CN104295516A - Application of automatic switching mode of frequency converter of power station - Google Patents
Application of automatic switching mode of frequency converter of power station Download PDFInfo
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- CN104295516A CN104295516A CN201410387482.0A CN201410387482A CN104295516A CN 104295516 A CN104295516 A CN 104295516A CN 201410387482 A CN201410387482 A CN 201410387482A CN 104295516 A CN104295516 A CN 104295516A
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- draught fan
- frequency
- induced draught
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- frequency variator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/003—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by throttling
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- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The invention provides application of an automatic switching mode of a frequency converter of a power station. When power-frequency-to-variable-frequency switching of an induced draft fan is carried out during normal running of a unit, in order to be capable of meeting the running characteristics of the unit early, an inlet baffle of the induced draft fan can be manually adjusted by an operator, the furnace pressure is maintained stable, then power-frequency-to-variable-frequency switching of the induced draft fan is carried out, and then the baffle is manually adjusted by the operator to be at the preset opening degree after power-frequency-to-variable-frequency switching is successful. When variable-frequency-to-power-frequency switching of the induced draft fan is carried out, as the inlet baffle of the induced draft fan is basically located at the full-open position, an opening degree curve, corresponding to loads, of the opening degree of the inlet baffle of the induced draft fan needs to be increased to obtain the optimal adjustment mode, and after experiments, it is determined that the inlet baffle of the induced draft fan is limited to be at the opening degree of 60%.
Description
Technical field
The invention belongs to application converter technique and microelectronics technology, be specifically related to the frequency variator automatic switchover mode application of a kind of power station.
Background technique
It is centrifugal that Sanmenxia Gorge power plant #2 unit induced draught fan is that double suction enters, and is equipped with Beijing state electricity thinking SWdrive-MV06/2500 frequency variator, and in January, 2013, #2 unit AB induced draught fan frequency variator caused that unit is non-to stop in succession because fault is thought highly of in frequency conversion; Former induced draught fan power frequency and variable frequency starting are disconnecting link pattern, and power frequency shear frequently, frequency conversion cut all needs blowing-out machine, load down frequently, throwing oil just can complete, so its protection setting has induced draught fan all to stop MFT, induced draught fan frequency variator all stops MFT; In this context; on-the-spot induced draught fan runs is badly in need of a kind of solution; namely induced draught fan converting operation and power frequency operation can be met; and the operation of induced draught fan frequency conversion automatically switching power frequency can be realized; and distant place DCS manipulates variable frequency starting and power frequency startup induced draught fan runs; in addition, the no-harass switch of controling of the pressure of the oven can be realized in the mutual handoff procedure of induced draught fan frequency conversion power frequency, avoid causing because induced draught fan frequency conversion power frequency mutually switches the high or low triggering boiler main fuel trip of furnace pressure of furnace pressure and shut down.
Between #2 unit A level turn(a)round in September, 2013, Sanmenxia Gorge power plant #2 unit two induced draught fan frequency variators carry out upgrading, intend adopting Beijing state electricity thinking SWdrive-MV06/5000 frequency variator, this model frequency variator possesses remote variable frequency and starts and power frequency startup pattern, and can realize frequency conversion think highly of fault trigger frequency conversion be switched to power frequency operation pattern, and manually carry out frequency conversion power frequency and mutually switch, but along with the debugging sexual stage on probation finds this frequency variator poor reliability, home loop is complicated, heavy trouble signal frequently sends and causes frequency variator to be frequently switched to power frequency pattern by variable mode, this adjustment to combustion chamber draft produces very large hidden danger, for this reason, for this kind of phenomenon, invent the frequency variator automatic switchover mode application of a kind of power station, the combustion chamber draft formulated for frequency variator poor reliability regulates thinking, and demonstrate the rationality of this adjustment thinking, applicability and correctness further by the fault of theoretical, test and the actual generation of run duration.
Now for prior art, power station provided by the invention frequency variator automatic switchover mode is applied, and not only solves former induced draught fan frequency conversion and thinks highly of fault stoppage in transit frequency variator, and frequency variator starts, switches numerous and diverse phenomenon; And solve new transformation induced draught fan frequency variator poor reliability frequency conversion power frequency mutually switch cause furnace pressure fluctuation, do not jump the problem that id-motor and multiple operation screen integrate.
Summary of the invention
Object of the present invention is achieved through the following technical solutions:
Existing design enhances accuracy to induced draught fan entrance controllable register and smart, during in view of induced draught fan normal operation period " power frequency shear frequently ", " frequency conversion cut frequently " method of operation, easily produce disturbance to combustion chamber draft, institute thinks that can meet combustion chamber draft need adjust induced draught fan inlet baffle aperture; Existing our factory #2 unit induced draught fan regulates normal operation period, under id-motor power frequency operation mode, combustion chamber draft regulates by induced draught fan inlet baffle, under id-motor converting operation mode, induced draught fan inlet baffle is standard-sized sheet when unit load is greater than 90%, or by operations staff's manual tune induced draught fan entrance to standard-sized sheet, combustion chamber draft is by induced draught fan variable frequency adjustment.After transformation, time unit normal operation period induced draught fan " power frequency shear frequently ", for unit operation characteristic can be met ahead of time, can by operations staff's manual tune induced draught fan inlet baffle, and maintain furnace pressure stable after carry out induced draught fan " power frequency shear frequently ", after " power frequency shear frequently " success again by operations staff's manual tune baffle plate to presetting aperture; Time induced draught fan " frequency conversion cut frequently ", because induced draught fan inlet baffle is generally within standard-sized sheet position, so the induced draught fan inlet baffle aperture opening curve corresponding with load need be increased, to obtain optimum apjustment mode, spacing 60% through overtesting determination induced draught fan inlet baffle.
Now for prior art, a kind of power station frequency variator automatic switchover mode application tool provided by the invention has the following advantages:
1, the control thinking that in the application of power station frequency variator automatic switchover mode and handoff procedure, combustion chamber draft regulates still belongs to the first.
2, achieve distant place power frequency startup and variable frequency starting id-motor, and realize the mutual switching of its power frequency and frequency conversion in id-motor running.
3, power frequency operation is switched to after automatically can realizing the tripping operation of induced draught fan frequency variator.
4, to the no-harass switch achieved in combustion chamber draft adjustment between induced draught fan frequency variator frequency conversion power frequency.
Accompanying drawing explanation
Fig. 1-Fig. 8 is power station frequency variator automatic switchover mode application workflow schematic diagram
Embodiment
One, A (B) induced draught fan controls:
1, A (B) induced draught fan starts enabled condition (with logic):
Former logic:
1. A (B) id-motor bearing temperature < 70 DEG C;
2. A (B) top petrol tank oil level is normal;
3. A (B) induced draught fan exiting flue gas door is own closes;
4. A (B) induced draught fan inlet baffle closes;
Either side air channel unimpeded (two induced draught fans all stop and air preheater runs, and air preheater inlet flue gas baffle plate and air preheater outlet secondary air register are opened), or arbitrary gas fan allows and opposite side induced draught fan runs 5..
6. A (B) induced draught fan control loop fault does not exist.
7. induced draught fan frequency variator high pressure combined floodgate is had to allow (by specification requirement, when confirming that conversion system starts after necessary frequency variator charging complete, just allows to close 6KV high-voltage switch gear) under A (B) induced draught fan power frequency mode or induced draught fan conversion system
After change:
2.-and 7. retain constant, 1. change into: id-motor bearing temperature < 90 DEG C, induced draught fan bearing temperature < 70 DEG C and, above-mentioned condition can start id-motor after all meeting.
2, A (B) fan trip signal (or logic):
Former logic:
1. A (B) air preheater mair motor stops time delay 120S, and the large interlocking of boiler drops into, and A (B) induced draught fan runs;
2. A (B) induced draught fan all runs, and MFT, A (B) gas fan all stops;
3. A (B) induced draught fan lubrication pressure < 0.15Mpa time delay 3S;
4. A (B) induced draught fan fore bearing temperature element (TE (TE0705A/B) > 60 DEG C, rear bearing temperature element (TE (TE0706A/B) > 60 DEG C, motor fore bearing temperature element (TE (TE0713A/B) > 65 DEG C, electric motor back shaft hold temperature element (TE (TE0714A/B) > 65 DEG C and enter SCS, the arbitrary more upper limit of Logic judgment exports 1, with upper induced draught fan bearing temperature high switching value.
Arbitrary signal triggers time delay 3S connection again and jumps A (B) induced draught fan above
5. A (B) induced draught fan frequency variator conversion system, fault is thought highly of in the frequency conversion of A (B) induced draught fan
After change:
1. 2. 3. retain constant, 4. change into: before A (B) id-motor, each two temperature points of rear bearing are all greater than 95 DEG C (namely two selecting two), before A (B) induced draught fan, each two temperature points of rear bearing are all greater than 75 DEG C (namely two selecting two) and 5. change into: A (B) induced draught fan run and A (B) induced draught fan frequency variator without run signal, QF3 separating brake, induced draught fan electric current < 10A, four phases and rear time delay 5S (basis of time frequency variator power frequency shear frequency, determine frequently by the time for frequency conversion cut), increase this protection throwing for avoiding blower fan tripping operation between the starting period and back out pass.(namely induced draught fan manually exits this protection before starting, and manually drops into this protection after induced draught fan starts)
Note: newly-increased measuring point A (B) induced draught fan bearing drive end and free end vibration measuring point only do warning use in addition, and alarming value is set to > 6.3mm/s; A (B) id-motor coil temperature only does warning use, and alarming value is set to > 150 DEG C.
3, A (B) induced draught fan power frequency mode starts control:
A) A (B) induced draught fan power frequency startup enabled condition:
1. A (B) id-motor high-voltage switch gear is in disconnection position (increasing newly)
B) A (B) induced draught fan power frequency startup:
1. air and flue system picture A (B) induced draught fan frequency variator is clicked, click " power frequency pattern " operating button, ejection A (B) induced draught fan power frequency pattern operating end, clicks and closes a floodgate and confirm, DCS sends out 5S pulse and closes QF3 switch, and QF3 is in "on" position and is reddened by green.(accompanying drawing 1, accompanying drawing 2)
2. induced draught fan inlet baffle closes juxtaposition " manually " position, and juxtaposition " automatically " position closed by outlet damper.
3. A (B) induced draught fan operating end is ejected, after checking that " opening permission " lamp is bright, press A (B) induced draught fan start button, on A (B) induced draught fan operator, " opening " reddens look, DCS picture A (B) induced draught fan becomes redness from green,, induced draught fan outlet damper opened by connection.
4., after starting, slowly increase induced draught fan inlet baffle aperture, maintain normal furnace pressure, observe fan operation steady, vibration and temperature meet the requirements.
Note: be closing by hand QS1 during former A (B) induced draught fan power frequency startup, after transformation, frequency variator disconnecting link pattern (QS) changes switching mode (QF) into, increase a distant place " combined floodgate ", " separating brake " instruction, DCS increases operating end, can realize operation to QF3 in a distant place, in A (B) induced draught fan power frequency operating end, " combined floodgate ", " separating brake " instruction enabled condition are: A (B) id-motor high-voltage switch gear is in " separating brake " position.
4, the shear of A (B) induced draught fan power frequency is frequently:
1. DCS sends out " power frequency shear frequently " enabled instruction to frequency variator, and frequency-charger cabinet is removed in concurrent 5S pulse, and precharge command sent out by frequency variator, carry out precharge 35S, QF1 switch closes a floodgate, then self-inspection 10S, QF3 switch separating brake, QF2 switch closes a floodgate, and frequency variator runs and follows the trail of the current rotating speed of motor instantaneously; And carry out " power frequency shear frequently " period, before switching, namely frequency variator is without operation, and frequency converter controller manual mode and cut tracking, pursuit gain is 400rpm, after " power frequency shear is frequently " instruction sends, manually can put value to induced draught fan frequency converter controller in 120S.(accompanying drawing 3, accompanying drawing 4, accompanying drawing 5)
Two, A (B) induced draught fan VFC:
1, A (B) induced draught fan frequency variator starts enabled condition:
Former logic:
1. the frequency conversion of A (B) induced draught fan is thought highly of trouble signal and is not existed,
2. A (B) induced draught fan frequency variator QF1 "on" position, A (B) induced draught fan frequency variator QF2 "on" position, A (B) induced draught fan frequency variator QF3 "on" position is got non-,
3. A (B) induced draught fan frequency variator is ready,
4. A (B) induced draught fan runs,
After change:
1. 3. 4. retain, 2. change into: A (B) induced draught fan frequency variator QF1 "on" position, A (B) induced draught fan frequency variator QF2 "on" position, A (B) induced draught fan frequency variator QF3 gate-dividing state, can allow when above condition all exists to start induced draught fan frequency variator
2, A (B) induced draught fan frequency variator stops enabled condition:
Former logic: A (B) induced draught fan frequency variator rotating speed is less than 350rpm
After change: A (B) induced draught fan frequency variator rotating speed is less than 550rpm
3, A (B) induced draught fan frequency variator trip protection condition (override stops)
Induced draught fan frequency variator (retaining constant) jumped by A (B) fan trip connection
Note: A (B) the induced draught fan frequency variator override condition of stopping is A (B) fan trip, operating end is reported during Trip signal: without " power frequency shear frequently " instruction and DCS does not send out A (B) induced draught fan frequency variator start and stop instruction, and during the change of frequency variator running state, Trip signal can be reported, click ACK and can to reset alarm signal.
4, A (B) induced draught fan frequency variator conversion system starts:
1. air and flue system picture A (B) induced draught fan frequency variator is clicked; before conversion system starts; first " high-voltage switch gear protection is moved back in frequency conversion " should be exited; then " variable mode " operating button is clicked; eject A (B) induced draught fan variable mode operating end; click and close a floodgate and confirm, see that accompanying drawing 6, accompanying drawing 7, QF1, QF2 close a floodgate and reddened by green.
2. air and flue system picture A (B) induced draught fan frequency variator is clicked, by variable frequency adjustment, to desired value, (DCS limits minimum output speed 400rpm, the highest output speed 950rpm), induced draught fan inlet baffle, outlet damper are closed, outlet damper is put " automatically " position.
3. A (B) induced draught fan operator is ejected.After checking that " opening permission " lamp is bright, press A (B) induced draught fan start button, on A (B) induced draught fan operator, " opening " reddens look, and DCS picture A (B) induced draught fan becomes redness from green.
4. click " frequency variator " button, eject frequency variator operator, press start button, state instruction is with induced draught fan operator.
5., after starting, slowly open induced draught fan inlet baffle, increase frequency variator rotating speed, observe fan operation steady, vibration and temperature meet the requirements.
6. regulate frequency variator rotating speed, maintain normal furnace pressure, and drop into " high-voltage switch gear protection is moved back in frequency conversion ".
5, A (B) induced draught fan frequency variator frequency conversion cut is frequently:
Newly-increased logic:
1. DCS sends out " frequency conversion cut frequently " instruction to frequency variator, see accompanying drawing 8, click and to start and after confirming, DCS sends out 5S pulse, frequency variator rises to 990rpm (logic and frequency variator arrange high limit and export 950rpm), then QF1, QF2 switch separating brake from being about to rotating speed, and after time delay in 2 seconds, QF3 switch closes a floodgate, this time period such as furnace pressure changes, and operations staff answers manual tune induced draught fan inlet baffle to correct position to maintain furnace pressure.，
2. there occurs frequency conversion when converting operation and think highly of fault, instruction (frequency variator inside realizes) that frequency variator can be sent out " frequency conversion cut frequently "; Concurrent heavy fault goes DCS to join pass induced draught fan inlet baffle, and to predefined value, (induced draught fan inlet baffle aperture is given by running special work according to unit load: when two induced draught fans run, during below unit load 150MW, induced draught fan inlet baffle is defined as 10%; During more than unit load 150MW, load often increases 10MW, and induced draught fan inlet baffle aperture increases by 1.5%, when load 320MW is the highest, and inlet baffle aperture about 35.5%; During separate unit fan operation, no matter unit load is how many, and induced draught fan inlet baffle is all limited in 35%, and induced draught fan inlet baffle exports and is highly limited to 60% now.)
3. because of induced draught fan frequency conversion think highly of fault after frequency conversion switch easily cause furnace pressure negative sense to fluctuate, need increase when fault is thought highly of in frequency conversion and throw functional oil to maintain furnace pressure, when design proposal is with unit RB, namely AB mill has one to grind operation and frequency variator operation, the heavy fault of frequency variator report then casts layer oil, then drops into middle level oil as lower floor's oil after 20S does not drop into; AB mill does not run, and CDE arbitrary mill runs then made a basket layer oil, and after 20S, middle level oil does not drop into and then drops into lower floor's oil,
6, induced draught fan inlet baffle regulates:
Former logic:
1. when conversion system runs, frequency variator run signal disappears, and sends out 20S pulse and closes inlet baffle to 0%.
2. when frequency variator starts, (when frequency variator operates to 1) is sent out 20S pulse and is closed inlet baffle.
3. two induced draught fans all stop rear induced draught fan inlet baffle and open by force to 100%5 minutes, can operate after 5 minutes.
After change:
1. when conversion system runs, time delay disconnects 5S, the heavy fault time delay of frequency variator report disconnects 5S, both with then send out 3S pulse, inlet baffle opening degree instruction is set to default aperture (load X, baffle opening Y:150,10 when two induced draught fans all run; 160,11.5; 170,13; 180,14.5; 190,16; 200,17.5; 210,19; 220,20.5; 230,22; 240,23.5; 250,25; 260,26.5; 270,28; 280,29.5; 290,31; 300,32.5; 310,34; 320,35.5; ); When separate unit induced draught fan runs, no matter inlet baffle opening degree instruction is all set to 35% by load.
2. when frequency variator starts (when frequency variator operates to 1) send out 20S pulse, the shear of frequency variator power frequency frequently (DCS instruction) get non-, the two with, or induced draught fan out of service 10S pulse, then sends out 20S pulse and closes inlet baffle.
3. retain constant
7, frequency variator regulates:
Former logic:
1. manual condition (or logic) cut by A induced draught fan frequency variator:
MFT (5S pulse); A induced draught fan frequency variator tripping operation (10S pulse); A fan trip; A induced draught fan induced draught fan run signal disappears (10S pulse); Homonymy induced draught fan outlet damper is closed; During without RB, instruction and feedback deviation are greater than 100rpm.
2. tracking cut by frequency variator: (or logic) MFT (5S pulse); Fan trip.
3. frequency variator override closes: when the tripping operation of (or logic) frequency variator or homonymy induced draught fan run signal disappear, frequency variator is cut manually, and override closes to 300rpm.
4. (in fact MFT uniting and adjustment frequency variator) after MFT, frequency variator instruction is by air-supply instruction functions correction (0 ,-5; 10 ,-5; 50 ,-12; 100 ,-20) function needs to revise, and occurrence is obtained by aerodynamic field test.
5. AB induced draught fan frequency converter controller output order exports through balancing module balances after being exported by controling of the pressure of the oven device.
After change:
1. change into: during without RB, instruction and feedback deviation are greater than 150rpm.Increase: the negate of A induced draught fan frequency variator run signal; The frequency conversion of A induced draught fan is thought highly of fault and is sent out 10S pulse and upper A induced draught fan QF3 closes a floodgate, A induced draught fan runs; AB induced draught fan inlet baffle auto state; The frequency conversion of B induced draught fan is thought highly of fault and is sent out 10S pulse and upper B induced draught fan QF3 closes a floodgate, B induced draught fan runs and time delay 1S.
2. change into: increase: the negate of A induced draught fan frequency variator run signal, the frequency conversion of A induced draught fan is thought highly of fault and is sent out 10S pulse and upper A induced draught fan QF3 closes a floodgate, A induced draught fan runs.
3. change into: frequency variator override closes: when the tripping operation of (or logic) frequency variator or homonymy induced draught fan run signal disappear, frequency variator is cut manually, and override closes to 400rpm.
4. change into: function correction data are temporarily constant, determine and change after to be tested.
5. change into: as, AB side induced draught fan conversion system runs, fault is thought highly of in the frequency conversion of A side, frequency conversion cut is carried out frequently voluntarily in frequency variator inside, A side, B side is kept to regulate in handoff procedure motionless, namely think highly of trouble signal by the frequency conversion of A side to send out 3S pulse (i.e. frequency conversion cut frequently time) and carry out locking B side frequency variator and export increase and decrease instruction, in 3S, tracking cut by PID regulator, after A side becomes cut handover success, B side frequency variator is cut manually, output order during B side frequency variator output order tracking A side fault simultaneously, A side entrance baffle plate is closed according to load homologous thread; Switch unsuccessful, B side frequency variator is followed the tracks of furnace pressure and is regulated, and A side fan trip triggers RB
8, after A (B) Frequency Conversion on Induced Fan, frequency conversion protection is optimized:
1. " induced draught fan frequency variator all stops " MFT, during two induced draught fan frequency variator converting operations, frequency variator run signal disappears and triggers MFT, cancels.When frequency variator is switched to power frequency by frequency conversion, unsuccessfully will jump induced draught fan (frequency variator inside realize) if switch.
2. A (B) induced draught fan frequency variator run signal disappears and triggers RB, and during induced draught fan frequency variator converting operation, frequency variator run signal disappears and triggers RB, cancels.When frequency variator is switched to power frequency by frequency conversion, unsuccessfully will jump induced draught fan (frequency variator inside realize) if switch.
3. fault connection jumping induced draught fan is thought highly of in the frequency conversion of A (B) induced draught fan.
Change into: A (B) induced draught fan run and A (B) induced draught fan frequency variator without run signal, QF3 separating brake; induced draught fan electric current < 10A; four phases and rear time delay 5S (basis of time frequency variator power frequency shear frequency; determine frequently by the time for frequency conversion cut), increase this protection throwing for avoiding blower fan tripping operation between the starting period and back out pass.(namely induced draught fan manually exits this protection before starting, and manually drops into this protection after induced draught fan starts)
4. during A (B) induced draught fan converting operation, homonymy gas fan jumped by frequency variator tripping operation connection, cancels.
When 9, setting up the operation of induced draught fan frequency variator, id-motor electric current is reported to the police lower than 10A.
Before the transformation of induced draught fan frequency variator, #2 unit induced draught fan power frequency startup, variable frequency starting all need on-the-spot conjunction disconnecting link, power frequency frequency conversion switches needs blowing-out machine load down to throw wet goods measure, and frequently causes fan trip because fault is thought highly of in frequency conversion, causes unit load to fluctuate even unit tripping; The startup of distant place power frequency and frequency conversion is achieved after transformation, and the mutual switching of power frequency frequency conversion can be carried out in a distant place, can realize after fault is thought highly of in frequency conversion being automatically switched to power frequency operation by frequency conversion, and do not affect unit load, after in September, 2013 #2 stove induced draught fan frequency variator transformation, frequency conversion is so far thought highly of fault and is caused frequency variator to trip to have 4 times, and all success is automatic is switched to power frequency mode by conversion system and runs; Unit operation is stablized.
Claims (1)
1. a power station frequency variator automatic switchover mode application, it is characterized by: time unit normal operation period induced draught fan " power frequency shear frequently ", by operations staff's manual tune induced draught fan inlet baffle, and maintain furnace pressure stable after carry out induced draught fan " power frequency shear frequently ", after " power frequency shear frequently " success again by operations staff's manual tune baffle plate to presetting aperture; Time induced draught fan " frequency conversion cut is frequently ", increase the opening curve that induced draught fan inlet baffle aperture is corresponding with load, spacing 60% through overtesting determination induced draught fan inlet baffle.
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| CN201410387482.0A CN104295516A (en) | 2014-08-08 | 2014-08-08 | Application of automatic switching mode of frequency converter of power station |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106499654A (en) * | 2016-10-28 | 2017-03-15 | 山东电力建设第工程公司 | The testing program of the automatic cut frequency of Large-scale machine set primary air fan frequency conversion |
| WO2017071548A1 (en) * | 2015-10-28 | 2017-05-04 | 广东电网有限责任公司电力科学研究院 | Balance control method and system for abrupt change in device output |
| CN113339840A (en) * | 2021-06-17 | 2021-09-03 | 杭州意能电力技术有限公司 | Self-starting control method of thermal power generating unit wind smoke system based on autonomous object |
| CN113448295A (en) * | 2021-05-14 | 2021-09-28 | 郑州旭飞光电科技有限公司 | Method for switching induced draft fan, processor and storage medium |
| CN113530871A (en) * | 2021-08-10 | 2021-10-22 | 西安热工研究院有限公司 | Power frequency dynamic switching method for frequency converter fault state of axial flow fan of power station |
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| CN106499654A (en) * | 2016-10-28 | 2017-03-15 | 山东电力建设第工程公司 | The testing program of the automatic cut frequency of Large-scale machine set primary air fan frequency conversion |
| WO2018076128A1 (en) * | 2016-10-28 | 2018-05-03 | 中国电建集团山东电力建设第一工程有限公司 | Test scheme for automatically switching from variable frequency to power frequency for primary draught fan in large unit |
| CN106499654B (en) * | 2016-10-28 | 2018-05-18 | 山东电力建设第一工程公司 | The testing program of the automatic cutting frequency of Large-scale machine set primary air fan frequency conversion |
| CN113448295A (en) * | 2021-05-14 | 2021-09-28 | 郑州旭飞光电科技有限公司 | Method for switching induced draft fan, processor and storage medium |
| CN113339840A (en) * | 2021-06-17 | 2021-09-03 | 杭州意能电力技术有限公司 | Self-starting control method of thermal power generating unit wind smoke system based on autonomous object |
| CN113339840B (en) * | 2021-06-17 | 2023-03-10 | 杭州意能电力技术有限公司 | Self-starting control method of thermal power generating unit wind smoke system based on autonomous object |
| CN113530871A (en) * | 2021-08-10 | 2021-10-22 | 西安热工研究院有限公司 | Power frequency dynamic switching method for frequency converter fault state of axial flow fan of power station |
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