CN109103932A - A kind of solar energy off-network energy-accumulating power station and state's network source mixed power supply system - Google Patents
A kind of solar energy off-network energy-accumulating power station and state's network source mixed power supply system Download PDFInfo
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- CN109103932A CN109103932A CN201811125615.1A CN201811125615A CN109103932A CN 109103932 A CN109103932 A CN 109103932A CN 201811125615 A CN201811125615 A CN 201811125615A CN 109103932 A CN109103932 A CN 109103932A
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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
- 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
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/10—Photovoltaic [PV]
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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
Abstract
The present invention relates to a kind of solar energy off-network energy-accumulating power stations and state's network source mixed power supply system, a kind of this solar energy off-network energy-accumulating power station and state's network source mixed power supply system can switch between solar energy off-network energy-accumulating power station and state's network source according to system operation situation, solar energy off-network energy-accumulating power station and the completely isolated mutual independence of state's network source, off-network energy-accumulating power station can voluntarily be purchased according to relevant national standard designed, designed and voluntarily be produced, it is limited without being netted examination rules and regulations by state, cost can be reduced, Fast Construction benefits the people.After having built energy storage off-grid system, building can also install solar energy additional and directly the direct current of hair and on battery system for the fact that without land certificate and property ownership certificate.In addition off-network energy-accumulating power station can be used as independent current source all the way, improves the power supply reliability of some particular job occasions.
Description
Technical field
The present invention relates to a kind of solar energy off-network energy-accumulating power stations and state's network source mixed power supply system.
Background technique
Since the charge calculation policy of low-pressure grid-connection energy-accumulating power station and distributed low-pressure grid-connection photovoltaic plant conflicts mutually, on
Low-pressure grid-connection energy-accumulating power station sells electric qualification it is necessary to abandon distributed low-pressure grid-connection photovoltaic plant, the online of photovoltaic low pressure
Dianbai is given for free to power supply company, and grid-connected energy-accumulating power station will also be checked and accepted by national grid tissue, not only expended the time but also expend at
This, the power station for construction of otherwise working hard just can not be grid-connected in time.
Meanwhile having part use compared with special occasions, do not allow power supply to there is shaking, outage condition to occur, even if using two-way
State's network source also can not be solved thoroughly；Sometimes when natural calamity occurs, multiple power supplies all can be impacted, and grid-connected energy-accumulating power station is simultaneously
It cannot solve these problems.Although at present grid-connected energy-accumulating power station have automatically switch to off-network power station work function, due to by
The limitation of power supply company 10KV/20KV power switching operations permission and the limitation of power grid security regulation, grid-connected power station changes into off-grid operation
Mode can not be switched in time by state's net considerable restraint.Therefore, there are very big need in market to relatively independent off-network energy-accumulating power station
It asks.
It is reported to a higher authorities for approval simultaneously as solar power generation grid-connecting examination & approval at present must provide corresponding entries by user, if without land certificate
And property ownership certificate, it cannot go through to build power station on many houses and soil, having built can not be grid-connected.
Summary of the invention
The purpose of the present invention is to overcome the above shortcomings and to provide it is a kind of can using solar energy storage system as main power supply into
Row work, and switch in energy storage electric flux deficiency situation using state's network source as backup power source, and not by state's net to grid-connected storage
Can the limitation of power plant operation regulation a kind of solar energy off-network energy-accumulating power station and state's network source mixed power supply system.
The object of the present invention is achieved like this:
A kind of solar energy off-network energy-accumulating power station and state's network source mixed power supply system, the 10KV/20KV that it nets state are exchanged
Power supply is connected to user's distribution system by transformer pressure-reducing to 400V, is equipped with that energy-accumulating power station power load is spare to be opened in distribution system
KB, energy-accumulating power station charge switch KA are closed, wherein energy-accumulating power station power load backup circuit breaker KB passes through twin-power switch prefix switch
V11~V1SIt is coupled with double power supply converting switch standby electricity source, then from the leading-out terminal and energy-storage system of double power supply converting switch
Power load connection, energy-accumulating power station charge switch KA are connect with charger, are connected to energy storage electricity by DC cabinet after charger charging
Chi Zuzhong can carry out energy storage to energy-storage battery group using the paddy electricity of state's network source at night；
And off-network solar power generation cell group is housed in solar energy off-network energy-accumulating power station, multiple solar cell modules are through going here and there
Parallel connection is constituted after off-network solar power generation cell group is converged by header box and is connected to DC cabinet, by solar energy electricity to energy storage
Battery pack carries out energy storage or with battery pack together to inverter power supply, and then redundance deposits into battery to electric current greatly, electric current it is small then by
Battery power discharge, is also connected with a branch on the DC cabinet, and branch road passes through that inverter, double power supply converting switch are preposition to be opened
The K of pass11~K1SConnect with primary power cource one end of double power supply converting switch, then by the leading-out terminal of double power supply converting switch with
Energy-storage system power load connection, so that the DC inverter of solar energy off-network energy-storage system be cut at after alternating current through dual power supply
Change the K of switch prefix switch11~K1SIt is connected with the primary power cource end of double power supply converting switch, then passes through double power supply converting switch
Leading-out terminal couples with energy-storage system power load, uses so that the electricity of energy-storage system is sent to energy-storage system power load；
Solar grid-connected cabinet, distribution system incoming switch K, energy-accumulating power station charge switch KA, energy-accumulating power station power load are standby
It is designed with power kilowatt-hour meter with outlet X21~X2S of switch KB and twin-power switch, also all has communication interface, all double electricity
Source switching switch prefix switch K11~K1S, V11~V1S, charger, DC cabinet, header box, inverter, battery management system, energy
Amount management system all has communication interface, is coupled by communication cable, to facilitate Energy Management System to acquire the electricity of each equipment
Parameter, and all devices are controlled by communication interface.
Compared with prior art, the beneficial effects of the present invention are:
A kind of this solar energy off-network energy-accumulating power station and state's network source mixed power supply system can be in solar energy off-network energy-accumulating power stations
It is switched between state's network source according to system operation situation, solar energy off-network energy-accumulating power station and state's network source are completely isolated mutually
Mutually independent, off-network energy-accumulating power station can voluntarily be purchased according to relevant national standard designed, designed and voluntarily be produced, without by state's net
Rules and regulations limitation is checked and accepted, cost can be reduced, Fast Construction benefits the people.After having built energy storage off-grid system, without land certificate
And the fact that property ownership certificate building can also install solar energy additional and directly the direct current of hair and on battery system.In addition it can use
Off-network energy-accumulating power station improves the power supply reliability of some particular job occasions as independent current source all the way.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of solar energy off-network energy-accumulating power station and state's network source mixed power supply system of the present invention.
Wherein: 10KV/20KV AC power source 1, distribution system 2, distribution system incoming switch K, grid-connection cabinet 3, energy storage are netted by state
Power station load backup circuit breaker KB, energy-storage system power load 4, energy-accumulating power station charge switch KA, charger 5, DC cabinet 6,
Energy-storage battery group 7, off-network solar power generation cell group 8, header box 9, inverter 10, twin-power switch prefix switch 11, battery
The fixed power load 14 of management system 12, Energy Management System 13, state's net system.
Specific embodiment
Referring to Fig. 1, the present invention relates to a kind of solar energy off-network energy-accumulating power station and state's network source mixed power supply system, it is by state
The 10KV/20KV AC power source 1 of net is connected to user's distribution system 2 by transformer pressure-reducing to 400V, is equipped with storage in distribution system 2
Energy power station load backup circuit breaker KB, energy-accumulating power station charge switch KA, wherein energy-accumulating power station power load backup circuit breaker KB is logical
Cross the V of twin-power switch prefix switch 1111~V1SIt is coupled with double power supply converting switch standby electricity source, then switches from dual power supply
The leading-out terminal of switch is connect with energy-storage system power load 4, and energy-accumulating power station charge switch KA is connect with charger 5, and charger 5 fills
It is connected in energy-storage battery group 7, energy-storage battery group 7 can be carried out using the paddy electricity of state's network source at night by DC cabinet 6 after electricity
Energy storage；
And off-network solar power generation cell group 8 is housed in solar energy off-network energy-accumulating power station, multiple solar cell module warps
Series-parallel constitute after off-network solar power generation cell group 8 is converged by header box 9 is connected to DC cabinet 6, by solar energy electricity
To energy-storage battery group 7 carry out energy storage or and battery pack together to inverter power supply, then redundance deposits into battery, electric current to electric current greatly
Small that a branch is also connected on the DC cabinet 6 then by battery power discharge, branch road passes through inverter 10, dual power supply switching
Switch the K of prefix switch 1111~K1SConnect with primary power cource one end of double power supply converting switch, then is opened by dual power supply switching
The leading-out terminal of pass is connected to energy-storage system power load 4, thus by the DC inverter of solar energy off-network energy-storage system at exchange
K through double power supply converting switch prefix switch 11 after electricity11~K1SIt is connected with the primary power cource end of double power supply converting switch, then leads to
It crosses double power supply converting switch leading-out terminal to couple with power load 4, so that the electricity of energy-storage system is sent to energy-storage system power load 4
It uses.
Solar grid-connected cabinet, distribution system incoming switch K, energy-accumulating power station charge switch KA, energy-accumulating power station power load are standby
It is designed with power kilowatt-hour meter with outlet X21~X2S of switch KB and twin-power switch, also all has communication interface, all double electricity
Source switching switch prefix switch (or switch control box) K11~K1S, V11~V1S, charger 5, DC cabinet 6, header box 9, inverter
10, battery management system 12, Energy Management System 13 all have communication interface, are coupled by communication cable, to facilitate energy pipe
Reason system 13 acquires the electrical parameter of each equipment, and is controlled by communication interface all devices.
Wireless receiving function is wherein had in Energy Management System 13, can receive weather condition, and is also had previous
The power generation data of solar energy under circumstances, while also there is comparison function, solar energy can be estimated in the hair of some period
Electric data.
This solar energy off-network energy-accumulating power station and state's network source mixed power supply system have duplex feeding power supply, all the way state's net
Power supply, all the way energy-accumulating power station and mutually independence can net electricity to solar energy off-network energy-accumulating power station power supply and state according to actual state
Source switches over, and so, the original grid-connected system of solar energy sells electric qualification there is no need to abandon photovoltaic online, there is extra electricity
It can be sold to state's net, energy-accumulating power station can voluntarily be purchased according to related national standard designed, designed and voluntarily be produced, and state's household electrical appliances are not needed yet
Grid-connected examination is netted, cost, Fast Construction can be reduced.It can also be provided for user all the way not by the standby electricity of Effect of Natural Disaster
Source.
This system has including but not limited to following plurality of operating modes, first assumes peak valley usually section in explanation: 8:00~
The peak 12:00
12:00~17:00 is flat
The peak 17:00~21:00
21:00~24:00 is flat
0:00~8:00 paddy
There is the flat Time segments division of different peak valleys in different provinces, also have different peak valley ordinary telegram valences, can voluntarily adjust.
One, price difference is earned
If state's net system fixed the sum of power load and energy-storage system power load are less than transformer rated power, from
Net energy-accumulating power station, which is operable with, earns price difference state.
If all loads of ∑≤main transformer rated power, operational mode is to backspread, and is made as far as possible in peak potential period
It is powered with energy storage to load as much as possible, until battery is put into 10% or so electricity of residue.10% left side of Yuing is put into battery
When until right electricity, it is online that sub-load is then switched to state in peak potential period, stays sub-load and solar cell power generation power
It is suitable or close, consume solar energy electricity directly in peak potential period.It (can also be byCalculate the average function of work mornings
Rate, the load that then all the morning switches numerical value suitable with its are run to energy-accumulating power station by energy-accumulating power station with firm power).Under
The ordinary telegram period at noon can be online to state all load switchings, allows battery pack using solar recharging, if solar energy installation compared with
More and evening opens night shift, if then generating electricity afternoon again by surplus power band main line load after being filled substantially with battery, to protect battery.
12:00-17:00 in afternoon is the ordinary telegram period, and the operation of ordinary telegram period can also determine substantially operation power in the following manner:
Such as
The above-mentioned numerical value < 0 of fruit, then show that battery is not fully filled 95%, whether can earn flat-peak price difference according to system actual conditions, really
Surely whether start charger after closing load.All loads are all taken all storage electricity all with peak again when evening peak electricity
Electricity is released, and can also be pressedCalculate and stablize close load operation on power band, peak electricity such as put it is endless,
It discharges in late 21:00-24:00 ordinary telegram period, shuts down after discharging again, all load switchings are returned on main transformer.To 12 points of night again into
Row charging.If not opening night shift, afternoon ordinary telegram period, 12:00-17:00 was directly pressedSubstantially power on-load
Operation.To After Hours controlling K by Energy Management System11~K1SIt disconnects, by double power supply automatic switching switch automatically load
It is online to be switched to state, 1~C of inverter is turned off.
Two, compensation capacity mode
If all load > main transformer capacities of ∑, it may be assumed that energy-accumulating power station should provide capacity in peak of power consumption and share task.
System starts access all or part power load 1~M, power load power Z ≈ by following calculation value
B is that 8 points of workings are opened from the morning
The time that the energy-storage system of beginning determination must work, generally 8~16 hours, first by Systematic selection K11~K1SIn several loads
Meet Z performance number, run one hour, i.e. morning 8:00-9:00, records or detect mean power in 8:00-9:00, photovoltaic power generation
Amount, battery dump energy；If:
Then increase power load all the way, under the premise of the main transformer not power transmission into net after meeting excision, from
Switch to come all the way in transformer load, make
If:
Excision power should be then calculated, the present power of main transformer is specified plus not super main transformer after excision power
Power, then reduce similar power load all the way from energy-accumulating power station load currently in use, and excision power R presses following public affairs
Formula calculates:
After the above numerical value calculates,
One is found out from the energy-storage system power load of energy-accumulating power station to cut off with load similar in R value.Such as without close suitable load, then
Jump minimum load (or not cutting off, run by subsequent four mode) all the way.From energy-accumulating power station load switching all the way on main transformer, make
Switching front and back will guarantee not surpass transformer load, also the not power transmission into net, if from main transformer
Excision loads on energy-accumulating power station to cause to transmit electricity into net or cut off to load to all the way on main transformer from energy-accumulating power station all the way to be caused
Main transformer overload carries out above-mentioned calculating again after then postponing 15 minutes and is switched over according to result.
If main transformer power allows, electricity is deposited when battery and is lower than 5%, is all switched on main transformer,
Off-network inverter stops working.If main transformer power does not allow, carried out by operating mode four.
13 moment of Energy Management System monitors each loop parameter and carries out once-through operation per hour, and according to operation result tune
Whole energy-accumulating power station workload increase and decrease.
Three, the super rated power switch protecting mode of main transformer
Which mode of above-mentioned two modes no matter worked in, when system detection to main transformer power P exceed main transformer rated power,
Then Energy Management System selects one to be greater than from energy-storage system power load and as close possible to the negative of P- main transformer rated power
It carries, is resected on energy-accumulating power station from main transformer load, it is ensured that main transformer power is lower than transformer rated power.After switching if:
Then system makes following disposition:
1, main transformer realtime power is detected, transformer rated power-main transformer realtime power is calculated, one is looked for from energy-accumulating power station
Road is suitable therewith, and the load for being slightly less than it is cut off on transformer from energy-accumulating power station, is made
2, energy-accumulating power station is without being equivalent to transformer rated power-main transformer realtime power and smaller load, or even if switching
It not can guarantee afterwards yet
Then start charger, it is specified that charger control charge power under Energy Management System control increases value trace main transformer
Power and main transformer real time load difference make transformer work in the case where not excess determines power rating, until
Then charger stops charging.
If main transformer available power is too small, and energy-storage system overload of power, cause energy-storage battery capacity drop to 5% with
Under, example 4%, then system sounds an alarm and after delay a period of time allows user to react, and starting protection is negative to energy-accumulating power station
Lotus gradually disconnects.Example: K is controlled by Energy Management System11、V11It separates simultaneously, then can disconnect load one；Pass through energy management
System controls K12、V12It separates simultaneously, then can disconnect load two；K is controlled by Energy Management System1S、V1SIt simultaneously switches off, then may be used
Disconnect load S.Until remaining load can ensure that energy-storage system works normally.
Four, energy-accumulating power station off-capacity operating mode
If
And system is not supported on switching part power to transformer (without suitable load, to cut
Changing on main transformer prevents main transformer excess load) or important load from frequent switching, then charger mode is enabled, by Energy Management System
It controls charger and increases powerinjected method main transformer rated power-current realtime power of main transformer.This numerical value charges, until
Until.
If main transformer available power is too small after starting charger, and energy-storage system overload of power, cause energy-storage battery capacity
Dropping to 5% hereinafter, example 4%, then system sounds an alarm and after delay a period of time allows user to react, starting protection,
Energy-accumulating power station load is gradually disconnected.Example: K is controlled by Energy Management System11、V11It separates simultaneously, then can disconnect load one；
K is controlled by Energy Management System12、V12It separates simultaneously, then can disconnect load two；K is controlled by Energy Management System1S、V1STogether
When disconnect, then can disconnect load S.Until remaining load can ensure that energy-storage system works normally.
Five, grid-connected solar energy system power transmission protected mode into net under eekday mode
Once detecting transformer P < 0, belong to and sell electricity into net, then detect energy-accumulating power station state, from energy-accumulating power station load
Switch on several loads to main transformer, makes P >=0.If energy-accumulating power station whole load all has been switched on main transformer or P < 0, then control
Charger charges to energy-storage battery, and charge power is
Such as
Y < 0 then shows that solar energy electricity battery can fill any more, then must assure that energy-storage system on-load:
In energy-accumulating power station band certain load, grid-connected solar battery group electricity is too many, can only allow grid-connected
The certain power of system power transmission into net.
Six, holiday mode
Under holiday mode, the actual power of the fixed power load of energy-storage system power load, state's net system is all greatly decreased,
In this case, system can only be allowed to send power into net by main transformer, simultaneously because energy-accumulating power station is not grid-connected, energy-accumulating power station
On solar energy must be consumed by energy-storage system power load.Therefore, all loads of energy-storage system power load are all hung
On energy-accumulating power station.The daytime that operational management personnel should input energy-storage system power load under a holiday mode to system is used
Electric discreet value.Meanwhile Energy Management System calculates a holiday solar power generation amount, root according to weather forecast and current date
Calculate what degree night 0:00~8:00 energy-accumulating power station should be charged to according to above-mentioned data.
Final electricity storage-solar energy holiday is estimated when battery 0:00~8:00 permission charge capacity=battery sun sets
Generated energy+load electricity consumption on daytime
The battery sun allows 95% capacity when setting, can thus calculate battery allow night maximum charge to what
Degree, meanwhile, system is powered to whole energy-storage system power loads always, and when night 12 or battery exhausts.Such as
Because cost reason causes battery capacity too small when fruit battery system is arranged, and solar energy installed capacity is too big, holiday mode electricity consumption
Measure too small, then battery night should be charged to half or less, enable battery in the morning 8:00 later if it is sun rainy days
The operation of energy holding load 4 when energy generated energy is lesser.Meanwhile after battery is full of daytime by solar energy, if load function
When rate is less than the generated output of off-network solar power generation cell group 8, Energy Management System should be able to control part or complete in DC cabinet
Portion's header box solar energy input switch carries out the separating brake under automatic or manual control, protects battery pack with optical mode is abandoned, makes remainder
Off-network solar power generation power and energy storage load it is substantially suitable, and change over time corresponding adjustment (cut off or close) header box
Solar energy input switch, it is ensured that battery does not overcharge.
Seven, battery protection operational mode
Under special circumstances, solar power generation power is larger, and energy-storage system power load because maintenance reason or other
Reason power is too small, and energy-storage battery group is caused to be full of, then system alarm and starts battery pack protection mode, by Energy Management System
Instruction is issued, automatic or manual completion DC cabinet confluence switch sections or all off carry out abandoning light, until off-network solar energy is sent out
Power consumption and load it is basic quite until, and with solar energy the time in the afternoon gradually reduce and gradually partly or entirely disconnecting
DC cabinet solar energy confluence switch another one close, keep energy-storage battery group, solar energy input and inversion output three it
Between balance.
Eight, multiple inverter parallel modes
Energy storage power and solar energy input enabled condition under, system support 1~C parallel running, except First for from
Outside net voltage source, remaining is grid-connected current source.Assuming that single inverter power is D1, D2 ... DS, it can more power phases
Deng, can also power differ.Assuming that power load 1, power load 2 ... power load M power is P1, P2 ... PS.For side
Just inverter exchanges maintenance and control, the same model inverter that system generally uses power equal, power D.Then: ifThen system enables an inverter；Then system enables two inverters, similarlyThen system enables S platform inverter, and as load power variation gradually reduces or increases
Inverter, until being only left one or all startings, after all startings, ifThen energy management
System is on the load switching to state's net system beyond S*D.
Nine, the operational mode under state's net power loss
Once natural calamities or the wars such as lightning stroke, heavy rain, typhoon or other power supply power generation transmission failures occur, make external power
10KV/20KV can not power, then Energy Management System 13 can be found that 10KV/20KV system power loss by the communication with W/P, be
System enters the operational mode under state's net power loss.
Since off-network energy-accumulating power station energy storage is limited, once state's net power failure state occurs, operation maintenance personnel should confirm state's net
The power loss time is short-term or the long period.Under normal circumstances, long-term in the category of state's net power loss caused by natural calamity, war
, and overhaul to have a power failure caused by power supply power generation transmission failure and belong in short-term.
If causing the accident that state's net has a power failure is judged as long-term, more than 24 hours, then system was at once according to following power
It calculates and determines daytime and night load, if the normal daily generated energy of 50% solar energy current season of battery capacity <:
First day daytime load:
Night load:
Second day beginning load on daytime:
X can determine suitable number according to night electricity consumption
Value.
When the normal daily generated energy of 50% solar energy current season of battery capacity >
Uniform load in daylight and at nightAs in daylight and at night
Load is uneven, can adjust according to the actual situation.
During operation, measured by Energy Management System 13 or following parameters be calculated and displayed: battery deposit at present electricity,
Allow to run power, run power, the same day at present and consumed the practical generated energy of electricity, same day solar energy, by current state system
System can hours run etc., select to show by operation maintenance personnel.
Since solar power generation has very big uncertainty, while without backup power source or supplement power supply.Therefore, it is suggested that
Determine how many load opened according to weather condition by operation maintenance personnel；And load is manually adjusted according to weather condition.
Energy Management System 13 gives a warning in situations, carries out corresponding load shedding or its elsewhere by operation maintenance personnel
Reason.
WhenThen issue energy storage electricity
Operation of standing was alerted less than X minutes.
X can be from: taking in the parameters such as 15 minutes, 30 minutes, 60 minutes, 90 minutes, 120 minutes.(note one: if it is confirmed that
Power failure be it is long-term, then the grid-connection cabinet power outlet of solar grid-connected electricity generation system should be connected to the output of inverter 1,2 ... C
End.Charger access is connected to the leading-out terminal of inverter 1,2 ... C.Inverter 1 provides off-network voltage source, is passed through by EMS logical
News obtain the real-time generated output and the real-time consumption power of load of grid-connected solar energy system.It is real in grid-connected solar energy output power >
When the load of border, start charger, the extra electricity that protosun energy grid-connected system is generated, after becoming direct current from EMS control charger
Deposit into energy-storage battery group.When solar grid-connected power is less than actual loading, discharged by energy-storage battery.If the inverter selected
Having one in 2~C is charging inversion all-in-one machine, then only the solar grid-connected cabinet outlet of reconfiguration does not need handle and fill to inverter outlet
5 ac power input end of motor is connected to inverter output end, directly controls one according to operating condition by Energy Management System 13
The operational mode of machine.Grid-connected system solar energy track remodelling is connected to after off-grid system in calculation formula solar energy electricity includes
Off-network and grid-connected two systems solar energy electricity.)
If the accident that state's net has a power failure is judged as short-term (referring to less than 24 hours), can be calculated according to following power true
Determine suitable load,Beyond negative
Load is cut off without exception.And controlled in period by Energy Management System 13 or operation maintenance personnel, according to solar battery actual power generation and
Actual load power, makes adjustment to load.Solar grid-connected system can not change wiring.
Claims (7)
1. a kind of solar energy off-network energy-accumulating power station and state's network source mixed power supply system, it is characterised in that: the 10KV/ that it nets state
20KV AC power source (1) is connected to user's distribution system (2) by transformer pressure-reducing to 400V, and energy storage is equipped in distribution system (2)
Power station load backup circuit breaker (KB), energy-accumulating power station charge switch (KA), wherein energy-accumulating power station power load backup circuit breaker
(KB) pass through the V of twin-power switch prefix switch (11)11~V1SIt is coupled with double power supply converting switch standby electricity source, then from double
The leading-out terminal of power change-over switch is connect with energy-storage system power load (4), energy-accumulating power station charge switch (KA) and charger (5)
Connection is connected in energy-storage battery group (7) after charger (5) charging by DC cabinet (6), can utilize the paddy of state's network source at night
Electricity carries out energy storage to energy-storage battery group (7)；
And off-network solar power generation cell group (8) is housed in solar energy off-network energy-accumulating power station, multiple solar cell modules are through going here and there
Parallel connection is constituted after off-network solar power generation cell group (8) are converged by header box (9) and is connected to DC cabinet (6), and solar energy is sent out
Electricity to energy-storage battery group (7) carry out energy storage or with battery pack together to inverter power supply, then redundance deposits into electricity to electric current greatly
Pond, electric current is small then by battery power discharge, is also connected with a branch on the DC cabinet (6), branch road pass through inverter (10),
(the K of double power supply converting switch prefix switch (11)11)~(K1S) connect with primary power cource one end of double power supply converting switch, then
It is connected to by the leading-out terminal of double power supply converting switch with energy-storage system power load (4), thus by solar energy off-network energy-storage system
DC inverter at after alternating current through double power supply converting switch prefix switch (11) its (K11)~(K1S) opened with dual power supply switching
The primary power cource end of pass is connected, then is coupled by double power supply converting switch leading-out terminal with energy-storage system power load (4), thus handle
The electricity of energy-storage system is sent to energy-storage system power load (4) use；
Solar grid-connected cabinet, distribution system incoming switch (K), energy-accumulating power station charge switch (KA), energy-accumulating power station power load are standby
It is designed with power kilowatt-hour meter with outlet (X21)~(X2S) of switch (KB) and twin-power switch, also all has communication interface, institute
There is double power supply converting switch prefix switch (K11)~(K1S), (V11)~(V1S), charger (5), DC cabinet (6), header box (9),
Inverter (10), battery management system (12), Energy Management System (13) all have communication interface, are coupled by communication cable,
To facilitate Energy Management System (13) to acquire the electrical parameter of each equipment, and all devices are controlled by communication interface.
2. a kind of solar energy off-network energy-accumulating power station and state's network source mixed power supply system, it is characterised in that: the system, which has, earns difference
The operational mode of valence:
If all loads of ∑≤main transformer rated power, operational mode is to backspread, in peak potential period using energy storage to more
A load power supply, until battery is put into remaining 10% electricity；It is online that sub-load is then switched to state in peak potential period, stays portion
Point load is suitable or close with solar cell power generation power, consumes solar energy electricity directly in peak potential period, can also be with
It presses
The mean power of work mornings is calculated, then switches the load of suitable with its numerical value to energy-accumulating power station by energy storage in the morning
Power station is run with firm power；The ordinary telegram period can be online to state all load switchings in the afternoon, and battery pack is allowed to utilize the sun
It can charge, if solar energy installation is more and works at night, if generating electricity afternoon after being full of battery again by surplus power band main line
Load, to protect battery, operation can also determine operation power the 12:00-17:00 ordinary telegram period in the afternoon in the following manner:
If above-mentioned numerical value < 0, show that battery is not fully filled 95%, when evening peak electricity is again all taken all loads by all storages
Electricity is deposited all with the releasing of peak electricity, can also be pressedIt calculates and stablizes close load operation on power band,
Peak electricity such as put it is endless, then late 21:00-24:00 ordinary telegram period discharge, shut down after discharging, all load switchings return main transformer
On, it charges again to 12 points of night；If do not worked at night, directly press the 12:00-17:00 ordinary telegram period in the afternoonPower load carrying, stops working
When by Energy Management System control K11~K1S disconnect, by double power supply automatic switching switch automatically load switching to state's net
On, 1~C of inverter is turned off.
3. a kind of solar energy off-network energy-accumulating power station and state's network source mixed power supply system, it is characterised in that: the system has compensation
The operational mode of capacity:
If all load > main transformer capacities of ∑, it may be assumed that energy-accumulating power station should provide capacity in peak of power consumption and share task.
System starts access 1~M of all or part of power load, power load power by following calculation valueB is what energy-storage system must work
Time, first by Systematic selection K11~K1SIn several loads meet Z performance number, if:
Then increase power load all the way, under the premise of the main transformer not power transmission into net after meeting excision, from transformation
Switch to come all the way in device load, make
If:
Excision power should be then calculated, the present power of main transformer is plus not super main transformer volume after excision power
Determine power, then reduces similar power load all the way from energy-accumulating power station load currently in use, excision power R is by following
Formula calculates:
Cut off power R meter
After calculating, one is found out from the energy-storage system power load of energy-accumulating power station and is cut off with load similar in R value, such as without close suitable
Load then jumps minimum load all the way, from energy-accumulating power station load switching all the way on main transformer, makes
4. a kind of solar energy off-network energy-accumulating power station and state's network source mixed power supply system, it is characterised in that: the system has main transformer
Super rated power switch protecting operational mode:
When system detection to main transformer power P exceeds main transformer rated power, then Energy Management System is from energy-storage system power load
Selection one is slightly larger than the load of P- main transformer rated power, is resected on energy-accumulating power station from main transformer load, it is ensured that main transformer power
Lower than transformer rated power, after switching if: Then system makes following disposition:
Main transformer realtime power is detected, transformer rated power-main transformer realtime power is calculated, is looked for from energy-accumulating power station all the way therewith
Quite, and it is slightly less than its load and is cut off on transformer from energy-accumulating power station, makes
Energy-accumulating power station is without being equivalent to transformer rated power-main transformer realtime power and smaller load, or nothing after switching
Method guarantees
Then start charger, makes transformer work in the case where not excess determines power rating, until
Then charger stops charging；
If main transformer available power is too small, and energy-storage system overload of power, energy-storage battery capacity is caused to drop to 5% hereinafter, then
System gradually disconnects energy-accumulating power station load, until remaining load can ensure that energy-storage system works normally.
5. a kind of solar energy off-network energy-accumulating power station and state's network source mixed power supply system, it is characterised in that: the system has energy storage
The operational mode of station capacity deficiency work:
If And system is not supported on switching part power to transformer or important load cannot
Frequent switching then enables charger mode, increases powerinjected method main transformer rated power-master by Energy Management System control charger
Becoming current realtime power, this numerical value charges, until
If main transformer available power is too small after starting charger, and energy-storage system overload of power, cause energy-storage battery capacity to decline
To 5% hereinafter, then system gradually disconnects energy-accumulating power station load, until remaining load can ensure that energy-storage system works normally.
6. a kind of solar energy off-network energy-accumulating power station and state's network source mixed power supply system, it is characterised in that: the system has non-vacation
Grid-connected solar energy system power transmission protected mode into net under day mode:
Once detecting transformer P < 0, belong to and sell electricity into net, then detect energy-accumulating power station state, switches from energy-accumulating power station load
On several loads to main transformer, make P>=0, if energy-accumulating power station whole load all has been switched on main transformer or P<0, then controls charging
Machine charges to energy-storage battery, and charge power isSuch as Y < 0, then
Show that solar energy electricity battery can fill any more, then must assure that
7. a kind of solar energy off-network energy-accumulating power station and state's network source mixed power supply system, it is characterised in that: the system has multiple
Inverter parallel mode:
Under energy storage power and solar energy input enabled condition, system supports 1~C parallel running, except First is off-network electricity
Outside potential source, remaining is grid-connected current source, ifThen system enables an inverter；Then system enables two inverters, similarlyThen system opens
With S platform inverter, and as load power variation gradually reduces or increase inverter, it is until being only left one or all starting
Only, after all startings, ifThen Energy Management System is the load switching beyond S*D to state's net system
On.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811125615.1A CN109103932A (en) | 2018-09-26 | 2018-09-26 | A kind of solar energy off-network energy-accumulating power station and state's network source mixed power supply system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811125615.1A CN109103932A (en) | 2018-09-26 | 2018-09-26 | A kind of solar energy off-network energy-accumulating power station and state's network source mixed power supply system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110474363A (en) * | 2019-07-26 | 2019-11-19 | 江阴市新昶虹电力科技股份有限公司 | Off-network energy-accumulating power station and its working method with grid-connected function and energy direct grid-connected |
-
2018
- 2018-09-26 CN CN201811125615.1A patent/CN109103932A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110474363A (en) * | 2019-07-26 | 2019-11-19 | 江阴市新昶虹电力科技股份有限公司 | Off-network energy-accumulating power station and its working method with grid-connected function and energy direct grid-connected |
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Application publication date: 20181228 |