CN107887901A - A kind of supplying power for photovoltaic cell system, MPPT control method and device - Google Patents
A kind of supplying power for photovoltaic cell system, MPPT control method and device Download PDFInfo
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- CN107887901A CN107887901A CN201610872039.1A CN201610872039A CN107887901A CN 107887901 A CN107887901 A CN 107887901A CN 201610872039 A CN201610872039 A CN 201610872039A CN 107887901 A CN107887901 A CN 107887901A
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- 238000012545 processing Methods 0.000 description 9
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/12—Parallel operation of dc generators with converters, e.g. with mercury-arc rectifier
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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
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention discloses a kind of supplying power for photovoltaic cell system, MPPT control method and device, it may include photovoltaic battery module, main control module and at least one auxiliary control module.Compared to prior art, the supplying power for photovoltaic cell system only includes a photovoltaic battery module, so that the main control module and at least one auxiliary control module are parallel with one another in input stage, it ensure that the input of the main control module and at least one auxiliary control module is identical, it thus also ensure that the uniformity of the output of the main control module and at least one auxiliary control module, so as to not only reduce the quantity of photovoltaic battery module, also improve the power supplying efficiency of supplying power for photovoltaic cell system and export the utilization rate of energy.
Description
Technical field
The present invention relates to technical field of solar, more particularly to a kind of supplying power for photovoltaic cell system, MPPT control method and
Device.
Background technology
With the development of heliotechnics, requirement of the various electronic equipments to supplying power for photovoltaic cell system becomes increasingly
Height, but MPPT (MPPT maximum power point tracking, the Maximum Power Point in most of supplying power for photovoltaic cell systems at present
Tracking) control module is all that unit works, and its power exported and electric current are often limited, can not meet reality
Demand.In order to lift the power and electric current of the output of MPPT control modules, in the industry often by multiple MPPT control modules in output stage
Parallel connection, the power output and output current of whole MPPT control modules are further improved, for example, as shown in figure 1, multiple light
Volt battery module connects one to one with multiple MPPT control modules, and the output end of multiple MPPT control modules is parallel with one another.
But under this mode, due to the dispersiveness of each MPPT control modules parameter, the power that they are exported is impossible
Completely the same, this this may result in some MPPT control modules can be because overload enters PV (power voltage) curves left side
Point, cause quickly to fall, and then the shutdown of these MPPT control modules or the concussion of whole electric power system are can also result in,
So that the power supplying efficiency of whole photovoltaic power supply system is relatively low, relatively low to the utilization rate of solar energy.
That is, existing supplying power for photovoltaic cell system is present, the photovoltaic battery module quantity needed is more, each MPPT
The utilization rate of output uneven, supplying power for photovoltaic cell system the power supplying efficiency and output energy of control module is relatively low to ask
Topic.
The content of the invention
The embodiments of the invention provide a kind of supplying power for photovoltaic cell system, to solve existing supplying power for photovoltaic cell system
Output in the presence of more, each MPPT control modules of photovoltaic battery module quantity of needs is uneven, supplying power for photovoltaic cell system
The problem of utilization rate of power supplying efficiency and output energy is relatively low.
The embodiments of the invention provide a kind of supplying power for photovoltaic cell system, including photovoltaic battery module, main control module with
And at least one auxiliary control module, wherein：
The photovoltaic battery module, for being supplied to the main control module and at least one auxiliary control module
Electricity；
The main control module, for determining the maximum power point of the supplying power for photovoltaic cell system, and, according to described
Maximum power point, control signal is sent at least one auxiliary control module；
Each auxiliary control module at least one auxiliary control module, for according to the control letter received
Number, adjust the output characteristics of itself.
The embodiments of the invention provide a kind of MPPT control method, including：
After photovoltaic cell is powered to main control module and at least one auxiliary control module, determine that the photovoltaic cell supplies
The maximum power point of electric system；
According to the maximum power point, control signal is sent at least one auxiliary control module, with by it is described at least
One auxiliary control module adjusts the output characteristics of itself based on the control signal.
Correspondingly, the embodiment of the present invention additionally provides a kind of MPPT control devices, including：
Determining unit, in photovoltaic cell to after main control module and the power supply of at least one auxiliary control module, it is determined that
The maximum power point of the supplying power for photovoltaic cell system；
Control unit, for according to the maximum power point, control signal to be sent at least one auxiliary control module,
To adjust the output characteristics of itself based on the control signal by least one auxiliary control module.
The present invention has the beneficial effect that：
The embodiments of the invention provide a kind of supplying power for photovoltaic cell system, MPPT control method and device, it may include photovoltaic
Battery module, main control module and at least one auxiliary control module, wherein：The photovoltaic battery module, available for described
Main control module and at least one auxiliary control module are powered；The main control module, available for determining the light
The maximum power point of battery power supply system is lied prostrate, and, according to the maximum power point, sent out at least one auxiliary control module
Send control signal；Each auxiliary control module at least one auxiliary control module, available for according to the control received
Signal processed, adjust the output characteristics of itself.Compared to prior art, the supplying power for photovoltaic cell system only includes a photovoltaic electric
Pond module so that the main control module and at least one auxiliary control module are parallel with one another in input stage, are ensured
The input of the main control module and at least one auxiliary control module is identical, thus also ensure that the master control molding
The uniformity of the output of block and at least one auxiliary control module, so as to not only reduce the quantity of photovoltaic battery module,
Also improve the power supplying efficiency of supplying power for photovoltaic cell system and export the utilization rate of energy.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, make required in being described below to embodiment
Accompanying drawing is briefly introduced, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for this
For the those of ordinary skill in field, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 show the internal structure schematic diagram of supplying power for photovoltaic cell system of the prior art；
Fig. 2 show the structural representation of the supplying power for photovoltaic cell system provided in the embodiment of the present invention one；
Fig. 3 show the internal structure schematic diagram of the supplying power for photovoltaic cell system provided in the embodiment of the present invention one；
Fig. 4 show the schematic flow sheet to expose thoroughly provided in the embodiment of the present invention one；
Fig. 5 show the schematic flow sheet of the MPPT control method provided in the embodiment of the present invention two；
Fig. 6 show the structural representation of the MPPT control devices provided in the embodiment of the present invention three.
Embodiment
In order that the object, technical solutions and advantages of the present invention are clearer, the present invention is made below in conjunction with accompanying drawing into
One step it is described in detail, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole implementation
Example.Based on the embodiment in the present invention, what those of ordinary skill in the art were obtained under the premise of creative work is not made
All other embodiment, belongs to the scope of protection of the invention.
Embodiment one：
In order to which the photovoltaic battery module quantity for solving to need present in existing supplying power for photovoltaic cell system is more, each MPPT
The utilization rate of output uneven, supplying power for photovoltaic cell system the power supplying efficiency and output energy of control module is relatively low to ask
Inscribe, a kind of supplying power for photovoltaic cell system is provided in the embodiment of the present invention one, as shown in Fig. 2 it is in the embodiment of the present invention one
The structural representation of described supplying power for photovoltaic cell system.Specifically, as shown in Fig. 2 light described in the embodiment of the present invention one
Volt battery power supply system may include：Including photovoltaic battery module 21, main control module 22 and at least one auxiliary control module 23
(Fig. 2 is by taking 2 auxiliary control modules as an example), wherein：
The photovoltaic battery module 21, enter available for the main control module and at least one auxiliary control module
Row power supply；
The main control module 22, available for the maximum power point for determining the supplying power for photovoltaic cell system, and, according to
The maximum power point, control signal is sent at least one auxiliary control module；
Each auxiliary control module 23 at least one auxiliary control module, available for according to the control received
Signal, adjust the output characteristics of itself.
That is, in embodiments of the present invention, the supplying power for photovoltaic cell system only includes a photovoltaic battery module,
So as to may be such that the main control module and at least one auxiliary control module in input stage are parallel with one another, ensure that
The input of the main control module and at least one auxiliary control module is identical, thus also ensure that the main control module
And the uniformity of the output of at least one auxiliary control module, so as to not only reduce the quantity of photovoltaic battery module, also
Improve the power supplying efficiency of supplying power for photovoltaic cell system and export the utilization rate of energy.
Controlled it should be noted that the main control module and auxiliary control module described in the embodiment of the present invention can be MPPT
Molding block, and, it is generally the case that it may include a main MPPT control module and multiple auxiliary in a supplying power for photovoltaic cell system
(specific number can flexibly be set MPPT control modules according to actual conditions, as can be according in the supplying power for photovoltaic cell system
The real output of photovoltaic battery module is set).
As shown in figure 3, it is the structural representation of the supplying power for photovoltaic cell system described in the embodiment of the present invention one, by scheming
3 understand that the supplying power for photovoltaic cell system can only include a photovoltaic battery module, with to described master hosts module (such as Fig. 3
In shown MPPT control modules 1) and at least one (N-1 as shown in Figure 3) auxiliary control module (such as institute in Fig. 3
MPPT 2~MPPT of the control module control module N shown)；And the main control module and each auxiliary control module in input stage
And output stage is mutually in parallel, also it is connected between the main control module and each auxiliary control module by communication bus, is made
The communication bus can be based on to each auxiliary control module transmission control signal by obtaining main control module, and this is not repeated.
Further, the photovoltaic battery module described in the embodiment of the present invention generally may include the group of one or more photovoltaic cells
Close, the number for the control module (main control module and at least one auxiliary control module) being connected with the photovoltaic battery module
Amount can determine according to the output of reality, for example, it is assumed that the photovoltaic battery module in the supplying power for photovoltaic cell system may include 3
Power output is 100W photovoltaic cell, and the main MPPT control modules that are used in the supplying power for photovoltaic cell system and auxiliary
The rated output power of MPPT control modules can be 150W, then using the supplying power for photovoltaic cell system shown in Fig. 3 to solar energy
, can be only when battery and each MPPT control modules (i.e. described main MPPT control modules and the auxiliary control modules of each MPPT) are powered
The main MPPT control modules for being 150W with 1 rated power and the i.e. traceable glazing volt battery of 1 auxiliary MPPT control module supply
The maximum power point of electric system.Certainly, it is necessary to illustrate, in order to realize the backup to a certain MPPT control modules, in order to avoid should
MPPT control modules, which are damaged or broken down, influences the utilization rate that whole photovoltaic cell produces energy, can also be controlled in the main MPPT
One MPPT control module of the both ends of molding block or auxiliary MPPT control blocks parallel connection, to cause in the main MPPT controls mould
When block is damaged or broken down, the main MPPT control modules are replaced, or to damage in the auxiliary MPPT control modules
Or when breaking down, the auxiliary MPPT control modules are replaced, this is not repeated.
In another example, it is assumed that the photovoltaic battery module in the supplying power for photovoltaic cell system may include that 4 power outputs are
200W photovoltaic cell, and the main MPPT control modules used in the supplying power for photovoltaic cell system and auxiliary MPPT control modules
Rated output power can be 100W, then using the supplying power for photovoltaic cell system shown in Fig. 3 to solar cell and each MPPT
When control module is powered, the main MPPT control modules and 7 rated power that can be 100W with 1 rated power be 100W
Auxiliary MPPT control modules track the maximum power point of the supplying power for photovoltaic cell system, that is to say, that discounting for MPPT
The backup of control module, then need to can be achieved to the supplying power for photovoltaic cell system with 8 100W in parallel MPPT control modules
The tracking of the maximum power point of system.Certainly, similarly, also can be in 8 MPPT if it is considered that the backup of MPPT control modules
Both ends parallel connection at least one of control module (needs to back up several MPPT control modules just several MPPT control modules in parallel) MPPT
Control module uses as backup, so that in the case where MPPT control module numbers meet backup requirements, when any of which one
Or when multiple MPPT control modules damages or failure, others backup MPPT control modules are also alternatively damaged or failure
Control module, and then ensure that the power of whole supplying power for photovoltaic cell system, it is defeated to improve whole supplying power for photovoltaic cell system
Go out the utilization rate of energy.
Specifically, the main control module 22, it is particularly used in and determines the supplying power for photovoltaic cell system in the following manner
The maximum power point of system：
Determine the peak power output of the main control module；
It is determined that the output current corresponding with the peak power output of the main control module, and it is true based on the output current
The maximum power point of the fixed supplying power for photovoltaic cell system.
, wherein it is desired to explanation, the output current corresponding with the peak power output of the main control module 22 is root
Determined according to PV (power vs. voltage) curve, this is not repeated.
For example, it is assumed that the peak power output of the main control module 22 is 100W, and with the main control module 22 most
The big corresponding output current of power output is 1A, then can be determined according to the output current corresponding with the output current
Current-limiting points (i.e. percentage of the output current in maximum output current, if output current is 1A, maximum output current 10A, then
0.1) current-limiting points can be.It is determined that after current-limiting points, the main control module can carry the current-limiting points to be believed in control
Each auxiliary control module is sent in number so that each auxiliary control module can be adjusted based on the control signal and itself be operated in the limit
Under flow point, such as the current control of itself is not repeated this at 0.1 times of maximum output current.
Certainly, can also be further true it is determined that after the peak power output of the main control module 22, it is necessary to explanation
The output voltage of the fixed main control module, and can determine that voltage-regulation amount (is designated as Δ, i.e. output voltage according to the output voltage
Difference between maximum voltage), and voltage-regulation amount Δ carrying can be sent in the control information number each auxiliary
Control module, to cause each auxiliary control module can be adjusted based on the control signal itself to be operated in the voltage-regulation amount Δ
Under, such as the output voltage control of itself is not repeated this in 20V.
Further specifically, the main control module, it is particularly used in and determines the main control module in the following manner
Peak power output：
Determine the power central point of the main control module；
Left magnitude of voltage and right magnitude of voltage are determined respectively in output voltage corresponding to the power central point or so, and really
The fixed left magnitude of voltage and the corresponding left power points of the right magnitude of voltage difference and right power points；
If it is determined that the power central point be more than the left power points and the right power points and with the power center
Difference between the corresponding output current of point and the output current of at least one auxiliary control module is not more than given threshold,
The then peak power output using the power central point as the main control module；
If it is determined that the power central point no more than the left power points and the right power points or with the power
Difference between the output current of the corresponding output current of central point and at least one auxiliary control module is more than setting threshold
Value, then using one maximum in the left power points and the right power points as the power central point, and continue executing with
The operation of the left magnitude of voltage and the right magnitude of voltage is determined, until determining that the power central point is more than the left power points
And the right power points.
, wherein it is desired to explanation, the left magnitude of voltage refers to be less than the output voltage corresponding to the power central point
Magnitude of voltage, the right magnitude of voltage refers to the magnitude of voltage for being more than the output voltage corresponding to the power central point, and usual feelings
Under condition, output voltage and the right magnitude of voltage corresponding to the left magnitude of voltage, the power central point can be arithmetic progression,
The tolerance of the arithmetic progression can be that the magnitude of voltage stepping of setting (specifically can flexibly set according to actual conditions, certainly, also may be used
Calculated and determined according to certain algorithm) determine, this is not repeated.
For example, it is assumed that the power central point of the main control module can be 1000W, then can be by described in the determination of following flows
The peak power output of main control module：
The first step：It is determined that the output voltage corresponding to the power central point；
For example, it is assumed that the power central point is 1000W, then can be right according to the power central point institute that PV curves determine
The output voltage answered, such as can be 50V；
Second step：Left magnitude of voltage and right voltage are determined respectively in output voltage corresponding to the power central point or so
Value；
For example, still by taking above-mentioned example as an example, it is assumed that the power output is 50V, and the lookup step of the output voltage set
Enter for 10V, then can determine that the left magnitude of voltage can be 40V, and the right magnitude of voltage can be 60V,.
3rd step：Determine left power points and right power points；
For example, still by taking above-mentioned example as an example, it is assumed that the power output corresponding with the left magnitude of voltage can be 900W, with institute
It can be 750W to state the corresponding power output of right magnitude of voltage, then can determine that the left power points and the right power points respectively can
For 900W and 750W, this is not repeated；
4th step：Compare the size of power central point and the left power points and the right power points；
For example, still exemplified by example above, because the power central point is 1000W, the left power points is 900W, described
Right power points is 750W, then can determine that the power central point is more than the left power points and the right power points；
In another example, it is assumed that the left power points can be 1200W, and the right power points can be 900W, then can determine that the left side
Power points is more than the power central point and the right power points, and this is not repeated.
5th step：Repeat the step of above-mentioned second step~the 4th, until the power central point determined be more than left power points and
Right power points, this is not repeated.
Specifically, the main control module, it is particularly used in the power for determining the main control module in the following manner
Central point：
According to the voltage steps of setting, multiple outputs of the main control module are scanned successively (from low to high) from high to low
Voltage, and determine the multiple power outputs corresponding with the multiple output voltage；
Power central point using a power output maximum in the multiple power output as the main control module.
For example, it is assumed that the maximum output voltage of the main control module is 100V, minimum output voltage 10V, then can lead to
Cross the power central point that following steps determine the main power control module：
The first step：It is determined that the voltage steps of setting；
, wherein it is desired to which explanation, the voltage steps can flexibly be set according to actual conditions, 10V is such as may be configured as,
The embodiment of the present invention is not limited in any way to this.
Second step：Determine multiple output voltages of the main control module under the voltage steps；
For example, it is assumed that the voltage steps can be 10V, then multiple output voltages of the main control module can be respectively
10V, 20V, 30V, 40V, 50V, 60V, 70V, 80V, 90V and 100V, this is not repeated.
3rd step：It is determined that the multiple power outputs corresponding with the multiple output voltage；
For example, still by taking above-mentioned example as an example, it is assumed that the output corresponding with multiple output voltages of the main control module
Electric current can be respectively 30A, 20A, 18A, 15A, 24A, 12A, 50A, 9A, 8A and 5A, then can determine that and the multiple output electricity
Press corresponding multiple power outputs can be 300W, 400W, 540W, 600W, 1200W, 720W, 3500W, 720W, 720W and
500W；
4th step：Power using a power output maximum in the multiple power output as the main control module
Central point.
For example, still by taking above-mentioned example as an example, then the power central point that can determine that the main control module can be 3500W, right
This is not repeated.
As shown in the above, the voltage steps are bigger, it is determined that the power central point position it is more accurate, it is described
Voltage steps are smaller, and it is faster to find the speed of the power central point, thus, in actual use, can be according to the demand of reality
Corresponding voltage steps are set, this is not repeated.
It should be noted that when the voltage steps are sufficiently small, in the power that directly can also determine first time
Peak power output of the heart point as the main control module, is not repeated this.
Further, in the voltage steps according to setting, the multiple defeated of the main control module is scanned successively from high to low
Go out before voltage, the main control module, it may also be used for：
Determine that the gross output of the main control module and at least one auxiliary control module is not less than the light
Lie prostrate the peak power output of battery module.
That is, in the voltage steps according to setting, the multiple defeated of the main control module is scanned successively from high to low
Go out before voltage, can also determine whether the main control module is in MPPT patterns, if so, then can perform above-mentioned sweep
The step of retouching, if it is not, being then believed that the main control module is in DCDC (DC-to-dc) pattern, can further it be lifted corresponding
Current-limiting points so that the main control module is operated in MPPT patterns.
It should be noted that the MPPT patterns refer to that the result of calculation of the input voltage ring of the main control module is less than
The result of calculation of the main control module output current loop, then it is believed that the input energy of the main control module under this state
The energy that exports is needed, it is necessary to carry out MPPT tracking processing less than the main control module；
The DCDC patterns refer to that the result of calculation of the input voltage ring of the main control module is not less than the main control
The result of calculation of the output current loop of module, the then it is believed that input energy of the main control module is not less than under this state
The main control module needs the energy exported, it is not necessary to carries out MPPT tracking processing.
For example, it is assumed that the peak power that the photovoltaic battery module can export is 2000W, the main control module and
Total peak power that the auxiliary control module can export is 3000W, then can determine that the main control module is in
MPPT patterns；
For another example the peak power assumed the photovoltaic battery module and can exported is 2000W, the main control module with
And that the total peak power that can export of the auxiliary control module is 1500W, then can determine that the main control module is just located
In DCDC patterns, this is not repeated.
As shown in the above, in embodiments of the present invention, control algolithm used by the supplying power for photovoltaic cell system
Can be major-minor pattern, i.e. main control module is responsible for MPPT scan tracings, is responsible for the control in the main control module from control module
The lower current limliting work of system (it should be noted that or pressure limiting work, be not construed as limiting to this)., wherein it is desired to explanation, described
It can generally be connected between main control module and each auxiliary control module using communication link, it is thus possible to realize and photovoltaic cell is supplied
The tracking of the maximum power point of electric system, improve the power supplying efficiency of the supplying power for photovoltaic cell system and export the profit of energy
With rate.
Further, it should be noted that in embodiments of the present invention, the scan method that the main control module uses still can be for
Existing interference increment scanning method, is not repeated this.
Further, it is generally the case that the supplying power for photovoltaic cell system, first can be according to setting after normal connection
Rule enter the distribution of row address to each control module in the supplying power for photovoltaic cell system, it is however generally that, can be by address number
Minimum control module (such as 0# control modules) is used as main control module, once the main control module is due to damage or event
Barrier has exited the supplying power for photovoltaic cell system, and the supplying power for photovoltaic cell system can be determined whether new control module first
The supplying power for photovoltaic cell system is added, if so, then can determine that whether the address number of the new control module is minimum, if so,
Then can be directly using the new control module as new main control module；, can will if being added without new control module
The control module of address number second small (such as 1# control modules) is not repeated this as new main control module.
Certainly, also can be using any one control module as main control module, the embodiment of the present invention pair, it is necessary to illustrate
This is not limited in any way.
Below, by taking the step flow chart described in Fig. 4 as an example, to the maximum of the main control module described in the embodiment of the present invention
The determination of power output is specifically introduced：
As shown in Figure 4, after the supplying power for photovoltaic cell system starts, the main control module can be by following
Step realizes the determination of peak power output：
The first step：A minimum current-limiting points are sent to each auxiliary control module, to judge that now the main control module is
It is no to be operated under MPPT patterns；
Certainly, it is necessary to which explanation, can not also go to judge whether the main control module is operated in MPPT patterns, to this not
Repeat.
Second step：If it is not, then increase the current-limiting points, until the main control module is operated in MPPT patterns；
3rd step：If so, then according to the voltage steps of setting, from high to low (or from low to high) master is scanned successively
Multiple output voltages of control module, and the multiple power outputs corresponding with the multiple output voltage are determined, and by described in
Power central point of the maximum power output as the main control module in multiple power outputs；
4th step：Left magnitude of voltage and right voltage are determined respectively in output voltage corresponding to the power central point or so
Value, and determine the left magnitude of voltage and the right magnitude of voltage corresponding left power points and right power points respectively；
5th step：Judge whether the power central point is more than the left power points and the right power points, if so, then
Peak power output using the power central point as the main control module；If it is not, then by the left power points and institute
The conduct power central point maximum in right power points is stated, and continues executing with the step of above-mentioned 4th step~the 5th, until really
The fixed power central point is more than the left power points and the right power points.
In addition, it is necessary to explanation, in embodiments of the present invention, except main control module can carry out MPPT maximum power point tracking
Outside processing, other each auxiliary control modules can also carry out MPPT maximum power point tracking processing, and this is not repeated.
It should be noted that in embodiments of the present invention, for the supplying power for photovoltaic cell system containing two-step evolution circuit
For, such as possess boost primes and the supplying power for photovoltaic cell system of DCDC suffix, except the controllable control DCDC suffix
Part, make outside it is operated under MPPT patterns, also to can control the boost primes part, make it be operated under MPPT patterns,
The embodiment of the present invention is not limited in any way to this.
The embodiment of the present invention one provides a kind of supplying power for photovoltaic cell system, it may include photovoltaic battery module, master control molding
Block and at least one auxiliary control module, wherein：The photovoltaic battery module, available for the main control module and described
At least one auxiliary control module is powered；The main control module, available for determining the supplying power for photovoltaic cell system most
It is high-power, and, according to the maximum power point, control signal is sent at least one auxiliary control module；It is described extremely
Each auxiliary control module in a few auxiliary control module, available for according to the control signal received, adjust itself
Output characteristics.Compared to prior art, the supplying power for photovoltaic cell system only includes a photovoltaic battery module so that the master
Control module and at least one auxiliary control module are parallel with one another in input stage, ensure that the main control module with
And the input of at least one auxiliary control module is identical, thus it also ensure that the main control module and described at least one
The uniformity of the output of auxiliary control module, so as to not only reduce the quantity of photovoltaic battery module, also improve photovoltaic cell confession
The power supplying efficiency of electric system and the utilization rate for exporting energy.
Embodiment two：
It is defeated for more, each MPPT control modules of the photovoltaic battery module quantity for solving to need in the presence of prior art
Go out uneven, supplying power for photovoltaic cell system power supplying efficiency and export energy utilization rate it is relatively low the problem of, the present invention is real
Apply example two and provide a kind of MPPT control method, as shown in figure 5, it is the MPPT control method described in the embodiment of the present invention two
Schematic flow sheet.Specifically, as shown in Figure 5, the MPPT control method may include following steps：
Step 501：After photovoltaic cell is powered to main control module and at least one auxiliary control module, the light is determined
Lie prostrate the maximum power point of battery power supply system；
Step 502：According to the maximum power point, control signal is sent at least one auxiliary control module, with by
At least one auxiliary control module adjusts the output characteristics of itself based on the control signal.
That is, after photovoltaic cell is powered to main control module and at least one auxiliary control module, it may be determined that institute
State the maximum power point of supplying power for photovoltaic cell system；And can be according to the maximum power point, at least one auxiliary control molding
Block sends control signal, to adjust the output characteristics of itself based on the control signal by least one auxiliary control module.
Compared to prior art, the supplying power for photovoltaic cell system only includes a photovoltaic battery module so that the main control module
And at least one auxiliary control module is parallel with one another in input stage, ensure that the main control module and it is described extremely
The input of a few auxiliary control module is identical, thus also ensure that the main control module and at least one auxiliary control molding
The uniformity of the output of block, so as to not only reduce the quantity of photovoltaic battery module, also improve supplying power for photovoltaic cell system
Power supplying efficiency and the utilization rate for exporting energy.
Specifically, it is determined that the maximum power point of the supplying power for photovoltaic cell system, it may include：
Determine the peak power output of the main control module；
It is determined that the output current corresponding with the peak power output of the main control module, and it is true based on the output current
The maximum power point of the fixed supplying power for photovoltaic cell system.
Further specifically, it is determined that the peak power output of the main control module, it may include：
Determine the power central point of the main control module；
Left magnitude of voltage and right magnitude of voltage are determined respectively in output voltage corresponding to the power central point or so, and really
The fixed left magnitude of voltage and the corresponding left power points of the right magnitude of voltage difference and right power points；
If it is determined that the power central point be more than the left power points and the right power points and with the power center
Difference between the corresponding output current of point and the output current of at least one auxiliary control module is not more than given threshold,
The then peak power output using the power central point as the main control module；
If it is determined that the power central point no more than the left power points and the right power points or with the power
Difference between the output current of the corresponding output current of central point and at least one auxiliary control module is more than setting threshold
Value, then using one maximum in the left power points and the right power points as the power central point, and continue executing with
The operation of the left magnitude of voltage and the right magnitude of voltage is determined, until determining that the power central point is more than the left power points
And the right power points.
Specifically, it is determined that the power central point of the main control module, it may include：
According to the voltage steps of setting, multiple output voltages of the main control module are scanned successively from high to low, and really
The fixed multiple power outputs corresponding with the multiple output voltage；
Power central point using a power output maximum in the multiple power output as the main control module.
Further, in the voltage steps according to setting, the multiple defeated of the main control module is scanned successively from high to low
Go out before voltage, the MPPT control method may also include：
Determine that the gross output of the main control module and at least one auxiliary control module is not less than the light
Lie prostrate the peak power output of battery module.
The embodiment of the present invention two provides a kind of MPPT control method, in photovoltaic cell to main control module and at least one
After individual auxiliary control module power supply, it may be determined that the maximum power point of the supplying power for photovoltaic cell system；And can be according to the maximum work
Rate point, control signal is sent at least one auxiliary control module, it is described to be based on by least one auxiliary control module
Control signal adjusts the output characteristics of itself.Compared to prior art, the supplying power for photovoltaic cell system only includes a photovoltaic
Battery module so that the main control module and at least one auxiliary control module are parallel with one another in input stage, are protected
It is identical to have demonstrate,proved the input of the main control module and at least one auxiliary control module, thus also ensure that the main control
The uniformity of the output of module and at least one auxiliary control module, so as to not only reduce the number of photovoltaic battery module
Amount, also improve the power supplying efficiency of supplying power for photovoltaic cell system and export the utilization rate of energy.
Embodiment three：
Based on providing a kind of MPPT control dress with the identical inventive concept of the embodiment of the present invention two, the embodiment of the present invention three
Put, as shown in fig. 6, it is the structural representation of the MPPT control devices described in the embodiment of the present invention three.Specifically, by Fig. 6
Understand, the MPPT control devices may include：
Determining unit 61, available in photovoltaic cell to after main control module and the power supply of at least one auxiliary control module,
Determine the maximum power point of the supplying power for photovoltaic cell system；
Control unit 62, available for according to the maximum power point, control is sent at least one auxiliary control module
Signal, to adjust the output characteristics of itself based on the control signal by least one auxiliary control module.
Specifically, the determining unit 62, is particularly used in：
Determine the peak power output of the main control module；
It is determined that the output current corresponding with the peak power output of the main control module, and it is true based on the output current
The maximum power point of the fixed supplying power for photovoltaic cell system.
Further specifically, the determining unit 62, is particularly used in：
Determine the power central point of the main control module；
Left magnitude of voltage and right magnitude of voltage are determined respectively in output voltage corresponding to the power central point or so, and really
The fixed left magnitude of voltage and the corresponding left power points of the right magnitude of voltage difference and right power points；
If it is determined that the power central point be more than the left power points and the right power points and with the power center
Difference between the corresponding output current of point and the output current of at least one auxiliary control module is not more than given threshold,
The then peak power output using the power central point as the main control module；
If it is determined that the power central point no more than the left power points and the right power points or with the power
Difference between the output current of the corresponding output current of central point and at least one auxiliary control module is more than setting threshold
Value, then using one maximum in the left power points and the right power points as the power central point, and continue executing with
The operation of the left magnitude of voltage and the right magnitude of voltage is determined, until determining that the power central point is more than the left power points
And the right power points.
Specifically, the determining unit 62, is particularly used in：
According to the voltage steps of setting, multiple output voltages of the main control module are scanned successively from high to low, and really
The fixed multiple power outputs corresponding with the multiple output voltage；
Power central point using a power output maximum in the multiple power output as the main control module.
Further, the determining unit 62, it may also be used in the voltage steps according to setting, scan successively from high to low
Before multiple output voltages of the main control module, the main control module and at least one auxiliary control module are determined
Gross output be not less than the photovoltaic battery module peak power output.
The embodiment of the present invention three provides a kind of MPPT control devices, and the determining unit is in photovoltaic cell to master control molding
After block and at least one auxiliary control module power supply, it may be determined that the maximum power point of the supplying power for photovoltaic cell system；The control
Unit processed, control signal can be sent at least one auxiliary control module according to the maximum power point, with by it is described at least
One auxiliary control module adjusts the output characteristics of itself based on the control signal.Compared to prior art, the photovoltaic cell
Electric power system only includes a photovoltaic battery module so that the main control module and at least one auxiliary control module exist
Input stage is parallel with one another, ensure that the input of the main control module and at least one auxiliary control module is identical,
The uniformity of the output of the main control module and at least one auxiliary control module is thus also ensure that, so as to not only subtract
The quantity of photovoltaic battery module is lacked, has also improved the power supplying efficiency of supplying power for photovoltaic cell system and export the utilization of energy
Rate.
It will be understood by those skilled in the art that embodiments of the invention can be provided as method, apparatus (equipment) or computer journey
Sequence product.Therefore, in terms of the present invention can use complete hardware embodiment, complete software embodiment or combine software and hardware
The form of embodiment.Moreover, the present invention can use the calculating for wherein including computer usable program code in one or more
The computer program that machine usable storage medium is implemented on (including but is not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The present invention is the flow chart with reference to method, apparatus (equipment) and computer program product according to embodiments of the present invention
And/or block diagram describes.It should be understood that can be by each flow in computer program instructions implementation process figure and/or block diagram
And/or square frame and the flow in flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided to refer to
The processors of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is made to produce
One machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for realizing
The device for the function of being specified in one flow of flow chart or multiple flows and/or one square frame of block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which produces, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, so as in computer or
The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in individual square frame or multiple square frames.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then can make other change and modification to these embodiments.So appended claims be intended to be construed to include it is excellent
Select embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (15)
1. a kind of supplying power for photovoltaic cell system, it is characterised in that including photovoltaic battery module, main control module and at least one
Auxiliary control module, wherein：
The photovoltaic battery module, for being powered to the main control module and at least one auxiliary control module；
The main control module, for determining the maximum power point of the supplying power for photovoltaic cell system, and, according to the maximum
Power points, control signal is sent at least one auxiliary control module；
Each auxiliary control module at least one auxiliary control module, for according to the control signal received, adjusting
The whole output characteristics of itself.
2. supplying power for photovoltaic cell system as claimed in claim 1, it is characterised in that the main control module, specifically for logical
Cross the maximum power point that in the following manner determines the supplying power for photovoltaic cell system：
Determine the peak power output of the main control module；
It is determined that the output current corresponding with the peak power output of the main control module, and institute is determined based on the output current
State the maximum power point of supplying power for photovoltaic cell system.
3. supplying power for photovoltaic cell system as claimed in claim 2, it is characterised in that the main control module, specifically for logical
Cross the peak power output that in the following manner determines the main control module：
Determine the power central point of the main control module；
Left magnitude of voltage and right magnitude of voltage are determined respectively in output voltage corresponding to the power central point or so, and determine institute
State left magnitude of voltage and the right magnitude of voltage corresponding left power points and right power points respectively；
If it is determined that the power central point be more than the left power points and the right power points and with the power central point phase
Difference between the output current of corresponding output current and at least one auxiliary control module is not more than given threshold, then will
Peak power output of the power central point as the main control module；
If it is determined that the power central point no more than the left power points and the right power points or with the power center
Difference between the corresponding output current of point and the output current of at least one auxiliary control module is more than given threshold, then
Using one maximum in the left power points and the right power points as the power central point, and continue executing with and determine institute
The operation of left magnitude of voltage and the right magnitude of voltage is stated, until determining that the power central point is more than the left power points and institute
State right power points.
4. supplying power for photovoltaic cell system as claimed in claim 3, it is characterised in that the main control module, specifically for logical
Cross the power central point that in the following manner determines the main control module：
According to the voltage steps of setting, scan multiple output voltages of the main control module successively from high to low, and determine with
The corresponding multiple power outputs of the multiple output voltage；
Power central point using a power output maximum in the multiple power output as the main control module.
5. supplying power for photovoltaic cell system as claimed in claim 4, it is characterised in that in the voltage steps according to setting, from height
To before the low multiple output voltages for scanning the main control module successively, the main control module, it is additionally operable to：
Determine that the gross output of the main control module and at least one auxiliary control module is not less than the photovoltaic electric
The peak power output of pond module.
A kind of 6. maximal power tracing point MPPT control method, it is characterised in that including：
After photovoltaic cell is powered to main control module and at least one auxiliary control module, the supplying power for photovoltaic cell system is determined
The maximum power point of system；
According to the maximum power point, control signal is sent at least one auxiliary control module, with by described at least one
Auxiliary control module adjusts the output characteristics of itself based on the control signal.
7. MPPT control method as claimed in claim 6, it is characterised in that determine the maximum of the supplying power for photovoltaic cell system
Power points, including：
Determine the peak power output of the main control module；
It is determined that the output current corresponding with the peak power output of the main control module, and institute is determined based on the output current
State the maximum power point of supplying power for photovoltaic cell system.
8. MPPT control method as claimed in claim 7, it is characterised in that determine the maximum work output of the main control module
Rate, including：
Determine the power central point of the main control module；
Left magnitude of voltage and right magnitude of voltage are determined respectively in output voltage corresponding to the power central point or so, and determine institute
State left magnitude of voltage and the right magnitude of voltage corresponding left power points and right power points respectively；
If it is determined that the power central point be more than the left power points and the right power points and with the power central point phase
Difference between the output current of corresponding output current and at least one auxiliary control module is not more than given threshold, then will
Peak power output of the power central point as the main control module；
If it is determined that the power central point no more than the left power points and the right power points or with the power center
Difference between the corresponding output current of point and the output current of at least one auxiliary control module is more than given threshold, then
Using one maximum in the left power points and the right power points as the power central point, and continue executing with and determine institute
The operation of left magnitude of voltage and the right magnitude of voltage is stated, until determining that the power central point is more than the left power points and institute
State right power points.
9. MPPT control method as claimed in claim 8, it is characterised in that determine the power center of the main control module
Point, including：
According to the voltage steps of setting, scan multiple output voltages of the main control module successively from high to low, and determine with
The corresponding multiple power outputs of the multiple output voltage；
Power central point using a power output maximum in the multiple power output as the main control module.
10. MPPT control method as claimed in claim 9, it is characterised in that in the voltage steps according to setting, from high to low
Before the multiple output voltages for scanning the main control module successively, the MPPT control method also includes：
Determine that the gross output of the main control module and at least one auxiliary control module is not less than the photovoltaic electric
The peak power output of pond module.
A kind of 11. maximal power tracing point MPPT control devices, it is characterised in that including：
Determining unit, in photovoltaic cell to after main control module and the power supply of at least one auxiliary control module, it is determined that described
The maximum power point of supplying power for photovoltaic cell system；
Control unit, for according to the maximum power point, control signal to be sent at least one auxiliary control module, with by
At least one auxiliary control module adjusts the output characteristics of itself based on the control signal.
12. MPPT control devices as claimed in claim 11, it is characterised in that the determining unit, be specifically used for：
Determine the peak power output of the main control module；
It is determined that the output current corresponding with the peak power output of the main control module, and institute is determined based on the output current
State the maximum power point of supplying power for photovoltaic cell system.
13. MPPT control devices as claimed in claim 12, it is characterised in that the determining unit, be specifically used for：
Determine the power central point of the main control module；
Left magnitude of voltage and right magnitude of voltage are determined respectively in output voltage corresponding to the power central point or so, and determine institute
State left magnitude of voltage and the right magnitude of voltage corresponding left power points and right power points respectively；
If it is determined that the power central point be more than the left power points and the right power points and with the power central point phase
Difference between the output current of corresponding output current and at least one auxiliary control module is not more than given threshold, then will
Peak power output of the power central point as the main control module；
If it is determined that the power central point no more than the left power points and the right power points or with the power center
Difference between the corresponding output current of point and the output current of at least one auxiliary control module is more than given threshold, then
Using one maximum in the left power points and the right power points as the power central point, and continue executing with and determine institute
The operation of left magnitude of voltage and the right magnitude of voltage is stated, until determining that the power central point is more than the left power points and institute
State right power points.
14. MPPT control devices as claimed in claim 13, it is characterised in that the determining unit, be specifically used for：
According to the voltage steps of setting, scan multiple output voltages of the main control module successively from high to low, and determine with
The corresponding multiple power outputs of the multiple output voltage；
Power central point using a power output maximum in the multiple power output as the main control module.
15. MPPT control devices as claimed in claim 14, it is characterised in that the determining unit, be additionally operable to according to setting
Fixed voltage steps, before the multiple output voltages for scanning the main control module successively from high to low, determine the main control
The gross output of module and at least one auxiliary control module is not less than the maximum work output of the photovoltaic battery module
Rate.
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| CN201610872039.1A CN107887901A (en) | 2016-09-29 | 2016-09-29 | A kind of supplying power for photovoltaic cell system, MPPT control method and device |
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