CN105444437A - Coordinated control device for light field fused salt flow adjustment and defocusing adjustment of groove type photo-thermal power station - Google Patents
Coordinated control device for light field fused salt flow adjustment and defocusing adjustment of groove type photo-thermal power station Download PDFInfo
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- CN105444437A CN105444437A CN201510813404.7A CN201510813404A CN105444437A CN 105444437 A CN105444437 A CN 105444437A CN 201510813404 A CN201510813404 A CN 201510813404A CN 105444437 A CN105444437 A CN 105444437A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S50/00—Arrangements for controlling solar heat collectors
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E10/40—Solar thermal energy, e.g. solar towers
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Abstract
The invention relates to the technical field of solar groove type photo-thermal power generation, in particular to a coordinated control device for light field fused salt flow adjustment and defocusing adjustment of a groove type photo-thermal power station. The coordinated control device comprises a heat collecting field flow adjustment control unit, a heat collecting field defocusing adjustment control unit and a central coordinated control unit, wherein the heat collecting field flow adjustment control unit and the heat collecting field defocusing adjustment control unit are connected through a communication network and are connected with the central coordinated control unit. The heat collecting field flow adjustment control unit is used for controlling the flow of a cold tank outlet according to commands of the central coordinated control unit. By means of the coordinated control device, a photo-thermal power generation system is made to guarantee that fused salt stably flows without condensation when solar illumination intensity is poor according to solar illumination intensity differences in time, meanwhile, the temperature of the fused salt is controlled not to exceed the standard when the solar illumination intensity is too high, and therefore the photo-thermal power generation system can stably operate with high efficiency for a long time under complex and diversified weather conditions.
Description
Technical field
The present invention relates to solar groove type photo-thermal power generation technical field, specifically a kind of slot type photo-thermal power station light field flow rate of molten salt with defocus adjustment cooperative control device.
Background technology
Solar energy heating generating a kind ofly concentrates the clean energy resource mode of carrying out scale generating.Trough system is in the middle of current solar energy heating generation mode, technology maturity and commercialization checking degree the highest.Thermal source required for solar energy thermal-power-generating all comes from solar irradiation, and the intensity of illumination of solar irradiation each time point in a day exists very big-difference, and because solar light-heat power-generation system shutdown process is long, complex steps, cost is larger.
When light conditions is moderate, need the outlet temperature being carried out domination set thermal field fuse salt by heat collecting field Flow-rate adjustment, ensure that heat exchanger has higher operating efficiency.And along with the reduction of intensity of illumination, exceedingly reduce fuse salt flow by flow regulator and fuse salt in pipeline may be caused to condense into block.Now how to keep the lasting flowing of fuse salt in pipeline in solar light-heat power-generation system, avoid that condensation phenomenon occurs and seem particularly important.On the other hand, along with the increase of intensity of illumination, the means that the temperature suppressing heat collecting field to export by increasing fuse salt flow rises also can lose efficacy, and at this moment need to introduce heat collecting field and defocus control to avoid fuse salt temperature overtemperature.Due to flow-control with to defocus control be all domination set thermal field outlet temperature, if the two can not be coordinated, by may the competition of generator controller or the frequent switching both causing.
Existing patent such as the patent No. is the Chinese invention patents such as CN201310390655.X, CN201210073483.9, CN201310254824.7 and CN201310035468.X.
Wherein CN201310390655.X is a kind of form utilizing solar energy thermal-power-generating to utilize, and system, not containing heat accumulating portion, does not relate to flow and defocuses cooperation control; And whole system heat transfer medium is water; CN201210073483.9 is the experimental rig of trough type solar heat-collector, only comprises solar-thermal generating system heat collector and associated components thereof, and not design system cooperation control, and apparatus structure has different in the present invention.
CN201310254824.7 is the invention of slot type solar-thermal generating system heat collector (condenser) control method, not identical with the system-level invention control hierarchy that the present invention relates to, the present invention does not relate to Unit Level or component-level controls, and relates generally to each device, the cooperation control of parts.
In sum, above-mentioned patent does not solve the technical problem mentioned in background technology.
Summary of the invention
For avoiding the generation of above-mentioned situation, the present invention proposes a kind of light field flow rate of molten salt of slot type photo-thermal power station and defocuses adjustment cooperative control device.For achieving the above object, technical scheme of the present invention is as follows.
The light field flow rate of molten salt of slot type photo-thermal electric power station system with defocus an adjustment cooperative control device, it is characterized in that:
Slot type photo-thermal power station comprises cold tank, heat collecting field and electricity generation system, described cold tank includes the outlet of cold tank entrance 1, cold tank entrance 2 and cold tank, described heat collecting field comprises heat collecting field outlet 1, heat collecting field outlet 2 and heat collecting field entrance, and described electricity generation system comprises electricity generation system entrance and electricity generation system outlet; Described cold tank outlet is connected to described heat collecting field entrance by pipeline 1, and described cold tank outlet is also provided with melting salt pump A; Described heat collecting field outlet 1 is connected to described electricity generation system entrance by pipeline 2, and described electricity generation system outlet is connected to described cold tank entrance 1 by pipeline 3, and described heat collecting field outlet 2 is connected to described cold tank entrance 2 by pipeline 4.
The light field flow rate of molten salt in slot type photo-thermal power station regulates that cooperative control device comprises heat collecting field Flow-rate adjustment control unit, heat collecting field defocuses regulation unit and Central co-ordination control unit with defocusing.Described heat collecting field Flow-rate adjustment control unit and described heat collecting field defocus regulation unit by communication network, are connected respectively with described Central co-ordination control unit.Described heat collecting field Flow-rate adjustment control unit is according to the flow-control of the complete described cold tank outlet of the instruction of described Central co-ordination control unit.Described defocus that regulation unit completes heat collecting field according to the instruction of described Central co-ordination control unit defocus control.Described Central co-ordination control unit, according to the fuse salt flow path of the FEEDBACK CONTROL heat collecting field of described heat collecting field Flow-rate adjustment control unit, defocuses regulation unit described in the internal regulation state of heat collecting field Flow-rate adjustment control unit being sent to simultaneously.
The flow in slot type photo-thermal power station with defocus adjustment control method for coordinating, it is characterized in that:
Described Central co-ordination control unit to described heat collecting field Flow-rate adjustment control unit setting heat collecting field outlet fuse salt rated temperature is
, according to molten salt characteristics setting melting salt pump maximum stream flow be
and minimum discharge
;
When flow regulating function does not reach in limited time, namely flow does not reach maximum stream flow
time, described Central co-ordination control unit does not start described heat collecting field and defocuses regulation unit and carry out defocusing adjustment, only starts described heat collecting field Flow-rate adjustment control unit and carries out Flow-rate adjustment, domination set thermal field outlet fuse salt temperature
;
When Flow-rate adjustment arrives the upper limit, and intensity of illumination is still when increasing, and described for startup heat collecting field is defocused regulation unit by described Central co-ordination control unit carries out defocusing adjustment, reduces the solar radiation that heat collecting field absorbs, and maintains its outlet temperature of molten salt.
The concrete steps that described heat collecting field Flow-rate adjustment control unit carries out described Flow-rate adjustment are:
A) with heat collecting field outlet fuse salt temperature
for control objectives, with the outlet melting salt pump A flow of described cold tank
for controlled quentity controlled variable; When
time, with
for the outlet melting salt pump A flow of described cold tank
regulate foundation, adoption rate integration control, reduces the theoretical delivery of the outlet melting salt pump A of described cold tank gradually
; When
time, with
for the outlet melting salt pump A flow of described cold tank
regulate foundation, increase the theoretical delivery of the outlet melting salt pump A of described cold tank gradually
;
B) theoretical delivery of melting salt pump A
through maximum stream flow
and minimum discharge
the working control flow of salt pump A is formed after amplitude limit
, namely
;
C) when namely the outlet melting salt pump A flow of described cold tank arrives minimum discharge limit value
, and
time, stop described heat collecting field to export and 1 by pipeline 2, fuse salt is delivered to described electricity generation system entrance, start fuse salt is delivered to described cold tank by described heat collecting field outlet 2 entrance 2 by pipeline 4, the fuse salt loop of---heat collecting field---the cold tank that forms cold tank;
When the outlet melting salt pump A flow of described cold tank is more than minimum discharge limit value
or heat collecting field outlet temperature is more than or equal to rated temperature
time, start described heat collecting field outlet 1, by pipeline 2, fuse salt is delivered to described electricity generation system entrance, stop described heat collecting field to export fuse salt to be delivered to described cold tank by 2 entrance 2 by pipeline 4,---the fuse salt loop of heat collecting field---electricity generation system---cold tank that forms cold tank.
Described heat collecting field defocuses the concrete steps that regulation unit carries out defocusing adjustment:
A) definitions set thermal field defocusing coefficient k(
) represent solar energy that heat collecting field defocuses rear absorption and defocus before the ratio of solar energy that can absorb in theory; K=1 indicates without defocusing, and k=0 represents and defocuses completely,
expressed portion is divided and is defocused; After defocusing coefficient k is issued heat collecting field controller by plant controller, heat collecting field controller can realize defocusing by regulating the orientation of heat collector; Plant controller with heat collecting field defocusing coefficient k for control objectives.
B) when the theoretical delivery of the outlet melting salt pump A of described cold tank
time, defocus adjust flux error
; When
time defocus adjust flux error
;
C) adjustment factor is defocused according to following formulae discovery:
.
The invention has the advantages that:
1, a kind of slot type photo-thermal power station light field flow rate of molten salt with defocus adjustment cooperative control device, photo-thermal is enable to send out dot system in time for Intensity of the sunlight difference, ensure that fuse salt steady flow is noncondensing when Intensity of the sunlight is poor, control fuse salt temperature not overtemperature when Intensity of the sunlight is crossed strong, the system that is beneficial to can be run with high efficiency long-term stability under the various weather conditions of complexity simultaneously.
2, under solar irradiation very fully situation, although flow-control and defocus that to control target be all control fuse salt outlet temperature, under coordinated control mode of the present invention, flow-control uses outlet temperature error as controlling foundation, take flow as controlled quentity controlled variable; And defocusing control use traffic error as control foundation, defocusing coefficient is controlled quentity controlled variable, and it is all not identical with controlled quentity controlled variable that the two controls foundation.Although this makes two kinds of controllers simultaneously in work, the problem that there is not competition mutually and repeatedly switch.
3, when solar irradiation is abundant, rely on Flow-rate adjustment means to realize heat collecting field exit point temperature and control, only when Flow-rate adjustment arrives limit value, defocus and regulate just meeting automatically to start.This control method for coordinating makes photo-thermal power station can ensure fuse salt not overtemperature on the one hand, can reduce to greatest extent to defocus the solar energy loss brought on the other hand, improves operational efficiency.
4, solar irradiation bad or unglazed according to time, rely on switching and the Flow-rate adjustment means of low discharge closed circuit, can ensure that fuse salt steady flow is noncondensing on the one hand, also can reduce system energy loss to greatest extent on the other hand, improve operational efficiency.
Accompanying drawing explanation
Fig. 1 is the slot type photo-thermal Power station structure schematic diagram of application embodiments of the invention.
Fig. 2 is that the light field flow rate of molten salt in the slot type photo-thermal power station of application embodiments of the invention regulates cooperative control device structure chart with defocusing.
Fig. 3 is the schematic diagram of flow regulator in application embodiments of the invention heat collecting field Flow-rate adjustment cooperation control.
Fig. 4 is application embodiments of the invention heat collecting field Flow-rate adjustment cooperation control medium-small flow loop switch logical flow chart.
Fig. 5 regulates cooperation control schematic diagram for application embodiments of the invention defocus.
Fig. 6 is heat collecting field flow, the defocusing coefficient of application embodiments of the invention and exports the situation of change of fuse salt temperature with illumination.
Detailed description of the invention
Embodiment 1
Slot type photo-thermal power station comprises cold tank, heat collecting field and electricity generation system, described cold tank includes the outlet of cold tank entrance 1, cold tank entrance 2 and cold tank, described heat collecting field comprises heat collecting field outlet 1, heat collecting field outlet 2 and heat collecting field entrance, and described electricity generation system comprises electricity generation system entrance and electricity generation system outlet; Described cold tank outlet is connected to described heat collecting field entrance by pipeline 1, and described cold tank outlet is also provided with melting salt pump A; Described heat collecting field outlet 1 is connected to described electricity generation system entrance by pipeline 2, and described electricity generation system outlet is connected to described cold tank entrance 1 by pipeline 3, and described heat collecting field outlet 2 is connected to described cold tank entrance 2 by pipeline 4.
The light field flow rate of molten salt in slot type photo-thermal power station with defocus regulate cooperative control device by heat collecting field Flow-rate adjustment control unit, heat collecting field defocuses regulation unit and Central co-ordination control unit forms.Described heat collecting field Flow-rate adjustment control unit and described heat collecting field defocus regulation unit by communication network, are connected respectively with described Central co-ordination control unit.Described heat collecting field Flow-rate adjustment control unit is according to the flow-control of the complete described cold tank outlet of the instruction of described Central co-ordination control unit.Described defocus that regulation unit completes heat collecting field according to the instruction of described Central co-ordination control unit defocus control.Described Central co-ordination control unit, according to the fuse salt flow path of the FEEDBACK CONTROL heat collecting field of described heat collecting field Flow-rate adjustment control unit, defocuses regulation unit described in the internal regulation state of heat collecting field Flow-rate adjustment control unit being sent to simultaneously.
Described Central co-ordination control unit to described heat collecting field Flow-rate adjustment control unit setting heat collecting field outlet fuse salt rated temperature is
, according to molten salt characteristics setting melting salt pump maximum stream flow be
and minimum discharge
;
When flow regulating function does not reach in limited time, namely flow does not reach maximum stream flow
time, described Central co-ordination control unit does not start described heat collecting field and defocuses regulation unit and carry out defocusing adjustment, only starts described heat collecting field Flow-rate adjustment control unit and carries out Flow-rate adjustment, domination set thermal field outlet fuse salt temperature
;
When Flow-rate adjustment arrives the upper limit, and intensity of illumination is still when increasing, and described for startup heat collecting field is defocused regulation unit by described Central co-ordination control unit carries out defocusing adjustment, reduces the solar radiation that heat collecting field absorbs, and maintains its outlet temperature of molten salt.
Embodiment 2
Slot type photo-thermal power station comprises cold tank, heat collecting field and electricity generation system, described cold tank includes the outlet of cold tank entrance 1, cold tank entrance 2 and cold tank, described heat collecting field comprises heat collecting field outlet 1, heat collecting field outlet 2 and heat collecting field entrance, and described electricity generation system comprises electricity generation system entrance and electricity generation system outlet; Described cold tank outlet is connected to described heat collecting field entrance by pipeline 1, and described cold tank outlet is also provided with melting salt pump A; Described heat collecting field outlet 1 is connected to described electricity generation system entrance by pipeline 2, and described electricity generation system outlet is connected to described cold tank entrance 1 by pipeline 3, and described heat collecting field outlet 2 is connected to described cold tank entrance 2 by pipeline 4.
The light field flow rate of molten salt in slot type photo-thermal power station with defocus regulate cooperative control device by heat collecting field Flow-rate adjustment control unit, heat collecting field defocuses regulation unit and Central co-ordination control unit forms.Described heat collecting field Flow-rate adjustment control unit and described heat collecting field defocus regulation unit by communication network, are connected respectively with described Central co-ordination control unit.Described heat collecting field Flow-rate adjustment control unit is according to the flow-control of the complete described cold tank outlet of the instruction of described Central co-ordination control unit.Described defocus that regulation unit completes heat collecting field according to the instruction of described Central co-ordination control unit defocus control.Described Central co-ordination control unit, according to the fuse salt flow path of the FEEDBACK CONTROL heat collecting field of described heat collecting field Flow-rate adjustment control unit, defocuses regulation unit described in the internal regulation state of heat collecting field Flow-rate adjustment control unit being sent to simultaneously.
The flow in slot type photo-thermal power station with defocus adjustment control method for coordinating, it is characterized in that:
Described Central co-ordination control unit to described heat collecting field Flow-rate adjustment control unit setting heat collecting field outlet fuse salt rated temperature is
, according to molten salt characteristics setting melting salt pump maximum stream flow be
and minimum discharge
;
When flow regulating function does not reach in limited time, namely flow does not reach maximum stream flow
time, described Central co-ordination control unit does not start described heat collecting field and defocuses regulation unit and carry out defocusing adjustment, only starts described heat collecting field Flow-rate adjustment control unit and carries out Flow-rate adjustment, domination set thermal field outlet fuse salt temperature
;
When Flow-rate adjustment arrives the upper limit, and intensity of illumination is still when increasing, and described for startup heat collecting field is defocused regulation unit by described Central co-ordination control unit carries out defocusing adjustment, reduces the solar radiation that heat collecting field absorbs, and maintains its outlet temperature of molten salt.
The concrete steps that described heat collecting field Flow-rate adjustment control unit carries out described Flow-rate adjustment are:
A) with heat collecting field outlet fuse salt temperature
for control objectives, with the outlet melting salt pump A flow of described cold tank
for controlled quentity controlled variable; When
time, with
for the outlet melting salt pump A flow of described cold tank
regulate foundation, adoption rate integration control, reduces the theoretical delivery of the outlet melting salt pump A of described cold tank gradually
; When
time, with
for the outlet melting salt pump A flow of described cold tank
regulate foundation, increase the theoretical delivery of the outlet melting salt pump A of described cold tank gradually
;
B) theoretical delivery of melting salt pump A
through maximum stream flow
and minimum discharge
the working control flow of salt pump A is formed after amplitude limit
, namely
;
C) when namely the outlet melting salt pump A flow of described cold tank arrives minimum discharge limit value
, and
time, stop described heat collecting field to export and 1 by pipeline 2, fuse salt is delivered to described electricity generation system entrance, start fuse salt is delivered to described cold tank by described heat collecting field outlet 2 entrance 2 by pipeline 4, the fuse salt loop of---heat collecting field---the cold tank that forms cold tank;
When the outlet melting salt pump A flow of described cold tank is more than minimum discharge limit value
or heat collecting field outlet temperature is more than or equal to rated temperature
time, start described heat collecting field outlet 1, by pipeline 2, fuse salt is delivered to described electricity generation system entrance, stop described heat collecting field to export fuse salt to be delivered to described cold tank by 2 entrance 2 by pipeline 4,---the fuse salt loop of heat collecting field---electricity generation system---cold tank that forms cold tank.
Embodiment 3
Slot type photo-thermal power station comprises cold tank, heat collecting field and electricity generation system, described cold tank includes the outlet of cold tank entrance 1, cold tank entrance 2 and cold tank, described heat collecting field comprises heat collecting field outlet 1, heat collecting field outlet 2 and heat collecting field entrance, and described electricity generation system comprises electricity generation system entrance and electricity generation system outlet; Described cold tank outlet is connected to described heat collecting field entrance by pipeline 1, and described cold tank outlet is also provided with melting salt pump A; Described heat collecting field outlet 1 is connected to described electricity generation system entrance by pipeline 2, and described electricity generation system outlet is connected to described cold tank entrance 1 by pipeline 3, and described heat collecting field outlet 2 is connected to described cold tank entrance 2 by pipeline 4.
The light field flow rate of molten salt in slot type photo-thermal power station with defocus regulate cooperative control device by heat collecting field Flow-rate adjustment control unit, heat collecting field defocuses regulation unit and Central co-ordination control unit forms.Described heat collecting field Flow-rate adjustment control unit and described heat collecting field defocus regulation unit by communication network, are connected respectively with described Central co-ordination control unit.Described heat collecting field Flow-rate adjustment control unit is according to the flow-control of the complete described cold tank outlet of the instruction of described Central co-ordination control unit.Described defocus that regulation unit completes heat collecting field according to the instruction of described Central co-ordination control unit defocus control.Described Central co-ordination control unit, according to the fuse salt flow path of the FEEDBACK CONTROL heat collecting field of described heat collecting field Flow-rate adjustment control unit, defocuses regulation unit described in the internal regulation state of heat collecting field Flow-rate adjustment control unit being sent to simultaneously.
The flow in slot type photo-thermal power station with defocus adjustment control method for coordinating, it is characterized in that:
Described Central co-ordination control unit to described heat collecting field Flow-rate adjustment control unit setting heat collecting field outlet fuse salt rated temperature is
, according to molten salt characteristics setting melting salt pump maximum stream flow be
and minimum discharge
;
When flow regulating function does not reach in limited time, namely flow does not reach maximum stream flow
time, described Central co-ordination control unit does not start described heat collecting field and defocuses regulation unit and carry out defocusing adjustment, only starts described heat collecting field Flow-rate adjustment control unit and carries out Flow-rate adjustment, domination set thermal field outlet fuse salt temperature
;
When Flow-rate adjustment arrives the upper limit, and intensity of illumination is still when increasing, and described for startup heat collecting field is defocused regulation unit by described Central co-ordination control unit carries out defocusing adjustment, reduces the solar radiation that heat collecting field absorbs, and maintains its outlet temperature of molten salt.
The concrete steps that described heat collecting field Flow-rate adjustment control unit carries out described Flow-rate adjustment are:
A) with heat collecting field outlet fuse salt temperature
for control objectives, with the outlet melting salt pump A flow of described cold tank
for controlled quentity controlled variable; When
time, with
for the outlet melting salt pump A flow of described cold tank
regulate foundation, adoption rate integration control, reduces the theoretical delivery of the outlet melting salt pump A of described cold tank gradually
; When
time, with
for the outlet melting salt pump A flow of described cold tank
regulate foundation, increase the theoretical delivery of the outlet melting salt pump A of described cold tank gradually
;
B) theoretical delivery of melting salt pump A
through maximum stream flow
and minimum discharge
the working control flow of salt pump A is formed after amplitude limit
, namely
;
C) when namely the outlet melting salt pump A flow of described cold tank arrives minimum discharge limit value
, and
time, stop described heat collecting field to export and 1 by pipeline 2, fuse salt is delivered to described electricity generation system entrance, start fuse salt is delivered to described cold tank by described heat collecting field outlet 2 entrance 2 by pipeline 4, the fuse salt loop of---heat collecting field---the cold tank that forms cold tank;
When the outlet melting salt pump A flow of described cold tank is more than minimum discharge limit value
or heat collecting field outlet temperature is more than or equal to rated temperature
time, start described heat collecting field outlet 1, by pipeline 2, fuse salt is delivered to described electricity generation system entrance, stop described heat collecting field to export fuse salt to be delivered to described cold tank by 2 entrance 2 by pipeline 4,---the fuse salt loop of heat collecting field---electricity generation system---cold tank that forms cold tank.
Described heat collecting field defocuses the concrete steps that regulation unit carries out defocusing adjustment:
A) definitions set thermal field defocusing coefficient k(
) represent solar energy that heat collecting field defocuses rear absorption and defocus before the ratio of solar energy that can absorb in theory; K=1 indicates without defocusing, and k=0 represents and defocuses completely,
expressed portion is divided and is defocused; After defocusing coefficient k is issued heat collecting field controller by plant controller, heat collecting field controller can realize defocusing by regulating the orientation of heat collector; Plant controller with heat collecting field defocusing coefficient k for control objectives.
B) when the theoretical delivery of the outlet melting salt pump A of described cold tank
time, defocus adjust flux error
; When
time defocus adjust flux error
;
C) adjustment factor is defocused according to following formulae discovery:
.
Embodiment 4
As shown in Figure 1 this kind of slot type photo-thermal power station light field flow rate of molten salt with defocus adjustment cooperative control device, its key structural feature is: solar-thermal generating system is made up of cold tank, heat collecting field and electricity generation system.The light field flow rate of molten salt in slot type photo-thermal power station with defocus regulate cooperative control device by heat collecting field Flow-rate adjustment control unit, heat collecting field defocuses regulation unit and Central co-ordination control unit forms.
The light field flow rate of molten salt in described slot type photo-thermal power station regulates the feature of cooperative control device to be with defocusing:
The outlet of described cold tank is connected to heat collecting field entrance by pipeline 1, and the outlet of described cold tank is provided with melting salt pump A; Described heat collecting field outlet 1 is connected to described electricity generation system entrance by pipeline 2, and described electricity generation system outlet is connected to the entrance 1 of described cold tank by pipeline 3, and described heat collecting field outlet 2 is connected to the entrance 2 of described cold tank by pipeline 4.
The light field flow rate of molten salt in slot type photo-thermal power station with defocus regulate cooperative control device by heat collecting field Flow-rate adjustment control unit, heat collecting field defocuses regulation unit and Central co-ordination control unit forms.Described heat collecting field Flow-rate adjustment control unit and described heat collecting field defocus regulation unit by communication network, are connected respectively with described Central co-ordination control unit.Described heat collecting field Flow-rate adjustment control unit is according to the flow-control of the complete described cold tank outlet of the instruction of described Central co-ordination control unit.Described defocus that regulation unit completes heat collecting field according to the instruction of described Central co-ordination control unit defocus control.Described Central co-ordination control unit, according to the fuse salt flow path of the FEEDBACK CONTROL heat collecting field of described heat collecting field Flow-rate adjustment control unit, defocuses regulation unit described in the internal regulation state of heat collecting field Flow-rate adjustment control unit being sent to simultaneously.
In heat collecting field Flow-rate adjustment cooperation control, the principle of flow regulator is as shown in Figure 3:
Setting heat collecting field outlet fuse salt rated temperature is
, according to molten salt characteristics setting melting salt pump maximum stream flow be
and minimum discharge
.
A) with heat collecting field outlet fuse salt temperature
for control objectives, with the outlet melting salt pump A flow of described cold tank
for controlled quentity controlled variable.When
time, with
for the outlet melting salt pump A flow of described cold tank
regulate foundation, adoption rate integration control, reduces the theoretical delivery of the outlet melting salt pump A of described cold tank gradually
.When
time, with
for the outlet melting salt pump A flow of described cold tank
regulate foundation, increase the theoretical delivery of the outlet melting salt pump A of described cold tank gradually
.
B) theoretical delivery of melting salt pump A
through maximum stream flow
and minimum discharge
the working control flow of salt pump A is formed after amplitude limit
, namely
.
Embodiment heat collecting field Flow-rate adjustment cooperation control medium-small flow loop switch logical flow chart is as shown in Figure 4:
A) when namely the outlet melting salt pump A flow of described cold tank arrives minimum discharge limit value
, and
time, stop described heat collecting field to export and 1 by pipeline 2, fuse salt is delivered to described electricity generation system entrance, start fuse salt is delivered to described cold tank by described heat collecting field outlet 2 entrance 2 by pipeline 4, the fuse salt loop of---heat collecting field---the cold tank that forms cold tank.
B) when the outlet melting salt pump A flow of described cold tank is more than minimum discharge limit value
or heat collecting field outlet temperature is more than or equal to rated temperature
time, start described heat collecting field outlet 1, by pipeline 2, fuse salt is delivered to described electricity generation system entrance, stop described heat collecting field to export fuse salt to be delivered to described cold tank by 2 entrance 2 by pipeline 4,---the fuse salt loop of heat collecting field---electricity generation system---cold tank that forms cold tank.
As Fig. 5 for application embodiments of the invention defocus adjustment cooperation control schematic diagram is:
A) definitions set thermal field defocusing coefficient k(
) represent solar energy that heat collecting field defocuses rear absorption and defocus before the ratio of solar energy that can absorb in theory.K=1 indicates without defocusing, and k=0 represents and defocuses completely,
expressed portion is divided and is defocused.After defocusing coefficient k is issued heat collecting field controller by plant controller, heat collecting field controller can realize defocusing by regulating the orientation of heat collector.Plant controller with heat collecting field defocusing coefficient k for control objectives.
B) when the theoretical delivery of the outlet melting salt pump A of described cold tank
time, defocus adjust flux error
; When
time defocus adjust flux error
;
C) adjustment factor is defocused according to following formulae discovery:
.
As Fig. 6 can find out this kind for slot type photo-thermal power station heat collecting field Flow-rate adjustment with defocus the Comprehensive Control effect regulating control method for coordinating:
A) in the daytime when Intensity of the sunlight raises gradually, system first-selection maintains heat collecting field outlet temperature of molten salt by regulating cold tank to export flow rate of molten salt; When Flow-rate adjustment arrives the upper limit, and intensity of illumination is still when increasing, and startup is defocused adjustment by heat collecting field, by introducing the adjustment of defocusing coefficient K, reduces the solar radiation that heat collecting field absorbs, and maintains its outlet temperature of molten salt;
B) when Intensity of the sunlight weakens gradually, defocusing coefficient K progressively returns to 1, and system maintains heat collecting field outlet temperature of molten salt by regulating cold tank to export flow rate of molten salt again; When Flow-rate adjustment arrives lower limit, and intensity of illumination is still when reducing, and system will start low discharge and circulate, and heat collecting field output fused salt will not enter hot tank, the fuse salt loop of---heat collecting field---the cold tank that forms cold tank;
C) when reentering in the daytime, system low discharge circulant solution removes, and recovers tank---the fuse salt loop of heat collecting field---electricity generation system---cold tank.
Claims (4)
1. slot type photo-thermal power station light field flow rate of molten salt with defocus adjustment cooperative control device, it is characterized in that: comprise heat collecting field Flow-rate adjustment control unit, heat collecting field defocuses regulation unit and Central co-ordination control unit, described heat collecting field Flow-rate adjustment control unit and described heat collecting field defocus regulation unit by communication network, and Unit two are connected with described Central co-ordination control unit respectively; Described heat collecting field Flow-rate adjustment control unit is according to the flow-control of the complete described cold tank outlet of the instruction of described Central co-ordination control unit, described defocus that regulation unit completes heat collecting field according to the instruction of described Central co-ordination control unit defocus control, described Central co-ordination control unit, according to the fuse salt flow path of the FEEDBACK CONTROL heat collecting field of described heat collecting field Flow-rate adjustment control unit, defocuses regulation unit described in the internal regulation state of heat collecting field Flow-rate adjustment control unit being sent to simultaneously.
2. slot type photo-thermal power station according to claim 1 light field flow rate of molten salt with defocus adjustment cooperative control device, it is characterized in that: described Central co-ordination control unit to described heat collecting field Flow-rate adjustment control unit setting heat collecting field outlet fuse salt rated temperature is
, according to molten salt characteristics setting melting salt pump maximum stream flow be
and minimum discharge
;
When flow regulating function does not reach in limited time, namely flow does not reach maximum stream flow
time, described Central co-ordination control unit does not start described heat collecting field and defocuses regulation unit and carry out defocusing adjustment, only starts described heat collecting field Flow-rate adjustment control unit and carries out Flow-rate adjustment, domination set thermal field outlet fuse salt temperature
;
When Flow-rate adjustment arrives the upper limit, and intensity of illumination is still when increasing, and described for startup heat collecting field is defocused regulation unit by described Central co-ordination control unit carries out defocusing adjustment, reduces the solar radiation that heat collecting field absorbs, and maintains its outlet temperature of molten salt.
3. slot type photo-thermal power station according to claim 2 light field flow rate of molten salt with defocus adjustment cooperative control device, it is characterized in that: the concrete steps that described heat collecting field Flow-rate adjustment control unit carries out described Flow-rate adjustment are:
A) with heat collecting field outlet fuse salt temperature
for control objectives, with the outlet melting salt pump A flow of described cold tank
for controlled quentity controlled variable; When
time, with
for the outlet melting salt pump A flow of described cold tank
regulate foundation, adoption rate integration control, reduces the theoretical delivery of the outlet melting salt pump A of described cold tank gradually
; When
time, with
for the outlet melting salt pump A flow of described cold tank
regulate foundation, increase the theoretical delivery of the outlet melting salt pump A of described cold tank gradually
;
B) theoretical delivery of melting salt pump A
through maximum stream flow
and minimum discharge
the working control flow of salt pump A is formed after amplitude limit
, namely
;
C) when namely the outlet melting salt pump A flow of described cold tank arrives minimum discharge limit value
, and
time, stop described heat collecting field to export and 1 by pipeline 2, fuse salt is delivered to described electricity generation system entrance, start fuse salt is delivered to described cold tank by described heat collecting field outlet 2 entrance 2 by pipeline 4, the fuse salt loop of---heat collecting field---the cold tank that forms cold tank;
When the outlet melting salt pump A flow of described cold tank is more than minimum discharge limit value
or heat collecting field outlet temperature is more than or equal to rated temperature
time, start described heat collecting field outlet 1, by pipeline 2, fuse salt is delivered to described electricity generation system entrance, stop described heat collecting field to export fuse salt to be delivered to described cold tank by 2 entrance 2 by pipeline 4,---the fuse salt loop of heat collecting field---electricity generation system---cold tank that forms cold tank.
4. slot type photo-thermal power station according to claim 2 light field flow rate of molten salt with defocus adjustment cooperative control device, it is characterized in that: described heat collecting field defocuses the concrete steps that regulation unit carries out defocusing adjustment and is:
A) definitions set thermal field defocusing coefficient k,
, the ratio of the solar energy that can absorb in theory before representing solar energy that heat collecting field defocuses rear absorption and defocusing; K=1 indicates without defocusing, and k=0 represents and defocuses completely,
expressed portion is divided and is defocused; After defocusing coefficient k is issued heat collecting field controller by plant controller, heat collecting field controller can realize defocusing by regulating the orientation of heat collector; Plant controller with heat collecting field defocusing coefficient k for control objectives;
B) when the theoretical delivery of the outlet melting salt pump A of described cold tank
time, defocus adjust flux error
; When
time defocus adjust flux error
;
C) adjustment factor is defocused according to following formulae discovery:
.
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