CN106877311A - A kind of direct current photovoltaic generating system - Google Patents
A kind of direct current photovoltaic generating system Download PDFInfo
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- CN106877311A CN106877311A CN201710287209.4A CN201710287209A CN106877311A CN 106877311 A CN106877311 A CN 106877311A CN 201710287209 A CN201710287209 A CN 201710287209A CN 106877311 A CN106877311 A CN 106877311A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/12—Parallel operation of dc generators with converters, e.g. with mercury-arc rectifier
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Abstract
The present invention provides a kind of direct current photovoltaic generating system, at least one photovoltaic module is connected by the input of each power optimization device, and the output end by multiple power optimization devices is connected as an optimizer group, collect multiple optimizer groups using intelligent management apapratus, realize the communication between outside and each power optimization device, control each power optimization device to be run according to corresponding modes, generated electricity by way of merging two or more grid systems or off-grid.That is, the present invention is by single stage power optimizer combined with intelligent managing device, realize generating electricity by way of merging two or more grid systems instead of two-stage DC/DC systems of the prior art, solve the problems, such as in the prior art because the efficiency brought using two-stage DC/DC systems is low.
Description
Technical field
The present invention relates to photovoltaic generating system technical field, more particularly to a kind of direct current photovoltaic generating system.
Background technology
Currently, power optimization device collocation inverter is generated electricity by way of merging two or more grid systems, and has been widely used for the photovoltaic hair of AC network
Electric system, power optimization device therein is used to realize the function of maximal power tracing, and inverter is then responsible for the inversion of DC/AC.
Develop with advances in technology, direct current network, such as direct-current grid, smart home DC power-supply system, will be into
It is a kind of following electric power system form；Also, DC energy storage system is also following trend.And existing power optimization device
Plus the framework of inverter is directed to AC network, rather than direct current network and DC energy storage system.Direct current network and DC energy storage
The existing application of system is then to realize boosting and MPPT (MaximumPower Point by prime Boost circuit
Tracking, MPPT maximum power point tracking), then direct current network or DC energy storage system are connected to by the isolated DC/DC of rear class.
That is, existing direct current photovoltaic generating system, adds the structure structure of the isolated DC/DC of rear class by prime Boost
Into two-stage DC/DC systems, efficiency has to be hoisted.
The content of the invention
The present invention provides a kind of direct current photovoltaic generating system, to solve in the prior art because using two-stage DC/DC systems
The low problem of the efficiency brought.
To achieve the above object, the technical scheme that the application is provided is as follows：
A kind of direct current photovoltaic generating system, including：Multiple power optimization devices and an intelligent management apapratus；Wherein：
The input of each power optimization device connects at least one photovoltaic module；
The output end series connection of multiple power optimization devices, the two ends of series connection are an output end for optimizer group；
The intelligent management apapratus include multiple inputs, and at least one input is connected with an output for optimizer group
End；
The output end of the intelligent management apapratus is connected with direct current network or DC energy storage system；
The intelligent management apapratus are used to realize being connected in parallel for multiple optimizer groups, and excellent with outside and each power
Change the communication between device, control each power optimization device to be run according to corresponding modes, generated electricity by way of merging two or more grid systems or off-grid.
Preferably, the intelligent management apapratus include：
Joining unit, confluxes for the optimizer group that each input is connected to be carried out into parallel connection；
First communication unit, for being communicated with each power optimization device；
Second communication unit, for communication with the outside；
Quick shut-off device, for receiving outside input, realizes rapidly switching off；
Detection unit, detection and verification for realizing simultaneously network parameters and ambient parameter；
Grid-connected off-grid unit, for realizing the connection between joining unit and direct current network or DC energy storage system or disconnected
Open；
Central processing unit, with first communication unit, second communication unit, the detection unit, described quick
Cutoff device and the grid-connected off-grid unit are connected, for the communication realized and between outside and each power optimization device, control
Each power optimization device runs according to corresponding modes, is generated electricity by way of merging two or more grid systems or off-grid.
Preferably, the central processing unit is used to realize and the communication between outside and each power optimization device that control to be each
Individual power optimization device runs according to corresponding modes, when being generated electricity by way of merging two or more grid systems, specifically for：
The power that safe mode is run on after first communication unit or the detection unit obtain upper electricity is excellent
Change the number of device；
Judge whether the number exceedes predetermined number；
If the number exceedes the predetermined number, the output voltage for exporting setting by first communication unit refers to
Value and amplitude limit value to each power optimization device are made, controls each power optimization device to run on output voltage control mode, according to institute
Output voltage command value is stated to be exported；
The output voltage of optimizer group is obtained by the detection unit；
Judge whether the output voltage of optimizer group reaches predetermined threshold value；
If the output voltage of optimizer group reaches the predetermined threshold value, control the grid-connected off-grid unit to close, realize
Connection between joining unit and direct current network or DC energy storage system, is generated electricity by way of merging two or more grid systems.
Preferably, the central processing unit is used to realize and the communication between outside and each power optimization device that control to be each
Individual power optimization device runs according to corresponding modes, when carrying out off-grid, specifically for：
According to the relevant information of second communication unit, the detection unit or the Quick shut-off device, judge
Whether system current state meets system closedown condition；
If system current state meets the system closedown condition, off-grid is issued by first communication unit and is referred to
Order, controls each power optimization device to exit MPPT patterns, runs on safe mode；
The output current of optimizer group is obtained by the detection unit；
Judge the output current of optimizer group whether less than pre-set current value；
If the output current of optimizer group is less than the pre-set current value, the grid-connected off-grid unit is controlled to disconnect, it is real
Existing disconnection between joining unit and direct current network or DC energy storage system.
Preferably, when the output end of the intelligent management apapratus is connected with direct-current grid, the central processing unit is also used
In：
Detect when need to enter voltage source mode of operation, each power optimization device is respectively set as redundancy optimization device and non-
Redundancy optimization device；
The output voltage command value and amplitude limit value of setting are exported to each power optimization device by first communication unit,
Control each nonredundancy optimizer to run on output voltage control mode, exported according to the output voltage command value；
DC bus-bar voltage is obtained by the detection unit；
If the DC bus-bar voltage ascensional range exceedes first threshold, the output is updated according to default reduction step-length
Voltage instruction value；If the DC bus-bar voltage falls amplitude more than Second Threshold, update described according to default rising step-length
Output voltage command value；If the DC bus-bar voltage falls amplitude more than three threshold values, start redundancy optimization device, with default
Magnitude of voltage updates the output voltage command value.
Preferably, the intelligent management apapratus also include：
Discharge cell, is connected with the central processing unit, for the control after off-grid according to the central processing unit,
Realize the electric discharge for DC bus-bar voltage.
Preferably, the intelligent management apapratus also include：
Alarm Unit, is connected, for when the central processing unit with the central processing unit and second communication unit
When detection data according to the detection unit is judged as alarm status, outputting alarm information to second communication unit, and
Accordingly protected.
Preferably, the intelligent management apapratus also include：
Auxiliary power unit, for provided auxiliary power supply.
Preferably, the grid-connected off-grid unit includes soft starting circuit.
Preferably, under the safe mode, the output voltage of each power optimization device is 1V.
The direct current photovoltaic generating system that the present invention is provided, at least one is connected by the input of each power optimization device
Individual photovoltaic module, and the output end series connection for passing through multiple power optimization devices is an optimizer group, is converged using intelligent management apapratus
The multiple optimizer groups of collection, realize the communication between outside and each power optimization device, control each power optimization device according to corresponding
Mode operation, is generated electricity by way of merging two or more grid systems or off-grid.That is, the present invention is by single stage power optimizer combined with intelligent managing device,
Realize generating electricity by way of merging two or more grid systems instead of two-stage DC/DC systems of the prior art, solve in the prior art because using two-stage DC/DC systems
And the low problem of the efficiency brought.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention or in prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, the accompanying drawing in description is only this below
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the structural representation of direct current photovoltaic generating system provided in an embodiment of the present invention；
Fig. 2 is the structural representation of the direct current photovoltaic generating system that another embodiment of the present invention is provided；
Fig. 3 is the structural representation of the central processing unit that another embodiment of the present invention is provided；
Fig. 4 is the structural representation of the soft starting circuit that another embodiment of the present invention is provided；
Fig. 5 is the structural representation of the discharge cell that another embodiment of the present invention is provided；
Fig. 6 is the structural representation of the power optimization device that another embodiment of the present invention is provided.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only some embodiments of the present application, rather than whole embodiments.It is based on
Embodiment in the application, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of the application protection.
The present invention provides a kind of direct current photovoltaic generating system, to solve in the prior art because using two-stage DC/DC systems
The low problem of the efficiency brought.
Specifically, the direct current photovoltaic generating system, referring to Fig. 1 and Fig. 2, including：Multiple power optimization devices 101 and an intelligence
Can managing device 102；Wherein：
The input of each power optimization device 101 connects at least one photovoltaic module；
The output end series connection of multiple power optimization devices 101, the two ends of series connection are an output end for optimizer group 100；
Intelligent management apapratus 102 include multiple inputs, and at least one input is connected with an output for optimizer group
End；
The output end of intelligent management apapratus 102 is connected with direct current network or DC energy storage system；
Intelligent management apapratus 102 are used to realize being connected in parallel for multiple optimizer groups, and excellent with outside and each power
Change the communication between device 101, control each power optimization device 101 to be run according to corresponding modes, generated electricity by way of merging two or more grid systems or off-grid.
Fig. 1 show intelligent management apapratus 102 and is only connected with a situation for optimizer group 100, and Fig. 2 show intelligent pipe
Reason device 102 passes through the situation that multiple inputs connect multiple optimizer groups 100 respectively, many inside intelligent management apapratus 102
Individual optimizer group 100 is realized being connected in parallel, and then exports direct current network or DC energy storage system；Intelligent management apapratus 102 connect
The number of the optimizer group 100 for connecing is not limited herein, can be depending on its concrete application environment, in the protection model of the application
In enclosing.
Specifically operation principle is：
Power optimization device 101, according to the control of intelligent management apapratus 102, can be realized as a kind of DC/DC converters
Three models：Safe mode, output voltage control mode and MPPT patterns.Under safe mode, power optimization device 101 can be set
Output voltage than relatively low, such as 1V；Under output voltage control mode, power optimization device 101 is set with output voltage command value
Exported and no more than output voltage amplitude limit value；Under MPPT patterns, power optimization device 101 is realized for photovoltaic module most
High-power point tracking.The above-mentioned Three models of power optimization device 101 will be switched over according to the control of intelligent management apapratus 102,
Realize corresponding function.
Such as, after photovoltaic module receives illumination in the morning, intelligent management apapratus 102 control each power optimization device
101 are started working by safe mode, control each power optimization device 101 to run on output voltage control mould after reaching certain condition
Formula；After grid-connected, each power optimization device 101 into MPPT patterns, will realize the MPPT maximum power point tracking output of photovoltaic module.
And when the system is shut down, intelligent management apapratus 102 control each power optimization device 101 by MPPT pattern switchings to safe mode,
Meet the output that direct current network or DC energy storage system are cut to after certain condition, realize off-grid.
The direct current photovoltaic generating system that the present embodiment is provided, is connected to by the input of each power optimization device 101
A few photovoltaic module, and the output end series connection for passing through multiple power optimization devices 101 is an optimizer group, using intelligent management
Device 102 collects multiple optimizer groups, realizes the communication between outside and each power optimization device 101, controls each power excellent
Change device 101 to be run according to corresponding modes, generated electricity by way of merging two or more grid systems or off-grid.That is, the present embodiment passes through intelligent management apapratus 102
Above-mentioned functions, using single stage power optimizer 101, realize generating electricity by way of merging two or more grid systems instead of two-stage DC/DC systems of the prior art, solve
Determine in the prior art because of the problem that the efficiency brought using two-stage DC/DC systems is low, and by intelligent management apapratus 102
Intelligent management realizes the control of grid-connected and off-grid so that the cost of the direct current photovoltaic generating system is relatively low.
Another embodiment of the present invention additionally provides a kind of specific direct current photovoltaic generating system, in above-described embodiment and Fig. 1
On the basis of Fig. 2, referring to Fig. 3, intelligent management apapratus 102 include：Joining unit 201, the first communication unit 202, second
Communication unit 203, detection unit 204, Quick shut-off device 205, grid-connected off-grid unit 206, discharge cell 207, center treatment
Device 208, Alarm Unit 209 and auxiliary power unit；Wherein：
Joining unit 201, confluxes for the optimizer group that each input is connected to be carried out into parallel connection；As shown in Fig. 2 two
When optimizer group 100 is connected with two inputs of intelligent management apapratus 102 respectively, joining unit 201 is by two optimizer groups
100 carry out parallel connection confluxes.
First communication unit 202, for being communicated with each power optimization device 101；Specific communication mode can be used
Wire communication, such as electric line carrier communication, industrial field bus communication, and wireless telecommunications such as WIFI, ZigBee etc.；Herein
It is not specifically limited, can be depending on its concrete application environment, in the protection domain of the application.
Second communication unit 203, for communication with the outside；On the one hand by system related information, such as system generated energy,
Optimizer group state, protection alarm state etc., are delivered to user terminal, on the other hand receive the dependent instruction of user terminal, such as quick
Shut-off etc., passes to central processing unit 208.Specific communication mode can use wire communication, such as electric line carrier communication, industry
Field bus communication etc., and wireless telecommunications such as WIFI, ZigBee etc.；It is not specifically limited herein, its concrete application can be regarded
Depending on environment, in the protection domain of the application.
Detection unit 204, detection and verification for realizing simultaneously network parameters and ambient parameter；Multiple electricity can specifically be included
Pressure sensor, current sensor, temperature sensor, arc detection circuitry, insulating resistor detecting circuit etc., can realize to optimization
The DC bus-bar voltage of device group 100 and electric current, direct current network or DC energy storage system voltage and electric current, environment temperature, electric arc, insulation
The detection of many kinds of parameters such as resistance and verifying function.
Quick shut-off device 205, for receiving outside input, realizes rapidly switching off；The form of implementing can be a switch
Or button, when not grid-connected, as long as it is off state, system will all the time be in off-grid state；When grid-connected, as long as center treatment
Device 208 detects it and switches to off state from opening state, starts immediately and closes each power optimization device 101, off-grid and put
Electricity.
Grid-connected off-grid unit 206, for realizing the connection between joining unit and direct current network or DC energy storage system
Or disconnect；Specifically can including dc circuit breaker, relay, soft open circuit, corresponding control circuit etc., these physical circuits position
In the output side of intelligent management apapratus 102, can be according to the instruction execution system of central processing unit 208 is grid-connected and off-grid work(
Energy.
Preferably, grid-connected off-grid unit includes soft starting circuit.
Preferably, soft starting circuit as shown in figure 4, including：It is soft open resistance R1, the first relay S1, the second relay S2,
3rd relay S3 and breaker K；
First relay S1 is connected into series arm with the soft resistance R1 that opens；
Series arm and the second relay S2 are simultaneously unified into parallel branch；
Parallel branch is connected in series with the 3rd relay S3 and breaker K；
First relay S1, the second relay S2, the 3rd relay S3 and breaker K control end and central processing unit
108 are connected.
Discharge cell 207, for realizing the electric discharge for DC bus-bar voltage after off-grid；Can be processed according to center
The instruction of device 208 performs the discharging function to busbar voltage, and specific discharge loop can have diversified forms, a kind of possible shape
Formula is that discharge resistance is with the series connection of discharge loop switch and then with straight comprising discharge resistance, discharge loop switch and control circuit etc.
Stream bus is in parallel；It is not specifically limited herein, can be depending on its concrete application environment, in the protection domain of the application.
Preferably, discharge cell 207 as shown in figure 5, including：Resistance R2 and gate-controlled switch Q；
Resistance R2 is in parallel with dc bus after being connected with gate-controlled switch Q；
The control end of gate-controlled switch Q is connected with central processing unit 208.
Central processing unit 208, with the first communication unit 202, the second communication unit 203, detection unit 204, rapidly switch off
Device 205, grid-connected off-grid unit 206 and discharge cell 207 are connected, for realizing between outside and each power optimization device 101
Communication, control each power optimization device 101 according to corresponding modes run, generated electricity by way of merging two or more grid systems or off-grid；Specifically, central
Processor 208 receives the user instruction of outside input by the second communication unit 203, and then carries out response execution；And to intelligence
Unit inside managing device 102 carries out overall control.
Alarm Unit 209, is connected, for when central processing unit 208 with the communication unit 203 of central processing unit 208 and second
When detection data according to detection unit 204 is judged as alarm status, outputting alarm information is gone forward side by side to the second communication unit 203
The corresponding protection of row；Supplemental characteristic (voltage, electric current, temperature, electric arc, the insulaion resistance that can be obtained according to detection unit 204
Deng) the collaboration communication unit 203 of central processing unit 208 and second carries out respective handling, the effective protection to system is realized, to user
End provides correspondence warning information.
Auxiliary power unit, for provided auxiliary power supply, corresponding regulated power is provided to all power units in system.
This gives specific unit and corresponding function inside intelligent management apapratus 102, the intelligent management apapratus
102 conflux on the basis of box function possessing tradition, more standby intelligentized feature, by the coordination control of internal multiple units
System can realize the intelligent management control to direct current photovoltaic generating system.Certainly, shape is realized inside intelligent management apapratus 102
Formula is not necessarily limited to the above, can also be changed and increase and decrease depending on its concrete application environment, if can realize it is right
In the corresponding control of each power optimization device 101, enable each photovoltaic module for direct current network or DC energy storage system simultaneously
Net generates electricity or timely off-grid；Unit implements form, also no longer repeats one by one herein, the application's
In protection domain.
Above-described embodiment be Fig. 1 to Fig. 5 basis on, the direct current photovoltaic generating system realize generate electricity by way of merging two or more grid systems when,
The specific control process of central processing unit 208 is：
The power optimization device of safe mode is run on after the first communication unit 20 or detection unit 204 obtain upper electricity
101 number；
Judge whether the number exceedes predetermined number；
If the number exceed predetermined number, by the first communication unit 202 export setting output voltage command value and
Amplitude limit value controls each power optimization device 101 to run on output voltage control mode, according to defeated to each power optimization device 101
Go out voltage instruction value to be exported；
The output voltage of optimizer group 100 is obtained by detection unit 204；
Judge whether the output voltage of optimizer group 100 reaches predetermined threshold value；
If the output voltage of optimizer group 100 reaches predetermined threshold value, control grid-connected off-grid unit 206 to close, realize converging
Stream unit 201 and the connection between direct current network or DC energy storage system, are generated electricity by way of merging two or more grid systems.
Specifically, assume that the normal busbar voltage of direct current network that the direct current photovoltaic generating system is connected is 400V, it is single
The maximum output voltage of power optimization device 101 is 60V, and an optimizer group 100 includes 10 power optimization devices 101, rapidly switches off
Device 205 is in opening state.Direct current photovoltaic generating system shown in night, Fig. 1 or Fig. 2 is in off-network state.Enter when from night
Enter daytime, auxiliary power unit normal work, on power optimization device 101 electricity and after passing through self-inspection automatic running in safe mould
Formula, exports 1V, and communicated to intelligent management apapratus 102 by the first communication unit 202.
Safe mode is in when detection unit 204 detects existing 7 power optimization devices 101, meets entry condition (60V
× 7=420V>400V).Therefore, central processing unit 208 orders 7 online work(by sending instructions under the first communication unit 202
Rate optimizer 101 starts, output voltage 60V.After a while, detection unit 204 has detected DC bus-bar voltage
Through stabilization in 420V, grid-connected function is enabled.Referring to Fig. 4, now breaker K is in closure state, the first relay S1, second after
Electrical equipment S2, the 3rd relay S3 are in off-state.Start after grid-connected function, central processing unit 208 orders the 3rd first
Relay S3 is closed, and then orders the first relay S1 to close, by one section of time delay, such as 100ms, specifically by being used
Relay performance setting, afterwards, the DC bus-bar voltage that detection unit 204 detects optimizer group 100 is dropped to from 420V
400V or so, central processing unit 208 orders the second relay S2 closures, after one section of time delay, order the first relay
Device S1 disconnects.So as to complete grid-connected function.After grid-connected, because each power optimization device 101 cannot controlled output voltage again
60V is reached, therefore automatically switches to the work of MPPT patterns.
Said system starts scheme, and dash current when can realize grid-connected by corresponding soft starting circuit is smaller.
Preferably, when off-grid is realized, the specific control process of central processing unit 208 is the direct current photovoltaic generating system：
According to the relevant information of the second communication unit 203, detection unit 204 or Quick shut-off device 205, system is judged
Whether current state meets system closedown condition；
If system current state meets system closedown condition, off-grid is issued by the first communication unit 202 and is instructed, control
Each power optimization device 101 exits MPPT patterns, runs on safe mode；
The output current of optimizer group 100 is obtained by detection unit 204；
Judge the output current of optimizer group 100 whether less than pre-set current value；
If the output current of optimizer group 100 is less than pre-set current value, control grid-connected off-grid unit 206 to disconnect, realize
Disconnection between joining unit 201 and direct current network or DC energy storage system；
Control discharge cell 207 is turned on.
Specifically, the normal busbar voltage of direct current network for still being connected with the direct current photovoltaic generating system is as 400V, it is single
The maximum output voltage of power optimization device 101 is 60V, and an optimizer group 100 includes 10 optimizers, Quick shut-off device
205 be in opening state, as a example by illustrate.
Assuming that system jam, or no longer generate electricity into night, or user terminal sends during system normal power generation
Instruction is rapidly switched off, system current state will all meet system closedown condition.Central processing unit 208 passes through the second communication unit
203 receive this rapidly switch off instruction after, order all power optimization devices 101 to enter safe mode rapidly.Fig. 6 gives one kind
Typical power optimization device circuit, Fig. 5 gives a kind of typical DC bus-bar voltage discharge circuit, i.e. discharge cell 207.This
When, each power optimization device 101 exits MPPT patterns and enters safe mode, and power output drops to rapidly 0.Due to now still locating
In simultaneously net state, the output of power optimization device 101 is unable to reach 1V, and its output voltage is by line voltage and optimizer group 100
The number of the power optimization device 101 of series connection is determined, it is assumed that each power optimization device 101 being capable of equal component voltages, then power optimization device
101 output voltage is 40V.When it is 0 that detection unit 204 detects output current, the order relay S3 of central processing unit 208
Disconnected with S2.After by one section of time delay, such as after 100ms, specifically the relay performance by being used sets, due to
The DC bus-bar voltage for detecting is (such as 380V) higher, enables discharging function, and control gate-controlled switch Q closures are carried out at electric discharge
Reason.After a while, gate-controlled switch Q is disconnected.
By said system closing process, can realize close to zero current off-grid, reduce electric arc and dash current brings
Harm.
In addition, when the direct current photovoltaic generating system access direct-current grid when, except it is above-mentioned as current source in addition to, also may be used
Used as voltage source.
Preferably, when the output end of intelligent management apapratus 102 is connected with direct-current grid, central processing unit 208 is additionally operable to：
Detect need to enter voltage source mode of operation when, each power optimization device 101 is respectively set as redundancy optimization device
With nonredundancy optimizer；
The output voltage command value and amplitude limit value of setting are exported to each power optimization device by the first communication unit 202
101, control each nonredundancy optimizer to run on output voltage control mode, exported according to output voltage command value；
DC bus-bar voltage is obtained by detection unit 204；
If DC bus-bar voltage ascensional range exceedes first threshold, update output voltage according to default reduction step-length and instruct
Value；If DC bus-bar voltage falls amplitude more than Second Threshold, output voltage command value is updated according to default rising step-length；If
When DC bus-bar voltage falls amplitude more than three threshold values, start redundancy optimization device, updating output voltage with preset voltage value refers to
Make value.
Specifically, the normal busbar voltage of direct-current grid connected with the direct current photovoltaic generating system is as 400V, it is single
The maximum output voltage of power optimization device 101 is 60V, and optimizer group 100 includes 10 optimizers, as a example by illustrate.
When system connects direct-current grid, it is necessary to when working in voltage source mode, can set No. 10 power optimization device
101 is redundancy optimization device, and other No. 1~No. 9 power optimization devices 101 are nonredundancy optimizer, the optimizer output of setting nonredundancy
Voltage is 44.5V (44.5V × 9=400V), order nonredundancy optimizer output voltage command value.After a while,
Detection unit 204 drops into 386V to power network, falls more than Second Threshold, such as 10V, the now judgement of central processing unit 208 has
May have Partial Power optimizer 101 cannot provide enough power, therefore voltage instruction value is updated into 46.5V.Stepmother
Line line voltage rapidly rises to 400V.
When busbar voltage drops to 360V, fall more than the 3rd threshold value, such as 30V, the now judgement of central processing unit 208 is needed
Start No. 10 redundancy optimization devices, setting voltage command value is 40V, and No. 10 redundancy optimization devices of order start, and it is then updated again
He drops to 40V by the voltage instruction value of original nonredundancy optimizer.
In specific practical application, above-mentioned default reduction step-length, it is default raise step-length, first threshold, Second Threshold and
3rd threshold value, can accordingly be set according to actual application environment, be not specifically limited herein, in the guarantor of the application
In the range of shield.
Remaining operation principle is same as the previously described embodiments, no longer repeats one by one herein.
Each embodiment is described by the way of progressive in the present invention, and what each embodiment was stressed is and other realities
Apply the difference of example, between each embodiment identical similar portion mutually referring to.For device disclosed in embodiment
Speech, because it is corresponded to the method disclosed in Example, so description is fairly simple, related part is referring to method part illustration
.
The above, is only presently preferred embodiments of the present invention, and any formal limitation is not made to the present invention.Though
So the present invention is disclosed above with preferred embodiment, but is not limited to the present invention.It is any to be familiar with those skilled in the art
Member, in the case where technical solution of the present invention ambit is not departed from, all using the methods and techniques content of the disclosure above to the present invention
Technical scheme makes many possible variations and modification, or the Equivalent embodiments for being revised as equivalent variations.Therefore, it is every without departing from
The content of technical solution of the present invention, according to technical spirit of the invention to any simple modification made for any of the above embodiments, equivalent
Change and modification, still fall within the range of technical solution of the present invention protection.
Claims (10)
1. a kind of direct current photovoltaic generating system, it is characterised in that including：Multiple power optimization devices and an intelligent management apapratus；
Wherein：
The input of each power optimization device connects at least one photovoltaic module；
The output end series connection of multiple power optimization devices, the two ends of series connection are an output end for optimizer group；
The intelligent management apapratus include multiple inputs, and at least one input is connected with an output end for optimizer group；
The output end of the intelligent management apapratus is connected with direct current network or DC energy storage system；
The intelligent management apapratus are used to realize being connected in parallel for multiple optimizer groups, and with outside and each power optimization device
Between communication, control each power optimization device according to corresponding modes run, generated electricity by way of merging two or more grid systems or off-grid.
2. direct current photovoltaic generating system according to claim 1, it is characterised in that the intelligent management apapratus include：
Joining unit, confluxes for the optimizer group that each input is connected to be carried out into parallel connection；
First communication unit, for being communicated with each power optimization device；
Second communication unit, for communication with the outside；
Quick shut-off device, for receiving outside input, realizes rapidly switching off；
Detection unit, detection and verification for realizing simultaneously network parameters and ambient parameter；
Grid-connected off-grid unit, for realizing connection or disconnection between joining unit and direct current network or DC energy storage system；
Central processing unit, with first communication unit, second communication unit, the detection unit, described rapidly switch off
Device and the grid-connected off-grid unit are connected, and for the communication realized and between outside and each power optimization device, control each
Power optimization device runs according to corresponding modes, is generated electricity by way of merging two or more grid systems or off-grid.
3. direct current photovoltaic generating system according to claim 2, it is characterised in that the central processing unit be used to realizing with
Communication between outside and each power optimization device, controls each power optimization device to be run according to corresponding modes, carries out grid-connected hair
When electric, specifically for：
The power optimization device of safe mode is run on after first communication unit or the detection unit obtain upper electricity
Number；
Judge whether the number exceedes predetermined number；
If the number exceedes the predetermined number, the output voltage command value of setting is exported by first communication unit
With amplitude limit value to each power optimization device, each power optimization device is controlled to run on output voltage control mode, according to described defeated
Go out voltage instruction value to be exported；
The output voltage of optimizer group is obtained by the detection unit；
Judge whether the output voltage of optimizer group reaches predetermined threshold value；
If the output voltage of optimizer group reaches the predetermined threshold value, control the grid-connected off-grid unit to close, realize confluxing
Connection between unit and direct current network or DC energy storage system, is generated electricity by way of merging two or more grid systems.
4. direct current photovoltaic generating system according to claim 2, it is characterised in that the central processing unit be used to realizing with
Communication between outside and each power optimization device, controls each power optimization device to be run according to corresponding modes, when carrying out off-grid,
Specifically for：
According to the relevant information of second communication unit, the detection unit or the Quick shut-off device, system is judged
Whether current state meets system closedown condition；
If system current state meets the system closedown condition, off-grid is issued by first communication unit and is instructed, control
Make each power optimization device and exit MPPT patterns, run on safe mode；
The output current of optimizer group is obtained by the detection unit；
Judge the output current of optimizer group whether less than pre-set current value；
If the output current of optimizer group is less than the pre-set current value, control the grid-connected off-grid unit to disconnect, realize converging
Stream unit and the disconnection between direct current network or DC energy storage system.
5. direct current photovoltaic generating system according to claim 2, it is characterised in that the output end of the intelligent management apapratus
When being connected with direct-current grid, the central processing unit is additionally operable to：
Detect need to enter voltage source mode of operation when, each power optimization device is respectively set as redundancy optimization device and nonredundancy
Optimizer；
The output voltage command value and amplitude limit value of setting are exported to each power optimization device by first communication unit, is controlled
Each nonredundancy optimizer runs on output voltage control mode, is exported according to the output voltage command value；
DC bus-bar voltage is obtained by the detection unit；
If the DC bus-bar voltage ascensional range exceedes first threshold, the output voltage is updated according to default reduction step-length
Command value；If the DC bus-bar voltage falls amplitude more than Second Threshold, the output is updated according to default rising step-length
Voltage instruction value；If the DC bus-bar voltage falls amplitude more than three threshold values, start redundancy optimization device, with predeterminated voltage
Value updates the output voltage command value.
6. according to any described direct current photovoltaic generating system of claim 2 to 5, it is characterised in that the intelligent management apapratus
Also include：
Discharge cell, is connected with the central processing unit, for the control after off-grid according to the central processing unit, realizes
For the electric discharge of DC bus-bar voltage.
7. according to any described direct current photovoltaic generating system of claim 2 to 5, it is characterised in that the intelligent management apapratus
Also include：
Alarm Unit, is connected with the central processing unit and second communication unit, for when the central processing unit according to
When the detection data of the detection unit is judged as alarm status, outputting alarm information is carried out to second communication unit
Corresponding protection.
8. according to any described direct current photovoltaic generating system of claim 2 to 5, it is characterised in that the intelligent management apapratus
Also include：
Auxiliary power unit, for provided auxiliary power supply.
9. direct current photovoltaic generating system according to claim 2, it is characterised in that the grid-connected off-grid unit includes soft opening
Dynamic circuit.
10. the direct current photovoltaic generating system according to claim 3 or 4, it is characterised in that under the safe mode, each
The output voltage of power optimization device is 1V.
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