CN101844725A - Line voltage drop automatic detection control method for hoisting machinery - Google Patents
Line voltage drop automatic detection control method for hoisting machinery Download PDFInfo
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Abstract
The invention discloses a line voltage drop automatic detection control method for hoisting machinery, which comprises the following steps of: inputting critical working voltage at the direct current end of a variable frequency speed control system, and the maximum speed and minimum speed allowed by the variable frequency speed control system when the critical working voltage is reached, and setting a plurality of comparison speed values between the maximum speed and the minimum speed; in the running process of the hoisting machinery, comparing the acquired real-time voltage with the critical working voltage by a voltage data processing control module; and if the real-time voltage is equal to the critical working voltage, comparing the real-time speed with the plurality of comparison speed values by a speed control module, and outputting a comparison speed value smallest different from the real-time speed to the variable frequency speed control system, and using the comparison speed value as a speed-limiting speed value of a motor. The method solves the problems that low voltage is caused by line voltage drop, the running mode of the variable frequency speed control system cannot be automatically adjusted, and an electric governor system is ensured not to be damaged by sacrificing the service life of the variable frequency speed control system in the conventional variable frequency speed control system.
Description
Technical field
The present invention relates to a kind of voltage of system drop automatic detection control method of elevator machinery.
Background technology
At present, domestic each harbour adopts " oil changes " technology to solve the high energy consumption that diesel motor brings one after another, expensive, high pollution, strong noise, shortcomings such as maintenance is big, promptly substitute the power that former diesel motor group provides with the civil power of the three-phase four-wire system mode by overhead slide wire power supply, tyre crane is a kind of elevator machinery that extensively is used in the harbour handling freight container, the mechanism of former main outfit is: diesel motor, electrical generator, the speed governing electric-control system, mechanical drive system, brake system, instruction repertoire, feedback system etc., after " oil changes " technology of employing, removed diesel motor, electrical generator is powered by overhead trolley with civil power.The defective that this elevator machinery exists is, when being in the adjacent position away from supply transformer or two tyre cranes and during from supply transformer operation far away, electric current during its operation produces loss in voltage on long circuit, the operating voltage of speed governing electric-control system is sharply descended, thereby bring great negative effect.For example; mainly comprise PLC control module, frequency conversion speed-adjusting system and motor, voltage detection module and emergency protection module etc. for existing speed governing electric-control system; wherein frequency conversion speed-adjusting system adopts day 686CR5 frequency conversion speed-adjusting system of intrinsic safety river electric corporation production; the PLC control module is made up of load operation floor data processing module, current feedback module, director data processing module, rate control module and velocity feedback module, as shown in Figure 1.After providing the instruction that hoists; make motor M work by director data processing module, rate control module, if the three phase mains of frequency conversion speed-adjusting system passes through voltage detection module because of certain factor causes low voltage; start emergency protection mechanism, make it to quit work.Be easy to find out that this speed governing electric-control system has the defencive function of voltage detecting, but can not change the operation scheme of frequency conversion speed-adjusting system that the factor that can not make reason influence low voltage obtains changing.
Existing speed governing electric-control system produces the reason of low voltage:
1) power supply resource scarcity.Seasonal peak of power consumption or power supply capacity be less than generating capacity, and generally speaking, power transformer is operated under the situation of 50%～70% degree of utilization preferable, exceeds time of voltage transformer rated capacity or opportunity more for a long time at the capacity of installation equipment operation; Seasonal weather extreme temperature, regional power equipment supply fault and can produce pressure drop when causing shortage of electric power.
2) supply line is long.The resulting impedance of supply line goes beyond the scope, and loss in voltage is excessive.
3) load is too concentrated.In the practical application, " oil changes " tyre crane contacts with the copper slip by current-collecting device and is subjected to, 1220 meters of copper slip length overalls adopt the three-phase and four-line power supply, and the power transformer that is equipped with 10000 volts/460 volts in a cover about 400 meters of every spacings between 1220 meters is powered to trolley.Be provided with 3～4 " oil changes " tyre cranes between 1220 meters copper slips of length overall road and carry out operation, hang as 2 or more wheels and to draw close mutually and from the voltage transformer larger distance, when playing the hanging freight container simultaneously, will produce the electric current about 800 amperes, flowing to its 2 chaptrel by transformer terminal hangs, if voltage transformer distance 2 chaptrels hang 100 meters, the electric current that flows through on this section copper slip about 800 amperes just is enough to make it to produce sizable loss in voltage, make 2 chaptrels hang the very fast decay of voltage of the input end of variable-frequency governor, can in 2 seconds, drop to about 390 volts by 460 volts.
When if voltage is reduced to the set critical voltage value of frequency conversion speed-adjusting system; generation is together with the protection action of PLC control module sudden power; though be the power-off protection action; be the service life of having sacrificed vigour part, frequency conversion speed-adjusting system in fact; exchange for and guarantee that the speed governing electric-control system is not damaged; so its harm is to bring impact to elevator machinery, directly influence the service life of elevator machinery.
Summary of the invention
Technical matters to be solved by this invention is: at the defective that exists in the prior art, a kind of operation scheme of energy actv. control frequency conversion speed-adjusting system is provided, make the motor of acceleration reduce to the eve that allows critical range at voltage, no longer quicken, keep at that time instantaneous velocity and make elevator machinery supply line voltage no longer toward the automatic detection control method that descends.
The present invention is achieved like this:
A kind of voltage of system drop automatic detection control method of elevator machinery comprises the steps:
1) in the initialization procedure, the critical operating voltage U of input frequency conversion speed-adjusting system dc terminal
CriticalAnd reach critical operating voltage U
CriticalThe time, the maximum speed V that frequency conversion speed-adjusting system allowed
MaxWith minimum velocity V
Min, and at maximum speed V
MaxWith minimum velocity V
MinBetween set several relatively velocity amplitudes;
2) in the elevator machinery operational process, voltage detection module is with the instant voltage U of the frequency conversion speed-adjusting system dc terminal that collects
ImmediatelyOutput to the voltage data processing and control module, the voltage data processing and control module is with instant voltage U
ImmediatelyWith critical operating voltage U
CriticalRelatively; If equal critical operating voltage U
Critical, the instantaneous velocity V that rate control module collects the velocity feedback module
ImmediatelyWith several relatively velocity amplitudes compare respectively, will with instantaneous velocity V
ImmediatelyOne of difference minimum velocity amplitude V relatively
RelativelyOutput to frequency conversion speed-adjusting system, want the velocity amplitude of speed limit as motor.
Comprising also in the initialization procedure that the input frequency conversion speed-adjusting system hoists quickens the required time S2 of transient process; In the elevator machinery operational process, handle, obtain the instant voltage U of frequency conversion speed-adjusting system dc terminal by the voltage data processing and control module
ImmediatelyBegin to drop to and reduce to critical operating voltage U
CriticalThe time S1 of Shi Suoxu quickens the required time S2 of transient process as if hoisting less than frequency conversion speed-adjusting system, then carries out above-mentioned steps (2).
Critical operating voltage U
CriticalComprise actual critical voltage and well-to-do value.
The instant voltage U of frequency conversion speed-adjusting system dc terminal
ImmediatelyBegin to drop to and reduce to critical operating voltage U
CriticalThe time required time S1 method of measurement as follows:
1) by the instant voltage U in a certain moment
ImmediatelyTo critical operating voltage U
CriticalVoltage difference draw the voltage change ratio of frequency conversion speed-adjusting system dc terminal per second kind, promptly one second voltage variety;
2) by the instant voltage U in a certain moment
ImmediatelyTo critical operating voltage U
CriticalVoltage difference obtain the instant voltage U in a certain moment than the voltage change ratio of last synchronization
ImmediatelyTo critical operating voltage U
CriticalThe time needed time S1.
Its principle of work is as follows:
According to the relation of motor speed and loss in voltage, the size of loss in voltage is by the decision of the size of motor speed increment, that is to say that motor quickens the length of transient process, i.e. revolution increase has determined the size of loss in voltage.(zero-speed) beginning is progressively quickened from hoisting, to quickening end, if the loss in voltage factor exists during the course, then in accelerator, have dynamic loss in voltage and exist, be i.e. voltage decay thereupon with the increase of quickening variable, the dynamic process of this voltage attenuation certainly will finish along with the end of accelerator, that is to say,, will make the voltage that is descending stop to decay and the magnitude of voltage of maintenance system when stopping to quicken as long as make frequency conversion speed-adjusting system stop accelerator.Therefore can be with from beginning to produce voltage required time S1 when dropping to loss in voltage to the eve that allows the operating range transformation point, hoist with frequency conversion speed-adjusting system and to quicken the required time S2 of transient process and compare, this S2 value has existed in the original PLC control module.If S1＞S2, then voltage drops to the eve of critical operating voltage, and frequency conversion speed-adjusting system hoists and quickens transient process and finish, and promptly motor no longer quickens this moment, and loss in voltage just can not go beyond the scope yet; If S1＜S2, when then voltage dropped to the eve of critical operating voltage, frequency conversion speed-adjusting system hoisted and quickens also end of transient process, and then account for voltage is fallen and had off-limits possibility, if keep its original assisted instruction, then may exceed critical operating voltage.The instant voltage U that in the voltage data processing and control module, compares the frequency conversion speed-adjusting system dc terminal
ImmediatelyWith critical operating voltage U
CriticalIf, U
Immediately≤ U
Face, be about to this instantaneous velocity constantly and pass through the velocity feedback module in rate control module, and output to frequency conversion speed-adjusting system.Certainly, also can directly carry out the instant voltage U of frequency conversion speed-adjusting system dc terminal
ImmediatelyWith critical operating voltage U
CriticalComparison.
The invention has the beneficial effects as follows:
The voltage of system drop automatic detection control method of a kind of elevator machinery of the present invention, the instant voltage and the critical voltage of the frequency conversion speed-adjusting system dc terminal of collection compare in real time with voltage detection module by the voltage data processing and control module, when instant voltage during near critical voltage, rate control module can be outputed to the instantaneous velocity in the velocity feedback module in the frequency conversion speed-adjusting system by actv., change the acceleration operation scheme of frequency conversion speed-adjusting system, the instant voltage of frequency conversion speed-adjusting system dc terminal can not surpassed at critical voltage, prolong the service life of elevator machinery, saved the maintenance cost of equipment.
The invention will be further described below in conjunction with drawings and Examples.
Description of drawings
Fig. 1 is the logical schematic of the speed governing electric-control system of existing elevator machinery.
Fig. 2 is the logic diagram of the line drop automatic gauging control of elevator machinery in the utility model.
The specific embodiment
According to Fig. 2, the voltage of system drop automatic detection control method of a kind of elevator machinery of the utility model on the basis of the PLC of original Fig. 1 control module, has increased a voltage data processing and control module.Wherein:
1) director data processing module.Send instructions by operating personal, the coder that makes the and instruction handle connect joystick produces a displacement, this coder is just exported a control command signal, convert this signal to controlled hexadecimal system control command through user program by the PLC Control Software, control program through PLC, call corresponding speed control data, send into rate control module.
2) load operation floor data processing module.Mainly be based on the method for control computing, when hoisting operation, in initial 0.5 second, current signal by wire rope transfers is carried out the computing of 50 times/second electric current variation, utilize the coefficient of ratio (1800/750) * 100, do the concrete analysis of changes in weight, then again operation result is sent to rate control module with data mode.
3) rate control module.By director data handle, the concrete analysis of changes in weight, velocity feedback aggregation of data together, concentrate computing, processing, so signal of rate control module output, be the speed signal that frequency conversion speed-adjusting system can be used, the data through voltage data processing, control of this patent research, the speed signal that can select rate control module to export automatically reaches this purpose of controlling motor speed.
Embodiment
1, voltage signal is converted into the controlled digital signal of PLC.
Agreement: the register address that this patent relates to, data converted, the note of sheerly giving an example is for convenience write, and the user can oneself be provided with definite.
The PLC control module can will be in the frequency conversion speed-adjusting system dc terminal detected voltage data, send in the word address of PLC register, need not to increase in addition voltage check device and relevant PLC load module, exchange end or the detected voltage data of dc terminal by frequency conversion speed-adjusting system, voltage data in the input register word address, it must be converted into the voltage form by data format, input word register address herein is IW907, content wherein is the magnitude of voltage of dc terminal, expression-form is a data format, the expression formula that is converted into the voltage form is: IW907 * 800 ÷ 10000, its meaning, data format are 0----10000, and corresponding voltage is 0---800V, obviously working as the IW907 content is 10000, substitution formula, then expressed voltage are 800V, when the IW907 content is 5000, then expressed voltage is 400V, and result of calculation is sent into DW00020 in the subprogram word register.
2, according to the instant voltage of a certain moment frequency conversion speed-adjusting system dc terminal voltage difference (U to critical voltage
Immediately-U
Critical) draw the voltage change ratio of dc terminal per second kind, promptly one second voltage variety.
Next the voltage data that each scanning period is gathered is sent in the subprogram word register, method: define 19 word registers, at first will accomplish to power on can be automatically to defined 19 word register zero clearings in the program after the several seconds, when the PLC control module is carried out each cycle of program scanning subsequently, successively the voltage data of 19 collections is sent into 19 word registers, data in 19 word registers are added up, remove again in 19, draw the data of stored magnitude of voltage in the average word register, data with the magnitude of voltage in first or last word register of 19 word registers, deduct first word register before of 19 word registers or the data of the magnitude of voltage in the word register after last word register, draw the variable quantity of voltage in a scanning period.
According to a second there being several scanning periods, draw the variable quantity/per second of voltage again.
3, voltage difference during to critical voltage and last one constantly the ratio (U of voltage change ratio according to the instant voltage of the frequency conversion speed-adjusting system dc terminal in a certain moment
Immediately-U
Critical)/voltage variety/second, draw the instant voltage U of the frequency conversion speed-adjusting system dc terminal in a certain moment
ImmediatelyBegin to drop to and reduce to critical voltage U
CriticalThe time S1 of Shi Suoxu.
If critical voltage is controlled at the positive and negative 7% of normal voltage value, that is just by the instant magnitude of voltage U of ccasual
ImmediatelyDeduct negative 7% critical voltage value U of normal voltage value
Critical, that is: negative 7% of the instant magnitude of voltage of ccasual-normal voltage value critical voltage value U among the DW00020 in the word register
CriticalVoltage difference (the U of the dc terminal voltage in=a certain moment during to critical voltage
Immediately-U
Critical), critical voltage value U in the present embodiment
CriticalBe 557.The instant voltage of dc terminal is deducted critical voltage (U
Immediately-U
Critical) remove in the variable quantity/per second of voltage, drawing, magnitude of voltage at that time descends in the mode of decay, and the time S1 that is experienced during to critical voltage sends into these data among the word register DW00023.
4, the frequency conversion speed-adjusting system among time S1 and the word register MW00400 is hoisted quicken the required time S2 of transient process relatively, as S1＜S2, judge then whether the instant voltage of dc terminal reduces to critical operating voltage among the word register DW00020, the critical operating voltage of this moment should be critical voltage and well-to-do value sum, if then send the speed limit instruction.
5, under the situation according to actual field voltage fluctuation, load, determine the collection of minimum velocity and maximum speed value.
Make the load that will move from supply transformer place farthest, can make several loads operation at this point simultaneously in case of necessity, purpose is to allow its voltage descend fast, with the maximum speed instruction operation, observe the value of voltage and speed simultaneously, when voltage drops to critical voltage value, record minimum velocity value at this moment.Make the load that will move progressively approach supply transformer again, number will surpass and maximum speed value when surpassing motor acceleration transient process required time record used second when voltage drops to critical voltage value.On the basis of this minimum velocity and maximum speed, insert several velocity amplitudes as a comparative figure.
6, how many velocity amplitudes of definite speed limit of wanting is.
When the word register address is the well-to-do value of numerical value≤557+ among the DW00020, by the PLC control module, find to deposit and be transferred to instantaneous velocity value in the word register address by the velocity feedback module, compare with the above-mentioned comparative figure of mentioning, when the value of being compared---the instantaneous velocity value equates that with comparative figure then wanting the value of speed limit this moment is exactly the speed of this comparative figure.Obviously intensive more when the data of gathering, the effect of its speed limit is just good more, accurate more, sees that the data of feedback instantaneous velocity value equal the velocity amplitude data of which section collection in worksite, just with the upper limit of this section speed value as qualification.
7, field adjustable
Because when voltage was reduced to the transformation point of critical operating voltage, the rotating speed to motor output shaft was achieved, its process need has the regular hour, and therefore well-to-do value is set.
The present invention can produce by using for reference this paper disclosure all combinations and method open and that disclose, although combination of the present invention and method are described by detailed implementation process, but those skilled in the art obviously can be spliced the described method and apparatus of the application in not breaking away from content of the present invention, spirit and scope or change, or increase and decrease some parts, more particularly, the replacement that all are similar and change apparent to those skilled in the artly, they are regarded as being included among spirit of the present invention, scope and the content.
Claims (4)
1. the voltage of system drop automatic detection control method of an elevator machinery comprises the steps:
1) in the initialization procedure, the critical operating voltage U of input frequency conversion speed-adjusting system dc terminal
CriticalAnd reach critical operating voltage U
CriticalThe time, the maximum speed V that frequency conversion speed-adjusting system allowed
MaxWith minimum velocity V
Min, and at maximum speed V
MaxWith minimum velocity V
MinBetween set several relatively velocity amplitudes;
2) in the elevator machinery operational process, voltage detection module is with the instant voltage U of the frequency conversion speed-adjusting system dc terminal that collects
ImmediatelyOutput to the voltage data processing and control module, the voltage data processing and control module is with instant voltage U
ImmediatelyWith critical operating voltage U
CriticalRelatively; If equal critical operating voltage U
Critical, the instantaneous velocity V that rate control module collects the velocity feedback module
ImmediatelyWith several relatively velocity amplitudes compare respectively, and will with instantaneous velocity V
ImmediatelyOne of difference minimum velocity amplitude V relatively
RelativelyOutput to frequency conversion speed-adjusting system, want the velocity amplitude of speed limit as motor.
2. according to the voltage of system drop automatic detection control method of the described elevator machinery of claim 1, it is characterized in that: comprising also in the initialization procedure that the input frequency conversion speed-adjusting system hoists quickens the required time S2 of transient process; In the elevator machinery operational process, handle, obtain the instant voltage U of frequency conversion speed-adjusting system dc terminal by the voltage data processing and control module
ImmediatelyBegin to drop to and reduce to critical operating voltage U
CriticalThe time S1 of Shi Suoxu, and, then carry out above-mentioned steps (2) as if the required time S2 of acceleration transient process that hoists less than frequency conversion speed-adjusting system.
3. according to the voltage of system drop automatic detection control method of claim 1 or 2 described elevator machineries, it is characterized in that: critical operating voltage U
CriticalComprise actual critical operating voltage and well-to-do value.
4. according to the voltage of system drop automatic detection control method of the described elevator machinery of claim 2, it is characterized in that: the instant voltage U of frequency conversion speed-adjusting system dc terminal
ImmediatelyBegin to drop to and reduce to critical operating voltage U
CriticalThe time required time S1 method of measurement as follows:
1) by the instant voltage U in a certain moment
ImmediatelyTo critical operating voltage U
CriticalVoltage difference draw the voltage change ratio of frequency conversion speed-adjusting system dc terminal per second kind, promptly one second voltage variety;
2) by the instant voltage U in a certain moment
ImmediatelyTo critical operating voltage U
CriticalVoltage difference obtain the instant voltage U in a certain moment than the voltage change ratio of last synchronization
ImmediatelyTo critical operating voltage U
CriticalThe time needed time S1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101839400A CN101844725B (en) | 2010-05-25 | 2010-05-25 | Line voltage drop automatic detection control method for hoisting machinery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101839400A CN101844725B (en) | 2010-05-25 | 2010-05-25 | Line voltage drop automatic detection control method for hoisting machinery |
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| CN101844725B CN101844725B (en) | 2012-07-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102586754A (en) * | 2012-03-06 | 2012-07-18 | 山东国晶新材料有限公司 | Method for preparing pyrolytic boron nitride crucible easy to demould |
| CN108153221A (en) * | 2017-11-24 | 2018-06-12 | 赤湾集装箱码头有限公司 | A kind of universal computer that container flowing loading mechanization control is realized based on PLC |
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| CN2632937Y (en) * | 2003-08-01 | 2004-08-11 | 长春时代机电新技术有限公司 | Voltage and frequency variable speed adjuster of high voltage motor |
| CN101123412A (en) * | 2007-08-28 | 2008-02-13 | 山西合创电力科技有限公司 | Integrated method for vector control of induction electromotor frequency conversion under voltage and direct toque control |
| CN201256357Y (en) * | 2008-07-24 | 2009-06-10 | 鸿松精密科技股份有限公司 | Compensation device for output voltage |
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2010
- 2010-05-25 CN CN2010101839400A patent/CN101844725B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1171652A (en) * | 1996-04-01 | 1998-01-28 | 亚瑞亚·勃朗勃威力有限公司 | Method and apparatus for direct torque control of induction machine |
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| CN102586754A (en) * | 2012-03-06 | 2012-07-18 | 山东国晶新材料有限公司 | Method for preparing pyrolytic boron nitride crucible easy to demould |
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| CN108153221A (en) * | 2017-11-24 | 2018-06-12 | 赤湾集装箱码头有限公司 | A kind of universal computer that container flowing loading mechanization control is realized based on PLC |
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| CN101844725B (en) | 2012-07-25 |
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Owner name: SHANGHAI MINGDONG CONTAINER TERMINALS CO., LTD. Free format text: FORMER OWNER: XU WEIXIN Effective date: 20101216 |
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Inventor after: Zhuo Fangqing Inventor after: Chen Anping Inventor after: Xu Weixin Inventor after: Cao Shenhai Inventor before: Xu Weixin |
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Free format text: CORRECT: INVENTOR; FROM: XU WEIXIN TO: ZHUO FANGQING CHEN ANPING XU WEIXIN CAO SHENHAI Free format text: CORRECT: ADDRESS; FROM: 200940 ROOM 501, NO. 70, HAIBIN VILLAGE 3, BAOSHAN DISTRICT, SHANGHAI TO: 200137 NO. 999, GANGJIAN ROAD, PUDONG NEW DISTRICT, SHANGHAI |
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Effective date of registration: 20101216 Address after: 200137 No. 999, Jian Qiao Road, Pudong New Area, Shanghai Applicant after: SHANGHAI MINGDONG CONTAINER TERMINALS Ltd. Address before: 501, room 70, three village, Haibin 200940, Shanghai, Baoshan District Applicant before: Xu Weixin |
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Granted publication date: 20120725 |