CN106786741A - A kind of photovoltaic energy storage grid-connecting apparatus and control method for traction power supply - Google Patents
A kind of photovoltaic energy storage grid-connecting apparatus and control method for traction power supply Download PDFInfo
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Classifications
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- H02J3/383—
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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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- 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
- H02J3/30—Arrangements for balancing of the load in a network by storage of energy using dynamo-electric machines coupled to flywheels
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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
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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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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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention discloses a kind of photovoltaic energy storage grid-connecting apparatus and control method for traction power supply, and photovoltaic energy storage grid-connecting apparatus include photovoltaic array, three-phase photovoltaic inverter, energy storage device, three-phase energy accumulation current converter, two-phase triphase step-down transformer.Photovoltaic system power output can be supplied directly to traction load in the present invention, counter can also send power system back to obtain income, energy-storage system can carry out discharge and recharge according to instruction, by the discharge and recharge of reasonable arrangement energy-storage system, influence of the access of photovoltaic system to tractive power supply system and to power system can significantly be mitigated, the stability of tractive power supply system and power system is strengthened.
Description
Technical field
The invention belongs to traction power supply technical field, the grid-connected dress of more particularly to a kind of photovoltaic energy storage for traction power supply
Put and control method.
Background technology
By 2015 years, China railways 12.1 ten thousand kilometers of mileage of operation, to the year two thousand twenty, railway network scale is up to 150,000
Kilometer, the whole industry year power consumption will be up to 40,000,000,000 kilowatt hours, equivalent to 16,000,000,000 kilograms of standard coals of consumption, CO2 emission every year
About 40,000,000,000 kilograms, about 1,200,000,000 kilograms of sulfur dioxide (SO2) emissions, about 600,000,000 kilograms of discharged nitrous oxides；Wherein, more than 60% power consumption
Amount and pollutant emission are caused by railway traction power supply system.
The atmosphere pollution triggered by the energy consumption structure based on the fossil energies such as coal and energy security problem,
Widely have influence on the sustainable development of environmental quality and economic society.Therefore, solar power generation, wind-power electricity generation and hydroelectric generation
Railway traction power supply system is accessed etc. regenerative resource, there is important meaning to the emission reduction of China railways energy saving of system and sustainable development
Justice.
Photovoltaic generation have cleaning, pollution-free, noiseless, scale can structure the features such as, be solution energy crisis optimal choosing
One of select.Railway enterprises are in large scale, possess substantial amounts of station house, storehouse, real estate etc., if these facilities at utmost
Use, Devoting Major Efforts To Developing distributed photovoltaic power generation project, you can save substantial amounts of electric cost, country can be taken again and is given
Generating subsidy, prospect is considerable.
The energy source of photovoltaic generating system is solar energy, and the trend of change at random is presented with the time for intensity of illumination, this
The power output for having resulted in photovoltaic generating system has uncertainty.Therefore, photovoltaic generating system often with energy-storage system knot
Conjunction is used, and the effect of energy-storage system is to carry out " peak load shifting " to the power output of photovoltaic generating system random fluctuation, so that
Stabilize the power of absorption or the output of whole system, it is to avoid unstable situation occurs in system.
In the new energy market of current China, 3-phase power converter is occupied predominantly greatly because of its strong adaptability, capacity
Position, including three-phase photovoltaic inverter and three-phase energy accumulation current converter.Tractive power supply system is one for power system
Kind unbalanced load, general tractive power supply system can be by the phase transformer of three-phase-two by the three-phase in power system
What voltage conversion was powered for two-phase voltage to the single-phase load on two supply arms.For the photovoltaic energy storage system of three-phase
For, it is also possible to it is linked into tractive power supply system by the two-phase-three-phase transformer for matching.
In current China's tractive power supply system, the conventional phase transformer of three-phase-two include V-type Connection Traction Transformer,
YNd11 Connection Traction Transformers, Scott Connection Traction Transformers and balanced impedance matching transformer etc., wherein V-type wiring draw
The secondary side two-phase voltage of transformer and YNd11 Connection Traction Transformers is in 60 ° of angles, Scott Connection Traction Transformers and resistance
The secondary side two-phase voltage of anti-matching balancing transformer is in 90 ° of angles.Corresponding two-phase-three-phase transformer becomes including V-type wiring
Depressor, YNd11 wiring transformers, Dyn11 wiring transformers, inverse Scott connection transformer etc., wherein V-type wiring transformer,
The primary side two-phase voltage of YNd11 wiring transformers and Dyn11 wiring transformers is in 60 ° of angles, inverse Scott connection transformer
Primary side two-phase voltage be in 90 ° of angles.
But, it is a kind of fluctuation, asymmetric two phase load for power system due to traction load, and light
The electric current that volt system three-phase is exported after accessing is symmetrical all the time, if only photovoltaic system three-phase accesses tractive power supply system, easily
Decline whole tractive power supply system asymmetry aggravation, power factor for power system, or even in power system side
The opposite situation of trend between appearance difference is separate.In this case, it is possible to two kinds of results occur：One, power system cannot
The anti-unqualified electric energy for sending of tractive power supply system is received, the economic loss of photovoltaic system investor is caused；Two, power system connects
Receive unqualified electric energy, but because the increase of asymmetric electric current, power factor decline, the safety and stability fortune of power system may be endangered
OK.
The content of the invention
In order to solve the above problems, the present invention proposes a kind of for the photovoltaic energy storage grid-connecting apparatus of traction power supply and control
Method, photovoltaic system power output can be supplied directly to traction load, it is also possible to counter to send power system back to obtain income, storage
Energy system can carry out discharge and recharge according to instruction, by the discharge and recharge of reasonable arrangement energy-storage system, can significantly mitigate photovoltaic system
Influence of the access to tractive power supply system and to power system, strengthen the stability of tractive power supply system and power system.
To reach above-mentioned purpose, the technical solution adopted by the present invention is：
A kind of photovoltaic energy storage grid-connecting apparatus for traction power supply, including photovoltaic array, three-phase photovoltaic inverter, energy storage dress
Put, three-phase energy accumulation current converter, two-phase-triphase step-down transformer；
On high-tension side three ports of two-phase-triphase step-down transformer and external connection；Wherein, two ports are respectively connecting to
Two buses of supply arm of tractive power supply system, another port is connected to the rail of tractive power supply system, rail connection earth mat；
The AC of the three-phase photovoltaic inverter and three-phase energy accumulation current converter is connected in parallel, and be commonly connected to two-phase-
The low-pressure side of triphase step-down transformer；
The DC side connection photovoltaic array of the three-phase photovoltaic inverter；The DC side connection of the three-phase energy accumulation current converter
Energy storage device.
It is further that the photovoltaic array is made up of the connection in series-parallel of photovoltaic module, photovoltaic module in photovoltaic array
Serial number and number in parallel combine nominal power, the capacity of three-phase photovoltaic inverter, the tractive power supply system of single photovoltaic module
Power demand, support cost and direct current cable into original determine；Universal performance is strong.
It is further that the three-phase photovoltaic inverter is that a kind of direct current energy by photovoltaic array generation is transformed to exchange
The device of electric energy, and three-phase photovoltaic inverter of the selection with maximal power tracing function, to ensure that photovoltaic array to the greatest extent can may be used
Can more export electric energy.
It is further that the energy storage device is the equipment for realizing electrical power storage and release function, including compressed air storage
Energy, flywheel energy storage, batteries to store energy, superconducting energy storage and/or super capacitor energy-storage.
It is further that the direct current energy that energy storage device is produced is converted to AC energy by the three-phase energy accumulation current converter,
The two-way flow of electric energy is completed according to control instruction, to realize the discharge and recharge of energy storage device.
Be further, the two-phase-triphase step-down transformer be V-type wiring transformer, YNd11 wiring transformers,
Dyn11 wiring transformers or inverse Scott connection transformer；Suitable for existing general tractive transformer.
It is further, in grid-connecting apparatus and the bus junction of two supply arms of tractive power supply system, to be also connected in parallel
The primary side of tractive transformer, the secondary side of the tractive transformer is connected to electric power networks.
It is further that the selection of the two-phase-triphase step-down transformer determines according to the structure of tractive transformer.
It is further, when tractive transformer is V-type Connection Traction Transformer or YNd11 Connection Traction Transformers, institute
Two-phase-triphase step-down transformer is stated for V-type wiring transformer, YNd11 wiring transformers or Dyn11 wiring transformers；Work as traction
When transformer is Scott Connection Traction Transformers or balanced impedance matching transformer, the two-phase-triphase step-down transformer is inverse
Scott connection transformer.
On the other hand, present invention also offers a kind of photovoltaic energy storage grid-connected control method for traction power supply, its feature
It is, including step：
The power output of real-time detection Photovoltaic array and the demand power of traction load；
When without traction load or during smaller traction load, Photovoltaic array output electric energy is used for tractive power supply system, and surplus
Remaining electric energy leads to electric power networks, and energy storage device determines discharge power according to state-of-charge；
When traction load is larger, the electric energy of Photovoltaic array output supplies tractive power supply system or is stored in energy storage system simultaneously
In system, if energy storage device state-of-charge reaches the upper limit and photovoltaic is exerted oneself more than traction load, Photovoltaic array exits power supply.
Using the beneficial effect of the technical program：
A kind of tractive power supply system photovoltaic energy storage grid-connecting apparatus based on 3-phase power converter, photovoltaic system is with energy-storage system
Be connected in parallel, by the discharge and recharge of reasonable arrangement energy-storage system, can mitigate significantly the access of photovoltaic system to tractive power supply system,
Influence to power system, and ensure that the anti-electric energy for sending power system back to of photovoltaic system meets and network electric energy quality requirement.
Photovoltaic system power output can be supplied directly to traction load, it is also possible to counter to send power system back to be received
Benefit, energy-storage system can carry out discharge and recharge according to instruction, by the discharge and recharge of reasonable arrangement energy-storage system, can significantly mitigate photovoltaic
Influence of the access of system to tractive power supply system and to power system, strengthens the stabilization of tractive power supply system and power system
Property.
Actual condition given threshold according to application place simultaneously formulates the switchover policy of mode of operation, it is to avoid because of traction load
Strong fluctuation cause the mode of operation frequent switching of photovoltaic energy storage system.
Brief description of the drawings
Fig. 1 is a kind of topological structure schematic diagram of photovoltaic energy storage grid-connecting apparatus for traction power supply of the invention；
Fig. 2 is a kind of photovoltaic energy storage grid-connecting apparatus for traction power supply and tractive power supply system in the embodiment of the present invention
External cabling form schematic diagram；
Fig. 3 is a kind of photovoltaic energy storage grid-connected control method flow chart for traction power supply in the embodiment of the present invention；
Wherein, 11 is electric power networks, and 12 is tractive transformer, and 13 and 14 are respectively two supply arms of tractive power supply system
Bus, 15 is rail, and 16 is a kind of photovoltaic energy storage grid-connecting apparatus for traction power supply；
21 is two-phase-triphase step-down transformer, and 22 is photovoltaic energy storage system；221 is photovoltaic array, and 222 is three-phase photovoltaic
Inverter, 223 is three-phase energy accumulation current converter, and 224 is energy storage device.
Specific embodiment
In order that the object, technical solutions and advantages of the present invention are clearer, the present invention is made into one below in conjunction with the accompanying drawings
Step is illustrated.
In the present embodiment, shown in Figure 1, the present invention proposes a kind of grid-connected dress of the photovoltaic energy storage for traction power supply
Put, including photovoltaic array 221, three-phase photovoltaic inverter 222, energy storage device 224, three-phase energy accumulation current converter 223, two-phase-three-phase
Step-down transformer 21；
Two-phase-triphase step-down transformer 21 on high-tension side three ports and external connections；Wherein, two ports connect respectively
To two buses of supply arm of tractive power supply system 13,14, another port is connected to the rail 15 of tractive power supply system, rail
15 connection earth mats；
The AC of the three-phase photovoltaic inverter 222 and three-phase energy accumulation current converter 223 is connected in parallel, and is commonly connected to
The low-pressure side of two-phase-triphase step-down transformer 21；
The DC side connection photovoltaic array 221 of the three-phase photovoltaic inverter 222；The three-phase energy accumulation current converter 223
DC side connects energy storage device 224.
As it is above-mentioned be embodiment prioritization scheme, the photovoltaic array 221 is made up of the connection in series-parallel of photovoltaic module,
The serial number of photovoltaic module and number in parallel combine nominal power, the three-phase photovoltaic inversion of single photovoltaic module in photovoltaic array 221
The capacity of device 222, the power demand of tractive power supply system, support cost and direct current cable are into original to be determined；Universal performance is strong.
The three-phase photovoltaic inverter 222 is a kind of the direct current energy that photovoltaic array 221 is produced to be transformed into AC energy
Device, and selection with maximal power tracing function three-phase photovoltaic inverter 222, to ensure that photovoltaic array 221 can use up
May more export electric energy.
As it is above-mentioned be embodiment prioritization scheme, the energy storage device 224 realizes electrical power storage and release function
Equipment, including compressed-air energy storage, flywheel energy storage, batteries to store energy, superconducting energy storage and/or super capacitor energy-storage.
The direct current energy that energy storage device 224 is produced is converted to AC energy by the three-phase energy accumulation current converter 223, according to control
System instruction completes the two-way flow of electric energy, to realize the discharge and recharge of energy storage device 224.
As it is above-mentioned be embodiment prioritization scheme, the two-phase-triphase step-down transformer 21 be V-type wiring transformer,
YNd11 wiring transformers, Dyn11 wiring transformers or inverse Scott connection transformer；Suitable for existing general traction voltage transformation
Device 12.
It is the prioritization scheme of embodiment as above-mentioned, as shown in Fig. 2 being supplied in grid-connecting apparatus 16 and tractive power supply system two
The junction of bus 13,14 of electric arm, is also connected in parallel the primary side of tractive transformer 12, the secondary side of the tractive transformer 12
It is connected to electric power networks 11.
The selection of the two-phase-triphase step-down transformer 21 determines according to the structure of tractive transformer 12.
When tractive transformer 12 is V-type Connection Traction Transformer or YNd11 Connection Traction Transformers, the two-phase-three
Phase step-down transformer 21 is V-type wiring transformer, YNd11 wiring transformers or Dyn11 wiring transformers；When tractive transformer 12
During for Scott Connection Traction Transformers or balanced impedance matching transformer, the two-phase-triphase step-down transformer 21 is inverse this section
Special wiring transformer.
To coordinate the realization of the inventive method, based on identical inventive concept, as shown in figure 3, present invention also offers one
Plant the photovoltaic energy storage grid-connected control method for traction power supply.
The power output of real-time detection Photovoltaic array and the demand power of traction load.
(1) mode of operation 1, when without traction load or during smaller traction load, Photovoltaic array output electric energy supplies traction power supply
System is used, and remaining electric energy leads to electric power networks, and energy storage device determines discharge power according to state-of-charge；
The component that now photovoltaic energy storage system output current reflects in the three-phase current of electric power networks side plays a leading role,
And the output current of photovoltaic energy storage system is balance and can keep power factor higher, even if it is negative to there is less traction
Lotus, asymmetry, the power factor of power system side are also able to maintain that within the scope of electric power networks can bear.
For mode of operation 1, the discharge power of energy-storage system should determine according to the SOC of energy storage device：Work as energy storage device
When SOC is larger, can be discharged with relatively high power, but discharge power no more than energy storage device maximum discharge power and
The peak power output of three-phase energy accumulation current converter；When energy storage device SOC is smaller, can be discharged with smaller power, while
The SOC for ensureing energy storage device is needed to be not less than minimum limit value.
(2) mode of operation 2, when traction load is larger, the electric energy of Photovoltaic array output supplies tractive power supply system simultaneously
Or be stored in energy-storage system, if energy storage device state-of-charge reaches the upper limit and photovoltaic is exerted oneself more than traction load, photovoltaic row
Battle array exits power supply；
The component that now traction load reflects in the three-phase current of power system side plays a leading role, if still keeping light
The high-power output of energy-storage system is lied prostrate, may cause above-mentioned to be dropped in the aggravation of power system side asymmetrical three-phase, power factor
It is low not even with the situation that trend between separate is opposite, in order to avoid the appearance of such case, photovoltaic energy storage system should be controlled not
Outwards export electric energy.
For mode of operation 2, Photovoltaic array output electric energy fully absorbed by energy-storage system, but energy-storage system charge power
Can not be more than energy storage device maximum charge power and three-phase energy accumulation current converter maximal input, it is therefore desirable to reference to should
Matching primitives are carried out to the parameter of photovoltaic system and energy-storage system with the specific meteorological condition in place.
Particularly, coefficient k is defined1、k2It is traction load and the ratio of Photovoltaic array power output, is shown below：
Sα=k1·Ppv
Sβ=k2·Ppv
Wherein Sα、SβPower respectively needed for two supply arm traction loads of tractive power supply system, PpvIt is Photovoltaic array
Power output.
Because application places of the present invention are tractive power supply system, and traction load has stronger fluctuation, in order to avoid
The frequent switching of photovoltaic energy storage system operating mode caused by traction load fluctuates, according to the actual line condition in application place,
The operating modes such as locomotive type, rate of traffic flow formulate k1、k2Threshold value and photovoltaic energy storage system mode of operation switchover policy, root
According to k1、k2The mode of operation of photovoltaic energy storage system is determined with the magnitude relationship and switchover policy of threshold value.
General principle of the invention and principal character and advantages of the present invention has been shown and described above.The technology of the industry
Personnel it should be appreciated that the present invention is not limited to the above embodiments, simply explanation described in above-described embodiment and specification this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appending claims and its
Equivalent thereof.
Claims (10)
1. a kind of photovoltaic energy storage grid-connecting apparatus for traction power supply, it is characterised in that including photovoltaic array (221), three-phase light
Volt inverter (222), energy storage device (224), three-phase energy accumulation current converter (223), two-phase-triphase step-down transformer (21)；
On high-tension side three ports of two-phase-triphase step-down transformer (21) and external connection；Wherein, two ports are respectively connecting to
Two buses of supply arm (13,14) of tractive power supply system, another port is connected to the rail (15) of tractive power supply system, steel
Rail (15) connects earth mat；
The AC of the three-phase photovoltaic inverter (222) and three-phase energy accumulation current converter (223) is connected in parallel, and is commonly connected to
The low-pressure side of two-phase-triphase step-down transformer (21)；
The DC side of the three-phase photovoltaic inverter (222) connects photovoltaic array (221)；The three-phase energy accumulation current converter (223)
DC side connect energy storage device (224).
2. a kind of photovoltaic energy storage grid-connecting apparatus for traction power supply according to claim 1, it is characterised in that the light
Photovoltaic array (221) is made up of the connection in series-parallel of photovoltaic module, the serial number of photovoltaic module and number in parallel in photovoltaic array (221)
The capacity of nominal power, three-phase photovoltaic inverter (222) with reference to single photovoltaic module, the power demand of tractive power supply system,
Support cost and direct current cable are into original to be determined.
3. a kind of photovoltaic energy storage grid-connecting apparatus for traction power supply according to claim 2, it is characterised in that described three
Phase photovoltaic DC-to-AC converter (222) is the device that the direct current energy that photovoltaic array (221) is produced is transformed to AC energy, and selects tool
There is the three-phase photovoltaic inverter (222) of maximal power tracing function.
4. a kind of photovoltaic energy storage grid-connecting apparatus for traction power supply according to claim 1, it is characterised in that the storage
Can device (224) be the equipment for realizing electrical power storage and release function, including compressed-air energy storage, flywheel energy storage, battery are stored up
Energy, superconducting energy storage and/or super capacitor energy-storage.
5. a kind of photovoltaic energy storage grid-connecting apparatus for traction power supply according to claim 4, it is characterised in that described three
The direct current energy that energy storage device (224) is produced is converted to AC energy by phase energy accumulation current converter (223), is completed according to control instruction
The two-way flow of electric energy.
6. a kind of photovoltaic energy storage grid-connecting apparatus for traction power supply according to claim 1, it is characterised in that described two
Phase-triphase step-down transformer (21) is V-type wiring transformer, YNd11 wiring transformers, Dyn11 wiring transformers or inverse this section
Special wiring transformer.
7. a kind of photovoltaic energy storage grid-connecting apparatus for traction power supply according to claim 6, it is characterised in that grid-connected
Device (16) and two bus of supply arm (13,14) junctions of tractive power supply system, are also connected in parallel tractive transformer (12)
Primary side, the secondary side of the tractive transformer (12) is connected to electric power networks (11).
8. a kind of photovoltaic energy storage grid-connecting apparatus for traction power supply according to claim 7, it is characterised in that described two
The selection of phase-triphase step-down transformer (21) determines according to the structure of tractive transformer (12).
9. a kind of photovoltaic energy storage grid-connecting apparatus for traction power supply according to claim 8, it is characterised in that work as traction
When transformer (12) is for V-type Connection Traction Transformer or YNd11 Connection Traction Transformers, the two-phase-triphase step-down transformer
(21) be V-type wiring transformer, YNd11 wiring transformers or Dyn11 wiring transformers；When tractive transformer (12) is Scott
When Connection Traction Transformer or balanced impedance matching transformer, the two-phase-triphase step-down transformer (21) is that inverse Scott connects
Line transformer.
10. a kind of photovoltaic energy storage grid-connected control method for traction power supply, it is characterised in that including step：
The power output of real-time detection Photovoltaic array and the demand power of traction load；
When without traction load or during smaller traction load, Photovoltaic array output electric energy is used for tractive power supply system, and remaining
Electric energy leads to electric power networks, and energy storage device determines discharge power according to state-of-charge；
When traction load is larger, the electric energy of Photovoltaic array output supplies tractive power supply system or is stored in energy-storage system simultaneously
In, if energy storage device state-of-charge reaches the upper limit and photovoltaic is exerted oneself more than traction load, Photovoltaic array exits power supply.
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