CN107276517A - A kind of photovoltaic system electric energy control method - Google Patents
A kind of photovoltaic system electric energy control method Download PDFInfo
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- CN107276517A CN107276517A CN201710420294.7A CN201710420294A CN107276517A CN 107276517 A CN107276517 A CN 107276517A CN 201710420294 A CN201710420294 A CN 201710420294A CN 107276517 A CN107276517 A CN 107276517A
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 230000005611 electricity Effects 0.000 claims abstract description 93
- 239000003990 capacitor Substances 0.000 claims abstract description 43
- 238000004891 communication Methods 0.000 claims description 21
- 230000005540 biological transmission Effects 0.000 claims description 13
- 230000005494 condensation Effects 0.000 claims description 6
- 238000009833 condensation Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 description 7
- 230000015556 catabolic process Effects 0.000 description 5
- 238000006731 degradation reaction Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000005413 snowmelt Substances 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- QVFWZNCVPCJQOP-UHFFFAOYSA-N chloralodol Chemical compound CC(O)(C)CC(C)OC(O)C(Cl)(Cl)Cl QVFWZNCVPCJQOP-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000013082 photovoltaic technology Methods 0.000 description 1
Classifications
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- 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
- H02S20/00—Supporting structures for PV modules
- H02S20/30—Supporting structures being movable or adjustable, e.g. for angle adjustment
- H02S20/32—Supporting structures being movable or adjustable, e.g. for angle adjustment specially adapted for solar tracking
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/16—Devices for removing snow or ice from lines or cables
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- 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
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- 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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Abstract
The invention provides a kind of photovoltaic system electric energy control method, applied to photovoltaic system electric energy control device, one end of the photovoltaic system electric energy control device is connected with concentration photo-thermal electricity generation system, and the photovoltaic system electric energy control device includes DC capacitor, is arranged at the other end of the photovoltaic system electric energy control device；The photovoltaic system electric energy control method includes：Judge whether the photovoltaic system electric energy control device meets default electric energy reverse flow condition；If the photovoltaic system electric energy control device meets the default electric energy reverse flow condition, the concentration photo-thermal electricity generation system is controlled to stop output electric energy；The electric energy on the DC capacitor is controlled to transmit to the concentration photo-thermal electricity generation system, the photovoltaic system electric energy control method that the present invention is provided, by the photovoltaic system electric energy control device, the concentration photo-thermal electricity generation system that control meets default electric energy reverse flow condition receives the electric energy stored on its DC capacitor.
Description
Technical field
The present invention relates to field of photovoltaic technology, and in particular to a kind of photovoltaic system electric energy control method.
Background technology
Photovoltaic system is typically made up of photovoltaic array, inverter and load (and/or power network), and photovoltaic array is by no less than 1
Block concentration photo-thermal electricity generation system connection in series-parallel is formed, and the luminous energy received is converted into direct current energy output, light is by inverter by light
The direct current energy of photovoltaic array output is converted to AC energy, is load supplying or feed-in power network.In some cases .., such as melt
Snow, deicing etc. give the heating of concentration photo-thermal electricity generation system, it is necessary to which photovoltaic system absorbs electric energy from power network.But, due to different optically focused
Parameter between solar-thermal generating system has differences, accumulated snow and icing are uneven, causes when general power is fixed, different optically focused
The power consumed on solar-thermal generating system is different, and some components may receive excessive backward power and occur performance degradation
Or damage.
The content of the invention
The present invention provides a kind of photovoltaic system electric energy control method, and reverse work(is received to solve members in the prior art
Rate is larger and occurs the problem of performance degradation or damage.
It is described applied to photovoltaic system electric energy control device the invention provides a kind of photovoltaic system electric energy control method
One end of photovoltaic system electric energy control device is connected with concentration photo-thermal electricity generation system, is wrapped in the photovoltaic system electric energy control device
Include DC capacitor, be arranged at the other end of the photovoltaic system electric energy control device；The photovoltaic system electric energy control method bag
Include：Judge whether the photovoltaic system electric energy control device meets default electric energy reverse flow condition；If the photovoltaic system electricity
Energy control device meets the default electric energy reverse flow condition, then controls the concentration photo-thermal electricity generation system to stop output electricity
Energy；The electric energy on the DC capacitor is controlled to transmit to the concentration photo-thermal electricity generation system；The concentration photo-thermal electricity generation system bag
Include concentration photo-thermal and receive tower and multiple heliostats, condensation photovoltaic reception device；Sunshine acquisition module, the acquisition module is used to obtain
Take actual sunshine value；The heliostat includes：Tracker support；Speculum, is fixedly installed on the tracker support；Sunshine
Judge module, is connected with sunshine acquisition module communication, for judging whether the actual sunshine value is more than default sunshine value；
Controller, is connected with the tracker support, and is connected with sunshine judge module communication, for being judged according to the sunshine
The judged result of module adjusts the angle of the tracker support；If the judged result of sunshine judge module is yes, the control
Device adjusts the angle of the tracker support, makes the angle of the speculum corresponding with the condensation photovoltaic reception device；If day
Judged result according to judge module is no, and the controller adjusts the angle of the tracker support, makes the angle of the speculum
It is corresponding that degree receives tower with the concentration photo-thermal.
Above-mentioned control method, wherein, the default electric energy reverse flow condition is：Voltage on the DC capacitor is big
In first threshold or less than Second Threshold；Or, the power output of the concentration photo-thermal electricity generation system is less than the 3rd threshold value, or
The output current of concentration photo-thermal electricity generation system described in person is less than the 4th threshold value.
Above-mentioned control method, wherein, the default electric energy reverse flow condition is：Electric parameter corresponding to predeterminated frequency
Amplitude is less than respective threshold, or electric parameter amplitude corresponding to the predeterminated frequency accounts for the electric parameter corresponding to predeterminated frequency section
The ratio of amplitude sum is less than respective threshold；The predeterminated frequency is：Line voltage frequency, the characteristic frequency of inverter or light
The multiple of the resonant frequency of volt system；The electric parameter is：Input voltage, input current or the input work of the DC capacitor
Rate, or the concentration photo-thermal electricity generation system output voltage, output current or power output.
Above-mentioned control method, wherein, the concentration photo-thermal electricity generation system also includes：Wind speed acquisition module, for obtaining
Actual wind speed；Wind speed judge module, is connected with wind speed acquisition module communication, for judging that the wind speed acquisition module is obtained
Actual wind speed whether be more than default air speed value；The heliostat also include angle vernier device, the angle vernier device with
The wind speed judge module communication connection, the position for adjusting tracker support according to the judged result of the wind speed judge module
Put.
Above-mentioned control method, wherein, the angle vernier device includes：Angular transducer, with the tracker support
Connection, the posture track for obtaining the tracker support；PID controller, respectively with the angular transducer and controller
Communication connection, instructs and sends to the controller for obtaining angle adjustment according to the posture track.
Above-mentioned control method, wherein, the default electric energy reverse flow condition is：Reversely transmission of electricity control is received to refer to
Order.
Above-mentioned control method, wherein, the mode for receiving reversely transmission of electricity control instruction is by wire communication, nothing
At least one of line communication, direct current power carrier communication, external key control or external switch control.
The present invention has advantages below：
1st, the photovoltaic system electric energy control method that the present invention is provided, by the photovoltaic system electric energy control device, control is full
The concentration photo-thermal electricity generation system of the default electric energy reverse flow condition of foot receives the electric energy stored on its DC capacitor, that is, passing through
Corresponding photovoltaic system electric energy control device, respectively each concentration photo-thermal electricity generation system carries out computer heating control, and then avoids existing
Have in technology due to unified heating, make members reception backward power larger and occur the problem of performance degradation or damage, really
Ensure safety and reliably control each concentration photo-thermal electricity generation system heating to carry out snow melt deicing.
Embodiment
In the following description, a large amount of concrete details are given to provide more thorough understanding of the invention.So
And, it is obvious to the skilled person that the present invention can be able to without one or more of these details
Implement.In other examples, in order to avoid obscuring with the present invention, do not enter for some technical characteristics well known in the art
Row description.
In order to thoroughly understand the present invention, detailed step and detailed structure will be proposed in following description, so as to
Explain technical scheme.Presently preferred embodiments of the present invention is described in detail as follows, but in addition to these detailed descriptions, this
Invention can also have other embodiment.
The invention provides a kind of photovoltaic system electric energy control method, the present invention provides a kind of photovoltaic system controlling electric energy side
Method, with solve in the prior art members receive backward power it is larger and occur performance degradation or damage the problem of.
The photovoltaic system electric energy control method, applied to photovoltaic system electric energy control device, photovoltaic system controlling electric energy dress
The one end put is connected with concentration photo-thermal electricity generation system, and photovoltaic system electric energy control device includes DC capacitor, is arranged at photovoltaic
The other end of system power control device；The photovoltaic system electric energy control method includes：
Judge whether photovoltaic system electric energy control device meets default electric energy reverse flow condition；
In specific practical application, the default electric energy reverse flow condition can be set according to specific environment, than
Such as, the default electric energy reverse flow condition is：Voltage on DC capacitor is more than first threshold or less than Second Threshold.Example
Such as, setting first threshold V1=60V, Second Threshold V2=10V.As the voltage Vin=70V ＞ V1 on DC capacitor, explanation
Photovoltaic system DC side now needs to carry out overvoltage protection.And as the voltage Vin=9V ＜ V2 on DC capacitor, illustrate this
When photovoltaic system be in stopped status, it is necessary to the electric energy on dc bus be consumed, so that DC bus-bar voltage is rapidly achieved peace
The occasion of full voltage requirement.
Concentration photo-thermal electricity generation system includes concentration photo-thermal and receives tower and multiple heliostats, condensation photovoltaic reception device；Sunshine
Acquisition module, the acquisition module is used to obtain actual sunshine value；The heliostat includes：Tracker support；Speculum, it is fixed
It is arranged on the tracker support；Sunshine judge module, is connected with sunshine acquisition module communication, for judging the reality
Whether border sunshine value is more than default sunshine value；Controller, is connected with the tracker support, and logical with the sunshine judge module
News connection, the angle for adjusting the tracker support according to the judged result of the sunshine judge module；If sunshine judges
The judged result of module is yes, and the controller adjusts the angle of the tracker support, makes angle and the institute of the speculum
State condensation photovoltaic reception device correspondence；If the judged result of sunshine judge module is no, the controller adjusts the tracker
The angle of support, it is corresponding that the angle and the concentration photo-thermal for making the speculum receive tower.
If the voltage that photovoltaic system electric energy control device is met on default electric energy reverse flow condition, such as DC capacitor is big
In first threshold or less than Second Threshold；
Concentration photo-thermal electricity generation system is controlled to stop output electric energy；
Electric energy on control DC capacitor is transmitted to concentration photo-thermal electricity generation system.
No matter photovoltaic system DC side needs to carry out overvoltage protection, or photovoltaic system is in stopped status, is now both needed to
Stop the positive transmission of electric energy, i.e. concentration photo-thermal electricity generation system to the electric energy transmission of inverter, and carry out reverse power transmission,
I.e. DC capacitor is transmitted to the electric energy of concentration photo-thermal electricity generation system, to consume the electric energy stored on DC capacitor, so as to reduce straight
Flow the voltage on bus.
The photovoltaic system electric energy control method that the present embodiment is provided, passes through the photovoltaic system electric energy control device, control
The concentration photo-thermal electricity generation system for meeting default electric energy reverse flow condition receives the electric energy stored on its DC capacitor, that is, logical
Corresponding photovoltaic system electric energy control device is crossed, respectively each concentration photo-thermal electricity generation system carries out computer heating control, and then avoids
In the prior art due to unified heating, make members reception backward power larger and occur the problem of performance degradation or damage,
Ensure safely and reliably to control each concentration photo-thermal electricity generation system heating to carry out snow melt deicing.
Also, pass through the setting to presetting electric energy reverse flow condition, it is possible to achieve when photovoltaic system shuts down, each light
Volt system power control device is satisfied by the default electric energy reverse flow condition so that in each photovoltaic system electric energy control device
Electric energy on DC capacitor can carry out reverse transfer, and then quickly consume dc bus instead of power consumption device of the prior art
The electric energy stored on electric capacity.
What deserves to be explained is, prior art in some cases .., for example, photovoltaic system shutdown when or triggering emergency shutdown
When (such as Rapid Shutdown), it is necessary to photovoltaic system quickly consumes the electric energy on dc bus, to reduce dc bus electricity
Pressure, the security for improving system.In order that DC bus-bar voltage decline it is very fast, prior art generally set on dc bus by
The output connection inverter of control concentration photo-thermal electricity generation system, energy consumption under switch and the power consumption device of resistance formation, normal condition
The resistance of device disconnects with dc bus；When photovoltaic system is shut down, closure switch disconnect concentration photo-thermal electricity generation system and inversion
The input connection of device, and by the resistor coupled in parallel of power consumption device on the dc bus of inverter input terminal, quickly to consume direct current
The electric energy stored on bus capacitor.But, prior art in photovoltaic system emergency shutdown, its concentration photo-thermal electricity generation system side
Voltage between any conductor is possible to more than 80V, is not only unsatisfactory for new NEC2017 requirements, there is also certain safety is hidden
Suffer from.
And the photovoltaic system electric energy control method that the present embodiment is provided, the voltage on DC capacitor is more than first threshold
When, namely concentration photo-thermal electricity generation system output overtension when, it will control electric energy reverse transfer to concentration photo-thermal generate electricity be
System, the voltage between any conductor to ensure any time concentration photo-thermal electricity generation system side will not be too high；And work as DC capacitor
On voltage be less than Second Threshold when, namely photovoltaic system shutdown when or triggering emergency shutdown when, also can be by controlling electric energy
Reverse transfer is quickly consumed on dc-link capacitance to concentration photo-thermal electricity generation system, and then instead of power consumption device of the prior art
The electric energy of storage.Therefore, the photovoltaic system electric energy control method that the present invention is provided, that is, realize when photovoltaic system shuts down or touch
Energy storage consumption during emergency shutdown is sent out, any of concentration photo-thermal electricity generation system side is led when turn avoid emergency shutdown in the prior art
The problem of overtension between body.
In specific practical application, the default electric energy reverse flow condition can also be：
Output current of the power output of concentration photo-thermal electricity generation system less than the 3rd threshold value, or concentration photo-thermal electricity generation system
Less than the 4th threshold value.Therefore, another embodiment of the present invention additionally provides another photovoltaic system electric energy control method, including：
Judge whether the power output of concentration photo-thermal electricity generation system is less than the 3rd threshold value, or concentration photo-thermal electricity generation system
Whether output current is less than the 4th threshold value；
If the power output of concentration photo-thermal electricity generation system is less than the output electricity of the 3rd threshold value, or concentration photo-thermal electricity generation system
Stream is less than the 4th threshold value, and control concentration photo-thermal electricity generation system stops output electric energy；Electric energy on control DC capacitor is transmitted to poly-
Light solar-thermal generating system.
As another embodiment, during photovoltaic system forward direction transmission electric energy, it is assumed that concentration photo-thermal electricity generation system is externally defeated
The power gone out be less than default 3rd threshold value, such as 2W, or output current be less than default 4th threshold value, such as 0.05A, then
Think that concentration photo-thermal electricity generation system does not export electric energy externally substantially, then can control photovoltaic system and carry out reverse power conveying, to disappear
The electric energy stored on consumption DC capacitor, so as to reduce the voltage on DC capacitor.
Or, default electric energy reverse flow condition can also be：Electric parameter amplitude corresponding to predeterminated frequency is less than corresponding
Threshold value, or electric parameter amplitude corresponding to predeterminated frequency account for the electric parameter amplitude sum corresponding to predeterminated frequency section ratio it is small
In respective threshold；
Predeterminated frequency is：The multiple of the resonant frequency of line voltage frequency, the characteristic frequency of inverter or photovoltaic system；
Electric parameter is：The input voltage of DC capacitor, input current either input power or concentration photo-thermal electricity generation system
Output voltage, output current or power output.
Therefore, another embodiment of the present invention additionally provides another photovoltaic system electric energy control method, including：
Judge whether the electric parameter amplitude corresponding to predeterminated frequency is less than respective threshold, or the electricity corresponding to predeterminated frequency
Whether the ratio that parameter magnitude accounts for the electric parameter amplitude sum corresponding to predeterminated frequency section is less than respective threshold；
If the parameter magnitude corresponding to predeterminated frequency is less than respective threshold, or the electric parameter amplitude corresponding to predeterminated frequency
The ratio for accounting for the electric parameter amplitude sum corresponding to predeterminated frequency section is less than respective threshold, and control concentration photo-thermal electricity generation system stops
Export electric energy；
Electric energy on control DC capacitor is transmitted to concentration photo-thermal electricity generation system.
As another embodiment, during photovoltaic system forward direction transmission electric energy, generated electricity according to the concentration photo-thermal that detection is obtained
Output voltage, electric current and the power of system, and DC capacitor input voltage, electric current and power, calculate predeterminated frequency institute it is right
Two voltage magnitudes, two current amplitudes and two power magnitudes answered, judge whether each amplitude is less than its respective threshold.Light
Volt system is when being incorporated into the power networks, and its inverter direct-flow side can induce electric parameter fluctuation corresponding with mains frequency.Therefore can be with
Set multiple of the predeterminated frequency as line voltage frequency or line voltage frequency, such as 50Hz or 50Hz multiple.Than
Such as, for single-phase photovoltaic system, the 2 frequency multiplication 100Hz or 4 frequency multiplication 200Hz of line voltage frequency be can be set as；For three-phase
Photovoltaic system, can be set as the 3 frequency multiplication 150Hz or 6 frequency multiplication 300Hz or 12 frequency multiplication 600Hz of line voltage frequency.When
When being more than or equal to respective threshold by obtaining the parameter magnitude corresponding to predeterminated frequency, you can judge photovoltaic system normal grid-connected
Operation；And when being less than respective threshold by obtaining the parameter magnitude corresponding to predeterminated frequency, you can judge photovoltaic system off-grid, this
When can control electric energy reverse transfer, to reduce photovoltaic system DC bus-bar voltage rapidly.
In addition, the converters (such as inverter) in photovoltaic system, can operationally produce some characteristic frequencies,
The switching frequency (such as 16KHz) and multiple, EMC that for example PWM copped waves are formed filter the specific frequency spike to be formed.Therefore it can set
The fixed predeterminated frequency is the characteristic frequency or its multiple of inverter, such as 16KHz.When by obtaining the ginseng corresponding to predeterminated frequency
When measuring amplitude more than or equal to respective threshold, you can judge that the inverter in photovoltaic system is normally being run；And by being preset
When parameter magnitude corresponding to frequency is less than respective threshold, you can judge that the inverter in photovoltaic system is shut down, can now control
Electric energy reverse transfer processed, to reduce photovoltaic system DC bus-bar voltage rapidly.
Furthermore, photovoltaic system is in normal operation, and its inductance L, electric capacity C and stray inductance Le, parasitic capacitance Ce etc. can be produced
Some raw resonance effects, converters operationally also can be in some Frequency points generation resonance effect sometimes.These are humorous
Relatively low impedance can be presented in the Frequency point shaken, correspondingly, and larger amplitude can be presented in these Frequency points for electric parameter.Therefore can be with
Set the resonant frequency that the predeterminated frequency is run as photovoltaic system.It is more than when by obtaining the parameter magnitude corresponding to predeterminated frequency
During equal to respective threshold, you can judge that the converters in photovoltaic system are normally being run；Obtain predeterminated frequency institute right
When the parameter magnitude answered is less than respective threshold, you can judge that photovoltaic system is not run, can now control electric energy reverse transfer,
To reduce photovoltaic system DC bus-bar voltage rapidly.
In the above-described embodiment, if the predeterminated frequency of setting is higher, sometimes because the factors such as Line Attenuation cause
Detection error is larger.It is therefore possible to use relative value judges.Set a frequency band fL~fH, the wherein predeterminated frequency
Between fL and fH.Assuming that selected electric parameter is voltage V, amplitude Vfs of the voltage V at the predeterminated frequency is calculated, is calculated simultaneously
The corresponding electric parameter amplitude sum Vf2 of frequency band fL~fH, judge Vf/Vf2 and threshold value k size, if Vf/Vf2 ＜ k, show
The voltage magnitude ratio that voltage magnitude at the predeterminated frequency accounts for frequency band is smaller, it is believed that photovoltaic system does not have grid-connected or is in
Stopped status is, it is necessary to control electric energy reverse transfer.There is same conclusion for electric current, power, no longer repeat one by one herein.
Or, default electric energy reverse flow condition is：
Receive reversely transmission of electricity control instruction.
Therefore, another embodiment of the present invention additionally provides another photovoltaic system electric energy control method, including：
Receive reversely transmission of electricity control instruction；
Concentration photo-thermal electricity generation system is controlled to stop output electric energy to inverter；
Electric energy on control DC capacitor is transmitted to concentration photo-thermal electricity generation system.
As another embodiment, the control instruction of reversely transmitting electricity may come from inverter, net in photovoltaic system
Central controller close, monitored whole photovoltaic system etc., in addition, the reverse transmission of electricity control instruction can be from external key
Control or external switch control, are not specifically limited herein, depending on its concrete application environment, the protection model in the application
In enclosing.
And the reverse transmission of electricity control instruction can by wire communications such as RS485, RS232, CAN, or WIFI,
At least a kind in the communication modes such as the radio communications such as Zigbee, Lora, direct current power carrier communication.Specific communication mode is here
It is not construed as limiting, depending on its concrete application environment, in the protection domain of the application.When inverter shutdown or off-grid,
It can give by sending the reverse transmission of electricity control instruction, control photovoltaic system carries out reverse power conveying, to consume DC capacitor
The electric energy of upper storage, so as to reduce the voltage on DC capacitor.
On the basis of above-described embodiment, it is preferred that the photovoltaic system electric energy control method also includes：
To the output current or power output of DC capacitor, or, the input current of concentration photo-thermal electricity generation system, input work
Rate or input voltage are limited, to prevent the power of concentration photo-thermal electricity generation system absorption electric energy excessive.
It is preferred that, while the electric energy on the control DC capacitor is transmitted to the concentration photo-thermal electricity generation system, also wrap
Include：The voltage on DC capacitor is controlled to be less than or equal to first threshold.In specific practical application, in order to prevent concentration photo-thermal from sending out
Electric system absorption electric energy is larger, and then influences concentration photo-thermal electricity generation system performance or life-span, the photovoltaic system electric energy control method
It can increase some restrictions when carrying out electric energy reverse transfer.
Such as, the input voltage of limitation concentration photo-thermal electricity generation system is no more than default threshold voltage, specifically can basis
The parameter of concentration photo-thermal electricity generation system carrys out set threshold voltage, for example, being for 35V concentration photo-thermal generating for open-circuit voltage
System, can be using set threshold voltage as 38V.Then the electric energy on DC capacitor is transmitted to the input voltage control of concentration photo-thermal electricity generation system
System is between 35V to 38V, you can to ensure that concentration photo-thermal electricity generation system is in the state of absorption electric energy, also ensure that concentration photo-thermal
It is not too large that electricity generation system absorbs electric energy.
Or, the input power of concentration photo-thermal electricity generation system or the power output of DC capacitor are limited no more than default
Threshold power, such as 5W, you can ensure concentration photo-thermal electricity generation system absorbed power not over 5W.
Or, the input current of limitation concentration photo-thermal electricity generation system is no more than default threshold current, such as 0.2A gathers
Light solar-thermal generating system receive input voltage in 35V, it is ensured that concentration photo-thermal electricity generation system absorbed power not over
35*0.2=7W.
Again or, limitation DC capacitor output current be no more than default threshold current, such as 0.5A, DC capacitor
Output voltage maximum takes 20V, then concentration photo-thermal electricity generation system absorbed power can be ensured not over 20*0.5=10W.
Meanwhile, the voltage directly limited on DC capacitor is no more than first threshold, such as 60V is also possible to prevent optically focused light
It is larger that heat generating system absorbs electric energy, it is to avoid influence concentration photo-thermal electricity generation system performance or life-span；The first threshold is only herein
A kind of example, can be depending on its concrete application environment, in the protection domain of the application.
Additionally, it is preferred that, the electric energy on control DC capacitor is transmitted to concentration photo-thermal electricity generation system, including：
The electric energy on the DC capacitor is controlled to be transmitted by boosting inverter to the concentration photo-thermal electricity generation system.
After the electric energy boosting on DC capacitor, then transmit to concentration photo-thermal electricity generation system, can will limit concentration photo-thermal
The input voltage of electricity generation system is successfully limited between open-circuit voltage and threshold voltage, and then ensures concentration photo-thermal electricity generation system
In the state for absorbing electric energy, also ensure that concentration photo-thermal electricity generation system absorbs electric energy not too large.
Presently preferred embodiments of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, wherein the equipment and structure be not described in detail to the greatest extent are construed as giving reality with the common mode in this area
Apply；Any those skilled in the art, without departing from the scope of the technical proposal of the invention, all using the disclosure above
Methods and techniques content make many possible variations and modification to technical solution of the present invention, or be revised as equivalent variations etc.
Embodiment is imitated, this has no effect on the substantive content of the present invention.Therefore, every content without departing from technical solution of the present invention, foundation
The technical spirit of the present invention still falls within the present invention to any simple modifications, equivalents, and modifications made for any of the above embodiments
In the range of technical scheme protection.
Claims (7)
1. a kind of photovoltaic system electric energy control method, it is characterised in that applied to photovoltaic system electric energy control device, the photovoltaic
One end of system power control device is connected with concentration photo-thermal electricity generation system, and the photovoltaic system electric energy control device includes directly
Stream electric capacity, the other end for being arranged at the photovoltaic system electric energy control device；The photovoltaic system electric energy control method includes：Sentence
Whether the photovoltaic system electric energy control device that breaks meets default electric energy reverse flow condition；If the photovoltaic system controlling electric energy
Device meets the default electric energy reverse flow condition, then controls the concentration photo-thermal electricity generation system to stop output electric energy；Control
Electric energy on the DC capacitor is transmitted to the concentration photo-thermal electricity generation system；The concentration photo-thermal electricity generation system includes optically focused light
Heat receives tower and multiple heliostats, condensation photovoltaic reception device；Sunshine acquisition module, the acquisition module is used to obtain actual day
According to value；The heliostat includes：Tracker support；Speculum, is fixedly installed on the tracker support；Sunshine judges mould
Block, is connected with sunshine acquisition module communication, for judging whether the actual sunshine value is more than default sunshine value；Control
Device, is connected with the tracker support, and is connected with sunshine judge module communication, for according to the sunshine judge module
Judged result adjust the angle of the tracker support；If the judged result of sunshine judge module is yes, the controller is adjusted
The angle of the whole tracker support, makes the angle of the speculum corresponding with the condensation photovoltaic reception device；If sunshine is sentenced
The judged result of disconnected module be no, and the controller adjusts the angle of the tracker support, make the speculum angle and
The concentration photo-thermal receives tower correspondence.
2. a kind of photovoltaic system electric energy control method according to claim 1, it is characterised in that the default electric energy is reverse
Flox condition is：Voltage on the DC capacitor is more than first threshold or less than Second Threshold；Or, the concentration photo-thermal
The power output of electricity generation system is less than the 3rd threshold value, or the output current of the concentration photo-thermal electricity generation system is less than the 4th threshold
Value.
3. a kind of photovoltaic system electric energy control method according to claim 2, it is characterised in that the default electric energy is reverse
Flox condition is：Electric parameter amplitude corresponding to predeterminated frequency is less than respective threshold, or the electricity corresponding to the predeterminated frequency
The ratio that parameter magnitude accounts for the electric parameter amplitude sum corresponding to predeterminated frequency section is less than respective threshold；The predeterminated frequency is：
The multiple of the resonant frequency of line voltage frequency, the characteristic frequency of inverter or photovoltaic system；The electric parameter is：It is described straight
Flow input voltage, the input current either output voltage of input power or the concentration photo-thermal electricity generation system, the output of electric capacity
Electric current or power output.
4. a kind of photovoltaic system electric energy control method according to claim 3, it is characterised in that the concentration photo-thermal generates electricity
System also includes：Wind speed acquisition module, for obtaining actual wind speed；Wind speed judge module, is communicated with the wind speed acquisition module
Connection, for judging whether the actual wind speed that the wind speed acquisition module is obtained is more than default air speed value；The heliostat is also wrapped
Angle vernier device is included, the angle vernier device is connected with wind speed judge module communication, for sentencing according to the wind speed
The judged result of disconnected module adjusts the position of tracker support.
5. a kind of photovoltaic system electric energy control method according to claim 4, it is characterised in that the angle vernier device
Including：Angular transducer, is connected with the tracker support, the posture track for obtaining the tracker support；PID control
Device, is connected with the angular transducer and controller communication respectively, for obtaining angle adjustment instruction according to the posture track
And send to the controller.
6. a kind of photovoltaic system electric energy control method according to claim 5, it is characterised in that the default electric energy is reverse
Flox condition is：Receive reversely transmission of electricity control instruction.
7. a kind of photovoltaic system electric energy control method according to claim 6, it is characterised in that it is described receive it is reversely defeated
The mode of electric control instruction is to be opened by wire communication, radio communication, direct current power carrier communication, external key control or outside
Close at least one of control.
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| CN201710420294.7A CN107276517A (en) | 2017-06-06 | 2017-06-06 | A kind of photovoltaic system electric energy control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019120208A1 (en) * | 2017-12-20 | 2019-06-27 | 华为技术有限公司 | Degradation recovery method and apparatus for photovoltaic module in photovoltaic power station |
| CN110609575A (en) * | 2019-09-24 | 2019-12-24 | 浙江中光新能源科技有限公司 | Heliostat system for combining heliostat and photovoltaic panel of tower type photo-thermal power generation |
-
2017
- 2017-06-06 CN CN201710420294.7A patent/CN107276517A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019120208A1 (en) * | 2017-12-20 | 2019-06-27 | 华为技术有限公司 | Degradation recovery method and apparatus for photovoltaic module in photovoltaic power station |
| EP3716472A4 (en) * | 2017-12-20 | 2020-09-30 | Huawei Technologies Co., Ltd. | Degradation recovery method and apparatus for photovoltaic module in photovoltaic power station |
| US11329600B2 (en) | 2017-12-20 | 2022-05-10 | Huawei Digital Power Technologies Co., Ltd. | Method and apparatus for rectifying degradation of photovoltaic module in photovoltaic power station |
| US11632075B2 (en) | 2017-12-20 | 2023-04-18 | Huawei Digital Power Technologies Co., Ltd. | Method and apparatus for rectifying degradation of photovoltaic module in photovoltaic power system |
| CN110609575A (en) * | 2019-09-24 | 2019-12-24 | 浙江中光新能源科技有限公司 | Heliostat system for combining heliostat and photovoltaic panel of tower type photo-thermal power generation |
| CN110609575B (en) * | 2019-09-24 | 2022-06-14 | 浙江中光新能源科技有限公司 | Heliostat system for combining heliostat and photovoltaic panel of tower-type photo-thermal power generation |
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