CN106837424A - Screw expander variable speed constant frequency generator system and electricity-generating method - Google Patents
Screw expander variable speed constant frequency generator system and electricity-generating method Download PDFInfo
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- CN106837424A CN106837424A CN201710105190.7A CN201710105190A CN106837424A CN 106837424 A CN106837424 A CN 106837424A CN 201710105190 A CN201710105190 A CN 201710105190A CN 106837424 A CN106837424 A CN 106837424A
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- screw expander
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000005611 electricity Effects 0.000 claims abstract description 13
- 230000005540 biological transmission Effects 0.000 claims abstract description 12
- 230000007246 mechanism Effects 0.000 claims abstract description 12
- 230000033228 biological regulation Effects 0.000 claims description 20
- 238000011897 real-time detection Methods 0.000 claims description 11
- 230000008878 coupling Effects 0.000 claims description 10
- 238000010168 coupling process Methods 0.000 claims description 10
- 238000005859 coupling reaction Methods 0.000 claims description 10
- 230000006641 stabilisation Effects 0.000 claims description 6
- 238000011105 stabilization Methods 0.000 claims description 6
- 238000010248 power generation Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims 1
- 230000008859 change Effects 0.000 abstract description 8
- 239000007789 gas Substances 0.000 description 26
- 230000008569 process Effects 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000004224 protection Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C13/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C1/00—Rotary-piston machines or engines
- F01C1/08—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
- F01C1/12—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type
- F01C1/14—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F01C1/16—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C20/00—Control of, monitoring of, or safety arrangements for, machines or engines
- F01C20/08—Control of, monitoring of, or safety arrangements for, machines or engines characterised by varying the rotational speed
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/04—Control effected upon non-electric prime mover and dependent upon electric output value of the generator
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2101/00—Special adaptation of control arrangements for generators
- H02P2101/20—Special adaptation of control arrangements for generators for steam-driven turbines
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a kind of screw expander variable speed constant frequency generator system, including screw expander, transmission mechanism, asynchronous generator, four-quadrant frequency converter, controller and press feedback device and/or power output feedback device；The output shaft of screw expander is connected by transmission mechanism with the rotor of asynchronous generator；The mains side of four-quadrant frequency converter is connected with power network, and motor side is connected with asynchronous generator；The output end of the output end of press feedback device and/or the power output feedback device is connected with the input of controller；The output end of controller is connected with the signal input part of four-quadrant frequency converter.The invention also discloses a kind of screw expander variable speed constant frequency generator method.The present invention can make screw expander electricity generation system adapt to the change of gas flow, high working efficiency in the case where the inside and outside pressure ratio of screw expander is not changed, and can also realize that high efficiency generates electricity in gas flow very little.
Description
Technical field
The present invention relates to screw expander electricity generation system and electricity-generating method.
Background technology
Screw expander is a kind of prime mover with interior expansion, is widely used in the energy regenerating of compressed gas, can be made
It is Mechanical Driven or prime mover of generating set.Screw expander is used as rotary displacement expanding machine, the volume flow master of entrance
To depend on root diameter, interior volume specific ratio, rotating speed and internal clearance.The conventional no matter supporting synchronous generator of screw expander or
Asynchronous generator, due to being restricted by mains frequency, rotating speed is held essentially constant, therefore the volume flow of entrance is also relatively permanent
It is fixed.Meanwhile, when aperture is designed, the interior volume specific ratio of expanding machine is main to be designed according to outer pressure ratio, so can operationally avoid producing
The situation of expansion and deficient expanding machine was given birth to, so as to realize peak efficiency.
But in actual motion, the low-pressure pipe network being connected due to the outlet with screw expander or the entrance with screw expander
What the gas flow of connected high pressure pipe network always changed, causing the gas flow of screw expander can also change therewith.
To make the gas flow of screw expander and the gas flow of outside network reach balance, it is ensured that the exhaust pressure of screw expander
Power, admission pressure or consistent with the power output and setting value of the generator that screw expander is connected, at present screw rod on the market
Expanding machine is nearly all adjusted using inlet restriction mode to the gas flow of screw expander, i.e., adjust swollen by controller
The admission pressure that the aperture of swollen machine inlet adjustment valve changes screw expander is realized adjusting the gas flow of screw expander
Section.This flow restriction control mode can cause that the admission pressure of screw expander declines, and change outer pressure ratio, original interior volume specific ratio
Current operating condition will be no longer appropriate for, screw expander will produce larger crossing to expand so that screw expander generating set
Efficiency drastically declines.More seriously, it is grid-connected same in order to reach when screw expander generating set is under relatively low efficiency
Step rotating speed, gas flow has to maintain higher level.If gas flow is not enough, generator or cannot be connected to the grid, or
Inverse probability off-the-line.
Additionally, when the supporting synchronous generator of screw expander, it is grid-connected in order to realize, it is desirable to screw expander generating set
Rotating speed control it is more accurate so that the generation frequency of screw expander generating set is consistent with mains frequency can be only achieved it is grid-connected
Condition.Therefore, screw expander entrance needs supporting precision autocontrol valve higher, expensive, operation inconvenience.Work as spiral shell
During the supporting asynchronous generator of bar expanding machine, although without the rotating speed control of degree of precision, but asynchronous generating unit will consume power network
Reactive power, decline power factor of electric network, and there is larger dash current grid-connected moment.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of screw expander variable speed constant frequency generator system, and it can
Screw expander electricity generation system is set to adapt to the change of gas flow, work in the case where the inside and outside pressure ratio of screw expander is not changed
Make efficiency high, and efficient generating can be also realized in gas flow very little.
Another technical problem to be solved by this invention is to provide a kind of screw expander variable speed constant frequency generator method.
In order to solve the above technical problems, the invention provides a kind of screw expander variable speed constant frequency generator system, including spiral shell
Bar expanding machine, transmission mechanism, asynchronous generator, four-quadrant frequency converter, controller and press feedback device and/or output work
Rate feedback device；The output shaft of screw expander is connected by transmission mechanism with the rotor of asynchronous generator；Four-quadrant frequency converter
Mains side connection power network, four-quadrant frequency converter motor side connection asynchronous generator；The output end of press feedback device and/or
The output end of the power output feedback device is connected with the input of controller；Press feedback device is used to arrive real-time detection
Screw expander pressure at expulsion and/or admission pressure feed back to controller, power output feedback device is used to examine in real time
The power output of the asynchronous generator for measuring feeds back to controller；The output end of controller and the signal input of four-quadrant frequency converter
End connection, controller is used for according to pressure at expulsion setting value and pressure at expulsion value of feedback, admission pressure setting value and admission pressure
The power output value of feedback of the power output setting value and asynchronous generator of value of feedback or asynchronous generator calculates four-quadrant
The motor given frequency of frequency converter is limited, and motor given frequency is exported to four-quadrant frequency converter, to control asynchronous generator
Rotor speed.
Above-mentioned screw expander variable speed constant frequency generator system, wherein, controller is used for pressure at expulsion setting value and row
The difference of atmospheric pressure value of feedback obtains motor given frequency after carrying out PID regulations or PI regulations, or admission pressure is set
Value obtains described motor given frequency after carrying out PID regulations or PI regulations with the difference of admission pressure value of feedback, or will
The power output setting value of asynchronous generator carries out PID regulations with the difference of the power output value of feedback of asynchronous generator or PI is adjusted
Motor given frequency is obtained after section.
Present invention also offers a kind of screw expander variable speed constant frequency generator method, including：
Gaseous state power generation medium enters expansion work and the operating of lead-screw expanding machine after screw expander, so as to drive asynchronous generating
Machine operation generates electricity；
The electric energy that asynchronous generator is exported is connected to the grid by four-quadrant frequency converter；
Press feedback device by real-time detection to screw expander pressure at expulsion and/or admission pressure feed back to controller,
And/or power output feedback device by real-time detection to the power output of asynchronous generator feed back to controller；
Controller according to pressure at expulsion setting value and pressure at expulsion value of feedback, admission pressure setting value and admission pressure value of feedback or
Person is that the power output setting value of asynchronous generator and the power output value of feedback of asynchronous generator calculate four-quadrant frequency converter
Motor given frequency, and motor given frequency is exported to four-quadrant frequency converter, four-quadrant frequency converter is given according to the motor
The rotor speed of FREQUENCY CONTROL asynchronous generator, makes the pressure at expulsion stabilization of screw expander in pressure at expulsion setting value, or make
The admission pressure stabilization of screw expander is in the admission pressure setting value, or makes the stable output power of asynchronous generator defeated
Go out set value of the power.
After adopting the above technical scheme, the present invention at least has advantages below：
1st, the present invention is by changing the rotating speed rather than admission pressure of screw expander so that pressure at expulsion, the air inlet of screw expander
The stable output power of pressure or the generator being connected with screw expander is in setting value, it is ensured that the gas flow of screw expander
Balance is reached with the gas flow of outside network, not only with the ability of stronger adaptation gas flow fluctuations, and in unsteady flow
The outer pressure ratio design load of screw expander can be maintained under amount operating mode, so that screw expander operates in greater efficiency point all the time,
In the gas flow off-design of screw expander, remain on and ensure that generated energy higher, while grid-connected hair can be reduced
Minimum screw expander gas flow needed for electricity, grid-connected working condition requirement is low；
2nd, the present invention is set by the motor given frequency to four-quadrant frequency converter, it is convenient to control turning for screw expander
Speed, so as to realize to gas flow or the technological parameter related to gas flow such as power output, pressure at expulsion, admission pressure etc.
Control.As a result of four-quadrant frequency converter, without accurately controlling screw expander rotating speed, and only need to be by frequency converter
Parameter designing is to be capable of achieving grid-connected off-the-line, it is convenient to realize start ＆ shutdown through one key and grid-connected off-the-line, easily, control is simple for grid-connected off-the-line
It is single.Due to it is grid-connected when maximum impact electric current be less than the rated current of generator, impact is not resulted in power network；
3rd, asynchronous generator obtains reactive power from four-quadrant frequency converter, and whole system does not consume the reactive power of power network；
4th, asynchronous generator and power network are isolated into system independent of each other by four-quadrant frequency converter so that asynchronous generator and power network
Will not interfere；The various protections to asynchronous generator can be also conveniently realized using the defencive function of four-quadrant frequency converter.
Brief description of the drawings
Fig. 1 shows that a kind of principle of the first embodiment of screw expander variable speed constant frequency generator system of the invention is illustrated
Figure.
Fig. 2 shows that a kind of principle of the second embodiment of screw expander variable speed constant frequency generator system of the invention is illustrated
Figure.
Fig. 3 shows that a kind of principle of the 3rd embodiment of screw expander variable speed constant frequency generator system of the invention is illustrated
Figure.
Fig. 4 shows that a kind of principle of the fourth embodiment of screw expander variable speed constant frequency generator system of the invention is illustrated
Figure.
Fig. 5 shows the generating of a kind of screw expander variable speed constant frequency generator system of the invention and existing throttling electricity generation system
Amount comparison schematic diagram.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Refer to Fig. 1.A kind of screw expander variable speed constant frequency generator system according to a first embodiment of the present invention, including spiral shell
Bar expanding machine 1, transmission mechanism 2, asynchronous generator 3, four-quadrant frequency converter 4, controller 5, press feedback device 6 and power output
Feedback device 7.
The output shaft of screw expander 1 is connected by transmission mechanism 2 with the rotor of asynchronous generator 3.A kind of specific
In implementation method, transmission mechanism 2 is shaft coupling.In another specific embodiment, transmission mechanism 2 includes the first shaft coupling
Device, second shaft coupling and gear-box.The output shaft of screw expander 1 is connected by first shaft coupling with the input shaft of gear-box,
The output shaft of gear-box is connected by second shaft coupling with the rotor of asynchronous generator 3.Gear-box has matching screw expander 1
With the function of the rotating speed of asynchronous generator 3.
The motor side connection asynchronous generator 3 of four-quadrant frequency converter 4, the mains side of four-quadrant frequency converter 4 is by electrically opening
Device 8 is closed to be connected with power network 9.After the active power of the output of asynchronous generator 3 is through the inversion unit inversion of four-quadrant frequency converter 4,
External electrical network 9 is fed back to by electrical switchgear 8.And the reactive power needed for asynchronous generator 3 is by four-quadrant frequency converter 4
Internal capacitor is provided, the reactive power without consuming power network 9.Electrical switchgear 8 can for example use breaker, but be not limited to
This.
The output end of press feedback device 6 and the output end of power output feedback device 7 connect with the input of controller 5
Connect.In the present embodiment, 6 pressures at expulsion of detection screw expander of press feedback device, press feedback device 6 is used for will be real
When the pressure at expulsion of screw expander 1 that detects feed back to controller 5, power output feedback device 7 is used for real-time detection
To the power output of asynchronous generator 3 feed back to controller 5.In a kind of specific embodiment, press feedback device 6 is
Pressure sensor；Power output feedback device 7 is electric energy meter, and the electric energy meter can be integrated in four-quadrant frequency converter 4, also may be used
To be independently of the electric energy meter of four-quadrant frequency converter 4.
The output end of controller 5 is connected with the signal input part of four-quadrant frequency converter 4, and controller 5 is used for according to exhaust pressure
Power setting value and pressure at expulsion value of feedback or be the power output setting value of asynchronous generator and the output work of asynchronous generator
Rate value of feedback calculates the motor given frequency of four-quadrant frequency converter, and motor given frequency is exported to four-quadrant frequency converter 4,
To control the rotor speed of asynchronous generator 3.Because the rotor of asynchronous generator 3 is connected with screw expander 1, asynchronous generator
3 rotor speed is equal with the rotating speed of screw expander 1, controls the rotor speed of asynchronous generator 3 namely to control screw rod swollen
The rotating speed of swollen machine 1.Because the inlet and outlet pressure of screw expander 1 keeps constant, the change of rotating speed will cause by screw expansion
The change of unit tolerance, so as to match the change of steam consumption, it is ensured that the pressure at expulsion or stable output power of screw expander 1
In setting value.Controller 5 can use PLC, but not limited to this, for example, it is also possible to using the controller of DCS system.
Controller 5 is the gas flow that screw expander is controlled using pressure at expulsion mode or power output mode, by
User uses environments to determination according to screw expander variable speed constant frequency generator system.Controller 5 can be according to external command in row
Switched between atmospheric pressure control mode and output power mode, when controller 5 is in pressure at expulsion control mode,
Pressure at expulsion will be calculated as the process variable to be adjusted, controller 5 according to pressure at expulsion setting value and pressure at expulsion value of feedback
The motor given frequency of the four-quadrant frequency converter 4 for going out is exported to four-quadrant frequency converter 4, and output power is in controller 5
During mode, used as the process variable to be adjusted, controller 5 is by according to the power output setting value of asynchronous generator 3 for power output
And the motor given frequency of four-quadrant frequency converter 4 that the power output value of feedback of asynchronous generator 3 is calculated is exported to four-quadrant
Frequency converter 4.
In the present embodiment, the difference of pressure at expulsion setting value and pressure at expulsion value of feedback is carried out PID regulations by controller 5
After obtain motor given frequency, or by the power output setting value of asynchronous generator 3 and the power output of asynchronous generator 3
The difference of value of feedback obtains motor given frequency after carrying out PID regulations.Controller 5 is provided with control mode switch unit 51, control
Mode switch element 51 is switched over according to external command between pressure at expulsion control mode and output power mode,
When controller 5 is in pressure at expulsion control mode, control mode switch unit 51 will be according to pressure at expulsion setting value and exhaust pressure
The motor given frequency that force feedback value is calculated is exported to four-quadrant frequency converter 4, and output power mode is in controller 5
When, control mode switch unit 51 is by according to the power output of the power output setting value of asynchronous generator 3 and asynchronous generator 3
The motor given frequency that value of feedback is calculated is exported to four-quadrant frequency converter 4.Although it should be noted that adopting in the present embodiment
The mode adjusted with PID, but not limited to this, for example also can be by the way of PI regulations.
Fig. 2 shows that a kind of principle of the second embodiment of screw expander variable speed constant frequency generator system of the invention is illustrated
Figure.The second embodiment is with the difference of first embodiment, the screw expander variable speed constant frequency generator system of second embodiment
Power output feedback device 7 is not provided with, controller 5 controls the gas stream of screw expander only with pressure at expulsion control mode
Amount, i.e. controller 5 are according to the given frequency of motor that pressure at expulsion setting value and pressure at expulsion value of feedback calculate four-quadrant frequency converter 4
Rate, and motor given frequency is exported to four-quadrant frequency converter 4, to control the rotor speed of asynchronous generator 3.
Fig. 3 shows that a kind of principle of the 3rd embodiment of screw expander variable speed constant frequency generator system of the invention is illustrated
Figure.The 3rd embodiment is with the difference of first embodiment, the screw expander variable speed constant frequency generator system of 3rd embodiment
Press feedback device 6 is not provided with, controller 5 controls the gas flow of screw expander only with output power mode, i.e.,
Controller 5 calculates four-quadrant according to the power output setting value of asynchronous generator 3 and the power output value of feedback of asynchronous generator 3
The motor given frequency of frequency converter 4 is limited, and motor given frequency rate is exported to four-quadrant frequency converter 4, to control asynchronous generating
The rotor speed of machine 3.
Fig. 4 shows that a kind of principle of the fourth embodiment of screw expander variable speed constant frequency generator system of the invention is illustrated
Figure.The fourth embodiment is with the difference of first embodiment, the screw expander variable speed constant frequency generator system of fourth embodiment
Power output feedback device 7 is not provided with, controller 5 controls the gas stream of screw expander only with admission pressure control mode
Amount, i.e. 6 admission pressures of detection screw expander of press feedback device, press feedback device 6 is used for arrive real-time detection
The admission pressure of screw expander 1 feeds back to controller 5, and controller 5 is according to admission pressure setting value and admission pressure value of feedback
The motor given frequency of four-quadrant frequency converter 4 is calculated, and motor given frequency is exported to four-quadrant frequency converter 4, to control
The rotor speed of asynchronous generator 3.
Above example is only merely illustrative, in other embodiments, it is also possible to will only detect the air inlet of screw expander
The press feedback device of pressure is combined with power output feedback device, and controller can be according to external command in admission pressure
Switched between control mode and output power mode；Or be that press feedback device can simultaneously detect screw rod
The admission pressure and pressure at expulsion of expanding machine, and controller can be according to external command in admission pressure control mode, pressure at expulsion
Switched between control mode and output power mode.
By taking screw steam pressure-reducing generating set as an example.Assuming that middle pressure steam parameter is 2.5MPaG, 400 DEG C, low-pressure steam
Parameter is 1.0MPaG.In order to realize energy-conservation, the energy produced in decompression process is reclaimed using screw expander.Will be using basis
The embodiment of the present invention 1 is to the screw expander variable speed constant frequency generator system of embodiment 4 and the section of existing use inlet restriction mode
The generated energy for flowing electricity generation system is compared, and its result is as shown in Figure 5.Curve in Fig. 5 it can be clearly seen that using
Existing throttling electricity generation system, steam flow needs to reach 11000kg/h or so and just has electric energy to export.And use according to the present invention
Embodiment 1 to embodiment 3 variable speed constant frequency generator system, steam flow only needs to produce electric energy by 5000kg/h or so, and
Below the operating mode for reaching at full capacity, the generating of the generated energy far above conventional throttling electricity generation system of variable speed constant frequency generator system
Amount.
Present invention also offers a kind of screw expander variable speed constant frequency generator method, comprise the following steps：
Gaseous state power generation medium enters expansion work and the operating of lead-screw expanding machine after screw expander, so as to drive asynchronous generating
Machine operation generates electricity；Above-mentioned gaseous state power generation medium can be working media steam, or natural gas；
The electric energy that asynchronous generator is exported is connected to the grid by four-quadrant frequency converter；Four-quadrant frequency converter real-time inspection power network electricity
Pressure, frequency and phase, and the inversion unit work of control frequency converter accordingly, it is ensured that the electric energy for being exported and line voltage, frequency
And phase is consistent；
Press feedback device by real-time detection to screw expander pressure at expulsion and/or admission pressure feed back to controller,
And/or power output feedback device by real-time detection to the power output of asynchronous generator feed back to controller；
Controller according to pressure at expulsion setting value and pressure at expulsion value of feedback, admission pressure setting value and admission pressure value of feedback or
Person is that the power output setting value of asynchronous generator and the power output value of feedback of asynchronous generator calculate four-quadrant frequency converter
Motor given frequency, and motor given frequency is exported to four-quadrant frequency converter, four-quadrant frequency converter is given according to the motor
The rotor speed of FREQUENCY CONTROL asynchronous generator, makes the pressure at expulsion stabilization of screw expander in pressure at expulsion setting value, or make
The admission pressure stabilization of screw expander is in the admission pressure setting value, or makes the stable output power of asynchronous generator defeated
Go out set value of the power.The output work of the pressure at expulsion setting value, admission pressure setting value and asynchronous generator of screw expander
Rate setting value presets by user according to the use environment of screw expander variable speed constant frequency generator system.
The present invention by change screw expander rotating speed rather than admission pressure so that screw expander pressure at expulsion, enter
The stable output power of atmospheric pressure or the generator being connected with screw expander is in setting value, it is ensured that the gas stream of screw expander
Amount reaches balance with the gas flow of outside network, not only with the ability of stronger adaptation gas flow fluctuations, and is becoming
The outer pressure ratio design load of screw expander can be maintained under flow rate working conditions, so that screw expander operates in greater efficiency all the time
Point, in the gas flow off-design of screw expander, remains on and ensure that generated energy higher.
Claims (10)
1. a kind of screw expander variable speed constant frequency generator system, it is characterised in that including screw expander, transmission mechanism, asynchronous
Generator, four-quadrant frequency converter, controller and press feedback device and/or power output feedback device；
The output shaft of the screw expander is connected by transmission mechanism with the rotor of the asynchronous generator；
The mains side connection power network of the four-quadrant frequency converter, the motor side of the four-quadrant frequency converter connects the asynchronous hair
Motor；
The output end of the output end of the press feedback device and/or the power output feedback device is defeated with the controller
Enter end connection；The press feedback device is used for the pressure at expulsion and/or admission pressure of the screw expander for arriving real-time detection
The controller is fed back to, the power output that the power output feedback device is used for the asynchronous generator for arriving real-time detection is anti-
Feed the controller；
The output end of the controller is connected with the signal input part of the four-quadrant frequency converter, and the controller is used for according to row
Atmospheric pressure setting value and pressure at expulsion value of feedback, admission pressure setting value and admission pressure value of feedback or asynchronous generator
The power output value of feedback of power output setting value and asynchronous generator calculates the given frequency of motor of the four-quadrant frequency converter
Rate, and the motor given frequency is exported to four-quadrant frequency converter, to control the rotor speed of the asynchronous generator.
2. screw expander variable speed constant frequency generator system according to claim 1, it is characterised in that the controller is used for
Described motor is obtained after pressure at expulsion setting value and the difference of pressure at expulsion value of feedback are carried out into PID regulations or PI regulations to give
Frequency, or institute is obtained after the difference of admission pressure setting value and admission pressure value of feedback is carried out into PID regulations or PI regulations
The motor given frequency stated, or the power output of the power output setting value of asynchronous generator and asynchronous generator is fed back
The difference of value obtains described motor given frequency after carrying out PID regulations or PI regulations.
3. screw expander variable speed constant frequency generator system according to claim 1 and 2, it is characterised in that the controller
It is PLC.
4. screw expander variable speed constant frequency generator system according to claim 1, it is characterised in that the pressure feedback dress
Put and be made up of pressure sensor；The power output feedback device is electric energy meter.
5. screw expander variable speed constant frequency generator system according to claim 1, it is characterised in that the four-quadrant frequency conversion
The mains side of device is connected by electrical switchgear with power network.
6. screw expander variable speed constant frequency generator system according to claim 1, it is characterised in that the transmission mechanism is
Shaft coupling.
7. screw expander variable speed constant frequency generator system according to claim 1, it is characterised in that the transmission mechanism includes
First shaft coupling, second shaft coupling and gear-box；The output shaft of the screw expander by the first shaft coupling with it is described
The input shaft connection of gear-box, the rotor that the output shaft of the gear-box passes through the second shaft coupling and the asynchronous generator
Connection.
8. screw expander variable speed constant frequency generator system according to claim 1, it is characterised in that the screw expander becomes
Fast constant frequency generation system includes press feedback device and power output feedback device, and the press feedback device is used to examine in real time
The pressure at expulsion of the screw expander for measuring feeds back to the controller；The controller is used for according to external command in exhaust pressure
Switched between power control mode and output power mode, the pressure at expulsion control mode is in the controller
When, the controller is used for the motor given frequency that will be calculated according to pressure at expulsion setting value and pressure at expulsion value of feedback
Export to the four-quadrant frequency converter, when the controller is in the output power mode, the controller is used for
The motor calculated according to the power output setting value of asynchronous generator and the power output value of feedback of asynchronous generator is given
Rate-adaptive pacemaker is to four-quadrant frequency converter.
9. a kind of screw expander variable speed constant frequency generator method, it is characterised in that including：
Gaseous state power generation medium enters expansion work and the operating of lead-screw expanding machine after screw expander, so as to drive asynchronous generating
Machine operation generates electricity；
The electric energy that asynchronous generator is exported is connected to the grid by four-quadrant frequency converter；
Press feedback device by real-time detection to screw expander pressure at expulsion and/or admission pressure feed back to controller,
And/or power output feedback device by real-time detection to the power output of asynchronous generator feed back to controller；
The controller is according to pressure at expulsion setting value and pressure at expulsion value of feedback, admission pressure setting value and admission pressure feedback
The power output value of feedback of the power output setting value and asynchronous generator of value or asynchronous generator calculates the four-quadrant
The motor given frequency of frequency converter is limited, and the motor given frequency is exported to four-quadrant frequency converter, four-quadrant frequency converter root
The rotor speed of the asynchronous generator is controlled according to the motor given frequency, makes the pressure at expulsion stabilization of screw expander described
Pressure at expulsion setting value, or make the admission pressure stabilization of screw expander in the admission pressure setting value, or make described asynchronous
The stable output power of generator is in the power output setting value.
10. screw expander variable speed constant frequency generator method as claimed in claim 9, it is characterised in that the controller is used for
Described motor is obtained after pressure at expulsion setting value and the difference of pressure at expulsion value of feedback are carried out into PID regulations or PI regulations to give
Frequency, or institute is obtained after the difference of admission pressure setting value and admission pressure value of feedback is carried out into PID regulations or PI regulations
The motor given frequency stated, or the power output of the power output setting value of asynchronous generator and asynchronous generator is fed back
The difference of value obtains described motor given frequency after carrying out PID regulations or PI regulations.
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| CN106837424B (en) | 2023-04-07 |
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