CN106774472A - The frequency conversion energy-saving control method of pumping system is closed to pump for high pressure - Google Patents
The frequency conversion energy-saving control method of pumping system is closed to pump for high pressure Download PDFInfo
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- CN106774472A CN106774472A CN201610999012.9A CN201610999012A CN106774472A CN 106774472 A CN106774472 A CN 106774472A CN 201610999012 A CN201610999012 A CN 201610999012A CN 106774472 A CN106774472 A CN 106774472A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D9/00—Level control, e.g. controlling quantity of material stored in vessel
- G05D9/12—Level control, e.g. controlling quantity of material stored in vessel characterised by the use of electric means
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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
Abstract
The present invention relates to a kind of frequency conversion energy-saving control method for closing pumping system to pump for high pressure, comprise the following steps：(1) in Unit Commitment process and underload section, feed pump carries out the control of high pressure feedwater differential pressure, and high pressure feedwater pitch carries out the control of high pressure steam water-level；(2) in unit operation high load capacity section, feed pump carries out high-pressure steam manifold stage control, while pressing the minimum differential pressure of feedwater in ensureing；High-pressure feed water pitch carries out high pressure water level auxiliary control, i.e., the standard-sized sheet pitch when water level is normal turns down pitch, auxiliary adjustment water level when water level is higher；Middle pressure pitch carries out middle pressure the Water Level Control of Steam.Compared with prior art, the present invention realizes high pressure and controls high pressure water level, the control mode of high-pressure feed water pitch standard-sized sheet, while water pressure on medium voltage network can be taken into account to pump using high pressure to pump conjunction pumping system, the purpose for reducing restriction loss is reached, has made unit operation more energy-conservation.
Description
Technical field
The present invention relates to integrated gas-steam combined cycle power plant equipment, followed for gas-steam combined more particularly, to one kind
Ring unit high pressure closes the frequency conversion energy-saving control method of pumping system to pump.
Background technology
In fuel gas-steam gas-steam combined cycle set, for the waste heat boiler that steam circulation is pressed using three, three
Pressure vapour system is respectively each independent high pressure, middle pressure and low-pressure system.For economy, system dimension, later stage power consumption
Deng from the aspect of, water supply system closes the form of pump frequently with high pressure to pump, i.e. three tunnels feedwater is provided by same feed pump.Give
Water is connected to low-pressure drum to horizontal stand and entrance of water-supplying pump by condensate pump outlet after condensate pre-heater, feed pump
The tap of middle pressure is pressed to horizontal stand in being connected to, and the outlet of feed pump is connected to high-pressure feed water platform.But this form increased it is high,
The coupling of medium voltage network, increases control difficulty.
At present, gas-steam combined cycle set is more as regulating units, and start and stop are frequently and long-term under off rating
Operation, makes the operating pressure to pump design far above actual demand, and the Water Level Control of Steam is met in the way of adjusting valve to throttle
It is required that, restriction loss is serious.To improve the economy of unit operation, the mode to pump frequency conversion operation is followed in gas-steam combined
Extensive use in ring power station.
The most economical method of operation of water supply system is feedwater pitch standard-sized sheet, and the side of steam water-level is adjusted to pump by frequency conversion
Formula, this mode at utmost reduces restriction loss.But due to the minimum operation rotating speed for having permission to pump, in start and stop process
During with underload section water lev el control cannot be carried out to pump because minimum speed is limited.It is also contemplated that senior middle school presses the unit of pump,
High pressure is coupled seriously with medium voltage network, and any one systematic water level or pressure disturbance can all have influence on the stabilization of another system.
Therefore, all cannot really realize that pump water lev el control is given in frequency conversion, can only take differential pressure using the unit of senior middle school's pressing pumping system at present
Control, at the same the water level regulation function of reservation high pressure and middle pressure feedwater tune valve, part reduction restriction loss, control strategy such as Fig. 1,
Shown in Fig. 2 and Fig. 3.
Fig. 1 is feed pump differential pressure control flow.Measurement high-pressure feed water outlet main-piping pressure and HP steam drum pressure, Liang Zheqiu
Difference presses feedwater differential pressure, two deviations to take large values and send into feed pump ratio product as high-pressure feed water differential pressure measurement value, in can similarly obtaining
Sub-controller is controlled computing.Feed pump control high pressure feedwater differential pressure is not less than setting value.
Fig. 2, Fig. 3 are the water lev el control flow of high-pressure feed water pitch and middle pressure feedwater pitch.High pressure feedwater pitch difference
High pressure steam water-level is controlled, and the switching of Three-value control and three blunt quantity control is carried out according to steam flow.
There is high pressure to close pumping system to pump and have the gas-steam combined cycle set of frequency control function big to pump
This control strategy of more options, and high pressure feedwater adjusts valve still to there is larger restriction loss under this control strategy, especially
It is high-pressure system, pressure head is high, flow is big, and the loss caused by throttling is also bigger.Therefore, this control mode does not have maximum limit
The economy of water supply system is improved using variable-frequency control technique in degree ground.
The content of the invention
The purpose of the present invention be exactly provided for the defect for overcoming above-mentioned prior art to exist it is a kind of for high pressure to
Pump closes the frequency conversion energy-saving control method of pumping system, can effectively reduce the throttling of senior middle school's pressure water supply system, particularly high-pressure system
Loss, more existing control method more energy-conservation in the case where system stabilization is ensured.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of frequency conversion energy-saving control method for closing pumping system to pump for high pressure, comprises the following steps：
(1) in Unit Commitment process and underload section, feed pump carries out the control of high pressure feedwater differential pressure, and high pressure is given
Water pitch carries out the control of high pressure steam water-level；
(2) in unit operation high load capacity section, feed pump carries out high-pressure steam manifold stage control, while pressing feedwater minimum in ensureing
Differential pressure；High-pressure feed water pitch carries out bag water level auxiliary control high, i.e., the standard-sized sheet pitch when bag water level high is normal, when water level is higher
Turn down pitch, auxiliary adjustment water level；Middle pressure pitch carries out middle pressure the Water Level Control of Steam.
Described control method is specially：
1) measurement obtains actual high-pressure feed water outlet main pipe and HP steam drum pressure, asks difference to obtain height through processing the latter two
Pressure feedwater differential pressure measurement value one, high-pressure feed water differential pressure setpoint one and measured value one is asked and is multiplied constant coefficient one after differing from and is obtained deviation
Variable one；
2) measurement obtains actual middle pressure feedwater outlet main pipe and middle pressure drum pressure, asks difference to obtain through processing the latter two
Pressure feedwater differential pressure measurement value two, by middle pressure feed water differential pressure setpoint two and measured value two ask it is poor after multiply constant coefficient two and obtain deviation
Variable two；
3) the actual high-voltage steam water-level that measurement is obtained passes through treatment as high-pressure steam manifold stage measured value three, by high pressure vapour
Bag water level settings value three asks difference to obtain deviation variables three with measured value three；
4) the actual high-voltage steam flow and high-pressure feed water flow that measurement is obtained are measured by treatment as high pressure steam flow
Value four and high-pressure feed water flow measurements five, the two multiplies constant coefficient three and obtains deviation variables four after seeking difference, according to feedwater three
The switching situation of momentum control, the selection of deviation variables five adds and or is directly equal to equal to deviation variables three and deviation variables four
Deviation variables three；
5) control mode of feed pump is determined according to unit load, the selection of deviation variables six is equal to deviation variables one or waits
In deviation variables five；
6) deviation variables six take large values as deviation variables seven with deviation variables two；
7) deviation variables seven are input into proportional and integral controller carries out proportional integral regulation computing, and proportional and integral controller is defeated
The signal for going out is delivered to and gives pump frequency conversion device frequency setting executing agency, for realizing giving pump frequency control.
The described switching situation according to feedwater three blunt quantity control, the selection of deviation variables five is equal to deviation variables three and deviation
Variable four plus and or be directly equal to deviation variables three and be specially：
During described feedwater Three-value control, described deviation variables five are equal to deviation variables three；Described feedwater three is rushed
During amount control, deviation variables five be equal to deviation variables three and deviation variables four plus and.
The described control mode that feed pump is determined according to unit load, deviation variables six selection be equal to deviation variables one or
Person is specially equal to deviation variables five：
When the control mode of feed pump is water lev el control, described deviation variables six are equal to deviation variables five, otherwise, institute
The deviation variables six stated are equal to deviation variables one.
Described control method is further comprising the steps of：
8) control mode of high-pressure feed water pitch is determined according to unit load, the selection of high-pressure steam manifold stage setting value five is equal to
High-pressure steam manifold stage setting value three or equal to high-pressure steam manifold stage setting value three and positive bias one plus and, by HP steam drum water
Position setting value five asks difference to obtain deviation variables eight with measured value three；
9) according to the switching situation of feedwater three blunt quantity control, the selection of deviation variables nine is equal to deviation variables eight and deviation variables
Four plus and or equal to deviation variables eight；
10) deviation variables nine are input into proportional and integral controller carries out proportional integral regulation computing, proportional and integral controller
The signal of output delivers to high-pressure feed water and adjusts valve actuating mechanism, for realizing that high-pressure feed water adjusts valve control.
The described control mode that high-pressure feed water pitch is determined according to unit load, high-pressure steam manifold stage setting value five is selected
Equal to high-pressure steam manifold stage setting value three or equal to high-pressure steam manifold stage setting value three and positive bias one plus and be specially：
When the control mode of feed pump is water lev el control, the control mode of high-pressure feed water pitch is bag water level high auxiliary control
System, high-pressure steam manifold stage setting value five be equal to high-pressure steam manifold stage setting value three and positive bias one plus and, otherwise, HP steam drum
Water level settings value five is equal to high-pressure steam manifold stage setting value three.
The described switching situation according to feedwater three blunt quantity control, the selection of deviation variables nine is equal to deviation variables eight and deviation
Variable four plus and or be specially equal to deviation variables eight：
During described feedwater Three-value control, described deviation variables nine are equal to deviation variables eight；
During described feedwater three blunt quantity control, described deviation variables nine be equal to deviation variables eight and deviation variables four plus
With.
Described step 5) and 8) in determine that the control mode of high-pressure feed water pitch is specially according to unit load：
It is more than 25% in unit load, when feedwater pump frequency is more than 40Hz, and high-pressure feed water pitch aperture more than 75%, gives
Water pump control mode is set to water lev el control pattern；25% is less than in unit load, 35Hz, and high-pressure feed water are less than to pump frequency
When pitch aperture is less than 50%, feed pump control mode exits water lev el control pattern.
Compared with prior art, the present invention is applied to gas-steam combined cycle set high pressure and closes pumping system to pump
Method for controlling frequency conversion, realizes high pressure and controls high pressure water level to pump using high pressure to pump conjunction pumping system, and high-pressure feed water pitch is complete
The control mode opened, while water pressure on medium voltage network can be taken into account, has reached the purpose for reducing restriction loss, makes unit operation
More energy-conservation.
Brief description of the drawings
Fig. 1 is existing feed pump differential pressure control flow chart；
Fig. 2 is the water lev el control flow chart of existing high-pressure feed water pitch；
Fig. 3 is the water lev el control flow chart of existing middle pressure feedwater pitch；
Fig. 4 is that high pressure of the present invention gives pump frequency control flow chart to pump conjunction pumping system；
Fig. 5 is that high pressure of the present invention closes pumping system high-pressure feed water tune valve control flow chart to pump；
Fig. 6 is the curve map of pump discharge pressure and feedwater pitch aperture.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is a part of embodiment of the invention, rather than whole embodiments.Based on this hair
Embodiment in bright, the every other reality that those of ordinary skill in the art are obtained on the premise of creative work is not made
Example is applied, should all belong to the scope of protection of the invention.
The operating pressure to pump design is mentioned before commonly greater than actual demand, and this point closes pump in high pressure to pump
Become apparent in system, the middle usual higher pressure water supply system of pressure water supply system pressure margin is bigger.Under general operating condition, work as height
When pressure feed pressure meets upper water requirement, middle pressure feed pressure can meet requirement.
Therefore, high-pressure steam manifold stage is controlled to pump frequency by changing the invention provides one kind, what medium voltage network was followed
Control method, this method is considered to high pressure system, is required with meeting its control.The control method include with
Lower aspect：
(1) in Unit Commitment process and underload section, feed pump carries out the control of high pressure feedwater differential pressure, and high pressure is given
Water pitch carries out the control of high pressure steam water-level.
(2) in unit operation high load capacity section, feed pump carries out high-pressure steam manifold stage control, while pressing feedwater minimum in ensureing
Differential pressure；High-pressure feed water pitch carries out bag water level auxiliary control high, i.e., the standard-sized sheet pitch when bag water level high is normal, when water level is higher
Turn down pitch, auxiliary adjustment water level；Middle pressure pitch carries out middle pressure the Water Level Control of Steam.
Therefore, under this control mode, the high-pressure feed water pitch of high load capacity section is typically in full-gear, to pump work
Pressure reduction, also by the pitch aperture increase under more existing control mode, restriction loss reduces middle pressure feedwater pitch aperture.As schemed
Shown in 6, operating point a is the operating point that high pressure closes constant speed pump in pumping system to pump, and operating point b is that high pressure closes pumping system to pump
The operating point that middle speed-variable pump is controlled using differential pressure, operating point c is that speed-variable pump uses water lev el control during high pressure closes pumping system to pump
Operating point, it will be apparent that, operating point c is bigger compared with operating point a, b valve opening, throttles smaller, more energy-conservation.Simultaneously, this hair
Bright described control method ensure that the upper outlet capacity of middle pressure feedwater, it is ensured that system stabilization.
Gas-steam combined cycle set high pressure to pump close pumping system to pump frequency conversion control in, due to high pressure
Water supply system has coupling, generally by changing to pump frequency control high-pressure feed water and middle pressure to water differential pressure waterborne, by changing
Become high pressure feedwater pitch aperture control high pressure steam water-level.
Optimal improvements of the present invention primarily directed to feedwater VFC strategy.Present invention employs " by changing to pump
FREQUENCY CONTROL high-pressure steam manifold stage, medium voltage network is followed " control method, more existing control method can further reduce to
Water restriction loss, makes unit operation more economical.
It is as follows that the gas-steam combined cycle set high pressure that the present invention is directed to closes pumping system arrangement to pump：Feedwater is by coagulating
Bear water pump discharge and low-pressure drum is connected to after condensate pre-heater to horizontal stand and entrance of water-supplying pump, the middle pressure of feed pump is taken out
Head is pressed to horizontal stand in being connected to, and the outlet of feed pump is connected to high-pressure feed water platform.By high-pressure superheater desuperheating water and high pressure
Road desuperheating water is drawn by high-pressure feed water platform, and reheater desuperheating water is pressed in and drawn to horizontal stand.Feed pump carries converter plant,
Speed regulating control can be carried out.
Fig. 4, Fig. 5 show that gas-steam combined cycle set high pressure closes pumping system to pump frequency control and high pressure to pump
The block diagram of valve control is adjusted in feedwater.As shown in Figure 4, Figure 5, control process of the invention is as follows：
(1), measurement obtains actual high-pressure feed water outlet main pipe and HP steam drum pressure, asks difference to obtain through processing the latter two
High-pressure feed water differential pressure measurement value Δ PE1, definite value system is multiplied after high-pressure feed water differential pressure setpoint Δ PEs1 and measured value Δ PE1 are asked into difference
Number A1 obtains deviation variables Δ 1；
(2), measurement obtains actual middle pressure feedwater outlet main pipe and middle pressure drum pressure, asks difference to obtain through processing the latter two
Middle pressure feedwater differential pressure measurement value Δ PE2, middle pressure is fed water after differential pressure setpoint Δ PEs2 and measured value Δ PE1 seeks difference and multiplies definite value system
Number A2 obtains deviation variables Δ 2；
(3), the actual high-voltage steam water-level that measurement is obtained passes through treatment as high-pressure steam manifold stage measured value LE1, by height
Pressure steam water-level setting value LEs1 and measured value LE1 asks difference to obtain deviation variables Δ 3；The actual high-voltage steam flow that measurement is obtained
With high-pressure feed water flow by treatment as high steam flow measurements FE1 and high-pressure feed water flow measurements FE2, the two is asked
Multiply constant coefficient A3 after difference and obtain deviation variables Δ 4, during feedwater Three-value control, deviation variables Δ 5 is equal to deviation variables Δ 3,
During feedwater three blunt quantity control, deviation variables Δ 5 be equal to deviation variables Δ 3 and deviation variables Δ 4 plus and；
(4), when the control mode of feed pump is water lev el control, deviation variables Δ 6 is equal to deviation variables Δ 5, otherwise etc.
In deviation variables Δ 1；
(5) deviation variables Δ 2 is selected with deviation variables Δ 6 and is worth to deviation variables Δ 7 greatly；
(6) deviation variables Δ 7, is input into proportional and integral controller carries out proportional integral regulation computing, proportional integral regulation
The signal of device output is delivered to and gives pump frequency conversion device frequency setting executing agency, for realizing giving pump frequency control.
(7), when the control mode of feed pump is water lev el control, high-pressure steam manifold stage setting value LEs3 is equal to HP steam drum
Water level settings value LEs1 adds positive bias Δ L；Otherwise it is equal to high-pressure steam manifold stage setting value LEs1；
(8), difference is asked to obtain deviation variables Δ 8 high-pressure steam manifold stage setting value LEs3 and measured value LE1, feed water single pulse
During control, deviation variables Δ 9 is equal to deviation variables Δ 8, and during feedwater three blunt quantity control, deviation variables Δ 9 is equal to deviation variables Δ 8
With deviation variables Δ 4 plus and；
(9) deviation variables Δ 9, is input into proportional and integral controller carries out proportional integral regulation computing, proportional integral regulation
The signal of device output delivers to high-pressure feed water and adjusts valve actuating mechanism, for realizing that high-pressure feed water adjusts valve control.
In step 5 and step 7,25% is more than in unit load, feedwater pump frequency is more than 40Hz, and high-pressure feed water pitch is opened
When degree is more than 75%, feed pump control mode is set to water lev el control pattern；25% is less than in unit load, is less than to pump frequency
35Hz, and high-pressure feed water pitch aperture be less than 50% when, feed pump control mode exits water lev el control pattern.
The above, specific embodiment only of the invention, but protection scope of the present invention is not limited thereto, and it is any
Those familiar with the art the invention discloses technical scope in, various equivalent modifications can be readily occurred in or replaced
Change, these modifications or replacement should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with right
It is required that protection domain be defined.
Claims (8)
1. it is a kind of for high pressure to pump close pumping system frequency conversion energy-saving control method, it is characterised in that comprise the following steps：
(1) in Unit Commitment process and underload section, feed pump carries out the control of high pressure feedwater differential pressure, and high pressure feedwater is adjusted
Door carries out the control of high pressure steam water-level；
(2) in unit operation high load capacity section, feed pump carries out high-pressure steam manifold stage control, while pressing feedwater lowest difference in ensureing
Pressure；High-pressure feed water pitch carries out high pressure water level auxiliary control, i.e., the standard-sized sheet pitch when water level is normal turns down tune when water level is higher
Door, auxiliary adjustment water level；Middle pressure pitch carries out middle pressure the Water Level Control of Steam.
2. it is according to claim 1 it is a kind of for high pressure to pump close pumping system frequency conversion energy-saving control method, its feature
It is that described control method is specially：
1) measurement obtains actual high-pressure feed water outlet main pipe and HP steam drum pressure, through process the latter two ask difference obtain high pressure to
Water differential pressure measurement value one, high-pressure feed water differential pressure setpoint one and measured value one is asked and multiply constant coefficient one after difference and obtain deviation variables
One；
2) measurement obtain actual middle pressure feedwater outlet main pipe and middle pressure drum pressure, through process the latter two ask difference obtain in press to
Water differential pressure measurement value two, feed water differential pressure setpoint two and measured value two of middle pressure to be asked and multiply constant coefficient two after difference and obtain deviation variables
Two；
3) the actual high-voltage steam water-level that measurement is obtained passes through treatment as high-pressure steam manifold stage measured value three, by HP steam drum water
Position setting value three asks difference to obtain deviation variables three with measured value three；
4) the actual high-voltage steam flow and high-pressure feed water flow that measurement is obtained pass through treatment as high steam flow measurements
Four and high-pressure feed water flow measurements five, the two to be asked and multiply constant coefficient three after difference and obtain deviation variables four, according to feedwater three impulses
The switching situation of control, the selection of deviation variables five equal to deviation variables three and deviation variables four plus and or be directly equal to deviation
Variable three；
5) control mode of feed pump is determined according to unit load, the selection of deviation variables six is equal to deviation variables one or equal to inclined
Difference variable five；
6) deviation variables six take large values as deviation variables seven with deviation variables two；
7) deviation variables seven are input into proportional and integral controller carries out proportional integral regulation computing, proportional and integral controller output
Signal is delivered to and gives pump frequency conversion device frequency setting executing agency, for realizing giving pump frequency control.
3. it is according to claim 2 it is a kind of for high pressure to pump close pumping system frequency conversion energy-saving control method, its feature
It is, the described switching situation according to feedwater three blunt quantity control that the selection of deviation variables five is equal to deviation variables three and becomes with deviation
Amount four plus and or be directly equal to deviation variables three and be specially：
During described feedwater Three-value control, described deviation variables five are equal to deviation variables three；Described feedwater three impulses control
When processed, deviation variables five be equal to deviation variables three and deviation variables four plus and.
4. it is according to claim 2 it is a kind of for high pressure to pump close pumping system frequency conversion energy-saving control method, its feature
Be, the described control mode that feed pump is determined according to unit load, deviation variables six selection be equal to deviation variables one or
It is specially equal to deviation variables five：
When the control mode of feed pump is water lev el control, described deviation variables six are equal to deviation variables five, otherwise, described
Deviation variables six are equal to deviation variables one.
5. it is according to claim 2 it is a kind of for high pressure to pump close pumping system frequency conversion energy-saving control method, its feature
It is that described control method is further comprising the steps of：
8) control mode of high-pressure feed water pitch is determined according to unit load, the selection of high-pressure steam manifold stage setting value five is equal to high pressure
Steam water-level setting value three or equal to high-pressure steam manifold stage setting value three and positive bias one plus and, high-pressure steam manifold stage is set
Definite value five asks difference to obtain deviation variables eight with measured value three；
9) according to the switching situation of feedwater three blunt quantity control, the selection of deviation variables nine is equal to deviation variables eight and deviation variables four
Plus and or equal to deviation variables eight；
10) deviation variables nine are input into proportional and integral controller carries out proportional integral regulation computing, proportional and integral controller output
Signal deliver to high-pressure feed water adjust valve actuating mechanism, for realize high-pressure feed water adjust valve control.
6. it is according to claim 5 it is a kind of for high pressure to pump close pumping system frequency conversion energy-saving control method, its feature
It is, the described control mode that high-pressure feed water pitch is determined according to unit load, selection of high-pressure steam manifold stage setting value five etc.
In high-pressure steam manifold stage setting value three or equal to high-pressure steam manifold stage setting value three and positive bias one plus and be specially：
When the control mode of feed pump is water lev el control, the control mode of high-pressure feed water pitch is bag water level high auxiliary control,
High-pressure steam manifold stage setting value five be equal to high-pressure steam manifold stage setting value three and positive bias one plus and, otherwise, HP steam drum water
Position setting value five is equal to high-pressure steam manifold stage setting value three.
7. it is according to claim 5 it is a kind of for high pressure to pump close pumping system frequency conversion energy-saving control method, its feature
It is, the described switching situation according to feedwater three blunt quantity control that the selection of deviation variables nine is equal to deviation variables eight and becomes with deviation
Amount four plus and or be specially equal to deviation variables eight：
During described feedwater Three-value control, described deviation variables nine are equal to deviation variables eight；
During described feedwater three blunt quantity control, described deviation variables nine be equal to deviation variables eight and deviation variables four plus and.
8. it is according to claim 5 it is a kind of for high pressure to pump close pumping system frequency conversion energy-saving control method, its feature
Be, described step 5) and 8) in determine that the control mode of high-pressure feed water pitch is specially according to unit load：
It is more than 25% in unit load, when feedwater pump frequency is more than 40Hz, and high-pressure feed water pitch aperture more than 75%, feed pump
Control mode is set to water lev el control pattern；25% is less than in unit load, 35Hz, and high-pressure feed water pitch are less than to pump frequency
When aperture is less than 50%, feed pump control mode exits water lev el control pattern.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108561875A (en) * | 2018-04-18 | 2018-09-21 | 国网天津市电力公司电力科学研究院 | The control method of boiler drum level in the case of paired running water pump |
| CN109028004A (en) * | 2018-06-22 | 2018-12-18 | 武汉钢铁有限公司 | Peak regulation gas fired-boiler feedwater flow and pressure double-balance control system |
| CN114215730A (en) * | 2021-11-11 | 2022-03-22 | 广东红海湾发电有限公司 | Control method for realizing automatic frequency conversion of condensate pump of large-scale thermal power plant |
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| CN108561875A (en) * | 2018-04-18 | 2018-09-21 | 国网天津市电力公司电力科学研究院 | The control method of boiler drum level in the case of paired running water pump |
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| CN114215730A (en) * | 2021-11-11 | 2022-03-22 | 广东红海湾发电有限公司 | Control method for realizing automatic frequency conversion of condensate pump of large-scale thermal power plant |
| CN114215730B (en) * | 2021-11-11 | 2024-04-19 | 广东红海湾发电有限公司 | Control method for realizing automatic frequency conversion of condensate pump of large-scale thermal power plant |
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