CN107093911A - A kind of intelligent photovoltaic energy-storage system - Google Patents
A kind of intelligent photovoltaic energy-storage system Download PDFInfo
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- CN107093911A CN107093911A CN201710325376.3A CN201710325376A CN107093911A CN 107093911 A CN107093911 A CN 107093911A CN 201710325376 A CN201710325376 A CN 201710325376A CN 107093911 A CN107093911 A CN 107093911A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 162
- 238000010248 power generation Methods 0.000 claims abstract description 35
- 238000012544 monitoring process Methods 0.000 claims abstract description 20
- 239000003990 capacitor Substances 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 16
- 238000003860 storage Methods 0.000 claims description 11
- 230000004044 response Effects 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims description 7
- 238000002955 isolation Methods 0.000 claims description 6
- 238000010183 spectrum analysis Methods 0.000 claims description 4
- 238000011426 transformation method Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 230000033228 biological regulation Effects 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 description 8
- 238000005457 optimization Methods 0.000 description 5
- 238000005553 drilling Methods 0.000 description 4
- 206010011906 Death Diseases 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000004422 calculation algorithm Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
-
- H02J3/383—
-
- 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
-
- 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
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
-
- 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
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/50—Energy storage in industry with an added climate change mitigation effect
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a kind of intelligent photovoltaic energy-storage system, the intelligent photovoltaic energy-storage system can be by monitoring in the lump to photovoltaic power generation apparatus, energy storage device and grid-connection device, the power swing value of photovoltaic power generation apparatus is known in time, and as the power of information source dynamic regulation energy storage device, so as to smooth grid entry point power, the economical operation in photovoltaic energy storage power station is realized.
Description
Art
The present invention relates to technical field of photovoltaic power generation, and in particular to a kind of intelligent photovoltaic energy-storage system.
Background technology
With the growth and the propulsion of developing country's process of industrialization of earth population, various fossil energies are exhausted rapidly,
And the atmosphere pollution caused during fossil energy use and Ecological Environment Crisis are also increasingly serious.
In recent years, with the drastically consumption and the aggravation of environmental pollution of traditional energy, New Energy Industry is obtained greatly
Pay close attention to and support energetically.Photovoltaic generation is as one of most cheap energy, and photovoltaic generation is widely used.However, from
Right light is influenceed have very strong uncontrollability, fluctuation and intermittence by a variety of natural causes such as height above sea level, weather, temperature, landform,
And it is difficult to Accurate Prediction and a large amount of storages.
With photovoltaic energy storage power station large-scale grid connection, impact of its power swing to power network is increasingly protruded.In grid-connected light
Appropriate energy-storage system is configured in volt system, the power output to wind power plant is adjusted, can improve that photovoltaic generation exerts oneself can
Control property so that photovoltaic energy storage power station turns into flexible controllable power supply.When photovoltaic generation exert oneself it is larger, but network load it is relatively low when,
Long-time, the energy stores of Large Copacity are carried out to the power output in photovoltaic energy storage power station by energy-storage system；Treat that network load reaches
Peak value and to photovoltaic energy storage power station exert oneself increase in demand when, energy-storage system exports the energy stored to power network, for user
Use.
Because energy-storage system cost is higher, the maximum economic use value for playing energy-storage system how is selected, is improved simultaneously
Energy-storage system service life, the problem of being badly in need of considering as photovoltaic generation operation enterprise.Energy-storage travelling wave tube does not have actively in itself
The ability that exchanges of accurate power is carried out with photovoltaic energy storage power station, it is necessary to add charging-discharging controller, the discharge and recharge to energy-storage travelling wave tube
Power is accurately controlled.Current single energy storage device can not fully meet the requirement of engineering.Energy storage setting power is divided into
Frequent fluctuation part and smooth, are undertaken by super capacitor and energy-storage battery respectively, it is possible to achieve to stabilizing the quick of demand
Response.
The content of the invention
The present invention provides a kind of intelligent photovoltaic energy-storage system, and the intelligent photovoltaic energy-storage system can be by filling to photovoltaic generation
Put, energy storage device and grid-connection device are monitored in the lump, the power swing value of photovoltaic power generation apparatus is known in time, and as information source
The power of dynamic regulation energy storage device, so that smooth grid entry point power, realizes the economical operation in photovoltaic energy storage power station.
To achieve these goals, the present invention provides a kind of intelligent photovoltaic energy-storage system, and the intelligent photovoltaic energy-storage system is set
Put in photovoltaic energy storage power station, the intelligent photovoltaic energy-storage system includes：
Energy storage device, for storage energy, and can be when photovoltaic energy storage electric station grid connection is run, power output；
Dc bus, for realizing the Power Exchange between photovoltaic power generation apparatus, energy storage device, power network；
Photovoltaic power generation apparatus monitoring module, for monitoring photovoltaic power generation apparatus in real time, and to the generating of photovoltaic power generation apparatus
Power is predicted；
Parallel control module, for monitoring photovoltaic energy storage electric station grid connection point ac bus voltage, and for controlling photovoltaic to store up
It is incorporated into the power networks via grid-connecting apparatus in energy power station；
Energy storage device monitoring module, for monitoring the power attenuation situation of energy storage device in real time, and controls energy storage device
Operation；
Middle control module, the operation method for determining photovoltaic energy storage power station, and instruction is sent to above-mentioned each module, to perform
The operation method；
Communication bus, the liaison for above-mentioned modules.
It is preferred that, the energy storage device includes ultracapacitor group and batteries, the batteries and super capacitor
Group is parallel to described straight by the two-way DC/DC converters of the first non-isolation type, the two-way DC/DC converters of the second non-isolation type respectively
Flow on bus.
It is preferred that, the photovoltaic power generation apparatus monitoring module includes：
Mode controlling unit, if for there is energy storage device failure, controlling the unidirectional DC/DC converters of photovoltaic power generation apparatus
It is operated in the DC bus-bar voltage constant pressure source module；
First judging unit, for judging whether photovoltaic battery panel PV meets default tracking adjustment condition；
Electric current limits unit, if for judging that PV meets the default tracking adjustment condition, the unidirectional DC/DC is become
The electric current loop maximum current set-point of parallel operation is defined to default adjusted value；
Second judging unit, for judging whether DC bus-bar voltage meets rated condition；
Electric current rise unit, if for judging that the DC bus-bar voltage meets the rated condition, controlling the list
Gone up to the electric current loop maximum current set-point of DC/DC converters with scheduled rate by the default adjusted value to initial value.
It is preferred that, first judging unit includes：
First judge module, for judging whether PV power outputs reduce with PV voltages and reduce；
Second judge module, if being reduced for judging PV power outputs to reduce with PV voltages, judges PV electric currents with PV
Whether the change of voltage is less than preset difference value；If it is described that second judge module judges that PV electric currents are less than with the change of PV voltages
Preset difference value, then judge that PV meets the default tracking adjustment condition.
It is preferred that, the default adjusted value is：Irefmax=K × Isc；
Wherein, K is that electric current limits coefficient, IscFor short circuit current flow.
It is preferred that, the short circuit current flow is current PV electric currents.
It is preferred that, when second judging unit is used to judge whether the DC bus-bar voltage meets rated condition, tool
Body is used to judge whether the DC bus-bar voltage goes back up to rated value, and goes back up to the continuous duration of the rated value more than pre-
If duration.
It is preferred that, the energy storage device is configured in the following way：
Calculate when photovoltaic power generation apparatus is fluctuated, it is necessary to the balance power that energy storage device is stabilized；
Using Fourier transformation method, spectrum analysis is carried out to balance power data；
Balance power bands are divided according to actual energy storage device response speed, the type and pin of each frequency range energy storage device is determined
Carry out the proportioning of capacity of energy storing device respectively to different frequency range；
With reference to energy storage device charge and discharge electrical loss and cycle life, it is determined that making the minimum energy storage frequency range segmentation of energy storage device cost
Point and corresponding optimal energy storage configuration.
The photovoltaic energy storage power station of the present invention has the following advantages that：(1) can be by photovoltaic power generation apparatus, energy storage device and simultaneously
Net equipment is monitored in the lump, the power swing information in monitoring photovoltaic energy storage power station, and being filled as the energy storage of information dynamic regulation in time
The power put, so as to realize grid entry point power smooth；(2) energy storage device is used in mixed way storage using battery and ultracapacitor
The mode of electric energy, which causes battery energy storage and the respective advantage of ultracapacitor energy storage to be able to complementary wherein battery and be used to
Demand ultracapacitor that Large Copacity electric energy handles up is met to meet the demand that peak power is handled up；(3) present invention is using flat
The method for pressing down photovoltaic power generation apparatus power swing sets energy storage device and its capacity, has considered battery charging and discharging loss and has followed
The engineering practical factor such as ring life-span, as a result closer to actual requirement.
Brief description of the drawings
Fig. 1 shows a kind of block diagram in the photovoltaic energy storage power station of intelligent photovoltaic energy-storage system with the present invention；
Fig. 2 shows a kind of operation method flow in the photovoltaic energy storage power station of the intelligent photovoltaic energy-storage system with the present invention
Figure.
Embodiment
Fig. 1 is to show a kind of intelligent photovoltaic energy-storage system 11, and the intelligent photovoltaic energy-storage system 11 is arranged on photovoltaic energy storage
In power station 10, the intelligent photovoltaic energy-storage system 11 includes：
Energy storage device 115, for storage energy, and can be when photovoltaic energy storage electric station grid connection is run, power output；
Dc bus 114, for realizing the Power Exchange between photovoltaic power generation apparatus 12, energy storage device 115, power network 20；
Photovoltaic power generation apparatus monitoring module 113, for monitoring photovoltaic power generation apparatus 12 in real time, and to photovoltaic power generation apparatus 12
Generated output be predicted；
Parallel control module 112, for monitoring the grid entry point ac bus voltage of photovoltaic energy storage power station 10, and for controlling light
Volt energy-accumulating power station 10 is incorporated into the power networks via grid-connecting apparatus 13；
Energy storage device monitoring module 117, for monitoring the power attenuation situation of energy storage device 115 in real time, and controls energy storage
The operation of device 115；
Middle control module 116, the operation method for determining photovoltaic energy storage power station 10, and instruction is sent to above-mentioned each module,
To perform the operation method；
Communication bus 111, the liaison for above-mentioned modules.
It is preferred that, the energy storage device 115 includes ultracapacitor group and batteries, the batteries and super electricity
Appearance group is parallel to described by the two-way DC/DC converters of the first non-isolation type, the two-way DC/DC converters of the second non-isolation type respectively
On dc bus 114.
It is preferred that, the energy storage device monitoring module 117 controls energy storage device 115 in the following way：
(1) preferentially give super capacitor charge and discharge, using super capacitor can charge and discharge infinitely, reduction battery fill, put
Electric number of times, increasing storage battery service life；
(2) battery enters after charge and discharge state, and super capacitor progressively exits charge and discharge, to avoid super capacitor from being full of
Electricity is discharged, and is saved capacity and is waited DC bus-bar voltage fluctuation next time；
(3) super capacitor charge and discharge control is using DC bus-bar voltage outer shroud and the two close cycles of super-capacitor voltage inner ring
Control, maintains DC bus-bar voltage stable, it is ensured that charge and discharge electric current is no more than the maximum current that super capacitor can be born；
(4) battery charge and discharge control is using in DC bus-bar voltage outer shroud and battery tension inner ring, battery current
The Three-loop control of ring, maintains DC bus-bar voltage stable, and control battery, which is crossed, to be put and gassing.
It is preferred that, the pulse charge method includes the description below：
When battery charging voltage is less than default gassing magnitude of voltage, DC bus-bar voltage outer shroud plays a major role, battery
Voltage inter-loop does not work, and now battery has the ability to absorb all dump energies in photovoltaic power generation apparatus；
When battery charging voltage is equal to default gassing magnitude of voltage, voltage inter-loop is functioned to, now to battery
The negative pulse discharge of △ t (0.5-1s) times is carried out, makes storage battery drops, continues, with former electric current charging of discharging, to arrive
Battery tension reaches default gassing magnitude of voltage again, then carries out the negative pulse discharge of △ t times, is circulated with this, until charging
Time interval is identical with discharge time interval；
Battery is full of, and pulse charge can fill, into the low current floating charge stage of Isobarically Control, battery tension
Inner ring plays a major role；
Battery current ring limits charging and discharging currents, when charging and discharging currents reach that limit value is still unable to stable DC bus electricity
Pressure, super capacitor starts discharge and recharge.
It is preferred that, the photovoltaic power generation apparatus monitoring module 113 includes：
Mode controlling unit, if for there is the failure of energy storage device 115, the unidirectional DC/DC of control photovoltaic power generation apparatus 12
Converter is operated in the DC bus-bar voltage constant pressure source module；
First judging unit, for judging whether photovoltaic battery panel PV meets default tracking adjustment condition；
Electric current limits unit, if for judging that PV meets the default tracking adjustment condition, the unidirectional DC/DC is become
The electric current loop maximum current set-point of parallel operation is defined to default adjusted value；
Second judging unit, for judging whether DC bus-bar voltage meets rated condition；
Electric current rise unit, if for judging that the DC bus-bar voltage meets the rated condition, controlling the list
Gone up to the electric current loop maximum current set-point of DC/DC converters with scheduled rate by the default adjusted value to initial value.
It is preferred that, first judging unit includes：
First judge module, for judging whether PV power outputs reduce with PV voltages and reduce；
Second judge module, if being reduced for judging PV power outputs to reduce with PV voltages, judges PV electric currents with PV
Whether the change of voltage is less than preset difference value；If it is described that second judge module judges that PV electric currents are less than with the change of PV voltages
Preset difference value, then judge that PV meets the default tracking adjustment condition.
It is preferred that, the default adjusted value is：Irefmax=K × Isc；
Wherein, K is that electric current limits coefficient, IscFor short circuit current flow.
It is preferred that, the short circuit current flow is current PV electric currents.
It is preferred that, when second judging unit is used to judge whether the DC bus-bar voltage meets rated condition, tool
Body is used to judge whether the DC bus-bar voltage goes back up to rated value, and goes back up to the continuous duration of the rated value more than pre-
If duration.
It is preferred that, the energy storage device 115 is configured in the following way：
Calculate when photovoltaic power generation apparatus 12 is fluctuated, it is necessary to the balance power that energy storage device is stabilized；
Using Fourier transformation method, spectrum analysis is carried out to balance power data；
Balance power bands are divided according to the actual response speed of energy storage device 115, the type of each frequency range energy storage device is determined
And carry out the proportioning of capacity of energy storing device respectively for different frequency range；
With reference to the charge and discharge electrical loss of energy storage device 115 and cycle life, it is determined that making the minimum energy storage frequency range of energy storage device cost
Cut-point and corresponding optimal energy storage configuration.
It is preferred that, the capacity of the energy storage device 115 includes power capacity and energy capacity；Power capacity and energy capacity
Calculation it is as follows：
By the signal zero outside the response frequency scope of energy storage device 115, retain the signal in response frequency to realize signal
Frequency dividing；
Filtered each frequency-region signal is restored to time domain using inverse fast Fourier transform algorithm (IFFT)；
The minimum power capacity P of energy storage device 115 is determined using below equationES：
PES=max (Ppeak.positive,|Ppeak.negative|)
That is minimum power capacity PESDepending on the positive negative peak P in correspondence time-domain signal after filteringpeak.positive、
Ppeak.negativeMaximum absolute value value；Ensure that energy storage device 115 can effectively stabilize whole fluctuations in corresponding frequency band；
The least energy capacity E of energy storage device 115 is determined using below equationES.：
EES.calculated=max (Epeak.positive,|Epeak.negative|),
EES=2EES.calculatedWherein：
Epeak.positive=max (∫ Pb)/3600
Epeak.negative=min (∫ Pb)/3600, PbFor balance power.
It is preferred that, the optimization of energy storage configuration 115 of least cost specifically includes following steps：
According to the power totle drilling cost relation equal with energy totle drilling cost, to energy storage rated power capacity and energy storage rated energy
Capacity is revised；
Bringing revised energy storage rated energy capacity into following equation calculating energy storage device can dissolve before end-of-life
Or the whole energy sent：
EES_total=EES_rated/ 2 × [1+ (1-m)+(1-m)2+ ...+(1-m)N-1]；M is correspondence energy storage device single
Charge and discharge electrical loss capacity, N is the energy storage global cycle life-span.
The energy storage device calculated by following equation in meter hybrid energy-storing combination under each dividing frequency changes number of times：
T=Estation_total/EES_total
Number of times is changed according to energy storage device and sets up cost and dividing frequency functional relation, the optimal storage under least cost is tried to achieve
Can configuration.
Accompanying drawing 2 shows the operation method in the photovoltaic energy storage power station of the intelligent photovoltaic energy-storage system with the present invention, the party
Method comprises the following steps：
S1. the service data of photovoltaic power generation apparatus is obtained in real time, and photovoltaic energy storage electric station grid connection point service data is obtained in real time；
S2. according to photovoltaic power generation apparatus service data and grid entry point service data, optimization energy storage device configuration；
S3. under energy storage configuration after optimization, control photovoltaic power generation apparatus and energy storage device are coordinated so that photovoltaic energy storage electricity
Realize economical operation in station.
It is preferred that, in step s 2, specifically adopt optimization energy storage configuration with the following method：
S21. calculate when photovoltaic power generation apparatus 12 is fluctuated, it is necessary to the balance power that energy storage device is stabilized；
S22. Fourier transformation method is used, spectrum analysis is carried out to balance power data；
S23. balance power bands are divided according to the actual response speed of energy storage device 115, determines each frequency range energy storage device
Type and the proportioning for carrying out capacity of energy storing device respectively for different frequency range；
S24. the charge and discharge electrical loss of energy storage device 115 and cycle life are combined, it is determined that making the minimum energy storage of energy storage device cost
Frequency range cut-point and corresponding optimal energy storage configuration.
It is preferred that, the capacity of the energy storage device 115 includes power capacity and energy capacity；Power capacity and energy capacity
Calculation it is as follows：
By the signal zero outside the response frequency scope of energy storage device 115, retain the signal in response frequency to realize signal
Frequency dividing；
Filtered each frequency-region signal is restored to time domain using inverse fast Fourier transform algorithm (IFFT)；
The minimum power capacity P of energy storage device 115 is determined using below equationES：
PES=max (Ppeak.positive,|Ppeak.negative|)
That is minimum power capacity PESDepending on the positive negative peak P in correspondence time-domain signal after filteringpeak.positive、
Ppeak.negativeMaximum absolute value value；Ensure that energy storage device 115 can effectively stabilize whole fluctuations in corresponding frequency band；
The least energy capacity E of energy storage device 115 is determined using below equationES.：
EES.calculated=max (Epeak.positive,|Epeak.negative|),
EES=2EES.calculatedWherein：
Epeak.positive=max (∫ Pb)/3600
Epeak.negative=min (∫ Pb)/3600, PbFor balance power.
It is preferred that, the optimization of energy storage configuration 115 of least cost specifically includes following steps：
According to the power totle drilling cost relation equal with energy totle drilling cost, to energy storage rated power capacity and energy storage rated energy
Capacity is revised；
Bringing revised energy storage rated energy capacity into following equation calculating energy storage device can dissolve before end-of-life
Or the whole energy sent：
EES_total=EES_rated/ 2 × [1+ (1-m)+(1-m)2+ ...+(1-m)N-1]；M is correspondence energy storage device single
Charge and discharge electrical loss capacity, N is the energy storage global cycle life-span.
The energy storage device calculated by following equation in meter hybrid energy-storing combination under each dividing frequency changes number of times：
T=Estation_total/EES_total
Number of times is changed according to energy storage device and sets up cost and dividing frequency functional relation, the optimal storage under least cost is tried to achieve
Can configuration.
It is preferred that, in the step S3, adopt and energy storage device is controlled with the following method：
S31. preferentially give super capacitor charge and discharge, using super capacitor can charge and discharge infinitely, reduction battery fill, put
Electric number of times, increasing storage battery service life；
S32. battery enters after charge and discharge state, and super capacitor progressively exits charge and discharge, to avoid super capacitor from filling
Full electricity is discharged, and is saved capacity and is waited DC bus-bar voltage fluctuation next time；
S33. super capacitor charge and discharge control is using DC bus-bar voltage outer shroud and the two close cycles of super-capacitor voltage inner ring
Control, maintains DC bus-bar voltage stable, it is ensured that charge and discharge electric current is no more than the maximum current that super capacitor can be born；
S34. battery charge and discharge control uses DC bus-bar voltage outer shroud and battery tension inner ring, battery current
The Three-loop control of inner ring, maintains DC bus-bar voltage stable, and control battery, which is crossed, to be put and gassing.
It is preferred that, the pulse charge method includes the description below：
When battery charging voltage is less than default gassing magnitude of voltage, DC bus-bar voltage outer shroud plays a major role, battery
Voltage inter-loop does not work, and now battery has the ability to absorb all dump energies in photovoltaic power generation apparatus；
When battery charging voltage is equal to default gassing magnitude of voltage, voltage inter-loop is functioned to, now to battery
The negative pulse discharge of △ t (0.5-1s) times is carried out, makes storage battery drops, continues, with former electric current charging of discharging, to arrive
Battery tension reaches default gassing magnitude of voltage again, then carries out the negative pulse discharge of △ t times, is circulated with this, until charging
Time interval is identical with discharge time interval；
Battery is full of, and pulse charge can fill, into the low current floating charge stage of Isobarically Control, battery tension
Inner ring plays a major role；
Battery current ring limits charging and discharging currents, when charging and discharging currents reach that limit value is still unable to stable DC bus electricity
Pressure, super capacitor starts discharge and recharge.
It is preferred that, in the step S3, adopt and photovoltaic power generation apparatus is controlled with the following method：
If S301. there is the failure of energy storage device 115, the control unidirectional DC/DC converters of photovoltaic power generation apparatus 12 are operated in
The DC bus-bar voltage constant pressure source module；
S302. judge whether photovoltaic battery panel PV meets default tracking adjustment condition；
If S303. judging, PV meets the default tracking adjustment condition, by the electric current loop of the unidirectional DC/DC converters
Maximum current set-point is defined to default adjusted value；
S304. judge whether DC bus-bar voltage meets rated condition；
If S305. judging, the DC bus-bar voltage meets the rated condition, controls the unidirectional DC/DC converters
Electric current loop maximum current set-point gone up with scheduled rate by the default adjusted value to initial value.
The technological thought of above example only to illustrate the invention, it is impossible to which protection scope of the present invention is limited with this, it is every
According to technological thought proposed by the present invention, any change done on the basis of technical scheme each falls within the scope of the present invention
Within.Embodiments of the present invention are explained in detail above, but the present invention is not limited to above-mentioned embodiment, in ability
In the knowledge that domain those of ordinary skill possesses, various changes are made on the premise of can also or else departing from present inventive concept
Change.
Claims (8)
1. a kind of intelligent photovoltaic energy-storage system, the intelligent photovoltaic energy-storage system is arranged in photovoltaic energy storage power station, the intelligent light
Volt energy-storage system includes：
Energy storage device, for storage energy, and can be when photovoltaic energy storage electric station grid connection is run, power output；
Dc bus, for realizing the Power Exchange between photovoltaic power generation apparatus, energy storage device, power network；
Photovoltaic power generation apparatus monitoring module, for monitoring photovoltaic power generation apparatus in real time, and to the generated output of photovoltaic power generation apparatus
It is predicted；
Parallel control module, for monitoring photovoltaic energy storage electric station grid connection point ac bus voltage, and for controlling photovoltaic energy storage electricity
Stand and be incorporated into the power networks via grid-connecting apparatus；
Energy storage device monitoring module, for monitoring the power attenuation situation of energy storage device in real time, and controls the operation of energy storage device；
Middle control module, the operation method for determining photovoltaic energy storage power station, and instruction is sent to above-mentioned each module, to perform the fortune
Row method；
Communication bus, the liaison for above-mentioned modules.
2. intelligent photovoltaic energy-storage system as claimed in claim 1, it is characterised in that the energy storage device includes ultracapacitor
Group and batteries, the batteries and super capacitor group pass through the two-way DC/DC converters of the first non-isolation type, second respectively
The two-way DC/DC converters of non-isolation type are parallel on the dc bus.
3. intelligent photovoltaic energy-storage system as claimed in claim 1 or 2, it is characterised in that the photovoltaic power generation apparatus monitors mould
Block includes：
Mode controlling unit, if for there is energy storage device failure, the unidirectional DC/DC converters work of control photovoltaic power generation apparatus
In the DC bus-bar voltage constant pressure source module；
First judging unit, for judging whether photovoltaic battery panel PV meets default tracking adjustment condition；
Electric current limits unit, if for judging that PV meets the default tracking adjustment condition, by the unidirectional DC/DC converters
Electric current loop maximum current set-point be defined to default adjusted value；
Second judging unit, for judging whether DC bus-bar voltage meets rated condition；
Electric current rise unit, if for judging that the DC bus-bar voltage meets the rated condition, controlling the unidirectional DC/
The electric current loop maximum current set-point of DC converters is gone up to initial value with scheduled rate by the default adjusted value.
4. intelligent photovoltaic energy-storage system as claimed in claim 3, it is characterised in that first judging unit includes：
First judge module, for judging whether PV power outputs reduce with PV voltages and reduce；
Second judge module, if being reduced for judging PV power outputs to reduce with PV voltages, judges PV electric currents with PV voltages
Change whether be less than preset difference value；If it is described default that second judge module judges that PV electric currents are less than with the change of PV voltages
Difference, then judge that PV meets the default tracking adjustment condition.
5. intelligent photovoltaic energy-storage system as claimed in claim 4, it is characterised in that the default adjusted value is：Irefmax=K
×Isc；
Wherein, K is that electric current limits coefficient, IscFor short circuit current flow.
6. intelligent photovoltaic energy-storage system as claimed in claim 5, it is characterised in that the short circuit current flow is current PV electric currents.
7. intelligent photovoltaic energy-storage system as claimed in claim 6, it is characterised in that second judging unit is used to judge institute
When stating DC bus-bar voltage and whether meeting rated condition, specifically for judging it is specified whether the DC bus-bar voltage goes back up to
Value, and the continuous duration of the rated value is gone back up to more than preset duration.
8. the intelligent photovoltaic energy-storage system as described in claim 1-7 is any, it is characterised in that the energy storage device is using as follows
Mode is configured：
Calculate when photovoltaic power generation apparatus is fluctuated, it is necessary to the balance power that energy storage device is stabilized；
Using Fourier transformation method, spectrum analysis is carried out to balance power data；
Balance power bands are divided according to actual energy storage device response speed, the type of each frequency range energy storage device are determined and for not
Carry out the proportioning of capacity of energy storing device respectively with frequency range；
With reference to energy storage device charge and discharge electrical loss and cycle life, it is determined that make the minimum energy storage frequency range cut-point of energy storage device cost and
Corresponding optimal energy storage configuration.
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| CN110034570A (en) * | 2019-05-16 | 2019-07-19 | 阳光电源股份有限公司 | Control method, device and the photovoltaic plant of energy storage device |
| CN114123327A (en) * | 2021-11-26 | 2022-03-01 | 西安领充创享新能源科技有限公司 | Control method of grid-connected equipment, control equipment and storage medium |
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