CN205490408U - Group's string data inverter system - Google Patents
Group's string data inverter system Download PDFInfo
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- CN205490408U CN205490408U CN201620241935.3U CN201620241935U CN205490408U CN 205490408 U CN205490408 U CN 205490408U CN 201620241935 U CN201620241935 U CN 201620241935U CN 205490408 U CN205490408 U CN 205490408U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The utility model discloses a group's string data inverter system, include: main control unit for the real -time first discretivity of confirming each way photovoltaic group cluster in the same access combination, the second discretivity of the main maximum power point tracking circuit of confirming according to first discretivity to correspond, when the second discretivity exceedes the first threshold value of setting for, the access combination of adjustment maximum power point tracking circuit and photovoltaic group cluster, the second discretivity that makes each way owner maximum power point tracking circuit is less than the first threshold value of settlement, the maximum power point tracking circuit, with the main control unit electricity is connected for acquire the corresponding output parameter in each operating point of photovoltaic group cluster, and send output parameter to main control unit, change over switch for connect photovoltaic group cluster and maximum power point tracking circuit, be used for the access combination according to main control unit, switch the photovoltaic group cluster that the maximum power point tracking circuit inserted. The utility model discloses it organizes the effect that the parallelly connected mismatch of going here and there leads to the power loss because of the photovoltaic to have reached the reduction.
Description
Technical field
This utility model embodiment relates to technical field of photovoltaic power generation, particularly relates to a kind of group string inverter system
System.
Background technology
Solar energy because of have renewable, be available anywhere, power supply nearby, the advantage such as operating cost is low and pollution-free,
Have become as one of technology relative maturity in new energy field and the higher novel energy of development of exploitation level.
Group string (PV String) is to be in series by photovoltaic cell component (Photo Voltaic Module),
And photovoltaic cell component is to be formed by battery cell (cell) tight encapsulation after effectively series connection.Multichannel group
Connection in series-parallel accesses inverter, is used for absorbing solar energy and changing into electric energy by luminous energy very much, becomes inverter
Effective input.Owing to group string is installed in outdoor environment for a long time, it may occur however that due to birds droppings, leaves or cloud
Block Deng randomness and cause the output of certain road group string to decline.At present, employing group string inverter reduces
The impact of mismatch in parallel, but, owing to every road photovoltaic group string accesses the combination of MPPT maximum power point tracking circuit it is
Fix, some is blocked at random due to birds droppings, leaves or cloud etc. and the dynamic mismatch situation that causes still
Cannot solve.
Utility model content
This utility model provides one group string inverter system, to provide a kind of photovoltaic reducing power loss
The mode of group string Dynamic Packet.
A kind of group string inverter system that this utility model embodiment provides, including:
Master controller, for the output parameter according to each photovoltaic group string, determines that same access combines Nei Gelu
First dispersion of photovoltaic group string, determines that according to described first dispersion the principal maximum power points of correspondence follows the tracks of electricity
Second dispersion on road, when described second dispersion exceedes the first threshold of setting, adjusts maximum power point
Following the tracks of the access combination of circuit and photovoltaic group string, Shi Ge road principal maximum power points follows the tracks of the second dispersion of circuit
Less than the first threshold set；
MPPT maximum power point tracking circuit, electrically connects with described master controller, for obtaining each of photovoltaic group string
The output parameter that operating point is corresponding, and described output parameter is sent to described master controller；
Permutator, is used for connecting photovoltaic group string and MPPT maximum power point tracking circuit, for according to described master control
The access combination of device processed, switches the photovoltaic group string that described MPPT maximum power point tracking circuit accesses.
Further, described master controller includes:
Signal acquiring unit, for obtaining the same output electricity accessing combination Nei Ge road photovoltaic group string of current time
Pressure and output electric current；
First computing unit, for determining at same operating point according to described output voltage and output electric current and
The same Euclidean distance accessed between the photovoltaic group string of combination Nei Ge road；
Second computing unit, works as determining according to the Euclidean distance of current photovoltaic group string Yu remaining photovoltaic group string
First dispersion of front photovoltaic group string.
Further, described MPPT maximum power point tracking circuit includes:
Principal maximum power points follows the tracks of circuit, for following the trail of the maximum power point of at least one tunnel photovoltaic group string；
Detection MPPT maximum power point tracking circuit, is currently accessed for periodically detecting according to the periodic quantity set
The operating point of a road photovoltaic group string, to follow the trail of the road light being currently accessed detection MPPT maximum power point tracking circuit
The maximum power point of volt group string.
Further, every road photovoltaic group string is electric with multichannel MPPT maximum power point tracking circuit respectively by permutator
Connect.
Further, permutator element with anti-reverse charging function respectively in each road electrically connects.
Further, every road photovoltaic group string electrically connects with at least one permutator, to turn by Guan Bi is described
The mode changing in switch one group of contact accesses the MPPT maximum power point tracking circuit of correspondence.
This utility model embodiment is discrete by determine same access combination Nei Ge road photovoltaic group string in real time first
According to described first dispersion, degree, determines that the principal maximum power points of correspondence follows the tracks of the second dispersion of circuit,
When described second dispersion exceedes the first threshold of setting, adjust MPPT maximum power point tracking circuit and photovoltaic group string
Access combination, Shi Ge road principal maximum power points follow the tracks of circuit the second dispersion less than set first threshold,
Solve at present group string inverter and cannot tackle the problem because the mismatch in parallel that reason causes such as blocking at random, reach
Arrive by the way of dynamically adjusting and accessing combination, reduced the power caused because of the mismatch in parallel of photovoltaic group string and damage
The effect lost.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of group of string inverter system in this utility model embodiment one；
Fig. 2 a is the flow process of a kind of method preventing photovoltaic group string parallel connection mismatch in this utility model embodiment two
Figure；
Fig. 2 b is of a kind of method preventing photovoltaic group string parallel connection mismatch in this utility model embodiment two
Plant the access combination schematic diagram of photovoltaic group string and MPPT maximum power point tracking circuit；
Fig. 3 is the stream that the another kind in this utility model embodiment three prevents the method for photovoltaic group string parallel connection mismatch
Cheng Tu.
Detailed description of the invention
The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings.It is understood that
Specific embodiment described herein is used only for explaining this utility model, rather than to restriction of the present utility model.
It also should be noted that, for the ease of describing, accompanying drawing illustrate only the portion relevant to this utility model
Divide rather than entire infrastructure.
Embodiment one
Fig. 1 is the structural representation of a kind of group of string inverter system in this utility model embodiment one, tool
Body includes:
According to the output parameter of each photovoltaic group string, master controller 110, for determining that same access is combined in real time
First dispersion of Nei Ge road photovoltaic group string, determines the principal maximum power points of correspondence according to described first dispersion
Follow the tracks of the second dispersion of circuit, when described second dispersion exceedes the first threshold of setting, adjust maximum
Power points follows the tracks of the access combination of circuit and photovoltaic group string, and Shi Ge road principal maximum power points follows the tracks of the second of circuit
Dispersion is less than the first threshold set.
MPPT maximum power point tracking circuit 120, electrically connects with described master controller, for obtaining photovoltaic group string
The output parameter that each operating point is corresponding, and described output parameter is sent to described master controller.
Permutator 130, is used for connecting photovoltaic group string and MPPT maximum power point tracking circuit, for according to described
The access combination of master controller, switches the photovoltaic group string that described MPPT maximum power point tracking circuit accesses.
The technical scheme of the present embodiment, obtains each of photovoltaic group string by MPPT maximum power point tracking circuit 120
The output parameter that operating point is corresponding, and described output parameter is sent to described master controller 110.By master
According to the output parameter of each photovoltaic group string, controller 110 determines that same access combines Nei Ge road photovoltaic group in real time
First dispersion of string, determines that according to described first dispersion the principal maximum power points of correspondence follows the tracks of the of circuit
Two dispersions, when described second dispersion exceedes the first threshold of setting, adjust MPPT maximum power point tracking electricity
The access combination of road and photovoltaic group string, Shi Ge road principal maximum power points follows the tracks of the second dispersion of circuit less than setting
Fixed first threshold.Control permutator 130 by master controller 110 again to cut according to the access combination determined
Change the photovoltaic group string that described MPPT maximum power point tracking circuit accesses.The technical scheme of the present embodiment solves current group
String inverter cannot tackle the problem of the mismatch in parallel caused because of reasons such as randomness block, has reached to pass through
The Dynamic Matching of photovoltaic group string reduces the power loss that photovoltaic group string parallel connection mismatch causes, and then improves generated energy
Effect.
Further, described master controller 110 specifically for: in obtaining that current time is same and accessing combination each
The output voltage of road photovoltaic group string and output electric current.Determine same according to described output voltage and output electric current
Euclidean distance between the photovoltaic group string of at operating point and same access combination Nei Ge road.According to current photovoltaic group string
With the first dispersion that the Euclidean distance of remaining photovoltaic group string determines current photovoltaic group string.
Further, described MPPT maximum power point tracking circuit 120 includes:
Principal maximum power points follows the tracks of circuit, for following the trail of the maximum power point of at least one tunnel photovoltaic group string；
Detection MPPT maximum power point tracking circuit, is currently accessed for periodically detecting according to the periodic quantity set
The operating point of a road photovoltaic group string, to follow the trail of the road light being currently accessed detection MPPT maximum power point tracking circuit
The maximum power point of volt group string.
Further, described master controller 110, including:
First adjusts subelement, for discrete described in existence one tunnel the second of principal maximum power points tracking circuit
When degree is more than the first threshold set, it is judged that whether described detection MPPT maximum power point tracking circuit accesses photovoltaic group
String.
The photovoltaic group string the most then recorded according to described state matrix and the access of MPPT maximum power point tracking circuit
Situation, follows the tracks of the principal maximum power points that this photovoltaic group string access laststate is accessed of circuit, makes described inspection
Survey MPPT maximum power point tracking circuit to recover to the state not accessing photovoltaic group string.Described first threshold will be exceeded successively
The principal maximum power points of value follows the tracks of each road photovoltaic group string described detection MPPT maximum power point tracking of access that circuit includes
Circuit is to determine maximum power point, and according to setting rule, all photovoltaic group string is performed division operation again.
Wherein, the described rule that sets includes selecting same principal maximum power points to follow the tracks of in the access combination that circuit is corresponding the
The access combination that two dispersions are minimum, and the quantity of same road MPPT maximum power point tracking circuit access photovoltaic group string
Less than the access capacity preset.
If it is not, the principal maximum power points that then will be greater than described first threshold follows the tracks of the first dispersion maximum in circuit
Photovoltaic group string access described detection MPPT maximum power point tracking circuit.
And, second adjusts subelement, for following the tracks of circuit there is at least principal maximum power points described in two-way
The second dispersion more than set first threshold time, the principal maximum power of described first threshold will be exceeded successively
Point follows the tracks of each road photovoltaic group string described detection MPPT maximum power point tracking circuit of access that circuit includes, each to determine
The maximum power point of road photovoltaic group string.
According to setting rule, all photovoltaic group string performing division operation again, wherein, the described rule that sets is wrapped
Include and select same principal maximum power points to follow the tracks of the access group that during corresponding the accessing of circuit is combined, the second dispersion is minimum
Close, and same road MPPT maximum power point tracking circuit accesses the quantity of photovoltaic group string less than the access capacity preset.
Further, described group of string inverter system also includes:
Recover subelement, be used for judging to detect whether MPPT maximum power point tracking circuit accesses photovoltaic group string, if so,
Then obtain the operating point of the photovoltaic group string accessing detection MPPT maximum power point tracking circuit in real time, according to described photovoltaic
The principal maximum power points that first dispersion of group string present operating point and described photovoltaic group string laststate access
Follow the tracks of the first dispersion remaining photovoltaic group string in circuit, determine the master that described photovoltaic group string laststate accesses
Second dispersion of MPPT maximum power point tracking circuit.If the principal maximum merit that described photovoltaic group string laststate accesses
Rate point is followed the tracks of the second dispersion of circuit and is respectively less than described first threshold in the time span set, then by institute
State photovoltaic group string to recover to access the principal maximum power points tracking circuit that described laststate accesses, make described detection
MPPT maximum power point tracking circuit recovers to the state not accessing photovoltaic group string.
Embodiment two
A kind of method preventing photovoltaic group string parallel connection mismatch that Fig. 2 a provides for this utility model embodiment two
Flow chart, the photovoltaic group string that the present embodiment is applicable to solve to cause because of blocking of causing of randomness event
The situation of mismatch in parallel, the group string inverter system that the method can be provided by above-described embodiment performs.Logical
Cross group string inverter system to perform to prevent the method for photovoltaic group string parallel connection mismatch from specifically including following steps:
According to the output parameter of each photovoltaic group string, step 210, master controller determine that same access is combined in real time
First dispersion of Nei Ge road photovoltaic group string.
Wherein, photovoltaic group string refers in photovoltaic generating system, the assembly setting quantity the direct current being composed in series
The output unit of voltage.The access of photovoltaic group string as shown in Figure 2 b and MPPT maximum power point tracking circuit is combined and is shown
It is intended to.Every road photovoltaic group string is by the N group contact in permutator and N road MPPT maximum power point tracking circuit
(MPPT) connect.Access combination and refer to the access relation of photovoltaic group string and MPPT maximum power point tracking circuit.Herein
Access relation refer to which photovoltaic group string accesses which MPPT maximum power point tracking circuit (MPPT).If in advance
Regulation synchronization same principal maximum power points is followed the tracks of the quantity of the photovoltaic group string that circuit accesses and is less than 4 tunnels,
The quantity of the photovoltaic group string that synchronization detection MPPT maximum power point tracking circuit accesses is less than 1 tunnel.So,
Can determine in the way of using permutation and combination that 6 tunnel photovoltaic group string, 2 road principal maximum power points follow the tracks of circuit and 1
The access combined situation of road detection MPPT maximum power point tracking circuit.Represented by definition M × N rank state matrix S
Photovoltaic group string and the access situation of MPPT maximum power point tracking circuit, M representative group string quantity, N represents peak power
Point follows the tracks of circuit quantity, and the value of matrix element is defined by following formula.
The first dispersion Zhi Ge road photovoltaic group string discretization degree in each operating point.Multiple side can be passed through
Formula characterizes the first dispersion of each road photovoltaic group string.For example, it is possible under present operating point, define photovoltaic group
Euclidean distance between the output parameter of string is the dispersion between photovoltaic group string, represents with D.Such as, light
Output parameter at the maximum functional point of volt group string A is (Ua, Ia), at the maximum functional point of photovoltaic group string B
Output parameter be (Ub, Ib).Dispersion between photovoltaic group string A and photovoltaic group string B can be with following public
Formula represents.
In being calculated photovoltaic group string A and same road MPPT maximum power point tracking circuit other photovoltaic group string from
On the basis of divergence, it is calculated the dispersion of photovoltaic group string A by equation below.
Wherein, certain road MPPT maximum power point tracking circuit that I ≠ A, N are accessed by current time photovoltaic group string A
The quantity of entered photovoltaic group string.
It follows that obtain the same output voltage accessing combination Nei Ge road photovoltaic group string of current time and output
Electric current；Determine at same operating point according to described output voltage and output electric current and each in same access combination
Euclidean distance between the photovoltaic group string of road；True with the Euclidean distance of remaining photovoltaic group string according to current photovoltaic group string
First dispersion of settled front photovoltaic group string.
According to described first dispersion, step 220, master controller determine that the principal maximum power points of correspondence follows the tracks of electricity
Second dispersion on road.
Wherein, each road photovoltaic group string that the second dispersion is accessed by synchronization same road principal maximum power points
Between degree of closeness.Master controller can determine the second dispersion by equation below.
Wherein, N follows the tracks of the number of the photovoltaic group string that circuit is accessed by current time current road principal maximum power points
Amount, DiThe dispersion of photovoltaic group string in circuit is followed the tracks of for current road principal maximum power points.
The current work that same principal maximum power points follows the tracks of each road photovoltaic group string of circuit is accessed according at current time
Make the some principle closest to (the first dispersion is closest), each road photovoltaic group string is carried out Dynamic Packet.
Step 230, master controller, when described second dispersion exceedes the first threshold of setting, adjust maximum
Power points follows the tracks of the access combination of circuit and photovoltaic group string, and Shi Ge road principal maximum power points follows the tracks of the second of circuit
Dispersion is less than the first threshold set.
In order to prevent from switching frequently the photovoltaic group string of access principal maximum power points tracking circuit, preset the first threshold
Value.When the second dispersion principal maximum power points tracking circuit being detected exceedes default first threshold, then open
The dynamic adjustment of dynamic photovoltaic group string, Shi Ge road principal maximum power points is followed the tracks of the second dispersion of circuit and is all less than
Described first threshold.Such as, exceed described when the second dispersion that there is a road MPPT maximum power point tracking circuit
First threshold, then activate this road principal maximum power points and follow the tracks of the dynamic adjustment of the photovoltaic group string that circuit is accessed.
When the second dispersion that there is at least two-way principal maximum power points tracking circuit exceedes described first threshold, then swash
The overall situation of living dynamically adjusts, and is again grouped all photovoltaic group string.
The technical scheme of the present embodiment, by the output parameter according to each photovoltaic group string, determines same in real time
Access the first dispersion of combination Nei Ge road photovoltaic group string, determine the master of correspondence according to described first dispersion
High-power point follows the tracks of the second dispersion of circuit, when described second dispersion exceedes the first threshold of setting,
Adjusting the access combination of MPPT maximum power point tracking circuit and photovoltaic group string, Shi Ge road principal maximum power points follows the tracks of electricity
Second dispersion on road, less than the first threshold set, solves group string inverter at present and cannot tackle because of random
Property the problem of the mismatch in parallel that reason causes such as block, reached to reduce light by the Dynamic Matching of photovoltaic group string
The power loss that volt group connection in series-parallel mismatch causes, and then improve the effect of generated energy.
Embodiment three
Fig. 3 is the stream that the another kind in this utility model embodiment two prevents the method for photovoltaic group string parallel connection mismatch
Cheng Tu, specifically includes following steps:
Step 301, calculate that each road principal maximum power points testing circuit (being called for short main MPPT) accesses successively each
First dispersion of road photovoltaic group string, and second dispersion of the main MPPT in each road is determined according to the first dispersion.
Can be discrete according to the first of the photovoltaic group string of the current time same principal maximum power points testing circuit of access
Degree, determines that by the way of adding and averaging each road principal maximum power points follows the tracks of the second dispersion of circuit.
Relatively each road principal maximum power points follows the tracks of the second dispersion of circuit, determines maximum.Tool is exemplified below
Body computational methods, but the computational methods of the second dispersion of principal maximum power points tracking circuit are not limited to this example institute
The mode enumerated.Assuming that photovoltaic module uses 250W specification, every road photovoltaic group string includes 20 assemblies.Group
The power of string inverter is 30KW, follows the tracks of circuit and road detection maximum work including two-way principal maximum power points
Rate point follows the tracks of circuit, has 6 tunnel photovoltaic group string and has accessed group string inverter.Every road principal maximum power points with
Track circuit at most accesses 4 tunnel photovoltaic group string, and every road detection MPPT maximum power point tracking circuit accesses 1 road photovoltaic group
String.If the duty of certain moment photovoltaic group string known is: the first photovoltaic group string (DC1), the second photovoltaic group
String (DC2) and the 3rd photovoltaic group string (DC3) access the first principal maximum power points and follow the tracks of circuit (main MPPT1),
Output parameter is: DC1=(632V, 6.7A), DC2=(632V, 6.6A), DC3=(632V, 6.7A).
It is main that 4th photovoltaic group string (DC4), the 5th photovoltaic group string (DC5) and the 6th photovoltaic group string (DC6) access two
MPPT maximum power point tracking circuit (main MPPT2), output parameter is: DC4=(630V, 6.6A), DC6=(630V,
6.7A), DC6=(630V, 6.5A).Understand according to formula (1), photovoltaic group string and MPPT maximum power point tracking
The state matrix of the access situation of circuit is:
It is calculated according to formula (2): D12=0.1, D13=0, D21=0.1, D23=0.1, D31=0, D32=0.1.
Above-mentioned result of calculation is substituted into formula (3), is calculated: D1=0.05, D2=0.1, D3=0.05.
Again above-mentioned result of calculation is substituted into formula (4), be calculated the first principal maximum power points and follow the tracks of circuit
Dispersion is DM1=0.067.
Same, the dispersion that can be calculated the second principal maximum power points tracking circuit is DM2=0.133.
Step 302, judge whether second dispersion of the main MPPT in each road exceedes default first threshold, if so,
Then perform step 303, perform step 301 if it is not, return.
The second dispersion that each for current time road principal maximum power points is followed the tracks of circuit is entered with the first threshold preset
Row compares, when the second dispersion that there is at least one road principal maximum power points tracking circuit exceedes described first threshold
During value, perform step 303, otherwise, return and perform step 301.
Step 303, judge whether that second dispersion of at least main MPPT of two-way exceedes first threshold, if
It is then to perform step 307, otherwise, perform step 304.
Determine the second dispersion exceed default first threshold principal maximum power points follow the tracks of circuit quantity be
During one tunnel, then perform step 304.Determining that the second dispersion exceedes the principal maximum merit of default first threshold
When the quantity of rate point tracking circuit is more than two-way or two-way, then perform step 307.
Step 304, judge detect MPPT whether access photovoltaic group string, the most then perform step 305, no
Then perform step 306.
Master controller judges to detect whether MPPT maximum power point tracking circuit accesses photovoltaic group string.If it is determined that detection
MPPT maximum power point tracking circuit has accessed photovoltaic group string, then perform step 305.If it is determined that detection maximum work
Rate point is followed the tracks of circuit and is not accessed photovoltaic group string, then perform step 306.
Step 305, the main MPPT that the photovoltaic group string recovery access laststate accessing detection MPPT is accessed,
Release detection MPPT.
When determining that on detection MPPT maximum power point tracking circuit, access has photovoltaic group string, inquire about in this photovoltaic group string
The state matrix of one state.The photovoltaic group string recorded according to described state matrix and MPPT maximum power point tracking circuit
Access situation, this photovoltaic group string access principal maximum power points of being accessed of laststate is followed the tracks of circuit, makes
Detection MPPT maximum power point tracking circuit returns to not access the state of any photovoltaic group string.
Step 306, the second dispersion is exceeded the photovoltaic that in the main MPPT of first threshold, the first dispersion is maximum
Group concatenates into detection MPPT, after having performed this step, goes to perform step 310.
Determine do not access photovoltaic group string on detection MPPT maximum power point tracking circuit time, according to each in step 301
First dispersion of road photovoltaic group string.Understand, the second dispersion exceed the principal maximum power points of first threshold with
In the photovoltaic group string that track circuit is accessed, the photovoltaic group string that the first dispersion is maximum.By this first dispersion
Big photovoltaic group string accesses detection MPPT maximum power point tracking circuit.
Step 307, successively all photovoltaic group string access detection MPPT maximum power point tracking circuit (be called for short detection
MPPT), detect the maximum power point of every road photovoltaic group string, all photovoltaic group string carried out the first dispersion analysis,
Determine the access combination that second dispersion of the main MPPT in each road is minimum.
Determine the second dispersion exceed default first threshold principal maximum power points follow the tracks of circuit quantity be
Time more than two-way or two-way, successively the second dispersion is exceeded each road principal maximum power points of described first threshold
Follow the tracks of each road photovoltaic group string described detection MPPT maximum power point tracking circuit of access that circuit accesses.By detecting
High-power point is followed the tracks of circuit and is determined the maximum power point of each road photovoltaic group string accessed.To all photovoltaic group string
Carry out the first dispersion analysis, follow the tracks of, with synchronization same principal maximum power points, the photovoltaic group string that circuit accesses
The first minimum principle of dispersion difference, optimize the packet of all photovoltaic group string, the of the main MPPT in Shi Ge road
Two dispersions are the minima accessed in combination.Wherein, dispersion analysis can use the method for exhaustion, i.e. root
The access capacity of circuit is followed the tracks of, equal for the scheme of all possible access combination according to the principal maximum power points set
List, calculate the various combination Zhong Ge road principal maximum power points that accesses respectively further according to formula (4) and follow the tracks of circuit
Second dispersion.Thus, determine that minimum second dispersion of each road principal maximum power points tracking circuit is corresponding
Access combination.
Step 308, master controller start access procedure, control permutator and hold according to the access combination determined
Row photovoltaic group string handover operation.
Step 309, in real time determine detection MPPT whether access photovoltaic group string, the most then perform step 310,
If it is not, then perform step 301.
Master controller judges to detect whether MPPT maximum power point tracking circuit accesses photovoltaic group string.The most then perform
Step 310, otherwise, performs step 301.
Step 310, in real time acquisition access the operating point of the photovoltaic group string of detection MPPT, according to described operating point
When calculating the main MPPT accessed by the described photovoltaic group string described photovoltaic group string laststate of access in real time, main
Second dispersion of MPPT.
Master controller periodically obtains according to the periodic quantity set and accesses detection MPPT maximum power point tracking circuit
The output parameter in each operating point of photovoltaic group string.Meanwhile, determine be currently accessed detection maximum power point with
The principal maximum power points that the laststate of the photovoltaic group string of track circuit accesses follows the tracks of circuit.Obtain on current time
The principal maximum power points that one state accesses follows the tracks of circuit except the light being currently accessed detection MPPT maximum power point tracking circuit
Beyond volt group string, the residue photovoltaic group string output parameter in operating point corresponding to current time.According to time current
Carve the output of the output parameter of the corresponding operating point operating point corresponding with above-mentioned residue photovoltaic group string current time
The principal maximum power points that parameter determination laststate accesses follows the tracks of the second dispersion of circuit.
Whether step 311, real-time judge the second dispersion are respectively less than predetermined threshold value in the time span set,
The most then perform step 305, if it is not, then perform step 310.
If photovoltaic group string and the laststate principal maximum being currently accessed detection MPPT maximum power point tracking circuit being detected
The second dispersion remaining photovoltaic group string in power points tracking circuit is less than described first threshold, and in setting
It is respectively less than described first threshold in time threshold (dynamically can arrange according to practical situation), then performs step 305,
To avoid detection MPPT maximum power point tracking circuit to be taken by some photovoltaic group string for a long time.
Above-mentioned principal maximum power points is followed the tracks of circuit, detection MPPT maximum power point tracking circuit and master controller and is respectively provided with
In inverter.Wherein, principal maximum power points follow the tracks of circuit and detection MPPT maximum power point tracking circuit respectively with
Described master controller electrically connects, for obtaining the output parameter that each operating point of photovoltaic group string is corresponding, and will
Described output parameter sends to described master controller.
The technical scheme of the present embodiment realizes accessing the dynamic optimization packet of the photovoltaic group string of inverter, it is achieved and
Connection mismatch loss minimizes, and improves generated energy.
For the beneficial effect of the technical scheme of more specific description the present embodiment, hereby illustrative example is as follows:
Example one, the duty setting certain moment photovoltaic group string are as follows:
First photovoltaic group string (DC1), the second photovoltaic group string (DC2) and the 3rd photovoltaic group string (DC3) access
First principal maximum power points follows the tracks of circuit (main MPPT1), and output parameter is: DC1=(632V, 6.7A),
DC2=(632V, 6.6A), DC3=(632V, 6.7A).4th photovoltaic group string (DC4), the 5th photovoltaic group
String (DC5) and the 6th photovoltaic group string (DC6) access two principal maximum power points and follow the tracks of circuit (main MPPT2),
Output parameter is: DC4=(630V, 6.6A), DC6=(630V, 6.7A), DC6=(630V, 6.5A).
State matrix is:
Due to the impact of external environment condition, the first principal maximum power points follow the tracks of DC1 that circuit (main MPPT1) connect,
DC2, DC3 operating point changes, and output parameter becomes:
DC1=(601V, 6.9A), DC2=(601V, 6.8A), DC3=(601V, 4.2A).
Now the first principal maximum power points is followed the tracks of the second dispersion of circuit (main MPPT1) and is exceeded default the
One threshold value, needs photovoltaic group string DC3 maximum for the first dispersion in photovoltaic group string to be linked into detection maximum work
Rate point is followed the tracks of circuit, i.e. end-state matrix and is become S1, and each photovoltaic group string output parameter becomes: DC1=(632V,
6.7A), DC2=(632V, 6.6A), DC3=(629V, 4.1A).State matrix is:
After testing, after optimizing packet, DC side power improves 226.6W.
Example two,
If the duty of certain moment photovoltaic group string is as follows:
First photovoltaic group string (DC1), the second photovoltaic group string (DC2) and the 3rd photovoltaic group string (DC3) access
First principal maximum power points follows the tracks of circuit (main MPPT1), and output parameter is: DC1=(632V, 6.7A),
DC2=(632V, 6.6A), DC3=(632V, 6.7A).
4th photovoltaic group string (DC4), the 5th photovoltaic group string (DC5) and the 6th photovoltaic group string (DC6) access
Second principal maximum power points follows the tracks of circuit (main MPPT2), and output parameter is: DC4=(630V, 6.6A),
DC5=(630V, 6.7A), DC6=(630V, 6.5A).
State matrix is:
Due to the impact of external environment condition, the first principal maximum power points follow the tracks of DC1 that circuit (main MPPT1) connect,
DC2, DC3 operating point changes, and output parameter becomes:
DC1=(598V, 7.0A), DC2=(598V, 6.9A), DC3=(598V, 4.5A)；Second leads
DC4, DC5, DC6 operating point that high-power some tracking circuit (main MPPT2) is connect changes, output
Parameter becomes: DC4=(601V, 6.8A), DC5=(601V, 4.0A), DC6=(601V, 6.9A).
Now, the second dispersion of two-way principal maximum power points tracking circuit all exceedes the first threshold of setting,
According to calculating, optimal stage size is DC1, DC2, DC4, DC6 mono-group, and DC3, DC5 mono-group is respectively connected to
To main MPPT, i.e. end-state matrix becomes S2, and each photovoltaic group string output parameter becomes: DC1=(632V,
6.7A), DC2=(632V, 6.6A), DC4=(632V, 6.6A), DC6=(632V, 6.5A) are first
Group.DC3=(630V, 4.3A), DC5=(630V, 3.9A) are second group.State matrix is:
After testing, the DC side power before adjustment is 21640.9W, and after optimizing packet, DC side power is
21850.2W, improve 209.3W.
Note, above are only preferred embodiment of the present utility model and institute's application technology principle.Art technology
Those skilled in the art, it will be appreciated that this utility model is not limited to specific embodiment described here, are come by personnel
Say and can carry out various obvious change, readjust and substitute without departing from protection model of the present utility model
Enclose.Therefore, although by above example, this utility model is described in further detail, but this
Utility model is not limited only to above example, in the case of conceiving without departing from this utility model, it is also possible to
Including other Equivalent embodiments more, and scope of the present utility model is determined by scope of the appended claims.
Claims (6)
1. a group string inverter system, it is characterised in that including:
Master controller, for the output parameter according to each photovoltaic group string, determines same access in combination in real time
First dispersion of each road photovoltaic group string, according to described first dispersion determine correspondence principal maximum power points with
Second dispersion of track circuit, when described second dispersion exceedes the first threshold of setting, adjusts maximum work
Rate point follows the tracks of the access combination of circuit and photovoltaic group string, Shi Ge road principal maximum power points follow the tracks of the second of circuit from
Divergence is less than the first threshold set；
MPPT maximum power point tracking circuit, electrically connects with described master controller, for obtaining each of photovoltaic group string
The output parameter that operating point is corresponding, and described output parameter is sent to described master controller；
Permutator, is used for connecting photovoltaic group string and MPPT maximum power point tracking circuit, for according to described master control
The access combination of device processed, switches the photovoltaic group string that described MPPT maximum power point tracking circuit accesses.
The most according to claim 1 group of string inverter system, it is characterised in that described master controller
Including:
Signal acquiring unit, for obtaining the same output electricity accessing combination Nei Ge road photovoltaic group string of current time
Pressure and output electric current；
First computing unit, for determining at same operating point according to described output voltage and output electric current and
The same Euclidean distance accessed between the photovoltaic group string of combination Nei Ge road；
Second computing unit, works as determining according to the Euclidean distance of current photovoltaic group string Yu remaining photovoltaic group string
First dispersion of front photovoltaic group string.
The most according to claim 1 group of string inverter system, it is characterised in that described peak power
Point is followed the tracks of circuit and is included:
Principal maximum power points follows the tracks of circuit, for following the trail of the maximum power point of at least one tunnel photovoltaic group string；
Detection MPPT maximum power point tracking circuit, is currently accessed for periodically detecting according to the periodic quantity set
The operating point of a road photovoltaic group string, to follow the trail of the road light being currently accessed detection MPPT maximum power point tracking circuit
The maximum power point of volt group string.
The most according to claim 3 group of string inverter system, it is characterised in that every road photovoltaic group string
Electrically connected with multichannel MPPT maximum power point tracking circuit respectively by permutator.
The most according to claim 4 group of string inverter system, it is characterised in that each road permutator
Element with anti-reverse charging function electrically connects respectively.
The most according to claim 5 group of string inverter system, it is characterised in that every road photovoltaic group string
Electrically connect with at least one permutator, by by connecing in the way of closing one group of contact in described permutator
Enter the MPPT maximum power point tracking circuit of correspondence.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105656427A (en) * | 2016-03-25 | 2016-06-08 | 中兴能源（天津）有限公司 | Method for preventing parallel connection mismatch of photovoltaic strings and string type inverter system |
| CN108711927A (en) * | 2018-06-27 | 2018-10-26 | 北京汉能光伏投资有限公司 | A kind of light storage electricity generation system and method |
| CN108880460A (en) * | 2017-05-16 | 2018-11-23 | 丰郅(上海)新能源科技有限公司 | Buck-boost type electric pressure converter and voltage modulated method for photovoltaic module |
| CN109066972A (en) * | 2018-07-27 | 2018-12-21 | 易事特新能源合肥有限公司 | A kind of string type inverter |
| CN114884119A (en) * | 2022-04-29 | 2022-08-09 | 帝森克罗德集团有限公司 | Line matching method of photovoltaic grid-connected inverter control system |
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2016
- 2016-03-25 CN CN201620241935.3U patent/CN205490408U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105656427A (en) * | 2016-03-25 | 2016-06-08 | 中兴能源（天津）有限公司 | Method for preventing parallel connection mismatch of photovoltaic strings and string type inverter system |
| CN105656427B (en) * | 2016-03-25 | 2018-05-15 | 中兴能源（天津）有限公司 | A kind of method and string type inverter system for preventing photovoltaic string formation parallel connection mismatch |
| CN108880460A (en) * | 2017-05-16 | 2018-11-23 | 丰郅(上海)新能源科技有限公司 | Buck-boost type electric pressure converter and voltage modulated method for photovoltaic module |
| CN108880460B (en) * | 2017-05-16 | 2021-01-12 | 丰郅(上海)新能源科技有限公司 | Step-up and step-down voltage converter for photovoltaic module and voltage modulation method |
| CN108711927A (en) * | 2018-06-27 | 2018-10-26 | 北京汉能光伏投资有限公司 | A kind of light storage electricity generation system and method |
| CN109066972A (en) * | 2018-07-27 | 2018-12-21 | 易事特新能源合肥有限公司 | A kind of string type inverter |
| CN114884119A (en) * | 2022-04-29 | 2022-08-09 | 帝森克罗德集团有限公司 | Line matching method of photovoltaic grid-connected inverter control system |
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