CN106849836A - A kind of control method of electric railway three-phase photovoltaic energy storage system - Google Patents
A kind of control method of electric railway three-phase photovoltaic energy storage system Download PDFInfo
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- 238000011897 real-time detection Methods 0.000 claims abstract description 19
- 238000009825 accumulation Methods 0.000 claims description 17
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
- H02S10/20—Systems characterised by their energy storage means
-
- 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
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
-
- 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
Abstract
The present invention discloses a kind of control method of electric railway three-phase photovoltaic energy storage system, by real-time detection tractive power supply system and the running status of photovoltaic generating system, the charge-discharge electric power of dynamically distributes energy-storage system, " peak load shifting " is carried out to photovoltaic electric energy, is realized " the generating power for their own use " of photovoltaic electric energy；Photovoltaic system is carried out abandoning light under extreme case and is rationed the power supply, it is to avoid photovoltaic accesses rear haulage electric power system and send power to power system is counter, so that the access of photovoltaic does not influence tractive power supply system safe and stable operation in itself.The present invention is remarkably improved the digestion capability to photovoltaic electric energy, simultaneously tractive power supply system can be avoided from sending power to power system is counter, fundamentally solve the Three-phase Power Flow problem not in the same direction being likely to occur when accessing tractive power supply system without energy storage photovoltaic generating system three-phase.
Description
Technical field
The invention belongs to tractive power supply system technical field, more particularly to a kind of electric railway three-phase photovoltaic energy storage system
The control method of system.
Background technology
Railway and photovoltaic generation are the two big fields that China currently greatly develops.By the end of the year 2015, China railways
Revenue kilometres have reached 12.1 ten thousand kilometers, are printed and distributed according to National Development and Reform Committee《Mid-long term railway network plan》, the railway network of China
150,000 kilometers will be reached in the year two thousand twenty, cover more than 80% big city, railway network scale will reach 17.5 ten thousand kilometers within 2025.Root
According to China's formulation in 2007《Regenerative resource Long-and Medium-term Development is planned》, the solar power generation total capacity to the year two thousand twenty China will
1,800,000 kWp are reached, and with the fast development of photovoltaic power generation technology is carried out this year, this numeral is expected to reach 100,000 MWp.
The fast development of railway and photovoltaic, for photovoltaic application is provided into opportunity in railway territory, not only contributes to improve
The accounting of new energy, while contributing to energy-saving and emission-reduction and the renewable energy utilization of railway territory, has in China's consumption energy
Good economic worth and social value.
Existing research has carried out desk study to the access form that photovoltaic generation accesses electric railway traction power supply system,
Wherein photovoltaic generation three-phase access mode three characteristics of the middle term photovoltaic DC-to-AC converter, the high-adaptability of three-phase energy accumulation current converter, Large Copacity and
With certain advantage.But after photovoltaic generation three-phase is accessed, certain negative effect can be produced to tractive power supply system：Traction is negative
Lotus is a kind of stronger load of asymmetry, and the output current three-phase symmetrical of three-phase photovoltaic inverter, this is easy for causing fortune
Three-phase Power Flow problem not in the same direction at the tie point of power system and tractive power supply system during row, to electric energy metrical, electric power
System call causes difficulty, or even the safe and stable operation for endangering power system.
The content of the invention
In order to solve the above problems, the adaptability that photovoltaic generation accesses tractive power supply system is improved, the present invention proposes one
The control method of electric railway three-phase photovoltaic energy storage system is planted, by real-time detection tractive power supply system and photovoltaic generating system
Running status, the charge-discharge electric power of dynamically distributes energy-storage system carries out " peak load shifting ", realizes photovoltaic electric to photovoltaic electric energy
" generating power for their own use " of energy；Photovoltaic system is carried out abandoning light under extreme case and is rationed the power supply, it is to avoid photovoltaic access rear haulage electric power system to
Power system is counter to send power, so that the access of photovoltaic does not influence tractive power supply system safe and stable operation in itself.
To reach above-mentioned purpose, the technical solution adopted by the present invention is：A kind of electric railway three-phase photovoltaic energy storage system
Control method, by the running status of real-time detection tractive power supply system, photovoltaic generating system and energy-storage system, so as to control
The charge-discharge electric power of energy-storage system and the running status of photovoltaic generating system, including step：
S100, the amplitude and phase of two voltage and currents of supply arm of real-time detection tractive power supply system, obtains two
The voltage phasor U of supply armαAnd Uβ, and obtain two electric current phasor I of supply armαAnd Iβ；Real-time detection tractive power supply system
The amplitude and phase of high-pressure side three-phase voltage, obtain on high-tension side three-phase voltage phasor Up、UqAnd Ur；Real-time detection photovoltaic generation
The power output P of systemPV；And the state-of-charge SOC of real-time detection energy-storage system；
S200, using two voltage phasor U of supply armαAnd UβWith electric current phasor IαAnd Iβ, calculate the real-time of traction load
Electric power, i.e. active-power PαAnd PβAnd reactive power QαAnd Qβ；
S300, using two voltage phasor U of supply armαAnd UβWith electric current phasor IαAnd Iβ, on high-tension side three-phase voltage phase
Amount Up、UqAnd Ur, and traction load real-time electric power；Traction load is calculated in reality of the high-pressure side for three-phase electrical power system
When electric power, i.e. active-power Pp、PqAnd PrAnd reactive power Qp、QqAnd Qr；
S400, real-time electric power, the power output of photovoltaic generating system and energy-storage system according to three-phase electrical power system
State-of-charge judged, so as to control charge-discharge electric power dynamically distributes and the operation of photovoltaic generating system of energy-storage system
State.
It is further in step S200, to calculate the real-time electric power of traction load, specific formula is：
Wherein, Iα *、Iβ *Two conjugate complex numbers of supply arm electric current phasor of tractive power supply system are represented respectively.
It is further in step S300, to calculate traction load in real-time electricity consumption of the high-pressure side for three-phase electrical power system
Power, specific formula is：
Wherein, Pp、Pq、PrRepresent traction load on high-tension side three phases active power, Q respectivelyp、Qq、QrRepresent respectively and lead
Draw load on high-tension side three phase reactive power, K represents the no-load voltage ratio of tractive transformer, Iα*、Iβ* tractive power supply system is represented respectively
Two conjugate complex numbers of supply arm electric current phasor.
It is further, the step S400, including step：
The minimum state-of-charge SOC that setting energy-storage system is allowedminWith highest state-of-charge SOCmax, setting energy-storage system
Maximum discharge power PfmaxWith maximum charge power Pcmax；
Take the active power minimum value min [P in the real-time electric power of three-phase electrical power systemp,Pq,Pr]；
In order to realize " peak load shifting " of photovoltaic electric energy, and avoid to the anti-power transmission energy of power system, to energy-storage system
The operation reserve of charge-discharge electric power dynamically distributes and photovoltaic generating system follows following rules and is judged：
1) as min [Pp,Pq,Pr]≥PPV/ 3 and SOC≤SOCminWhen setting up, control energy-storage system is stopped；
2) as min [Pp,Pq,Pr]≥PPV/ 3 set up, but SOC≤SOCminWhen invalid；Judge PPV+Pfmax≥Pα+PβIt is
No establishment；If so, energy-storage system is then made with Pα+Pβ-PPVPower discharge；If not, energy-storage system is then made with PfmaxWork(
Rate is discharged；
3) as min [Pp,Pq,Pr]≥PPV/ 3 is invalid, but SOC >=SOCmaxDuring establishment；Photovoltaic generating system is then made to export
Power is 3 × min [Pp,Pq,Pr], remaining PPV-3×min[Pp,Pq,Pr] photovoltaic electric energy abandons light and ration the power supply treatment；
4) as min [Pp,Pq,Pr]≥PPV/ 3 is invalid, and SOC >=SOCmaxAlso when invalid；Judge Pα+Pβ-PPV≥
PcmaxWhether set up；If so, energy-storage system is then made with PcmaxPower charge, remaining PPV-PcmaxPhotovoltaic electric energy abandons light limit
Electric treatment；If not, energy-storage system is then made with PcmaxPower charge, energy-storage system can dissolve whole photovoltaic electric energy.
Wherein, because the output current of three-phase photovoltaic inverter is symmetrical, therefore the photovoltaic power for respectively having 1/3rd is shared
In each phase of three-phase electrical power system.
On the other hand, present invention also offers a kind of electric railway three-phase photovoltaic energy storage system, including traction power supply system
System, photovoltaic generating system and energy-storage system；
The photovoltaic generating system includes Photovoltaic array and three-phase photovoltaic inverter, and the Photovoltaic array output end is connected to
The DC side of three-phase photovoltaic inverter；The energy-storage system includes energy storage device and three-phase energy accumulation current converter, energy storage device connection
To the DC side of three-phase energy accumulation current converter；
The two-phase side of two-phase-triphase step-down transformer, two-phase-three are connected on two supply arms of the tractive power supply system
3rd port of phase step-down transformer two-phase side is connected to rail, three-phase side and the three-phase photovoltaic of two-phase-triphase step-down transformer
The AC of inverter and the AC of three-phase energy accumulation current converter are connected jointly；Two supply arms of tractive power supply system pass through three
Phase-two-phase tractive transformer is connected to three-phase electrical power system.
It is further also to include central controller in system, the three-phase photovoltaic inverter, three-phase energy accumulation current converter, two-phase-
The control port of triphase step-down transformer and three-phase-two-phase tractive transformer is respectively connecting to central controller；By central controller, realize
The comprehensive automation control of system, realizes the automatic distribution of energy.
It is further to be provided with voltage detector and current detecting on two supply arms of the tractive power supply system
Device；Power-sensing circuit is provided with the three-phase photovoltaic inverter, SOC inspections are provided with the three-phase energy accumulation current converter
Slowdown monitoring circuit；The signal output part of the voltage detector, current detector, power-sensing circuit and SOC detection circuit is all connected with
To central controller；Realize the real-time detection of all parameters of system.
It is further that the energy storage device is the energy storage of contracting air, flywheel energy storage, batteries to store energy, superconducting energy storage or super
Level capacitance energy storage；Various energy storage devices can be applied to.
Using the beneficial effect of the technical program：
1) photovoltaic generating system is used cooperatively with energy-storage system, significantly improves the digestion capability to photovoltaic electric energy；
2) the rationally discharge and recharge of control energy-storage system, carries out abandoning light and rations the power supply under extreme case to photovoltaic generating system, it is to avoid
Tractive power supply system send power to power system is counter, fundamentally solves the Three-phase Power Flow being likely to occur during without energy-storage system not
Problem in the same direction；
3) on the basis of the technical program, by distributing the capacity of energy-storage system rationally, can further improve traction and supply
The economy of electric system.
Brief description of the drawings
Fig. 1 is a kind of control method schematic flow sheet of electric railway three-phase photovoltaic energy storage system of the invention；
Fig. 2 is that a kind of control method flow of electric railway three-phase photovoltaic energy storage system is shown in optimal enforcement of the present invention example
It is intended to；
Fig. 3 is a kind of structural representation of electric railway three-phase photovoltaic energy storage system of the invention；
Wherein, 11 is power system, and 12 is three-phase-two-phase tractive transformer, and 13 is tractive power supply system α supply arms, 14
It is tractive power supply system β supply arms, 15 is rail；21 is two-phase-triphase step-down transformer, and 22 is photovoltaic array, and 23 is three-phase
Photovoltaic DC-to-AC converter, 24 is energy storage device, and 25 is three-phase energy accumulation current converter.
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.
As shown in figure 1, the present invention proposes a kind of control method of electric railway three-phase photovoltaic energy storage system, by reality
When detection tractive power supply system, the running status of photovoltaic generating system and energy-storage system, so as to control the discharge and recharge of energy-storage system
The running status of power and photovoltaic generating system, including step：
S100, the amplitude and phase of two voltage and currents of supply arm of real-time detection tractive power supply system, obtains two
The voltage phasor U of supply armαAnd Uβ, and obtain two electric current phasor I of supply armαAnd Iβ；Real-time detection tractive power supply system
The amplitude and phase of high-pressure side three-phase voltage, obtain on high-tension side three-phase voltage phasor Up、UqAnd Ur；Real-time detection photovoltaic generation
The power output P of systemPV；And the state-of-charge SOC of real-time detection energy-storage system；
S200, using two voltage phasor U of supply armαAnd UβWith electric current phasor IαAnd Iβ, calculate the real-time of traction load
Electric power, i.e. active-power PαAnd PβAnd reactive power QαAnd Qβ；
S300, using two voltage phasor U of supply armαAnd UβWith electric current phasor IαAnd Iβ, on high-tension side three-phase voltage phase
Amount Up、UqAnd Ur, and traction load real-time electric power；Traction load is calculated in high-pressure side for three-phase electrical power system 11
Real-time electric power, i.e. active-power Pp、PqAnd PrAnd reactive power Qp、QqAnd Qr；
S400, real-time electric power, the power output of photovoltaic generating system and energy storage system according to three-phase electrical power system 11
The state-of-charge of system is judged, so as to control the charge-discharge electric power dynamically distributes of energy-storage system and the fortune of photovoltaic generating system
Row state.
Optimal enforcement example in, it is shown in Figure 2, two supply arms of note be α 13, β 14, the three-phase of power system 11 be A, B, C,
The control method is further illustrated by taking the power taking of α opposite A phases, the opposite A phases power takings of β as an example.
Two voltages of supply arm of real-time detection tractive power supply system, the amplitude of electric current, phase, and tractive power supply system
The amplitude of high-pressure side three-phase voltage, phase.Phasor Uα、UβRepresent two voltages of supply arm, phasor Iα、IβRepresent two power supplies
The electric current of arm, phasor UA、UB、UCRepresent on high-tension side three-phase voltage.
Calculate the real-time electric power of traction load：
Wherein P, Q represent active power and reactive power, I respectivelyα*、Iβ* the conjugate complex number of supply arm electric current phasor is represented.
Calculate real-time electric power of the traction load in high-pressure side for three-phase electrical power system 11：
Wherein K represents the no-load voltage ratio of tractive transformer.
The power output of real-time detection photovoltaic generating system, is designated as P simultaneouslyPV.Due to the output of three-phase photovoltaic inverter 23
Current-symmetrical, therefore the photovoltaic power for respectively having 1/3rd is split in each phase of three-phase electrical power system 11.In order to realize photovoltaic
" peak load shifting " of electric energy, and avoid to the anti-power transmission energy of power system 11, to the charge-discharge electric power dynamically distributes of energy-storage system
And the operation reserve of photovoltaic generating system follows following rules, wherein min [PA,PB,PC] represent that three-phase electrical power system 11 is active
The minimum value of power, SOC is the state-of-charge of energy-storage system, SOCmin、SOCmaxFor the minimum of energy-storage system permission, highest are charged
State, PfmaxIt is the maximum discharge power of energy-storage system, PcmaxIt is the maximum charge power of energy-storage system.
1) as min [PA,PB,PC]≥PPV/ 3 and SOC≤SOCminWhen setting up, energy-storage system does not work；
2) as min [PA,PB,PC]≥PPV/ 3 set up, but SOC≤SOCminWhen invalid, P is judgedPV+Pfmax≥Pα+PβIt is
No establishment, if so, then energy-storage system is with Pα+Pβ-PPVPower discharge, if it is not, then energy-storage system is with PfmaxPower discharge；
3) as min [PA,PB,PC]≥PPV/ 3 is invalid, but SOC >=SOCmaxDuring establishment, photovoltaic electric energy cannot fully be disappeared
Receive, it is 3 × min [P to make photovoltaic power generation system output powerA,PB,PC], remaining PPV-3×min[PA,PB,PC] photovoltaic electric energy abandons
Light is rationed the power supply treatment；
4) as min [PA,PB,PC]≥PPV/ 3 is invalid, and SOC >=SOCmaxAlso when invalid, P is judgedα+Pβ-PPV≥
PcmaxWhether set up, whole photovoltaic electric energy if so, energy-storage system cannot dissolve, then energy-storage system is with PcmaxPower charge, remaining
PPV-PcmaxPhotovoltaic electric energy is abandoned light and is rationed the power supply treatment, whole photovoltaic electric energy if it is not, energy-storage system can dissolve, then energy-storage system with
PcmaxPower charge.
The realization of inventive method, based on identical inventive concept, as shown in figure 3, present invention also offers a kind of electrified
Railway three-phase photovoltaic energy storage system, including tractive power supply system, photovoltaic generating system and energy-storage system；
The photovoltaic generating system includes photovoltaic array 22 and three-phase photovoltaic inverter 23, the output end of the photovoltaic array 22
It is connected to the DC side of three-phase photovoltaic inverter 23；The energy-storage system includes energy storage device 24 and three-phase energy accumulation current converter 25,
Energy storage device 24 is connected to the DC side of three-phase energy accumulation current converter 25；
The two-phase side of connection two-phase-triphase step-down transformer 21 on two supply arms of the tractive power supply system, two-phase-
3rd port of the two-phase side of triphase step-down transformer 21 is connected to rail 15, the three-phase side of two-phase-triphase step-down transformer 21 with
The AC of three-phase photovoltaic inverter 23 and the AC of three-phase energy accumulation current converter 25 are connected jointly；Two of tractive power supply system
Supply arm is connected to three-phase electrical power system 11 by three-phase-two-phase tractive transformer 12.
The three-phase voltage of three-phase electrical power system 11 is transformed to two-phase voltage to electrification by three-phase-two-phase tractive transformer 12
Railway power supply, three ports of secondary side of three-phase-two-phase tractive transformer 12 connect respectively tractive power supply system α supply arms 13,
Tractive power supply system β supply arms 14 and rail 15.
In electric railway three-phase photovoltaic energy storage system, two-phase-triphase step-down transformer 21 is by tractive power supply system
Two-phase voltage is transformed to symmetrical three-phase voltage, is provided suitably with to three-phase photovoltaic inverter 23, three-phase energy accumulation current converter 25
Voltage, makes its normal work.
Photovoltaic module constitutes photovoltaic array 22 by connection in series-parallel；Three-phase photovoltaic inverter 23 realize photovoltaic electric energy boosting,
Maximal power tracing and inversion.
Energy storage device 24 is that by the storage of electric energy and a kind equipment of release function, its typical form include but
It is not limited only to compressed-air energy storage, flywheel energy storage, batteries to store energy, superconducting energy storage, super capacitor energy-storage etc..
Three-phase energy accumulation current converter 25 can be according to the charge or discharge of instruction control energy storage device 24.Three-phase photovoltaic inverter
23 and three-phase energy accumulation current converter 25 AC to be connected in parallel, so as to realize " peak clipping of the energy-storage system to photovoltaic generating system
Fill valley ".
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 (8)
1. a kind of control method of electric railway three-phase photovoltaic energy storage system, it is characterised in that drawn by real-time detection and supplied
The running status of electric system, photovoltaic generating system and energy-storage system, so as to control the charge-discharge electric power and photovoltaic of energy-storage system
The running status of electricity generation system, including step：
S100, the amplitude and phase of two voltage and currents of supply arm of real-time detection tractive power supply system obtain two power supplies
The voltage phasor U of armαAnd Uβ, and obtain two electric current phasor I of supply armαAnd Iβ；Real-time detection tractive power supply system high pressure
The amplitude and phase of side three-phase voltage, obtain on high-tension side three-phase voltage phasor Up、UqAnd Ur；Real-time detection photovoltaic generating system
Power output PPV；And the state-of-charge SOC of real-time detection energy-storage system；
S200, using two voltage phasor U of supply armαAnd UβWith electric current phasor IαAnd Iβ, calculate the real-time electricity consumption of traction load
Power, i.e. active-power PαAnd PβAnd reactive power QαAnd Qβ；
S300, using two voltage phasor U of supply armαAnd UβWith electric current phasor IαAnd Iβ, on high-tension side three-phase voltage phasor Up、
UqAnd Ur, and traction load real-time electric power；Calculate traction load real-time for three-phase electrical power system (11) in high-pressure side
Electric power, i.e. active-power Pp、PqAnd PrAnd reactive power Qp、QqAnd Qr；
S400, real-time electric power, the power output of photovoltaic generating system and energy-storage system according to three-phase electrical power system (11)
State-of-charge judged, so as to control charge-discharge electric power dynamically distributes and the operation of photovoltaic generating system of energy-storage system
State.
2. the control method of a kind of electric railway three-phase photovoltaic energy storage system according to claim 1, it is characterised in that
In step S200, the real-time electric power of traction load is calculated, specific formula is：
Wherein, Iα *、Iβ *Two conjugate complex numbers of supply arm electric current phasor of tractive power supply system are represented respectively.
3. the control method of a kind of electric railway three-phase photovoltaic energy storage system according to claim 2, it is characterised in that
In step S300, traction load is calculated in real-time electric power of the high-pressure side for three-phase electrical power system (11), specific formula is：
Wherein, Pp、Pq、PrRepresent traction load on high-tension side three phases active power, Q respectivelyp、Qq、QrRepresent that traction is negative respectively
In on high-tension side three phase reactive power, K represents the no-load voltage ratio of tractive transformer, I to lotusα *、Iβ *Tractive power supply system two is represented respectively
The conjugate complex number of supply arm electric current phasor.
4. a kind of control method of the electric railway three-phase photovoltaic energy storage system according to claim 1 or 3, its feature exists
In, the step S400, including step：
The minimum state-of-charge SOC that setting energy-storage system is allowedminWith highest state-of-charge SOCmax, set the maximum of energy-storage system
Discharge power PfmaxWith maximum charge power Pcmax；
Take the active power minimum value min [P in the real-time electric power of three-phase electrical power system (11)p,Pq,Pr]；
Judged：
1) as min [Pp,Pq,Pr]≥PPV/ 3 and SOC≤SOCminWhen setting up, control energy-storage system is stopped；
2) as min [Pp,Pq,Pr]≥PPV/ 3 set up, but SOC≤SOCminWhen invalid；Judge PPV+Pfmax≥Pα+PβWhether into
It is vertical；If so, energy-storage system is then made with Pα+Pβ-PPVPower discharge；If not, energy-storage system is then made with PfmaxPower put
Electricity；
3) as min [Pp,Pq,Pr]≥PPV/ 3 is invalid, but SOC >=SOCmaxDuring establishment；Then make photovoltaic power generation system output power
It is 3 × min [Pp,Pq,Pr], remaining PPV-3×min[Pp,Pq,Pr] photovoltaic electric energy abandons light and ration the power supply treatment；
4) as min [Pp,Pq,Pr]≥PPV/ 3 is invalid, and SOC >=SOCmaxAlso when invalid；Judge Pα+Pβ-PPV≥PcmaxWhether
Set up；If so, energy-storage system is then made with PcmaxPower charge, remaining PPV-PcmaxPhotovoltaic electric energy is abandoned light and is rationed the power supply treatment；
If not, energy-storage system is then made with PcmaxPower charge.
5. a kind of electric railway three-phase photovoltaic energy storage system, it is characterised in that including tractive power supply system, photovoltaic generating system
And energy-storage system；
The photovoltaic generating system includes photovoltaic array (22) and three-phase photovoltaic inverter (23), photovoltaic array (22) output
End is connected to the DC side of three-phase photovoltaic inverter (23)；The energy-storage system includes energy storage device (24) and three-phase energy storage unsteady flow
Device (25), energy storage device (24) is connected to the DC side of three-phase energy accumulation current converter (25)；
The two-phase side of two-phase-triphase step-down transformer (21), two-phase-three are connected on two supply arms of the tractive power supply system
3rd port of phase step-down transformer (21) two-phase side is connected to rail (15), the three-phase of two-phase-triphase step-down transformer (21)
Side is connected jointly with the AC of three-phase photovoltaic inverter (23) and the AC of three-phase energy accumulation current converter (25)；Traction power supply system
Two supply arms of system are connected to three-phase electrical power system (11) by three-phase-two-phase tractive transformer (12).
6. a kind of electric railway three-phase photovoltaic energy storage system according to claim 5, it is characterised in that also wrapped in system
Include central controller, the three-phase photovoltaic inverter (23), three-phase energy accumulation current converter (25), two-phase-triphase step-down transformer (21) and
The control port of three-phase-two-phase tractive transformer (12) is respectively connecting to central controller.
7. a kind of electric railway three-phase photovoltaic energy storage system according to claim 6, it is characterised in that in the traction
Voltage detector and current detector are provided with two supply arms of electric power system；Set in the three-phase photovoltaic inverter (23)
Power-sensing circuit is equipped with, SOC detection circuits are provided with the three-phase energy accumulation current converter (25)；The voltage detector,
The signal output part of current detector, power-sensing circuit and SOC detection circuit is connected to central controller.
8. a kind of electric railway three-phase photovoltaic energy storage system according to claim 5, it is characterised in that the energy storage dress
It is the energy storage of contracting air, flywheel energy storage, batteries to store energy, superconducting energy storage or super capacitor energy-storage to put (24).
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