CN106026903A - Power optimization system and optimization method for photovoltaic assembly string - Google Patents
Power optimization system and optimization method for photovoltaic assembly string Download PDFInfo
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- CN106026903A CN106026903A CN201610499841.0A CN201610499841A CN106026903A CN 106026903 A CN106026903 A CN 106026903A CN 201610499841 A CN201610499841 A CN 201610499841A CN 106026903 A CN106026903 A CN 106026903A
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000005457 optimization Methods 0.000 title claims abstract description 16
- 230000000295 complement effect Effects 0.000 claims description 9
- 239000003990 capacitor Substances 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 5
- 239000004065 semiconductor Substances 0.000 claims description 5
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 230000000712 assembly Effects 0.000 abstract 5
- 238000000429 assembly Methods 0.000 abstract 5
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/32—Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
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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
Abstract
The invention discloses a power optimization system for a photovoltaic assembly string in a photovoltaic system field. The system comprises a control system and a main circuit. The main circuit is formed by a plurality of groups of optimization assemblies with the same structures. The optimization assemblies include main power module modules; the input terminals of the main power modules are connected between an input bus of an inverter and the ground; and the output terminals of the main power modules are connected with input terminals of slave power modules. The slave power modules manage photovoltaic assemblies; and the output terminal of each slave power module is connected between positive output terminals of the photovoltaic assemblies and a bus of the inverter. The control system controls the main power modules to output low-voltage direct-current voltages to keep output power balancing. The control system controls the slave power modules manage to adjust the output voltage values in real time according the direct-current bus voltage of the inverter and the calculated maximum power point voltage of the photovoltaic assemblies, so that the maximum power output point of each photovoltaic string under the system constraint and the environment constraint is kept. Therefore, the energy utilization rate of the photovoltaic string is improved. The system and method can be applied to photovoltaic control.
Description
Technical field
The present invention relates to a kind of photovoltaic control system, optimize system particularly to a kind of photovoltaic string.
Background technology
In photovoltaic generation is applied, there is the power mismatch phenomenon of many levels, first photovoltaic battery panel itself exist certain
Tolerance, cause the steady-state operation point of every piece of photovoltaic panel Maximum Power Output to have difference；When multiple photovoltaic cells connection bunchiness is defeated
Go out when powering to photovoltaic DC-to-AC converter, due to information summary effects such as parameter coupling, uneven illumination, shade cover, cause power to lose
Joining phenomenon more serious, the utilization rate of photovoltaic declines further.
Summary of the invention
It is an object of the invention to provide a kind of photovoltaic module string power optimized system, eliminate mismatch phenomenon, improve solar energy
Utilization rate.
The object of the present invention is achieved like this: a kind of photovoltaic module string power optimized system, including control system and master
Circuit, described main circuit is made up of the optimization component organizing structure identical more, and described optimization component includes:
Main power model, in order to input the energy of coupling photovoltaic module to from power model, the energy that balance exports from power model
Amount；
From power model, the voltage x current sent according to photovoltaic module controls the output voltage of himself, to keep photovoltaic module
Send current maximum steady state power；
Photovoltaic module, is in series by multiple photovoltaic panel, forms photovoltaic string；
The input of main power model is connected between inverter inlet highway and ground；The outfan of main power model with from power mould
The input of block is connected；Managing photovoltaic module from power model, each outfan from power model is connected to photovoltaic module
Between positive output end and inverter bus；
Described control system controls main power model output low-voltage dc voltage, keeps output balance；Described control system
Control to adjust in real time according to inverter DC bus-bar voltage and the photovoltaic module maximum power point voltage calculated from power model
Its output voltage values, keeps the maximum power point (mpp) that each photovoltaic string is under system restriction and environmental constraints.
As the further restriction of the present invention, described main power model is isolation type bidirectional DC-to-DC converter, defeated
Enter for inverter DC bus-bar voltage, be output as low-voltage DC；Its main circuit include the first power IGBT switching tube Q1, second
Power IGBT switching tube Q2, the 3rd power IGBT switching tube Q3, the 4th power IGBT switching tube Q4, power transformer T, the 5th merit
Rate metal-oxide-semiconductor Q5, the 6th power MOS pipe Q6, the 7th power MOS pipe Q7, the 8th power MOS pipe Q8 and the first bus capacitor C1；
The colelctor electrode of the first power IGBT switching tube Q1, the colelctor electrode of the 3rd power IGBT switching tube Q3 and inverter inlet highway phase
Even, the source electrode of the first power IGBT switching tube and the colelctor electrode of the second power IGBT switching tube Q2 are connected, and the 3rd power IGBT opens
The colelctor electrode closing the source electrode of pipe Q3 and the 4th power IGBT switching tube Q4 is connected, the source electrode of the second power IGBT switching tube Q2, the
The source ground of four power IGBT switching tube Q4, the former limit of power transformer T one terminates the first power IGBT pipe Q1 and the second power
Electrode points A between IGBT pipe Q2, the electrode points between another termination the 3rd power IGBT pipe Q3 and the 4th power IGBT pipe Q4
B, one end of power transformer T secondary is connected with electrode points C, and the other end is connected with electrode points D, and electrode points C is positioned at the 5th
Between power MOS pipe Q5 source electrode and the 6th power MOS pipe Q6 drain electrode, electrode points D is positioned at the 7th power MOS pipe Q7 source electrode and the 8th
Between power MOS pipe Q8 drain electrode, the drain electrode of the 5th power MOS switch tube Q5, the drain electrode of the 7th power MOS switch tube Q7 and output
Bus positive pole BUSP is connected, and the source electrode of the 5th power MOS switch tube Q5 and the drain electrode of the 6th power MOS switch tube Q6 are connected, the
The source electrode of seven power MOS switch tube Q7 and the drain electrode of the 8th power MOS switch tube Q8 are connected, the 6th power MOS switch tube Q6's
Source electrode, the source electrode of the 8th power MOS switch tube Q8 are connected with output bus negative pole BUSN, and the first bus capacitor C1 is connected across output
Bus positive pole BUSP and output bus negative pole BUSN two ends.
As the further restriction of the present invention, the described main circuit from power model includes the first inductance LM1, the 9th power
Metal-oxide-semiconductor Q9, the second inductance LM2, the 3rd electric capacity C3, the tenth power MOS pipe Q10, the second electric capacity C2；9th power MOS pipe Q9's
Drain electrode connects bus positive pole BUSP, the source electrode of the 9th power MOS pipe Q9 and one end of the 3rd electric capacity C3 and is connected, the 3rd electric capacity C3's
The drain electrode of the other end and the tenth power MOS pipe Q10 is connected, and the source electrode of the second power MOS pipe meets bus negative pole BUSN and is connected,
The one termination bus positive pole BUSP of the first inductance LM1, the other end of the first inductance LM1 and the drain electrode phase of the tenth power MOS pipe Q10
Connecting, one end of the second inductance LM2 is connected with the source electrode of the 9th power MOS pipe Q9, another termination inversion of the second inductance LM2
Device inlet highway, bus negative pole BUSN is connected with the outfan of photovoltaic module, a termination inverter input mother of the second electric capacity C2
Line, another termination bus negative pole BUSN of the second electric capacity C2.
A kind of photovoltaic module string power optimization method, including main power model control method with from power model controlling party
Method；Described main power model control method is: regulation the first power IGBT switching tube Q1 and the 4th power IGBT switch before controlling
The same logic of pipe Q4, the first power IGBT switching tube Q1 and the second power IGBT switching tube Q2 logical complement, the 3rd power IGBT opens
Pass pipe Q3 and the 4th power IGBT switching tube Q4 logical complement, the 5th power MOS pipe Q5 and the 8th same logic of power MOS pipe Q8,
5th power MOS pipe Q5 and the 6th power MOS pipe Q6 logical complement, the 7th power MOS pipe Q7 and the 8th power MOS pipe Q8 logic
Complementation, directly there is phase contrast phase in the first power IGBT switching tube Q1 and the 5th power MOS pipe Q5；During control, by primary module
Output voltagev BUSAfter sampling and setting valueV * BUSCompare, carry out closed loop control, the energy of coupling photovoltaic string is extracted out or sent back to
Inverter dc bus, closed loop control process middle controller output violent change is between [-90,90]；
Described from the control method of power model it is: regulate the 9th power MOS pipe Q9 and the tenth power MOS pipe Q10 before Kong Zhiing and patrol
Collect complementation, during control, measure the voltage and current of photovoltaic string, calculate this light according to conventional maximum power point tracking tracing algorithm
The steady state voltage point that volt string should run, calculates the voltage of insertion further according to real-time inverter busbar voltage, by closed loop control profit
Calculate dutycycle d of the 9th power MOS pipe Q9 with voltage controller, thus control from power model Maximum Power Output voltage.
Compared with prior art, the beneficial effects of the present invention is: utilize RF power converter technique by a positive and negative company
Continuous controllable voltage source is inserted in photovoltaic module so that often the photovoltaic module of group parallel connection generating can work in peak power output
Point；Controllable voltage source voltage owing to inserting is low, so the electrical power of the process of principal and subordinate's power model is the lowest, i.e. proposes in invention
Optimization system relative to existing scheme loss the least.The present invention can be used in photovoltaic generation.
Accompanying drawing explanation
Fig. 1 is present system structural representation.
Fig. 2 is main power module circuit figure in the present invention.
Fig. 3 is from power module circuit figure in the present invention.
Fig. 4 is main power model control principle drawing in the present invention.
Fig. 5 is from power model control principle drawing in the present invention.
Detailed description of the invention
A kind of photovoltaic module string power optimized system as Figure 1-3, including control system and main circuit, described main electricity
The optimization component composition that route many groups structure is identical, described optimization component includes:
Main power model PM, in order to input coupling photovoltaic module energy give from power model SM, balance defeated from power model SM
The energy gone out, described main power model PM is isolation type bidirectional DC-to-DC converter, inputs as inverter dc bus electricity
Pressure, is output as low-voltage DC；Its main circuit include the first power IGBT switching tube Q1, the second power IGBT switching tube Q2,
Three power IGBT switching tube Q3, the 4th power IGBT switching tube Q4, power transformer T, the 5th power MOS pipe Q5, the 6th power
Metal-oxide-semiconductor Q6, the 7th power MOS pipe Q7, the 8th power MOS pipe Q8 and the first bus capacitor C1；First power IGBT switching tube
The colelctor electrode of Q1, the colelctor electrode of the 3rd power IGBT switching tube Q3 are connected with inverter inlet highway, the first power IGBT switch
The source electrode of pipe and the colelctor electrode of the second power IGBT switching tube Q2 are connected, the source electrode of the 3rd power IGBT switching tube Q3 and the 4th merit
The colelctor electrode of rate IGBT switching tube Q4 is connected, the source electrode of the second power IGBT switching tube Q2, the 4th power IGBT switching tube Q4
Source ground, the former limit of power transformer T one terminates the electrode points between the first power IGBT pipe Q1 and the second power IGBT pipe Q2
A, electrode points B between another termination the 3rd power IGBT pipe Q3 and the 4th power IGBT pipe Q4, the one of power transformer T secondary
End is connected with electrode points C, and the other end is connected with electrode points D, and electrode points C is positioned at the 5th power MOS pipe Q5 source electrode and the 6th
Between power MOS pipe Q6 drain electrode, electrode points D between the 7th power MOS pipe Q7 source electrode and the 8th power MOS pipe Q8 drain,
The drain electrode of the 5th power MOS switch tube Q5, the drain electrode of the 7th power MOS switch tube Q7 are connected with output bus positive pole BUSP, the
The source electrode of five power MOS switch tube Q5 and the drain electrode of the 6th power MOS switch tube Q6 are connected, the 7th power MOS switch tube Q7's
The drain electrode of source electrode and the 8th power MOS switch tube Q8 is connected, the source electrode of the 6th power MOS switch tube Q6, the 8th power MOS switch
The source electrode of pipe Q8 is connected with output bus negative pole BUSN, and the first bus capacitor C1 is connected across output bus positive pole BUSP and output mother
Line negative pole BUSN two ends；
From power model SM, the voltage x current sent according to photovoltaic module controls the output voltage of himself, to keep photovoltaic group
Part sends current maximum steady state power, and the described main circuit from power model SM includes the first inductance LM1, the 9th power MOS pipe
Q9, the second inductance LM2, the 3rd electric capacity C3, the tenth power MOS pipe Q10, the second electric capacity C2；The drain electrode of the 9th power MOS pipe Q9 connects
Bus positive pole BUSP, the source electrode of the 9th power MOS pipe Q9 and one end of the 3rd electric capacity C3 are connected, the other end of the 3rd electric capacity C3
Drain electrode with the tenth power MOS pipe Q10 is connected, and the source electrode of the second power MOS pipe meets bus negative pole BUSN and is connected, the first electricity
The one of sense LM1 terminates bus positive pole BUSP, and the other end of the first inductance LM1 and the drain electrode of the tenth power MOS pipe Q10 are connected,
One end of second inductance LM2 is connected with the source electrode of the 9th power MOS pipe Q9, and another termination inverter of the second inductance LM2 is defeated
Entering bus, bus negative pole BUSN is connected with the outfan of photovoltaic module, a termination inverter inlet highway of the second electric capacity C2, the
Another termination bus negative pole BUSN of two electric capacity C2；
Photovoltaic module, is in series by multiple photovoltaic panel, forms photovoltaic string PV；
The input of main power model PM is connected between inverter inlet highway P and ground GND；The outfan of main power model PM with
It is connected from the input of power model SM；Main power model PM outfan bus the most extremely BUSP, bus negative pole are BUSN, from merit
Rate module SM management photovoltaic module, each outfan from power model SM is connected to positive output end and the inverter of photovoltaic module
Between bus, meeting inverter inlet highway P from one end StringP of power model SM outfan, other end StringN connects photovoltaic
String PV output but；
Control system controls main power model PM and exports low-voltage dc voltage, keeps output balance；Described control system control
Make and adjust in real time according to inverter DC bus-bar voltage and the photovoltaic module maximum power point voltage calculated from power model SM
Its output voltage values, keeps each photovoltaic string PV to be in the maximum power point (mpp) under system restriction and environmental constraints.
In the present invention, control system mainly realizes two functions during controlling, and 1) control main power model PM outfan
The energy balance between BUSPi and BUSNi；2) control from power model SM's according to the voltage x current that often string photovoltaic cell sends
Output voltage, keeps often string photovoltaic cell to send current maximum steady state power；Above-mentioned two functions are real by following control method
Existing.
A kind of photovoltaic module string power optimization method as illustrated in figures 4-5, including main power model PM control method and from
Power model SM control method；Described main power model PM control method is: regulation the first power IGBT switching tube Q1 before controlling
With the 4th power IGBT same logic of switching tube Q4, the first power IGBT switching tube Q1 and the second power IGBT switching tube Q2 logic mutual
Mend, the 3rd power IGBT switching tube Q3 and the 4th power IGBT switching tube Q4 logical complement, the 5th power MOS pipe Q5 and the 8th merit
The same logic of rate metal-oxide-semiconductor Q8, the 5th power MOS pipe Q5 and the 6th power MOS pipe Q6 logical complement, the 7th power MOS pipe Q7 and
Eight power MOS pipe Q8 logical complements, directly there is phase contrast in the first power IGBT switching tube Q1 and the 5th power MOS pipe Q5
phase；During control, by primary module output voltagev BUSAfter sampling and setting valueV * BUSCompare, carry out closed loop control, light will be mated
Volt string PV energy extract out or send inverter dc bus back to, closed loop control process middle controller output violent change [-90,90] it
Between；
The described control method from power model SM is: regulate the 9th power MOS pipe Q9 and the tenth power MOS pipe Q10 before Kong Zhiing
Logical complement, during control, measures the voltage and current of photovoltaic string PV, calculates this light according to conventional maximum power point tracking algorithm
The steady state voltage point that volt string PV should run, further according to real-time inverter busbar voltage VP-GNDCalculate the voltage of insertion, pass through closed loop
Control dutycycle d utilizing voltage controller to calculate the 9th power MOS pipe Q9, thus control from power model SM output voltage,
Voltage between i.e. StringP and StringN.After this voltage inserts between photovoltaic module and inverter dc bus, natural
The terminal voltage of forcibly changing photovoltaic module, can adjust the operating point of photovoltaic module to optimal working point, under output current environment
Maximum electric power.
The invention is not limited in above-described embodiment, on the basis of technical scheme disclosed by the invention, the skill of this area
Art personnel are according to disclosed technology contents, it is not necessary to some of which technical characteristic just can be made one by performing creative labour
A little replacements and deformation, these are replaced and deformation is the most within the scope of the present invention.
Claims (4)
1. a photovoltaic module string power optimized system, it is characterised in that include control system and main circuit, described main circuit by
The optimization component composition that many group structures are identical, described optimization component includes:
Main power model, it is provided that or absorbed power, in order to mate the peak power output of photovoltaic module；
From power model, the voltage x current sent according to photovoltaic module controls the output voltage of himself, to keep photovoltaic module
Send current maximum steady state power；
Photovoltaic module, is in series by multiple photovoltaic panel, forms photovoltaic string；
The input of main power model is connected between inverter inlet highway and ground；The outfan of main power model with from power mould
The input of block is connected；Managing photovoltaic module from power model, each outfan from power model is connected to photovoltaic module
Between positive output end and inverter bus；
Described control system controls main power model output low-voltage dc voltage, keeps output balance；Described control system
Control to adjust in real time according to inverter DC bus-bar voltage and the photovoltaic module maximum power point voltage calculated from power model
Its output voltage values, keeps the maximum power point (mpp) that each photovoltaic string is under system restriction and environmental constraints.
A kind of photovoltaic module string power optimized system the most according to claim 1, it is characterised in that described main power model
For isolation type bidirectional DC-to-DC converter, input as inverter DC bus-bar voltage, be output as low-voltage DC；Its main electricity
Road includes the first power IGBT switching tube Q1, the second power IGBT switching tube Q2, the 3rd power IGBT switching tube Q3, the 4th power
IGBT switching tube Q4, power transformer T, the 5th power MOS pipe Q5, the 6th power MOS pipe Q6, the 7th power MOS pipe Q7, the 8th
Power MOS pipe Q8 and the first bus capacitor C1；The colelctor electrode of the first power IGBT switching tube Q1, the 3rd power IGBT switching tube
The colelctor electrode of Q3 is connected with inverter inlet highway, the source electrode of the first power IGBT switching tube and the second power IGBT switching tube Q2
Colelctor electrode be connected, the source electrode of the 3rd power IGBT switching tube Q3 and the colelctor electrode of the 4th power IGBT switching tube Q4 are connected, the
The source electrode of two power IGBT switching tube Q2, the source ground of the 4th power IGBT switching tube Q4, the former limit of power transformer T one terminates
Electrode points A between first power IGBT pipe Q1 and the second power IGBT pipe Q2, another termination the 3rd power IGBT pipe Q3 and the
Electrode points B between four power IGBT pipe Q4, one end of power transformer T secondary is connected with electrode points C, the other end and electrode
Point D is connected, and electrode points C is between the 5th power MOS pipe Q5 source electrode and the 6th power MOS pipe Q6 drain, and electrode points D is positioned at
Between 7th power MOS pipe Q7 source electrode and the 8th power MOS pipe Q8 drain electrode, the drain electrode of the 5th power MOS switch tube Q5, the 7th merit
The drain electrode of rate MOS switch pipe Q7 is connected with output bus positive pole BUSP, the source electrode of the 5th power MOS switch tube Q5 and the 6th power
The drain electrode of MOS switch pipe Q6 is connected, the source electrode of the 7th power MOS switch tube Q7 and the drain electrode phase of the 8th power MOS switch tube Q8
Even, the source electrode of the 6th power MOS switch tube Q6, the source electrode of the 8th power MOS switch tube Q8 are connected with output bus negative pole BUSN,
First bus capacitor C1 is connected across output bus positive pole BUSP and output bus negative pole BUSN two ends.
A kind of photovoltaic module string power optimized system the most according to claim 1 and 2, it is characterised in that described from power
The main circuit of module includes the first inductance LM1, the 9th power MOS pipe Q9, the second inductance LM2, the 3rd electric capacity C3, the tenth power
Metal-oxide-semiconductor Q10, the second electric capacity C2；The drain electrode of the 9th power MOS pipe Q9 connects bus positive pole BUSP, the source electrode of the 9th power MOS pipe Q9
Being connected with one end of the 3rd electric capacity C3, the other end of the 3rd electric capacity C3 and the drain electrode of the tenth power MOS pipe Q10 are connected, the
The source electrode of two power MOS pipes meets bus negative pole BUSN and is connected, a termination bus positive pole BUSP of the first inductance LM1, the first electricity
The other end of sense LM1 and the drain electrode of the tenth power MOS pipe Q10 are connected, one end of the second inductance LM2 and the 9th power MOS pipe
The source electrode of Q9 is connected, and another termination inverter inlet highway of the second inductance LM2, bus negative pole BUSN is defeated with photovoltaic module
Go out end to be connected, a termination inverter inlet highway of the second electric capacity C2, another termination bus negative pole BUSN of the second electric capacity C2.
4. a photovoltaic module string power optimization method, it is characterised in that include main power model control method and from power mould
Block control method；
Described main power model control method is: regulation the first power IGBT switching tube Q1 and the 4th power IGBT switch before controlling
The same logic of pipe Q4, the first power IGBT switching tube Q1 and the second power IGBT switching tube Q2 logical complement, the 3rd power IGBT opens
Pass pipe Q3 and the 4th power IGBT switching tube Q4 logical complement, the 5th power MOS pipe Q5 and the 8th same logic of power MOS pipe Q8,
5th power MOS pipe Q5 and the 6th power MOS pipe Q6 logical complement, the 7th power MOS pipe Q7 and the 8th power MOS pipe Q8 logic
Complementation, directly there is phase contrast phase in the first power IGBT switching tube Q1 and the 5th power MOS pipe Q5；During control, by primary module
Output voltagev BUSAfter sampling and setting valueV * BUSCompare, carry out closed loop control, the energy of coupling photovoltaic string is extracted out or sent back to
Inverter dc bus, closed loop control process middle controller output violent change is between [-90,90]；
Described from the control method of power model it is: regulate the 9th power MOS pipe Q9 and the tenth power MOS pipe Q10 before Kong Zhiing and patrol
Collect complementation, during control, measure the voltage and current of photovoltaic string, calculate this light according to conventional maximum power point tracking tracing algorithm
The steady state voltage point that volt string should run, calculates the voltage of insertion further according to real-time inverter busbar voltage, by closed loop control profit
Calculate dutycycle d of the 9th power MOS pipe Q9 with voltage controller, thus control from power model Maximum Power Output voltage.
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| CN204539077U (en) * | 2015-04-07 | 2015-08-05 | 广东技术师范学院 | A kind of Intelligent photovoltaic Miniature inverter |
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