CN201897723U - Control system for steam turbine LAN (local area network) - Google Patents
Control system for steam turbine LAN (local area network) Download PDFInfo
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- CN201897723U CN201897723U CN2009202122671U CN200920212267U CN201897723U CN 201897723 U CN201897723 U CN 201897723U CN 2009202122671 U CN2009202122671 U CN 2009202122671U CN 200920212267 U CN200920212267 U CN 200920212267U CN 201897723 U CN201897723 U CN 201897723U
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- frequency modulation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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Abstract
The utility model discloses a control system for a steam turbine LAN (local area network), which comprises a DEH (digital electro-hydraulic) control system, wherein the DEH control system is provided with three redundant speed measurement and overspeed protection modules SDP (signal data processor), and the three redundant speed measurement and overspeed protection modules SDP are connected with a control site OPC (overspeed protection control) solenoid valve through a 2/3 voting relay; each speed measurement and overspeed protection module SDP is provided with an overspeed limit module; and a DPU (distributed processing unit) is provided with a secondary frequency modulation module. The control system can effectively solve the problems of the existing steam turbine control system when a machine unit operates in the special operation conditions such as an isolated network and an LAN.
Description
Technical field:
The utility model relates to a kind of computer control system, particularly a kind of turbine control system that is used for power plant.
Background technology:
Continuous development along with computer system, turbine control system has been replaced the mode of initial pure hydraulic control system substantially by electrohydraulic control system DEH, because the dirigibility and the advance of deh control system, frequently the mode of controlling for merit is also little by little changing, the diversity factor of pure hydraulic system is to adjust by the Machinery Ministry cover to realize, and existing deh control system can be realized the setting of diversity factor easily by function, to satisfy the demand of different operating modes.
As shown in Figure 1, deh control system is mainly used in the control steam turbine and starts and on-load, realize every adjusting test function, and occur at unit that autostable 3000rpm is incorporated into the power networks so that continue under the situation of removal of load, deh control system is by receiving signals such as rotating speed from the scene, power, through realizing control to steam turbine rotating speed and power by each valve of control steam turbine after the logic control.
The frequency modulation of hydraulic system is also to be that the ratio regulative mode is regulated by primary frequency modulation, regulates when rotating speed rises when removal of load appears in system that porthole is proportional to be turned down, and the rotating speed when finally stablizing is not generally at the rotating speed same period.Deh control system follows the principle of hydraulic system aspect primary frequency modulation, be that ratio is regulated equally, can not eliminate the surplus poor of rotating speed.Regulate because primary frequency modulation is pure ratio,, can cause that usually unit can not satisfy the desired frequency range of consumer under this operating mode, even may cause and exceed the cycle claimed range and the jumping machine so be difficult to satisfy the requirement of precision.
Unit owing to many reasons, may run into the phenomenon of lonely net or LAN (Local Area Network) operation in actual motion, have plenty of because the imperfection of electric loop, reasons such as generator outlet bus, or this power plant is in the end of electrical network, or in particular cases electric network fault or the like appears.When unit occurring under the operating mode of lonely net or LAN (Local Area Network) operation, be difficult to stabilized (steady-state) speed 3000rpm,, particularly when paralysing, electrical network will face " the black startup " because of the requirement that can't satisfy the consumer frequency causes by forced-stopping machine.
Present deh control system is when unit is in big network operation and when normal removal of load occurring, when being generator outlet oil switch parallel off, change rotating speed control behind the DEH automatic reception generator parallel off signal over to, the autostable rotating speed is 3000rpm, is incorporated into the power networks again after the question generator fault recovery.As shown in Figure 2, in the generator outlet electric loop, when generating machine oil BR switch does not disconnect and when exporting to the switch BR1 of electrical network bus or BR2 and disconnecting, unit is actual still in load carrying, it is moment in fault, unexpected variation takes place and exceeds the speed limit in the load of unit band, and the still set grid-connection operation that DEH receives.
The utility model content:
The utility model is at existing turbine control system existing problem when unit is in this special operating condition of lonely net or LAN (Local Area Network), and the technical issues that need to address are as follows:
1) avoids the action in advance of overspeed signal as far as possible;
2) guarantee the safety of steam turbine, exceeding the speed limit, DEH need export the continuation hypervelocity that the overspeed protection actuating signal suppresses steam turbine behind the certain value;
3) frequency range that needs to satisfy consumer stable operation in the process of steam turbine stabilization of speed requires 49.5～50.5Hz, need stablize user's frequency by the regulative mode of indifference.
In order to solve the problems of the technologies described above, the utility model adopts following technical scheme:
A kind of control system at the operation of steam turbine LAN (Local Area Network), it comprises a deh control system, testing the speed and overspeed protection module SDP of three redundancies is set in the described deh control system, described three are tested the speed and overspeed protection module SDP selects two relays to connect the on-the-spot OPC solenoid valve of control by three, and be connected with corresponding station control card, corresponding station control card is connected with DPU in the deh control system; Described every test the speed and overspeed protection module SDP in be provided with the hypervelocity limiting module that limits the steam turbine hypervelocity by the restriction of overspeed protection action definite value, generator and steam turbine load unbalance protection dual mode simultaneously; The electricity frequency is the frequency modulation frequency modulation module of 50Hz when being provided with the mode of regulating by the PI indifference among the described DPU and realizing that unit enters the LAN (Local Area Network) operation.
Described overspeed protection action definite value is 103% of a steam turbine rated speed.
Described hypervelocity limiting module is the limiting module at the amount of unbalance＞60% o'clock trigger protection of the power of generator and steam turbine load.
The utility model that obtains according to technique scheme is on the basis of original deh control system DEH special control card spare to be made amendment; increase the control and the protection module of frequency modulation frequency modulation; increase simultaneously the frequency modulation frequency modulation module on the original basis, make the following characteristics that the utlity model has:
1) the utility model easy realization simple in structure, the user need not to change equipment set as long as carrying out certain change on the basis of existing equipment can realize the utility model, economizes on resources greatly;
2) the utility model is realized overspeed protection by hardware, and the response time is very fast, and the hardware logic partial response time plays very important effect less than 10ms to the overspeed protection of turbodynamo;
When 3) the utility model carries out the secondary frequency adjustment, adopt PI indifference regulative mode, the quality of frequency that offers consumer is higher.
These characteristics makes the utility model can solve existing turbine control system existing problem when unit is in this special operating condition of lonely net or LAN (Local Area Network) effectively.
Description of drawings:
Further specify the utility model below in conjunction with the drawings and specific embodiments.
Fig. 1 is existing turbine control system connection layout.
Fig. 2 is a generator outlet electric loop synoptic diagram.
Fig. 3 is the hardware block diagram of deh control system.
Fig. 4 is the structural representation of SDP card.
Fig. 5 is a power unbalance protection principle schematic.
Fig. 6 is DEH steering logic figure in the utility model.
Fig. 7 carries out the synoptic diagram of overspeed protection and frequency modulation frequency modulation for the utility model.
Generator outlet electric loop synoptic diagram when Fig. 8 is the utility model practical application.
Fig. 9 is an on-the-spot DEH system little network operation test trend map.
Embodiment:
For technological means, creation characteristic that the utility model is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the utility model.
The utility model is at existing turbine control system existing a series of problems when unit is in lonely net or LAN (Local Area Network) and moves this special operating condition; on the basis of original deh control system; by adopting the solution that software configuration increases the frequency modulation frequency modulation function among hardware modifications and the DPU, realize satisfying simultaneously the requirement of overspeed protection and stabilized (steady-state) speed.Hardware is provided with the hypervelocity of avoiding unit by the definite value protection, and software satisfies the requirement of consumer to frequency by PI indifference regulative mode.Make unit can both stabilized (steady-state) speed under the situation that full load rejection, localised load or band station service occur satisfy the frequency of electricity consumption.
Based on above-mentioned principle, of the present utility model being implemented as follows:
In order to realize that control reaches overspeed protection to the steam turbine rotating speed, as shown in Figure 3, the deh control system that the utility model provides adopts testing the speed and overspeed protection module SDP of triplex level redundancy.As shown in the figure, three redundancies test the speed and overspeed protection module SDP be placed on respectively three the card cages in, three steam turbine tach signals of collection in worksite also enter respectively three test the speed and overspeed protection module SDP in.These three SDP select two relays output OPC signal to on-the-spot OPC solenoid valve by three, realize its control is reached the purpose that suppresses hypervelocity; DPU controls this three SDP by corresponding station control card BC-NET in the deh control system simultaneously.
SDP is intelligent rotating speed card, and as shown in Figure 4, design has CPU and a FPGA in its hardware fastener, and all need the protection logic that realizes fast and frequency modulation frequency modulation, and all burning is in FPGA, and CPU realizes SDP card and the data communication of standing between the control card BC-NET with FPGA.
Because steam turbine is atwirl plant equipment, the control of rotating speed needs the control module of fast cycle.In order on SDP, to realize this function, the utility model every test the speed and overspeed protection module SDP in be provided with the hypervelocity limiting module.This hypervelocity limiting module is controlled by dual mode simultaneously to the control of steam turbine rotating speed: the one, export the mode that overspeed protection action node limits by SDP after the rotating speed arrival overspeed protection action definite value; the 2nd, predict hypervelocity in advance by generator and the unbalanced mode of steam turbine load and export the OPC signal, remove to control on-the-spot OPC solenoid valve to reach restriction hypervelocity effect.
When adopting first kind of mode to control the steam turbine rotating speed in the hypervelocity limiting module, its overspeed protection action definite value is 103%, is 103% of steam turbine rated speed 3000rpm, is 3090rpm.
When adopting the second way to control, when the amount of unbalance of the power of represent generator and steam turbine load＞60%, output OPC signal controlling scene OPC solenoid valve.
As shown in Figure 5, in generator off-the-line moment, because electric load pop-off and steam turbine load lag behind and disappear, so the imbalance of moment can appear in generator load and steam turbine load, MW represents generator load, and the pressure steam pressure is represented steam turbine load among the IEP.When both difference greater than 60% the time, can predict that steam turbine can exceed the speed limit, so DEH sends the rotating speed that the OPC signal suppresses steam turbine before prior to the reality hypervelocity.
The utility model is in deh control system, and the mode of the primary frequency modulation of the pure ratio of ring and outer shroud proportional integral realizes the little network operation operating mode of steam turbine in adopting.DEH enters primary frequency modulation automatically behind the set grid-connection, and participates in calculating according to the diversity factor of setting.Wherein the primary frequency modulation parameter of deh control system is: diversity factor δ=5% (adjustable); Untuned dead band+2rpm (adjustable); Tuning range+150rpm (5%).
Because primary frequency modulation is to have difference to regulate, and, realize that 50Hz is the requirement of 3000rpm so for consumer, can not satisfy the electricity consumption frequency well because the load of unit when entering the LAN (Local Area Network) operation is uncertain often.For this problem, increased the frequency modulation frequency modulation functional module among the DPU of the utility model in deh control system, and in the DEH steering logic, increased the logical gate of frequency modulation frequency modulation, this frequency modulation frequency modulation logic realizes by increase the speed closed loop control function in original DEH is incorporated into the power networks steering logic, as shown in Figure 6.
The function that increases the frequency modulation frequency modulation module in the utility model deh control system is implemented as follows:
1, DEH judges that automatically unit enters little net state
Owing to reasons such as distances, power plant is difficult to offer the node of the state of DEH line side combined floodgate switch.When normal set grid-connection moved, the rotating speed of unit was generally more stable, just can occur the significant change of rotating speed when having only fault.So this module realizes DEH and judge according to the change in rotational speed situation whether unit enters little network operation state automatically, when rotating speed during greater than 3030rpm, deh control system thinks that unit is in little net or LAN (Local Area Network) operation.
2, fast cutback is regulated
When steam turbine rotating speed rising causing OPC action or PLU action, the power load of actual steam turbine load greater than reality is described, at this moment DEH starts the RUNBACK signal automatically and reduces the power given value of DEH to satisfy the demand of real power.RUNBACK reality also plays the effect of load set-point initial adjustment, has also avoided the action frequency of OPC simultaneously.When the fluctuation of speed upper limit reduced to the OPC working value, the output valve of DEH frequency modulation frequency modulation began to regulate by the pitch instruction.
3, rotating speed (frequency) is regulated
The DEH system judges that automatically the set-point that unit enters behind the frequency modulation frequency modulation simultaneously rotating speed is set at 3000rpm (50Hz), sets rotating speed and compares and enter the adjusting of PI indifference with actual speed, and finally satisfying actual speed is 3000rpm.Owing to also have integration to regulate in the regulating action that indifference is regulated except ratio is regulated, when instructing and feedback when deviation occurring, it is surplus poor to eliminate by autocatalytic reset action, thereby better unit is regulated like this.
The output of frequency modulation frequency modulation simultaneously, promptly the output order regulated of rotating speed PI indifference is added to, and output comes the regulating and controlling valve after original power given instruction.
4, DEH withdrawed from frequency modulation frequency modulation automatically after unit was incorporated into the power networks again
When rotating speed satisfy require the same period after, unit can be incorporated into the power networks again, stabilization of speed at this moment, DEH judges that automatically rotating speed has withdrawed from the dead zone range of frequency modulation frequency modulation, withdraws from the frequency modulation frequency modulation operation behind delay confirmation automatically, enters the state that is incorporated into the power networks normally.In this step when unit is actual be incorporated into the power networks after, tach signal is actual for net signal frequently, because unit reality is incorporated into the power networks again, so deh control system will withdraw from frequency modulation frequency modulation and transfer power control to.
Obtain operational process of the present utility model as shown in Figure 7 according to technique scheme, Zhong Jian vertical line has been depicted the scope of primary frequency modulation and frequency modulation frequency modulation in the figure, on behalf of power, ordinate, horizontal ordinate represent rotating speed, oblique line at first quartile is that diversity factor is 5 merit frequency curve, when can not satisfying mains frequency, primary frequency modulation changes when requiring, adjust the process of Here it is frequency modulation frequency modulation by the corresponding oblique line of translation.The set-point of frequency modulation frequency modulation can be by manual setting, but actual set is in service, and is relatively more difficult by artificial setting, thus when design, judge automatically by DEH, and produce set-point automatically.
If when the power of steam turbine differed greatly with little online load during big network operation in the process of operation, the little network operation of generation removal of load band may make generating unit speed rise rapidly.As shown in Figure 7; (overspeed protection before the set grid-connection generally all is 103% when power amount of unbalance＞60% or generating unit speed surpass 105%; but after the set grid-connection, for avoid the action of little net operating mode overspeed protection as far as possible, so overspeed protection is set at 105%); OPC protects control action; close pitch rapidly, steam turbine power is descended rapidly, so that power and load are as early as possible near balance; after rotating speed descends, again by above-mentioned once, the frequency modulation frequency modulation function finishes the frequency adjustment.In boosting velocity procedure, the working value of OPC is 103% still, remains unchanged.
In a single day control system detects little network operation, then excises the CCS remote control, drops into the frequency modulation frequency modulation loop, to reduce DEH power definite value.As shown in the figure, finally be stabilized in specified cycle.
The control system that the utility model provides when actual motion for the electric switch that is incorporated into the power networks: because the electric wiring complexity, the method of operation is various, be difficult to provide the state of the method for operation of the big net of unit band, little net, in this case, DEH adopts the way of judging current cycle, general when rotating speed+102% when above, think and be with little network operation, the input frequency modulation frequency modulation.
Signal for little network operation: adopt three road governing stage pressure as steam turbine power in the control of power-balance, the generator outlet power signal is as generator power.It is that steam turbine truly is incorporated into the power networks that the signal that is incorporated into the power networks of DEH system adopts generator outlet BR switch, so need relevant line switching state is all introduced DEH.
The utility model is when practical application, as long as carrying out certain modification in original control system can realize the utility model function corresponding, concrete modification is divided into hardware and software two parts:
Hardware modifications
1) the SDP card that will have a frequency modulation frequency modulation protection replaces original SDP card;
3) will represent the power of generator load and steam turbine load and middle pressure steam pressure signal to introduce in the SDP terminal strip;
3) the overspeed protection action definite value of increase frequency modulation frequency modulation is 103%.
Software modification
1) in configuration, increases the function that the steam turbine hypervelocity starts fast cutback;
2) increase frequency modulation frequency modulation PI indifference regulatory function and with original logic realization seamless combination;
The automatic paralleling function that need be incorporated into the power networks again when 4) increasing little network operation is promptly regulated the coupling realization simultaneous interconnecting function that satisfies generating unit speed and electrical network rotating speed by PID;
5) corresponding HMI picture modification promptly enters/glimmers on picture after withdrawing from frequency modulation frequency modulation as DEH.
The turbine control system that obtains by above-mentioned modification is when carrying out l-G simulation test, the DEH system is connected with emulator, in emulator, pack into the realistic model of steam turbine and generator, and the electric loop figure of simulation power plant, the operating mode of analog electrical air circuit fault monitors the action situation of frequency modulation frequency modulation and the situation of ascending to heaven of steam turbine actual speed.After the steam turbine operation was netted in the scope that is stabilized in requirement frequently, DEH withdrawed from frequency modulation frequency modulation automatically, is connected to the grid.
When the turbine control system that obtains by above-mentioned modification was actually used in the south vapour 50MW unit control of certain power plant, the generator outlet electric loop of this power plant as shown in Figure 8.
During the utility model practical application, electric fault occurs when set grid-connection moves, wiretap 1 disconnects and wiretap 2 is with little network operation operating mode when closed.Load on power that steam turbine is sent out and the 110KV is unequal generally speaking, so the little net cycle of 110KV must fluctuate.
Because by increasing the function of frequency modulation frequency modulation on the above-mentioned basis that is modified in original deh control system, deh control system at first increased/subtracted the steam turbine load according to the static characteristic of primary frequency modulation this moment, to stablize little net cycle, simultaneously deh control system judges whether to be in according to the state of wiretap 1 and is with little network operation, in case detect little network operation, then excise the CCS remote control, drop into the frequency modulation frequency modulation loop, to reduce DEH power definite value, finally be stabilized in specified cycle.
In the above-mentioned practical operation, when southern vapour 50MW unit gets rid of to 0.72MW from 6MW, DEH drops into frequency modulation frequency modulation automatically and regulates, the moment rotating speed of removal of load soars and be upgraded to 3141rpm most, minimum speed is 2999rpm, the cycle that vibrates half, and be 24S stabilization time, by removal of load curve shown in Figure 9 as can be known, it has reached extraordinary control effect.When the utility model moves, all can similarly be moved the unit test findings in the large unit unit, be had very wide application prospect.
More than show and described ultimate principle of the present utility model and principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not subjected to the restriction of above-mentioned case study on implementation; that describes in above-mentioned case study on implementation and the instructions just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (3)
1. control system at steam turbine LAN (Local Area Network) operation, comprise a deh control system, it is characterized in that, testing the speed and overspeed protection module SDP of three redundancies is set in the described deh control system, described three are tested the speed and overspeed protection module SDP selects two relays to connect the on-the-spot OPC solenoid valve of control by three, and be connected with corresponding station control card, corresponding station control card is connected with DPU in the deh control system; Described every test the speed and overspeed protection module SDP in be provided with the hypervelocity limiting module that limits the hypervelocity of steam turbine by the restriction of overspeed protection action definite value, generator and steam turbine load unbalance protection dual mode simultaneously; The electricity frequency is the frequency modulation frequency modulation module of 50Hz when being provided with the mode of regulating by the PI indifference among the described DPU and realizing that unit enters the LAN (Local Area Network) operation.
2. a kind of control system at the operation of steam turbine LAN (Local Area Network) according to claim 1 is characterized in that, described overspeed protection action definite value is 103% of a steam turbine rated speed.
3. a kind of control system at the operation of steam turbine LAN (Local Area Network) according to claim 1 is characterized in that described hypervelocity limiting module is the limiting module at the amount of unbalance＞60% o'clock trigger protection of the power of generator and steam turbine load.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009202122671U CN201897723U (en) | 2009-11-12 | 2009-11-12 | Control system for steam turbine LAN (local area network) |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009202122671U CN201897723U (en) | 2009-11-12 | 2009-11-12 | Control system for steam turbine LAN (local area network) |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102392694A (en) * | 2011-11-28 | 2012-03-28 | 北京北重汽轮电机有限责任公司 | Heating cogeneration generator unit |
| CN102392693A (en) * | 2011-11-28 | 2012-03-28 | 北京北重汽轮电机有限责任公司 | Heating cogeneration turbogenerator system |
| CN102402230B (en) * | 2011-11-29 | 2016-01-06 | 中广核工程有限公司 | Liquid level controlling system in nuclear power station carbonated drink reheating piece-rate system |
| CN112832876A (en) * | 2020-12-31 | 2021-05-25 | 威立雅（哈尔滨）热电有限公司 | Method for carrying out isolated network starting operation of steam turbine generator through automatic control system |
| WO2021098332A1 (en) * | 2019-11-18 | 2021-05-27 | 南京科远智慧科技集团股份有限公司 | Automatic inspection method applied to triply-redundant overspeed protection device |
-
2009
- 2009-11-12 CN CN2009202122671U patent/CN201897723U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102392694A (en) * | 2011-11-28 | 2012-03-28 | 北京北重汽轮电机有限责任公司 | Heating cogeneration generator unit |
| CN102392693A (en) * | 2011-11-28 | 2012-03-28 | 北京北重汽轮电机有限责任公司 | Heating cogeneration turbogenerator system |
| CN102402230B (en) * | 2011-11-29 | 2016-01-06 | 中广核工程有限公司 | Liquid level controlling system in nuclear power station carbonated drink reheating piece-rate system |
| WO2021098332A1 (en) * | 2019-11-18 | 2021-05-27 | 南京科远智慧科技集团股份有限公司 | Automatic inspection method applied to triply-redundant overspeed protection device |
| CN112832876A (en) * | 2020-12-31 | 2021-05-25 | 威立雅（哈尔滨）热电有限公司 | Method for carrying out isolated network starting operation of steam turbine generator through automatic control system |
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Granted publication date: 20110713 |