CN106246495B - A kind of photovoltaic water-raising system and its control method - Google Patents
A kind of photovoltaic water-raising system and its control method Download PDFInfo
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- CN106246495B CN106246495B CN201610740052.1A CN201610740052A CN106246495B CN 106246495 B CN106246495 B CN 106246495B CN 201610740052 A CN201610740052 A CN 201610740052A CN 106246495 B CN106246495 B CN 106246495B
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- 238000000034 method Methods 0.000 title claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 170
- 238000004891 communication Methods 0.000 claims abstract description 16
- 238000005286 illumination Methods 0.000 claims description 21
- 230000003247 decreasing effect Effects 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 230000007812 deficiency Effects 0.000 claims description 3
- 230000007958 sleep Effects 0.000 claims description 3
- 241000112598 Pseudoblennius percoides Species 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 239000008400 supply water Substances 0.000 description 5
- 240000000203 Salix gracilistyla Species 0.000 description 2
- 230000005059 dormancy Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/006—Solar operated
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Photovoltaic Devices (AREA)
Abstract
This application discloses a kind of photovoltaic water-raising system and its control method, which includes the host connecting jointly with photovoltaic module array and at least one slave, and host and slave are photovoltaic water pump frequency converter；Host and each slave are connected to corresponding water pump；It is connected between host and each slave using communication line, slave is controlled by host；Host is used to obtain the output power of the photovoltaic module array, with the increase of the output power, successively start the host and the slave, and set the running frequency of host and slave, and/or, with the reduction of the output power, successively stop slave and host, and adjust the running frequency of the host and slave that are currently running.As the sun rises, photovoltaic energy is more and more, and host successively starts slave, so as to increase runing time of the system in one day, improves system to the utilization rate and earning rate of solar energy, shortens the investment return period of owner.
Description
Technical field
The invention belongs to photovoltaic water-raising technical fields, more particularly to a kind of photovoltaic water-raising system and its control method.
Background technique
Photovoltaic water-raising system, suitable for the water supply for the remote districts that power grid does not cover, is removed from using solar energy as power source
It is laid with the investment of power grid or canal for water conveyance, is easy to plan and build, while being also able to achieve the target of energy-saving and emission-reduction, is filled in agricultural
Irrigate, desert treatment, livestock-raising and borderland construction etc., have huge application market.
Current powerful water-raising system is common to be configured to forming battery component serial or parallel connection into an array, configuration one
Platform corresponds to the pump variable frequency device and water pump of power, and the system structure with this configuration mode is simple, easily controllable, still, leads to
Ordinary water pump will realize effective water supply, it is necessary to meet the requirement of lift and flow, that is, needing to run to certain frequency can just have
Effect supplies water, and this requires photovoltaic battery array outputs to reach certain power.Photovoltaic power do not reach certain threshold value it
Before, although water pump has been run, lift is not high enough or flow cannot be not enough discharged greatly, this just will affect the service life of water pump,
Photovoltaic energy is wasted simultaneously, photovoltaic utilization rate and earning rate be not high, and in practical applications, the water pump of this configuration generally needs
Arriving could start to work close to noon.
Another configuration method is that battery component is configured to many independent small arrays, each array is with a set of
The pump variable frequency device and water pump of corresponding power, same every suit mini system also require photovoltaic power reach corresponding starting threshold value it
It is just able to achieve the problem that effective water supply has photovoltaic utilization rate not high as the first configuration method afterwards.
Summary of the invention
To solve the above problems, the present invention provides a kind of photovoltaic water-raising system and its control method, it can be with the sun
It rises, photovoltaic energy is more and more, and host successively starts slave, to increase runing time of the system in one day, to improve
System shortens the investment return period of owner to the utilization rate and earning rate of solar energy.
A kind of photovoltaic water-raising system provided by the invention, comprising:
The host and at least one slave connecting jointly with photovoltaic module array, the host and the slave are photovoltaic
Pump variable frequency device；
The host and each slave are connected to a corresponding water pump；
It is attached between the host and each slave using communication line, and the slave is controlled by the master
Machine；
The host is used to obtain the output power of the photovoltaic module array, with the output of the photovoltaic module array
The increase of power successively starts the host and the slave, and sets the running frequency of the host and slave, and/or, with
The reduction of the output power of the photovoltaic module array, successively stop the slave and the host, and adjust and be currently running
Host and slave running frequency.
Preferably, in above-mentioned photovoltaic water-raising system, suspend mode control unit is provided in the host, for working as the master
Machine controls the master dormant when driving water pump water supply lift deficiency, and the host is restarted after predetermined period.
Preferably, in above-mentioned photovoltaic water-raising system, it is provided with frequency conversion control unit in the host, for working as the light
The output power of volt assembly array increases to when being enough to make more slaves driving water pumps to reach minimum effective water supply lift, opens
It moves more slaves and the host and the output frequency of slave having been started up is down to an equal value, and/
Or, when the output power of the photovoltaic module array is decreased to be not enough to support the slave driving water pump of current quantity to reach minimum
When effective water supply lift, a slave is closed, and the output frequency of the host and currently running slave is increased to one
A equal value.
Preferably, in above-mentioned photovoltaic water-raising system, the host further includes maximal power tracing module, for described
Photovoltaic module array carries out maximal power tracing, controls the photovoltaic module array Maximum Power Output.
Preferably, in above-mentioned photovoltaic water-raising system, the host and the slave are the identical photovoltaic water pump of parameter
Frequency converter.
A kind of control method of photovoltaic water-raising system provided by the invention, the photovoltaic water-raising system include jointly and photovoltaic
Assembly array connection host and at least one slave, the host and the slave are photovoltaic water pump frequency converter, it is described from
Machine connect with the main-machine communication and is controlled by the host, and the host and each slave are connected to corresponding one
Water pump；
The control method includes:
The output power of the photovoltaic module array is obtained by the host；
With the increase of the photovoltaic module array output power, successively start the host and the slave, and set
The running frequency of the host and slave, and/or, with the reduction of the photovoltaic module array output power, successively stop institute
Slave and the host are stated, and adjusts the running frequency of the host and slave that are currently running.
Preferably, described with the photovoltaic module array output work in the control method of above-mentioned photovoltaic water-raising system
The increase of rate successively starts the host and the slave, and sets the running frequency of the slave, and/or, with the light
The reduction for lying prostrate assembly array output power, successively stops the slave and the host, and adjust the host being currently running and from
The running frequency of machine includes:
When starting illumination, the photovoltaic module array output power increases, and controls the host and starts to work, the master
Machine carries out maximal power tracing to the photovoltaic module array, and obtains the photovoltaic module array output work by the host
Rate；
When the photovoltaic module array output power is insufficient to allow the corresponding water pump of the host to reach minimum effective water supply
When lift, the host auto sleep, and the host is restarted with predetermined period；
When the photovoltaic module array output power is enough that the corresponding water pump of the host is made to reach minimum effectively for bigcatkin willow
Cheng Shi, the corresponding water pump water supply start of host-initiated；
It is enough to make the water pump of more slave drivings to reach when the photovoltaic module array output power continues to increase to
When to minimum effective water supply lift, start the operation frequency that more slaves simultaneously set the host and the slave having been started up
The output frequency of rate, the slave for making the host and having been started up is down to an equal value；
It is decreased to be not enough to support the slave of current quantity to drive when illumination weakens to the photovoltaic module array output power
When dynamic water pump reaches minimum effective water supply lift, a slave is closed, and adjust the operation of the host and running slave
Frequency makes the output frequency of the host and currently running slave be increased to an equal value；
When illumination continues to weaken, successively closes each slave and be then shut off the host, be then shut off entire system
System.
Preferably, described when photovoltaic module array output power is enough in the control method of above-mentioned photovoltaic water-raising system
Make when reaching minimum effective water supply lift of the corresponding water pump of the host, the corresponding water pump water supply start of host-initiated
Are as follows:
When the photovoltaic module array output power is enough that the corresponding water pump of the host is made to reach minimum effective work frequency
Rate threshold value f0When, the corresponding water pump water supply start of host-initiated.
Preferably, described to work as the photovoltaic module array output power in the control method of above-mentioned photovoltaic water-raising system
When being enough that the water pump of more slave drivings is made to reach minimum effective water supply lift, starts more slaves and set
The output frequency of the running frequency of the host and the slave having been started up, the slave for making the host and having been started up is down to
One equal value are as follows:
The host and the slave are the photovoltaic water pump frequency converter of parameter having the same, when the photovoltaic module battle array
Column output power increase to make N platform be currently running in total output frequency of photovoltaic water pump frequency converter meet formula:It is greater thanWhen, then continue to start a slave, and the output frequency of the host and the N platform slave being activated is down toWherein, fNFor the output frequency of photovoltaic water pump frequency converter described in the N platform in operating status.
Preferably, described to subtract when illumination weakens to the output power in the control method of above-mentioned photovoltaic water-raising system
When as low as being not enough to support the slave driving water pump of current quantity to reach minimum effective water supply lift, a slave is closed, and adjust
The running frequency of the whole host and running slave increases the host and the output frequency of currently running slave
The value equal to one are as follows:
When the photovoltaic module array output power is decreased to make the fortune of the corresponding water pump of photovoltaic water pump frequency converter described in N platform
Line frequency is close to f0When, a slave is closed, and the output frequency of the host and currently running slave is increased toWherein, fNOutput frequency when being run for photovoltaic water pump frequency converter described in N platform.
As can be seen from the above description, above-mentioned photovoltaic water-raising system provided by the invention and its control method, due to the system
Including the host and at least one slave connecting jointly with photovoltaic module array, the host and the slave are photovoltaic water pump
Frequency converter；The host and each slave are connected to a corresponding water pump；The host and each slave it
Between be attached using communication line, and the slave is controlled by the host；The host is for obtaining the photovoltaic module
The output power of array successively starts the host and the slave with the increase of the output power, and sets the master
The running frequency of machine and slave, and/or, with the reduction of the output power, successively stop the slave and the host, and
Adjust the running frequency of the host and slave that are currently running, it is seen that can rise with the sun, photovoltaic energy is more and more, host
Successively start slave, so as to increase runing time of the system in one day, to improve system to the utilization rate of solar energy
And earning rate, shorten the investment return period of owner.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the schematic diagram of the first photovoltaic water-raising system provided by the embodiments of the present application；
Fig. 2 is the schematic diagram of the control method of the first photovoltaic water-raising system provided by the embodiments of the present application；
Fig. 3 is a kind of schematic diagram of specific photovoltaic water-raising system.
Specific embodiment
Core of the invention thought is to provide a kind of photovoltaic water-raising system and its control method, can be with sun liter
It rises, photovoltaic energy is more and more, and host successively starts slave, to increase runing time of the system in one day, to improve and be
It unites to the utilization rate and earning rate of solar energy, shortens the investment return period of owner.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in FIG. 1, FIG. 1 is provided by the embodiments of the present application for the first photovoltaic water-raising system provided by the embodiments of the present application
The schematic diagram of the first photovoltaic water-raising system.The system includes:
The host 102 and at least one slave 103 being connect jointly with photovoltaic module array 101, the host 102 and described
Slave 103 is photovoltaic water pump frequency converter, wherein photovoltaic module array 101 is by the battery component of entire photovoltaic water-raising system
It is configured to a high-power photovoltaic array according to water pump voltage class series and parallel, according to the needs of field application, it is small to configure more sets
Power photovoltaic water pump frequency converter and water pump, wherein one in photovoltaic water pump frequency converter is used as host, other are as slave, slave
Output frequency given by host, and host and slave can be the type of equal-wattage, be also possible to the type of different capacity,
Herein with no restrictions；
The host 102 and each slave 103 are connected to a corresponding water pump 104；
It is attached between the host 102 and each slave 103 using communication line 105, and the slave 103
Be controlled by the host 102, host 102 by communication line 105 respectively to each slave 103 send start stop signal and it is given from
The running frequency of machine, specifically, can be communicated by CAN, 422, Ethernet or analog quantity mode, it is logical if it is analog quantity
News, then analog quantity is used to control frequency, it is also necessary to the start and stop of digital quantity auxiliary control frequency converter all the way；
The host 102 is used to obtain the output power of the photovoltaic module array 101, with the photovoltaic module array
Output power increase, successively start the host 102 and the slave 103, and set the host 102 and slave 103
Running frequency, and/or, with the reduction of the output power of the photovoltaic module array, successively stop the slave 103 and institute
Host 102 is stated, and adjusts the running frequency of the host 102 and slave 103 that are currently running.
Specifically, setting the general power of the frequency converter motor of photovoltaic water-raising system as P, system, which is realized effectively to supply water, to be reached
Water pump minimum operating frequency is f when minimum effective water supply lift0, i.e., the output frequency of corresponding photovoltaic water pump frequency converter is f0, adopt
With one photovoltaic water pump frequency converter method of conventional arrangement, the corresponding effectively start power of photovoltaic water pump frequency converter are as follows:
Wherein, feFor the rated output frequency of frequency converter, and use the first above-mentioned photovoltaic provided by the embodiments of the present application
Water-raising system, configuration N platform power are P2Pump variable frequency device and water pump, P=N × P2, the effectively start function of every pump variable frequency device
Rate are as follows:
As it can be seen that its effectively start power is only the 1/N of conventional arrangement method, this can starting water pump earlier carry out work
Make, can increase and the time is utilized for solar energy, to improve generated energy.
As can be seen from the above description, the first above-mentioned photovoltaic water-raising system provided by the embodiments of the present application, due to including altogether
With the host connecting with photovoltaic module array and at least one slave, the host and the slave are photovoltaic water pump frequency conversion
Device；The host and each slave are connected to a corresponding water pump；It is sharp between the host and each slave
It is attached with communication line, and the slave is controlled by the host；The host is for obtaining the photovoltaic module array
Output power successively start the host and the slave with the increase of the output power, and set the host and
The running frequency of slave, and/or, with the reduction of the output power, successively stop the slave and the host, and adjust
The running frequency of the host and slave that are currently running, therefore be capable of increasing runing time of the system in one day, to improve and be
It unites to the utilization rate and earning rate of solar energy, shortens the investment return period of owner.
Second of photovoltaic water-raising system provided by the embodiments of the present application is on the basis of the first above-mentioned photovoltaic water-raising system
On, further include following technical characteristic:
Suspend mode control unit is provided in the host, it is lower, described for working as the photovoltaic module array output power
The master dormant is controlled when host driven water pump water supply lift deficiency, and restarts the host after predetermined period.Generally
For, several minutes are set by this predetermined period, if dormancy time is too long, the utilization rate of photovoltaic energy is dropped
It is low, and if dormancy time is too short, frequency converter can frequently switch on machine, reduce the service life of water pump.Suspend mode for a period of time, so
It is just periodically detected afterwards, judges whether photovoltaic module array present output power is enough that water pump is driven to reach minimum effective
Water supply is pumped up water, if reaching, host is started to work, and host driven corresponds to pump operation, if not up to, going successively to suspend mode shape
State is beneficial to energy conservation emission reduction so it is avoided that expending too many energy.
The third photovoltaic water-raising system provided by the embodiments of the present application is on the basis of above-mentioned second of photovoltaic water-raising system
On, further include following technical characteristic:
It is provided with converter unit in the host, is increased to for the output power when the photovoltaic module array and is enough to make
When more slave driving water pumps reach minimum effective water supply lift, start more slaves and by the host and
The output frequency of activated slave is down to an equal value, and/or, when the output power of the photovoltaic module array subtracts
When as low as being not enough to support the slave driving water pump of current quantity to reach minimum effective water supply lift, a slave is closed, and will
The output frequency of the host and currently running slave is increased to an equal value.
In this case, when illumination increases to certain condition, it will be able to start another slave, and drive corresponding
Water pump is started to work, and so on, gradually start more slaves and start to work, when sunlight is weaker, starts lesser amt
Water pump supply water, when sunlight is stronger, starts greater number of water pump and supply water, and under current light intensity,
Under the premise of guaranteeing effectively to supply water, farthest enables water pump and supply water, this can make full use of sunlight just to drive water
Pump, and avoiding a frequency converter in the prior art and a water pump can only can start in the period later daily, cause
The problem of energy waste.
In addition, the control strategy of system closedown are as follows: when illumination weakens, the output power of photovoltaic battery array reduces, when not
When being enough to support the slave of current quantity that water pump is driven to reach minimum effective water supply lift, a set of frequency converter is closed, to promote it
The output frequency for the frequency converter that he is currently running makes system remain valid water supply, when illumination continues to weaken, it is same and so on can
Close entire water-raising system.As it can be seen that the drawbacks of being once shut off whole system in the prior art is avoided in this way, it can be in light
According to weaken when still can utilize existing Driven by Solar Energy respective numbers water pump, thus to a greater extent to solar energy into
Row utilizes, and improves the utilization rate of solar energy.
4th kind of photovoltaic water-raising system provided by the embodiments of the present application, be it is above-mentioned the first to the third photovoltaic water-raising system
In system it is any on the basis of, further include following technical characteristic:
The host further includes maximal power tracing module, for the photovoltaic module array carry out maximum power with
Track controls the photovoltaic module array Maximum Power Output.
In this case, it will be able to guarantee all the time all maximum powers of output array, avoid energy waste.
5th kind of photovoltaic water-raising system provided by the embodiments of the present application, be it is above-mentioned the first to the third photovoltaic water-raising system
In system it is any on the basis of, further include following technical characteristic:
The host and the slave are the identical photovoltaic water pump frequency converter of parameter, are conducive to calculate in start and stop frequency converter
During the respective running frequency that sets, this makes it possible to which respective frequency is preferably arranged, convenient for control.
The control method of the first photovoltaic water-raising system provided by the embodiments of the present application is as shown in Fig. 2, Fig. 2 is that the application is real
The schematic diagram of the control method of the first photovoltaic water-raising system of example offer is provided.The photovoltaic water-raising system includes jointly and photovoltaic
Assembly array connection host and at least one slave, the host and the slave are photovoltaic water pump frequency converter, it is described from
Machine connect with the main-machine communication and is controlled by the host, and the host and each slave are connected to corresponding one
Water pump；
The control method includes the following steps:
S1: the output power of the photovoltaic module array is obtained by the host；
S2: with the increase of the photovoltaic module array output power, successively start the host and the slave, and set
The running frequency of the fixed host and slave, and/or, with the reduction of the photovoltaic module array output power, successively stop
The slave and the host, and adjust the running frequency of the host and slave that are currently running.
Using above-mentioned control method, host can according to the power monitored from start and stop and step by step start and stop slave, and at distribution
In the running frequency of the frequency converter of operating status, as long as photovoltaic module array output power reaches the effectively start function an of water pump
Rate, so that it may start a water pump, and continue working, increase the runing time in system one day, improve photovoltaic water-raising system
The solar energy utilization ratio and earning rate of system can shorten the investment return period of owner.
The control method of second of photovoltaic water-raising system provided by the embodiments of the present application is in the first above-mentioned photovoltaic water-raising
Further include following technical characteristic on the basis of the control method of system:
The increase with the photovoltaic module array output power, successively starts the host and the slave, and
The running frequency of the slave is set, and/or, with the reduction of the photovoltaic module array output power, successively described in stopping
Slave and the host, and the running frequency for adjusting the host and slave that are currently running includes:
When starting illumination, the photovoltaic module array output power increases, and controls the host and starts to work, the master
Machine carries out maximal power tracing to the photovoltaic module array, and obtains the photovoltaic module array output work by the host
Rate；
When the photovoltaic module array output power is insufficient to allow the corresponding water pump of the host to reach minimum effective water supply
When lift, the host auto sleep, and the host is restarted with predetermined period；
When the photovoltaic module array output power is enough that the corresponding water pump of the host is made to reach minimum effectively for bigcatkin willow
Cheng Shi, the corresponding water pump water supply start of host-initiated；
It is enough to make the water pump of more slave drivings to reach when the photovoltaic module array output power continues to increase to
When to minimum effective water supply lift, start the operation frequency that more slaves simultaneously set the host and the slave having been started up
The output frequency of rate, the slave for making the host and having been started up is down to an equal value；
It is decreased to be not enough to support the slave of current quantity to drive when illumination weakens to the photovoltaic module array output power
When dynamic water pump reaches minimum effective water supply lift, a slave is closed, and adjust the operation of the host and running slave
Frequency makes the output frequency of the host and currently running slave be increased to an equal value；
When illumination continues to weaken, successively closes each slave and be then shut off the host, be then shut off entire system
System.
In this step, photovoltaic power occurs fluctuation and frequently switches on slave in order to prevent, and certain stagnant ring can be set,
This stagnant ring parameter can be defined as a constant, such as the 20% of rated frequency, it is assumed that rated frequency 50HZ, then stagnant ring is joined
Number can be set to 10Hz, then carry out judging every time output power whether increase to when being enough the more slave of effectively start or
When whether person's output power is decreased to be not enough to support the slave driving water pump of current quantity to reach minimum effective water supply lift, use
In the frequency (f that the standard of the minimum effective running frequency of water pump judged is after the setting of stagnant ring0+10HZ)。
The control method of the third photovoltaic water-raising system provided by the embodiments of the present application is in above-mentioned second of photovoltaic water-raising
Further include following technical characteristic on the basis of the control method of system:
It is described when what photovoltaic module array output power was enough to make the corresponding water pump of the host reaches minimum effective water supply
When lift, the corresponding water pump water supply start of host-initiated are as follows:
When the photovoltaic module array output power is enough that the corresponding water pump of the host is made to reach minimum effective work frequency
Rate threshold value f0When, the corresponding water pump water supply start of host-initiated.
The control method of 4th kind of photovoltaic water-raising system provided by the embodiments of the present application, is in the third above-mentioned photovoltaic water-raising
Further include following technical characteristic on the basis of the control method of system:
The water pump for being enough to drive more slaves when the photovoltaic module array output power reaches minimum
When effective water supply lift, starts more slaves and set the running frequency of the host with the slave having been started up, make
The output frequency of the host and the slave having been started up is down to an equal value are as follows:
The host and the slave are the photovoltaic water pump frequency converter of parameter having the same, when the photovoltaic module battle array
Column output power increase to make N platform be currently running in total output frequency of photovoltaic water pump frequency converter meet formula:It is greater thanWhen, then continue to start a slave, and the output frequency of the host and the N platform slave being activated is down toWherein, fNFor the output frequency of photovoltaic water pump frequency converter described in the N platform in operating status.
Specifically, if currently only host is being run, as the output frequency f of the host1Meet formula f1 3Greatly
In 2f0 3When, start more slaves, and the output frequency of the host and the slave having been started up is down toWith
After illumination further enhance, the energy being capable of providing is increasing, host can successively start more slaves and
Its corresponding water pump is started to work.When the output frequency of host and slave meets formula 2f1 3At least more than 3 times f0 3, host-initiated
Another slave, and the output frequency for giving another slave isThe slave started simultaneously by host itself and at first
Frequency be reduced toIt still maintains host and does maximal power tracing, slave is given as actuator, output frequency by host
Fixed, the output frequency of three pump variable frequency devices is consistent, and according to said method successively starts other water pumps of entire water-raising system
Frequency converter.
The control method of 5th kind of photovoltaic water-raising system provided by the embodiments of the present application, is in the third above-mentioned photovoltaic water-raising
Further include following technical characteristic on the basis of the control method of system:
It is described to be decreased to be not enough to support the slave driving water pump of current quantity to reach when illumination weakens to the output power
When to minimum effective water supply lift, a slave is closed, and adjust the running frequency of the host and running slave, make institute
The output frequency for stating host and currently running slave is increased to an equal value are as follows:
The host and the slave are the photovoltaic water pump frequency converter of parameter having the same, when the photovoltaic module battle array
Column output power is decreased to make the running frequency of the corresponding water pump of photovoltaic water pump frequency converter described in N platform close to f0When, close one
Slave, and the output frequency of the host and currently running slave is increased toWherein, fNFor light described in N platform
Lie prostrate the output frequency when operation of pump variable frequency device.
When illumination continues to weaken, successively closes each slave and be then shut off the host, be then shut off entire system
System.
It should be noted that energy provided by current photovoltaic module array can support how many photovoltaic water pump frequency converter works
Make, then will how many platform photovoltaic water pump frequency converter it is in the open state, this can more fully utilize solar energy.
When using more complicated control algolithm, the rated power of host and slave can be different, by communicating slave
Report the rated power of itself to host, when host-initiated slave, the running frequency of slave and host can also be different.
Above scheme is illustrated with a specific example below, as shown in figure 3, Fig. 3 is a kind of specific light
Lie prostrate the schematic diagram of water-raising system.The program uses the photovoltaic water-raising system of 300kW, 380V, it is contemplated that the efficiency of water pump configures
350kW battery component, selects 250W battery component, open-circuit voltage 38V, MPP voltage 31V, and 18 strings 78 simultaneously form a 350kW's
Cell array, the photovoltaic water pump frequency converter of 3 sets of 100kW is followed by by confluence, and each pump variable frequency device is switched by CAN communication
Machine control and output frequency is given and fault status information reports, communication modes can also be used analog input, 422 or with
The too modes such as net.
It is assumed that the rated head of water pump is 100 meters, the height of pumping up water of the needs of client is 20 meters, then the minimum work of water pump
Frequency is 22Hz (perfect condition does not consider pipe loss).Pump variable frequency device 1 is set as host, as the sun rises, when photovoltaic function
When rate is not able to satisfy pump working frequency 22Hz, pump variable frequency device 1 in a dormant state, is restarted after setting time, until
Water pump can run to 22Hz or more, and system just really starts, and as illumination enhances, the running frequency of water pump constantly increases, when
When frequency reaches 28Hz, pump variable frequency device 2 is started by CAN communication, while the output frequency of frequency converter 1 and frequency converter 2 is same
Step is given as 22Hz, as illumination further enhances, when the output frequency of frequency converter 1 and frequency converter 2 reaches 25Hz, passes through
CAN communication starts pump variable frequency device 3, while the output frequency of frequency converter 1,2,3 being synchronized and is given as 22Hz, 3 frequency conversions since then
Device all starts.
When illumination weakens, when the output frequency of 3 frequency converters reaches lowest operating frequency 22Hz, Host Shutdown frequency converter
3, at the same by frequency converter 1 and the output frequency of frequency converter 2 synchronize be given as 25Hz, as illumination continues to weaken, when 1 He of frequency converter
When the output frequency of frequency converter 2 is reduced to 22Hz, Host Shutdown frequency converter 2, while itself output frequency is adjusted to 28Hz, until
Host output frequency is reduced to 22Hz, and system enters dormant state, when starting next frequency converter in order to prevent in practical application
Due to photovoltaic power fluctuation frequency of occurrences switching, the stagnant ring of switching can be set, that is, when starting, when
Shi Qidong N platform frequency converter, when shutdown, work as fN< 22+ Δ2When, close N platform frequency converter, Δ1And Δ2For the stagnant ring frequency of setting
Rate.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (9)
1. a kind of photovoltaic water-raising system characterized by comprising
The host and at least one slave connecting jointly with photovoltaic module array, the host and the slave are photovoltaic water pump
Frequency converter；
The host and each slave are connected to a corresponding water pump；
It is attached between the host and each slave using communication line, and the slave is controlled by the host,
The host sends start stop signal to each slave respectively by the communication line and gives the operation frequency of the slave
Rate；
The host is used to obtain the output power of the photovoltaic module array, with the output power of the photovoltaic module array
Increase, successively start the host and the slave, and set the running frequency of the host and slave, and/or, with institute
The reduction of the output power of photovoltaic module array is stated, successively stops the slave and the host, and adjust the master being currently running
The running frequency of machine and slave；
Suspend mode control unit is provided in the host, for described in the control when the host driven water pump water supply lift deficiency
Master dormant, and the host is restarted after predetermined period.
2. photovoltaic water-raising system according to claim 1, which is characterized in that be provided with frequency control list in the host
Member increases to for the output power when the photovoltaic module array and is enough to make more slaves driving water pumps to reach minimum to have
When imitating water supply lift, starts more slaves and the output frequency of the host and the slave having been started up is down to one
A equal value, and/or, when the output power of the photovoltaic module array is decreased to be not enough to support the slave of current quantity to drive
When dynamic water pump reaches minimum effective water supply lift, a slave is closed, and by the output of the host and currently running slave
Frequency is increased to an equal value.
3. -2 described in any item photovoltaic water-raising systems according to claim 1, which is characterized in that the host further includes maximum work
Rate tracking module controls the photovoltaic module array output most for carrying out maximal power tracing to the photovoltaic module array
It is high-power.
4. -2 described in any item photovoltaic water-raising systems according to claim 1, which is characterized in that the host and the slave are equal
For the identical photovoltaic water pump frequency converter of parameter.
5. a kind of control method of photovoltaic water-raising system, which is characterized in that the photovoltaic water-raising system include jointly with photovoltaic group
The host and at least one slave of part array connection, the host and the slave are photovoltaic water pump frequency converter, the slave
The host is connect and is controlled by with the main-machine communication, and the host is by the communication line respectively to each slave
It sends start stop signal and gives the running frequency of the slave, the host and each slave are connected to corresponding one
Water pump；
The control method includes:
The output power of the photovoltaic module array is obtained by the host；
With the increase of the photovoltaic module array output power, successively start the host and the slave, and described in setting
The running frequency of host and slave, and/or, with the reduction of the photovoltaic module array output power, successively stop it is described from
Machine and the host, and adjust the running frequency of the host and slave that are currently running；
When the photovoltaic module array output power is insufficient to allow the corresponding water pump of the host to reach minimum effective water supply lift
When, the host auto sleep, and the host is restarted with predetermined period.
6. the control method of photovoltaic water-raising system according to claim 5, which is characterized in that described with the photovoltaic group
The increase of part array output power successively starts the host and the slave, and sets the running frequency of the slave, and/
Or, successively stopping the slave and the host, and adjust and transporting with the reduction of the photovoltaic module array output power
The running frequency of capable host and slave includes:
When starting illumination, the photovoltaic module array output power increases, and controls the host and starts to work, the host pair
The photovoltaic module array carries out maximal power tracing, and obtains the photovoltaic module array output power by the host；
When the photovoltaic module array output power is enough, and the corresponding water pump of the host is made to reach minimum effective water supply lift,
The corresponding water pump water supply start of host-initiated；
It is enough to make the water pump of more slave drivings to reach most when the photovoltaic module array output power continues to increase to
When low effective water supply lift, starts more slaves and sets the running frequency of the host with the slave having been started up,
The output frequency for the slave for making the host and having been started up is down to an equal value；
It is decreased to be not enough to support the slave of current quantity to drive water when illumination weakens to the photovoltaic module array output power
When pump reaches minimum effective water supply lift, a slave is closed, and adjust the running frequency of the host and running slave,
The output frequency of the host and currently running slave is set to be increased to an equal value；
When illumination continues to weaken, successively closes each slave and be then shut off the host, be then shut off whole system.
7. the control method of photovoltaic water-raising system according to claim 6, which is characterized in that described to work as photovoltaic module array
Output power is enough to make when reaching minimum effective water supply lift of the corresponding water pump of the host, the corresponding water of host-initiated
Pump water supply start are as follows:
When the photovoltaic module array output power is enough that the corresponding water pump of the host is made to reach minimum effective working frequency threshold
Value f0When, the corresponding water pump water supply start of host-initiated.
8. the control method of photovoltaic water-raising system according to claim 7, which is characterized in that described to work as the photovoltaic module
When array output power is enough that the water pump of more slave drivings is made to reach minimum effective water supply lift, starting more one
Platform slave simultaneously sets the host and the running frequency of slave having been started up, make the host and the slave that has been started up it is defeated
Frequency is down to an equal value out are as follows:
The host and the slave are the photovoltaic water pump frequency converter of parameter having the same, when the photovoltaic module array is defeated
Out power increase to make N platform be currently running in total output frequency of photovoltaic water pump frequency converter meet formula:It is greater thanWhen, then continue to start a slave, and the output frequency of the host and the N platform slave being activated is down toWherein, fNFor the output frequency of photovoltaic water pump frequency converter described in the N platform in operating status.
9. the control method of photovoltaic water-raising system according to claim 7, which is characterized in that described when illumination weakens to institute
When stating output power and being decreased to be not enough to support the slave driving water pump of current quantity to reach minimum effective water supply lift, one is closed
A slave, and adjust the running frequency of the host and running slave makes the defeated of the host and currently running slave
Frequency is increased to an equal value out are as follows:
The host and the slave are the photovoltaic water pump frequency converter of parameter having the same, when the photovoltaic module array is defeated
Power is decreased to make the running frequency of the corresponding water pump of photovoltaic water pump frequency converter described in N platform close to f out0When, a slave is closed,
And the output frequency of the host and currently running slave is increased toWherein, fNFor photovoltaic water described in N platform
Output frequency when pump frequency conversion device is run.
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| DE112017000241T5 (en) * | 2017-09-13 | 2019-05-09 | China Electric Power Research Institute Company Limited | Method and device for controlling a photovoltaic power plant and storage medium |
| CN112805470B (en) * | 2018-10-26 | 2022-07-26 | 株式会社日立产机系统 | Gas compressor |
| CN112360731A (en) * | 2020-10-10 | 2021-02-12 | 深圳第三代半导体研究院 | Multi-machine parallel photovoltaic equipment control system and optimization method |
| CN113623166B (en) * | 2021-07-21 | 2022-07-05 | 深圳天源新能源股份有限公司 | Control method of multi-pump parallel photovoltaic pumping system, inverter and photovoltaic pumping system |
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