CN108565892A - A kind of fault ride-through method, device and photovoltaic generating system - Google Patents
A kind of fault ride-through method, device and photovoltaic generating system Download PDFInfo
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- CN108565892A CN108565892A CN201810408450.2A CN201810408450A CN108565892A CN 108565892 A CN108565892 A CN 108565892A CN 201810408450 A CN201810408450 A CN 201810408450A CN 108565892 A CN108565892 A CN 108565892A
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- H02J3/385—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/02—Arrangements for reducing harmonics or ripples
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The invention discloses a kind of fault ride-through methods, are suitable for photovoltaic generating system, including：The voltage deviation amount and current measurement value for obtaining photovoltaic panel, current inner loop reference value is converted to by voltage deviation amount；Judge whether the voltage deviation amount of DC bus is more than dead zone threshold value；If so, the deviation of the voltage deviation amount and dead zone threshold value of output DC bus, and deviation is multiplied by proportionality coefficient, obtain current deviation amount；Calculating current inner ring reference value subtracts the value of the current measurement value and current deviation amount of photovoltaic panel, obtains the current reference value of photovoltaic panel；Current reference value is converted into duty cycle signals, so that photovoltaic generating system controls the stabilization of DC bus-bar voltage according to duty cycle signals.The invention also discloses a kind of fault traversing device and a kind of photovoltaic generating systems.Effective limitation of photovoltaic panel injecting power, reduces the fluctuation of DC bus-bar voltage when can realize AC network failure under the premise of no communication, the final fault traversing for realizing photovoltaic generating system.
Description
Technical field
The present invention relates to a kind of technical field of photovoltaic power generation more particularly to fault ride-through method, device and photovoltaic generation systems
System.
Background technology
Currently, with the rapid decrease of regenerative resource development and application cost.The installation of the electricity generation systems such as wind-powered electricity generation and photovoltaic
Scale is continuously increased.2015, global renewable energy power generation adding new capacity was more than that conventional energy resource generator installation holds for the first time
Amount, shows global power system Construction just in the transformation of recurring structure.
During the photovoltaic generation of the prior art, the electric energy that photovoltaic generating system is sent out first passes around DC-DC (direct currents-
Direct current) converter boost, it is incorporated to DC bus after collecting, then alternating current is switched to by DC-AC (DC-AC) converter, passes through
It is incorporated to AC network after crossing transformer boosting.Direct current is respectively adopted with DC-AC converters in the DC-DC converter of photovoltaic generating system
Boost pressure controller and power-current dual-loop controller are controlled.When DC boosting controller and power-current dual-loop controller
When in the presence of communication, if earth fault occurs for AC network, ac grid voltage reduces, and DC-AC converters inject AC network
Power also decreases, if the power of the DC bus of DC-DC converter injection at this time is constant, the voltage of DC bus will rise immediately
Height, when beyond protection limit value, photovoltaic generating system will move out operation.When AC network breaks down, if DC-AC converters
It detects and this signal is passed into DC boosting controller by communication after failure, the injection work(of DC-DC converter can be reduced
Rate, to reduce DC bus-bar voltage, but there are one for the communication between DC boosting controller and power-current dual-loop controller
The control response speed of fixed delay, DC bus-bar voltage is slower.
Invention content
The purpose of the embodiment of the present invention is to provide a kind of fault ride-through method, device and photovoltaic generating system, can be in nothing
Effective limitation of photovoltaic panel injecting power, reduces the wave of DC bus-bar voltage when realizing AC network failure under the premise of communication
It is dynamic, the final fault traversing for realizing photovoltaic generating system.
To achieve the above object, an embodiment of the present invention provides a kind of fault ride-through methods, are suitable for photovoltaic generating system,
Including：
The voltage deviation amount is converted to current inner loop reference by the voltage deviation amount and current measurement value for obtaining photovoltaic panel
Value；
The voltage deviation amount for obtaining DC bus, judges whether the voltage deviation amount of the DC bus is more than dead zone threshold
Value；
If so, the deviation of the voltage deviation amount and the dead zone threshold value of the DC bus is exported, and will be described
Deviation is multiplied by proportionality coefficient, obtains current deviation amount；If it is not, it is zero then to export the deviation；
The value that the current inner loop reference value subtracts the current measurement value and the current deviation amount of the photovoltaic panel is calculated,
Obtain the current reference value of the photovoltaic panel；
The current reference value is converted into duty cycle signals, so that the photovoltaic generating system is believed according to the duty ratio
The stabilization of number control DC bus-bar voltage.
Compared with prior art, a kind of fault ride-through method disclosed by the invention passes through the voltage deviation amount in DC bus
When more than dead zone threshold value, the deviation of the voltage deviation amount and dead zone threshold value of DC bus is exported, and by the deviation
It is multiplied by proportionality coefficient, obtains current deviation amount；Then the current measurement of photovoltaic panel is subtracted by calculating current inner ring reference value again
The value of value and current deviation amount, obtains the current reference value of photovoltaic panel；Current reference value is finally converted into duty cycle signals, with
Photovoltaic generating system is set to control the stabilization of DC bus-bar voltage according to duty cycle signals.It solves and works as AC network in the prior art
When breaking down, for the communication between DC boosting controller and power-current dual-loop controller there are certain delay, direct current is female
The slow problem of control response of line voltage, photovoltaic panel is noted when can realize AC network failure under the premise of no communication
The effective limitation for entering power, reduces the fluctuation of DC bus-bar voltage, the final fault traversing for realizing photovoltaic generating system.
As the improvement of said program, the voltage deviation amount for obtaining photovoltaic panel and current measurement value specifically include：
The voltage measuring value and current measurement value for obtaining photovoltaic panel, the Voltage Reference of photovoltaic panel is obtained by MPPT controller
Value；
The voltage difference for calculating the voltage reference value of photovoltaic panel and the voltage measuring value of photovoltaic panel, obtains the electricity of the photovoltaic panel
Press departure.
As the improvement of said program, the voltage deviation amount for obtaining DC bus specifically includes：
The voltage reference value and voltage measuring value for obtaining DC bus, calculate the voltage reference value and electricity of the DC bus
The voltage difference for pressing measured value, obtains the voltage deviation amount of the DC bus.
To achieve the above object, the embodiment of the present invention additionally provides a kind of fault traversing device, is suitable for photovoltaic generation system
System, including：
First voltage outer shroud control module, the voltage deviation amount for obtaining photovoltaic panel convert the voltage deviation amount
For current inner loop reference value；
Second voltage outer shroud control module, the voltage deviation amount for obtaining DC bus, judges the DC bus
Whether voltage deviation amount is more than dead zone threshold value；If so, exporting the voltage deviation amount and dead zone door of the DC bus
The deviation of threshold value, and the deviation is multiplied by proportionality coefficient, obtain current deviation amount；If it is not, then exporting the deviation
It is zero；
Current inner loop control module, the current measurement value for obtaining photovoltaic panel are additionally operable to calculate the current inner loop ginseng
The value that value subtracts the current measurement value and the current deviation amount of the photovoltaic panel is examined, the current reference of the photovoltaic panel is obtained
Value；
Auxiliary direct current presses control module, for the current reference value to be converted to duty cycle signals, so that the light
Photovoltaic generating system controls the stabilization of the DC bus-bar voltage according to the duty cycle signals.
Compared with prior art, a kind of fault traversing device disclosed by the invention is existed by second voltage outer shroud control module
When the voltage deviation amount of DC bus is more than dead zone threshold value, the inclined of the voltage deviation amount of DC bus and dead zone threshold value is exported
Difference, and the deviation is multiplied by proportionality coefficient, obtain current deviation amount；Then it is calculated again by current inner loop control module
Current inner loop reference value subtracts the value of the current measurement value and current deviation amount of photovoltaic panel, obtains the current reference value of photovoltaic panel；
Finally by auxiliary direct current pressure control module current reference value is converted into duty cycle signals so that photovoltaic generating system according to
Duty cycle signals control the stabilization of DC bus-bar voltage.It solves in the prior art when AC network breaks down, direct current liter
There are certain delay, the control responses of DC bus-bar voltage for communication between pressure controller and power-current dual-loop controller
Slow problem, effective limit of photovoltaic panel injecting power when can realize AC network failure under the premise of no communication
System, reduces the fluctuation of DC bus-bar voltage, the final fault traversing for realizing photovoltaic generating system.
As the improvement of said program, the fault traversing device further includes MPPT controller, and the MPPT controller is used
In the voltage measuring value and current measurement value that obtain photovoltaic panel, and according to the voltage measuring value and current measurement value of the photovoltaic panel
Obtain the voltage reference value of the photovoltaic panel.
As the improvement of said program, the first voltage outer shroud control module includes first comparator and the first PI controls
Device；Wherein,
The first comparator is used to calculate the voltage difference of the voltage reference value of photovoltaic panel and the voltage measuring value of photovoltaic panel,
Obtain the voltage deviation amount of the photovoltaic panel；
The first PI controllers are used to the voltage deviation amount being converted to current inner loop reference value.
As the improvement of said program, the second voltage outer shroud control module includes the second comparator and proportional component control
Device processed；Wherein,
Second comparator is used to obtain the voltage deviation amount of DC bus, judges the voltage deviation of the DC bus
Whether amount is more than dead zone threshold value；If so, exporting the inclined of the voltage deviation amount of the DC bus and the dead zone threshold value
Difference；If it is not, it is zero then to export the deviation；
The proportional component controller is used to the deviation being multiplied by proportionality coefficient, obtains current deviation amount.
As the improvement of said program, the current inner loop control module includes third comparator, the third comparator
Current measurement value for obtaining photovoltaic panel is additionally operable to calculate the electric current survey that the current inner loop reference value subtracts the photovoltaic panel
The value of magnitude and the current deviation amount, obtains the current reference value of the photovoltaic panel.
As the improvement of said program, auxiliary direct current pressure control module includes the 2nd PI controllers, and described second
PI controllers are used to the current reference value being converted to duty cycle signals, so that the photovoltaic generating system is according to the duty
Than the stabilization for the voltage that signal controls the DC bus.
Above-mentioned purpose is not implemented, the embodiment of the present invention additionally provides a kind of photovoltaic generating system, including：Photovoltaic panel, direct current
Booster converter, direct-current-alternating-current converter, DC-AC controller, transformer, AC network and any of the above-described embodiment
The fault traversing device；Wherein,
The photovoltaic panel is for converting light energy into DC voltage；The DC booster converter is used for the direct current
Pressure is boosted；The direct-current-alternating-current converter is used to the DC voltage after boosting being converted to alternating voltage；The transformer
For boosting to the alternating voltage, to which the alternating voltage after boosting imports in input AC power grid；The direct current-
Alternating-current controller is used to control the work of the direct-current-alternating-current converter；
The fault traversing device is for controlling the DC booster converter, when DC booster converter output
When DC bus-bar voltage is more than the dead zone threshold value in the fault traversing device, the fault traversing device output duty cycle letter
Number, so that stabilization of the DC booster converter according to the DC bus-bar voltage of duty cycle signals control output.
Description of the drawings
Fig. 1 is a kind of flow chart of fault ride-through method provided in an embodiment of the present invention；
Fig. 2 is a kind of signal transmission schematic diagram of fault ride-through method provided in an embodiment of the present invention；
Fig. 3 is a kind of structural schematic diagram of fault traversing device provided in an embodiment of the present invention；
Fig. 4 is a kind of structural schematic diagram of photovoltaic generating system provided in an embodiment of the present invention；
Fig. 5 is the circuit structure of DC booster converter 102 in a kind of photovoltaic generating system provided in an embodiment of the present invention
Figure；
Fig. 6 is the structural representation of direct-current-alternating-current converter 103 in a kind of photovoltaic generating system provided in an embodiment of the present invention
Figure；
Fig. 7 is the signal transmission of DC-AC controller 107 in a kind of photovoltaic generating system provided in an embodiment of the present invention
Schematic diagram.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment shall fall within the protection scope of the present invention.
Embodiment one
It is a kind of flow chart of fault ride-through method provided in an embodiment of the present invention referring to Fig. 1, Fig. 1；Including：
S1, the voltage deviation amount and current measurement value for obtaining photovoltaic panel, current inner loop is converted to by the voltage deviation amount
Reference value；
S2, the voltage deviation amount for obtaining DC bus, judge whether the voltage deviation amount of the DC bus is more than dead zone
Threshold value；
S3, if so, export the deviation of the voltage deviation amount and the dead zone threshold value of the DC bus, and by institute
It states deviation and is multiplied by proportionality coefficient, obtain current deviation amount；If it is not, it is zero then to export the deviation；
S4, it calculates the current inner loop reference value and subtracts the current measurement value of the photovoltaic panel and the current deviation amount
Value, obtains the current reference value of the photovoltaic panel；
S5, the current reference value is converted into duty cycle signals, so that photovoltaic generating system is believed according to the duty ratio
The stabilization of number control DC bus-bar voltage.
Preferably, the fault ride-through method is suitable for photovoltaic generating system, and the photovoltaic generating system may include light
Lie prostrate plate, DC booster converter, direct-current-alternating-current converter, DC-AC controller, transformer, AC network.Wherein, described
For converting light energy into DC voltage and importing the DC voltage in DC bus, the DC bus is used for photovoltaic panel
Connect the photovoltaic panel and the DC booster converter；The DC booster converter is for rising the DC voltage
Pressure；The direct-current-alternating-current converter is used to the DC voltage after boosting being converted to alternating voltage；The transformer is used for institute
It states alternating voltage to boost, to which the alternating voltage after boosting imports in input AC power grid；The DC-AC control
Device is used to control the work of the direct-current-alternating-current converter.
Specifically, in step sl, referring to Fig. 2, obtaining the voltage measuring value U of photovoltaic panelpvWith current measurement value Ipv, lead to
It crosses MPPT (MPPT maximum power point tracking) controller and obtains the voltage reference value U of photovoltaic panelpvref；Preferably, can compare by first
Device 11 calculates the voltage reference value U of photovoltaic panelpvrefWith the voltage measuring value U of photovoltaic panelpvVoltage difference, to obtain the light
Lie prostrate the voltage deviation amount of plate；And the voltage deviation amount of the photovoltaic panel is converted to by current inner loop ginseng by the first PI controllers 12
Examine value Ipvref。
Specifically, in step S2~S3, the voltage reference value of DC bus can be obtained by the second comparator 21
UdcrefWith voltage measuring value Udc, it is preferred that the voltage reference value U of the DC busdcrefIt can be manually set, it specifically can root
It is set according to the specific works situation of photovoltaic generating system, the voltage measuring value U of the DC busdcDescribed in measuring in real time
The voltage of DC bus.Calculate the voltage reference value U of the DC busdcrefWith voltage measuring value UdcVoltage difference, obtain institute
State the voltage deviation amount of DC bus.Then judge whether the voltage deviation amount of the DC bus is more than dead zone threshold value；If
It is the deviation Δ U of the voltage deviation amount and the dead zone threshold value that then export the DC busdc, and pass through proportional component
Controller 22 is by the deviation Δ UdcIt is multiplied by Proportional coefficient K, obtains current deviation amount Δ Ipv；If it is not, then exporting the deviation
It is worth Δ UdcIt is zero.Preferably, when AC network breaks down, the DC bus-bar voltage will increase immediately, and the voltage is surveyed
Magnitude UdcIt increases, the voltage deviation amount of the DC bus also increases, at this point, the voltage deviation amount of the DC bus is more than extremely
Area's threshold value.
Specifically, in step s 4, the current inner loop reference value I is calculated by third comparator 31pvrefIt subtracts described
The value of the current measurement value Ipv of photovoltaic panel and the current deviation amount Δ Ipv, obtain the current reference value of the photovoltaic panel.
Specifically, in step s 5, the current reference value is converted to duty cycle signals by the 2nd PI controllers 41
Dpv, so that the photovoltaic generating system is according to the duty cycle signals DpvIGBT device in DC booster converter is controlled, to
Make the stabilization of the DC bus-bar voltage, it can be achieved that when fault in ac transmission system photovoltaic generating system busbar voltage stability contorting,
To realize its effective fault traversing.
Compared with prior art, a kind of fault ride-through method disclosed by the invention passes through the voltage deviation amount in DC bus
When more than dead zone threshold value, the deviation of the voltage deviation amount and dead zone threshold value of DC bus is exported, and by the deviation
It is multiplied by proportionality coefficient, obtains current deviation amount；Then pass through calculating current inner ring reference value I againpvrefSubtract the electric current of photovoltaic panel
The value of measured value Ipv and current deviation amount Δ Ipv, obtain the current reference value of photovoltaic panel；Finally current reference value is converted to
Duty cycle signals Dpv, so that photovoltaic generating system is according to duty cycle signals DpvControl the stabilization of DC bus-bar voltage.It solves existing
Have in technology when AC network breaks down, the communication between DC boosting controller and power-current dual-loop controller is deposited
In certain delay, the slow problem of control response of DC bus-bar voltage can realize friendship under the premise of no communication
Effective limitation of photovoltaic panel injecting power, reduces the fluctuation of DC bus-bar voltage, finally realizes photovoltaic generation when flowing electric network fault
The fault traversing of system.
Embodiment two
It is a kind of structural schematic diagram of fault traversing device provided in an embodiment of the present invention referring to Fig. 3, Fig. 3；Including：
First voltage outer shroud control module 1, the voltage deviation amount for obtaining photovoltaic panel convert the voltage deviation amount
For current inner loop reference value；
Second voltage outer shroud control module 2, the voltage deviation amount for obtaining DC bus, judges the DC bus
Whether voltage deviation amount is more than dead zone threshold value；If so, exporting the voltage deviation amount and dead zone door of the DC bus
The deviation of threshold value, and the deviation is multiplied by proportionality coefficient, obtain current deviation amount；If it is not, then exporting the deviation
It is zero；
Current inner loop control module 3, the current measurement value for obtaining photovoltaic panel are additionally operable to calculate the current inner loop ginseng
The value that value subtracts the current measurement value and the current deviation amount of the photovoltaic panel is examined, the current reference of the photovoltaic panel is obtained
Value；
Auxiliary direct current presses control module 4, for the current reference value to be converted to duty cycle signals, so that the light
Photovoltaic generating system controls the stabilization of the DC bus-bar voltage according to the duty cycle signals.
Preferably, the fault traversing device further includes MPPT controller 5, and the MPPT controller 5 is for obtaining photovoltaic
The voltage measuring value and current measurement value of plate, and the light is worth to according to the voltage measuring value of the photovoltaic panel and current measurement
Lie prostrate the voltage reference value of plate.
Preferably, the fault traversing device is suitable for photovoltaic generating system, and the photovoltaic generating system may include light
Lie prostrate plate, DC booster converter, direct-current-alternating-current converter, DC-AC controller, transformer, AC network and the event
Hinder traversing device.Wherein, the photovoltaic panel is female for converting light energy into DC voltage and the DC voltage being imported direct current
In line, the DC bus is for connecting the photovoltaic panel and the DC booster converter；The DC booster converter is used
It boosts in the DC voltage；The direct-current-alternating-current converter is used to the DC voltage after boosting being converted to exchange
Voltage；The transformer is for boosting to the alternating voltage, to which the alternating voltage after boosting imports input AC
In power grid；The DC-AC controller is used to control the work of the direct-current-alternating-current converter.
Specifically, referring to Fig. 2, the MPPT controller 5 obtains the voltage measuring value U of photovoltaic panelpvAnd current measurement value
Ipv, the voltage reference value U of photovoltaic panel is obtained by the MPPT controller 5pvref。
Preferably, the first voltage outer shroud control module 1 includes first comparator 11 and the first PI controllers 12；It can lead to
Cross the voltage reference value U that the first comparator 11 calculates photovoltaic panelpvrefWith the voltage measuring value U of photovoltaic panelpvVoltage difference,
To obtain the voltage deviation amount of the photovoltaic panel；And by the first PI controllers 12 by the voltage deviation of the photovoltaic panel
Amount is converted to current inner loop reference value Ipvref。
Specifically, the second voltage outer shroud control module 2 includes the second comparator 21 and proportional component controller 22, it can
To obtain the voltage reference value U of DC bus by the second comparator 21dcrefWith voltage measuring value Udc, it is preferred that the direct current
The voltage reference value U of busbardcrefIt can be manually set, can specifically be set according to the specific works situation of photovoltaic generating system,
The voltage measuring value U of the DC busdcFor the voltage of the DC bus measured in real time.Calculate the electricity of the DC bus
Press reference value UdcrefWith voltage measuring value UdcVoltage difference, obtain the voltage deviation amount of the DC bus.
Then judge whether the voltage deviation amount of the DC bus is more than dead zone threshold value；If so, output is described straight
Flow the deviation Δ U of the voltage deviation amount and the dead zone threshold value of busbardc, and will be described inclined by proportional component controller 22
Difference DELTA UdcIt is multiplied by Proportional coefficient K, obtains current deviation amount Δ Ipv；If it is not, then exporting the deviation Δ UdcIt is zero.It is preferred that
, when AC network breaks down, the DC bus-bar voltage will increase immediately, the voltage measuring value UdcIt increases, it is described
The voltage deviation amount of DC bus also increases, at this point, the voltage deviation amount of the DC bus is more than dead zone threshold value.
Specifically, the current inner loop control module 3 includes third comparator 31, calculated by third comparator 31 described
Current inner loop reference value IpvrefThe value for subtracting the current measurement value Ipv and the current deviation amount Δ Ipv of the photovoltaic panel, obtains
The current reference value of the photovoltaic panel.
Specifically, the auxiliary direct current pressure control module 4 includes the 2nd PI controllers 41, pass through the 2nd PI controllers 41
The current reference value is converted into duty cycle signals Dpv, so that the photovoltaic generating system is according to the duty cycle signals Dpv
IGBT device in DC booster converter is controlled, to make the stabilization of the DC bus-bar voltage, it can be achieved that fault in ac transmission system
When photovoltaic generating system busbar voltage stability contorting, to realize its effective fault traversing.
Compared with prior art, a kind of fault traversing device disclosed by the invention passes through second voltage outer shroud control module 2
When the voltage deviation amount of DC bus is more than dead zone threshold value, the voltage deviation amount and dead zone threshold value of DC bus are exported
Deviation, and the deviation is multiplied by proportionality coefficient, obtain current deviation amount；Then pass through current inner loop control module meter again
Calculate current inner loop reference value IpvrefThe value for subtracting the current measurement value Ipv and current deviation amount Δ Ipv of photovoltaic panel, obtains photovoltaic panel
Current reference value；Current reference value is converted into duty cycle signals D finally by auxiliary direct current pressure control modulepv, so that
Photovoltaic generating system is according to duty cycle signals DpvControl the stabilization of DC bus-bar voltage.It solves and works as AC network in the prior art
When breaking down, for the communication between DC boosting controller and power-current dual-loop controller there are certain delay, direct current is female
The slow problem of control response of line voltage, photovoltaic panel is noted when can realize AC network failure under the premise of no communication
The effective limitation for entering power, reduces the fluctuation of DC bus-bar voltage, the final fault traversing for realizing photovoltaic generating system.
Embodiment three
It is a kind of structural schematic diagram of photovoltaic generating system provided in an embodiment of the present invention referring to Fig. 4, Fig. 4；Including：
Photovoltaic panel 101, direct-current-alternating-current converter 103, DC-AC controller 107, becomes DC booster converter 102
Fault traversing device 106 described in depressor 104, AC network 105 and above-described embodiment two；Wherein,
The photovoltaic panel 101 is imported for converting light energy into DC voltage, and by the DC voltage in DC bus,
The DC bus is for connecting the photovoltaic panel 101 and the DC booster converter 102；The DC booster converter
102 for boosting to the DC voltage；DC voltage after the direct-current-alternating-current converter 103 is used to boost turns
It is changed to alternating voltage；The transformer 104 is for boosting to the alternating voltage, to which the alternating voltage after boosting is defeated
Enter in AC network 105；The DC-AC controller 107 is used to control the work of the direct-current-alternating-current converter 103；
The fault traversing device 106 is for controlling the DC booster converter 102, when the DC booster converter
When the DC bus-bar voltage of 102 outputs is more than the dead zone threshold value in the fault traversing device 106, the fault traversing device
106 output duty cycle signals, so that the DC booster converter 102 is according to the described straight of duty cycle signals control output
Flow the stabilization of busbar voltage.
Specifically, referring to Fig. 5, Fig. 5 is that DC boosting becomes in provided in an embodiment of the present invention a kind of therefore photovoltaic generating system
The circuit structure diagram of parallel operation 102, including：First inductance L1, diode D1, capacitance C1 and by-pass switch IGBT, when the event
When hindering 106 output duty cycle signal of traversing device, the by-pass switch IGBT is accounted for according to the duty cycle signals adjustment is received
Empty ratio can control the DC booster converter 102 to realize the maximal power tracing control of the photovoltaic generating system
Output power, and then the voltage stabilization of the DC bus can be made, the voltage of the DC bus is limited without departing from protection
Value, the photovoltaic generating system will continue to run with.
Specifically, referring to Fig. 6, Fig. 6 is DC-AC conversion in a kind of photovoltaic generating system provided in an embodiment of the present invention
The structural schematic diagram of device 103；The direct-current-alternating-current converter 103 is using modular multilevel structure (Modular Multi
Level, MMC), each bridge arm is made of N number of submodule, the SM in figure1~SMNIndicate the submodule, the L in figure is indicated
Bridge arm reactor, A, B, C in figure indicate the three-phase of exchange side, the U in figuredcFor the voltage measuring value of the DC bus.It is excellent
Choosing, the submodule uses half-bridge structure.By the DC bus-bar voltage controller of the DC-AC controller 107 and
DC bus-bar voltage control and Reactive Power Control may be implemented in reactive power controller.
Specifically, referring to Fig. 7, Fig. 7 is that DC-AC controls in a kind of photovoltaic generating system provided in an embodiment of the present invention
The signal transmission schematic diagram of device 107；Including：DC bus-bar voltage controller 6, reactive power controller 7, current inner loop controller
8, DQ turns ABC converters 9 and pwm pulse generator 10；
The current inner loop controller 8 uses DQ decoupling control structures；The DQ turns ABC converters 9 by DQ axis with reference to letter
Number switching to the signal under tri- phase coordinate systems of ABC, the control system in the photovoltaic generating system is realized under DQ coordinate systems,
But real system is under tri- phase coordinate systems of ABC, so it is exactly that good controlled quentity controlled variable is converted into actual value that DQ, which turns ABC, just
Just it is controlled；The pwm pulse generator 10 generates modulated signal, for controlling institute in the direct-current-alternating-current converter 103
State the switching of submodule.
Preferably, the DC bus-bar voltage controller 6 includes the 4th comparator 61 and the 3rd PI controllers 62, and described the
Four comparators obtain the voltage reference value U of the DC busdcrefWith voltage measuring value Udc, calculate the electricity of the DC bus
Press reference value UdcrefWith voltage measuring value UdcVoltage difference, obtain the voltage deviation amount of the DC bus.Pass through described again
The voltage deviation amount of the DC bus is converted to D shaft current reference values I by three PI controllers 62dref。
Preferably, the reactive power controller 7 includes the 5th comparator 71 and the 4th PI controllers 72, the 5th ratio
Compared with the reactive power reference qref Q that device 71 obtains the photovoltaic generating systemrefWith wattless power measurement value Q, the idle work(is calculated
Rate reference value QrefWith the difference power of wattless power measurement value Q, reactive power deviation is obtained, then control by the 4th PI
The reactive power deviation is converted to the current reference value I of Q axis by device 72qref。
Preferably, the current inner loop controller 8 includes the 6th comparator 81, the 5th PI controllers 82, the 7th comparator
83, the 8th comparator 84, the 6th PI controllers 85 and the 8th comparator 86；6th comparator 81 obtains the electric current of D axis
Measured value Id, calculate the D shaft currents reference value IdrefWith the current measurement value I of the D axisdThe first difference, then pass through again
The 5th PI controllers 82 and the 7th comparator 83 calculate the D axis components u of alternating voltagedWith Q axis compensation rate (Q axis
Current measurement value IqBe multiplied by bridge arm reactance wL) be added after subtract the value of first difference, obtain the Voltage Reference amount of D axis.Together
Reason, the 8th comparator 84 obtain the current measurement value I of Q axisq, calculate the Q shaft currents reference value IqrefWith the Q axis
Current measurement value IqThe second difference, then exchanged again by the calculating of the 6th PI controllers 85 and the 8th comparator 86
The Q axis components u of voltageqWith D axis compensation rate (the current measurement value I of D axisdBe multiplied by bridge arm reactance wL) subtract each other after subtract described again
The value of two differences obtains the Voltage Reference amount of Q axis.
Preferably, the DQ turns ABC converters 9 and leads to the Voltage Reference amount of the Voltage Reference amount of the D axis and the Q axis
It crosses converter and is converted to reference quantity under ABC coordinate systems, the ABC coordinate systems refer to ABC three-phases corresponding voltage, the magnitude of current three
Phase variable.
Preferably, the pwm pulse generator 10 generates modulated signal, for controlling the direct-current-alternating-current converter 103
Described in submodule switching.107 one side of DC-AC controller can maintain the constant of the voltage of DC bus,
On the other hand the reactive power of injection power grid can be controlled (its reference value is generally 0).
Further, the specific work process of the fault traversing device 106 can refer to the worked of above-described embodiment two
Journey, details are not described herein.
Compared with prior art, a kind of photovoltaic generating system disclosed by the invention is existed by the fault traversing device 106
When detecting that the voltage deviation amount of DC bus is more than dead zone threshold value, judgement AC network 105 breaks down, at this time the event
Hinder traversing device 106 and export a duty cycle signals, so that the by-pass switch IGBT in the DC booster converter 102
Duty ratio is adjusted according to the duty cycle signals, it, can to realize the maximal power tracing control of the photovoltaic generating system
The output power for controlling the DC booster converter 102 reduces the injecting power of the photovoltaic panel 101 when failure, to keep away
Exempt from that DC bus-bar voltage is higher, and then the voltage stabilization of the DC bus can be made, the voltage of the DC bus will not surpass
Go out and protect limit value, the photovoltaic generating system will continue to run with.It solves in the prior art when AC network breaks down, directly
Flowing communicating between boost pressure controller and power-current dual-loop controller, there are certain delay, the controls of DC bus-bar voltage
The slower problem of response speed, 101 injecting power of photovoltaic panel when can realize AC network failure under the premise of no communication
Effectively limitation, reduces the fluctuation of DC bus-bar voltage, the final fault traversing for realizing photovoltaic generating system.
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (10)
1. a kind of fault ride-through method, which is characterized in that it is suitable for photovoltaic generating system, including：
The voltage deviation amount and current measurement value for obtaining photovoltaic panel, current inner loop reference value is converted to by the voltage deviation amount；
The voltage deviation amount for obtaining DC bus, judges whether the voltage deviation amount of the DC bus is more than dead zone threshold value；
If so, export the deviation of the voltage deviation amount and the dead zone threshold value of the DC bus, and by the deviation
Value is multiplied by proportionality coefficient, obtains current deviation amount；If it is not, it is zero then to export the deviation；
The value that the current inner loop reference value subtracts the current measurement value and the current deviation amount of the photovoltaic panel is calculated, is obtained
The current reference value of the photovoltaic panel；
The current reference value is converted into duty cycle signals, so that the photovoltaic generating system is according to the duty cycle signals control
Make the stabilization of the DC bus-bar voltage.
2. the fault ride-through method of photovoltaic generating system as described in claim 1, which is characterized in that the acquisition photovoltaic panel
Voltage deviation amount and current measurement value specifically include：
The voltage measuring value and current measurement value for obtaining photovoltaic panel, the voltage reference value of photovoltaic panel is obtained by MPPT controller；
The voltage difference of the voltage reference value of photovoltaic panel and the voltage measuring value of photovoltaic panel is calculated, the voltage for obtaining the photovoltaic panel is inclined
Residual quantity.
3. the fault ride-through method of photovoltaic generating system as described in claim 1, which is characterized in that the acquisition DC bus
Voltage deviation amount specifically include：
The voltage reference value and voltage measuring value for obtaining DC bus, the voltage reference value and voltage for calculating the DC bus are surveyed
The voltage difference of magnitude obtains the voltage deviation amount of the DC bus.
4. a kind of fault traversing device, which is characterized in that it is suitable for photovoltaic generating system, including：
The voltage deviation amount is converted to electricity by first voltage outer shroud control module, the voltage deviation amount for obtaining photovoltaic panel
Flow inner ring reference value；
Second voltage outer shroud control module, the voltage deviation amount for obtaining DC bus, judges the voltage of the DC bus
Whether departure is more than dead zone threshold value；If so, exporting the voltage deviation amount of the DC bus and the dead zone threshold value
Deviation, and the deviation is multiplied by proportionality coefficient, obtains current deviation amount；If it is not, it is zero then to export the deviation；
Current inner loop control module, the current measurement value for obtaining photovoltaic panel are additionally operable to calculate the current inner loop reference value
The value for subtracting the current measurement value and the current deviation amount of the photovoltaic panel, obtains the current reference value of the photovoltaic panel；
Auxiliary direct current presses control module, for the current reference value to be converted to duty cycle signals, so that the photovoltaic is sent out
Electric system controls the stabilization of the DC bus-bar voltage according to the duty cycle signals.
5. fault traversing device as claimed in claim 4, which is characterized in that the fault traversing device further includes MPPT controls
Device, the MPPT controller are used to obtain the voltage measuring value and current measurement value of photovoltaic panel, and according to the electricity of the photovoltaic panel
Pressure measured value and current measurement are worth to the voltage reference value of the photovoltaic panel.
6. fault traversing device as claimed in claim 5, which is characterized in that the first voltage outer shroud control module includes the
One comparator and the first PI controllers；Wherein,
The first comparator is used to calculate the voltage difference of the voltage reference value of photovoltaic panel and the voltage measuring value of photovoltaic panel, obtains
The voltage deviation amount of the photovoltaic panel；
The first PI controllers are used to the voltage deviation amount being converted to current inner loop reference value.
7. fault traversing device as claimed in claim 4, which is characterized in that the second voltage outer shroud control module includes the
Two comparators and proportional component controller；Wherein,
Second comparator is used to obtain the voltage deviation amount of DC bus, judges that the voltage deviation amount of the DC bus is
It is no to be more than dead zone threshold value；If so, exporting the deviation of the voltage deviation amount and the dead zone threshold value of the DC bus；
If it is not, it is zero then to export the deviation；
The proportional component controller is used to the deviation being multiplied by proportionality coefficient, obtains current deviation amount.
8. fault traversing device as claimed in claim 4, which is characterized in that the current inner loop control module includes third ratio
Compared with device, the third comparator is used to obtain the current measurement value of photovoltaic panel, is additionally operable to calculate the current inner loop reference value and subtracts
The value for removing the current measurement value and the current deviation amount of the photovoltaic panel, obtains the current reference value of the photovoltaic panel.
9. fault traversing device as claimed in claim 4, which is characterized in that auxiliary direct current pressure control module includes the
Two PI controllers, the 2nd PI controllers are used to the current reference value being converted to duty cycle signals, so that the photovoltaic
Electricity generation system controls the stabilization of the voltage of the DC bus according to the duty cycle signals.
10. a kind of photovoltaic generating system, which is characterized in that including：Photovoltaic panel, DC booster converter, DC-AC conversion
Fault traversing described in any one of device, DC-AC controller, transformer, AC network and the claims 4 to 9
Device；Wherein,
The photovoltaic panel is for converting light energy into DC voltage；The DC booster converter be used for the DC voltage into
Row boosting；The direct-current-alternating-current converter is used to the DC voltage after boosting being converted to alternating voltage；The transformer is used for
It boosts to the alternating voltage, to which the alternating voltage after boosting imports in input AC power grid；The DC-AC
Controller is used to control the work of the direct-current-alternating-current converter；
The fault traversing device is for controlling the DC booster converter, when the direct current of DC booster converter output
When busbar voltage is more than the dead zone threshold value in the fault traversing device, the fault traversing device output duty cycle signal,
So that stabilization of the DC booster converter according to the DC bus-bar voltage of duty cycle signals control output.
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