2For preset value；
Due to P and f3MeetRelationship；
And then frequency setting value:Wherein LPIt is related with pump machine for definite value；
After circulation terminates, the frequency setting value f obtained in this power P ID control is exportedSetting。
The overloading automatic protection control method point following steps of the pump variable frequency device are realized:
Step 1: when the pressure F that pressure sensor acquires pump machine outlet in real time is less than pressure set points FNWhen, control unit
Run constant pressure control module；Meanwhile the output power P of control unit real time monitoring pump machine.
Step 2: when the output power P of pump machine is less than the rated power P of pump machineNWhen, constant pressure control module is after reforwarding
Row；When the output power P of pump machine is greater than the rated power P of pump machineNWhen, control unit runs power limitation control module；And it records
Execute the cycle-index k of invariable power frequency modulation program.
Step 3: when the cycle-index k of invariable power frequency modulation program reaches the setting value N of invariable power frequency modulation programPWhen, control
Unit is with F < FNPressure judgement is carried out for decision condition: when meeting decision condition F < FNWhen, still carry out invariable power frequency modulation；When not
Meet decision condition F < FNWhen, power limitation control module is out of service, and constant pressure control module brings into operation.
Overloading automatic protection control method of the invention is to pass through power limitation control mould when pump machine is in overload operating condition
Block carries out invariable power frequency modulation, makes water pump in rated power PNInterior trouble free service guarantees pump machine safe operation；The operating condition that overloads is eliminated negative
When load restores normal, pump machine carries out constant pressure frequency modulation by constant pressure control module, guarantees the safe and highly efficient operation of pump machine.
Detailed description of the invention
Fig. 1 is the structure composition of water pump system of the invention.In figure: solid arrow indicates forceful electric power current direction, dotted line arrow
Head indicates forceful electric power current direction.
Fig. 2 is the structure composition of water pump frequency converter control unit of the invention.
Fig. 3 is the workflow signal in water pump frequency transformer control module of the invention.
Fig. 4 is the circulation process block diagram of Isobarically Control in water pump frequency transformer control module of the invention.
Fig. 5 is the circulation process block diagram of power limitation control in water pump frequency transformer control module of the invention.
Specific embodiment
In order to preferably state the present invention, now done so that the hydraulic pressure of certain residential building is adjusted as an example to introduce:
After water pump starting, control unit detects that the hydraulic pressure of exit of pump is 500Mpa, less than the setting value of hydraulic pressure
1000Mpa, control unit run constant pressure control module and pass through formula using water pump discharge pressure 1000Mpa as primary conditionAnd Kp1,Ki1,Kd1Preset value to calculate required power be 100Hz, wherein LFAmplitude be 31.6；By frequency
Parameter 100Hz passes to pump machine, and pump machine improves revolving speed, and then improves the output pressure of water pump, meanwhile, control unit real time monitoring
Whether the operation power of pump machine is more than pump machine rated power 1000kw.
For pump machine after the adjusting of control unit, the hydraulic pressure of output is 1000Mpa, and the actual power of motor is at this time
800kw。
After running a period of time, since urbanite water consumption amount increases in residential building, exit of pump hydraulic pressure drops to 700Mpa；With
Control unit continues to adjust pump machine revolving speed afterwards, to improve water pump discharge pressure, when the operating pressure of water pump reaches 900Mpa, and pump
The actual power of machine reaches 1001kw；Control unit terminates the operation of constant pressure control module at this time, starts power limitation control module
Operation.For control unit with 0.9 times of pump machine rated power, i.e. 900kw is primary condition, passes through formulaAnd Kp2,
Ki2,Kd2Preset value, calculating required frequency is 90Hz, wherein LPAmplitude be 9.375, frequency parameter 90Hz is passed into pump
Machine, pump machine adjusts revolving speed, and then adjusts the output pressure of water pump.
After power limitation control module runs 50 circulations, pump machine actual power is 900kw, and pump machine exit hydraulic pressure is
850Mpa, constant pressure control module continue to run；After constant pressure control module runs a period of time, urbanite water consumption is needed in residential building
Reduction is asked, control unit detects that pump machine outlet hydraulic pressure rises to 1001Mpa, and control system terminates power limitation control module fortune
Row starts constant pressure control module.
Claims (1)
1. a kind of overloading automatic protection control method of pump variable frequency device, which is characterized in that
The water pump includes AC power source, pressure sensor, pump machine and water pump frequency converter；The AC power source is used for entire
System power supply；The pressure sensor for acquiring the pressure signal in pump machine exit in real time；The pump machine is used for in pipeline
Water pressurization；The water pump frequency converter includes AC frequency conversion circuit and control unit, for adjusting the frequency f of pump machineSetting；It should
Control unit includes power computation module, signal acquisition module and control module, and control unit is run using PID approach；It calculates
Module is for executing relevant calculation；The collected signal of pressure sensor is transferred to computing module by signal acquisition module；
Control module includes constant pressure control module and power limitation control module, is responsible for the frequency setting value f of output electric currentSetting；Institute
The constant pressure control module stated adds power decision condition P < PN, include power decision procedure and constant pressure frequency modulation program；
Wherein, power decision procedure refers to through decision condition P < PNDetermine whether pump machine overloads, when meeting decision condition P < PN
When, carry out constant pressure frequency modulation；When being unsatisfactory for decision condition P < PNWhen, cycle-index k is reset, and switches to power limitation control module
It is operated；
In the pressure PID control that the constant pressure frequency modulation is related to: Fk=F is kth time pressure value sampling；eFIt (k) is kth time pressure
It is worth error；For kth time pressure value increment, default eF(0)=
0；Wherein Kp1,Ki1,Kd1For preset value；Due to F and f2MeetRelationship；And then frequency setting value:Wherein LFIt is related with pump machine for definite value；After circulation terminates, it exports in this pressure PID control
The frequency setting value f obtainedSetting；
The power limitation control module, pressure decision procedure and invariable power frequency modulation program including Time-delayed trigger；The delay touching
The pressure decision procedure of hair refers to that in power limitation control circulation k be more than NPShi Zhihang pressure decision procedure, the NPIt is invariable power
The minimum number of control loop, by user's sets itself according to the actual situation, to guarantee that frequency reducing protection operation when overload has
Effect is implemented；The pressure decision procedure refers to: passing through decision condition F < FNDetermine whether to control with security recovery constant pressure,
When meeting decision condition F < FNWhen, still carry out invariable power frequency modulation；When being unsatisfactory for decision condition F < FNWhen, power limitation control circulation
Number k is reset, and is switched to constant pressure control module and is operated；The set value of the power is 0.9 times of rated value, i.e. PSetting=
0.9PN, guarantee the safe operation of pump machine under invariable power frequency modulation；
In the power P ID control that the invariable power frequency modulation is related to: Pk=P is kth time sampled value；eP(k)=PSetting-PkFor kth time
Error amount；For kth time performance number increment, e is defaultedP
(0)=0；Wherein Kp2,Ki2,Kd2For preset value；Due to P and f3MeetRelationship；And then frequency setting value:Wherein LPIt is related with pump machine for definite value；After circulation terminates, it exports in this power P ID control
The frequency setting value f obtainedSetting；
The overloading automatic protection control method point following steps of above-mentioned pump variable frequency device are realized:
Step 1: when the pressure F that pressure sensor acquires pump machine outlet in real time is less than pressure set points FNWhen, control unit operation
Constant pressure control module；Meanwhile the output power P of control unit real time monitoring pump machine；
Step 2: when the output power P of pump machine is less than the rated power P of pump machineNWhen, constant pressure control module continues to run；Work as pump
The output power P of machine is greater than the rated power P of pump machineNWhen, control unit runs power limitation control module；And record the permanent function of execution
The cycle-index k of rate frequency modulation program；
Step 3: when the cycle-index k of invariable power frequency modulation program reaches the setting value N of invariable power frequency modulation programPWhen, control unit
With F < FNPressure judgement is carried out for decision condition: when meeting decision condition F < FNWhen, still carry out invariable power frequency modulation；When being unsatisfactory for
Decision condition F < FNWhen, power limitation control module is out of service, and constant pressure control module brings into operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910634853.3A CN110374887B (en) | 2019-07-15 | 2019-07-15 | Automatic overload protection control method for water pump frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910634853.3A CN110374887B (en) | 2019-07-15 | 2019-07-15 | Automatic overload protection control method for water pump frequency converter |
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| Publication Number | Publication Date |
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| CN110374887A true CN110374887A (en) | 2019-10-25 |
| CN110374887B CN110374887B (en) | 2020-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910634853.3A Active CN110374887B (en) | 2019-07-15 | 2019-07-15 | Automatic overload protection control method for water pump frequency converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115419578A (en) * | 2022-08-30 | 2022-12-02 | 杭州士腾科技有限公司 | Multi-water-pump communication system |
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| JP2010019222A (en) * | 2008-07-14 | 2010-01-28 | Sayama Seisakusho:Kk | Pressure control method and pressure control system of pump |
| CN107143001A (en) * | 2017-04-28 | 2017-09-08 | 南方中金环境股份有限公司 | A kind of variable-frequency variable-voltage intelligent water supply equipment and water-supply control |
| CN108490987A (en) * | 2018-01-26 | 2018-09-04 | 温州大学激光与光电智能制造研究院 | A kind of flow control system pump operation interval prediction method |
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2019
- 2019-07-15 CN CN201910634853.3A patent/CN110374887B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030087863A (en) * | 2002-05-10 | 2003-11-15 | 신한일전기주식회사 | Method for checking invertor error |
| JP2010019222A (en) * | 2008-07-14 | 2010-01-28 | Sayama Seisakusho:Kk | Pressure control method and pressure control system of pump |
| CN101350511A (en) * | 2008-09-16 | 2009-01-21 | 成都瑞科电气有限公司 | Twofold startup method protected by microcomputer protecting equipment |
| CN107143001A (en) * | 2017-04-28 | 2017-09-08 | 南方中金环境股份有限公司 | A kind of variable-frequency variable-voltage intelligent water supply equipment and water-supply control |
| CN108490987A (en) * | 2018-01-26 | 2018-09-04 | 温州大学激光与光电智能制造研究院 | A kind of flow control system pump operation interval prediction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115419578A (en) * | 2022-08-30 | 2022-12-02 | 杭州士腾科技有限公司 | Multi-water-pump communication system |
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