CN108266398A - Stable operation method during primary air fan frequency conversion cut frequency - Google Patents
Stable operation method during primary air fan frequency conversion cut frequency Download PDFInfo
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- CN108266398A CN108266398A CN201710001259.1A CN201710001259A CN108266398A CN 108266398 A CN108266398 A CN 108266398A CN 201710001259 A CN201710001259 A CN 201710001259A CN 108266398 A CN108266398 A CN 108266398A
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- frequency
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- separating brake
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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
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Abstract
The present invention provides a kind of stable operation method during primary air fan frequency conversion cut frequency, ac bus is connect successively by switchgear house power frequency switch (QF), frequency converter input side switch (QF1) with the input terminal of frequency converter, the output terminal of frequency converter switchs (QF2) through output side transducer and is connect with the motor of primary air fan, motor of the both ends of bypass power frequency switch (QF3) respectively with the interface of switchgear house power frequency switch (QF) and frequency converter input side switch (QF1), primary air fan is connect, and the operation method includes：When frequency converter normal operation and according to primary air fan operating condition judgement answer cut frequency when, or during frequency converter failure, make output side transducer switch (QF2) separating brake, bypass power frequency switch (QF3) combined floodgate and frequency converter input side switch (QF1) separating brake successively, so as to which primary air fan is switched to power frequency operation state.The present invention can break down in frequency converter or normally be switched to power frequency bypass when, avoid causing when there is overcurrent the situation of tripping.
Description
Technical field
The present invention relates to technical field of electricity, and in particular to stable operation side during a kind of primary air fan frequency conversion cut frequency
Method.
Background technology
Motor frequency change power-saving technology is the important energy conservation measure that National Energy Board dominates popularization.With power grid production capacity
Serious superfluous, peak load regulation becomes inevitable, however long-term underrun phenomenon is difficult to improve in a short time, leads to subsidiary engine low-load
Operating condition deviates economic zone, and station service power consumption rate remains high.
With the rapid development of Power Electronic Technique, computer and automatic control technology, AC speed regulating replaces DC speed regulation,
And computer numerical control (CNC) technology substitution analog control technique has become development trend so that motor ac variable frequency speed regulation skill
Art becomes a kind of main means of current economize on electricity and Promote Technology.
High voltage AC frequency conversion speed adjusting technique is the novel electrical biography of one kind developed rapidly since the 1990s
Dynamic speed adjusting technique, is mainly used for the frequency control of ac motor, and technology and performance surpass other any modes of speed regulation
(such as:Pole-changing control, slip regulating speed, internal feedback series speed governing and fluid coupling speed governing etc.).Frequency control is with its significant section
Can benefit, higher adjusting speed accuracy, wider speed adjustable range, perfect power electronics defencive function and be easily achieved from
Dynamic communication function, has obtained the accreditation of users and the confirmation in market, in safe and reliable to operation, easy to install and use, repair
Maintenance workload is small etc., also brings great convenience to user and economic benefit, has become domestic and international enterprise's electricity
The preferred option of motivation energy saving of system.
The effect of power plant primary air fan is conveying and dry coal dust, and supplies the air needed for fuel combustion initial stage, is belonged to
In very important load, so the electrical major loop of primary air fan frequency converter is often set as frequency converter band Auto power frequency bypass side
Formula.When frequency converter breaks down or normally switches, bypass power frequency circuit should be rapidly switched to, to ensure that primary air fan can be tieed up
Hold operation.
But in the prior art frequency converter break down or be normally switched to power frequency bypass when, due in primary air fan
There is residual voltages in high-tension motor, overcurrent occur when power frequency can be caused to close a floodgate and cause happening for tripping.
Invention content
The technical problems to be solved by the invention are for the drawbacks described above in the presence of the prior art, are provided a kind of primary
Stable operation method during fan frequency conversion cut frequency when can break down in frequency converter or normally be switched to power frequency bypass, is kept away
Exempt to cause when there is overcurrent the situation of tripping.
Technical solution is used by solving present invention problem：
The present invention provides a kind of stable operation method during primary air fan frequency conversion cut frequency, wherein, ac bus passes through successively
Cross switchgear house power frequency switch (QF), frequency converter input side switch (QF1) is connect with the input terminal of frequency converter, the output terminal of frequency converter
Through output side transducer (QF2) is switched to connect with the motor of primary air fan, bypass power frequency switch (QF3) both ends respectively with
Electric room power frequency switch (QF) connects with the interface of frequency converter input side switch (QF1), the motor of primary air fan, the operation
Method includes the following steps：
When frequency converter normal operation and according to primary air fan operating condition judgement answer cut frequency when or frequency converter occur therefore
During barrier, make output side transducer switch (QF2) separating brake, bypass power frequency switch (QF3) combined floodgate and frequency converter input side switch successively
(QF1) separating brake, so as to which primary air fan is switched to power frequency operation state.
Optionally, when frequency converter normal operation and according to primary air fan operating condition judgement answer cut frequency when, make frequency converter
The step of output side switch (QF2) separating brake is specially：
Separating brake instruction is sent from DCS backstages to output side transducer switch (QF2)；
If in the first preset time from sending the separating brake instruction moment to output side transducer switch (QF2) on DCS backstages,
Frequency converter control unit detects " the QF2 gate-dividing states feedback " that output side transducer switch (QF2) is sent, then judges frequency converter
The success of output side switch (QF2) separating brake；Otherwise judgement output side transducer switch (QF2) separating brake fails and is overhauled, then
Above-mentioned steps are repeated until judgement output side transducer switch (QF2) separating brake success.
Optionally, when frequency converter normal operation and according to primary air fan operating condition judgement answer cut frequency when, make bypass work
Frequently the step of switch (QF3) combined floodgate is specially：
The moment same period is calculated by frequency converter voltage monitoring unit；
Frequency converter control unit is made to send reclosing command to bypass power frequency switch (QF3) at the moment same period；
If in the second preset time from the moment same period, frequency converter control unit and DCS backstages all detect side
" the QF3 "on" positions feedback " that road power frequency switch (QF3) is sent then judges to bypass power frequency switch (QF3) closing success；Otherwise sentence
Surely bypass power frequency switch (QF3), which closes a floodgate, fails and is overhauled, and then repeats above-mentioned steps until judgement bypass power frequency is opened
Close (QF3) closing success.
Optionally, when frequency converter normal operation and according to primary air fan operating condition judgement answer cut frequency when, make frequency converter
Input side switch (QF1) separating brake the step of be specially：
(QF1) is switched in DCS backstages manual operation separating brake frequency converter input side by staff, if staff should divide
Lock frequency converter input side, which switchs, is not carried out aforementioned separating brake action in (QF1) third preset time from the moment, then from DCS backstages to
Frequency converter input side switch (QF1) sends separating brake instruction；
If in the 4th preset time from sending the separating brake instruction moment to frequency converter input side switch (QF1) on DCS backstages,
Frequency converter control unit and DCS backstages all detect " QF1 gate-dividing states feedback " that frequency converter input side switch (QF1) is sent,
Then judge switch (QF1) separating brake success of frequency converter input side；Otherwise judgement frequency converter input side switch (QF1) separating brake is unsuccessfully gone forward side by side
Then row maintenance repeats above-mentioned steps until input side switch (QF1) separating brake success of judgement frequency converter.
Optionally, when frequency converter breaks down, make output side transducer switch (QF2) separating brake the step of be specially：
From frequency converter control unit and DCS backstages separating brake instruction is sent to output side transducer switch (QF2)；
If in the 5th preset time from (QF2) is switched to output side transducer and sends the separating brake instruction moment, frequency converter
Control unit and DCS backstages all detect " QF2 gate-dividing states feedback " that output side transducer switch (QF2) is sent, then judge
Output side transducer switch (QF2) separating brake success；Otherwise judgement output side transducer switch (QF2) separating brake failure.
Optionally, after judgement output side transducer switch (QF2) separating brake failure, following steps are further included：
From frequency converter control unit and DCS backstages separating brake instruction is sent to frequency converter input side switch (QF1)；
If in the 9th preset time from sending the separating brake instruction moment to frequency converter input side switch (QF1), frequency converter
Control unit and DCS backstages all detect " QF1 gate-dividing states feedback " that frequency converter input side switch (QF1) is sent, then judge
Switch (QF1) separating brake success of frequency converter input side；Otherwise judgement frequency converter input side switch (QF1) separating brake fails and is examined
It repaiies, then repeats above-mentioned steps until input side switch (QF1) separating brake success of judgement frequency converter.
Optionally, when frequency converter breaks down, make bypass power frequency switch (QF3) close a floodgate the step of be specially：
The moment same period is calculated by frequency converter voltage monitoring unit；
Frequency converter control unit is made to send reclosing command to bypass power frequency switch (QF3) at the moment same period；
If in the 6th preset time from the moment same period, frequency converter control unit and DCS backstages all detect side
" the QF3 "on" positions feedback " that road power frequency switch (QF3) is sent then judges to bypass power frequency switch (QF3) closing success；Otherwise sentence
Surely bypass power frequency switch (QF3), which closes a floodgate, fails and is overhauled, and then repeats above-mentioned steps until judgement bypass power frequency is opened
Close (QF3) closing success.
Optionally, when frequency converter breaks down, make frequency converter input side switch (QF1) separating brake the step of be specially：
(QF1) is switched in DCS backstages manual operation separating brake frequency converter input side by staff, if staff should divide
Lock frequency converter input side, which switchs, is not carried out aforementioned separating brake action in (QF1) the 7th preset time from the moment, then from DCS backstages to
Frequency converter input side switch (QF1) sends separating brake instruction；
If in the 8th preset time from sending the separating brake instruction moment to frequency converter input side switch (QF1) on DCS backstages,
Frequency converter control unit and DCS backstages all detect " QF1 gate-dividing states feedback " that frequency converter input side switch (QF1) is sent,
Then judge switch (QF1) separating brake success of frequency converter input side；Otherwise judgement frequency converter input side switch (QF1) separating brake is unsuccessfully gone forward side by side
Then row maintenance repeats above-mentioned steps until input side switch (QF1) separating brake success of judgement frequency converter.
Optionally, when frequency converter control unit sends reclosing command at the moment same period to bypass power frequency switch (QF3)
When, primary air fan baffle opening adjust instruction corresponding with frequency converter frequency it will be sent to executing agency, and executing agency at this time
After the adjust instruction is received, the corresponding baffle opening for adjusting primary air fan.
Optionally, the moment same period refers to phase difference, the frequency of the input side of frequency converter and each single-phase voltage of outlet side
Rate difference and difference in magnitude within a preset range at the time of.
Advantageous effect：
Stable operation method during primary air fan frequency conversion cut frequency of the present invention, in frequency converter normal operation and according to one
When secondary fan operation operating mode judgement is answered during cut frequency or frequency converter breaks down, the motor that can avoid primary air fan is residual
Pressure causes tripping to fail due to high current caused by non-synchronous, so as to prevent the generation of trip accident, and can greatly increase and set
Standby reliability of operation.
Description of the drawings
Fig. 1 is the main electrical scheme schematic diagram of primary air fan provided in an embodiment of the present invention；
The flow of stable operation method when Fig. 2 is a kind of primary air fan frequency conversion cut frequency provided in an embodiment of the present invention
Figure；
The flow of stable operation method when Fig. 3 is another primary air fan frequency conversion cut frequency provided in an embodiment of the present invention
Schematic diagram.
In figure：QF- switchgear houses power frequency switchs；QF1- frequency converters input side switchs；QF2- output side transducers switch；
QF3- bypass power frequency switches；VFD- frequency converters.
Specific embodiment
For those skilled in the art is made to more fully understand technical scheme of the present invention, with reference to the accompanying drawings and examples to this
Invention is described in further detail.
Fig. 1 is the main electrical scheme schematic diagram of primary air fan provided in an embodiment of the present invention, as shown in Figure 1, installing frequency conversion
Device input side switch QF1, output side transducer switch QF2 with bypass power frequency switch QF3, and complete a cable laying it
Afterwards, the ac bus of 6kV is made to switch the defeated of QF1 and frequency converter VFD by switchgear house power frequency switch QF, frequency converter input side successively
Enter end connection, the output terminal of frequency converter VFD switchs the motor connection of QF2 and primary air fan through output side transducer, bypasses work
The both ends of frequency switch QF3 switch QF and the frequency converter input side switch interface of QF1, primary air fan with switchgear house power frequency respectively
Motor connects.
It is described to simplify, " switchgear house power frequency switchs QF " is hereinafter referred to as " QF ", by " frequency converter input side switchs
QF1 " is referred to as " QF1 ", and " output side transducer switchs QF2 " is referred to as " QF2 ", " will bypass power frequency switch QF3 " referred to as
“QF3”。
As one embodiment of the present invention, a kind of stable operation method during primary air fan frequency conversion cut frequency is provided,
As shown in Fig. 2, the operation method includes the following steps S101.
S101. when frequency converter normal operation and according to primary air fan operating condition judgement answer cut frequency when or frequency converter
During failure, make QF2 separating brakes, QF3 combined floodgates and QF1 separating brakes successively, so as to which primary air fan is switched to power frequency operation state.
Wherein, judge whether to answer cut frequency according to primary air fan operating condition specifically, primary air fan load it is larger or
When frequency converter frequency is close to 50Hz, cut frequency is answered in judgement；Otherwise, cut frequently, does not maintain converting operation state.As for primary air fan
Load be specially it is how many be just that load is larger, can be set by those skilled in the art according to actual conditions.
It is described in detail with reference to Fig. 1：
When frequency converter normal operation and when answering cut frequency according to the judgement of primary air fan operating condition, the step of making QF2 separating brakes
Specially：
Separating brake instruction is sent from DCS backstages to QF2；
If in the first preset time from sending the separating brake instruction moment to QF2 on DCS backstages, frequency converter control unit detection
" the QF2 gate-dividing states feedback " sent to QF2 then judges the success of QF2 separating brakes；Otherwise judgement QF2 separating brakes fail and are overhauled,
Then above-mentioned steps are repeated until judgement QF2 separating brake successes.
In the present invention, DCS backstages refer to dcs (Distributed Control System), are hairs
The common control device of power plant, therefore be no longer described in greater detail in the present invention.
When frequency converter normal operation and when answering cut frequency according to the judgement of primary air fan operating condition, the step of QF3 is made to close a floodgate
Specially：
The moment same period is calculated by frequency converter voltage monitoring unit；
Make frequency converter control unit the moment same period to QF3 send reclosing command, and will at this time with frequency converter frequency
Corresponding primary air fan baffle opening adjust instruction is sent to executing agency, and executing agency is after the adjust instruction is received,
The baffle opening of corresponding adjustment primary air fan；
If in the second preset time from the moment same period, frequency converter control unit and DCS backstages all detect QF3
" the QF3 "on" positions feedback " sent, then judge QF3 closing success；Otherwise judgement QF3, which closes a floodgate, fails and is overhauled, then
Above-mentioned steps are repeated until judgement QF3 closing success.
In the present invention, the moment same period refer to the input side of frequency converter and each single-phase voltage of outlet side phase difference,
Difference on the frequency and difference in magnitude within a preset range at the time of.It is sweared by the way that the three-phase to frequency converter voltage and network voltage is single-phase
The comparison of amount can more quickly and accurately find out the moment same period, avoid generating rush of current.It is moreover, mating using frequency converter
Voltage monitoring unit calculate the moment same period, so that frequency converter be made also to be integrated on the basis of with frequency conversion control function together
Phase function does not need to additionally increase synchronous device, has not only reduced cost caused by additional synchronous device, but also can reduce event
Hinder probability, conducive to later maintenance and system operation.Wherein, the input side of frequency converter and the phase difference of each single-phase voltage of outlet side
The preset range of preset range, the preset range of difference on the frequency and difference in magnitude can be carried out by those skilled in the art according to actual conditions
Setting.
When frequency converter normal operation and when answering cut frequency according to the judgement of primary air fan operating condition, the step of making QF1 separating brakes
Specially：
Separating brake QF1 is manually operated on DCS backstages by staff, if third of the staff from the separating brake QF1 moment is answered
Aforementioned separating brake action is not carried out in preset time, then sends separating brake instruction from DCS backstages to QF1；
If DCS backstage to QF1 send separating brake instruction the moment from the 4th preset time in, frequency converter control unit and
DCS backstages all detect " QF1 gate-dividing states feedback " that QF1 is sent, then judge the success of QF1 separating brakes；Otherwise judgement QF1 separating brakes lose
It loses and is overhauled, then repeat above-mentioned steps until judgement QF1 separating brake successes.
When frequency converter breaks down, the step of making QF2 separating brakes, is specially：
From frequency converter control unit and DCS backstages separating brake instruction is sent to QF2；
If in the 5th preset time from sending the separating brake instruction moment to QF2, frequency converter control unit and DCS backstages are all
It detects " QF2 gate-dividing states feedback " that QF2 is sent, then judges the success of QF2 separating brakes；Otherwise judgement QF2 separating brakes failure.
After judgement QF2 separating brakes failure, following steps are further included：
From frequency converter control unit and DCS backstages separating brake instruction is sent to QF1；
If in the 9th preset time from sending the separating brake instruction moment to QF1, frequency converter control unit and DCS backstages are all
It detects " QF1 gate-dividing states feedback " that QF1 is sent, then judges the success of QF1 separating brakes；Otherwise judgement QF1 separating brakes fail and carry out
Then maintenance repeats above-mentioned steps until judgement QF1 separating brake successes.
When frequency converter breaks down, the step of QF3 is made to close a floodgate, is specially：
The moment same period is calculated by frequency converter voltage monitoring unit；
Make frequency converter control unit the moment same period to QF3 send reclosing command, and will at this time with frequency converter frequency
Corresponding primary air fan baffle opening adjust instruction is sent to executing agency, and executing agency is after the adjust instruction is received,
The baffle opening of corresponding adjustment primary air fan；
If in the 6th preset time from the moment same period, frequency converter control unit and DCS backstages all detect QF3
" the QF3 "on" positions feedback " sent, then judge QF3 closing success；Otherwise judgement QF3, which closes a floodgate, fails and is overhauled, then
Above-mentioned steps are repeated until judgement QF3 closing success.
When frequency converter breaks down, the step of making QF1 separating brakes, is specially：
By staff DCS backstage manual operation separating brake QF1, if staff from the separating brake QF1 moment is answered the 7th
Aforementioned separating brake action is not carried out in preset time, then sends separating brake instruction from DCS backstages to QF1；
If DCS backstage to QF1 send separating brake instruction the moment from the 8th preset time in, frequency converter control unit and
DCS backstages all detect " QF1 gate-dividing states feedback " that QF1 is sent, then judge the success of QF1 separating brakes；Otherwise judgement QF1 separating brakes lose
It loses and is overhauled, then repeat above-mentioned steps until judgement QF1 separating brake successes.
The occurrence of above-mentioned first to the 9th preset time can be set by those skilled in the art according to actual conditions.
More preferably, the second preset time and the 6th preset time are 0.5s；Third preset time and the 7th preset time are 30s.
As another embodiment of the present invention, stable operation side during another primary air fan frequency conversion cut frequency is provided
Method, as shown in figure 3, the operation method includes the following steps S201-S228.
S201. in frequency converter operational process, judge frequency converter whether normal operation, if so, illustrate frequency converter fault-free,
Primary air fan is in normal converting operation state, and performs step S202；If not, illustrate that frequency converter breaks down, primary air fan
In frequency conversion malfunction, and perform step S215.
S202. (primary air fan is in normal converting operation state) judged whether according to primary air fan operating condition will be primary
Wind turbine is switched to power frequency operation state by converting operation state, and (such as primary air fan load is larger or frequency converter frequency connects in this way
During nearly 50Hz), then perform step S203；If not, perform step S214.
S203. confirm that power frequency component is cut in frequency conversion by DCS backstages, and switching command is sent to frequency converter control unit, it will
The frequency control mode of primary air fan is adjusted to semiautomatic-mode, so as to which " notice " frequency converter control unit prepares normal switching.
S204. separating brake instruction is sent from DCS backstages to QF2.
S205. judge in the first preset time from sending the separating brake instruction moment to QF2 on DCS backstages, Frequency Converter Control
Whether unit detects " the QF2 gate-dividing states feedback " that QF2 is sent, if so, illustrating the success of QF2 separating brakes, and performs step S206；
If not, illustrate that QF2 separating brakes fail (i.e. QF2 failures), and perform step S213.
S206. the moment same period is calculated by frequency converter voltage monitoring unit, makes frequency converter control unit at the moment same period
Reclosing command is sent, and primary air fan baffle opening adjust instruction corresponding with frequency converter frequency will be sent to and hold at this time to QF3
Row mechanism, and executing agency accordingly adjusts the baffle opening of primary air fan after the adjust instruction is received.
S207. judge in the second preset time (such as 0.5s) from the moment same period, frequency converter control unit and DCS
Whether backstage all detects " the QF3 "on" positions feedback " that QF3 is sent, if the two detects, illustrates QF3 closing success,
Frequency converter is out of service at this time, and performs step S208；Otherwise (that is, at least one in the two do not detect) illustrates that QF3 is closed
Lock fails (i.e. QF3 failures), and performs step S212.
S208. separating brake QF1 is manually operated on DCS backstages by staff, if staff is from the separating brake QF1 moment is answered
Aforementioned separating brake action is not carried out in third preset time (such as 30s), then sends separating brake instruction from DCS backstages to QF1.
S209. judge in the 4th preset time from sending the separating brake instruction moment to QF1 on DCS backstages, Frequency Converter Control
Whether unit and DCS backstages all detect " QF1 gate-dividing states feedback " that QF1 is sent, if the two detects, illustrate QF1
Separating brake success, and perform step S210；Otherwise (that is, at least one in the two do not detect) illustrates the failure of QF1 separating brakes (i.e.
QF1 failures), and perform step S211.
S210. make to show " the semi-automatic handover success signal of frequency converter " on frequency converter and the display panel on DCS backstages, table
The bright semi-automatic handover success of frequency converter.So far, primary air fan is switched to power frequency operation state by normal converting operation state and completes.
S211. it is alerted by DCS backstages, staff is notified to overhaul QF1 switches, after fixing, return to step S208.
S212. it is alerted by DCS backstages, staff is notified to overhaul QF3 switches, after fixing, return to step S206.
S213. it is alerted by DCS backstages, is latched the frequency conversion cut frequency of frequency converter (that is, forbidding primary air fan by converting operation
State is switched to power frequency operation state), staff is notified to overhaul QF2 switches, after fixing, return to step S204.
S214. primary air fan is made to keep converting operation state, i.e.,：The motor of primary air fan is made to be in frequency control shape
State is then back to step S201.At this point, ac bus is connected by QF, QF1, frequency converter, QF2 with the motor of primary air fan,
And QF, QF1 and QF2 are in "on" position, and QF3 is in gate-dividing state.
S215. (primary air fan is in frequency conversion malfunction, should primary air fan be switched to work by converting operation state at this time
Frequency operating status) from frequency converter control unit to DCS, fault-signal is thought highly of in transmission frequency conversion from the background, by the frequency conversion control of primary air fan
Mode processed is adjusted to fully automatic mode, switches when preparing failure so as to " notice " DCS backstages.
S216. from frequency converter control unit and DCS backstages separating brake instruction is sent to QF2.
S217. judge when the 5th from frequency converter control unit and DCS backstages send the separating brake instruction moment to QF2 is default
In, whether frequency converter control unit and DCS backstages all detect " QF2 gate-dividing states feedback " that QF2 is sent, if so, explanation
The success of QF2 separating brakes, and perform step S218；If not, illustrate that QF2 separating brakes fail (i.e. QF2 failures), and perform step S225.
S218. the moment same period is calculated by frequency converter voltage monitoring unit, makes frequency converter control unit at the moment same period
Reclosing command is sent, and primary air fan baffle opening adjust instruction corresponding with frequency converter frequency will be sent to and hold at this time to QF3
Row mechanism, and executing agency accordingly adjusts the baffle opening of primary air fan after the adjust instruction is received.
S219. judge in the 6th preset time (such as 0.5s) from the moment same period, frequency converter control unit and DCS
Whether backstage all detects " the QF3 "on" positions feedback " that QF3 is sent, if the two detects, illustrates QF3 closing success,
Frequency converter is out of service at this time, and performs step S220；Otherwise (that is, at least one in the two do not detect) illustrates that QF3 is closed
Lock fails (i.e. QF3 failures), and performs step S224.
S220. separating brake QF1 is manually operated on DCS backstages by staff, if staff is from the separating brake QF1 moment is answered
Aforementioned separating brake action is not carried out in 7th preset time (such as 30s), then sends separating brake instruction from DCS backstages to QF1.
S221. judge in the 8th preset time from sending the separating brake instruction moment to QF1 on DCS backstages, Frequency Converter Control
Whether unit and DCS backstages all detect " QF1 gate-dividing states feedback " that QF1 is sent, if the two detects, illustrate QF1
Separating brake success, and perform step S222；Otherwise (that is, at least one in the two do not detect) illustrates the failure of QF1 separating brakes (i.e.
QF1 failures), and perform step S223.
S222. make to show " frequency converter Full-automatic cutting changes function signal into " on frequency converter and the display panel on DCS backstages, table
Bright frequency converter automatically switches successfully.So far, primary air fan is switched to power frequency operation state by frequency conversion malfunction and completes.
S223. it is alerted by DCS backstages, staff is notified to overhaul QF1 switches, after fixing, return to step S220.
S224. it is alerted by DCS backstages, staff is notified to overhaul QF3 switches, after fixing, return to step S218.
S225. from frequency converter control unit and DCS backstages separating brake instruction is sent to QF1.
S226. judge to QF1 send separating brake instruction the moment from the 9th preset time in, frequency converter control unit and
DCS backstage whether all detect QF1 send " QF1 gate-dividing states feedback ", if the two detects, illustrate QF1 separating brakes into
Work(can isolate frequency converter, and perform step S227；Otherwise (that is, at least one in the two do not detect), explanation
QF1 separating brakes fail (i.e. QF1 failures), and perform step S228.
S227. locking QF3 closes a floodgate (that is, QF3 is forbidden to close a floodgate), makes to show on frequency converter and the display panel on DCS backstages
" frequency converter automatically switches failure signal " shows the full-automatic handover failure of frequency converter, therefore primary air fan fails by frequency conversion failure
State is switched to power frequency operation state.
S228. it is alerted by DCS backstages, staff is notified to overhaul QF1 switches, after fixing, return to step S225.
In above-mentioned steps S201-S228, compared with prior art, frequency converter, which increases newly, defines DI (On-off signal) points 9
It is a：Frequency converter manual mode, frequency converter semiautomatic-mode, frequency converter fully automatic mode, QF1 "on" positions feedback, QF1 separating brake shapes
State feedback, QF2 "on" positions feedback, QF2 gate-dividing states feedback, QF3 "on" positions feedback, QF3 gate-dividing states feedback；Frequency converter
The newly-increased DO (output switch parameter) that defines puts 6：QF1 reclosing commands, the instruction of QF1 separating brakes, QF2 reclosing commands, QF2 separating brakes instruction,
QF3 reclosing commands, the instruction of QF3 separating brakes.Frequency converter internal control mode newly adds frequency converter manual mode, frequency converter semiautomatic-mode
With frequency converter fully automatic mode.DCS Background controls logic newly adds frequency converter manual mode, frequency converter semiautomatic-mode and frequency converter
Fully automatic mode control logic.
It should be noted that in the correlation step of above two embodiment, the high and low degree of remanent magnetism voltage, Yi Jikai
The actuation time of pass needs the nominal parameter of motor, the nominal parameter of 6kV ac bus, motor according to primary air fan
Protection parameters, in 0%-120% times of rated load of working site, pass through switching tests (frequency conversion cut frequency) and collect
Real data determines.
In addition, before the test, needing to shake QF1, QF2, QF3 to testing position, DCS logics, frequency converter pattern are carried out
Comprehensive experiment ensures that control principle is correct, specifically, carrying out point/experiment of closing a floodgate respectively to QF1, QF2 and QF3, checks respectively
The time divided/closed a floodgate of switch；The motor of primary air fan and fan blade are disengaged, carry out motor frequency change, power frequency rotating examination
It tests.Industrial frequency experiment is switched by multiple frequency conversion, variation of the motor residual voltage with the time is tentatively obtained, with reference to the action of each switch
Time can obtain limiting value and the switching time of phase difference, difference on the frequency and difference in magnitude, and according to the above-mentioned parameter obtained, carry out
Tentatively adjust.Then primary air fan motor with fan blade is connect, carries out bringing onto load experiment, specifically, 20%, 50%,
100%th, under 120% wind turbine load, 3 frequency conversions is respectively carried out and cut industrial frequency experiment, need to ensure that parameter is correct during experiment, control is patrolled
It collects correct.Moreover, there is a situation where tripping, just above-mentioned parameter is suitably adjusted once in frequency conversion cut frequency, so that
It finally being capable of 100% handover success.
It is each single-phase by input side, the outlet side to frequency converter that the present invention can be seen that by above two embodiment
Voltage is monitored, and calculates phase difference, difference on the frequency and the difference in magnitude of both sides voltage in real time, finds phase difference, the frequency of both sides voltage
Rate difference and difference in magnitude within a preset range at the time of (i.e. suitable switching point), which is the moment same period, and in the same period
Moment sends reclosing command to QF3, so as to ensure asynchronous switch-on when switching power frequency, avoids generating excessive dash current, in advance
The generation of anti-trip accident, and same period point is captured using the mode for detecting phase voltage, have switching time short, do not influence system
The advantages of operation, so that primary air fan being capable of stable operation when the automatic cut frequency of high-voltage frequency converter bypasses.It is in addition, of the invention
It uses based on Frequency Converter Control, the cooperation control model supplemented by DCS backstages increases flexibility, and improve stability.
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present and the exemplary implementation that uses
Mode, however the present invention is not limited thereto.For those skilled in the art, in the essence for not departing from the present invention
In the case of refreshing and essence, various changes and modifications can be made therein, these variations and modifications are also considered as protection scope of the present invention.
Claims (10)
1. a kind of stable operation method during primary air fan frequency conversion cut frequency, which is characterized in that ac bus passes through distribution successively
Room power frequency switch (QF), frequency converter input side switch (QF1) are connect with the input terminal of frequency converter, and the output terminal of frequency converter is through frequency conversion
Device output side switch (QF2) is connect with the motor of primary air fan, bypass power frequency switch (QF3) both ends respectively with switchgear house work
Frequency switch (QF) is connected with the interface of frequency converter input side switch (QF1), the motor of primary air fan, the operation method packet
Include following steps：
When frequency converter normal operation and according to primary air fan operating condition judgement answer cut frequency when or frequency converter break down
When, make output side transducer switch (QF2) separating brake, bypass power frequency switch (QF3) combined floodgate and frequency converter input side switch successively
(QF1) separating brake, so as to which primary air fan is switched to power frequency operation state.
2. operation method according to claim 1, which is characterized in that transported when frequency converter normal operation and according to primary air fan
The judgement of row operating mode is when answering cut frequency, and the step of output side transducer is made to switch (QF2) separating brake is specially：
Separating brake instruction is sent from DCS backstages to output side transducer switch (QF2)；
If in the first preset time from sending the separating brake instruction moment to output side transducer switch (QF2) on DCS backstages, frequency conversion
Device control unit detects " the QF2 gate-dividing states feedback " that output side transducer switch (QF2) is sent, then judges that frequency converter exports
Side switch (QF2) separating brake success；Otherwise judgement output side transducer switch (QF2) separating brake fails and is overhauled, and then repeats
Above-mentioned steps are performed until judgement output side transducer switch (QF2) separating brake success.
3. operation method according to claim 1, which is characterized in that transported when frequency converter normal operation and according to primary air fan
The judgement of row operating mode is when answering cut frequency, and the step of bypass power frequency switch (QF3) is made to close a floodgate is specially：
The moment same period is calculated by frequency converter voltage monitoring unit；
Frequency converter control unit is made to send reclosing command to bypass power frequency switch (QF3) at the moment same period；
If in the second preset time from the moment same period, frequency converter control unit and DCS backstages all detect bypass work
" the QF3 "on" positions feedback " that frequency switch (QF3) is sent then judges to bypass power frequency switch (QF3) closing success；Otherwise judgement is other
Road power frequency switch (QF3), which closes a floodgate, to be failed and is overhauled, and then repeats above-mentioned steps until judgement bypass power frequency switch
(QF3) closing success.
4. operation method according to any one of claim 1-3, which is characterized in that when frequency converter normal operation and according to
The judgement of primary air fan operating condition is when answering cut frequency, and the step of frequency converter input side is made to switch (QF1) separating brake is specially：
(QF1) is switched in DCS backstages manual operation separating brake frequency converter input side by staff, if staff is answering separating brake to become
Frequency device input side, which switchs, is not carried out aforementioned separating brake action in the third preset time of (QF1) from the moment, then from DCS from the background to frequency conversion
Device input side switch (QF1) sends separating brake instruction；
If in the 4th preset time from sending the separating brake instruction moment to frequency converter input side switch (QF1) on DCS backstages, frequency conversion
Device control unit and DCS backstages all detect " QF1 gate-dividing states feedback " that frequency converter input side switch (QF1) is sent, then sentence
Determine switch (QF1) separating brake success of frequency converter input side；Otherwise judgement frequency converter input side switch (QF1) separating brake fails and is examined
It repaiies, then repeats above-mentioned steps until input side switch (QF1) separating brake success of judgement frequency converter.
5. operation method according to claim 1, which is characterized in that when frequency converter breaks down, export frequency converter
Side switch (QF2) separating brake the step of be specially：
From frequency converter control unit and DCS backstages separating brake instruction is sent to output side transducer switch (QF2)；
If in the 5th preset time from (QF2) is switched to output side transducer and sends the separating brake instruction moment, Frequency Converter Control
Unit and DCS backstages all detect " QF2 gate-dividing states feedback " that output side transducer switch (QF2) is sent, then judge frequency conversion
The success of device output side switch (QF2) separating brake；Otherwise judgement output side transducer switch (QF2) separating brake failure.
6. operation method according to claim 5, which is characterized in that in judgement output side transducer switch (QF2) separating brake
After failure, following steps are further included：
From frequency converter control unit and DCS backstages separating brake instruction is sent to frequency converter input side switch (QF1)；
If in the 9th preset time from sending the separating brake instruction moment to frequency converter input side switch (QF1), Frequency Converter Control
Unit and DCS backstages all detect " QF1 gate-dividing states feedback " that frequency converter input side switch (QF1) is sent, then judge frequency conversion
Switch (QF1) separating brake success of device input side；Otherwise judgement frequency converter input side switch (QF1) separating brake fails and is overhauled, so
After repeat above-mentioned steps until judgement frequency converter input side switch (QF1) separating brake success.
7. operation method according to claim 1, which is characterized in that when frequency converter breaks down, open bypass power frequency
Closing the step of (QF3) closes a floodgate is specially：
The moment same period is calculated by frequency converter voltage monitoring unit；
Frequency converter control unit is made to send reclosing command to bypass power frequency switch (QF3) at the moment same period；
If in the 6th preset time from the moment same period, frequency converter control unit and DCS backstages all detect bypass work
" the QF3 "on" positions feedback " that frequency switch (QF3) is sent then judges to bypass power frequency switch (QF3) closing success；Otherwise judgement is other
Road power frequency switch (QF3), which closes a floodgate, to be failed and is overhauled, and then repeats above-mentioned steps until judgement bypass power frequency switch
(QF3) closing success.
8. according to the operation method described in claim 5-7, which is characterized in that when frequency converter breaks down, make frequency converter defeated
Entering the step of side switchs (QF1) separating brake is specially：
(QF1) is switched in DCS backstages manual operation separating brake frequency converter input side by staff, if staff is answering separating brake to become
Frequency device input side, which switchs, is not carried out aforementioned separating brake action in the 7th preset time of (QF1) from the moment, then from DCS from the background to frequency conversion
Device input side switch (QF1) sends separating brake instruction；
If in the 8th preset time from sending the separating brake instruction moment to frequency converter input side switch (QF1) on DCS backstages, frequency conversion
Device control unit and DCS backstages all detect " QF1 gate-dividing states feedback " that frequency converter input side switch (QF1) is sent, then sentence
Determine switch (QF1) separating brake success of frequency converter input side；Otherwise judgement frequency converter input side switch (QF1) separating brake fails and is examined
It repaiies, then repeats above-mentioned steps until input side switch (QF1) separating brake success of judgement frequency converter.
9. the operation method according to claim 3 or 7, which is characterized in that when frequency converter control unit is in the same period
Carve to bypass power frequency switch (QF3) send reclosing command when, will primary air fan baffle opening corresponding with frequency converter frequency at this time
Adjust instruction is sent to executing agency, and executing agency accordingly adjusts the baffle of primary air fan after the adjust instruction is received
Aperture.
10. the operation method according to claim 3 or 7, which is characterized in that the moment same period refers to frequency converter
Phase difference, difference on the frequency and the difference in magnitude of input side and each single-phase voltage of outlet side within a preset range at the time of.
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| CN111490538A (en) * | 2020-04-23 | 2020-08-04 | 西安热工研究院有限公司 | Accident switching method suitable for primary air fan frequency conversion/power frequency switching system |
| CN112583326A (en) * | 2020-11-26 | 2021-03-30 | 广州东芝白云菱机电力电子有限公司 | Synchronous switching circuit of frequency converter and synchronous switching method thereof |
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| CN114439767A (en) * | 2021-12-28 | 2022-05-06 | 武汉佳德沃博格风动技术有限公司 | Variable frequency adjusting method of fan |
| CN114977504A (en) * | 2022-06-02 | 2022-08-30 | 国网山东省电力公司泰安供电公司 | Bypass load switch control system |
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