CN114396375B - Limiting power control method of electric chemical engineering machinery - Google Patents
Limiting power control method of electric chemical engineering machinery Download PDFInfo
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- CN114396375B CN114396375B CN202210164202.4A CN202210164202A CN114396375B CN 114396375 B CN114396375 B CN 114396375B CN 202210164202 A CN202210164202 A CN 202210164202A CN 114396375 B CN114396375 B CN 114396375B
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- motor
- power
- main pump
- frequency
- working
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000003889 chemical engineering Methods 0.000 title claims abstract description 7
- 238000010521 absorption reaction Methods 0.000 claims abstract description 14
- 238000006073 displacement reaction Methods 0.000 claims abstract description 6
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
Classifications
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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
-
- 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
- F04B49/20—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 by changing the driving speed
Abstract
The limit power control method of the electric chemical engineering machinery utilizes a control system to carry out limit power control, wherein the control system comprises a main pump, a motor, a frequency converter, a controller and a current transmitter; the main pump is connected with the motor, the motor is connected with the frequency converter and the current transducer, and the frequency converter and the current transducer are respectively connected with the controller; the motor is a variable frequency motor; when the control system is in a limit power mode, the frequency converter is used for converting the frequency of the motor to enable the working power supply frequency of the motor to be more than the power frequency, when the fact that the absorption power of the main pump is larger than the power of the motor is monitored, the displacement of the main pump is not reduced, the working frequency of the motor is reduced, the rotating speed of the main pump is reduced, and the absorption power is reduced to be matched with the power of the motor. The invention can change the control of the electric engineering machinery from the limit power which cannot be realized to the limit power which can be realized, and fully utilizes the power of the power machine; the pump under the control of the limiting power can be always in a high-efficiency state, and energy is saved.
Description
Technical Field
The invention belongs to the field of power matching control of engineering machinery, and particularly relates to a limit power control method of an electric chemical engineering machine.
Background
The engineering machinery uses a limit power control method in the power matching of the hydraulic pump and the power machine, so that the pump can fully utilize the power of the power machine. The power of the power machine is fully utilized, and the power machine is not stopped due to overload.
The engineering machinery is usually in a limiting power control mode in actual application, a pump used for limiting power control is a constant power variable pump, and among factors affecting pump efficiency, the displacement is the most remarkable factor, and the greater the displacement is, the higher the efficiency is. In the limiting power control mode, the main pump is in a displacement-reducing working state and cannot be in a high-efficiency state, and the heavier the load is, the more the efficiency is reduced.
With the worldwide increasingly tighter control of carbon emissions, a growing call is made for higher and higher levels of emissions, and the trend of oil-burning vehicles and machines exiting the market is irreversible, and a variety of electric engineering machines have been developed in the industry. In the motorized application of engineering machinery in industry, the pump and the motor are matched to use the motor from the rated power frequency to the descending frequency, so that the motor is better matched and better controlled, and is a method which is always used by people, but the motor works below the rated power, and the real limit power control cannot be realized to fully utilize the motor power.
Disclosure of Invention
The invention mainly aims to provide a limit power control method of an electric chemical engineering machine, and aims to solve the technical problems.
In order to achieve the above purpose, the present invention provides a method for controlling the limiting power of an electric chemical engineering machine, wherein a control system is used for controlling the limiting power, and the control system comprises a main pump, a motor, a frequency converter, a controller and a current transmitter; the main pump is connected with the motor, the motor is connected with the frequency converter and the current transducer, and the frequency converter and the current transducer are respectively connected with the controller; the motor is a variable frequency motor;
when the control system is in a limit power mode, the frequency converter is used for converting the frequency of the motor to enable the working power supply frequency of the motor to be more than the power frequency, when the fact that the absorption power of the main pump is larger than the power of the motor is monitored, the displacement of the main pump is not reduced, the working frequency of the motor is reduced, the rotating speed of the main pump is reduced, and the absorption power is reduced to be matched with the power of the motor.
Preferably, the motor is a variable frequency motor with a working frequency range including a frequency above the power frequency.
Preferably, the frequency-modulation range of the frequency converter comprises a frequency converter with frequency above the power frequency.
Preferably, the control method in the limit power control mode includes the steps of:
step a: the rated power of the main pump is selected to be larger than the rated power of the motor in the matching of the main pump and the motor, so that the main pump can fully utilize the power of the motor; the rated rotation speed of the main pump is larger than the rated rotation speed of the motor, and the number of the rotation speeds which are higher than the rated rotation speed of the motor only needs to meet the condition that the power of the main pump when working at the corresponding rotation speed of the power frequency voltage of the motor is lower than the power of the motor;
step b: setting the current of a main pump proportional electromagnetic valve according to the main pump and the motor characteristic curve, so that the main pump limiting power curve is higher than the rated power of the motor;
step c: determining the motor working frequency required when the main pump limiting power curve is higher than the motor power in a limiting power control mode according to the rotation speeds of the main pump and the motor;
step d: setting a working current range for control according to rated working current of the motor;
step e: monitoring the working current of the motor in real time, if the current is larger than the set working range, indicating that the real-time load exceeds the motor power, reducing the working frequency of the motor at the moment, reducing the absorption power of the main pump to the motor power, and reducing the working current to the set range; if the current is smaller than the set working range, the discharge capacity of the main pump is regulated to ensure that the absorption power of the main pump is increased to the power of the motor, and the working current is returned to the set range; if the current is within the set range, no adjustment is made.
In the control method, the motor working current is monitored to judge whether the motor load is light or heavy, and the motor working current is acquired and detected by the current transducer.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
(1) The invention utilizes the characteristic that the motor works at the power frequency above the power frequency and belongs to the constant power characteristic, and the motor works at the power frequency above the power frequency in the limit power control state, so that the motor always works at the maximum power, and the frequency is lowered when overload occurs, so long as the frequency is not lower than the power frequency, the maximum output power of the motor always keeps not lowered, and the load power is lowered, thereby ensuring that the motor power is fully utilized and the motor is not overloaded. If the load is light, the discharge capacity of the main pump is increased, so that the power of the main pump is increased to the power of the motor. When overload occurs, the downward frequency does not decrease the discharge capacity of the main pump, and the main pump always works at the maximum discharge capacity, so that the main pump is ensured to always work at a high-efficiency state.
(2) The invention can change the control of the electric engineering machinery from the limit power which cannot be realized to the limit power which can be realized, and fully utilizes the power of the power machine; the main pump under the control of limiting power can be always in a high-efficiency state, and energy sources are saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a control system according to the present invention;
fig. 2 is a flowchart of a control method in the limit power control mode according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a block diagram of a control system in the present invention is shown, which is a method for controlling the limit power of an electric chemical machine, wherein the control system shown in fig. 1 is used for controlling the limit power, and the control system comprises a main pump, a motor, a frequency converter, a controller and a current transmitter; the main pump is connected with the motor, the motor is connected with the frequency converter and the current transducer, and the frequency converter and the current transducer are respectively connected with the controller; the motor is a variable frequency motor; when the control system is in a limit power mode, the frequency converter is used for converting the frequency of the motor to enable the working power supply frequency of the motor to be more than the power frequency, when the fact that the absorption power of the main pump is larger than the power of the motor is monitored, the displacement of the main pump is not reduced, the working frequency of the motor is reduced, the rotating speed of the main pump is reduced, and the absorption power is reduced to be matched with the power of the motor. The motor is a variable frequency motor with a working frequency range comprising frequencies above the power frequency. The frequency converter is a frequency converter with a frequency modulation range comprising frequencies above the power frequency.
As shown in fig. 2, a flowchart of a control method in a limited power control mode in the present invention is shown, where the control method in the limited power control mode includes the steps of:
step a: the rated power of the main pump is selected to be larger than the rated power of the motor in the matching of the main pump and the motor, so that the main pump can fully utilize the power of the motor; the rated rotation speed of the main pump is larger than the rated rotation speed of the motor, and the number of the rotation speeds which are higher than the rated rotation speed of the motor only needs to meet the condition that the power of the main pump when working at the corresponding rotation speed of the power frequency voltage of the motor is lower than the power of the motor; specifically, the main pump parameters are selected to be 260kw and 1600rpm, and the variable frequency motor parameters are selected to be 250kw and 1490rpm.
Step b: setting the current of a main pump proportional electromagnetic valve according to the main pump and the motor characteristic curve, so that the main pump limiting power curve is higher than the rated power of the motor; specifically, the main pump proportional solenoid current was set to 600mA, and the pump limiting power was set to 255kw.
Step c: determining the motor working frequency required when the main pump limiting power curve is higher than the motor power in a limiting power control mode according to the rotation speeds of the main pump and the motor; specifically, according to the set main pump power, the rotation speed required by the main pump can be calculated to be 1570rpm by utilizing a pump power formula N= pqn eta/60, wherein N is the pump power, the unit kw is the pump outlet pressure, the unit Mpa is the pump discharge capacity, the unit L/r is the rotation speed, the unit r/min is the pump efficiency; then according to the motor rotation speed, the working frequency of the motor is 56Hz under the limit power state by using the formula n=60 f (1-s)/p; wherein n is the rotation speed, the unit r/min, f is the frequency, the unit Hz, s is the motor slip, and p is the motor pole pair number.
Step d: setting the working current range for control to be in the rated current accessories, specifically 339-446A, according to the rated working current 443A of the motor;
step e: monitoring the working current of the motor in real time through a current transducer, if the current is larger than the set working range, indicating that the real-time load exceeds the motor power, reducing the working frequency of the motor at the moment, reducing the absorption power of a main pump to the motor power, and reducing the working current to the set range; if the current is smaller than the set working range, the discharge capacity of the main pump is regulated to ensure that the absorption power of the main pump is increased to the power of the motor, and the working current is returned to the set range; if the current is within the set range, no adjustment is made.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather, the equivalent structural changes made by the description of the present invention and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (3)
1. A limit power control method of an electric chemical engineering machine is characterized in that: the limit power control is carried out by utilizing a control system, wherein the control system comprises a main pump, a motor, a frequency converter, a controller and a current transmitter; the main pump is connected with the motor, the motor is connected with the frequency converter and the current transducer, and the frequency converter and the current transducer are respectively connected with the controller; the motor is a variable frequency motor;
when the control system is in a limit power mode, the frequency converter is used for converting the frequency of a motor working power supply to enable the frequency of the motor working power supply to be more than the power frequency, when the fact that the absorption power of the main pump is larger than the motor power is monitored, the displacement of the main pump is not reduced, the working frequency of the motor is reduced, the rotating speed of the main pump is reduced, and the absorption power is reduced to be matched with the motor power; the control method in the limit power control mode includes the steps of:
step a: the rated power of the main pump is selected to be larger than the rated power of the motor in the matching of the main pump and the motor, and the rated rotating speed of the main pump is selected to be larger than the rated rotating speed of the motor;
step b: setting the current of a main pump proportional electromagnetic valve according to the main pump and the motor characteristic curve, so that the main pump limiting power curve is higher than the rated power of the motor;
step c: determining the motor working frequency required when the main pump limiting power curve is higher than the motor power in a limiting power control mode according to the rotation speeds of the main pump and the motor;
step d: setting a working current range for control according to rated working current of the motor;
step e: monitoring the working current of the motor in real time, and if the current is larger than the set working range, reducing the working frequency of the motor to reduce the absorption power of the main pump to the power of the motor; if the current is smaller than the set working range, the discharge capacity of the main pump is increased, so that the absorption power of the main pump is increased to the power of the motor; if the current is within the set range, no adjustment is made.
2. The method for limiting power control of an electric chemical machine according to claim 1, wherein: the motor is a variable frequency motor with a working frequency range comprising frequencies above the power frequency.
3. The method for limiting power control of an electric chemical machine according to claim 1, wherein: the frequency converter is a frequency converter with a frequency modulation range comprising frequencies above the power frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210164202.4A CN114396375B (en) | 2022-02-22 | 2022-02-22 | Limiting power control method of electric chemical engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210164202.4A CN114396375B (en) | 2022-02-22 | 2022-02-22 | Limiting power control method of electric chemical engineering machinery |
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| Publication Number | Publication Date |
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| CN114396375A CN114396375A (en) | 2022-04-26 |
| CN114396375B true CN114396375B (en) | 2023-12-22 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101818508A (en) * | 2010-04-19 | 2010-09-01 | 三一重机有限公司 | Power control system and method of excavator |
| EP2544349A1 (en) * | 2011-07-08 | 2013-01-09 | Siemens Aktiengesellschaft | Management of a frequency converter on a conveyor assembly |
| CN104003305A (en) * | 2014-05-26 | 2014-08-27 | 徐工集团工程机械股份有限公司 | Matching method and device of crane pump control system threshold power |
| CN106436810A (en) * | 2016-10-28 | 2017-02-22 | 贵州詹阳动力重工有限公司 | Excavator power matching method and system |
| EP3644497A1 (en) * | 2018-10-24 | 2020-04-29 | GE Energy Power Conversion Technology Ltd. | Method and device for virtual inertia control for power stations with double-fed asynchronous machine |
-
2022
- 2022-02-22 CN CN202210164202.4A patent/CN114396375B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101818508A (en) * | 2010-04-19 | 2010-09-01 | 三一重机有限公司 | Power control system and method of excavator |
| EP2544349A1 (en) * | 2011-07-08 | 2013-01-09 | Siemens Aktiengesellschaft | Management of a frequency converter on a conveyor assembly |
| CN104003305A (en) * | 2014-05-26 | 2014-08-27 | 徐工集团工程机械股份有限公司 | Matching method and device of crane pump control system threshold power |
| CN106436810A (en) * | 2016-10-28 | 2017-02-22 | 贵州詹阳动力重工有限公司 | Excavator power matching method and system |
| EP3644497A1 (en) * | 2018-10-24 | 2020-04-29 | GE Energy Power Conversion Technology Ltd. | Method and device for virtual inertia control for power stations with double-fed asynchronous machine |
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| Publication number | Publication date |
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| CN114396375A (en) | 2022-04-26 |
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