CN104600725B - photovoltaic series compensation system - Google Patents
photovoltaic series compensation system Download PDFInfo
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- CN104600725B CN104600725B CN201310533488.XA CN201310533488A CN104600725B CN 104600725 B CN104600725 B CN 104600725B CN 201310533488 A CN201310533488 A CN 201310533488A CN 104600725 B CN104600725 B CN 104600725B
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- 238000004146 energy storage Methods 0.000 claims abstract description 104
- 238000010248 power generation Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 210000004027 cell Anatomy 0.000 description 11
- 210000003850 cellular structure Anatomy 0.000 description 9
- 230000005611 electricity Effects 0.000 description 9
- 239000003990 capacitor Substances 0.000 description 5
- 239000004065 semiconductor Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
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- 238000011105 stabilization Methods 0.000 description 1
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Classifications
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H02J3/385—
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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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- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Power Engineering (AREA)
- Inverter Devices (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention provides a kind of photovoltaic series compensation system, including dc bus, electric capacity, inverter, transformer, wave filter, exchange energy-storage system and energy storage control device, one end of the primary side of transformer is electrically connected with the output end of inverter；Wave filter has the output end for forming the input of continuous current circuit with the primary side of transformer and the output end of inverter and being connected in parallel on power network；Exchanging energy-storage system includes energy storage device and energy storage converting means；Energy storage control device is used to detect the voltage and current on dc bus, when the voltage on dc bus is higher than predetermined higher limit or less than predetermined lower limit, energy storage control device controls energy storage converting means to provide dynamic offset voltage to the output voltage of inverter to energy storage device charge or discharge according to the voltage and current on dc bus so that photovoltaic power generation apparatus works in maximum power point.The photovoltaic series compensation system of the present invention can expand peak power point range, while having compensation of line voltage and energy-storage function.
Description
Technical field
The present invention relates to field of photovoltaic power generation, and in particular to a kind of photovoltaic series compensation system.
Background technology
In solar grid-connected electricity generation system, how to increase the power output of solar cell, make full use of solar energy, carry
The generating efficiency of high whole solar grid-connected electricity generation system has great importance.
By the research to solar cell characteristics of output power, find solar cell power output and intensity of illumination and
The relating to parameters such as environment temperature, work near maximum output power point in order that obtaining grid-connected photovoltaic system, use at present
More MPPT maximum power point tracking（MPPT）, by changing the output voltage of solar cell, so as to realize solar cell most
High-power output.
A kind of photovoltaic DC-to-AC converter and control method are disclosed in Chinese patent application publication No. CN102723740A, is adopted
It can quickly be tracked with the MPPT control strategies in the patent application and change violent photoenvironment, improve the defeated of solar cell
Go out power.
In current grid-connected photovoltaic system, if the maximum power point of the grid-connected photovoltaic system（MPP）Model
It is 450 volt of -1000 volt to enclose, if on the one hand larger in the environmental change of some area or some period so that photovoltaic cell
Maximum power point at 400 volts（It is less than the lower limit of peak power point range）, it is now inverse in grid-connected photovoltaic system
Become device and will be unable to work, so as to can not export the electric energy that photovoltaic cell is produced into power network, this part solar energy can only be wasted,
Causing the utilization ratio of solar energy reduces.On the other hand when the output voltage of photovoltaic cell is 450 volts, if in maximum modulation
The line voltage virtual value of the alternating current of the output end of inverter is under degree, about 180 volts, in order to the stabilization of power grids
500kW power output is provided, now AC phase currents virtual value is up to 910 peaces, it is therefore necessary to which selection bears electric current 910
Pacify the semiconductor switch pipe of the above, this greatly wastes the electric current selection capacity of switching tube.Meanwhile, photovoltaic panel open-circuit voltage
Limitation, causes the voltage of semiconductor switch pipe to reach the highest voltage of photovoltaic panel, it is assumed that peak power point range is again
450V-1000V, then switching device voltage should be not less than 1000V, but practical devices selection is nominal 1700V.Greatly waste
The voltage selection capacity of switching tube.Therefore delivery efficiency and utilization rate of solar cell etc. are not solved fundamentally at present
Problem.
The content of the invention
For above-mentioned prior art, the present invention is intended to provide a kind of photovoltaic series compensation system, including：
Dc bus, including positive terminal and negative terminal, the positive terminal and negative terminal are used for and photovoltaic generation
The output end electrical connection of device；
Electric capacity, the electric capacity is connected electrically between the positive terminal and negative terminal；
Inverter, the input of the inverter is electrically connected between the positive terminal and negative terminal；
Transformer, the transformer has a primary side and secondary side, one end of the primary side of the transformer with it is described inverse
Become the output end electrical connection of device；
Wave filter, the wave filter has the output end formation afterflow with the primary side and the inverter of the transformer
The input in loop and the output end being connected in parallel on power network；
Energy-storage system is exchanged, the exchange energy-storage system includes energy storage device and energy storage converting means, the energy storage device
The secondary side of the transformer is connected to by the energy storage converting means；
Energy storage control device, the energy storage control device is used to detect the voltage and current on the dc bus, works as institute
When stating the voltage on dc bus higher than predetermined higher limit, the energy storage control device is according to the voltage on the dc bus
The energy storage device is charged with energy storage converting means described in current control, so as to provide dynamic for the output voltage of the inverter
State offset voltage so that the photovoltaic power generation apparatus works in maximum power point, when the voltage on the dc bus is less than pre-
During fixed lower limit, the energy storage control device controls the energy storage to become to change the outfit according to the voltage and current on the dc bus
Put and the energy storage device is discharged, so as to provide dynamic offset voltage for the output voltage of the inverter so that the photovoltaic
TRT works in maximum power point.
The photovoltaic series compensation system of the present invention improves the peak power point range of photovoltaic power generation apparatus, causes in theory
The peak power point range of photovoltaic power generation apparatus is from the open-circuit voltage more than zero to photovoltaic power generation apparatus.Solved with compensation of line voltage
Low voltage ride-through capability problem, while have energy-storage function.Improve the utilization rate of solar energy.
It is preferred that, the energy storage control device controls the inverter in efficiency highest modulation degree operated within range.Energy
Enough improve the utilization rate of semiconductor switch device in inverter.
It is preferred that, when the voltage on the dc bus is higher than predetermined higher limit, the energy storage control device control
The inverter works under the first modulation degree in the range of the efficiency highest modulation degree；And when on the dc bus
Voltage when being less than predetermined lower limit, the energy storage control device controls the inverter in the efficiency highest modulation degree
In the range of the second modulation degree under work, first modulation degree and second modulation degree are unequal.It is furthermore preferred that described
One modulation degree is the lower limit in the range of efficiency highest modulation degree, and second modulation degree is efficiency highest modulation degree scope
Interior higher limit.Higher limit or lower limit work of the inverter in the range of efficiency highest modulation degree, can effectively reduce
Dynamic offset voltage value, reduces the loss of semiconductor switch device in inverter.
It is preferred that, the inverter is full-bridge inverter, including is connected in parallel between the positive terminal and negative terminal
Three bridge arms, the full-bridge inverter has first node, Section Point and the 3rd node；The transformer includes three-phase；；Institute
It is three-phase alternating current energy-storage system to state exchange energy-storage system.By three-phase transformer and three-phase alternating current energy-storage system three are provided to power network
Cross streams electricity, meets civil power demand.
It is furthermore preferred that the wave filter is three-phase LCL filter.The cost of LCL filter is low, good wave filtering effect.
It is preferred that, the inverter is two leg inverters, and two leg inverter has fourth node and Section five
Point；The transformer is single-phase transformer, and one end of the primary side of the single-phase transformer is electrically connected with the fourth node；Institute
It is single phase ac energy-storage system to state exchange energy-storage system.The embodiment is used to provide single-phase alternating current to power network.
It is furthermore preferred that the wave filter is single-phase LCL filter.The cost of LCL filter is low, good wave filtering effect.
It is preferred that, the output end of the wave filter is connected with the primary side of the transformer in the power network.
Brief description of the drawings
The following drawings is only intended to, in doing schematic illustration and explanation to the present invention, not delimit the scope of the invention.Wherein,
Fig. 1 is the circuit diagram of the photovoltaic series compensation system according to first embodiment of the invention；
Fig. 2 is the circuit diagram of the photovoltaic series compensation system according to second embodiment of the invention.
Main device symbol description
The negative terminal of 1 positive terminal 2
3 inverters 4 exchange energy-storage system
The energy storage control device of 41 energy storage device 42
The inverter of 5 three-phase transformer 23
The 24 exchange LCL filters of energy-storage system 25
The transformer of 26 alternating electromagnetic compatible filters 27
The energy storage device of 28 energy storage control device 29
The energy storage converting means of 43 energy storage converting means 20
C1-C5 electric capacity
T1-T10 insulated gate bipolar transistors
Tr1-Tr4 transformers
L1, L2 inductance
Embodiment
In order to which technical characteristic, purpose and effect to the present invention are more clearly understood from, now control illustrates this hair
Bright embodiment.
Fig. 1 is the circuit diagram of the photovoltaic series compensation system according to first embodiment of the invention.As shown in figure 1, the light
Lie prostrate the positive terminal 1 and negative terminal 2 of series compensation system including dc bus, electric capacity C1, inverter 3, transformer U phases Tr1,
Transformer V phases Tr2, transformer W phases Tr3, filter capacitor C2, filter capacitor C3, filter capacitor C4, exchange energy-storage system 4 and storage
Can control device 42.Positive terminal 1 and negative terminal 2 are used for connecting photovoltaic power generation apparatus（Not shown in figure）Output end, electricity
Two terminals for holding C1 are respectively connecting on positive terminal 1 and negative terminal 2, and photovoltaic power generation apparatus changes the solar energy of acquisition
To be exported after direct current to electric capacity C1.Inverter 3 is the photovoltaic DC-to-AC converter that full-bridge inverter also can be other forms, such as more electric
Flat inverter etc., wherein, full-bridge inverter includes three bridge arms being connected in parallel between positive terminal 1 and negative terminal 2, wherein often
All there are two insulated gate bipolar transistors of series connection on one bridge arm.Have insulated gate bipolar brilliant on first bridge arm
Body pipe T1 and insulated gate bipolar transistor T2, wherein insulated gate bipolar transistor T1 and insulated gate bipolar transistor T2 it
Between have node N1.There is insulated gate bipolar transistor T3 and insulated gate bipolar transistor T4 on the second bridge arm, wherein
There is node N2 between insulated gate bipolar transistor T3 and insulated gate bipolar transistor T4.Have on the 3rd bridge arm exhausted
Edge grid bipolar transistor T5 and insulated gate bipolar transistor T6, wherein insulated gate bipolar transistor T5 and insulated gate bipolar
There is node N3 between transistor npn npn T6.In the present embodiment, inverter 3 can be by control method of the prior art by electricity
Hold the direct current on C1 and be converted to exchange electricity output, and cause the angle of each mutually conduction of three-phase electricity to differ 120 °, positive terminal
Son 1 and the input that negative terminal 2 is inverter 3, node N1, node N2 and node N3 are the output end of inverter 3.At other
Embodiment in, to be constituted full-bridge inverse for the insulated gate bipolar transistor that can be replaced with metal-oxide half field effect transistor in the present embodiment
Become device.Transformer U phases Tr1 primary side has terminal U1 and terminal U2, terminal U1 and node N1 connections.Transformer V phases Tr2's
Primary side has terminal V1 and terminal V2, terminal V1 and node N2 electrical connections.Transformer W phases Tr3 primary side has terminal W1
With terminal W2, terminal W1 and node N3 connection.Wherein transformer U phases Tr1, transformer V phases Tr2 and transformer W phases Tr3's is secondary
Side is electrically connected with energy-storage system 4 is exchanged, in the present embodiment, and exchange energy-storage system 4 mainly includes energy storage device 41 and energy storage becomes
Changing device 43, one end of energy storage converting means 43 and the three-phase Tr1-Tr3 of transformer secondary side connection, energy storage converting means 43
The other end and energy storage device 41 connect, in an embodiment of the present invention, energy storage converting means 43 can include ac/dc become
Parallel operation and DC to DC converter, for controlling the charge or discharge of energy storage device 41.Energy storage control device 42 is used to detect electric capacity
The electric current in voltage and dc bus on C1, and according to the modulation degree of the voltage control inverter 3 on electric capacity C1 so that inversion
Device 3 is in efficiency highest modulation degree operated within range, while energy storage control device 42 can also be according to the voltage on electric capacity C1 and straight
The electric current flowed in bus provides dynamic offset voltage to the output end of inverter 3 so that photovoltaic power generation apparatus is in peak power point
Work, in other embodiments of the invention, the power that energy storage control device 42 can also be exported according to photovoltaic power generation apparatus is to inverse
The output end for becoming device 3 provides dynamic offset voltage so that photovoltaic power generation apparatus works in peak power point.Electric capacity C2, electric capacity C3
With electric capacity C4 connections triangular in shape, i.e. electric capacity C2, electric capacity C3 and electric capacity C4 connections are annular in shape.Electric capacity C2 and electric capacity C4 node with
The terminal U2 connections of transformer U phases Tr1 primary side, electric capacity C2 and electric capacity C3 node and transformer V phases Tr2 primary side
Terminal V2 connections, electric capacity C3 and C4 node is connected with the terminal W2 of transformer W phases Tr3 primary side, while transformer U phases
Terminal U2, the terminal V2 of transformer V phases Tr2 primary side of Tr1 primary side and transformer W phases Tr3 primary side terminal
W2 is connected to the input of three-phase transformer 5, output end and the power network connection of three-phase transformer 5.Due to actual transformer all
More or less there is leakage inductance, therefore in the present embodiment, transformer Tr1, transformer Tr2, transformer Tr3 and three-phase transformer
Electric capacity C2, electric capacity C3 and the electric capacity C4 that leakage inductance in 5 is connected with triangle constitute three-phase LCL filter, reduce first device
Part, reduces cost.
Photovoltaic power generation apparatus（Such as photovoltaic cell component）Electric energy is converted light energy into, passes through the positive terminal of dc bus
1 and negative terminal 2 by electrical power storage on electric capacity C1, energy storage control device 42 detection dc bus on voltage and dc bus
In electric current, when the voltage between the positive terminal 1 and negative terminal 2 of dc bus is between predetermined lower limit and higher limit
When, now exchange energy-storage system 4 and do not provide voltage compensation, i.e. energy storage device 41 without any charge and discharge process, energy storage control
Device 42 controls inverter 3 according to conventional photovoltaic inverter control mode, and causes inverter 3 in efficiency highest modulation degree
Operated within range, so that photovoltaic cell component is operated in maximum power point, the electric energy that now photovoltaic cell component is produced can
Directly to export into power network.Wherein higher limit predetermined in the photovoltaic series compensation system and lower limit are according to line voltage
Determined with the scope of modulation index of the inverter 3 in efficiency highest.
When the voltage between the positive terminal 1 and negative terminal 2 of dc bus is more than predetermined higher limit, now photovoltaic
The power output of battery component also can correspondingly increase, and the control inverter 3 of energy storage control device 42 is a certain solid in efficiency highest
Worked under system of setting the tone, for example, cause lower limit work of the inverter 3 in the range of efficiency highest modulation degree, and pass through vector
The dynamic offset voltage vector of Injection Current vector that control methods control is injected into power network, while so that Injection Current vector
Dynamic offset voltage vector it is in opposite direction, now energy storage control device 42 by control energy storage converting means 43 so that energy storage fill
41 charging energy-storings are put, energy storage control device 42 controls the charged state of energy storage device 41 according to the voltage and current on dc bus
Output end to inverter 3 provides a dynamic offset voltage, so that photovoltaic cell component is operated in maximum power point.
When the voltage between the positive terminal 1 and negative terminal 2 of dc bus is less than predetermined lower limit, now photovoltaic
The power output of battery component also can be reduced correspondingly.The control inverter 3 of energy storage control device 42 is a certain solid in efficiency highest
Worked under system of setting the tone, for example, cause higher limit work of the inverter 3 in the range of efficiency highest modulation degree, and pass through vector
Control methods control exchange energy-storage system 4 provides a dynamic offset voltage vector, and the dynamic offset voltage vector is with being injected into electricity
In the same direction, now energy storage control device 42 is by controlling energy storage converting means 43 so that energy storage device 41 starts for current phasor in net
Electric discharge, energy storage control device 42 controls the discharge condition of energy storage device 41 to inverter according to the voltage and current on dc bus
3 output end provides a dynamic offset voltage, so that photovoltaic cell component is operated in maximum power point.
Compared to the prior art in background technology, when the output voltage of the photovoltaic cell component in the present invention is very low or
Far below during DC voltage, now inverter remains able to normal work, and causes photovoltaic cell group needed for grid-connected inverters
Part is operated in maximum power point, so as to get up and export into power network this part Solar use.Therefore, photovoltaic of the invention
Series compensation system causes photovoltaic power generation apparatus in theory（Or photovoltaic cell component）Peak power point range from 0 volt to light
Lie prostrate the open-circuit voltage of TRT.Meanwhile, the maximum working voltage of the insulated gate bipolar transistor of the inverter in the present invention
And maximum operating currenbt can be reduced, devices use rate is improved, it is not necessary to which selection can bear the insulated gate bipolar of more high current
Transistor or other semiconductor switch pipes, so reduce equipment cost.In addition, the photovoltaic series compensation system of the present invention has
Compensation of line voltage and energy-storage function, while solving the problem of low voltage crossing and grid-connected energy storage.
Fig. 2 is the circuit diagram of the photovoltaic series compensation system according to second embodiment of the invention.As shown in Fig. 2 the light
Lie prostrate positive terminal 1 and negative terminal 2 of the series compensation system including dc bus, electric capacity C1, inverter 23, transformer Tr4, storage
Can control device 28, exchange energy-storage system 24 and LCL filter 25.Wherein inverter 23 is two leg inverters, including parallel connection
There are two insulated gate bipolar crystalline substances of series connection on two bridge arms between positive terminal 1 and negative terminal 2, each bridge arm
Body pipe.There is insulated gate bipolar transistor T7 and insulated gate bipolar transistor T8, wherein insulated gate on first bridge arm
There is node N4 between bipolar transistor T7 and insulated gate bipolar transistor T8.There is insulated gate bipolar on the second bridge arm
Transistor npn npn T9 and insulated gate bipolar transistor T10, wherein insulated gate bipolar transistor T9 and insulated gate bipolar crystal
There is node N5 between pipe T10.Transformer Tr4 primary side has terminal 21 and terminal 22, terminal 21 and node N4 connections, becomes
Depressor Tr4 secondary side is connected with exchange energy-storage system 24, and exchange energy-storage system 24 includes energy storage device 29 and energy storage change changes the outfit
20 are put, energy storage device 29 is connected to transformer Tr4 secondary side by energy storage converting means 20.One of them of LCL filter
Filter inductance L1 one end and terminal 22 are connected, filter capacitor C5 one end and node N5 connections, and the one of filter inductance L1
End and filter capacitor C5 one end constitute transformer Tr4 continuous current circuit as input.Filter inductance L2 one end
As the output end of LCL filters, it is connected by alternating electromagnetic compatible filters 26 with the transformer 27 of power network side, so as to give
Power network provides power output.In one embodiment, it can also be connected between the input of filter and three-phase transformer 5
There are alternating electromagnetic compatible filters.The photovoltaic series compensation system of the present embodiment can photovoltaic cell component output voltage it is low
When predetermined lower limit, also inverter 23 can be caused to work, so that the solar energy that photovoltaic cell component is produced is exported to electricity
It is identical in its operation principle and Fig. 1 in net, it will not be repeated here.
In the above embodiment of the present invention, direct current can also be connected on positive terminal 1 and negative terminal 2
Magnetic Compatibility filter.In other embodiments of the invention, inverter is not limited to the full-bridge inverter 3 shown in Fig. 1 and Fig. 2 institutes
Two leg inverters 23 shown, can also be other inverters by converting direct-current power into alternating-current power.Filtering in the present invention
Device 25 can be LCL filter, and wherein two in LCL filter filter inductance can borrow the leakage inductance in transformer,
The leakage inductance composition LCL filter in transformer is borrowed as shown in Figure 1, so as to reduce component and cost.Shown in Fig. 1
In wave filter, electric capacity C2, electric capacity C3 and electric capacity C4 can also be Y-connection.In other examples, wave filter can be with
It is LC wave filters.
It should be understood that, although this specification is described according to each embodiment, but not each embodiment only includes one
Individual independent technical scheme, this narrating mode of specification is only that for clarity, those skilled in the art will should say
Bright book is as an entirety, and the technical solutions in the various embodiments may also be suitably combined, and forming those skilled in the art can be with
The other embodiment of understanding.
Schematical embodiment of the invention is the foregoing is only, the scope of the present invention is not limited to.It is any
Those skilled in the art, the equivalent variations made on the premise of the design of the present invention and principle is not departed from, modification and combination,
The scope of protection of the invention all should be belonged to.
Claims (8)
1. a kind of photovoltaic series compensation system, it is characterised in that including：
Dc bus, including positive terminal and negative terminal, the positive terminal and negative terminal are used for and photovoltaic power generation apparatus
Output end electrical connection；
Electric capacity, the electric capacity is connected electrically between the positive terminal and negative terminal；
Inverter, the input of the inverter is electrically connected between the positive terminal and negative terminal；
Transformer, the transformer has primary side and secondary side, one end of the primary side of the transformer and the inverter
Output end electrical connection；
Wave filter, the wave filter has the output end formation continuous current circuit of the primary side and the inverter with the transformer
Input and the output end that is connected in parallel on power network；
Energy-storage system is exchanged, the exchange energy-storage system includes energy storage device and energy storage converting means, and the energy storage device passes through
The energy storage converting means is connected to the secondary side of the transformer；
Energy storage control device, the energy storage control device is used to detect the voltage and current on the dc bus, when described straight
When flowing the voltage on bus higher than predetermined higher limit, the energy storage control device controls the inverter to be adjusted in efficiency highest
Lower limit work in system range, and control the Injection Current vector being injected into power network dynamically to mend by vector control method
Voltage vector is repaid, while so that in opposite direction, the energy storage control device of Injection Current vector dynamic offset voltage vector
The energy storage converting means is controlled to charge the energy storage device according to the voltage and current on the dc bus, so as to be institute
The output voltage for stating inverter provides dynamic offset voltage so that the photovoltaic power generation apparatus works in maximum power point, works as institute
When stating the voltage on dc bus less than predetermined lower limit, the energy storage control device controls the inverter in efficiency highest
Modulation degree in the range of higher limit work, and by vector control method control it is described exchange energy-storage system provide one dynamic mend
Voltage vector is repaid, the dynamic offset voltage vector and the current phasor being injected into power network are in the same direction, the energy storage control device root
The energy storage converting means is controlled to discharge the energy storage device according to the voltage and current on the dc bus, so as to be described
The output voltage of inverter provides dynamic offset voltage so that the photovoltaic power generation apparatus works in maximum power point.
2. photovoltaic series compensation system according to claim 1, it is characterised in that the energy storage control device control is described
Inverter is in efficiency highest modulation degree operated within range.
3. photovoltaic series compensation system according to claim 2, it is characterised in that
When the voltage on the dc bus is higher than predetermined higher limit, the energy storage control device controls the inverter to exist
Worked under the first modulation degree in the range of the efficiency highest modulation degree；And
When the voltage on the dc bus is less than predetermined lower limit, the energy storage control device controls the inverter to exist
Worked under the second modulation degree in the range of the efficiency highest modulation degree, first modulation degree and second modulation degree are not
It is equal.
4. photovoltaic series compensation system according to claim 3, it is characterised in that first modulation degree is the efficiency
Lower limit in the range of highest modulation degree, second modulation degree is the upper limit in the range of the efficiency highest modulation degree
Value.
5. the photovoltaic series compensation system according to any one of Claims 1-4, it is characterised in that
The inverter is full-bridge inverter, including three bridge arms being connected in parallel between the positive terminal and negative terminal, institute
Stating full-bridge inverter has first node, Section Point and the 3rd node；With
The exchange energy-storage system is three-phase alternating current energy-storage system.
6. photovoltaic series compensation system according to claim 5, it is characterised in that the wave filter filters for three-phase LCL
Device.
7. the photovoltaic series compensation system according to any one of Claims 1-4, it is characterised in that
The inverter is two leg inverters, and two leg inverter has fourth node and the 5th node；
The transformer is single-phase transformer, and one end of the primary side of the single-phase transformer is electrically connected with the fourth node；
The exchange energy-storage system is single phase ac energy-storage system.
8. photovoltaic series compensation system according to claim 7, it is characterised in that the wave filter filters for single-phase LCL
Device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310533488.XA CN104600725B (en) | 2013-10-31 | 2013-10-31 | photovoltaic series compensation system |
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| CN201310533488.XA CN104600725B (en) | 2013-10-31 | 2013-10-31 | photovoltaic series compensation system |
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| CN104600725A CN104600725A (en) | 2015-05-06 |
| CN104600725B true CN104600725B (en) | 2017-09-29 |
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