CN105826943A - Distributed inversion system and starting method thereof - Google Patents
Distributed inversion system and starting method thereof Download PDFInfo
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- CN105826943A CN105826943A CN201610150108.8A CN201610150108A CN105826943A CN 105826943 A CN105826943 A CN 105826943A CN 201610150108 A CN201610150108 A CN 201610150108A CN 105826943 A CN105826943 A CN 105826943A
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- H02J3/383—
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
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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 invention discloses a distributed inversion system and a starting method thereof. An inverter of the distributed inversion system determines whether the system satisfies a preset starting condition; when the distributed inversion system satisfies the preset starting condition, the inverter communicates with N power optimizers of independent control, so that all the power optimizers are notified to start in the output voltage source mode; when the inverter determines that the voltage of a DC bus satisfies a first preset soft start condition, the inverter is started softly and establishes an inversion voltage; and when the inverter determines that the inversion voltage satisfies a second preset soft start condition, an AC contactor is closed. The first and second preset soft start conditions are determined to ensure that the voltage between the two ends of the inverter satisfies the soft start conditions before the inverter is started, and solve the problem that impact current of AC/DC capacitors is too high when the inverter is started under the condition that the voltage of the DC bus is too low.
Description
Technical field
The present invention relates to collecting and distributing type inversion system technical field, particularly to a kind of collecting and distributing type inversion system and startup method thereof.
Background technology
In field of photovoltaic power generation, collecting and distributing type inversion system combines group string data and the advantage of centralized inverter, and the generated energy in distributed power station is obviously improved effect.Its system is constituted as it is shown in figure 1, the square formation of 1MW includes boost power optimization device that 1 1MW centralized inverter, 1 booster transformer being connected with electrical network, N platform control independently of one another and multiple cell panel, and N is positive integer.
In the system shown in figure 1, the comparison that the DC bus-bar voltage (such as 820V) of inverter and ac grid voltage (such as 540V) are often arranged is high.Carry out the startup of inverter in this case, when DC bus-bar voltage is relatively low, the A.C. contactor of adhesive inverter, owing to ac grid voltage is higher, will produce to ac filter electric capacity and DC filter capacitor the biggest dash current, its peak value often reaches kilo-ampere, affects the service life of capacitor.
Summary of the invention
The present invention provides a kind of collecting and distributing type inversion system and startup method thereof, problem bigger to the dash current of capacitor during to solve inverter startup in prior art.
For realizing described purpose, the technical scheme that the application provides is as follows:
A kind of startup method of collecting and distributing type inversion system, is applied to collecting and distributing type inversion system, and described collecting and distributing type inversion system includes: inverter and outfan are parallel to N number of power optimization device of described inverter input terminal；Wherein, described inverter and N number of power optimization device all include independent controller, and N is positive integer；The startup method of described collecting and distributing type inversion system includes:
Described inverter judges whether described collecting and distributing type inversion system meets and presets entry condition；
When described collecting and distributing type inversion system meets described default entry condition, by communication modes, described inverter notifies that described N number of power optimization device all starts with output voltage source module；
Described inverter judges whether DC bus-bar voltage meets first and preset and soft open condition；
When described DC bus-bar voltage meet described first preset soft open condition time, described inverter is soft to be opened and sets up inverter voltage；
Described inverter judges whether described inverter voltage meets second and preset and soft open condition；
When described inverter voltage meet described second preset soft open condition time, described inverter control A.C. contactor adhesive.
Preferably, described inverter judges that the most satisfied step presetting entry condition of described collecting and distributing type inversion system includes:
Described inverter judges that whether the DC input voitage of described collecting and distributing type inversion system is more than or equal to the startup voltage preset.
Preferably, described inverter judges whether DC bus-bar voltage meets first and preset the soft step opening condition and include: described inverter judges that described DC bus-bar voltage is the most stable to normal working voltage.
Preferably, described inverter judges whether described inverter voltage meets second and preset the soft step opening condition and include: described inverter judges that described inverter voltage is the most stable to line voltage.
Preferably, also include after the step of described inverter control A.C. contactor adhesive:
By communication modes, described inverter notifies that described N number of power optimization device all works with MPPT maximum power point tracking MPPT search pattern.
Preferably, also include after described inverter notifies, by communication modes, the step that described N number of power optimization device all starts with output voltage source module: described N number of power optimization device is according to formula Vbus_ref_n=Vbus_ref-IL_n×RdummyDynamically adjust respective output voltage；Wherein, Vbus_ref_nIt it is the actual reference value of the output voltage of the n-th power optimization device；Vbus_refIdeal reference for described DC bus-bar voltage；IL_nIt it is the inductive current of the n-th power optimization device；RdummyIt it is the resistance of virtual resistance in the controller of the n-th power optimization device；N is the positive integer less than or equal to N.
Preferably, also include after described inverter notifies the step that described N number of power optimization device all starts with voltage source mode by communication modes: control the output of ring as V using the meansigma methods of described DC bus-bar voltagebus_ref。
A kind of collecting and distributing type inversion system, including: inverter and outfan are parallel to N number of power optimization device of described inverter input terminal；Wherein, described inverter and N number of power optimization device all include independent controller, and N is positive integer；Described inverter includes:
First judging unit, is used for judging whether described collecting and distributing type inversion system meets and presets entry condition；
By communication modes, first control unit, for when described collecting and distributing type inversion system meets described default entry condition, notifies that described N number of power optimization device all starts with output voltage source module；
Second judging unit, is used for judging whether DC bus-bar voltage meets first and preset and soft open condition；
Second control unit, for when described DC bus-bar voltage meet described first preset soft open condition time, control that described inverter is soft to be opened and set up inverter voltage；
3rd judging unit, is used for judging whether described inverter voltage meets second and preset and soft open condition；
3rd control unit, for when described inverter voltage meet described second preset soft open condition time, control A.C. contactor adhesive.
Preferably, described first judging unit is used for judging when whether described collecting and distributing type inversion system meets default entry condition, specifically for: judge that whether the DC input voitage of described collecting and distributing type inversion system is more than or equal to the startup voltage preset.
Preferably, described second judging unit be used for judging DC bus-bar voltage whether meet first preset soft when opening condition, specifically for: judge that described DC bus-bar voltage is the most stable to normal working voltage.
Preferably, described 3rd judging unit be used for judging described inverter voltage whether meet second preset soft when opening condition, specifically for: judge that described inverter voltage is the most stable to line voltage.
Preferably, also include:
By communication modes, 4th control unit, after controlling A.C. contactor adhesive in described 3rd control unit, notifies that described N number of power optimization device all works with MPPT search pattern.
Preferably, described second judging unit be used for judging DC bus-bar voltage whether meet first preset soft when opening condition, specifically for: at described N number of power optimization device according to formula Vbu_rse_nf=Vbu_rse-fIL_n×RdumWhen dynamically adjusting respective output voltage, it is judged that whether DC bus-bar voltage meets first is preset and soft open condition；Wherein, Vbus_ref_nIt it is the actual reference value of the output voltage of the n-th power optimization device；Vbus_refIdeal reference for described DC bus-bar voltage；IL_nIt it is the inductive current of the n-th power optimization device；RdummyIt it is the resistance of virtual resistance in the controller of the n-th power optimization device；N is the positive integer less than or equal to N.
Preferably, also include: the 4th control unit, for when described N number of power optimization device dynamically adjusts respective output voltage, control the output of ring as V using the meansigma methods of described DC bus-bar voltagebus_ref。
By the inverter of collecting and distributing type inversion system, the startup method of the collecting and distributing type inversion system that the present invention provides, judges whether described collecting and distributing type inversion system meets and presets entry condition；When described collecting and distributing type inversion system meets described default entry condition, described inverter notify that the power optimization device of N number of control independent of one another all starts with output voltage source module by communication modes；When described inverter judge DC bus-bar voltage meet first preset soft open condition time, described inverter is soft to be opened and sets up inverter voltage；When described inverter judge described inverter voltage meet second preset soft open condition time, just control A.C. contactor adhesive；Preset the soft condition and described second that opens by described first and preset the soft judgement opening condition, before ensure that described inverter startup, its both end voltage meets the condition of unlatching, avoid described DC bus-bar voltage too low time, described inverter is started and the bigger problem of the dash current for alterating and direct current container that causes.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in describing below is only some embodiments of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of the collecting and distributing type inversion system that prior art provides；
Fig. 2 is another flow chart of the startup method of the collecting and distributing type inversion system that the embodiment of the present invention provides；
Fig. 3 is another flow chart of the startup method of the collecting and distributing type inversion system that another embodiment of the present invention provides；
Fig. 4 is another flow chart of the startup method of the collecting and distributing type inversion system that another embodiment of the present invention provides；
Fig. 5 is another structural representation of the collecting and distributing type inversion system that prior art provides；
Fig. 6 is another structural representation of the collecting and distributing type inversion system that another embodiment of the present invention provides；
Fig. 7 is the control block diagram of the power optimization device that another embodiment of the present invention provides；
Fig. 8 is another control block diagram of the collecting and distributing type inversion system that another embodiment of the present invention provides；
Fig. 9 is the structural representation of the inverter that another embodiment of the present invention provides；
Figure 10 is another structural representation of the inverter that another embodiment of the present invention provides.
Detailed description of the invention
Understandable for enabling the above-mentioned purpose of the present invention, feature and advantage to become apparent from, below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is described in detail.
The present invention provides a kind of startup method of collecting and distributing type inversion system, problem bigger to the dash current of alterating and direct current container during to solve inverter startup in prior art.
Concrete, the startup method of described collecting and distributing type inversion system, it is applied to collecting and distributing type inversion system, described collecting and distributing type inversion system is as it is shown in figure 1, include: inverter and outfan are parallel to N number of power optimization device of described inverter input terminal；Wherein, described inverter and N number of power optimization device all include independent controller, and N is positive integer；The startup method of described collecting and distributing type inversion system is as in figure 2 it is shown, include:
S101, described inverter judge whether described collecting and distributing type inversion system meets and preset entry condition；
Before described collecting and distributing type inversion system starts, described inverter needs to carry out the detecting of entry condition, including detecting accordingly and judging.Signal acquisition process for entry condition does not limits, can be depending on the applicable cases that it is concrete, all in the protection domain of the application.
When described collecting and distributing type inversion system meets described default entry condition, by communication modes, execution step S102, described inverter notify that described N number of power optimization device all starts with output voltage source module；
Realize the mode of inverter soft start with respect to single power optimization device, step S102 is started with output voltage source module jointly by described N number of power optimization device, can promote the generated energy of described collecting and distributing type inversion system with optimization.In concrete application, described power optimization device can be Boost power optimization device.
S103, described inverter judge whether DC bus-bar voltage meets first and preset and soft open condition；
After described N number of power optimization device all starts with output voltage source module, can be that described inverter provides certain DC bus-bar voltage；Preset soft when opening condition until described inverter meets described first, perform step S104, described inverter is soft opens and set up inverter voltage；
Described inverter voltage is the alternating voltage that described inverter produces.
S105, described inverter judge whether described inverter voltage meets second and preset and soft open condition；
When described inverter voltage meet described second preset soft open condition time, perform step S106, described inverter control A.C. contactor adhesive.
By the inverter of collecting and distributing type inversion system, the startup method of the collecting and distributing type inversion system that the present embodiment provides, judges whether described collecting and distributing type inversion system meets and presets entry condition；When described collecting and distributing type inversion system meets described default entry condition, described inverter notify that the power optimization device of described N number of control independent of one another all starts with output voltage source module by communication modes；When described inverter judge DC bus-bar voltage meet first preset soft open condition time, described inverter is soft to be opened and sets up inverter voltage；When described inverter judge described inverter voltage meet second preset soft open condition time, just control A.C. contactor adhesive；Preset the soft condition and described second that opens by described first and preset the soft judgement opening condition, before ensure that described inverter startup, its both end voltage meets the condition of unlatching, avoid described DC bus-bar voltage too low time, described inverter is started and the bigger problem of the dash current for alterating and direct current container that causes.
Another embodiment of the present invention additionally provides the startup method of another collecting and distributing type inversion system, as in figure 2 it is shown, include:
S101, described inverter judge whether described collecting and distributing type inversion system meets and preset entry condition；
When described collecting and distributing type inversion system meets described default entry condition, by communication modes, execution step S102, described inverter notify that described N number of power optimization device all starts with output voltage source module；
S103, described inverter judge whether DC bus-bar voltage meets first and preset and soft open condition；
When described inverter meet described first preset soft open condition time, perform step S104, described inverter is soft opens and set up inverter voltage；
S105, described inverter judge whether described inverter voltage meets second and preset and soft open condition；
When described inverter voltage meet described second preset soft open condition time, perform step S106, described inverter control A.C. contactor adhesive.
Wherein, optionally, step S101 includes:
Described inverter judges that whether the DC input voitage of described collecting and distributing type inversion system is more than or equal to the startup voltage preset.
Preferably, described default startup voltage is 500V.
Described inverter, firstly the need of stating the DC input voitage of collecting and distributing type inversion system by corresponding detection equipment Inspection described in being obtained, carries out described DC input voitage more whether more than or equal to the described default judgement starting voltage；Only when described DC input voitage is more than or equal to described default startup voltage, described collecting and distributing type inversion system just meets default entry condition, and described inverter could perform step S102.
Optionally, step S103 includes: described inverter judges that described DC bus-bar voltage is the most stable to normal working voltage.
Described inverter judges that described DC bus-bar voltage, stably to described normal working voltage, illustrates that the input side of the most described inverter has met entry condition, can perform step S104, carry out the soft of described inverter and open and the foundation of described inverter voltage.
Preferably, described normal working voltage is 820V.
Optionally, step S105 includes: described inverter judges that described inverter voltage is the most stable to line voltage.
Described inverter judges that described inverter voltage, stably to described line voltage, illustrates that the outlet side of the most described inverter has met entry condition, and described inverter can perform step S106 and control described A.C. contactor adhesive.
Certainly, in concrete actual application, described default startup voltage and described normal working voltage are not necessarily limited to this, are only a kind of example, can be depending on the applied environment that it is concrete, all in the protection domain of the application.
Another embodiment of the present invention additionally provides the startup method of another collecting and distributing type inversion system, as it is shown on figure 3, include:
S101, described inverter judge whether described collecting and distributing type inversion system meets and preset entry condition；
When described collecting and distributing type inversion system meets described default entry condition, by communication modes, execution step S102, described inverter notify that described N number of power optimization device all starts with output voltage source module；
S103, described inverter judge whether DC bus-bar voltage meets first and preset and soft open condition；
When described inverter meet described first preset soft open condition time, perform step S104, described inverter is soft opens and set up inverter voltage；
S105, described inverter judge whether described inverter voltage meets second and preset and soft open condition；
When described inverter voltage meet described second preset soft open condition time, perform step S106, described inverter control A.C. contactor adhesive.
By communication modes, S107, described inverter notify that described N number of power optimization device all works with MPPT (MaximumPowerPointTracking, MPPT maximum power point tracking) search pattern.
When, after A.C. contactor adhesive described in described inverter control, described inverter starts grid-connected, described N number of power optimization device all should be incorporated into the power networks with its normal duty.In concrete application, described inverter can notify by the way of communication that described N number of power optimization device all works with MPPT search pattern.
Another embodiment of the present invention additionally provides the startup method of another collecting and distributing type inversion system, as shown in Figure 4, and including:
S101, described inverter judge whether described collecting and distributing type inversion system meets and preset entry condition；
When described collecting and distributing type inversion system meets described default entry condition, by communication modes, execution step S102, described inverter notify that described N number of power optimization device all starts with output voltage source module；
Perform step S201, described N number of power optimization device after step s 102 according to formula Vbus_ref_n=Vbus_ref-IL_n×RdummyDynamically adjust respective output voltage, until by step S103, obtain described inverter meet described first preset soft open condition till.Wherein, Vbus_ref_nIt it is the actual reference value of the output voltage of the n-th power optimization device；Vbus_refIdeal reference for described DC bus-bar voltage；IL_nIt it is the inductive current of the n-th power optimization device；RdummyIt it is the resistance of virtual resistance in the controller of the n-th power optimization device；N is the positive integer less than or equal to N.
It addition, can also include after step s 102: control the output of ring as V using the meansigma methods of described DC bus-bar voltagebus_ref。
S103, described inverter judge whether DC bus-bar voltage meets first and preset and soft open condition；
When described inverter meet described first preset soft open condition time, perform step S104, described inverter is soft opens and set up inverter voltage；
S105, described inverter judge whether described inverter voltage meets second and preset and soft open condition；
When described inverter voltage meet described second preset soft open condition time, perform step S106, described inverter control A.C. contactor adhesive.
What deserves to be explained is, in the prior art, multiple boost power optimization devices of prime, all use independent control to be controlled, with output voltage source modes parallel on dc bus.Each work in the way of output voltage stabilizing, use voltage, double current loop modulation.As a example by two boost power optimization device parallel connections, as shown in Figure 5, V1 and I1 is output voltage and the output electric current of boost power optimization device 1 respectively, V2 and I2 is output voltage and the output electric current of boost power optimization device 2 respectively, and C is the bus capacitor of centralized inverter.Due to the impact of the environmental factorss such as the difference of device, the deviation of sampling, temperature, the output voltage of two boost power optimization devices can not be completely the same；When two boost power optimization devices are directly in parallel, owing to each output internal resistance is the least, even if the difference of its output is the least, also can interfere, cause two output electric current I1 and I2 uneven, ultimately result in output voltage fluctuation.
And the present embodiment for multiple independent power optimization devices controlled (in concrete actual application, boost output voltage source can be used) under form directly in parallel, output current unevenness and the problem of output voltage fluctuation occur, by the virtual resistance of increase in the controller of power optimization device (as shown in Figure 6, V1 and I1 is output voltage and the output electric current of boost power optimization device 1 respectively, V2 and I2 is output voltage and the output electric current of boost power optimization device 2 respectively, C is the bus capacitor of centralized inverter, RdummyThe resistance of the virtual resistance for increasing in the controller of power optimization device) and formula Vbus_ref_n=Vbus_ref-IL_n×Rdummy, utilize the output of boost inductive current Intelligent adjustment voltage source, ILnThe biggest, Vbus_ref_nThe least, suppress inductive current uneven with this, stably export busbar voltage, simple, stability is high.
It addition, when exporting the non-band of bus and carrying, utilize principle of stacking, Vbus=1/2 × (V1+V2), VbusFor described DC bus-bar voltage.When exporting bus belt and carrying, due to the introducing of virtual resistance (resistance is less), output can be less than ideal reference V of described DC bus-bar voltagebus_refIf requiring higher to output busbar voltage regulation, can control ring by increasing a meansigma methods, its output is as Vbus_ref, the meansigma methods of regulation output busbar voltage, reduces output voltage regulation.
In concrete actual application, each power optimization device can be Boost power optimization device, and the control block diagram of its output-parallel voltage stabilizing current-sharing is as it is shown in fig. 7, pass through voltage source output-parallel, and utilizes formula Vbus_ref_n=Vbus_ref-ILn×RdummyRealize voltage stabilizing sharing control, wherein, RdummyIt it is the resistance of virtual resistance in the controller of the n-th power optimization device；N is the positive integer less than or equal to N；Vbus_ref_nIt it is the actual reference value of the output voltage of the n-th power optimization device；Vbus_refIdeal reference for described DC bus-bar voltage；IL_nBeing the inductive current of the n-th power optimization device, its value is the biggest, actual reference value V of the output voltage of the n-th power optimization devicebus_ref_nThe least, suppress inductive current uneven with this, dynamic calibration output voltage；And control Voltage loop, V by PIfdb_nFor power optimization device n sampling and outputting voltage Vout_nThe value of feedback obtained, the output of Voltage loop is as reference value I of electric current loopref_n；Electric current loop, I is controlled by PIfdb_nFor power optimization device n sampling inductive current IL_nThe value of feedback obtained, electric current loop is output as modulating wave Vm_n.The hardware circuit of power optimization device n can use boost circuit in the present embodiment.
Increasing meansigma methods and control the control block diagram of ring as shown in Figure 8, its meansigma methods controls the control function of ring and is completed by described inverter.Vbus_avg_refFor the reference value of DC bus-bar voltage meansigma methods, generally 820V；Vbus_avg_fdbFor the value of feedback of DC bus-bar voltage meansigma methods, obtained through mean value calculation by after described inverter sampling DC bus-bar voltage.Described meansigma methods controls the output of ring as Vbus_refIt is handed down to all of described power optimization device by communication modes；Vbus_refIdeal reference for power optimization device output voltage.Each power optimization device (V that power optimization device 1, power optimization device 2 to power optimization device n) issue according to described inverterbus_ref, and utilize virtual resistance method dynamically to adjust self output voltage, Vout_nFor the output voltage of power optimization device n before parallel connection.Then by described inverter sampling DC bus-bar voltage Vbus, and carry out mean value calculation.
Another embodiment of the present invention additionally provides a kind of collecting and distributing type inversion system, as it is shown in figure 1, include: inverter and outfan are parallel to N number of power optimization device of described inverter input terminal；Wherein, described inverter and N number of power optimization device all include independent controller, and N is positive integer；Described inverter is as it is shown in figure 9, include:
First judging unit the 101, first control unit the 102, second judging unit the 103, second control unit the 104, the 3rd judging unit 105 and the 3rd control unit 106.
Wherein, the first judging unit 101 is used for judging whether described collecting and distributing type inversion system meets default entry condition；
By communication modes, first control unit 102, for when described collecting and distributing type inversion system meets described default entry condition, notifies that described N number of power optimization device all starts with output voltage source module；
Second judging unit 103 is used for judging whether DC bus-bar voltage meets first and preset and soft open condition；
Second control unit 104 for when described DC bus-bar voltage meet described first preset soft open condition time, control that described inverter is soft to be opened and set up inverter voltage；
3rd judging unit 105 is used for judging whether described inverter voltage meets second and preset and soft open condition；
3rd control unit 106 for when described inverter voltage meet described second preset soft open condition time, control A.C. contactor adhesive.
The collecting and distributing type inversion system that the present embodiment provides, preset the soft condition and described second that opens by described first and preset the soft judgement opening condition, before ensure that described inverter startup, its both end voltage meets the condition of unlatching, avoid described DC bus-bar voltage too low time, described inverter is started and the bigger problem of the dash current for alterating and direct current container that causes.
Preferably, the first judging unit 101 is used for judging when whether described collecting and distributing type inversion system meets default entry condition, specifically for: judge that whether the DC input voitage of described collecting and distributing type inversion system is more than or equal to the startup voltage preset.
Preferably, the second judging unit 103 be used for judging DC bus-bar voltage whether meet first preset soft when opening condition, specifically for: judge that described DC bus-bar voltage is the most stable to normal working voltage.
Preferably, the 3rd judging unit 105 be used for judging described inverter voltage whether meet second preset soft when opening condition, specifically for: judge that described inverter voltage is the most stable to line voltage.
Preferably, as shown in Figure 10, described inverter also includes:
By communication modes, 4th control unit 107, after controlling A.C. contactor adhesive in described 3rd control unit, notifies that described N number of power optimization device all works with MPPT search pattern.
Preferably, the second judging unit 103 be used for judging DC bus-bar voltage whether meet first preset soft when opening condition, specifically for: at described N number of power optimization device according to formula Vbus_ref_n=Vbus_ref-IL_n×RdummyWhen dynamically adjusting respective output voltage, it is judged that whether DC bus-bar voltage meets first is preset and soft open condition；Wherein, Vbus_ref_nIt it is the actual reference value of the output voltage of the n-th power optimization device；Vbus_refIdeal reference for described DC bus-bar voltage；IL_nIt it is the inductive current of the n-th power optimization device；RdummyIt it is the resistance of virtual resistance in the controller of the n-th power optimization device；N is the positive integer less than or equal to N.
Preferably, also include: the 5th control unit, for when described N number of power optimization device dynamically adjusts respective output voltage, control the output of ring as V using the meansigma methods of described DC bus-bar voltagebus_ref。
Concrete operation principle is same as the previously described embodiments, repeats the most one by one.
The above, be only presently preferred embodiments of the present invention, and the present invention not makees any pro forma restriction.Although the present invention is disclosed above with preferred embodiment, but it is not limited to the present invention.Any those of ordinary skill in the art, without departing under technical solution of the present invention ambit, technical solution of the present invention is made many possible variations and modification by the method and the technology contents that all may utilize the disclosure above, or is revised as the Equivalent embodiments of equivalent variations.Therefore, every content without departing from technical solution of the present invention, the technical spirit of the foundation present invention, to any simple modification made for any of the above embodiments, equivalent variations and modification, all still falls within the range of technical solution of the present invention protection.
Claims (14)
1. the startup method of a collecting and distributing type inversion system, it is characterised in that be applied to collecting and distributing type inversion system, described collecting and distributing type inversion system includes: inverter and outfan are parallel to N number of power optimization device of described inverter input terminal；Wherein, described inverter and N number of power optimization device all include independent controller, and N is positive integer；The startup method of described collecting and distributing type inversion system includes:
Described inverter judges whether described collecting and distributing type inversion system meets and presets entry condition；
When described collecting and distributing type inversion system meets described default entry condition, by communication modes, described inverter notifies that described N number of power optimization device all starts with output voltage source module；
Described inverter judges whether DC bus-bar voltage meets first and preset and soft open condition；
When described DC bus-bar voltage meet described first preset soft open condition time, described inverter is soft to be opened and sets up inverter voltage；
Described inverter judges whether described inverter voltage meets second and preset and soft open condition；
When described inverter voltage meet described second preset soft open condition time, described inverter control A.C. contactor adhesive.
The startup method of collecting and distributing type inversion system the most according to claim 1, it is characterised in that described inverter judges that the most satisfied step presetting entry condition of described collecting and distributing type inversion system includes:
Described inverter judges that whether the DC input voitage of described collecting and distributing type inversion system is more than or equal to the startup voltage preset.
The startup method of collecting and distributing type inversion system the most according to claim 1, it is characterized in that, described inverter judges whether DC bus-bar voltage meets first and preset the soft step opening condition and include: described inverter judges that described DC bus-bar voltage is the most stable to normal working voltage.
The startup method of collecting and distributing type inversion system the most according to claim 1, it is characterized in that, described inverter judges whether described inverter voltage meets second and preset the soft step opening condition and include: described inverter judges that described inverter voltage is the most stable to line voltage.
The startup method of collecting and distributing type inversion system the most according to claim 1, it is characterised in that also include after the step of described inverter control A.C. contactor adhesive:
By communication modes, described inverter notifies that described N number of power optimization device all works with MPPT maximum power point tracking MPPT search pattern.
The startup method of collecting and distributing type inversion system the most according to claim 1, it is characterized in that, also include after described inverter notifies, by communication modes, the step that described N number of power optimization device all starts with output voltage source module: described N number of power optimization device is according to formula Vbus_ref_n=Vbus_ref-IL_n×RdummyDynamically adjust respective output voltage；Wherein, Vbus_ref_nIt it is the actual reference value of the output voltage of the n-th power optimization device；Vbus_refIdeal reference for described DC bus-bar voltage；IL_nIt it is the inductive current of the n-th power optimization device；RdummyIt it is the resistance of virtual resistance in the controller of the n-th power optimization device；N is the positive integer less than or equal to N.
The startup method of collecting and distributing type inversion system the most according to claim 6, it is characterized in that, also include after described inverter control notifies the step that described N number of power optimization device all starts with output voltage source module by communication modes: control the output of ring as V using the meansigma methods of described DC bus-bar voltagebus_ref。
8. a collecting and distributing type inversion system, it is characterised in that including: inverter and outfan are parallel to N number of power optimization device of described inverter input terminal；Wherein, described inverter and N number of power optimization device all include independent controller, and N is positive integer；Described inverter includes:
First judging unit, is used for judging whether described collecting and distributing type inversion system meets and presets entry condition；
By communication modes, first control unit, for when described collecting and distributing type inversion system meets described default entry condition, notifies that described N number of power optimization device all starts with output voltage source module；
Second judging unit, is used for judging whether DC bus-bar voltage meets first and preset and soft open condition；
Second control unit, for when described DC bus-bar voltage meet described first preset soft open condition time, control that described inverter is soft to be opened and set up inverter voltage；
3rd judging unit, is used for judging whether described inverter voltage meets second and preset and soft open condition；
3rd control unit, for when described inverter voltage meet described second preset soft open condition time, control A.C. contactor adhesive.
Collecting and distributing type inversion system the most according to claim 8, it is characterized in that, described first judging unit is used for judging when whether described collecting and distributing type inversion system meets default entry condition, specifically for: judge that whether the DC input voitage of described collecting and distributing type inversion system is more than or equal to the startup voltage preset.
Collecting and distributing type inversion system the most according to claim 8, it is characterized in that, described second judging unit be used for judging DC bus-bar voltage whether meet first preset soft when opening condition, specifically for: judge that described DC bus-bar voltage is the most stable to normal working voltage.
11. collecting and distributing type inversion systems according to claim 8, it is characterised in that described 3rd judging unit be used for judging described inverter voltage whether meet second preset soft when opening condition, specifically for: judge that described inverter voltage is the most stable to line voltage.
12. collecting and distributing type inversion systems according to claim 8, it is characterised in that also include:
By communication modes, 4th control unit, after controlling A.C. contactor adhesive in described 3rd control unit, notifies that described N number of power optimization device all works with MPPT search pattern.
13. collecting and distributing type inversion systems according to claim 8, it is characterised in that described second judging unit be used for judging DC bus-bar voltage whether meet first preset soft when opening condition, specifically for: at described N number of power optimization device according to formula Vbus_ref_n=Vbus_ref-IL_n×RdummyWhen dynamically adjusting respective output voltage, it is judged that whether DC bus-bar voltage meets first is preset and soft open condition；Wherein, Vbus_ref_nIt it is the actual reference value of the output voltage of the n-th power optimization device；Vbus_refIdeal reference for described DC bus-bar voltage；IL_nIt it is the inductive current of the n-th power optimization device；RdummyIt it is the resistance of virtual resistance in the controller of the n-th power optimization device；N is the positive integer less than or equal to N.
14. collecting and distributing type inversion systems according to claim 13, it is characterized in that, also include: the 5th control unit, for when described N number of power optimization device dynamically adjusts respective output voltage, control the output of ring as V using the meansigma methods of described DC bus-bar voltagebus_ref。
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