CN108258718A - Inverter, collecting and distributing type header box, limit power control system and method - Google Patents
Inverter, collecting and distributing type header box, limit power control system and method Download PDFInfo
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- CN108258718A CN108258718A CN201611248691.2A CN201611248691A CN108258718A CN 108258718 A CN108258718 A CN 108258718A CN 201611248691 A CN201611248691 A CN 201611248691A CN 108258718 A CN108258718 A CN 108258718A
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- H02J3/383—
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/32—Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/34—Electrical components comprising specially adapted electrical connection means to be structurally associated with the PV module, e.g. junction boxes
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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
A kind of inverter, collecting and distributing type header box, limit power control system and method, improve communication reliability.Limit power control system includes：Multiple collecting and distributing type header boxs, wherein, one end of each collecting and distributing type header box in multiple collecting and distributing type header boxs connect to receive power input from the battery panel components connected with one or more battery panel components in multiple battery panel components；And inverter, it is connect via dc bus with the other end of each collecting and distributing type header box in multiple collecting and distributing type header boxs, inverter includes：Receiving unit, for receiving power control instruction；Power control unit is limited, changes DC bus-bar voltage for being based on power control instruction, the multiple collecting and distributing type header box adjustment output power is made with the change based on DC bus-bar voltage, collecting and distributing type header box includes：Voltage detection unit, for detecting DC bus-bar voltage；Power control unit, for adjusting itself output power based on the obtained change of DC bus-bar voltage is detected.
Description
Technical field
This application involves power fields, more particularly, are related to the inverter in field of photovoltaic power generation, collecting and distributing type converges
Case, limit power control system and method.
Background technology
The energy is material base for the survival of mankind, and the finiteness of fossil energy and a large amount of exploitations, which utilize, causes the energy short
Lack and the problem of environmental pollution increasingly aggravate, solar energy as one of regenerative resource presently most cleaned with Utilization prospects,
It is using by common concern all over the world.
Collecting and distributing type photovoltaic generation solution is using MPPT maximum power point tracking (MPPT) optimizing and concentrates form of generating electricity by way of merging two or more grid systems,
Multichannel MPPT optimizing functions are realized by preposition multiple MPPT control optimizer, and inverse using centralized inverter after confluence
Become to realize efficient photovoltaic generation solution.Compared with traditional centralized inversion scheme and string type inversion scheme, collection
It dissipates the gene-ration revenue higher of formula photovoltaic generation solution and cost is lower.
Collecting and distributing type header box is provided with MPPT control softwares and DC/DC booster circuits, at least one electricity connected
Pond plate component carries out the dispersion tracking of MPPT, so as to reduce because the factors such as component parameter is inconsistent, local shades, elevation angle difference are led
The loss in efficiency of cause.In addition, the DC/DC booster circuits can increase DC input voitage, direct current cable transmission is thus reduced
Line loss.
Inverter employed in collecting and distributing type photovoltaic generation solution is usually centralized inverter, it can be by prime
The output of multiple collecting and distributing type header boxs is connected to the direct-flow input end of the inverter of rear class, realizes and concentrates inversion.In rear class
Inverter works in DC voltage-stabilizing state, and grid-connected power is controlled, therefore cannot be by traditional by multiple header boxs of prime
Method limit power (that is, realizing limit power by limiting grid-connected inverters electric current).If according to the conventional method to grid-connected electricity
Stream is limited, then the multiple collecting and distributing type header box still with the power of maximum power point can be exported, when described
When the output power of multiple collecting and distributing type header boxs is more than inverter limitation performance number, DC bus-bar voltage is uncontrolled, inverter
Voltage loop fails, and the extra energy of the multiple collecting and distributing type header box can be deposited directly on the DC support capacitance of inverter
On, form voltage potential.If the sum of output power of the multiple collecting and distributing type header box is differed with inverter power limits value
It is too big, then it will appear voltage overshoot, be easy to cause equipment damage.
For this problem, the limit power method of existing collecting and distributing type photovoltaic system is generally：Host computer is under inverter
Up to limit power instruction, inverter is instructed by communicating with sending to each collecting and distributing type header box in the form of power percentage, each
Collecting and distributing type header box limits the output power of oneself according to the limit power percentage being respectively received.However, due to each collection
Dissipate battery panel components irradiation level difference, the string formation configuration difference that formula header box is connected, some collecting and distributing type header box input energies
Larger, power can be limited, and some header box input energies are smaller, and power limit has not yet been reached, and limit power is inaccurate
Generated energy will be caused to lose.
In addition, in existing solution regarding to the issue above, limit power instruction is needed through communications, but by
In collecting-distributing system collecting and distributing type confluence box number it is more, communication reliability is low, it may appear that communication failure and collecting and distributing type is made to converge
The phenomenon that case power is uncontrolled.Also, collecting and distributing type header box, can be defeated by collecting and distributing type header box direct current after limit power instruction is received
Enter voltage (that is, output voltage of battery panel components) downward, this will cause battery panel components electric current to rise, DC/DC circuit conversions
Efficiency reduces.
Invention content
To solve the above problem of the prior art, this application provides one kind can improve communication reliability and collecting and distributing type
The circuit conversion efficiency of photovoltaic system and the inverter, collecting and distributing type header box, limit power control for accurately realizing target limitation power
System and method.
According to an embodiment of the invention, a kind of inverter is provided, for converging via dc bus and multiple collecting and distributing types
Case connects.The inverter includes：Receiving unit, for receiving power control instruction；Power control unit is limited, for being based on work(
Rate control instruction changes DC bus-bar voltage, adjusts the multiple collecting and distributing type header box with the change based on DC bus-bar voltage
Output power.
The limit power control unit specifically may include：Comparison module, for working as the multiple collecting and distributing type header box
The sum of preceding output power is compared with the threshold power specified in power control instruction；Power control module is limited, in institute
When stating comparison module and determining that the sum of present output power of the multiple collecting and distributing type header box is more than the threshold power, reduce straight
Stream busbar voltage reduces output power to trigger each collecting and distributing type header box connected, is determined in the comparison module described more
When the sum of present output power of a collecting and distributing type header box is less than the threshold power, raising DC bus-bar voltage company to trigger
The each collecting and distributing type header box connect improves output power.
The inverter may also include：Power recovery unit, for being based on power control in the limit power control unit
After have passed through predetermined timing time after instruction change DC bus-bar voltage, the DC bus-bar voltage after change is reverted to default
Operating voltage.
According to another embodiment of the present invention, a kind of collecting and distributing type header box is provided, for one end and multiple cell plate groups
The connection of one or more of part battery panel components from the battery panel components connected to receive power input, and the other end is via straight
Stream busbar is connect with inverter.The collecting and distributing type header box includes：Voltage detection unit, for detecting DC bus-bar voltage；Work(
Rate control unit is exported for the change of the DC bus-bar voltage detected based on the voltage detection unit to adjust itself
Power.
The voltage detection unit can detect DC bus-bar voltage according to prefixed time interval, and the power control unit can
When the voltage detection unit detects the voltage change value of DC bus-bar voltage within a predetermined period of time within a preset range,
Connected battery panel components output current is adjusted by the Voltage loop output violent change value inside changing, it is collecting and distributing so as to adjust this
The output power of formula header box.
The power control unit may include：First power control submodule, for working as the voltage detection unit detection
It is defeated to increase connected battery panel components by the Voltage loop output violent change value inside increasing when rising to DC bus-bar voltage
Go out electric current, so as to increase the output power of the collecting and distributing type header box；Second power control submodule, for working as the voltage detecting
When unit detects that DC bus-bar voltage declines, connected battery is reduced by the Voltage loop output violent change value inside reducing
Plate component output current, so as to reduce the output power of the collecting and distributing type header box.
According to another embodiment of the present invention, a kind of limit power control system is provided, including：Multiple collecting and distributing type header boxs
And inverter, wherein, one end and the multiple cell plate groups of each collecting and distributing type header box in the multiple collecting and distributing type header box
One or more battery panel components in part are connected to receive power input from the battery panel components connected, and described more
The other end of each collecting and distributing type header box in a collecting and distributing type header box is connect via dc bus with the inverter, the collection
It can be arbitrary collecting and distributing type header box described above to dissipate formula header box, and the inverter can be arbitrary inversion described above
Device.
According to another embodiment of the present invention, a kind of limit Poewr control method, for limiting power control system, institute are provided
It states limit power control system and includes multiple collecting and distributing type header boxs and inverter, each collection in the multiple collecting and distributing type header box
The one end for dissipating formula header box is connect, and the multiple collection with one or more battery panel components in multiple battery panel components
The other end for dissipating each collecting and distributing type header box in formula header box is connect via dc bus with inverter, the method includes：
Power control instruction is received by inverter；DC bus-bar voltage is changed based on the power control instruction received by inverter；By
Each collecting and distributing type header box detection DC bus-bar voltage, and output power is adjusted based on the change of DC bus-bar voltage.
The step of changing DC bus-bar voltage based on the power control instruction received by inverter may include：By inverter
The sum of present output power by the multiple collecting and distributing type header box compares with the threshold power specified in power control instruction
Compared with when the sum of present output power of the multiple collecting and distributing type header box is more than the threshold power, inverter reduces direct current
Busbar voltage reduces output power to trigger each collecting and distributing type header box connected, in working as the multiple collecting and distributing type header box
The sum of preceding output power be less than the threshold power when, inverter increase DC bus-bar voltage with trigger connected it is each collecting and distributing
Formula header box improves output power.
DC bus-bar voltage is detected, and exported to adjust based on the change of DC bus-bar voltage by each collecting and distributing type header box
The step of power, may include：DC bus-bar voltage is detected, and work as and detect according to prefixed time interval by collecting and distributing type header box
Within a predetermined period of time the voltage change value of DC bus-bar voltage within a preset range when, passed through in change by collecting and distributing type header box
The Voltage loop output violent change value in portion adjusts connected battery panel components output current, so as to adjust the collecting and distributing type header box
Output power.
It is described that connected solar panel is adjusted by the Voltage loop output violent change value inside changing by collecting and distributing type header box
Component output current, so as to adjust the collecting and distributing type header box output power the step of may include：When collecting and distributing type header box detects
When rising to DC bus-bar voltage, collecting and distributing type header box increases what is connected by the Voltage loop output violent change value inside increasing
Battery panel components output current, so as to increase the output power of the collecting and distributing type header box, when collecting and distributing type header box detects direct current
When busbar voltage declines, collecting and distributing type header box reduces connected solar panel by the Voltage loop output violent change value inside reducing
Component output current, so as to reduce the output power of the collecting and distributing type header box.
The method may also include：When have passed through predetermined timing after changing DC bus-bar voltage based on power control instruction
Between after, the DC bus-bar voltage after change is reverted into preset operating voltage by inverter.
By using inverter according to an embodiment of the invention as described above, collecting and distributing type header box, limit power control
System and method can improve limit power control accuracy, and due to being set between collecting and distributing type header box and inverter without communication
Standby to communicate, system Construction is at low cost and limit power reliability is high, additionally it is possible to improve collecting and distributing type header box limit power shape
Transfer efficiency under state.
Description of the drawings
Fig. 1 is the schematic structural diagram for the limit power control system for showing exemplary embodiment according to the present invention.
Fig. 2 is the flow chart for the limit Poewr control method for showing exemplary embodiment according to the present invention.
Fig. 3 is the exemplary process performed at inverter for showing exemplary embodiment according to the present invention.
Fig. 4 is the exemplary process performed at collecting and distributing type header box for showing exemplary embodiment according to the present invention.
Fig. 5 shows the exemplary diagram of the limit power signal on the dc bus of limit power control system.
Specific embodiment
Hereinafter, the exemplary embodiment that the present invention is more fully described with reference to the accompanying drawings, exemplary embodiment is in the accompanying drawings
It shows.However, it is possible to be embodied in many different forms exemplary embodiment, and should not be construed as being limited to illustrate herein
Exemplary embodiment.On the contrary, these embodiments are provided so that the disclosure will be thorough and complete, and will fully will be exemplary
The range of embodiment is communicated to those skilled in the art.
Fig. 1 is the schematic structural diagram for the limit power control system 100 for showing exemplary embodiment according to the present invention.
As shown in fig. 1, the limit power control system 100 includes：Multiple collecting and distributing type header box 110-1 to 110-N and inverter
120。
As shown in Figure 1, one end of each collecting and distributing type header box in the multiple collecting and distributing type header box 110-1 to 110-N
It is connect with a battery panel components in multiple battery panel components, to receive power input, institute from the battery panel components connected
The other end of each collecting and distributing type header box in multiple collecting and distributing type header box 110-1 to 110-N is stated via dc bus and inversion
Device 120 connects.In an embodiment of the present invention, inverter 120 can be DC/AC converters, and can connect via step-up transformer
It is connected to power grid.In addition, although a battery panel components, which are shown in FIG. 1, is connected to a collecting and distributing type header box, the present invention is not
It is limited to this, multiple battery panel components can be also connected to a collecting and distributing type header box.
With reference to Fig. 1, the inverter 120 of exemplary embodiment according to the present invention may include receiving unit 121 and limit power
Control unit 122.
Receiving unit 121 can be used for receiving power control instruction.In an exemplary embodiment of the present invention, receiving unit
121 can receive power control instruction from host computer.
Power control instruction change DC bus-bar voltage can be based on by limiting power control unit 122, to be based on dc bus electricity
The change of pressure makes the multiple collecting and distributing type header box 110-1 to 110-N adjustment output power.As shown in Figure 1, the limit power control
Unit 122 processed may include comparison module 122-1 and limit power control module 122-2.
The comparison module 122-1 can be by the sum of present output power of the multiple collecting and distributing type header box and power control
The threshold power specified in instruction is compared.And institute can be determined in the comparison module 122-1 by limiting power control module 122-2
When stating the sum of present output power of multiple collecting and distributing type header boxs more than the threshold power, DC bus-bar voltage is reduced to trigger
The each collecting and distributing type header box connected reduces output power, and determines the multiple collecting and distributing type in the comparison module 122-1
The sum of present output power of header box be less than the threshold power when, raising DC bus-bar voltage with trigger connected it is each
Collecting and distributing type header box improves output power.
More particularly, for example, comparison module 122-1 can detect the multiple collecting and distributing type confluence periodically or in real time
The sum of the present output power of case 110-1 to 110-N P_Now, by working as the multiple collecting and distributing type header box 110-1 to 110-N
The sum of preceding output power P_Now is compared with the threshold power P_Limit specified in power control instruction, and by comparison result
It exports and gives limit power control module 122-2.The multiple collecting and distributing type header box 110-1 to 110-N present output power it
When being more than the threshold power P_Limit with P_Now, limit power control module 122-2 can reduce DC bus-bar voltage to trigger
The each collecting and distributing type header box reduction output power connected, and working as in the multiple collecting and distributing type header box 110-1 to 110-N
When the sum of preceding output power P_Now is less than the threshold power P_Limit, limit power control module 122-2 can increase direct current mother
Line voltage improves output power to trigger each collecting and distributing type header box connected.
Only as an example, inverter 120 is operable with DC voltage-stabilizing 820V (that is, DC bus-bar voltage is made to be in 820V),
When the sum of the present output power of the multiple collecting and distributing type header box 110-1 to 110-N P_Now is more than the threshold power P_
Limit (for example, the sum of described present output power P_Now be more than the threshold power P_Limit keep the predetermined time (for example,
More than 1s)) when, DC bus-bar voltage can be adjusted downward to 800V to trigger what is connected by limit power control module 122-2 from 820V
Each collecting and distributing type header box reduces output power.In the present output power of the multiple collecting and distributing type header box 110-1 to 110-N
The sum of P_Now be less than the threshold power P_Limit (for example, the sum of described present output power P_Now be less than the threshold value work(
Rate P_Limit is kept for more than the predetermined time (for example, 1s)) when, limit power control module 122-2 can raise DC bus-bar voltage
To 820V output power is improved to trigger each collecting and distributing type header box connected.
With continued reference to Fig. 1, in multiple collecting and distributing type header box 110-1 to 110-N of exemplary embodiment according to the present invention
Each collecting and distributing type header box may include voltage detection unit 111 and power control unit 112.
Voltage detection unit 111 can detect DC bus-bar voltage.Power control unit 112 can be based on the voltage detecting list
The member 111 obtained change of DC bus-bar voltage of detection adjusts itself output power.
In an exemplary embodiment of the present invention, voltage detection unit 111 can be examined according to prefixed time interval (for example, 1s)
DC bus-bar voltage is surveyed, and the DC bus-bar voltage that detection is obtained is supplied to power control unit 112.When the voltage detecting
When unit 111 detects the voltage change value of DC bus-bar voltage within a predetermined period of time within a preset range, power control list
Member 112 can adjust connected battery panel components output current by the Voltage loop output violent change value U_Max inside changing, from
And adjust the output power of the collecting and distributing type header box.
In an embodiment of the present invention, the predetermined amount of time can be that (N is just whole for N times of the prefixed time interval
Number), and preferably, to make the voltage change value detection to DC bus-bar voltage more accurate and avoiding to dc bus electricity
Variation edge of the measurement in DC bus-bar voltage of pressure value, N can be set to larger than 1 positive integer, for example, when voltage detecting list
When member 111 detects DC bus-bar voltage according to the prefixed time interval of 1s, if detecting electricity of the DC bus-bar voltage in 2s
Press change value within a preset range, then power control unit 112, which can determine, needs the output power for adjusting oneself.
The preset range can be set according to the voltage value of DC bus-bar voltage.For example, that can incite somebody to action as in the example above
In the case that the normal working voltage of dc bus is set as 820V and limit power voltage is set as 800V, the preset range
Can be that -25V~-15V (detecting the situation that DC bus-bar voltage declines) and 15V~25V (detect DC bus-bar voltage
The situation of rising).That is, in an embodiment of the present invention, inverter 120 is by making DC bus-bar voltage reduce or increase
20V carries out power adjustment to trigger connected collecting and distributing type header box.However, due to the influence of actual environment, converged in collecting and distributing type
The voltage change of DC bus-bar voltage that stream case side is able to detect that may not be accurate ± 20V, in this feelings
Under condition, as long as the dc bus that collecting and distributing type header box detects changes in about ± 20V or so, you can determine to need to adjust output
Power.
In addition, as shown in Figure 1, the power control unit 112 may include：First power control submodule 112-1, is used for
When voltage detection unit 111 detects that DC bus-bar voltage rises, pass through the Voltage loop output violent change value U_Max inside increasing
Increase connected battery panel components output current, so as to increasing the output power of the collecting and distributing type header box；And second work(
Rate control submodule 112-2, for when the voltage detection unit 111 detects that DC bus-bar voltage declines, passing through reduction
Internal Voltage loop output violent change value U_Max reduces connected battery panel components output current, so as to reduce the collecting and distributing type
The output power of header box.
In particular, when voltage detection unit 111 detects DC bus-bar voltage rising and increasing degree is within a preset range,
First power control submodule 112-1 can increase the Voltage loop output violent change value U_Max inside the collecting and distributing type header box so that institute
The battery panel components output current of connection gradually increases, and battery panel components output voltage continuously decreases.As Voltage loop amplitude limit value U_
When Max is more than maximum power point current value, the battery panel components connected can be operated in the maximum power point of photovoltaic curve, later
Voltage and current no longer changes.In addition, when Voltage loop output violent change value U_Max is more than its upper limit value K2, the first power control
Voltage loop output violent change value U_Max can be set as K2 by module 112-1.In this way, the output power of battery panel components is by maximum work
It is gradually drawn close on the right side of rate point to maximum power point, system power is constantly promoted.
When voltage detection unit 111 detects DC bus-bar voltage decline and the range of decrease is within a preset range, the second work(
Rate control submodule 112-2 can reduce internal Voltage loop output violent change value U_Max so that the battery panel components output connected
Electric current is gradually reduced, the voltage ring filling of header box, and the output voltage of battery panel components constantly rises.In addition, work as Voltage loop
When output violent change value U_Max is less than its lower limiting value K1, the second power control submodule 112-2 can be by Voltage loop output violent change value U_
Max is set as K1.The battery panel components connected in this way are operated on the right side of photovoltaic curve maximum power point, and collecting and distributing type header box is defeated
Go out power reduction, and since the DC voltage of battery panel components is promoted, the efficiency of entire photovoltaic system improves.
Preferably, the inverter 120 of exemplary embodiment according to the present invention may also include power recovery unit and (not show
Go out), for being based on have passed through pre- devise a stratagem after power control instruction changes DC bus-bar voltage in the limit power control unit 122
When the time after, by the DC bus-bar voltage after change revert to normal working voltage (that is, it is non-limit power rating under voltage).
For example, as shown in Figure 5, pass through 5 points after DC bus-bar voltage is changed into 800V by limit power control unit 122 from 820V
After clock, power recovery unit (not shown) can voltage stabilizing be reset to 820V, and to timer again by DC bus-bar voltage, thus
Limit power is prevented without triggering or do not enter into limit power rating.Hereafter, if still needing to carry out limit power (for example, reducing collection
Dissipate the output power of formula header box), then inverter 120 and collecting and distributing type header box 110-1 to 110-N repeat limit as described above
Power flow.
In addition, if (the example within predetermined timing time after the limit change DC bus-bar voltage of power control unit 122
Such as, within 5min) the sum of the output power of collecting and distributing type header box 110-1 to 110-N decreases below in power control instruction and advises
Fixed threshold power, then power recovery unit (not shown) can detect the sum of described output power be equal to or less than power control
DC bus-bar voltage is just increased to 820V with by collecting and distributing type header box 110-1 to 110- during threshold power specified in system instruction
The sum of output power of N rises to the threshold power, without timing time predetermined described in timing.
In addition, although in the above examples, the normal working voltage of dc bus is set as 820V by inverter 120, but
In 120 initial start of inverter, can first by after DC bus-bar voltage voltage stabilizing to 800V for a period of time again voltage stabilizing to 820V, with
Open-circuit voltage is avoided to start false triggering limit power when being higher than 820V.
The present embodiment is defeated by the Voltage loop inside increasing when collecting and distributing type header box detects that DC bus-bar voltage rises
Go out amplitude limit value to increase connected battery panel components output current, reduce battery panel components output voltage, make header box work work(
Rate is drawn close to battery panel components maximum power point direction, so as to increase the output power of the collecting and distributing type header box, when collecting and distributing type converges
When stream case detects that DC bus-bar voltage declines, connected battery is reduced by the Voltage loop output violent change value inside reducing
Plate component output current improves battery panel components output voltage, makes header box operating power to far from battery panel components maximum work
The right side movement of rate point, so as to reduce the output power of the collecting and distributing type header box.
Above in association with Fig. 1 be described in detail it is according to an embodiment of the invention limit power control system 100 structure and its
The feature operation of each component, it should be appreciated, however, that every numerical value cited in above description is enumerated for the ease of understanding
Example, the application is without being limited thereto, more than parameters value can be set according to actual demand.
The limit Poewr control method of embodiment according to the present invention is described in detail below with reference to Fig. 2 to Fig. 4.
Fig. 2 is the flow chart for the limit Poewr control method for showing exemplary embodiment according to the present invention.Fig. 3 is to show root
According to the exemplary process performed at inverter 120 of exemplary embodiment of the present invention.Fig. 4 is to show according to the present invention show
The exemplary process performed at collecting and distributing type header box of example property embodiment.
With reference to Fig. 2, in step 201, can power control instruction be received by inverter 120.In an embodiment of the present invention, it is inverse
Power control instruction can be received from host computer by becoming device 120.
In step 203, DC bus-bar voltage can be changed based on the power control instruction received by inverter 120.With
The lower processing that will combine inverter 120 in Fig. 3 detailed description steps 203.
Fig. 3 is the exemplary process performed at inverter 120 for showing exemplary embodiment according to the present invention.
As shown in Figure 3, after power control instruction is received by the receiving unit 121 of inverter 120, in step
301, can comparison module 122-1 included in power control unit 122 be limited by multiple collecting and distributing type header boxs by inverter 120
The sum of present output power of 110-1 to 110-N is compared with the threshold power specified in power control instruction.
If the sum of present output power of the multiple collecting and distributing type header box 110-1 to 110-N is more than the threshold value work(
Rate (303- is), then in step 305, comparison module 122-1 also determines that the sum of described present output power is more than the threshold value work(
Whether the retention time of rate is more than the predetermined time (for example, 1s), if greater than the predetermined time (305- is), then in step
307, can be reduced by limit power control module 122-2 included in limit power control unit 122 DC bus-bar voltage (for example,
DC bus-bar voltage is down to 800V from 820V) output power is reduced to trigger each collecting and distributing type header box connected, if
Less than the predetermined time (305- is no), then in step 309, inverter 120 keeps current DC bus-bar voltage.
In addition, if the sum of present output power of the multiple collecting and distributing type header box 110-1 to 110-N is less than the threshold
It is worth power (303- is no), then in step 311, comparison module 122-1 also determines that the sum of described present output power is less than the threshold
Whether the retention time for being worth power is more than the predetermined time (for example, 1s), if greater than the predetermined time (311- is), then in step
Rapid 313, DC bus-bar voltage can be increased by limit power control module 122-2 (for example, DC bus-bar voltage is risen to from 800V
820V) increase output power to trigger each collecting and distributing type header box for being connected, if less than the predetermined time (311- is no),
Then in step 315, inverter 120 keeps current DC bus-bar voltage.
Preferably, it have passed through after limit power control unit 122 is based on power control instruction change DC bus-bar voltage pre-
It, can also be by power recovery unit (not shown) included in inverter 120 by the direct current after change after determining timing time
Busbar voltage reverts to preset operating voltage (that is, voltage under non-limit power rating), and timer is reset, and thus prevents
Limit power is without triggering or do not enter into limit power rating.
The process that all parts adjustment DC bus-bar voltage of inverter is described in detail in Fig. 1 has been combined above, therefore is
Simplicity, herein will not be described in further detail.
Referring back to Fig. 2, in step 205, each collecting and distributing type header box can detect DC bus-bar voltage, and female based on direct current
The change of line voltage adjusts respective output power.Each collecting and distributing type confluence in step 205 is described in detail below with reference to Fig. 4
The processing of case.
With reference to Fig. 4, in step 401, can be examined by the voltage detection unit 111 of collecting and distributing type header box according to prefixed time interval
Survey DC bus-bar voltage.
In step 403, can dc bus within a predetermined period of time be determined by the power control unit 122 of collecting and distributing type header box
Within a preset range whether the voltage change value of voltage.
When the voltage change value of the DC bus-bar voltage detected in the predetermined amount of time is in the preset range
When (403- is), in step 405, power control unit 122 can determine adjust the output power of oneself.In the embodiment of the present invention
In, power control unit 122 can be defeated to adjust connected battery panel components by the Voltage loop output violent change value inside changing
Go out electric current, so as to adjust the output power of the collecting and distributing type header box.In particular, when voltage detection unit 111 detects direct current
When busbar voltage rises, it can be passed through in increase by the first power control submodule 112-1 included in power control unit 112
The Voltage loop output violent change value in portion increases connected battery panel components output current, so as to increasing the collecting and distributing type header box
Output power.It, can be by being wrapped in power control unit 112 when voltage detection unit 111 detects that DC bus-bar voltage declines
The the first power control submodule 112-2 included reduces connected solar panel by the Voltage loop output violent change value inside reducing
Component output current, so as to reduce the output power of the collecting and distributing type header box.Fig. 1 has been combined above, and collecting and distributing type remittance is described in detail
The process of all parts adjustment output power of case is flowed, therefore for simplicity, will not be described in further detail herein.
In addition, when the voltage change value of DC bus-bar voltage detected in the predetermined amount of time is not described default
In the range of when (403- is no), collecting and distributing type header box can keep current state.
Pass through the limit power control system of application collecting and distributing type photovoltaic system according to an embodiment of the invention as described above
And method, can improve limit power control accuracy, and due between collecting and distributing type header box and inverter without communication equipment into
Row communication, system Construction is at low cost and limit power reliability is high, additionally it is possible to improve under collecting and distributing type header box limit power rating
Transfer efficiency.
Although the present invention, those skilled in the art are particularly shown and described with reference to its exemplary embodiment
It should be understood that in the case where not departing from the spirit and scope of the present invention that claim is limited, form can be carried out to it
With the various changes in details.
Claims (12)
1. a kind of inverter, for being connect via dc bus with multiple collecting and distributing type header boxs, which is characterized in that the inverter
Including：
Receiving unit, for receiving power control instruction；
Power control unit is limited, changes DC bus-bar voltage for being based on power control instruction, with based on DC bus-bar voltage
Change makes the multiple collecting and distributing type header box adjustment output power.
2. inverter as described in claim 1, which is characterized in that the limit power control unit specifically includes：
Comparison module, for by the sum of present output power of the multiple collecting and distributing type header box in power control instruction specify
Threshold power be compared；
Limit power control module, for determined in the comparison module present output power of the multiple collecting and distributing type header box it
During with more than the threshold power, reducing DC bus-bar voltage to trigger each collecting and distributing type header box connected reduces output work
Rate determines that the sum of present output power of the multiple collecting and distributing type header box is less than the threshold power in the comparison module
When, raising DC bus-bar voltage improves output power to trigger each collecting and distributing type header box connected.
3. inverter as claimed in claim 1 or 2, which is characterized in that further include：Power recovery unit, in the limit
After power control unit after power control instruction change DC bus-bar voltage based on have passed through predetermined timing time, after change
DC bus-bar voltage revert to preset operating voltage.
4. a kind of collecting and distributing type header box, for one or more of one end and multiple battery panel components battery panel components connect with
Power input is received from the battery panel components connected, the other end is connect via dc bus with inverter, which is characterized in that institute
Collecting and distributing type header box is stated to include：
Voltage detection unit, for detecting DC bus-bar voltage；
Power control unit, for the change of the DC bus-bar voltage detected based on the voltage detection unit come adjust from
Body output power.
5. collecting and distributing type header box as claimed in claim 4, which is characterized in that
The voltage detection unit, for detecting DC bus-bar voltage according to prefixed time interval；
The power control unit detects DC bus-bar voltage within a predetermined period of time for working as the voltage detection unit
Voltage change value within a preset range when, connected cell plate group is adjusted by the Voltage loop output violent change value inside changing
Part output current, so as to adjust the output power of the collecting and distributing type header box.
6. collecting and distributing type header box as claimed in claim 5, which is characterized in that the power control unit includes：
First power control submodule, for when the voltage detection unit detects that DC bus-bar voltage rises, passing through increasing
Internal Voltage loop output violent change value is added to increase connected battery panel components output current, so as to increase collecting and distributing type confluence
The output power of case,
Second power control submodule, for when the voltage detection unit detect DC bus-bar voltage decline when, by subtracting
The Voltage loop output violent change value of small inside reduces connected battery panel components output current, so as to reduce collecting and distributing type confluence
The output power of case.
7. a kind of limit power control system, including：Multiple collecting and distributing type header boxs, wherein, in the multiple collecting and distributing type header box
One end of each collecting and distributing type header box connect with one or more battery panel components in multiple battery panel components with from company
The battery panel components connect receive power input；And inverter；It is characterized in that, the collecting and distributing type header box is claim 4-
Collecting and distributing type header box described in any one of 6, the inverter are the inverter described in any one of claim 1-3.
8. a kind of limit Poewr control method, for limiting power control system, the limit power control system includes multiple collecting and distributing types
Header box and inverter, one end and the multiple cell plate groups of each collecting and distributing type header box in the multiple collecting and distributing type header box
One or more battery panel components connection in part, and each collecting and distributing type header box in the multiple collecting and distributing type header box
The other end connect via dc bus with inverter, the method includes：
Power control instruction is received by inverter；
DC bus-bar voltage is changed based on the power control instruction received by inverter；
DC bus-bar voltage is detected, and adjust output work based on the change of DC bus-bar voltage by each collecting and distributing type header box
Rate.
9. method as claimed in claim 8, which is characterized in that changed directly based on the power control instruction received by inverter
The step of flowing busbar voltage includes：
By inverter by the sum of present output power of the multiple collecting and distributing type header box and the threshold specified in power control instruction
Value power is compared,
When the sum of present output power of the multiple collecting and distributing type header box is more than the threshold power, inverter reduces direct current
Busbar voltage reduces output power to trigger each collecting and distributing type header box connected,
When the sum of present output power of the multiple collecting and distributing type header box is less than the threshold power, inverter raising direct current
Busbar voltage improves output power to trigger each collecting and distributing type header box connected.
10. method as claimed in claim 8 or 9, which is characterized in that by each collecting and distributing type header box detection dc bus electricity
Pressure, and included the step of adjusting output power based on the change of DC bus-bar voltage：
DC bus-bar voltage is detected, and work as and detect within a predetermined period of time according to prefixed time interval by collecting and distributing type header box
The voltage change value of DC bus-bar voltage within a preset range when, passed through by collecting and distributing type header box and change internal Voltage loop output
Amplitude limit value adjusts connected battery panel components output current, so as to adjust the output power of the collecting and distributing type header box.
11. method as claimed in claim 10, which is characterized in that described that voltage inside changing is passed through by collecting and distributing type header box
Ring output violent change value adjusts connected battery panel components output current, so as to adjust the output power of the collecting and distributing type header box
The step of include：
When collecting and distributing type header box detects that DC bus-bar voltage rises, collecting and distributing type header box is defeated by the Voltage loop inside increasing
Go out amplitude limit value to increase connected battery panel components output current, so as to increase the output power of the collecting and distributing type header box,
When collecting and distributing type header box detects that DC bus-bar voltage declines, collecting and distributing type header box is defeated by the Voltage loop inside reducing
Go out amplitude limit value to reduce connected battery panel components output current, so as to reduce the output power of the collecting and distributing type header box.
12. method as claimed in claim 8 or 9, further includes：It is passed through after DC bus-bar voltage is changed based on power control instruction
It has crossed after predetermined timing time, the DC bus-bar voltage after change is reverted into preset operating voltage by inverter.
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