CN104156028B - A kind of MPPT compensator of photovoltaic generating system - Google Patents
A kind of MPPT compensator of photovoltaic generating system Download PDFInfo
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- CN104156028B CN104156028B CN201410371289.8A CN201410371289A CN104156028B CN 104156028 B CN104156028 B CN 104156028B CN 201410371289 A CN201410371289 A CN 201410371289A CN 104156028 B CN104156028 B CN 104156028B
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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
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The present invention provides the MPPT compensator of a kind of photovoltaic generating system, including: the group string that DC/DC module, inverter and at least two are parallel with one another, each group string is connected to DC/DC module；One input of described DC/DC module is connected to bus positive pole, and another input is connected to bus negative pole；Two outputs of described DC/DC module are connected with bus and group string or are connected in series to bus by group respectively respectively；Work as busbar voltageWith the voltage corresponding to the maximum power point of any one group stringTime inconsistent, this DC/DC module output corresponding to group string compensates voltageSo that each group string is all operated in the power points of its maximum, wherein, described compensation voltage.The present invention is all in series with DC/DC module by each group string, and then can carry out voltage compensation respectively for each group string so that each group string is all operated in maximum power point, and the gross generation of system improves 3 ~ 5%.
Description
Technical field
The present invention relates to a kind of MPPT compensator, particularly relate to the MPPT compensator of a kind of photovoltaic generating system.
Background technology
Due to the otherness of cell panel itself, though the electricity of the different group string concatenation same number in photovoltaic generating system
Pond plate, the output total voltage of its photovoltaic group string is the most identical, and this may result in the peak power of each photovoltaic group string
Point also can be variant.And solar photovoltaic generation system has been achieved with large-scale application, large-sized photovoltaic power station is by all
Group string cell panel all and together, the most only one road MPPT, then, the electricity generation system in this large-sized photovoltaic power station is also
Each photovoltaic group string can not be made to be operated in maximum power point, and then reduce system generated energy；And due to photovoltaic group string
Property difference, pollution level and degree of aging inconsistent, the maximum power point of each group of string there will certainly be difference.
Summary of the invention
The technical problem to be solved is to need to provide a kind of photovoltaic carrying out voltage compensation for each group string
The MPPT compensator of electricity generation system so that each group string is all operated in maximum power point, promotes photovoltaic generating system
Generated energy, and conservative control cost.
To this, the present invention provides the MPPT compensator of a kind of photovoltaic generating system, including: DC/DC module, inversion
Device and at least two group string parallel with one another, each group string is connected to DC/DC module；Described DC/DC module
An input be connected to bus positive pole, another input is connected to bus negative pole；The two of described DC/DC module
Individual output is connected with bus and group string or is connected in series to bus by group respectively respectively；When busbar voltage V is with any
The voltage V corresponding to maximum power point of one group stringnTime inconsistent, this DC/DC module output corresponding to group string is mended
Repay voltage Δ VnSo that each group string is all operated in the power points of its maximum, wherein, described compensation voltage Δ Vn=V-Vn。
The present invention by each group string be all in series with DC/DC module, i.e. one organize go here and there or several groups be connected in series to one
In the individual module of DC/DC one to one, and then voltage compensation can be carried out respectively for each group string so that each
Group string is all operated in maximum power point so that the gross generation of whole photovoltaic generating system improves 3～5%..
Described group of string is the photovoltaic group string of photovoltaic generating system, and each group string is all in series with DC/DC module；Described
DC/DC module is the DC/DC module with multiple-channel output, the output of each road of this DC/DC module all with a group
String concatenation mutually is also all with MPPT function, and described DC/DC module acts on the outside of group string；Described DC/DC mould
Two outputs of block are connected with bus and group string respectively, or two outputs of described DC/DC module pass through respectively
Group is connected in series to bus；Described compensation voltage Δ VnFor each road output of DC/DC module group string to each connecting
Carrying out the compensation voltage exported, the group string that this compensation voltage enables to be compensated is operated under maximum power point,
And n is the natural number of representative group string number.
Described DC/DC module is in series with group string respectively by output, and then can carry out electricity for each group string
Pressure compensates, such as the voltage V that the maximum power point that busbar voltage is second group string is corresponding2Time, then second group of string reaches
Arrive maximum power point, but now the maximum power point of first group of string is at V1, then the DC/DC corresponding with first group of string
Output is compensated voltage Δ V by the output of module1=V2-V1So that first group of string is operated in maximum power point v1；And the
Output is compensated voltage Δ V by the output of the DC/DC module that three groups of strings are corresponding3=V2-V3So that the 3rd group of string work
At maximum power point V3.By the MPPT compensator of the present invention, so that each group in photovoltaic generating system
String is all operated in maximum power point, improves the generated energy of photovoltaic generating system, simultaneously as simply supplement part group
The portion voltage of string is poor, so, the power of DC/DC module is the least, low cost.
The voltage V corresponding to maximum power point of each group string describednIt is each discrepant, then, compensating it
Before, according to measuring each voltage organizing string and power relation in real time and then the maximum power point institute of each group string can be obtained
Corresponding voltage Vn；If power that measurement obtains some group string increases along with the increase of voltage, then this group string is described
Also do not arrive its maximum power point, now, continue to strengthen the voltage of this group string, increase by 2～5V the most every time, until should
When the power of group string reduces along with the increase of voltage, then illustrate that the voltage corresponding to the maximum power point of this group string just exists
Between this is measured and measured last time；Then, progressively reduce and this group is gone here and there the electricity measured this voltage and last time measured
Gap between pressure, reduces until finding power to increase from the increase along with voltage to be changed into along with the increase of voltage
Turning point, then the voltage that this turning point is corresponding is exactly this voltage V corresponding to group string maximum power pointn；Therefore, exist
Obtain the voltage V corresponding to maximum power point of each group stringn, it is possible to obtain each road output of DC/DC module
The required compensation voltage Δ V that group string is compensatedn, and then ensure that each group string is all operated in peak power
Point；And for the error of maximum power point, then depend primarily on the voltage difference between two adjacent measurements.Due to this
The mode that visible subsidy is repaid is to carry out independent and man-to-man voltage compensation for each group string, and compensatory reactionBu Changfanying speed is fast, effect
Rate is high, the speed of compensation can reach a millisecond rank, such as 100 milliseconds so that each group string all can be quick
To very effective voltage compensation, really improve the generated energy to photovoltaic generating system.
Further improvement of the present invention is, an output of described DC/DC module is connected to bus negative pole, described
Another output of DC/DC module is respectively connecting to the negative pole of each group string, the positive pole of described group of string and bus positive pole
It is connected.
It is to say, an input of described DC/DC module all receives bus positive pole, another input is all received
Bus negative pole；One output of described DC/DC module all receives bus negative pole, and another output is all received each
Group string in, thus by DC/DC module concatenation be placed on group string bottom, achieving lifting photovoltaic generating system
Generated energy and control on the basis of cost, also make wiring simple and clear, clear, Electrical specifications is orderly, the most error-prone.
Further improvement of the present invention is, an output of described DC/DC module is connected to bus positive pole, described
Another output of DC/DC module is connected to each group string positive pole, and the negative pole of described group of string is connected with bus negative pole.
It is to say, described DC/DC module is serially connected in the top of group string, an input of described DC/DC module
End all receives bus positive pole, and another input all receives bus negative pole；One output of described DC/DC module is all
Receiving bus positive pole, another output all receives the top of each group string, is achieving lifting photovoltaic generating system
Generated energy and control on the basis of cost, also make wiring simple and clear, clear, Electrical specifications is orderly, the most error-prone.
Further improvement of the present invention is, described DC/DC module includes at least two DC/DC unit, described
The quantity of DC/DC unit with group string quantity equal, each group string be all connected with one one to one DC/DC mono-
Unit.By the DC/DC module of most basic DC/DC unit member multiple-channel output, each group string is all connected with one
DC/DC unit one to one, each DC/DC unit is all with MPPT function to each group string
MPPT control the most flexible effectively, with strong points, efficiency height.
Further improvement of the present invention is, an output of described DC/DC unit is all connected directly to bus, separately
One output then concatenates mutually with each self-corresponding group of string, forms between described DC/DC unit and group string connected in series
Newly organize string, parallel with one another between each new group of string.
Further improvement of the present invention is, described DC/DC module includes controller, first order converter and the second level
Converter, described controller is connected with first order converter and second level converter respectively.Wherein, the described first order
Converter is preferably realized by isolated form full-bridge phase shifting unit, and described second level converter is preferably come by pressure unit
Realize.
Further improvement of the present invention is, the quantity of described second level converter is equal with the quantity of group string, described control
Device processed and first order converter are connected to organize one to one the performance loop of string by second level converter respectively.
Further improvement of the present invention is, described controller sends driving signal respectively to first order converter and second
Level converter；Described controller gathers input voltage and the output voltage of second level converter of first order converter respectively,
And then control the output voltage of each second level converter, i.e. and then control the output voltage to second level converter and adjust
Whole.
Further improvement of the present invention is, described DC/DC module includes MPPT unit, described MPPT unit bag
Include following steps: first, the voltage and current of controller collection group string, calculate the output general power of current group string；
Secondly, first order converter and second level converter are started working, and attempt increasing or reducing the output voltage of current group string；
Then, controller gathers the voltage and current of this group string again, if this group string power increases, the most again to equidirectional
Adjust its output voltage；If power drop, then attempt adjusting its output voltage to opposite direction；Until finding this group string
Maximum power point.
Wherein, described MPPT unit is for realizing the MPPT function to each group string.
Further improvement of the present invention is, described inverter also includes MPPT module, for realizing busbar voltage
Adjustment；The MPPT module work period of described inverter is much larger than the work week of the MPPT unit of DC/DC module
Phase, both to realize step the same.
The MPPT module cycle of inverter is long, is responsible for adjusting to system maximum power point (mpp) busbar voltage.And
The MPPT unit of DC/DC module, on stable busbar voltage, is responsible for the electricity of maximum power point before compensation group string
Pressure reduction so that each group of string is operated in maximum power point.Because DC/DC module output voltage is relatively low, if bus is electric
Press through low or too high so that busbar voltage is away from the maximum power point voltage of group string, then DC/DC module cannot be by group string
Voltage Cortrol is to maximum power point.Accordingly, it would be desirable to the MPPT module of inverter and the MPPT unit of DC/DC module
Cooperate, just can make group string Maximum Power Output.It practice, the speed of the MPPT module of photovoltaic DC-to-AC converter self
Degree is second level, and the MPPT unit of DC/DC module has only to can realize the maximal power tracing of group string less than 100mS.
Because the output voltage of DC/DC module is well below bus, therefore the power of DC/DC module is less, cost
Low.
Compared with prior art, the beneficial effects of the present invention is: divided by multiple outputs of described DC/DC module
Do not connect with each group string, and then voltage compensation can be carried out respectively for each group string so that each group
String is all operated in its maximum power point, improves the generated energy of photovoltaic generating system.
Actual test result shows, introduces the MPPT compensator of DC/DC module, at northwest large-scale ground photovoltaic electric
In standing, the generated energy of system can promote 1～about 3%, and annual earnings increases up to 80,000/MW, MPPT compensator
0.5～2 year i.e. recovery cost, and the service life of photovoltaic plant is 25 years, the sustainable profit of client is for many years.And make
The longest with the time limit, component aging, pollute otherness the biggest, MPPT compensator effect is the best.Therefore, MPPT mends
Fill and can client arrive huge income.And in distributed photovoltaic generating system, assembly installation position changes greatly,
Block situation difference big, present bigger property difference, sending out of the photovoltaic generating system of use MPPT compensator
Electricity promotes up to 3～5%, and client's income becomes apparent from.
Accompanying drawing explanation
Fig. 1 is the structural representation of an embodiment of the present invention；
Fig. 2 is power and the relation schematic diagram of operating voltage of the group string of an embodiment of the present invention；
Fig. 3 is the structural representation of another kind embodiment of the present invention；
Fig. 4 is the circuit topology figure of the DC/DC module of another kind embodiment of the present invention；
Fig. 5 is the workflow schematic diagram of another embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings, the preferably embodiment of the present invention is described in further detail.
Embodiment 1:
As it is shown in figure 1, this example provides the MPPT compensator of a kind of photovoltaic generating system, including: DC/DC module,
Inverter and at least two group string parallel with one another；One input of described DC/DC module is connected to bus positive pole,
Another input is connected to bus negative pole；One output of described DC/DC module is connected to bus, and another is defeated
Going out end to be in series with respective group of string respectively, described group of string is connected with bus respectively；Described bus positive pole and bus are born
Pole is respectively connecting to inverter；As busbar voltage V and the voltage V corresponding to the maximum power point of any one group stringnNo
Time consistent, the output of described DC/DC module compensates voltage Δ VnPerformance loop to this group string place so that each group
String is operated in the power points of its maximum, wherein, described compensation voltage Δ Vn=V-Vn.Fig. 1 is a knot simplified
Structure schematic diagram, it practice, group string (photovoltaic battery panel) also needs to, through header box and power distribution cabinet, finally access inversion
Among device.
In prior art, owing to property difference, pollution level and the degree of aging of group string are inconsistent, each group of string is
High-power point all there may exist difference.
As in figure 2 it is shown, the voltage corresponding to the maximum power point of first group of string is at V1, the maximum power point of second group of string
Corresponding voltage is at V2, the voltage corresponding to maximum power point of the 3rd group of string is at V3；When all of group of string is the most in parallel
Time together, the operating voltage of each group of string is consistent, if system busbar voltage power supply is at V2Time, then second group of string reaches
Arrive maximum power point, and first group of string and the 3rd group of string have all been not reaching to maximum power point, so may result in whole
The lower power production of photovoltaic generating system.
Group string described in this example is the photovoltaic group string of photovoltaic generating system, and each group string is all in series with DC/DC module；
Described DC/DC module is the DC/DC module with multiple-channel output, and its each road exports all with MPPT function,
MPPT is MPPT maximum power point tracking；Described compensation voltage Δ VnFor each road output of DC/DC module to each connecting
The group string connect carries out the compensation voltage exported, and the group string that this compensation voltage enables to be compensated is operated in maximum work
Under rate point, and n is the natural number of representative group string number.
DC/DC module described in this example by output respectively with group string be in series, and then can for each group go here and there into
Row voltage compensation, such as the voltage V that the maximum power point that busbar voltage is second group string is corresponding2Time, then second group
String has reached maximum power point, but now the maximum power point of first group of string is at V1, then corresponding with first group of string
Output is compensated voltage Δ V by the output of DC/DC module1=V2-V1So that first group of string is operated in maximum power point
v1；And output is compensated voltage Δ V by the output of DC/DC module corresponding to the 3rd group of string3=V2-V3So that the 3rd
Group string is operated in maximum power point V3.By the MPPT compensator of this example, so that every in photovoltaic generating system
One group string is all operated in maximum power point, improves the generated energy of photovoltaic generating system, simultaneously as simply supplement
The portion voltage of portion's packet chain is poor, so, the power of DC/DC module is the least, low cost.
The voltage V corresponding to maximum power point of each group string describednIt is each discrepant, then, compensating it
Before, this example according to measuring each voltage organizing string and power relation in real time and then can obtain the peak power of each group string
Voltage V corresponding to Diann；If power that measurement obtains some group string increases along with the increase of voltage, then explanation should
Group string does not also arrive its maximum power point, now, continues to strengthen the voltage of this group string, the most every time increase by 2～5V, directly
When the power gone here and there to this group reduces along with the increase of voltage, then the voltage corresponding to the maximum power point of this group string is described
Just between this is measured and last time measures；Then, progressively reduce this group is gone here and there and measure this voltage and last time measured
Voltage between gap, until find power to increase to be changed into the increase along with voltage from the increase along with voltage and
The turning point reduced, then the voltage that this turning point is corresponding is exactly this voltage V corresponding to group string maximum power pointn；Therefore,
Obtaining the voltage V corresponding to the maximum power point of each group stringn, it is possible to each road obtaining DC/DC module is defeated
Go out the required compensation voltage Δ V that group string is compensatedn, and then ensure that each group string is all operated in maximum work
Rate point；And for the error of maximum power point, then depend primarily on the voltage difference between two adjacent measurements.Due to this
The mode that example compensates is to carry out independent and man-to-man voltage compensation, therefore, compensatory reactionBu Changfanying speed for each group string
Hurry up, efficiency high, the speed of compensation can reach a millisecond rank, such as 100 milliseconds so that each group string all can
Quickly obtain very effective voltage compensation, really improve the generated energy to photovoltaic generating system and control the mesh of cost
's.
As it is shown in figure 1, an input of DC/DC module described in this example all receives bus positive pole, another input
All receive bus negative pole；One output of described DC/DC module all receives bus negative pole, and another output all connects
In respective group of string, thus DC/DC module concatenation is placed on the bottom of group string, sends out achieving lifting photovoltaic
On the basis of the generated energy of electricity system and control cost, also making wiring simple and clear, clear, Electrical specifications is orderly, is difficult to
Make mistakes.
This example is connected with each group string respectively by multiple outputs of described DC/DC module, and then can pin
Each group string is carried out voltage compensation respectively so that each group string is all operated in maximum power point, improves photovoltaic and sends out
The generated energy of electricity system, meanwhile, the power of described DC/DC module is little, low cost.
Embodiment 2:
As it is shown on figure 3, as different from Example 1, an output of DC/DC module described in this example is connected to mother
Line positive pole, another output of described DC/DC module is connected to each group string positive pole, and the negative pole of described group of string is with female
Line negative pole is connected.
It is to say, described DC/DC module is serially connected in the top of group string, an input of described DC/DC module
End all receives bus positive pole, and another input all receives bus negative pole；One output of described DC/DC module is all
Receiving bus positive pole, another output all receives the top of each group string, is achieving lifting photovoltaic generating system
Generated energy and control on the basis of cost, also make wiring simple and clear, clear, Electrical specifications is orderly, the most error-prone.
Embodiment 3:
On the basis of embodiment 1 or embodiment 2, described in this example, DC/DC module includes that at least two DC/DC is mono-
Unit, the quantity of described DC/DC unit is equal with the quantity of group string, and each group string is all connected with one one to one
DC/DC unit.By the DC/DC module of most basic DC/DC unit member multiple-channel output, each group string is all
Connecting a DC/DC unit one to one, each DC/DC unit is all with MPPT function to often
The MPPT of one group string controls the most flexible effective, with strong points, and efficiency is high.
Described in this example, at least two DC/DC unit is the most in parallel, and an output of described DC/DC unit is equal
Being connected directly to bus, another output then concatenates mutually with each self-corresponding group of string.
Embodiment 4:
As shown in Figure 4, on the basis of embodiment 1 and embodiment 2, DC/DC module described in this example include controller,
First order converter and second level converter, described controller is connected with first order converter and second level converter respectively
Connect.
The quantity of second level converter described in this example is equal with the quantity of group string, and described controller and first order converter divide
It is not connected to organize one to one the performance loop of string by second level converter.Described controller sends driving letter respectively
Number to first order converter and second level converter；Described controller gather respectively first order converter input voltage and
The output voltage of second level converter, and then control the output voltage of each second level converter.
This example is also applied for embodiment 3.
Embodiment 5:
On the basis of embodiment 4, described DC/DC module include MPPT unit, described MPPT unit include with
Lower step: first, the voltage and current of controller collection group string, calculate the output general power of current group string；Secondly,
First order converter and second level converter are started working, and attempt increasing or reducing the output voltage of current group string；Then,
Controller gathers the voltage and current of this group string again, if this group string power increase, the most again to equidirectional adjustment its
Output voltage, is i.e. originally that increase output voltage also continues to increase its output voltage, is originally that minimizing output voltage just continues
Continuous its output voltage of minimizing；If power drop, then attempt adjusting its output voltage to opposite direction, be i.e. originally increase
Output voltage just changes into its output voltage of minimizing, is originally that minimizing output voltage just changes into its output voltage of increase；
Until finding the maximum power point of this group string.So circulate work, the MPPT function of each group string can be realized.
Fig. 5 be the MPPT unit of this example realize workflow diagram, as it is shown in figure 5, after Chu Shihuaing, controller
The voltage V of collection group stringkWith current value Ik, calculate the output general power of current group string；Secondly, first order converter
Start working with second level converter, attempt increasing or reducing the output voltage of current group string, i.e. second level converter is defeated
Go out △ V；Then, controller gathers the voltage V of this group string againk+1With current value Ik+1If this group string power increases,
I.e. Vk+1*Ik+1＞ Vk*Ik, the most again to its output voltage of equidirectional adjustment, i.e. it is originally increase output voltage △ V also
Continue to increase its output voltage △ V, be originally that minimizing output voltage △ V continues to reduce its output voltage △ V；If
Power drop, then attempt adjusting its output voltage to opposite direction, is i.e. originally that increase output voltage △ V just changes into and subtracts
Few its output voltage △ V, is originally that minimizing output voltage △ V just changes into increase its output voltage △ V；Then ought
Front new output voltage/electric current numerical value is assigned to VkAnd Ik, i.e. Vk=Vk+1, Ik=Ik+1, enter next one circulation.So
Circulation work, can realize the MPPT function of each group string, and described k is natural number.
Wherein, described MPPT unit is for realizing the MPPT function to each group string.
Further improvement is that of this example, described inverter also includes MPPT module, for realizing busbar voltage
Adjust；The work period of the MPPT unit of the MPPT module duty ratio DC/DC module of described inverter is long.
Described inverter also includes MPPT module, and the reaction speed of the MPPT module of described inverter requires relatively low,
As long as the speed compensated can reach second rank and the most enough support the Reasonable adjustment of bus.
Above content is that to combine concrete preferred embodiment made for the present invention the most specifically
Bright, it is impossible to assert the present invention be embodied as be confined to these explanations.For technology belonging to the present invention
For the those of ordinary skill in field, without departing from the inventive concept of the premise, it is also possible to if making
Dry simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (8)
1. the MPPT compensator of a photovoltaic generating system, it is characterised in that including: DC/DC module, inversion
Device and at least two group string parallel with one another, each group string is connected to DC/DC module；Described DC/DC module
An input be connected to bus positive pole, another input is connected to bus negative pole；The two of described DC/DC module
Individual output is connected with bus and group string or is connected in series to bus by group respectively respectively；When busbar voltage V is with any
The voltage V corresponding to maximum power point of one group stringnTime inconsistent, this DC/DC module output corresponding to group string is mended
Repay voltage Δ VnSo that each group string is all operated in the power points of its maximum, wherein, described compensation voltage Δ Vn=V-Vn；
Described DC/DC module includes at least two DC/DC unit, the number that the quantity of described DC/DC unit is gone here and there with group
Measuring equal, each group string is all connected with a DC/DC unit one to one；Described DC/DC module also includes control
Device processed, first order converter and second level converter, described controller converts with first order converter and the second level respectively
Device is connected.
The MPPT compensator of photovoltaic generating system the most according to claim 1, it is characterised in that described DC/DC
One output of module is connected to bus negative pole, and another output of described DC/DC module is respectively connecting to each
The negative pole of group string, the positive pole of described group of string is connected with bus positive pole.
The MPPT compensator of photovoltaic generating system the most according to claim 1, it is characterised in that described DC/DC
One output of module is connected to bus positive pole, and another output of described DC/DC module is connected to each group string
Positive pole, the negative pole of described group of string is connected with bus negative pole.
4., according to the MPPT compensator of the photovoltaic generating system described in claims 1 to 3 any one, its feature exists
In, an output of described DC/DC unit is all connected directly to bus, and another output is then self-corresponding with each
Group string concatenates mutually, forms and newly organize string between described DC/DC unit and group string connected in series, phase between each new group of string
The most in parallel.
The MPPT compensator of photovoltaic generating system the most according to claim 1, it is characterised in that described second
The quantity of level converter is equal with the quantity of group string, and described controller and first order converter are converted by the second level respectively
Device is connected to organize one to one the performance loop of string.
The MPPT compensator of photovoltaic generating system the most according to claim 1, it is characterised in that described control
Device sends driving signal respectively to first order converter and second level converter；Described controller gathers the first order respectively and becomes
The input voltage of parallel operation and the output voltage of second level converter, and then control the tune of the output voltage to second level converter
Whole.
The MPPT compensator of photovoltaic generating system the most according to claim 1, it is characterised in that described DC/DC
Module includes that MPPT unit, the course of work of described MPPT unit comprise the following steps: first, controller collection
The voltage and current of group string, calculates the output general power of current group string；Secondly, first order converter and the second level become
Parallel operation is started working, and attempts increasing or reducing the output voltage of current group string；Then, controller gathers this group string again
Voltage and current, if this group string power increase, the most again to its output voltage of equidirectional adjustment；If under power
Fall, then attempt adjusting its output voltage to opposite direction；Until finding the maximum power point of this group string.
The MPPT compensator of the photovoltaic generating system described in 7 the most as requested, it is characterised in that described inverter bag
Include MPPT module, for realizing the adjustment to busbar voltage；The MPPT module duty ratio of described inverter
The work period of the MPPT unit of DC/DC module is long.
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| CN102611355A (en) * | 2012-03-13 | 2012-07-25 | 特变电工新疆新能源股份有限公司 | Photovoltaic array combiner box |
| CN103166239A (en) * | 2011-12-09 | 2013-06-19 | 上海康威特吉能源技术有限公司 | Centralized-distributed mixed novel energy power generation system and maximum power point tracking control method |
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| CN102611355A (en) * | 2012-03-13 | 2012-07-25 | 特变电工新疆新能源股份有限公司 | Photovoltaic array combiner box |
| CN103904992A (en) * | 2014-04-16 | 2014-07-02 | 姜炳芳 | Module string type combiner box |
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Application publication date: 20141119 Assignee: SHENZHEN KSTAR NEW ENERGY Co.,Ltd. Assignor: SHENZHEN KSTAR SCIENCE AND TECHNOLOGY Co.,Ltd. Contract record no.: 2018440020023 Denomination of invention: MPPT (maximum power point tracking) compensator of photovoltaic power generation system Granted publication date: 20160831 License type: Exclusive License Record date: 20180403 |
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