CN106972772B - A kind of inversion system and its operating voltage control method - Google Patents
A kind of inversion system and its operating voltage control method Download PDFInfo
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- CN106972772B CN106972772B CN201710317164.0A CN201710317164A CN106972772B CN 106972772 B CN106972772 B CN 106972772B CN 201710317164 A CN201710317164 A CN 201710317164A CN 106972772 B CN106972772 B CN 106972772B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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Abstract
The present invention provides a kind of operating voltage control method of inversion system, by the way that the output power of DC power supply to be compared with corresponding predetermined power；When the output power of DC power supply is greater than the maximum power that inverter can export, such as when being greater than the first predetermined power, new MPPT maximum power point tracking instruction is exported, control MPPT maximum power point tracking voltage is gradually decreased according to preset step-length；And when the output power of DC power supply is greater than the second predetermined power, not only control MPPT maximum power point tracking voltage gradually decreases according to preset step-length, while controlling the regulating device conducting of inverter direct-flow side, consumes the output power of DC power supply；When the output power of DC power supply being avoided to be greater than the maximum power that inverter can export, since inverter work is in high voltage, caused by inverter longevity shorten and system lower power production.
Description
Technical field
The present invention relates to contravarianter voltage control technology field, in particular to a kind of inversion system and its operating voltage control
Method.
Background technique
In the application field of inverter, there are some factors to be greater than inverter energy for the output power that will lead to DC power supply
The maximum power enough exported；Such as when inverter is in super under working condition, that is, assuming that the rated power of inverter is P, and
The capacity for configuring its DC power supply (such as photovoltaic battery panel) is N*P, so that inverter is under the conditions of certain illumination temperature, it is defeated
Power will be greater than P out.
When inverter surpasses timing, and under the conditions of certain illumination and temperature, the output power of DC power supply is greater than inverter
When the maximum power that can be exported, inverter is by the MPP electrical voltage point Umpp exported in DC power supply that cannot work, and operating point is electric
Pressure can be greater than MPP electrical voltage point Umpp；Super to match more, quiescent potential will be higher.
And inverter work is in high voltage, it will influence inverter longevity, and will appear high pressure drop volume and even shut down
The case where, to reduce system generated energy in some cases.
Summary of the invention
The present invention provides a kind of inversion system and its operating voltage control method, to solve in the prior art in DC power supply
Output power when being greater than the maximum power that inverter can export, influence inverter longevity and reduce system generated energy to ask
Topic.
To achieve the above object, technical solution provided by the present application is as follows:
A kind of operating voltage control method of inversion system, the controller applied to inversion system；The inversion system
Operating voltage control method includes:
The output power of DC power supply is compared with corresponding predetermined power；
If the output power of DC power supply is greater than the first predetermined power, new MPPT maximum power point tracking instruction, control are exported
MPPT maximum power point tracking voltage processed is gradually decreased according to preset step-length；
If the output power of DC power supply is greater than the second predetermined power, new MPPT maximum power point tracking instruction, control are exported
MPPT maximum power point tracking voltage processed is gradually decreased according to preset step-length, and controling adjustment device is connected；The two of the regulating device
End is connected with the DC side positive and negative anodes of inverter in inversion system respectively, is set between DC power supply and dc-link capacitance；
Second predetermined power is greater than first predetermined power, and first predetermined power is greater than inverter can be defeated
Maximum power out.
Preferably, after controling adjustment device conducting, further includes:
If the output power of DC power supply drops to less than third predetermined power, the regulating device shutdown is controlled；
The new MPPT maximum power point tracking instruction of the output, control MPPT maximum power point tracking voltage according to preset step-length by
After gradually reducing, further includes:
If the output power of DC power supply drops to less than the 4th predetermined power, the maximum under normal operating conditions is exported
Power points trace command；
The third predetermined power is less than second predetermined power, and it is default that the 4th predetermined power is less than described first
Power, the third predetermined power are greater than the 4th predetermined power, the third predetermined power and the 4th predetermined power
The maximum power that can be exported more than or equal to inverter.
Preferably, further includes:
Smaller operating voltage corresponding to the maximum power that inverter can be exported and the lower voltage limit of inverter carry out
Compare；
If the smaller operating voltage is less than the lower voltage limit, new MPPT maximum power point tracking instruction, control are exported
MPPT maximum power point tracking voltage is the lower voltage limit, and controls the regulating device conducting.
Preferably, the controling adjustment device conducting, comprising:
Control the regulating device normal open or copped wave output.
Preferably, the output power by DC power supply is compared with corresponding predetermined power, comprising:
First the output power of the DC power supply is compared with first predetermined power；
If the output power of the DC power supply is greater than first predetermined power, export new maximum power point with
Track instruction, control MPPT maximum power point tracking voltage are gradually decreased according to preset step-length and then by the output of the DC power supply
Power is compared with second predetermined power.
A kind of inversion system, comprising: inverter, regulating device and controller；The both ends of the regulating device respectively with institute
The DC side positive and negative anodes for stating inverter are connected, are set between DC power supply and dc-link capacitance；
The controller is used to execute the operating voltage control method of any of the above-described inversion system.
Preferably, the regulating device includes: resistance and switching tube；
The resistance and the switching tube are connected in series, and the both ends after series connection are positive and negative with the DC side of the inverter respectively
Extremely it is connected；
The control terminal of the switching tube is connected with the controller.
A kind of operating voltage control method of inversion system, the controller applied to stage type inversion system；The inversion
The operating voltage control method of system includes:
The output power of DC power supply is compared with corresponding predetermined power；
If the output power of DC power supply is greater than the 5th predetermined power, new MPPT maximum power point tracking instruction, control are exported
MPPT maximum power point tracking voltage processed is gradually decreased according to preset step-length；
If the output power of DC power supply is greater than the 6th predetermined power, the switching tube in prime DC/DC converter is controlled
Conducting, declines DC bus-bar voltage；When DC bus-bar voltage drops to preset threshold, the switching tube shutdown is controlled, with
The preset threshold is initial order voltage output MPPT maximum power point tracking instruction, until the output power of rear class inverter is it
The maximum power that can be exported；
6th predetermined power is greater than the 5th predetermined power, and the 5th predetermined power is greater than rear class inverter energy
The maximum power enough exported.
Preferably, the output power by DC power supply is compared with corresponding predetermined power, comprising:
First the output power of the DC power supply is compared with the 5th predetermined power；
If the output power of the DC power supply is greater than the 5th predetermined power, export new maximum power point with
Track instruction, control MPPT maximum power point tracking voltage are gradually decreased according to preset step-length and then by the output of the DC power supply
Power is compared with the 6th predetermined power.
A kind of inversion system, comprising: rear class inverter, controller and at least one prime DC/DC converter；
The controller is used to execute the operating voltage control method of above-mentioned inversion system.
The operating voltage control method of the inversion system provided by the invention, by by the output power of DC power supply with
Corresponding predetermined power is compared；When the output power of DC power supply is greater than the maximum power that inverter can export, such as
When being greater than the first predetermined power, new MPPT maximum power point tracking instruction, control MPPT maximum power point tracking voltage are exported according to pre-
If step-length gradually decreases；And the output power of DC power supply be greater than the second predetermined power when, not only control maximum power point with
Track voltage is gradually decreased according to preset step-length, while controlling the regulating device conducting of inverter direct-flow side, consumes DC power supply
Output power；When the output power of DC power supply being avoided to be greater than the maximum power that inverter can export, since inverter works
In high voltage, caused by inverter longevity shorten and system lower power production.
Detailed description of the invention
Technical solution in order to illustrate the embodiments of the present invention more clearly or in the prior art to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, it is only this that interior attached drawing, which is described below,
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the flow chart of the operating voltage control method of inversion system provided in an embodiment of the present invention；
Fig. 2 be another embodiment of the present invention provides DC power supply output power changing rule figure；
Fig. 3 be another embodiment of the present invention provides DC power supply output power changing rule figure；
Fig. 4 be another embodiment of the present invention provides DC power supply output power changing rule figure；
Fig. 5 be another embodiment of the present invention provides DC power supply output power changing rule；
Fig. 6 be another embodiment of the present invention provides inversion system operating voltage control method flow chart；
Fig. 7 be another embodiment of the present invention provides inversion system operating voltage control method flow chart；
Fig. 8 be another embodiment of the present invention provides inversion system operating voltage control method flow chart；
Fig. 9 be another embodiment of the present invention provides DC power supply output power changing rule figure；
Figure 10 be another embodiment of the present invention provides inversion system structural schematic diagram；
Figure 11 be another embodiment of the present invention provides stage type inversion system structural schematic diagram；
Figure 12 be another embodiment of the present invention provides inversion system operating voltage control method flow chart；
Figure 13 be another embodiment of the present invention provides inversion system operating voltage control method flow chart.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.It is based on
Embodiment in the application, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall in the protection scope of this application.
The present invention provides a kind of operating voltage control method of inversion system, to solve in the prior art in DC power supply
When output power is greater than the maximum power that inverter can export, the problem of influencing inverter longevity and reduce system generated energy.
Specifically, the operating voltage control method of the inversion system, the controller applied to inversion system；It, should referring to Fig. 1
The operating voltage control method of inversion system includes:
S101, the output power of DC power supply is compared with corresponding predetermined power；
The maximum power that these corresponding predetermined powers and inverter can export has certain relationship, by the device of inverter
Part design, height above sea level, environment temperature, DC bus-bar voltage etc. influence, it can under characterization conditions present, what inverter can export
Maximum power, and then whether the output power that can obtain DC power supply is greater than the maximum power that inverter can export.
If the output power of DC power supply is greater than the first predetermined power, S102 is thened follow the steps；
S102, the new MPPT maximum power point tracking instruction of output, control MPPT maximum power point tracking voltage according to preset step-length by
Gradually reduce；
First predetermined power can be a performance number more somewhat larger than the maximum power that inverter can export, specifically
It can be set according to actual application environment, be not specifically limited herein.
When the output power of DC power supply is greater than first predetermined power, control by export new maximum power point with
Track instruction, with control DC power supply output MPPT maximum power point tracking voltage, such as photovoltaic battery panel collector-shoe gear output
Voltage is gradually decreased according to preset step-length；The preset step-length can not do specific limit depending on specific application environment herein
It is fixed, within the scope of protection of this application.
If the output power of DC power supply is greater than the second predetermined power, S103 is thened follow the steps；
S103, the new MPPT maximum power point tracking instruction of output, control MPPT maximum power point tracking voltage according to preset step-length by
It gradually reduces, and controling adjustment device is connected；
The both ends of regulating device are connected with the DC side positive and negative anodes of inverter in inversion system respectively, are set to DC power supply
Between dc-link capacitance；
Second predetermined power is greater than the first predetermined power, and the first predetermined power is greater than the maximum work that inverter can export
Rate.
When the output power of DC power supply is greater than the second predetermined power more higher than the first predetermined power, then need to be connected
The regulating device of inverter direct-flow side can control its normal open or copped wave output, specifically to consume the output work of DC power supply
Rate, the output power for avoiding DC power supply excessive are fully entered to inverter, and the operating voltage of inverter is caused to increase.
In specific practical application, maximum power Pinv_m that inverter can export by inverter itself design,
The factors such as DC power supply (DC side photovoltaic battery panel) configuration, voltage, temperature, height above sea level codetermine.What inverter can export
Relationship between maximum power Pinv_m and the output voltage Udc of DC power supply referring to fig. 2, the maximum work that inverter can export
Pass of the relationship referring to Fig. 3, between the inverter maximum power Pinv_m that can be exported and height above sea level between rate Pinv_m and temperature T
System is referring to fig. 4.
Under inverter normal operating conditions, controller control DC power supply is exported with MPPT maximum power point tracking voltage,
The output power of inverter is equal to the output power of its received DC power supply；But due to certain factors, lead to DC power supply
Maximum power point Pmpp when being greater than the maximum power Pinv_m that inverter can export, the output power of DC power supply and inversion
Relationship between the operating voltage of device is referring to Fig. 5, corresponding two operating voltages of the maximum power Pinv_m that inverter can export:
Lesser operating voltage Uwork' and biggish operating voltage Uwork；When the output power of DC power supply can greater than inverter
When the maximum power Pinv_m of output, the operating voltage of inverter will be increased to Uwork' or more, the output work of DC power supply
Rate is bigger, and the operating voltage of inverter is higher, and the operating voltage is excessively high, it will influences inverter longevity, and will appear high pressure
The case where drop volume is even shut down, to reduce system generated energy in some cases.
The operating voltage control method of the inversion system provided in this embodiment is greater than inverse in the output power of DC power supply
Become device can export maximum power Pinv_m when, such as be greater than the first predetermined power when, export new maximum power point with
Track instruction, control MPPT maximum power point tracking voltage are gradually decreased according to preset step-length；And the output power in DC power supply is greater than
When the second predetermined power, not only controls MPPT maximum power point tracking voltage and gradually decreased according to preset step-length, while controlling inverter
The regulating device of DC side is connected, and consumes the output power of DC power supply；The output power of DC power supply is avoided to be greater than inverter
When the maximum power Pinv_m that can be exported, since inverter work is in high voltage, caused by inverter longevity shorten and
System lower power production.
It is worth noting that step S101 can be the output power of DC power supply point in specific practical application
It is not compared with the first predetermined power and the second predetermined power, referring to Fig. 1, when the output power of DC power supply is greater than first in advance
If when power, thening follow the steps S102；When the output power of DC power supply is greater than the second predetermined power, then follow the steps
S103。
Alternatively, referring to Fig. 6, step S101 is also possible to the output power of DC power supply according to sequencing respectively with
One predetermined power and the second predetermined power are compared, specifically, step S101 includes: the step S111 first carried out, and in step
Step S112 after rapid S102；
S111, the output power of DC power supply is compared with the first predetermined power；
If the output power of DC power supply is greater than the first predetermined power, is executing step S102, exporting new maximum work
Rate point trace command, control MPPT maximum power point tracking voltage gradually decrease and then execute step S112 according to preset step-length；
S112, the output power of DC power supply is compared with the second predetermined power；If the output power of DC power supply
When greater than the second predetermined power, then follow the steps S103, the new MPPT maximum power point tracking instruction of output, control maximum power point with
Track voltage is gradually decreased according to preset step-length, and controling adjustment device is connected.
The comparison of corresponding predetermined power is carried out according to sequencing as shown in FIG. 6, maximum can be made by step S102
Power points floating voltage gradually decreases, then judges whether that controling adjustment device is needed to be connected, and avoids erroneous judgement and regulating device
It is connected repeatedly.
On the basis of above-described embodiment and Fig. 1 to Fig. 6, another embodiment of the present invention additionally provides a kind of specific inverse
The operating voltage control method of change system, referring to Fig. 7, comprising:
S201, the output power of DC power supply is compared with corresponding predetermined power；
If the output power of DC power supply is greater than the first predetermined power, S202 is thened follow the steps；
S202, the new MPPT maximum power point tracking instruction of output, control MPPT maximum power point tracking voltage according to preset step-length by
Gradually reduce；
If the output power of DC power supply is greater than the second predetermined power, S203 is thened follow the steps；
S203, the new MPPT maximum power point tracking instruction of output, control MPPT maximum power point tracking voltage according to preset step-length by
It gradually reduces, and controling adjustment device is connected；
If the output power of DC power supply drops to less than third predetermined power, S204 is thened follow the steps；
S204, controling adjustment device shutdown；
If the output power of DC power supply drops to less than the 4th predetermined power, S205 is thened follow the steps；
MPPT maximum power point tracking instruction under S205, output normal operating conditions；
Wherein, third predetermined power is less than the second predetermined power, and for the 4th predetermined power less than the first predetermined power, third is pre-
If power is greater than the 4th predetermined power, third predetermined power and the 4th predetermined power are more than or equal to the maximum that inverter can export
Power.
When the output power of DC power supply is greater than the second predetermined power, controller will control the adjusting of inverter direct-flow side
Device conducting, to consume the output power of DC power supply, with being gradually reduced for DC power supply output power, when DC power supply
When output power drops to less than third predetermined power, controller will control regulating device shutdown, and inverter will receive direct current
Whole output powers of power supply.
When the output power of DC power supply is greater than the first predetermined power and the second predetermined power, controller will be exported newly
MPPT maximum power point tracking instruction, control MPPT maximum power point tracking voltage are gradually decreased according to preset step-length；With maximum power point
Floating voltage gradually decreases, and the output power of DC power supply will be also gradually reduced, when the output power of DC power supply drops to
When less than four predetermined powers, controller is instructed the MPPT maximum power point tracking under normal operating conditions is exported, and controls direct current
Source is normally exported with maximum power point voltage.
Work after being gradually reduced this gives the output power of DC power supply according to the control of controller is former
Reason；The value of the third predetermined power and the 4th predetermined power can be set according to specific application environment, not done herein
It is specific to limit, within the scope of protection of this application.
In addition, step S201 be also possible to according to sequencing by the output power of DC power supply respectively with the first default function
Rate and the second predetermined power are compared, then execute the step S203 and then according to sequencing, first by the defeated of DC power supply
Power is compared with third predetermined power out, then executes the step S204 and then by the output power of DC power supply and
Four predetermined powers are compared.
It can be specifically not specifically limited herein depending on its actual application environment, in the protection scope of the application
It is interior.
Another embodiment of the present invention additionally provides the operating voltage control method of another inversion system, in above-mentioned implementation
On the basis of example and Fig. 1 to Fig. 7, the operating voltage control method of the inversion system further includes as shown in Figure 8:
The lower voltage limit of smaller operating voltage and inverter corresponding to S301, the maximum power that can export inverter
It is compared；
If smaller operating voltage is less than lower voltage limit, S302 is thened follow the steps；
The new MPPT maximum power point tracking instruction of S302, output, control MPPT maximum power point tracking voltage are lower voltage limit, and control
Regulating device conducting processed.
Referring to Fig. 9, the maximum power Pinv_m that the maximum power point Pmpp of DC power supply is greater than that inverter can export is inverse
Become corresponding two operating voltages of maximum power Pinv_m that device can export: lesser operating voltage Uwork' and biggish work
Voltage Uwork；If the lower voltage limit Umin of inverter is greater than lesser operating voltage Uwork', controller will control direct current
The MPPT maximum power point tracking voltage in source is lower voltage limit, makes inverter work on its lower voltage limit Umin；Also, controller will
Controling adjustment device conducting exports its normal open or copped wave, to consume the output power of DC power supply, reduces direct current source stream
The power for entering inverter avoids the service life and the system generated energy that influence inverter.
Another embodiment of the present invention additionally provides a kind of inversion system, referring to Figure 10, comprising: inverter 101, regulating device
102 and controller；The both ends of regulating device 102 are connected with the DC side positive and negative anodes of inverter 101 respectively, are set to DC power supply
Between dc-link capacitance C；
Controller is for the output power of DC power supply to be compared with corresponding predetermined power；If the output of DC power supply
Power is greater than the first predetermined power, then export new MPPT maximum power point tracking instruction, control MPPT maximum power point tracking voltage according to
Preset step-length gradually decreases；If the output power of DC power supply be greater than the second predetermined power, export new maximum power point with
Track instruction, control MPPT maximum power point tracking voltage are gradually decreased according to preset step-length, and controling adjustment device is connected；Second is default
Power is greater than the first predetermined power, and the first predetermined power is greater than the maximum power that inverter can export.
Preferably, controller is also used to:
After controling adjustment device conducting, if the output power of DC power supply drops to less than third predetermined power,
Controling adjustment device shutdown；
It is gradually dropped exporting new MPPT maximum power point tracking instruction, control MPPT maximum power point tracking voltage according to preset step-length
After low, if the output power of DC power supply drops to less than the 4th predetermined power, the maximum under normal operating conditions is exported
Power points trace command；
Third predetermined power presets function less than the first predetermined power, third less than the second predetermined power, the 4th predetermined power
Rate is greater than the 4th predetermined power, and third predetermined power and the 4th predetermined power are more than or equal to the maximum work that inverter can export
Rate.
Preferably, controller is also used to:
Smaller operating voltage corresponding to the maximum power that inverter can be exported and the lower voltage limit of inverter carry out
Compare；If smaller operating voltage is less than lower voltage limit, export new MPPT maximum power point tracking instruction, control maximum power point with
Track voltage is lower voltage limit, and controling adjustment device is connected.
Preferably, controller is connected for controling adjustment device 102, is specifically used for:
102 normal open of controling adjustment device or copped wave output.
Preferably, referring to Fig. 9, regulating device 102 includes: resistance R0 and switch transistor T 0；
Resistance R0 and switch transistor T 0 are connected in series, the both ends after series connection respectively with the DC side positive and negative anodes phase of inverter 101
Even；
The control terminal of switch transistor T 0 is connected with controller.
Preferably, switch transistor T 0 are as follows: MOSFET (Metal-Oxide-Semiconductor Field-Effect
Transistor, metal-oxide half field effect transistor), (Insulated Gate Bipolar Transistor, insulated gate are double by IGBT
Bipolar transistor) pliotron, (Intergrated Gate Commutated Thyristors, integral gate change IGCT
Flow thyristor) or D.C. contactor etc..It is not specifically limited herein, depending on its application environment, in the protection of the application
In range.
In addition, controller can be individual controller, it also can integrate in inverter 101, do not do specific limit herein
It is fixed, depending on its application environment, within the scope of protection of this application.
Remaining working principle is same as the previously described embodiments, no longer repeats one by one herein.
Another embodiment of the present invention additionally provides a kind of operating voltage control method of inversion system, and it is inverse to be applied to stage type
The controller of change system (as shown in figure 11)；The operating voltage control method of the inversion system is referring to Figure 12, comprising:
S401, the output power of DC power supply is compared with corresponding predetermined power；
If the output power of DC power supply is greater than the 5th predetermined power, S402 is thened follow the steps；
S402, the new MPPT maximum power point tracking instruction of output, control MPPT maximum power point tracking voltage according to preset step-length by
Gradually reduce；
If the output power of DC power supply is greater than the 6th predetermined power, S403 is thened follow the steps；
Switching tube (the T in such as Figure 11 in S403, control prime DC/DC converter1) conducting, make under DC bus-bar voltage
Drop；When DC bus-bar voltage drops to preset threshold, control switch pipe shutdown, using preset threshold as initial order voltage output
MPPT maximum power point tracking instruction, until the output power of rear class inverter is its maximum power that can be exported；
6th predetermined power is greater than the 5th predetermined power, and the 5th predetermined power is greater than the maximum that rear class inverter can export
Power.
Preferably, the output power of DC power supply is compared with corresponding predetermined power in step S401, can be by
The output power of DC power supply is compared with the 5th predetermined power and the 6th predetermined power respectively according to sequencing, i.e. step
S401 includes as shown in fig. 13 that:
The step S411 first carried out, and step S412 after step s 102；
S411, the output power of DC power supply is compared with the 5th predetermined power；
If the output power of DC power supply is greater than the 5th predetermined power, is executing step S402, exporting new maximum work
Rate point trace command, control MPPT maximum power point tracking voltage gradually decrease and then execute step S412 according to preset step-length；
S412, the output power of DC power supply is compared with the 6th predetermined power；If the output power of DC power supply
When greater than six predetermined powers, S403 thened follow the steps, control the switching tube conducting in prime DC/DC converter, keep direct current female
Line voltage decline；When DC bus-bar voltage drops to preset threshold, control switch pipe shutdown, using preset threshold as initial order
Voltage output MPPT maximum power point tracking instruction, until the output power of rear class inverter is its maximum power that can be exported.
The comparison of corresponding predetermined power is carried out according to sequencing as shown in fig. 13 that, maximum can be made by step S402
Power points floating voltage gradually decreases, then judges whether to need to control the switching tube conducting of prime DC/DC converter, avoids judging by accident
Disconnected and switching tube conducting repeatedly.
Another embodiment of the present invention additionally provides another inversion system, as shown in figure 11, comprising: rear class inverter
201, controller and at least one prime DC/DC converter 202；
Controller is used to execute the operating voltage control method of inversion system described in above-described embodiment and Figure 12 and Figure 13.
Remaining working principle is same as the previously described embodiments, no longer repeats one by one herein.
Each embodiment is described in a progressive manner in the present invention, the highlights of each of the examples are with other realities
The difference of example is applied, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
Speech, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is referring to method part illustration
?.
The above described is only a preferred embodiment of the present invention, being not intended to limit the present invention in any form.Though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention.It is any to be familiar with those skilled in the art
Member, without departing from the scope of the technical proposal of the invention, all using the methods and technical content of the disclosure above to the present invention
Technical solution makes many possible changes and modifications or equivalent example modified to equivalent change.Therefore, it is all without departing from
The content of technical solution of the present invention, according to the technical essence of the invention any simple modification made to the above embodiment, equivalent
Variation and modification, all of which are still within the scope of protection of the technical scheme of the invention.
Claims (10)
1. a kind of operating voltage control method of inversion system, which is characterized in that the controller applied to inversion system；It is described inverse
The operating voltage control method of change system includes:
The output power of DC power supply is compared with corresponding predetermined power；
If the output power of DC power supply is greater than the first predetermined power, new MPPT maximum power point tracking instruction, control are exported most
High-power floating voltage is gradually decreased according to preset step-length；
If the output power of DC power supply is greater than the second predetermined power, new MPPT maximum power point tracking instruction, control are exported most
High-power floating voltage is gradually decreased according to preset step-length, and controling adjustment device is connected；The both ends of the regulating device point
It is not connected with the DC side positive and negative anodes of inverter in inversion system, is set between DC power supply and dc-link capacitance；
Second predetermined power is greater than first predetermined power, and first predetermined power is greater than what inverter can export
Maximum power.
2. the operating voltage control method of inversion system according to claim 1, which is characterized in that in the control and regulation
After device conducting, further includes:
If the output power of DC power supply drops to less than third predetermined power, the regulating device shutdown is controlled；
It is gradually dropped in the new MPPT maximum power point tracking instruction of the output, control MPPT maximum power point tracking voltage according to preset step-length
After low, further includes:
If the output power of DC power supply drops to less than the 4th predetermined power, the maximum power under normal operating conditions is exported
Point trace command；
The third predetermined power is less than second predetermined power, and the 4th predetermined power is less than the described first default function
Rate, the third predetermined power are greater than the 4th predetermined power, and the third predetermined power and the 4th predetermined power are big
In the maximum power that can be exported equal to inverter.
3. the operating voltage control method of inversion system according to claim 2, which is characterized in that further include:
Smaller operating voltage corresponding to maximum power that inverter can export is compared with the lower voltage limit of inverter；
If the smaller operating voltage is less than the lower voltage limit, new MPPT maximum power point tracking instruction, control maximum are exported
Power points floating voltage is the lower voltage limit, and controls the regulating device conducting.
4. the operating voltage control method of inversion system according to any one of claims 1 to 3, which is characterized in that the control
Regulating device conducting processed, comprising:
Control the regulating device normal open or copped wave output.
5. the operating voltage control method of inversion system according to any one of claims 1 to 3, which is characterized in that described to incite somebody to action
The output power of DC power supply is compared with corresponding predetermined power, comprising:
First the output power of the DC power supply is compared with first predetermined power；
If the output power of the DC power supply is greater than first predetermined power, refer in the MPPT maximum power point tracking for exporting new
It enables, control MPPT maximum power point tracking voltage and gradually decreased according to preset step-length and then by the output power of the DC power supply
It is compared with second predetermined power.
6. a kind of inversion system characterized by comprising inverter, regulating device and controller；The both ends of the regulating device
It is connected respectively with the DC side positive and negative anodes of the inverter, is set between DC power supply and dc-link capacitance；
The controller requires the operating voltage control method of 1 to 5 any inversion system for perform claim.
7. inversion system according to claim 6, which is characterized in that the regulating device includes: resistance and switching tube；
The resistance and the switching tube are connected in series, the both ends after series connection respectively with the DC side positive and negative anodes phase of the inverter
Even；
The control terminal of the switching tube is connected with the controller.
8. a kind of operating voltage control method of inversion system, which is characterized in that the controller applied to stage type inversion system；
The operating voltage control method of the inversion system includes:
The output power of DC power supply is compared with corresponding predetermined power；
If the output power of DC power supply is greater than the 5th predetermined power, new MPPT maximum power point tracking instruction, control are exported most
High-power floating voltage is gradually decreased according to preset step-length；
If the output power of DC power supply is greater than the 6th predetermined power, the switching tube conducting in prime DC/DC converter is controlled,
Decline DC bus-bar voltage；When DC bus-bar voltage drops to preset threshold, the switching tube shutdown is controlled, with described pre-
If threshold value is initial order voltage output MPPT maximum power point tracking instruction, until the output power of rear class inverter is that it can be defeated
Maximum power out；
6th predetermined power is greater than the 5th predetermined power, and the 5th predetermined power is greater than rear class inverter can be defeated
Maximum power out.
9. the operating voltage control method of inversion system according to claim 8, which is characterized in that described by DC power supply
Output power be compared with corresponding predetermined power, comprising:
First the output power of the DC power supply is compared with the 5th predetermined power；
If the output power of the DC power supply is greater than the 5th predetermined power, refer in the MPPT maximum power point tracking for exporting new
It enables, control MPPT maximum power point tracking voltage and gradually decreased according to preset step-length and then by the output power of the DC power supply
It is compared with the 6th predetermined power.
10. a kind of inversion system characterized by comprising rear class inverter, controller and at least one prime DC/DC transformation
Device；
Operating voltage control method of the controller for inversion system described in perform claim requirement 8 or 9.
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| CN110957781B (en) * | 2019-12-02 | 2021-02-09 | 浙江大学 | Non-communication floating charge control method for two-stage series photovoltaic power optimizer system |
| CN114157231A (en) * | 2021-11-27 | 2022-03-08 | 深圳市禾望科技有限公司 | Photovoltaic inverter and control method thereof |
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| CN103825299A (en) * | 2014-02-28 | 2014-05-28 | 深圳市长昊机电有限公司 | Grid-connected photovoltaic power generation system and control method thereof |
| CN104767221A (en) * | 2015-04-21 | 2015-07-08 | 国家电网公司 | Voltage regulation method based on inverter power coordination control |
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| CN103825299A (en) * | 2014-02-28 | 2014-05-28 | 深圳市长昊机电有限公司 | Grid-connected photovoltaic power generation system and control method thereof |
| CN104767221A (en) * | 2015-04-21 | 2015-07-08 | 国家电网公司 | Voltage regulation method based on inverter power coordination control |
| CN106026172A (en) * | 2016-06-28 | 2016-10-12 | 阳光电源股份有限公司 | Distributed photovoltaic inverter system and power-limiting control method thereof |
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