CN104143835B - A kind of photovoltaic generating system - Google Patents
A kind of photovoltaic generating system Download PDFInfo
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- CN104143835B CN104143835B CN201410371288.3A CN201410371288A CN104143835B CN 104143835 B CN104143835 B CN 104143835B CN 201410371288 A CN201410371288 A CN 201410371288A CN 104143835 B CN104143835 B CN 104143835B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/10—Photovoltaic [PV]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The present invention provides a kind of photovoltaic generating system, including: the group string that DC/DC module, inverter, transformator and at least two are parallel with one another；One input of described DC/DC module is connected to bus positive pole, and another input is connected to bus negative pole；Two outfans of described DC/DC module are connected with bus and group string respectively；Described bus positive pole is connected with inverter respectively with bus negative pole, and described inverter is connected with transformator；Wherein, it is superimposed with the voltage of group string that described DC/DC module compensates voltage △ V, described compensation voltage △ V from group string power taking parallel with one another with output, and then raises busbar voltage.The present invention can promote busbar voltage and improve inverter power density, reduces cost, and eliminates two buses and three inverters to the cable of transformator, and megawatt room volume is less.
Description
Technical field
The present invention relates to a kind of electricity generation system, particularly relate to the photovoltaic generating system of a kind of low cost.
Background technology
The photovoltaic generating system of solar energy has been achieved with large-scale application, and large-scale photovoltaic plant generally uses centralized
Photovoltaic generating system, this photovoltaic generating system be typically by two 500kW inverter parallels, then meet a 1MW
Double transformer with split windings network；The group string cell panel being connected with inverter is all connected in parallel, be then passed through header box and
Power distribution cabinet, finally accesses inverter.
The opening voltage of this existing photovoltaic generating system DC side is less than 1000V, maximum power point voltage work quilt
Being limited in 450～650V, therefore inverter output voltage is limited in 315Vac, 500kW inverter maximum input current
For 1100A；If needing to increase further inverter output power, then input current of inverter also can increase further,
Certainly will need to use semiconductor power device and the switching device of more high current capacity, then, whole photovoltaic generating system
Cost will steeply rise.
Summary of the invention
The technical problem to be solved is to need to provide one to improve power density, reduce cost and reduce million
The photovoltaic generating system of the solar energy of tile-roofed house volume.
To this, the present invention provides a kind of photovoltaic generating system, including: DC/DC module, inverter, transformator and extremely
Few two group strings parallel with one another；One input of described DC/DC module is connected to bus positive pole, another input
End is connected to bus negative pole；Two outfans of described DC/DC module are connected with bus and group string respectively；Described mother
Line positive pole is connected with inverter respectively with bus negative pole, and described inverter is connected with transformator；Wherein, described
DC/DC module compensates voltage △ V, described compensation voltage △ V and group string from group string power taking parallel with one another with output
Voltage is superimposed, and then raises busbar voltage.
Described group of string is the photovoltaic group string of photovoltaic generating system, and multiple groups of strings are the most in parallel, each group string all with
Described DC/DC module concatenates mutually, and DC/DC module acts on MPPT function, described DC/DC module
The outside of group string；Described compensation voltage △ V is the magnitude of voltage exported after power taking in group string, is used for raising bus electricity
Pressure.
Two outfans of described DC/DC module are connected with bus and group string respectively, and then can be by for group string
After carrying out power taking, output compensates voltage △ V.
In prior art, photovoltaic generating system is typically by two 500kW inverter parallels, then meets a 1MW
Double transformer with split windings network；The group string cell panel being connected with inverter all and together with, be then passed through header box and joining
Electricity cabinet, finally accesses inverter；And the opening voltage of this existing photovoltaic generating system DC side is less than 1000V,
Maximum power point voltage work is limited in 450～650V, and therefore inverter output voltage is limited in 315Vac, inverter
Output can only achieve 500kW, and this 500kW inverter maximum input current is 1100A；If need into
One step increases inverter output power, then input current of inverter also can increase further, certainly will need to use bigger electricity
The semiconductor power device of current capacity and switching device, then, the cost of whole photovoltaic generating system will steeply rise.
For this problem of prior art, the present invention proposes the photovoltaic generating system of a kind of low cost.
The present invention can compensate voltage △ V by the output of DC/DC module and busbar voltage is promoted to 900Vdc, the most inverse
Become output voltage and reach 630Vac, i.e. the output voltage of inverter is the twice of prior art 315Vac, then identical defeated
Entering under electric current 1100A, the power of inverter output is up to 1000kW；The power device of inverter is all according to 1000V
Specifications design, when inverter input voltage is 900V, owing to maximum input current is still 1100A, i.e. export
Big electric current is not changed in, and therefore major part power device can not do any change, and power density can improve one
Times, i.e. cost at most can reduce half；On this basis, due to the annexation of the present invention, by prior art
Two inverters unite two into one, and eliminate two buses and three inverters to the cable of transformator, and megawatt room volume is more
Little, and, the transformator of the present invention can use less expensive two-winding transformer to realize identical generating effect.
In addition, the cost of the DC/DC module that present invention introduces is relatively low, and this DC/DC module is only inverter cost
1/3rd, therefore, the present invention can significantly reduce the electrical equipment price of photovoltaic generating system.
Further improvement of the present invention is, an outfan of described DC/DC module is connected to bus negative pole, described
Another outfan of DC/DC module is connected to group string negative pole, and the positive pole of described group of string is connected with bus positive pole.
It is to say, an input of described DC/DC module receives bus positive pole, another input receives bus
Negative pole；Bus negative pole received by one outfan of described DC/DC module, and group string negative pole received by another outfan, this
DC/DC module concatenation just can be placed on the bottom of group string by sample, is achieving the generated energy promoting photovoltaic generating system
On the basis of controlling cost, also making wiring simple, clear, Electrical specifications is orderly, the most error-prone.
Further improvement of the present invention is, an outfan of described DC/DC module is connected to bus positive pole, described
Another outfan of DC/DC module is connected to group string positive pole, and the negative pole of described group of string is connected with bus negative pole.
It is to say, an input of described DC/DC module receives bus positive pole, another input receives bus
Negative pole；Bus positive pole received by one outfan of described DC/DC module, and group string positive pole received by another outfan, this
DC/DC module concatenation just can be placed on the top of group string by sample, is achieving the generated energy promoting photovoltaic generating system
On the basis of controlling cost, also making wiring simple, clear, Electrical specifications is orderly, the most error-prone.
Further improvement of the present invention is, described DC/DC module includes that at least two DC/DC parallel with one another is mono-
Unit；One input of described DC/DC unit is connected to bus positive pole, and another input is connected to bus negative pole；
Two outfans of described DC/DC unit are connected with bus and group string respectively.
Further improvement of the present invention is, described DC/DC module includes controller and reduction voltage circuit, described controller
For closing ring controller.
Further improvement of the present invention is, described reduction voltage circuit includes electric capacity Cin, electric capacity C0, diode D, electricity
Sense L and switching tube Q；Described electric capacity Cin is connected with input both positive and negative polarity, and the C pole of described switching tube Q is with Cin's
Positive pole connects, and the E pole of described switching tube Q and the negative electrode of diode D connect；The negative electrode of described diode D respectively with
The E pole of switching tube Q and inductance L connect, and the anode of described diode D is connected with circuit negative pole；Described inductance L
One end is connected with the negative electrode of diode D, and the other end is connected with output head anode；Described electric capacity C0 is positive and negative with outfan
Pole connects.
Further improvement of the present invention is, described controller sends the G pole driving signal to switching tube Q, described control
Device processed is connected to the input of reduction voltage circuit and is connected to the outfan of reduction voltage circuit with Gather and input voltage, described controller
To gather output voltage and/or output electric current.
Further improvement of the present invention is, described DC/DC module includes MPPT unit, described MPPT unit bag
Including following steps: first, controller gathers the voltage and current of bus, calculates the output total work of current all groups of strings
Rate；Secondly, reduction voltage circuit is started working, and attempts increasing or the output voltage of minimizing group string；Then, controller is again
Gather the voltage and current of bus, if the output of bus increases, then to its output voltage of equidirectional adjustment；As
Really the output of this bus declines, then adjust its output voltage to opposite direction；Until finding the maximum power point of system.
Further improvement of the present invention is, described inverter has busbar voltage stabilization function, for by busbar voltage
Stable at a certain magnitude of voltage.Preferably, busbar voltage is stablized at 700 to 1000V by described inverter, especially 900V
When, best results.
Compared with prior art, the beneficial effects of the present invention is: can to most of power device of photovoltaic generating system
Not do any change, and power density can double, i.e. cost at most can reduce half；Basis at this
On, the two of prior art inverters are united two into one, eliminates two buses and three inverters to the line of transformator
Cable, megawatt room volume is less, and, the transformator of the present invention can use less expensive two-winding transformer to realize
Identical generating effect；In addition, the cost of the DC/DC module of introducing is relatively low, and this DC/DC module is only inverter
/ 3rd of cost, therefore, the present invention can significantly reduce the electrical equipment price of photovoltaic generating system.
On the one hand present invention successful implementation in the photovoltaic generating system of 1MW, can reduce 1 inverter and supporting
Header box, the input of power distribution cabinet and the use of cable, the grid-connected transformator of less expensive double winding can be used；The opposing party
Face, the volume-diminished at least 1/3 in megawatt room.And the DC/DC module cost newly put into is only the cost of an inverter
1/3～1/2, therefore, the present invention can greatly reduce the electrical equipment cost of photovoltaic system.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention 2；
Fig. 2 is the structural representation of prior art；
Fig. 3 is the structural representation of the embodiment of the present invention 3；
Fig. 4 is the circuit topology figure of the DC/DC module of the embodiment of the present invention 4；
Fig. 5 is the work process flow chart of the embodiment of the present invention 5.
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 shown in Fig. 1, Fig. 3 and Fig. 5, this example provides a kind of photovoltaic generating system, including: DC/DC module, inverse
Become the group string that device, transformator and at least two are 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；Two outfans of described DC/DC module respectively with bus and group
String is connected；Described bus positive pole is connected with inverter respectively with bus negative pole, and described inverter is connected with transformator
Connect；Wherein, described DC/DC module compensates voltage △ V, described compensation electricity from group string power taking parallel with one another with output
Pressure △ V is superimposed with the voltage of group string, and then raises busbar voltage.
In prior art, as in figure 2 it is shown, photovoltaic generating system is typically by two 500kW inverter parallels, then
The double transformer with split windings meeting a 1MW network；With inverter be connected group string cell panel all and together with, be then passed through
Header box and power distribution cabinet, finally access inverter；And the opening voltage of this existing photovoltaic generating system DC side is little
In 1000V, maximum power point voltage work is limited in 450～650V, and therefore inverter output voltage is limited in
315Vac, the output of inverter can only achieve 500kW, and this 500kW inverter maximum input current is
1100A；If needing to increase further inverter output power, then input current of inverter also can increase further, gesture
Necessarily use semiconductor power device and the switching device of more high current capacity, then, whole photovoltaic generating system
Cost will steeply rise.For this problem of prior art, this example proposes the photovoltaic generating system of a kind of low cost.
This example can compensate voltage △ V by the output of DC/DC module and busbar voltage is promoted to 900Vdc, then inversion
Output voltage reaches 630Vac, i.e. the output voltage of inverter is the twice of prior art 315Vac, then in identical input
Under electric current 1100A, the power of inverter output is up to 1000kW；The power device of inverter is all according to 1000V
Specifications design, when inverter input voltage is 900V, owing to maximum input current is still 1100A, i.e. export
Big electric current is not changed in, and therefore major part power device can not do any change, and power density can improve one
Times, i.e. cost at most can reduce half；On this basis, due to the annexation of this example, by the two of prior art
Individual inverter unites two into one, and eliminates two buses and three inverters to the cable of transformator, and megawatt room volume is less,
Further, the transformator of this example can use less expensive two-winding transformer to realize identical generating effect.
In addition, the cost of the DC/DC module that this example introduces is relatively low, and this DC/DC module is only the three of inverter cost
/ mono-, therefore, this example can significantly reduce the electrical equipment price of photovoltaic generating system.
The technical term of this example is explained as follows: MPPT is MPPT maximum power point tracking；In large-sized photovoltaic power station, generally with
1MW is unit, independent the most grid-connected, a megawatt room be in 1MW photovoltaic system installation inverter, power distribution cabinet, communication counter,
The civil engineering room of watch-dog or container, its output is 1MW；Double transformer with split windings: former limit is two independent winding,
Secondary is the transformator of a winding；Two-winding transformer: the transformator of former secondary all only one of which windings.
Embodiment 2:
As it is shown in figure 1, on the basis of embodiment 1, an outfan of DC/DC module described in this example is connected to mother
Line negative pole, another outfan of described DC/DC module is connected to group string negative pole, and the positive pole of described group of string is with bus just
Pole is connected.
It is to say, an input of described DC/DC module receives bus positive pole, another input receives bus
Negative pole；Bus negative pole received by one outfan of described DC/DC module, and group string negative pole received by another outfan, this
DC/DC module concatenation just can be placed on the bottom of group string by sample, is achieving the generated energy promoting photovoltaic generating system
On the basis of controlling cost, also making wiring simple, clear, Electrical specifications is orderly, the most error-prone.
Embodiment 3:
As it is shown on figure 3, on the basis of embodiment 1, an outfan of DC/DC module described in this example is connected to mother
Line positive pole, another outfan of described DC/DC module is connected to group string positive pole, and the negative pole of described group of string is born with bus
Pole is connected.
It is to say, an input of described DC/DC module receives bus positive pole, another input receives bus
Negative pole；Bus positive pole received by one outfan of described DC/DC module, and group string positive pole received by another outfan, this
DC/DC module concatenation just can be placed on the top of group string by sample, is achieving the generated energy promoting photovoltaic generating system
On the basis of controlling cost, also making wiring simple, clear, Electrical specifications is orderly, the most error-prone.
Embodiment 4:
As shown in Figure 4, in embodiment 1 to embodiment 3 on the basis of any one embodiment, DC/DC described in this example
Module includes controller and reduction voltage circuit, and described controller is for closing ring controller.
Reduction voltage circuit described in this example includes electric capacity Cin, electric capacity C0, diode D, inductance L and switching tube Q；Described
Electric capacity Cin is connected with input both positive and negative polarity, and the C pole of described switching tube Q is connected with the positive pole of Cin, described switching tube
The E pole of Q and the negative electrode of diode D connect；The negative electrode of described diode D respectively with E pole and the electricity of switching tube Q
Sense L connects, and the anode of described diode D is connected with circuit negative pole；Described inductance L one end and the negative electrode of diode D
Connecting, the other end is connected with output head anode；Described electric capacity C0 is connected with output positive and negative charge.
Controller described in this example sends the G pole driving signal to switching tube Q, and described controller is connected to reduction voltage circuit
Input is with Gather and input voltage, and described controller is connected to the outfan of reduction voltage circuit to gather output voltage and output
Electric current.
Embodiment 5:
On the basis of embodiment 4, DC/DC module described in this example includes MPPT unit, described MPPT unit bag
Including following steps: first, controller gathers the voltage and current of bus, calculates the output general power of current bus；
Secondly, reduction voltage circuit is started working, and attempts increasing or reducing the output voltage of all groups of strings；Then, controller is again
Gather the voltage and current of bus, if the output of bus increases, then to its output voltage of equidirectional adjustment, i.e.
Script is that the output voltage of increase group string continues to increase its output voltage, is that the output voltage of minimizing group string just continues originally
Continuous its output voltage of minimizing；If the output of group string declines, then adjust its output voltage to opposite direction, i.e. originally
It is that the output voltage of increase group string just changes into its output voltage of minimizing, is originally that the output voltage of minimizing group string just changes
For increasing its output voltage；Until finding its maximum power point.So circulate work, each group string can be realized
MPPT function.
Fig. 5 be the MPPT unit of this example realize workflow diagram, as it is shown in figure 5, after Chu Shihuaing, controller
Gather the voltage V of buskWith current value Ik, calculate the output general power of current group string；Reduction voltage circuit is started working,
Attempt increasing or reducing the output voltage of all groups of strings；Then, controller gathers the voltage V of bus againk+1And electric current
Value Ik+1If bus 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 that increase output voltage △ V also continues to increase its output voltage △ V, is originally that minimizing output voltage △ V just continues
Continuous minimizing its output voltage △ V；If power drop, then attempt adjusting its output voltage to opposite direction, be i.e. originally increasing
Big output voltage △ V just changes into minimizing its output voltage △ V, is originally that minimizing output voltage △ V just changes into increase
Its output voltage △ V；Then the newest output voltage/electric current numerical value is assigned to VkAnd Ik, i.e. Vk=Vk+1, Ik=Ik+1,
Enter next one circulation.So circulating the MPPT function of work, i.e. feasible system, described k is natural number.
Further improvement of the present invention is, described inverter has busbar voltage stabilization function, and inverter passes through self
Control system, by stable for busbar voltage at some numerical value, and then assists DC/DC module to realize MPPT function；This
Inverter foundation output AC voltage value 270Vac or 315Vac described in example, and then by busbar voltage stability contorting 800
A certain numerical value between 1000V, such as 900V.
Above content is to combine concrete preferred implementation further description made for the present invention, it is impossible to assert
Being embodied as of the present invention is confined to these explanations.For general technical staff of the technical field of the invention,
Without departing from the inventive concept of the premise, it is also possible to make some simple deduction or replace, should be all considered as belonging to this
The protection domain of invention.
Claims (5)
1. a photovoltaic generating system, it is characterised in that including: DC/DC module, inverter, transformator and at least two are mutual
Group string in parallel；One input of described DC/DC module is connected to bus positive pole, and another input is connected to bus and bears
Pole；Two outfans of described DC/DC module are connected with bus and group string respectively；Described bus positive pole and bus negative pole divide
Not being connected with inverter, described inverter is connected with transformator；Wherein, described DC/DC module is from group parallel with one another
It is superimposed with the voltage of group string that string power taking compensates voltage △ V, described compensation voltage △ V with output, and then raises busbar voltage；
Described DC/DC module includes controller and reduction voltage circuit, and described controller is for closing ring controller；Described reduction voltage circuit bag
Include electric capacity Cin, electric capacity C0, diode D, inductance L and switching tube Q；Described electric capacity Cin is connected with input both positive and negative polarity,
The C pole of described switching tube Q is connected with the positive pole of Cin, and the E pole of described switching tube Q and the negative electrode of diode D connect；Institute
The negative electrode stating diode D is connected with E pole and the inductance L of switching tube Q respectively, the anode of described diode D and circuit negative pole
Connect；Described inductance L one end is connected with the negative electrode of diode D, and the other end is connected with output head anode；Described electric capacity C0 with
Output positive and negative charge connects；
Wherein, an outfan of described DC/DC module is connected to bus negative pole, and another outfan of described DC/DC module is even
Being connected to group string negative pole, the positive pole of described group of string is connected with bus positive pole；Or, an outfan of described DC/DC module is even
Being connected to bus positive pole, another outfan of described DC/DC module is connected to group string positive pole, the negative pole of described group of string and bus
Negative pole is connected.
Photovoltaic generating system the most according to claim 1, it is characterised in that described DC/DC module includes that at least two is mutual
DC/DC unit in parallel.
Photovoltaic generating system the most according to claim 1, it is characterised in that described controller sends and drives signal to switching tube
The G pole of Q, described controller is connected to the input of reduction voltage circuit and is connected to blood pressure lowering with Gather and input voltage, described controller
The outfan of circuit is to gather output voltage and/or output electric current.
Photovoltaic generating system the most according to claim 1, it is characterised in that described DC/DC module includes MPPT unit,
Described MPPT unit comprises the following steps: first, the voltage and current of controller collection group string, calculates the defeated of current group string
Go out general power；Secondly, reduction voltage circuit is started working, and attempts increasing or reducing the output voltage of this group string；Then, controller is again
The voltage and current of this group string of secondary collection, if the output of this group string increases, then to its output voltage of equidirectional adjustment；As
Really the output of this group string declines, then adjust its output voltage to opposite direction；Until finding the maximum power point of each group string.
Photovoltaic generating system the most according to claim 4, it is characterised in that described inverter includes busbar voltage stabilization function,
For busbar voltage is stablized at a certain magnitude of voltage.
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| CN205430161U (en) * | 2015-07-01 | 2016-08-03 | 中民新能投资有限公司 | Efficient photovoltaic power generation system |
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| GB2492342A (en) * | 2011-06-27 | 2013-01-02 | Fei Kong | Power converting apparatus connecting AC source and DC source with load. |
| CN102611355B (en) * | 2012-03-13 | 2015-09-16 | 特变电工新疆新能源股份有限公司 | A kind of photovoltaic array conflux box |
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