CN108894965A - Feed pump control system - Google Patents
Feed pump control system Download PDFInfo
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- CN108894965A CN108894965A CN201810756668.7A CN201810756668A CN108894965A CN 108894965 A CN108894965 A CN 108894965A CN 201810756668 A CN201810756668 A CN 201810756668A CN 108894965 A CN108894965 A CN 108894965A
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- 238000010248 power generation Methods 0.000 claims abstract description 7
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- 230000033228 biological regulation Effects 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 14
- 230000006641 stabilisation Effects 0.000 abstract description 11
- 238000011105 stabilization Methods 0.000 abstract description 9
- 230000009286 beneficial effect Effects 0.000 abstract description 4
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- 230000015572 biosynthetic process Effects 0.000 description 3
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
Abstract
The invention discloses a kind of feed pump control systems, which is characterized in that the system includes：Steam turbine, feed pump, frequency conversion generator, frequency converter and vapour source switch；Vapour source switch is used to make steam turbine from auxiliary steam source into vapour in the startup stage of feed pump control system, and makes steam turbine from main vapour source into vapour for the working stage in feed pump control system；One end of the axis of the axis connection feed pump of steam turbine, the other end of the axis of feed pump and the axis connection of frequency conversion generator form shafting；Steam turbine is for driving feed pump, and feed pump is for drawing frequency conversion generator power generation；Frequency converter is connect with frequency conversion generator, for controlling the generated output of frequency conversion generator, to control the revolving speed of shafting.The technical solution uses electronic mode that can save mass energy compared in feed pump start-up course, and can realize the stabilization to speed of feedwater, quick, accurate, continuous control in the whole process, and set of system realizes multiple beneficial effects.
Description
Technical field
The present invention relates to feed pump fields, and in particular to feed pump control system.
Background technique
Feed pump is used to be boiler water supply, and common driving style includes steam-operating (Steam Turbine Driven) and electronic (motor
Driving), wherein the feed pump of Large-scale machine set generally uses steam-operating, such as in steam power plant, using the more electronic mode of steam-operating mode
Coal consumption for power generation and station service power consumption rate can be effectively reduced, improve generating efficiency.However, often using electricity in the start-up course of feed pump
, thus still there is energy loss in dynamic rather than steam-operating.
Summary of the invention
In view of the above problems, it proposes on the present invention overcomes the above problem or at least be partially solved in order to provide one kind
State the feed pump control system of problem.
According to one aspect of the present invention, a kind of feed pump control system is provided, including：
Steam turbine, feed pump, frequency conversion generator, frequency converter and vapour source switch；
The vapour source switch is used to make the steam turbine from auxiliary steam in the startup stage of the feed pump control system
Source is into vapour, and for making the steam turbine from main vapour source into vapour in the working stage of the feed pump control system；
One end of the axis of feed pump described in the axis connection of the steam turbine, the other end of the axis of the feed pump and the change
The axis connection of frequency generator forms shafting；The steam turbine includes one into porthole, should be into porthole for connecting the main vapour source
Or the auxiliary steam source；Alternatively, the steam turbine includes two into porthole, it is respectively used to connect the main vapour source and the auxiliary
Vapour source；
The steam turbine is for driving the feed pump, and the feed pump is for drawing the frequency conversion generator power generation；
The frequency converter is connect with the frequency conversion generator, for controlling the generated output of the frequency conversion generator, with control
Make the revolving speed of the shafting.
Optionally, the vapour source switch is used for after feed pump control system starting, determines the feed pump control
System processed enters startup stage；And for acquiring the steam extraction pressure and steam of the main vapour source in the startup stage
Extraction temperature judges whether to meet corresponding preset threshold according to the steam extraction pressure of acquisition and steam extraction temperature；If
Meet, it is determined that the feed pump control system enters working stage.
Optionally, which further includes controller；
The controller is connect with the frequency converter, for exporting target shafting revolving speed to the frequency converter；
The frequency converter is used to change the revolving speed of the frequency conversion generator according to the target shafting revolving speed.
Optionally, the controller is also connect with the steam turbine；
The frequency converter is also used to when the generated output of frequency conversion generator reaches preset threshold, is fed back to the controller
Alarm signal；
The controller is also used to the steam inlet condition of the steam turbine according to the feedback alarm Signal Regulation received.
Optionally, the frequency converter is the four-quadrant frequency converter using power unit cascade topological structure.
Optionally, the four-quadrant frequency converter includes three-phase phase-shifting transformer；
Each secondary side of the three-phase phase-shifting transformer is separately connected a power cell.
Optionally, the power cell is divided into equal three groups of quantity, and the power cell in each group passes through H-bridge inverter circuit
One phase of the series topology structure in series.
Optionally, the system also includes the first high-voltage circuitbreakers and the second high-voltage circuitbreaker；
The frequency converter further includes pre-charging device, and the grid side of the frequency converter can pass through first high-voltage circuitbreaker
It is connect with power grid；
The motor side of the frequency converter is connect by second high-voltage circuitbreaker with the frequency conversion generator.
Optionally, the frequency converter be used for first high-voltage circuitbreaker closure when, by the pre-charging device into
Row charging；And it is cut off from circuit for controlling the pre-charging device in charging complete, and anti-to the controller
Present standby signal；
The controller is also used to after receiving the feedback standby signal, issues enabled instruction to the frequency converter；
The frequency converter is also used to respond the enabled instruction, controls the second high-voltage circuitbreaker closure.
Optionally, first high-voltage circuitbreaker is arranged in the switchgear of frequency-charger cabinet group or in user's switchgear；
Second high-voltage circuitbreaker is arranged in the switchgear of the frequency-charger cabinet group.
It can be seen from the above, technical solution of the present invention, steam turbine, feed pump and the coaxially connected formation axis of frequency conversion generator
System is realized by the switching of vapour source through auxiliary steam source driving steam turbine, and feed pump and frequency conversion generator is driven to complete starting,
Main vapour source is switched to after stabilization, can realize turning for shafting during this by Frequency Converter Control frequency conversion engine power
Speed control, realizes the stabilization of feedwater flow, handoff procedure is smooth, can also equally pass through frequency converter in normal operation
Control frequency conversion engine power is controlled with the revolving speed for realizing shafting, realizes the steady running of unit.The technical solution compared to
Mass energy can be saved using electronic mode in feed pump start-up course, and can realize in the whole process and feed pump is turned
The stabilization of speed, quick, accurate, continuous control, set of system realize multiple beneficial effects.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And it can be implemented in accordance with the contents of the specification, and in order to allow above and other objects of the present invention, feature and advantage can
It is clearer and more comprehensible, the followings are specific embodiments of the present invention.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings：
Fig. 1 shows a kind of structural schematic diagram of feed pump control system according to an embodiment of the invention；
Fig. 2 shows a kind of structural schematic diagrams of four-quadrant frequency converter according to an embodiment of the invention.
Specific embodiment
Exemplary embodiments of the present disclosure are described in more detail below with reference to accompanying drawings.Although showing the disclosure in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
It is limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
It is fully disclosed to those skilled in the art.
Steam-operating mode it is with the obvious advantage, and generally use during startup it is electronic, be because steam-operating mode often make
The high temperature and high pressure steam generated with boiler, is not able to satisfy the normal starting of steam turbine in the steam of startup stage boiler, therefore simultaneously
Be not suitable for start-up course.If using other vapour sources during startup, and vapour source can be generated and switch brought feedwater flow
Big problem is fluctuated, quick, stable low adjustment speed of feedwater is needed.Specifically, in start-up course required feedwater flow compared with
It is small, change greatly, and under traditional feed pump mode of speed regulation, steam feed pump rotational speed regulation range is small, is suitable only for small in high speed
It is adjusted in range.The problem of thus needing to adjust feedwater piping regulating valve, feedwater flow is adjusted in a manner of throttling, is brought is section
The loss of stream is larger, and the surplus especially pumped is bigger, loses bigger.
Therefore, technical concept of the invention is：Increase a set of variable-frequency power generation system to adjust speed of feedwater, overcomes choosing
Start the uncontrollable problem of bring speed regulation with steam-operating mode.
Fig. 1 shows a kind of structural schematic diagram of feed pump control system according to an embodiment of the invention.Such as Fig. 1 institute
Show, feed pump control system 100 includes：
Steam turbine 110, feed pump 120, frequency conversion generator 130, frequency converter 140 and vapour source switch 150.
Vapour source switch 150 is used to make steam turbine 110 from auxiliary steam source into vapour in the startup stage of feed pump control system,
And make steam turbine 110 from main vapour source into vapour for the working stage in feed pump control system.
Specifically, steam turbine 110 can connect a vapour source there are two into porthole respectively.Or only one into porthole,
Vapour source switching, etc. is realized by pipe control.Therefore steam turbine 110 and vapour source switch are shown in phantom in Fig. 1
150 relationship.
One end of the axis of the axis connection feed pump 120 of steam turbine 110, the other end and variable-frequency power generation of the axis of feed pump 120
The axis connection of machine 130 forms shafting.
Steam turbine 110 is for driving feed pump 120, and feed pump 120 is for drawing the power generation of frequency conversion generator 130.
Frequency converter 140 is connect with frequency conversion generator 130, for controlling the generated output of frequency conversion generator 130, with control shaft
The revolving speed of system.
Concrete principle is as follows：
Energy enters feed pump control system with steam, passes to feed pump and frequency conversion generator along axis, driving torque is
The torque T of steam turbineVapour, drag torque by feed pump operation torque TPumpWith the operation torque T of frequency conversion generatorHairTwo parts group
At.Size by changing three above torque can carry out speed regulating control to this shafting.
1) work as TVapour=TPump+THairWhen, shafting working speed is stablized；
2) work as TVapour>TPump+THairWhen, shafting working speed rises.
Generator voltage frequency then T is improved by frequency converterHairReduce, shafting revolving speed rises, TPumpIncrease, is finally reached new
Balance, realize speed of feedwater variation, also just change feedwater flow, meet the needs of actual production.
As it can be seen that system shown in FIG. 1, steam turbine, feed pump and the coaxially connected formation shafting of frequency conversion generator, pass through vapour source
Switching, realize through auxiliary steam source driving steam turbine, drive feed pump and frequency conversion generator to complete starting, switch after stabilization
To main vapour source, the revolving speed control of shafting can be realized during this by Frequency Converter Control frequency conversion engine power, is realized
The stabilization of feedwater flow, handoff procedure is smooth, can also equally be sent out in normal operation by Frequency Converter Control frequency conversion
Motivation power is controlled with the revolving speed for realizing shafting, realizes the steady running of unit.The technical solution is compared in water supply pump startup
Mass energy can be saved using electronic mode in the process, but can realize in the whole process the stabilization to speed of feedwater,
Quickly, accurately, continuous control, set of system realizes multiple beneficial effects.
In one embodiment of the invention, in above system, vapour source switch 150 in feed pump control system for opening
After dynamic, determine that feed pump control system enters startup stage；And for acquiring the steam steam extraction pressure of main vapour source in startup stage
Power and steam extraction temperature judge whether to meet default threshold accordingly according to the steam extraction pressure of acquisition and steam extraction temperature
Value；If being all satisfied, it is determined that feed pump control system enters working stage.
It in the present embodiment, is pressure and temperature two indices by steam to determine whether meeting normal work shape
Standard under state after being all satisfied, then realizes the switching of startup stage to working stage.
In one embodiment of the invention, in above system, which further includes controller (not shown)；Controller with
Frequency converter 140 connects, for exporting target shafting revolving speed to frequency converter 140；Frequency converter 140 is used for according to target shafting revolving speed more
Change the revolving speed of frequency generator 130.
It can be connected by optical fiber between controller and frequency converter 140.Such as frequency converter 140 receives target shafting revolving speed
F1 knows that the revolving speed of current frequency conversion generator 130 is F2, then calculates output frequency according to F1 and F2 and frequency conversion generator generates electricity
Power realizes control.Fine tuning frequency converter output frequency makes shafting stabilization of speed after shafting revolving speed and F1 are almost the same, keeps becoming
Frequency device output frequency and frequency conversion generator generated output make speed of feedwater be maintained at target shafting revolving speed.
Certainly, may also occur being unable to control speed of feedwater in the actual process by frequency conversion generator in target value,
Control can be realized by adjusting steam turbine at this time, i.e., in one embodiment of the invention, in above system, controller is also
It is connect with steam turbine 110；Frequency converter 140 is also used to when the generated output of frequency conversion generator 130 reaches preset threshold, to control
Device feedback alarm signal；Controller is also used to the steam inlet condition according to the feedback alarm Signal Regulation steam turbine 110 received.
For example, working as, generated output in operational process is excessive (being higher than a certain setting value, such as 90% rated power), and frequency converter is anti-
The alarm signal of " generated output transfinites " is presented to controller, after controller receives this alarm signal of frequency converter feedback, is adjusted
It saves steam turbine inlet condition (such as turning pitch aperture down), intervenes speed of feedwater adjustment process, systems stabilisation operation；If operation
Generated output is too small (being lower than a certain setting value, such as 10% rated power) in the process, and frequency converter feeds back the report of " generated output is low "
Alert signal is to controller, after controller receives this alarm signal of frequency converter feedback, adjusting steam turbine inlet condition (such as
Tune up pitch aperture), speed of feedwater adjustment process is intervened, avoids system from absorbing power from power grid, while systems stabilisation is run.
In one embodiment of the invention, in above system, frequency converter 140 is using power unit cascade topological structure
Four-quadrant frequency converter.
Currently, the topological structure of frequency converter has very much, but pass through practical proof, power unit cascade topological structure is humorous
Other topological structures are compared in wave inhibition, device maturity, control technology maturity etc. all has advantage, therefore in this implementation
Frequency converter 140 is the four-quadrant frequency converter using power unit cascade topological structure in example.
In one embodiment of the invention, in above system, four-quadrant frequency converter includes three-phase phase-shifting transformer；Three-phase
Each secondary side of phase-shifting transformer is separately connected a power cell.In one embodiment of the invention, in above system, power
Unit is divided into equal three groups of quantity, and the power cell in each group passes through H-bridge inverter circuit series topology structure in series
One phase.
Fig. 2 shows a kind of structural schematic diagrams of four-quadrant frequency converter according to an embodiment of the invention, such as Fig. 2 institute
Show, four-quadrant frequency converter 200 includes power cell 210 (power cell A1 only having been marked in figure, remaining is not identified), three-phase
Phase-shifting transformer 220.Wherein a1, b1, c1 ... wait as secondary side, respectively connect power cell A1, B1, a C1 ... wherein power list
First A1, A2 ... An is one group, and B1, B2 ... Bn are one group, and C1, C2 ... Cn are one group, forms three-phase.Specific H bridge electricity
Road is not shown, and can use IGBT (Insulated Gate Bipolar Transistor, insulated-gate bipolar transistor npn npn)
It realizes, such as input side forms three phase controllable commutating bridge using IGBT module, outlet side is single-phase controllable using IGBT module composition
Inverter bridge.
In one embodiment of the invention, above system further includes the first high-voltage circuitbreaker and the second high-voltage circuitbreaker；
Frequency converter 140 further includes pre-charging device, and the grid side of frequency converter 140 can be connect by the first high-voltage circuitbreaker with power grid；Become
The motor side of frequency device 140 is connect by the second high-voltage circuitbreaker with frequency conversion generator 130.Pre-charging device 230 is also referred to
Shown in Fig. 2.
Wherein, pre-charging device may include resistance and switch in parallel.In one embodiment of the invention, above-mentioned system
In system, frequency converter 140 is used to charge in the first high-voltage circuitbreaker closure by pre-charging device；And for filling
Control pre-charging device is cut off from circuit when electricity is completed, and feeds back standby signal to controller；Controller is also used to connecing
After receiving feedback standby signal, enabled instruction is issued to frequency converter 140；Frequency converter 140 is also used to respond enabled instruction, control the
Two high-voltage circuitbreakers closure.
In this way, switch disconnects in the first high-voltage circuitbreaker closure, resistance carries out choked flow, is pre-charged, avoids powering on
When excessively electricity damage frequency converter；After frequency converter charges, it can be short-circuited with closure switch, resistance, here it is so-called preliminary filling Densos
It sets and is cut off from circuit.
In one embodiment of the invention, in above system, 140 cabinet group of frequency converter is arranged in the first high-voltage circuitbreaker
In switchgear or in user's switchgear；Second high-voltage circuitbreaker is arranged in the switchgear of 140 cabinet group of frequency converter.
In this way, the closure of the first high-voltage circuitbreaker can be controlled by manual type or Frequency Converter Control, and the second high pressure
Breaker can be automatically controlled by frequency converter, and operation is simple and reliable.
In conclusion technical solution of the present invention, steam turbine, feed pump and the coaxially connected formation shafting of frequency conversion generator,
It by the switching of vapour source, realizes through auxiliary steam source driving steam turbine, drives feed pump and frequency conversion generator to complete starting, steady
Main vapour source is switched to after fixed, can realize the revolving speed control of shafting during this by Frequency Converter Control frequency conversion engine power
System, realizes the stabilization of feedwater flow, handoff procedure is smooth, can also equally pass through Frequency Converter Control in normal operation
Frequency conversion engine power is controlled with the revolving speed for realizing shafting, realizes the steady running of unit.The technical solution is compared in water supply
Mass energy can be saved using electronic mode during pump startup, and can be realized in the whole process to speed of feedwater
Stablize, is quick, accurate, continuous control, set of system realizes multiple beneficial effects.
The above description is merely a specific embodiment, under above-mentioned introduction of the invention, those skilled in the art
Other improvement or deformation can be carried out on the basis of the above embodiments.It will be understood by those skilled in the art that above-mentioned tool
Body description only preferably explains that the purpose of the present invention, protection scope of the present invention should be subject to the protection scope in claims.
Claims (10)
1. a kind of feed pump control system, which is characterized in that the system includes：
Steam turbine, feed pump, frequency conversion generator, frequency converter and vapour source switch；
The vapour source switch be used for the startup stage of the feed pump control system make the steam turbine from auxiliary steam source into
Vapour, and for making the steam turbine from main vapour source into vapour in the working stage of the feed pump control system；The steam turbine
It, should be into porthole for connecting the main vapour source or the auxiliary steam source including one into porthole；Alternatively, the steam turbine includes two
It is a into porthole, be respectively used to connect the main vapour source and the auxiliary steam source；
One end of the axis of feed pump described in the axis connection of the steam turbine, the other end of the axis of the feed pump and frequency conversion hair
The axis connection of motor forms shafting；
The steam turbine is for driving the feed pump, and the feed pump is for drawing the frequency conversion generator power generation；
The frequency converter is connect with the frequency conversion generator, for controlling the generated output of the frequency conversion generator, to control
State the revolving speed of shafting.
2. the system as claimed in claim 1, which is characterized in that the vapour source switch is used in the feed pump control system
After starting, determine that the feed pump control system enters startup stage；And for acquiring the main vapour in the startup stage
The steam extraction pressure and steam extraction temperature in source judge whether full according to the steam extraction pressure of acquisition and steam extraction temperature
The corresponding preset threshold of foot；If being all satisfied, it is determined that the feed pump control system enters working stage.
3. the system as claimed in claim 1, which is characterized in that the system further includes controller；
The controller is connect with the frequency converter, for exporting target shafting revolving speed to the frequency converter；
The frequency converter is used to change the revolving speed of the frequency conversion generator according to the target shafting revolving speed.
4. system as claimed in claim 3, which is characterized in that the controller is also connect with the steam turbine；
The frequency converter is also used to when the generated output of frequency conversion generator reaches preset threshold, to the controller feedback alarm
Signal；
The controller is also used to the steam inlet condition of the steam turbine according to the feedback alarm Signal Regulation received.
5. system as claimed in claim 3, which is characterized in that the frequency converter is using power unit cascade topological structure
Four-quadrant frequency converter.
6. system as claimed in claim 5, which is characterized in that the four-quadrant frequency converter includes three-phase phase-shifting transformer；
Each secondary side of the three-phase phase-shifting transformer is separately connected a power cell.
7. system as claimed in claim 5, which is characterized in that the power cell is divided into equal three groups of quantity, in each group
Power cell pass through a phase of the H-bridge inverter circuit series topology structure in series.
8. system as claimed in claim 3, which is characterized in that the system also includes the first high-voltage circuitbreakers and the second high pressure
Breaker；
The frequency converter further includes pre-charging device, and the grid side of the frequency converter can pass through first high-voltage circuitbreaker and electricity
Net connection；
The motor side of the frequency converter is connect by second high-voltage circuitbreaker with the frequency conversion generator.
9. system as claimed in claim 8, which is characterized in that
The frequency converter is used to charge in first high-voltage circuitbreaker closure by the pre-charging device；And
It is cut off from circuit for controlling the pre-charging device in charging complete, and feeds back standby signal to the controller；
The controller is also used to after receiving the feedback standby signal, issues enabled instruction to the frequency converter；
The frequency converter is also used to respond the enabled instruction, controls the second high-voltage circuitbreaker closure.
10. system as claimed in claim 9, which is characterized in that
First high-voltage circuitbreaker is arranged in the switchgear of frequency-charger cabinet group or in user's switchgear；
Second high-voltage circuitbreaker is arranged in the switchgear of the frequency-charger cabinet group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810756668.7A CN108894965A (en) | 2018-07-11 | 2018-07-11 | Feed pump control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810756668.7A CN108894965A (en) | 2018-07-11 | 2018-07-11 | Feed pump control system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111412023A (en) * | 2020-04-03 | 2020-07-14 | 荣信汇科电气技术有限责任公司 | Coordination control method for realizing stable operation of steam-electricity dual-drive system |
| CN111786387A (en) * | 2020-07-28 | 2020-10-16 | 山东核电有限公司 | Power supply method for electric generating set of reactor coolant pump of AP1000 nuclear power unit |
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