CN205136018U - Air compressor economizer system based on PID frequency conversion - Google Patents
Air compressor economizer system based on PID frequency conversion Download PDFInfo
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- CN205136018U CN205136018U CN201520895575.4U CN201520895575U CN205136018U CN 205136018 U CN205136018 U CN 205136018U CN 201520895575 U CN201520895575 U CN 201520895575U CN 205136018 U CN205136018 U CN 205136018U
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Abstract
The utility model provides an air compressor economizer system based on PID frequency conversion, include: a set of air compressor system, by the converter of the PID program module among PLC control system control, the output and person in charge's net gas tank connection a, pressure sensor of air compressor system are used for detecting the current output gross pressure value of the air compressor system that should organize to feed back the PID program module to the PLC control system in with exporting the gross pressure value present, each air compressor in the air compressor system is connected, is connected with power frequency power supply through the power frequency contactor respectively through frequency conversion contactor and converter respectively, PID program module among the PLC control system makes an air compressor job in the air compressor system is worked in the power frequency mode at frequency conversion mode, remaining air compressor to the real -time aggregate capacity of publishing books of adjusting makes air compressor's output aggregate capacity maintain a roughly scope of invariant.
Description
Technical field
The utility model relates to a kind of energy conserving system of air compressor.
Background technique
At glass industry, the requirement of production gas to compressed-air actuated pressure and flow is high, and air compressor plant is the place of float glass gas and air feed.In air compressor plant, air compressor is the capital equipment of gas processed and air feed.In recent years, along with formula air compressor is in the large-scale application of industrial and mining enterprise, its energy consumption accounts for very large proportion in the daily consumption of enterprise.Air compressor efficiency is in actual use low, and the air compressor utilization efficiency of most of industrial enterprise, between 60% to 70%, causes that energy loss is many, maintenance cost is high.
Air compressor runs not energy-conservation reason 2 points: one is that type selecting is unreasonable, causes allowance excessive; Two are common air compressors is on-off control machines, and the gas consumption of user is not constant, in order to ensure the constant of air compressor outlet header pressure, air compressing chance is constantly by loading, unloading the pressure regulating air compressor, cause house steward's air supply pressure fluctuation large, the demand of user can not be met.
For stable manifold pressure, reduce the fluctuation of air feed tolerance, user only has by the emptying long time loading operation realizing air compressor.Formula air compressor in use will cause a large amount of wastes, too increases the maintenance cost of equipment simultaneously.
Model utility content
Technical problem underlying to be solved in the utility model is to provide a kind of power-economizing method of air compressor, the output power of a compressor in air compressor unit is regulated by frequency variator, thus make the output total output of air compressor can realize real-time adjustment, the output total output of air compressor is maintained in the scope of a constant.
In order to solve above-mentioned technical problem, the utility model provides a kind of air compressor energy conserving system based on PID variable frequency adjustment, comprising: one group of air compressor system, the frequency variator controlled by the PID program module in PLC control system;
The output terminal of described air compressor system is connected with supervisor's net gas holder, and current output stagnation pressure force value for detecting this group air compressor system current output stagnation pressure force value, and is fed back to the PID program module in PLC control system by a pressure transducer;
Each air compressor in described air compressor system to be connected with frequency variator respectively by frequency conversion contactor and to be connected with power frequency supply respectively by power frequency contactor; PID program module in described PLC control system makes in described air compressor system air compressor be operated in variable mode, and remaining air compressor is operated in power frequency pattern.
In a preferred embodiment: the PID program module in described PLC control system connects a man-machine interaction interface, by man-machine interaction interface, one target is inputted to PID program module and export stagnation pressure force value.
In a preferred embodiment: between described air compressor and frequency conversion contactor, adopt hardwire electrical interlocks.
In a preferred embodiment: described frequency variator also adjusts the rotating speed of the asynchronous motor of the air compressor being operated in variable mode according to the magnitude relationship that the current output stagnation pressure force value of this group air compressor and target export stagnation pressure force value, thus changes the delivery pressure value that this is operated in the air compressor of variable mode.
In a preferred embodiment: when described target export stagnation pressure force value be greater than this group air compressor current output total pressure time, frequency variator makes the rotating speed of the asynchronous motor of the air compressor being operated in variable mode raise, and then its delivery pressure value is raised, the current output total pressure of this group air compressor also increases;
When described target export stagnation pressure force value be less than this group air compressor current output total pressure time, frequency variator makes the rotating speed of the asynchronous motor of the air compressor being operated in variable mode reduce, and then its delivery pressure value is reduced, the current output total pressure of this group air compressor also decreases.
Compared to prior art, the technical solution of the utility model possesses following beneficial effect:
(1) power savings is obvious.According to the power consumption statistics before and after use VFC, before use VFC, on average every day, power consumption was 7781 degree to the air compressor of 355KW, and after use VFC, on average every day, power consumption was 4400 degree, and after using VFC, the odd-numbered day saves power consumption is 3381 degree.Calculate according to the average electricity price 0.73 yuan/degree of south electric network, the air compressor reducing energy consumption of company every year can power cost saving 90.08 ten thousand yuan.
(2) supply gas pressure is stablized.Adopt the PID shaping modes that PLC controls, system regulates the operation frequency of frequency variator automatically according to the pressure that pressure transducer feeds back, and controls the output tolerance of air compressor, ensure that the stable of supply gas pressure.
(3) equipment loss is reduced.The long-time underfrequency of air compressor is run, and reduces air compressor rotating speed, avoid simultaneously the air compressor when power frequency operation be balance ductwork pressure carry out add unloading frequently, decrease equipment attrition, saved maintenance cost.
(4) cranking current pulse is decreased.Adopt the mode of varying frequency starting, reduce inrush current, compare star delta reduced-voltage starting, native system decreases the impact of starting current to system to greatest extent.
Accompanying drawing explanation
Fig. 1 is the air compressor energy conserving system schematic diagram based on PID variable frequency adjustment in the utility model preferred embodiment.
Embodiment
Hereafter with specific embodiment, the utility model is described further by reference to the accompanying drawings.
With reference to figure 1, a kind of air compressor energy conserving system based on PID variable frequency adjustment, comprising: one group of air compressor system, the frequency variator controlled by the PID program module in PLC control system; In the present embodiment, described one group of air compressor system comprises two screw air compressors.
The output terminal of described screw air compressor system is connected with supervisor's net gas holder, current output stagnation pressure force value for detecting this group screw air compressor system current output stagnation pressure force value, and is fed back to the PID program module in PLC control system by one pressure transducer;
Two screw air compressors in described screw air compressor system are connected with frequency variator respectively by frequency conversion contactor, adopt hardwire electrical interlocks between described screw air compressor and frequency conversion contactor.Two screw air compressors are also connected with power frequency supply respectively by power frequency contactor; PID program module in described PLC control system makes a screw air compressor in described screw air compressor system be operated in variable mode, and another air compressor is operated in power frequency pattern.
PID program module in described PLC control system connects a man-machine interaction interface, inputs a target export stagnation pressure force value by man-machine interaction interface to PID program module.
The principle of variable frequency adjustment is as follows: described frequency variator also adjusts the rotating speed of the asynchronous motor of the screw air compressor being operated in variable mode according to the magnitude relationship that the current output stagnation pressure force value of this group air compressor and target export stagnation pressure force value, thus changes the delivery pressure value that this is operated in the screw air compressor of variable mode.
Specifically: when described target export stagnation pressure force value be greater than this group air compressor current output total pressure time, frequency variator makes the rotating speed of the asynchronous motor of the screw air compressor being operated in variable mode raise, and then its delivery pressure value is raised, the current output total pressure of this group screw air compressor also increases;
When described target export stagnation pressure force value be less than this group air compressor current output total pressure time, frequency variator makes the rotating speed of the asynchronous motor of the screw air compressor being operated in variable mode reduce, and then its delivery pressure value is reduced, the current output total pressure of this group screw air compressor also decreases.
Why pass through the rotating speed that adjustment is operated in the asynchronous motor of the screw air compressor of variable mode, just can change this delivery pressure value being operated in the screw air compressor of variable mode be because: screw air compressor belongs to constant torque load, the rotating speed of its output power and asynchronous motor is linear, and its derivation formula is as follows:
According to mechanics principle, tensile force f and frictional force f equal and opposite in direction, direction are contrary, and F pulls object to do straight line motion in unit time t, and displacement is s.So the work of F in unit time t is P:
Friction formula f=μ Fn is substituted into formula 1 can obtain:
P=μ F
nν (formula 2)
Note: μ is the coefficient of sliding friction, and Fn is the positive pressure between the object of generation friction.
Relation according to linear velocity ν and angular velocity omega can obtain following formula:
ν=ω ρ=2 π fr (formula 3)
Note: in formula 3, f is the speed of solid of rotation.
Formula 3 is substituted into formula 2 and can obtain following formula:
P=μ F
nν=μ F
nω r=μ F
n2 π rf (formula 4)
Can draw by formula 4, between screw air compressor rotor, overcome friction at the uniform velocity rotates, and motor needs the mechanical output provided to calculate (ignoring mechanical efficiency η loss, if η is 1) by formula 4.
To sum up, can be similar to think the output power P of screw type screw air compressor and screw air compressor electric machine frequency linear.Therefore, the rotating speed n changing screw air compressor asynchronous motor can change the output power of screw air compressor, thus controls compressed-air actuated output flow and pressure, thus reaches energy-conservation object.And frequency variator has the ability of stepless time adjustment, its change of frequency and rotating speed linear, the rotating speed formula according to asynchronous motor:
In formula 5, n is motor asynchronous speed, and f is motor power frequency, and s is motor slip ratio, and P is motor number of pole-pairs.
After P and s determines, the output speed of motor and the power supply frequency of motor linear.Therefore change the output speed n that electric machine frequency just can change motor, thus realize frequency control of motor speed.
In order to maintain the constant of pressurized air main pipe pressure, PLC controls the output frequency of frequency variator by the data of detected pressures sensor feedback, reaches and be stabilized in the target that operator are inputted by man-machine interface to export stagnation pressure force value.Technician, by the programming to the PID program block of PLC inside, can realize this function.
Arranging correct pid parameter can make the frequency conversion speed-adjusting system of screw air compressor stablize, run efficiently.And PID control in a vital problem be scaling factor, the adjusting of intergration time and derivative time.Select there is the Siemens S7-200PLC of pid parameter Self-tuning System to realize the automatic speed regulation of frequency variator in this programme.
Siemens PLC programming software STEP7-Micro/WIN4.0 provides PIDWizard (PID instruction guide) guide, and user can be helped to generate the pid algorithm of a closed loop control process easily.This guide can complete the automated programming of most PID arithmetic, and user only need call the subroutine that guide PID generates in main program, and completes adjusting of PID controller parameter, just can complete the task that PID controls.
The program write is by after installing to PLC under upper-position unit, PLC is switched to the state of RUN, open PID control panel in programming software STEP7-Micro/WIN4.0, debug according to STEP7-Micro/WIN4.0 tendency chart that frequency in panel and actual pressure change and debug feedback in PID program block, output, the stablizing and PID speed of response of desired value.
When starting to debug, first start frequency variator, select manual tune pid parameter, the object of manual tune is mainly in order to avoid allowing system Self-tuning System at the very start, system may be adjusted unsuccessfully, so first select manually to adjust, each parameter is made to select pid parameter Self-tuning System again close to system Self-tuning System parameter.
1) first to adjust Proportional coefficient K
c, namely intergration time T
ifor INF, derivative time T
dbe 0, from 1.0, constantly increase K
cvalue, debug process in occur shake trend time, suitable reduction K
cvalue, until system stable output.
2) adjust intergration time T again
i, intergration time T
idetermine the rate of change of PID controller output frequency.Intergration time is too short, and the correction that the deviation of setting value and value of feedback obtains is faster; Intergration time is long, then controller is equivalent to do not have integral action.Therefore T intergration time is first set at tuning process
ibe 0, introduce a stronger integral action, make system produce vibration, or else disconnectedly increase intergration time, until system can eliminate static difference, make output not produce vibration, and tend towards stability.
3) adjust T derivative time on the basis of first two steps
d, the differential action is equivalent to the predictability adjustment to feedback change, if by T derivative time
dbe set to 0, PID controller is equivalent to do not have the differential action, therefore first by T
dadjust a larger value, allow export producing vibration, then reduce gradually, to find threshold oscillation value, dynamic performance is improved.
After Self-tuning System completes, the change of frequency converter frequency tends towards stability, and it exports with the frequency values error of feedback less, can meet the demand of production technology completely.
Native system possesses the function of hand/automatic switchover and power frequency/frequency conversion switching, and operator only need select corresponding function on the control panel.When 1# screw air compressor converting operation, 2# screw air compressor can only select power frequency operation, and vice versa.
System cloud gray model is when auto state, operator only the target needed for man-machine interface input need export stagnation pressure force value, PLC makes comparisons according to the pressure value that target output stagnation pressure force value and the pressure transducer of setting feed back and automatically regulates the frequency of frequency variator, inverter current in running, voltage and frequency feedback are shown correlation values and running state in man-machine interface in real time to PLC, PLC simultaneously.When a failure occurs, system analysis equipment is light fault or heavy fault, and during light fault, system can be reported to the police and record trouble information, and operator's announcement apparatus maintenance man overhauls and starts screw air compressor for subsequent use; The operation of system meeting arrestment while reporting to the police during heavy fault, operator start standby equipment immediately and notify that attendant overhauls.
To sum up, native system possesses higher redundancy performance, ensure that the continuous service of frequency conversion system, improves energy-saving efficiency, the Security that the equipment that simultaneously also ensure that runs.The employing of man-machine interface not only operates close friend, and easy to maintenance.
The above; be only the utility model preferably embodiment; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the change that can expect easily or replacement, all should be encompassed within protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claim.
Claims (5)
1. based on an air compressor energy conserving system for PID variable frequency adjustment, it is characterized in that comprising: one group of air compressor system, the frequency variator controlled by the PID program module in PLC control system;
The output terminal of described air compressor system is connected with supervisor's net gas holder, and current output stagnation pressure force value for detecting this group air compressor system current output stagnation pressure force value, and is fed back to the PID program module in PLC control system by a pressure transducer;
Each air compressor in described air compressor system to be connected with frequency variator respectively by frequency conversion contactor and to be connected with power frequency supply respectively by power frequency contactor; PID program module in described PLC control system makes in described air compressor system air compressor be operated in variable mode, and remaining air compressor is operated in power frequency pattern.
2. a kind of air compressor energy conserving system based on PID variable frequency adjustment according to claim 1, it is characterized in that: the PID program module in described PLC control system connects a man-machine interaction interface, by man-machine interaction interface, one target is inputted to PID program module and export stagnation pressure force value.
3. a kind of air compressor energy conserving system based on PID variable frequency adjustment according to claim 1, is characterized in that: adopt hardwire electrical interlocks between described air compressor and frequency conversion contactor.
4. a kind of air compressor energy conserving system based on PID variable frequency adjustment according to claim 2, it is characterized in that: described frequency variator also adjusts the rotating speed of the asynchronous motor of the air compressor being operated in variable mode according to the magnitude relationship that the current output stagnation pressure force value of this group air compressor and target export stagnation pressure force value, thus changes the delivery pressure value that this is operated in the air compressor of variable mode.
5. a kind of air compressor energy conserving system based on PID variable frequency adjustment according to claim 4, it is characterized in that: when described target export stagnation pressure force value be greater than this group air compressor current output total pressure time, frequency variator makes the rotating speed of the asynchronous motor of the air compressor being operated in variable mode raise, and then its delivery pressure value is raised, the current output total pressure of this group air compressor also increases;
When described target export stagnation pressure force value be less than this group air compressor current output total pressure time, frequency variator makes the rotating speed of the asynchronous motor of the air compressor being operated in variable mode reduce, and then its delivery pressure value is reduced, the current output total pressure of this group air compressor also decreases.
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| CN201520895575.4U CN205136018U (en) | 2015-11-11 | 2015-11-11 | Air compressor economizer system based on PID frequency conversion |
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| CN201520895575.4U CN205136018U (en) | 2015-11-11 | 2015-11-11 | Air compressor economizer system based on PID frequency conversion |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106050607A (en) * | 2016-07-20 | 2016-10-26 | 洛阳鸿泰半导体有限公司 | Energy-saving air compressor |
| CN106050634A (en) * | 2016-08-11 | 2016-10-26 | 福建景丰科技有限公司 | Air compressor group control system and control method thereof |
| CN106523340A (en) * | 2016-12-26 | 2017-03-22 | 广东艾高装备科技有限公司 | Broken line fault treatment system and method for pressure sensor of variable frequency air compressor |
| CN112128107A (en) * | 2020-08-06 | 2020-12-25 | 中煤第五建设有限公司 | Intelligent control system and method for air compressor |
| CN116581865A (en) * | 2023-07-13 | 2023-08-11 | 希望森兰科技股份有限公司 | Online undisturbed switching method and double-machine redundant high-voltage variable frequency system |
-
2015
- 2015-11-11 CN CN201520895575.4U patent/CN205136018U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106050607A (en) * | 2016-07-20 | 2016-10-26 | 洛阳鸿泰半导体有限公司 | Energy-saving air compressor |
| CN106050607B (en) * | 2016-07-20 | 2018-09-11 | 洛阳鸿泰半导体有限公司 | A kind of energy-saving air compressor |
| CN106050634A (en) * | 2016-08-11 | 2016-10-26 | 福建景丰科技有限公司 | Air compressor group control system and control method thereof |
| CN106523340A (en) * | 2016-12-26 | 2017-03-22 | 广东艾高装备科技有限公司 | Broken line fault treatment system and method for pressure sensor of variable frequency air compressor |
| CN106523340B (en) * | 2016-12-26 | 2019-10-08 | 广东艾高装备科技有限公司 | Frequency conversion air compressor pressure sensor disconnection fault processing system and method |
| CN112128107A (en) * | 2020-08-06 | 2020-12-25 | 中煤第五建设有限公司 | Intelligent control system and method for air compressor |
| CN116581865A (en) * | 2023-07-13 | 2023-08-11 | 希望森兰科技股份有限公司 | Online undisturbed switching method and double-machine redundant high-voltage variable frequency system |
| CN116581865B (en) * | 2023-07-13 | 2023-09-26 | 希望森兰科技股份有限公司 | Online undisturbed switching method and double-machine redundant high-voltage variable frequency system |
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