CN101581922A - Intelligent control method of generating equipment - Google Patents
Intelligent control method of generating equipment Download PDFInfo
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- CN101581922A CN101581922A CN 200810050710 CN200810050710A CN101581922A CN 101581922 A CN101581922 A CN 101581922A CN 200810050710 CN200810050710 CN 200810050710 CN 200810050710 A CN200810050710 A CN 200810050710A CN 101581922 A CN101581922 A CN 101581922A
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Abstract
The invention relates to an intelligent control method of generating equipment, which belongs to an improvement on generating equipment control in the electronic field. The invention aims at providing the intelligent control method of the generating equipment for logical conversion and control output of running state signals of generating equipment such as a coal mill, a fan, a motor pump and the like by replacing an original dual-position relay screen with an intelligent control system of the generating equipment. In the invention, the 110V direct-current voltage signal of the generating equipment is converted into 24V via a voltage conversion plate, the voltage signal is connected to an input module ID212 of a PLC, OD215 outputs direct-current signals to control a state indicator light of the device of an operating display panel, and device state reset and power throw-in operation is carried out on the operating panel till the control work of the unit are all finished. In the invention, a programmable logic controller (PLC) is used to replace an original 110V direct-current dual-position relay, a time relay and an intermediate relay; the operating display panel solves the production problems of fault equipment location display and device state rapid reset.
Description
Skill wood field:
The invention belongs to the improvement of in the electronic applications generating set being controlled.
Background technology:
Original generating set (tens equipment running status such as coal pulverizer, induced draft fan, electrically driven feed pump (move or stop) signal is sent into 110 volts of DC control circuits of power plant, these signals carry out operations such as logic determines, time-delay, self-locking through the logic control circuit of being made up of tens relays again, and operating result provides with relay independent contact form again.Exportable 110 volts of direct currents, 48 volts of direct currents, 220 volts of control signals that exchange.Original logic control device mainly adopts 110 volts of direct current two-position relays, the time relay, auxiliary reclay.
The control logic circuit of thermal power plant tradition subsidiary engine equipment running status is finished by hundreds of two-position relay, auxiliary reclay, the time relay, and these relays are finished the transmission of signal by mechanical contacts, exist the contact to be easy to oxidation; Mechanical fault easily takes place; Reliable in action is poor; The contact loose contact, problems such as the easy decay of signal.
Under original control mode; when certain device fails; the operations staff can't know that equipment breaks down; often need the spend plenty of time to search the trouble spot; owing to can't in time fix a breakdown; surplus equipment just needs the operation continuously of big load, is not having under the stand-by equipment situation, and genset exists load down until the great risk of shutting down.
Original controlling unit, needs to be resetted on the spot to device context by the special messenger owing to adopt single relay logic control after certain equipment failure is got rid of by the technician again, makes equipment recover normal operating condition.This disposal route is not only required great effort but also is time-consuming, greatly influences the equipment high efficiency operation.
Summary of the invention:
The present invention seeks to replace original two-position relay screen, finish the logical transition of generating set operating state signals such as coal pulverizer, blower fan and electrodynamic pump and the intelligent control method of generating equipment of control output with the generating set intelligence control system.
Step of the present invention is:
A, scene provide 110 volts of d. c. voltage signals of generating set, at first these signals are connected respectively to the input end of hardware system connecting terminal block, simultaneously device reset of being sent by operation display panel and hardware controls power supply drop into/withdraw from operation signal and deliver on the connecting terminal block with 24 volts direct current forms, pass through terminal row again and are connected to the PLC load module;
Dispose protective tube between the input terminal of b, each road signal of connecting terminal block and the lead-out terminal, the connection terminal outgoing side is directly connected on the connection terminal input end of voltage transformation plate, and the output terminal at the voltage transformation plate obtains the acceptable normal voltage signal of PLC load module behind voltage transformation then;
C, the voltage signal after conversion insert the load module ID212 of PLC, and the logic control software of PLC inside carries out logic determines to input signal, make the equipment state logic control become programmed logic control;
D, the logical operation of input signal process are by OD224 output relay independent contact, control output, equipment state pilot lamp by OD215 output direct current signal control operation display board, can carry out on the guidance panel that equipment state resets, the operation of power supply input, this unit controls work so far is all over.
The present invention adopts programmable controller (PLC) to replace original 110 volts of direct current two-position relay, the time relay and auxiliary reclays, and its advantage is:
1, adopted a kind of extremely cost-effective dc-dc conversion method that 110 volts of d. c. voltage signals are transformed between 22～25 volts, make input voltage reach the module allowed band, satisfactorily resolved the reception allowed band problem that magnitude of voltage in the signal input process exceeds PLC load module ID212;
2, the present invention adopts the intellectualized operation display board to solve faulty equipment locating and displaying and the equipment state production difficult problem that resets fast.At first adopt Based Intelligent Control can judge that device fails fast, show in real time by the three-color LED luminotron on 24 volts of direct current signal control operation display boards of OD215 module output then; Simultaneously can also be on the operation display board equipment of having fixed a breakdown being resetted fast makes equipment enter normal condition;
3, behind employing the present invention, every unit can be cancelled 65 of two-position relays, 16 of auxiliary reclays, 2 in the time relay;
4, because PLC load module ID212 adopts multiple signals common port mode, therefore this control system is at the input of every road signal, a pair of direct current protective tube of delivery outlet (being located on the connecting terminal block) design, its effect is when system's generation DC ground fault, can be with each equipment independent disconnection from control system, do not produce and interact; When the technician uses megohmmeter to shake the survey line road, can not exert an influence simultaneously to PLC module in this control system.
Description of drawings:
Fig. 1 is a control procedure process flow diagram of the present invention;
Fig. 2 is a voltage transformation schematic diagram of the present invention;
Fig. 3 is an element distribution plan of the present invention;
Fig. 4 is generating set intelligence control system panel layout figure of the present invention;
Fig. 5 is an operation display panel schematic diagram of the present invention;
D1 is respectively the three-color LED luminotron of display device running status to D20 among Fig. 5; R1 is respectively the current-limiting resistance of equipment running status pilot lamp to R20; D21 and S1 are respectively the rest lamp and the reset button of A side apparatus fault-signal; D23 and S3 are respectively B side apparatus fault homing light and reset button; D22 and S2 are respectively A side power fail homing light and reset button; D24 and S4 are respectively B side power fail; J1---J5 is connected on the connecting terminal block of hardware system.
Fig. 6 is a holding circuit schematic diagram of the present invention.
Embodiment:
Concrete steps of the present invention are:
A, scene provide 110～115 volts of d. c. voltage signals of generating set, at first these signals are connected respectively to the input end of hardware system connecting terminal block, simultaneously device reset of being sent by operation display panel and hardware controls power supply drop into/withdraw from operation signal and deliver on the connecting terminal block with 22～25 volts direct current forms, pass through terminal row again and are connected to the PLC load module;
Dispose protective tube between the input terminal of b, each road signal of connecting terminal block and the lead-out terminal, the connection terminal outgoing side is directly connected on the connection terminal input end of voltage transformation plate, obtains the normal voltage signal of PLC load module then behind voltage transformation at the output terminal of voltage transformation plate; The voltage transformation plate adopts 2 divider resistance R
1And R
2, consider that circuitous resistance melts smelt, zero load, loading condition and all can the resistance value that control loop and programmable controller exert an influence be chosen for: R
1=R
2=10k Ω, the input resistance r (see figure 2) that the signal after the step-down of process dividing potential drop enters programmable controller PLC.
Because on-the-spot DC control circuit virtual voltage scope changes between 110～115 volts, thus after voltage signal passes through the step-down of voltage transformation plate, change 22～25 volts into by 110～115 volts, through the output voltage signal scope after the step-down between 22～25 volts.
C, the voltage signal after conversion insert the load module ID212 of PLC, and the logic control software of PLC inside carries out logic determines to input signal, make the equipment state logic control become programmed logic control.This process makes original relay hardware connection logic replace with software logic.This replacement makes the equipment state logic control become programmed logic control, and the reliability and stability of signal Processing are significantly improved, and the device control mode conversion is more flexible, in most cases only need to revise software and get final product, and hardware prolongs serviceable life greatly.
D, the logical operation of input signal process are by OD224 output relay independent contact, control output, equipment state pilot lamp by OD215 output direct current signal control operation display board, can carry out on the guidance panel that equipment state resets, the operation of power supply input, this unit controls work so far is all over.
Programmable controller of the present invention adopts the C200HS type PLC of Japanese Omron (OMRON) company, and its input block adopts the ID212 module; CPU (central processing unit) (CPU) adopts CPU21-E; Output unit adopts OD224 and OD215 module; The PLC power supply adopts uninterrupted power supply (ups) Unity.
The ID212 module is the input block of PLC, its input request signal is 24 volts of DC voltage, up to the present the PLC direct current load module of all producers all can't bear 110 volts of d. c. voltage signals in the world, and actual measurement shows that ID212 module actual reception signal effective range is between 18～28 volts.
Consider the genset security of system, kept original A, the B side is separated control mode.
Transmit control signal from PLC to the operation display board, the operation display board also can send operation signal to PLC.
The PLC main frame adopts 220 volts of AC power among the present invention, for security of system considers that this power supply is provided by the station-service uninterrupted power supply (ups) Unity.
One, SYSTEM SUMMARY
This control system partly is made up of signaling conversion circuit, signal controlling equipment and signal converting etc.Dc voltage conversion plate, operation display board are development voluntarily.This system adopts Power Electronic Technique, micro-computer technology to realize the logic control and the conversion of fuel-burning power plant generating set control signal, compares with traditional double position relay screen that native system has reliability height, control accuracy height, antijamming capability is strong, signal is accurate, logical conversion is flexible, state intuitive display, characteristics such as easy to maintenance.This device also possesses the fault memory function, can remember each malfunction automatically, for quick diagnosis, fixing a breakdown provides effective means.
This control system is that unit controls with the genset, and every unit designs 4 cover control system respectively, and every cover system is equipped with two cover PLC, respectively A side and B side apparatus is controlled.Every cover control system is carried out equipment state by operation display panel and is shown and reset operation that display device moves, stops and three kinds of states of fault respectively.
Two, element title and configuration
The layout that each element is installed is: A side Programmable Logic Controller 1, direct supply 2, A side power switch 9, B side power switch 4, operation display board power switch 10, B side Programmable Logic Controller 6, A side voltage transformation plate 7 and B side voltage transformation plate 8 are installed in casing, connecting terminal block 5 is arranged in both sides.(see figure 3)
The layout of the panel of generating set intelligence control system is: have generating set indication 18, A side apparatus reset key 11, A side power supply to drop into hot key 12, A side power supply indication 13, running LED 14 (running LED 14 is divided into red light running status, green light shut down condition and amber light malfunction), B side apparatus reset key 15, B side power supply input button 16 and B side power supply indication 17 on the panel.(see figure 4)
Three, systemic-function
Replace original two-position relay screen with the generating set intelligence control system, finish the logical transition and the control output of generating set operating state signals such as coal pulverizer, blower fan and electrodynamic pump.
Four, technical indicator (PLC partly sees C200HS installation and programming handbook)
1、CPU：C200HS
2, I/O module: C200H-ID212, C200H-OC224, C200H-OD215
3, programming communication: RS232 serial ports and special-purpose programming port
4, programming device: 486 above computing machines
5, programming software: LSS
6, PLC power supply: 220V exchanges
7, film face-plate pilot lamp power: 24V direct current
8, air switch: 220V, 60A
9, display device: film display operating panel
10, cabinet panel: double-deck plastic-blasting
Five, specification
1, on-site signal is mainly startup and the stop signal on the former electric installation drawings such as SWJ, 1SWJ, 2SWJ.110VDC contact point signal in the 110V control loop is converted to the 24VDC signal through signal transducer, to satisfy the electric pressure of PLC load module ID212.
2, four membrane buttons are arranged on preceding film face-plate, wherein A, B side are each two, be that example describes with the A side below, the effect of " signal return " button is the equipment state indication that resets again certain and break down and be restored, and the status indicator lamp color after resetting is by the actual motion state decision at that time of this equipment.As: when a front panel equipment yellow indicator lamp is lighted, that is to say that certain equipment has been in malfunction, have only this equipment failure to obtain getting rid of the back and press this side " signal return " button amber light (indicating fault) is converted to redness (operation indication) or green (stopping indication) by the operations staff.Otherwise amber light will be sustained.
3, signal input module adopts the OMRON ID212 of company load module, and this module is 16 to 1 common points, and input voltage is the 24V direct current, the 24V direct current signal of input quantity for obtaining through signal transducer.
4, the main processing signals input of central processing unit able to programme (CPU) module, output and signal logic conversion.The semaphore of handling by CPU outputs to terminal through the OC224 module.Outputing to front panel through the OD215 module lights a lamp.
5, corresponding every the equipment of every cover control system all is provided with this light fixture of a three-colour light-emitting pipe (LED) pilot lamp three kinds of display modes:
(1) the red light indication equipment puts into operation;
(2) the green light indication equipment is out of service;
(3) amber light indication equipment malfunction;
Then indication equipment is in malfunction when amber light is bright, non-artificial power down mode.As press " signal return " bond energy and this lamp is extinguished then illustrate malfunction to be removed, if stopping going out, amber light do not illustrate that fault still exists.It is a kind of malfunction memory function with the PLC logic realization that amber light is lighted, and does not influence the local operation of field apparatus when amber light is bright.
6, on the operation display board, divide A, B both sides respectively to be provided with a power light (redness) and represent that if this lamp is lighted this side PLC power work is normal; Red light extinguishes expression PLC power supply and breaks down.
7, in front on the plate behind operation A side or B side " power supply indication " button, self check can appear carrying out from top to bottom in the pilot lamp of each device name front, and each equipment pilot lamp is green by red stain in self check, and expression pilot lamp itself is working properly.
8, this control flow requirement working power is that 220V exchanges, and takes from UPS.The control flow power-supply system forbid power down otherwise control flow with cisco unity malfunction.
9, three air switch branch left, center, right are housed on the control flow and control A side PLC (top position), preceding film face-plate, B side PLC (lower position) respectively.
10, the input and output of every equipment all have corresponding lamp to light on the PLC respective modules, and particular location sees the I/O table for details, do not work as this lamp and then need find out the loop reason.
11,1, of each load No. 2 line is provided with fuse terminal (black) on connecting terminal block, and two fuses (capacity 5A) are arranged in the terminal, wherein one standby.(Fig. 6)
Annotate: among Fig. 6+KM and-KM is a direct current 110V voltage circuit control bus, promptly+55V and-the 55V bus.1RD, 2RD, 3RD and 4RD are the protective tube on the connecting terminal block.
Six, points for attention
(1) when each load control loop has a power failure, need open 1RD and 2RD simultaneously; 3RD and 4RD dc insurance (two groups of insurances that are each load throw simultaneously, disconnected) otherwise will return via the PLC loop.
(2) forbid to shake survey owing to the PLC element with megger.Therefore, when the control loop with each load of megger remote measurement insulate, must be disconnected to the direct current galvanized wire of control flow (PLC) element in advance, otherwise will cause the PLC module component to puncture.
(3) limit by the loop, " signal return " button will lose operating power on the panel when every side P1 and Q1 full cut-off electricity.Be that P1 and Q1 have guaranteed an equipment input at least, " signal return " button just can use.
Embodiment:
The explanation of Tieling Power Plant generating set intelligence control system effect
4 300MW Turbo-generator Set of our factory subsidiary engine equipment adopts " two-position relay select panel " to carry out signal controlling and conversion always.Equipment comprises 6 big blower fans, 5 coal pulverizers and tens of electrically driven feed pumps, oil pump etc.Operation through nearly ten years exposes some serious problems gradually, and these problems directly have influence on the safe operation of unit, and are very harmful to keeping the safety in production, and therefore is badly in need of solving as early as possible.Through repeatedly technological demonstration, the brand new technical scheme that final decision adopts Northeast China Institute of Electric Power Engineering to propose, and by Northeast China Institute of Electric Power Engineering's project verification research, they develop generating set intelligence control system and logic control software through the time of nearly a year and a half.Our factory adopts this technical design that " the two-position relay select panel " of original genset replaced.In four years, successively four units have been carried out successful technological transformation.
One, existing problems
Core component in " two-position relay select panel " that our factory is using is a two-position relay, because this relay adopts mechanical electromagnetic structure, control signal needs to carry out signal output or maintenance by the action of mechanical electromagnetic mechanism, some mechanical problems so just often appear, and its control function and effect can't be satisfied with the actual needs of production, and particular problem is as follows:
1, the not enough or situations such as decline, movable part slide mechanism bite of two-position relay contactor material purity difference, spring leaf elastic strength have all influenced conversion of signals and control.
2, input signal has certain decay after too many levels conversion, transmission, and two-position relay sensitivity is relatively poor, can't correct operation.
3, the two-position relay control coil is the 110V direct current, and contact exists electric arc to damage problem.
4, because two-position relay does not have the Intelligent treatment function, so each control system can't be judged the trouble spot when breaking down fast.
5, two-position relay is a discrete component, and every screen has tens, is unfavorable for repair and maintenance.Simultaneously, the logic control relation of being made up of relay also is unfavorable for modifications and changes.
Above reason can cause: stove control equipment can not drop into automatically, and causes boiler-turbine coordinated control not thrown; If rub-out signal appears in A, B side simultaneously, then cause thermal technology RB guard signal to send, unit load will get rid of to below 60% of rated capacity; If two primary air fan feedback signals are sent out with mistiming, will cause boiler extinguishment.The above fault is in operation and happens occasionally, and for guaranteeing the safe operation of our factory subsidiary engine equipment and unit, it is imperative that original two-position relay screen is transformed.
Two, solution
Through a large amount of on-the-spot running example analyses, it is feasible adopting electronic computer technology, Power Electronic Technique to solve an above-mentioned difficult problem.Select programmable controller (hereinafter to be referred as PLC) for use, and to be aided with the necessary electronic circuit be comparatively ideal solution, its advantage will be embodied in following several respects:
1, PLC is the intelligent program opertaing device of technical grade, and all components and parts all through strict screening, have high reliability and antijamming capability.
2, its input reference signal broad, adaptive faculty is strong.Can better handle the low-quality signal that forms because of factors such as decay or interference.
3, adopt Power Electronic Technique,, adopt PLC can effectively solve the contact electric arc problem that original 110V relay exists through input signal is carried out suitable DC-DC (DC-DC) conversion.
4, PLC has higher computing and logical process ability, and its logical relation is realized by software programming.The powerful measure that realizes complex logic with simple operations is provided; Simultaneously, system logic conversion and modification are very simple and convenient.
5, the I/O of PLC (I/O) unit has very high integrated level, the management of tens independent relays on the original relay control flow (whenever flat) can be reduced to the management of two cover PLC, thereby makes more convenient, the science more of plant maintenance.
Three, performance
Our factory utilized for four years successively 2,4,3, No. 1 genset were carried out technological transformation.Every former design of genset has 4 two-position relay select panels.Not changing original control mode and reducing to greatest extent under the principle of work on the spot amount, overlap the genset intelligence control systems with 4 in former shelf position " alternative original " two-position relay select panel ".Make joint efforts through both sides, the technological transformation of four genset generating set intelligence control systems all installing smoothly in the overhaul phase separately, debugging and finish, puts into operation on time.
Four, effect
" 300MW turbodynamo generating set intelligence control system " by Northeast China Institute of Electric Power Engineering's development adopts Power Electronic Technique, micro-computer technology to realize the logic control and the conversion of fuel-burning power plant generating set system signal, present four units have all been installed this system, continuous operation through several years, the fault that often occurred before not taking place as yet to transform, ruuning situation is good.No matter be the raising that each the subsidiary engine automatic control system or the reliability of turbine-boiler coordinated control system all have big level.Thereby improved the safe reliability of unit integral body.And providing assurance for creating good economic benefit, practical operation situation shows: this transformation is successful, has very high practical value.
Compare with traditional double position relay control flow that this intelligence control system has reliability height, control accuracy height, antijamming capability is strong, signal is accurate, logical conversion is flexible, state intuitive display, characteristics such as easy to maintenance.This device also possesses the fault memory function, can remember each malfunction automatically, for quick diagnosis, fixing a breakdown provides effective means.
That this system demonstrates is stable, the equipment running status indication is clear, safeguard superiority extremely easily, simultaneously new breakthrough is being arranged all aspect control of quality and the control function.
Five, benefit explanation
1, unit direct economic benefit (is example with coal pulverizer and blower fan)
(1) coal pulverizer: year economic benefit=every coal pulverizer institute on-load (7.5 ten thousand KW) * electric profit of every degree (ten thousand yuan of unit/KW.H) * five coal pulverizer total failare time=7.5 ten thousand KW.H * 0.18 yuan/KW.H * 20H=108.
(2) pressure fan: whenever stop a typhoon machine, then unit load shedding 100MW.The our factory rate for incorporation into the power network is by 0.294 yuan/kilowatt hour; cost of electricity-generating is 0.176 a yuan/kilowatt hour, shuts down the net profits (rate for incorporation into the power network-cost of electricity-generating)=100 * 4 * 2 * (0.294-0.176)=410,000 yuan of generating electricity number * stop time in year (average 2 hours/year) year economic benefit=every pressure fan institute on-load (100MW) * year.
Every unit year direct benefit=coal pulverizer year economic benefit+pressure fan year economic benefit
Ten thousand yuan of=108+41=149
Full factory year direct benefit=separate unit unit year direct benefit * 4=,596 ten thousand
2, unit indirect benefit
Reduce the generation of artificial and fee of material, for quick diagnosis, fixing a breakdown provides effective means.No matter be the raising that each the subsidiary engine automatic control system or the reliability of turbine-boiler coordinated control system all have very big level.Thereby improved the safe reliability of unit integral body.
Claims (1)
1, a kind of intelligent control method of generating equipment is characterized in that:
A, scene provide 110～115 volts of d. c. voltage signals of generating set, at first these signals are connected respectively to the input end of hardware system connecting terminal block, simultaneously device reset of being sent by operation display panel and hardware controls power supply drop into/withdraw from operation signal and deliver on the connecting terminal block with 22～25 volts direct current forms, pass through terminal row again and are connected to the PLC load module;
Dispose protective tube between the input terminal of b, each road signal of connecting terminal block and the lead-out terminal, the connection terminal outgoing side is directly connected on the connection terminal input end of voltage transformation plate, obtains the normal voltage signal of PLC load module then behind voltage transformation at the output terminal of voltage transformation plate;
C, the voltage signal after conversion insert the load module ID212 of PLC, and the logic control software of PLC inside carries out logic determines to input signal, make the equipment state logic control become programmed logic control;
D, the logical operation of input signal process are by OD224 output relay independent contact, control output, equipment state pilot lamp by OD215 output direct current signal control operation display board, can carry out on the guidance panel that equipment state resets, the operation of power supply input, this unit controls work so far is all over.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810050710 CN101581922A (en) | 2008-05-16 | 2008-05-16 | Intelligent control method of generating equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810050710 CN101581922A (en) | 2008-05-16 | 2008-05-16 | Intelligent control method of generating equipment |
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| Publication Number | Publication Date |
|---|---|
| CN101581922A true CN101581922A (en) | 2009-11-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200810050710 Pending CN101581922A (en) | 2008-05-16 | 2008-05-16 | Intelligent control method of generating equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103873549A (en) * | 2012-12-07 | 2014-06-18 | 株式会社捷太格特 | Plc communication system |
| CN106647326A (en) * | 2016-10-30 | 2017-05-10 | 合肥微匠信息科技有限公司 | Labview-based software simulation platform realizing method |
-
2008
- 2008-05-16 CN CN 200810050710 patent/CN101581922A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103873549A (en) * | 2012-12-07 | 2014-06-18 | 株式会社捷太格特 | Plc communication system |
| CN103873549B (en) * | 2012-12-07 | 2019-03-08 | 株式会社捷太格特 | Plc communication system |
| CN106647326A (en) * | 2016-10-30 | 2017-05-10 | 合肥微匠信息科技有限公司 | Labview-based software simulation platform realizing method |
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Application publication date: 20091118 |