CN104795832B - Photovoltaic electric energy management method and system and electric energy distribution control device - Google Patents
Photovoltaic electric energy management method and system and electric energy distribution control device Download PDFInfo
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- CN104795832B CN104795832B CN201510202210.3A CN201510202210A CN104795832B CN 104795832 B CN104795832 B CN 104795832B CN 201510202210 A CN201510202210 A CN 201510202210A CN 104795832 B CN104795832 B CN 104795832B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The invention discloses a kind of photovoltaic electric energy management method and system and electric energy distribution control device.The photovoltaic electric energy management system includes the electric energy distribution control device of photovoltaic generating system, power transmission network and load, battery and one end connection photovoltaic generating system, other end connection power transmission network and load and battery.When the electric energy distribution control device is used to get the photovoltaic electric energy of photovoltaic generating system input, powering mode is presently in based on it and determines matching electric energy allocative decision, according to electricity or load supplying demand on power transmission network, perform corresponding electric energy between battery, power transmission network or load using the electric energy allocative decision and share out the work.Photovoltaic electric energy management system of the present invention can be according to electricity or load supplying demand on power transmission network, and its photovoltaic electric energy is carried out reasonable distribution by residing powering mode between battery, load or power transmission network, both customer power supply demand had been met, the waste of photovoltaic electric energy more than needed is turn avoid, the utilization rate of photovoltaic electric energy is improved.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, more specifically to a kind of photovoltaic electric energy management method and system,
And electric energy distribution control device.
Background technology
In recent years, new energy photovoltaic generation is widely applied, and energy-storage system is by the unnecessary power storage of photovoltaic generation
In the energy-storage units such as battery, it is that load or power network are powered that the electric energy in energy-storage units is discharged in dim light, realizes that the energy is stabilized,
More smoothly to use the positive energy in day.
At present, photovoltaic generation has AC to couple to couple two kinds of sides with DC side with the scheme that energy storing and electricity generating is used in conjunction with
Formula, wherein, AC coupled modes exchanger energy loss is larger, and DC side coupling energy loss is smaller.But, DC side coupling
The mode of conjunction is typically that photovoltaic generating system and battery are merged together by DC-DC converter, reconnects inverter,
This system architecture has energy pathway farther out and the problem of energy loss is larger.
The content of the invention
There is provided a kind of photovoltaic electric energy management for the drawbacks described above that the technical problem to be solved in the present invention is for prior art
Method and system and electric energy distribution control device.
The technical solution adopted for the present invention to solve the technical problems is：A kind of photovoltaic electric energy management method is constructed, including
Following steps：
S1, judge electric energy distribution control device be presently in powering mode；
S2, get photovoltaic generating system input photovoltaic electric energy when, it is determined that with electric energy distribution control device currently supply
The electric energy allocative decision that power mode matches, according to electricity or load supplying demand on power transmission network, exists using the electric energy allocative decision
Corresponding electric energy is performed between battery, power transmission network or load to share out the work.
In above-mentioned photovoltaic electric energy management method of the invention, methods described also includes following step before the step S1
Suddenly：
S0, by DC-to-dc reversible transducer or two-way inverter photovoltaic generating system input current is carried out it is real-time
Sampling, the current peak power output of photovoltaic generating system is calculated according to sampled result, current maximum defeated according to photovoltaic generating system
Go out power and dynamic regulation is carried out to DC bus-bar voltage.
In above-mentioned photovoltaic electric energy management method of the invention, the distribution of electric energy described in step S1 control device work as described
In off-network powering mode, then the step S2 is accordingly including following sub-step：
S21, two-way inverter determine the first electric energy point matched with off-network powering mode residing for electric energy distribution control device
With scheme, it will be converted to based on the Part I photovoltaic electric energy that the first electric energy allocative decision is assigned to after alternating current for load；
The Part II photovoltaic electric energy that S22, DC-to-dc reversible transducer will be assigned to based on the first electric energy allocative decision
Carry out being stored in battery after decompression processing, or battery discharges the part electric energy of storage according to the first electric energy allocative decision,
Boosting processing is carried out through DC-to-dc reversible transducer, and for load after being converted to alternating current through two-way inverter；
Wherein, the first electric energy allocative decision is realized based on the first electric energy power distribution formula, the first electric energy work(
Rate distribution formula is expressed as follows：Poutput(max)=Pbattery+Pload；
Poutput(max)Represent that photovoltaic generating system provides the peak power output of photovoltaic electric energy；
PloadExpression electric energy distribution control device distributes and is supplied in first of load when working in off-network powering mode
Light splitting lies prostrate the power output of electric energy；
PbatteryRepresent that electric energy distribution control device distributes and be stored in the of battery when working in off-network powering mode
Two part photovoltaic electric energy or battery discharge the power output of electric energy.
In above-mentioned photovoltaic electric energy management method of the invention, the step S22 also includes：
S221, such as Pload＞ Poutput(max), then judge that load supplying is not enough, is switched to discharge mode by battery, will store
Battery carries out voltage increase through direct current according to the first electric energy allocative decision release electric energy through DC-to-dc reversible transducer, with
And for load after through inverter being converted to alternating current；
Wherein, the power output of battery can be calculated by the first battery discharging formula and obtained, and first battery is put
Electric formula is expressed as follows：Pbatteryoutput=Pload-Poutput(max)；
PbatteryoutputRepresent that battery discharges the power output of electric energy under discharge mode；
S222, such as Pload＜ Poutput(max), then judge that photovoltaic generating system output photovoltaic electric energy is present more than needed, by battery
Charge mode is switched to, storage is stored in after the photovoltaic electric energy progress decompression processing more than needed to this of DC-to-dc reversible transducer
Battery；
The power output of the photovoltaic electric energy of the flap portion can be calculated by the first battery charge formula and obtained, and this first
Battery charge formula is expressed as follows：Psuplus=Poutput(max)-Pload；
PsuplusRepresent the power output of the photovoltaic electric energy more than needed；
Poutput(max)Represent that photovoltaic generating system provides the peak power output of photovoltaic electric energy；
PloadExpression electric energy distribution control device distributes and is supplied in first of load when working in off-network powering mode
Light splitting lies prostrate the power output of electric energy.
In above-mentioned photovoltaic electric energy management method of the invention, the distribution of electric energy described in step S1 control device work as described
In grid-connected powering mode, then the step S2 is accordingly including following sub-step：
S21 ', DC-to-dc reversible transducer determine what is matched with grid-connected powering mode residing for electric energy distribution control device
Second electric energy allocative decision, the Part III photovoltaic electric energy being assigned to based on the second electric energy allocative decision is carried out after decompression processing
It is stored in battery；
S22 ', two-way inverter will be converted to friendship based on the Part IV photovoltaic electric energy that the second electric energy allocative decision is assigned to
It is after stream electricity that its is grid-connected；
Wherein, the second electric energy allocative decision is realized based on the second electric energy power distribution formula, the second electric energy power
Distribution formula is expressed as follows：Poutput(max)=Pbattery+Pgrid；
Poutput(max)Represent that photovoltaic generating system provides the peak power output of photovoltaic electric energy；
PgridRepresent when electric energy distribution control device works in grid-connected powering mode and online electricity Part III photovoltaic electric
The power output of energy；
PbatteryRepresent that electric energy distributes the Part IV that battery is stored in when control device works in grid-connected powering mode
Photovoltaic electric energy or battery discharge the power output of electric energy.
In above-mentioned photovoltaic electric energy management method of the invention, the step S22 ' also includes：
S221 ', such as Pgrid＞ Poutput(max), then photovoltaic generating system supply photovoltaic electric energy Shortcomings are judged, by electric power storage
Pond is switched to discharge mode, and the electric energy that battery is discharged according to the second electric energy allocative decision is double through DC-to-dc through direct current
Voltage increase is carried out to converter, and after being converted to alternating current through inverter and online electricity；
Wherein, the power output of battery can be calculated by the second battery discharging formula and obtained, and second battery is put
Electric formula is expressed as follows：Pbatteryoutput=Pgrid-Poutput(max)；
PbatteryoutputRepresent that battery discharges the power output of electric energy in discharge mode；
Poutput(max)Represent that photovoltaic generating system provides the peak power output of photovoltaic electric energy；
PgridRepresent when electric energy distribution control device works in grid-connected powering mode and online electricity Part III photovoltaic electric
The power output of energy；
S222 ', such as Pgrid＜ Poutput(max), then judge that photovoltaic generating system output photovoltaic electric energy is present more than needed, by electric power storage
Pond is switched to charge mode, is stored up after the photovoltaic electric energy progress decompression processing more than needed to this of DC-to-dc reversible transducer
It is stored in battery；
The power output of the photovoltaic electric energy more than needed can be calculated by the second battery charge formula and obtained, second electric power storage
Pond charge formula is expressed as follows：Psuplus=Poutput(max)-Pgrid；
PsuplusRepresent the power output of the photovoltaic electric energy more than needed.
In above-mentioned photovoltaic electric energy management method of the invention, the step S0 also includes following sub-step：
S01, such as judge that photovoltaic generating system works in Night according to photovoltaic generating system input current sampled result,
DC bus-bar voltage is accordingly then turned down by DC-to-dc reversible transducer or two-way inverter, while starting anti-reversing clutch；
S02, such as judge photovoltaic power generation system output power beyond negative according to photovoltaic generating system input current sampled result
The rated power sum of load and battery, then accordingly raise direct current female by DC-to-dc reversible transducer or two-way inverter
Line voltage.
The present invention also constructs a kind of photovoltaic electric energy management system, including photovoltaic generating system, power transmission network and load, electric power storage
The electric energy distribution control of pond, in addition to one end connection photovoltaic generating system, other end connection power transmission network and load and battery
Device：
It is current based on its when the electric energy distribution control device is used to get the photovoltaic electric energy of photovoltaic generating system input
Residing powering mode determines matching electric energy allocative decision, according to electricity or load supplying demand on power transmission network, using the electricity
Energy allocative decision performs corresponding electric energy between battery, power transmission network or load and shared out the work.
The present invention also constructs a kind of electric energy applied to photovoltaic electric energy management system and distributes control device, the electric energy distribution
Control device includes：
The anti-reversing clutch of dc bus is connected to, for preventing photovoltaic generating system input current from producing adverse current；
Two-way inverter, will be based on the first electricity during for judging that electric energy distribution control device works in off-network powering mode
The Part I photovoltaic electric energy that energy allocative decision is assigned to is converted to for load after alternating current, and for judging that electric energy is distributed
When control device is in grid-connected powering mode, the Part IV photovoltaic electric energy being assigned to based on the second electric energy allocative decision is changed
To be grid-connected after alternating current；
DC-to-dc reversible transducer, for judging that electric energy distribution control device works in off-network powering mode and electric power storage
When pond is in charge mode, the Part II photovoltaic electric energy being assigned to based on the first electric energy allocative decision is carried out after decompression processing
It is stored in battery；
And during for judging that electric energy distribution control device works in off-network powering mode and battery is in discharge mode,
The battery electric energy discharged based on the second electric energy allocative decision is subjected to boosting processing, and alternating current is converted to through two-way inverter
Afterwards for load.
In above-mentioned electric energy distribution control device of the invention, the first MPPT built in the DC-to-dc reversible transducer is controlled
Device processed, the second MPPT controller built in the two-way inverter, first MPPT controller and second MPPT controller
It is used to carry out real-time sampling to photovoltaic power generation system output power, calculates the current peak power output of photovoltaic generating system, root
Dynamic regulation is carried out to DC bus-bar voltage according to photovoltaic generating system current peak power output.
Implement photovoltaic electric energy management method of the present invention and system and electric energy distribution control device, can reach following beneficial
Effect：
1st, photovoltaic electric energy management system of the present invention can be distributed and control according to electricity or load supplying demand on power transmission network with reference to electric energy
Powering mode residing for device processed is closed the photovoltaic electric energy that photovoltaic generating system is inputted between battery, load or power transmission network
Reason distribution, had both met customer power supply demand, and turn avoid the waste of photovoltaic electric energy more than needed, saved fuel source, improved
The utilization rate of photovoltaic electric energy.
2nd, electric energy distribution control device can be by DC-to-dc reversible transducer or two-way inverter to photovoltaic generating system
Input current carries out real-time sampling, calculates the current peak power output of photovoltaic generating system, current most according to photovoltaic generating system
Big power output carries out dynamic regulation to DC bus-bar voltage, realize and busbar voltage voltage stabilizing is controlled, it is to avoid overvoltage causes electricity
The damage of control device internal component can be distributed.
3rd, electric energy distribution control device of the present invention is provided with automatic protection mechanism.As electric energy distribution control device is sent out according to photovoltaic
Electric system input current sampled result judges that photovoltaic generating system works in Night, then passes through DC-to-dc two-way changing
Device or two-way inverter accordingly turn down DC bus-bar voltage, while starting anti-reversing clutch, prevent bus high pressure from pouring into photovoltaic cell
Plate；As electric energy distribution control device judges photovoltaic power generation system output power according to photovoltaic generating system input current sampled result
Beyond load and the rated power sum of battery, then accordingly raised by DC-to-dc reversible transducer or two-way inverter
DC bus-bar voltage is prevented to accumulator super-charge or DC-to-dc reversible transducer overload with deviateing the operation of MPPT points.
Brief description of the drawings
The flow chart of one specific embodiment of the photovoltaic electric energy management method that Fig. 1 provides for the present invention；
Fig. 2 is the method flow diagram for the first electric energy allocative decision being related in the photovoltaic electric energy management method shown in Fig. 1；
Fig. 3 is the method flow diagram for the second electric energy allocative decision being related in the photovoltaic electric energy management method shown in Fig. 1；
The structured flowchart of one specific embodiment of the photovoltaic electric energy management system that Fig. 4 provides for the present invention；
Fig. 5 is that the electric energy of the photovoltaic electric energy management system shown in Fig. 4 distributes the structured flowchart of control device.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described.Based on the embodiment in the present invention,
The every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, belongs to this hair
The scope of bright protection.
The present invention proposes a kind of photovoltaic electric energy management method, and this method can be according to simultaneously online electricity or the power supply need of load 300
Photovoltaic electric energy exported to photovoltaic generating system 100 and carry out reasonable distribution, improved the utilization rate of photovoltaic electric energy, saved fuel
Resource, serves for energy-saving and emission-reduction and certain advocates effect.
Fig. 1 shows the flow chart of the photovoltaic electric energy management method of first embodiment of the invention.As shown in figure 1, the light
Volt electric energy management method comprises the following steps：
In step S101 first, electric energy distribution control device 200 is adopted in real time to the input current of photovoltaic generating system 100
Sample, calculates the current peak power output of photovoltaic generating system 100, according to the current peak power output pair of photovoltaic generating system 100
DC bus-bar voltage carries out dynamic regulation, realizes and busbar voltage voltage stabilizing is controlled.
As electric energy distribution control device 200 judges photovoltaic generation according to the input current sampled result of photovoltaic generating system 100
System 100 works in Night, then accordingly turns down direct current by DC-to-dc reversible transducer 203 or two-way inverter 202
Busbar voltage, while starting anti-reversing clutch 201, prevents bus high pressure from pouring into photovoltaic battery panel.
As electric energy distribution control device 200 judges photovoltaic generation according to the input current sampled result of photovoltaic generating system 100
The power output of system 100 then passes through DC-to-dc reversible transducer beyond load 300 and the rated power sum of battery 500
203 or two-way inverters 202 accordingly rise DC bus-bar voltage to deviate the operation of MPPT points, prevent from overcharging battery 500 or
DC-to-dc reversible transducer 203 overloads.
In later step S102, judge that electric energy distribution control device 200 is presently in powering mode.
In later step S1031, electric energy distribution control device 200 is held after working in off-network powering mode, step S1031
Row step S1041.
Or in step S1032, electric energy distribution control device 200 is held after working in grid-connected powering mode, step S1032
Row step S1042.
In later step S1041, DC-to-dc reversible transducer 203 determine with electric energy distribution control device 200 it is residing from
First electric energy allocative decision of net powering mode matching, according to 300 needs for electricity are loaded, is storing according to the first electric energy allocative decision
Corresponding electric energy is performed between battery 500 and load 300 to share out the work.
Or in step S1042, two-way inverter 202 is determined and grid-connected power supply mould residing for electric energy distribution control device 200
Second electric energy allocative decision of formula matching, according to electric demand on power transmission network 400, according to the second electric energy allocative decision in battery
Corresponding electric energy is performed between 500 and power transmission network 400 to share out the work.
Fig. 2 shows one of the first electric energy allocative decision under the off-network powering mode in Fig. 1 disclosed in step S104
The method flow diagram of specific embodiment, as shown in Fig. 2 step S104 further comprises following sub-step：
In step S10411 first, two-way inverter 202 determines to power mould with off-network residing for electric energy distribution control device 200
First electric energy allocative decision of formula matching, will be converted to based on the Part I photovoltaic electric energy that the first electric energy allocative decision is assigned to
Supply load 300 after alternating current.
In the present invention, above-mentioned first electric energy allocative decision is realized based on the first electric energy power distribution formula, first electricity
Energy power distribution formula is expressed as follows：Poutput(max)=Pbattery+Pload；
Poutput(max)Represent that photovoltaic generating system 100 provides the peak power output of photovoltaic electric energy；
PloadRepresent to be supplied in first that loads 300 when electric energy distribution control device 200 works in off-network powering mode
Light splitting lies prostrate the power output of electric energy；
PbatteryRepresent that electric energy distribution control device 200 is stored in the of battery 500 when working in off-network powering mode
Two part photovoltaic electric energy or battery 500 discharge the power output of electric energy.
In later step S10412, DC-to-dc reversible transducer 203 combines light according to the first electric energy allocative decision
Working mould residing for the current peak power output of photovoltaic generating system 100 and power transmission network 400 and online electric demand switching battery 500
Formula.
When electric energy of the present invention distribution control device 200 is in off-network powering mode, the mode of operation of battery 500 switched
Journey is as follows：
Such as Pload＞ Poutput(max), then judge 300 electricity shortages of load, battery 500 be switched to discharge mode, will be stored
Battery 500 discharges electric energy according to the first electric energy allocative decision and carried through direct current through the progress voltage of DC-to-dc reversible transducer 203
Rise, and for load 300 after being converted to alternating current through inverter；
Wherein, the power output of the release of battery 500 electric energy can be calculated by the first battery discharging formula and obtained, the storage
The electric discharge formula of battery 500 is expressed as follows：Pbatteryoutput=Pload-Poutput(max)；
PbatteryoutputRepresent that battery 500 discharges the power output of electric energy under discharge mode.
Such as Pload＜ Poutput(max), then judge that the output photovoltaic electric energy of photovoltaic generating system 100 is present more than needed, by battery
500 are switched to charge mode, and being carried out by 203 pairs of photovoltaic electric energy more than needed of DC-to-dc reversible transducer will after decompression processing
It is stored in battery 500；
The power output of the photovoltaic electric energy of the flap portion can be calculated by the first battery charge formula and obtained, and this first
Battery charge formula is expressed as follows：Psuplus=Poutput(max)-Pload；
PsuplusRepresent the power output of the photovoltaic electric energy more than needed；
Poutput(max)Represent that photovoltaic generating system 100 provides the peak power output of photovoltaic electric energy；
PloadRepresent to distribute and be supplied in load 300 when electric energy distribution control device 200 works in off-network powering mode
The power output of Part I photovoltaic electric energy.
In later step S10413, DC-to-dc reversible transducer 203 is current maximum defeated according to photovoltaic generating system 100
Go out power and battery 500 is switched to charge mode by 300 power demands of load.
In later step S10414, DC-to-dc reversible transducer 203 will be distributed based on the first electric energy allocative decision
Two part photovoltaic electric energy are stored in battery 500 after carrying out decompression processing.
Or in step S10415, battery 500 is switched to discharge mode, electric power storage by DC-to-dc reversible transducer 203
Pond 500 discharges part electric energy according to the first electric energy allocative decision, and 203 pairs of the DC-to-dc reversible transducer part electric energy is carried out
Boosting is handled, for load 300 after being converted to alternating current through two-way inverter 202.
Fig. 3 shows a specific embodiment of the second electric energy allocative decision disclosed in step S1042 in Fig. 1 of the present invention
Method flow diagram.As shown in figure 3, step S1042 specifically includes following sub-step：
In step S10421 first, DC-to-dc reversible transducer 203 determines to distribute residing for control device 200 with electric energy
Second electric energy allocative decision of grid-connected powering mode matching, two-way inverter 202 will be assigned to based on the second electric energy allocative decision
Part II photovoltaic electric energy be converted to after alternating current for load 300.
In the present invention, the second electric energy allocative decision is realized based on the second electric energy power distribution formula, second electric energy
Power distribution formula is expressed as follows：Poutput(max)=Pbattery+Pgrid；Wherein：
Poutput(max)Represent that photovoltaic generating system 100 provides the peak power output of photovoltaic electric energy；
PgridRepresent when electric energy distribution control device 200 works in grid-connected powering mode and online electricity Part III photovoltaic
The power output of electric energy；
PbatteryRepresent to distribute and be stored in battery when electric energy distribution control device 200 works in grid-connected powering mode
500 Part IV photovoltaic electric energy or battery 500 discharges the power output of electric energy.
In later step S10422, DC-to-dc reversible transducer 203 combines light according to the second electric energy allocative decision
Working mould residing for the current peak power output of photovoltaic generating system 100 and power transmission network 400 and online electric demand switching battery 500
Formula.
When electric energy of the present invention distribution control device 200 is in grid-connected powering mode, the mode of operation of battery 500 switched
Journey is as follows：
Such as Pgrid＞ Poutput(max), then DC-to-dc reversible transducer 203 judge photovoltaic generating system 100 supply photovoltaic
Electric energy Shortcomings, discharge mode is switched to by battery 500, and battery 500 is discharged according to the second electric energy allocative decision
Electric energy carries out voltage increase through direct current through DC-to-dc reversible transducer 203, after being converted to alternating current through inverter and online
Electricity；
Wherein, the power output of battery 500 can be calculated by the second battery 500 electric discharge formula and obtained, second storage
The electric discharge formula of battery 500 is expressed as follows：Pbatteryoutput=Pgrid-Poutput(max)；
PbatteryoutputRepresent that battery 500 discharges the power output of electric energy in discharge mode；
Poutput(max)Represent that photovoltaic generating system 100 provides the peak power output of photovoltaic electric energy；
PgridRepresent when electric energy distribution control device 200 works in grid-connected powering mode and online electricity Part III photovoltaic
The power output of electric energy.
Such as Pgrid＜ Poutput(max), then DC-to-dc reversible transducer 203 judge photovoltaic generating system 100 output photovoltaic
Electric energy, which exists, is had more than needed, and battery 500 is switched into charge mode, is stored up after carrying out decompression processing to the photovoltaic electric energy more than needed
It is stored in battery 500；
The power output of the photovoltaic electric energy more than needed can be calculated by the charge formula of the second battery 500 and obtained, and this second
The charge formula of battery 500 is expressed as follows：Psuplus=Poutput(max)-Pgrid；
PsuplusRepresent the power output of the photovoltaic electric energy more than needed.
Based on the photovoltaic electric energy management method disclosed in Fig. 1 to Fig. 3, the present invention also proposes a kind of intelligentized photovoltaic electric energy
Management system.
As shown in figure 4, the photovoltaic electric energy management system includes photovoltaic generating system 100,300/ power transmission network 400 of load, stored
Battery 500 and one end connection photovoltaic generating system 100, other end connection 300/ power transmission network 400 of load and battery 500
Electric energy distributes control device 200.Electric energy distribution control device 200 is used for the photovoltaic electric for obtaining the offer of photovoltaic generating system 100
Can, powering mode is presently in based on it and determines rational electric energy allocative decision, is supplied according to electricity on power transmission network 400 or load 300
Electric demand, performs corresponding electric energy between battery 500, power transmission network 400 or load 300 using the electric energy allocative decision and distributes
Work.
Fig. 5 shows the structured flowchart of a specific embodiment of electric energy distribution control device 200 in Fig. 4.Such as Fig. 5 institutes
Show, electric energy distribution control device 200 includes：
The anti-reversing clutch 201 of dc bus is connected to, for preventing the input current of photovoltaic generating system 100 from producing adverse current；
Two-way inverter 202, during for judging that electric energy distribution control device 200 works in off-network powering mode, will be based on
The Part I photovoltaic electric energy that first electric energy allocative decision is assigned to is converted to for load 300 after alternating current, and for sentencing
When power-off can distribute control device 200 in grid-connected powering mode, by the 4th be assigned to based on the second electric energy allocative decision
Light splitting volt electric energy is converted to grid-connected after alternating current；
DC-to-dc reversible transducer 203, for judging that electric energy distribution control device 200 works in off-network powering mode
And battery 500 is when being in charge mode, the Part II photovoltaic electric energy being assigned to based on the first electric energy allocative decision is carried out
Battery 500 is stored in after decompression processing；
And for judging that electric energy distribution control device 200 works in off-network powering mode and battery 500 is in electric discharge
During pattern, the electric energy of battery 500 discharged based on the second electric energy allocative decision is subjected to boosting processing, and through two-way inverter
202 are converted to after alternating current for load 300.
First MPPT controller built in the DC-to-dc reversible transducer 203, second built in the two-way inverter 202
MPPT controller, first MPPT controller and second MPPT controller are used to the input current of photovoltaic generating system 100
Real-time sampling is carried out, the current peak power output of photovoltaic generating system 100 is calculated, it is current maximum according to photovoltaic generating system 100
Power output carries out dynamic regulation to DC bus-bar voltage, it is to avoid overvoltage causes electric energy to distribute the internal component of control device 200
Damage.
In the present invention, anti-reversing clutch 201 can be the one way conducting devices such as diode, or mechanically or electrically sub switch
Device.
Photovoltaic electric energy management method of the present invention and system and the advantage of electric energy distribution control device 200 embody as follows：
1st, photovoltaic electric energy management system of the present invention can be according to 300 power demands of electricity on power transmission network 400 or load, with reference to electric energy
Distribution control device 200 residing for powering mode by photovoltaic generating system 100 input photovoltaic electric energy battery 500, load 300 or
Reasonable distribution is carried out between power transmission network 400, customer power supply demand has both been met, the waste of photovoltaic electric energy more than needed is turn avoid, saved
About fuel source, improve can photovoltaic electric energy utilization rate.
2nd, electric energy distribution control device 200 can pass through 202 pairs of light of DC-to-dc reversible transducer 203 or two-way inverter
The input current of photovoltaic generating system 100 carries out real-time sampling, the current peak power output of photovoltaic generating system 100 is calculated, according to light
The current peak power output of photovoltaic generating system 100 carries out dynamic regulation to DC bus-bar voltage, realizes to busbar voltage voltage stabilizing control
System, it is to avoid overvoltage causes electric energy to distribute the damage of control device 200 internal component.
3rd, electric energy distribution control device 200 of the present invention is provided with automatic protection mechanism.As electric energy distributes the basis of control device 200
The input current sampled result of photovoltaic generating system 100 judges that photovoltaic generating system 100 works in Night, then by direct current-
Direct current reversible transducer 203 or two-way inverter 202 accordingly turn down DC bus-bar voltage, while starting anti-reversing clutch 201, prevent
Bus high pressure pours into photovoltaic battery panel；Sampled and tied according to the input current of photovoltaic generating system 100 such as electric energy distribution control device 200
Fruit judge the power output of photovoltaic generating system 100 beyond load 300 and battery 500 rated power sum, then by direct current-
Accordingly rise DC bus-bar voltage, to deviate the operation of MPPT points, is prevented to storing for direct current reversible transducer 203 or two-way inverter 202
Battery 500 is overcharged or DC-to-dc reversible transducer 203 overloads.
One of ordinary skill in the art will appreciate that realize all or part of flow in above-described embodiment method, being can be with
The hardware of correlation is instructed to complete by computer program, described program can be stored in a computer readable storage media
In, the program is upon execution, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, described storage medium can be magnetic
Dish, CD, read-only storing memory body (Read Only Memory, ROM) or random storing memory body (Random ABBess
Memory, RAM) etc..
Embodiments of the invention are described above in conjunction with accompanying drawing, but the invention is not limited in above-mentioned specific
Embodiment, above-mentioned embodiment is only schematical, rather than restricted, one of ordinary skill in the art
Under the enlightenment of the present invention, in the case of present inventive concept and scope of the claimed protection is not departed from, it can also make a lot
Form, these are belonged within the protection of the present invention.
Claims (6)
1. a kind of photovoltaic electric energy management method, it is characterised in that it is used in photovoltaic electric energy management system, photovoltaic electric energy management system
System includes photovoltaic generating system, load and power transmission network, battery and one end connection photovoltaic generating system, and other end connection is negative
Carry and the electric energy of power transmission network and battery distributes control device；The electric energy distribution control device is used to get photovoltaic generation
During the photovoltaic electric energy of system input, powering mode is presently in based on it and determines matching electric energy allocative decision, according to defeated
Electricity or load supplying demand on power network, are performed corresponding using the electric energy allocative decision between battery, power transmission network or load
Electric energy shares out the work；
The electric energy distribution control device includes the anti-reversing clutch for being connected to dc bus, for preventing photovoltaic generating system from inputting
Electric current produces adverse current；Two-way inverter, will be based on the during for judging that electric energy distribution control device works in off-network powering mode
The Part I photovoltaic electric energy that one electric energy allocative decision is assigned to is converted to for load after alternating current, and for judging electric energy
When distributing control device in grid-connected powering mode, the Part IV photovoltaic electric energy that will be assigned to based on the second electric energy allocative decision
Be converted to grid-connected after alternating current；DC-to-dc reversible transducer, powers for judging that electric energy distribution control device works in off-network
When pattern and battery are in charge mode, the Part II photovoltaic electric energy being assigned to based on the first electric energy allocative decision is carried out
Battery is stored in after decompression processing, and for judging that electric energy distribution control device works in off-network powering mode and battery
During in discharge mode, the battery electric energy discharged based on the second electric energy allocative decision is subjected to boosting processing, and through two-way inverse
Become device to be converted to after alternating current for load；
Comprise the following steps：
S0, real-time sampling carried out to photovoltaic generating system input current by DC-to-dc reversible transducer or two-way inverter,
The current peak power output of photovoltaic generating system is calculated according to sampled result, according to the current peak power output of photovoltaic generating system
Dynamic regulation is carried out to DC bus-bar voltage, and the power output of system is all determined by two-way inverter, that is, it is defeated when being incorporated into the power networks
Go out the power output that power sets by two-way inverter and determine that power output is determined by the load of two-way inverter during off-grid operation
It is fixed；
DC-to-dc reversible transducer, for judging that electric energy distribution control device is worked at off-network powering mode and battery
When charge mode, the Part II photovoltaic electric energy being assigned to based on the first electric energy allocative decision is carried out to store after decompression processing
In battery；
S1, judge electric energy distribution control device be presently in powering mode；
S2, when getting the photovoltaic electric energy of photovoltaic generating system input, it is determined that currently being powered mould with electric energy distribution control device
The electric energy allocative decision that formula matches, according to electricity or load supplying demand on power transmission network, using the electric energy allocative decision in electric power storage
Corresponding electric energy is performed between pond, power transmission network or load to share out the work；The step S0 also includes following sub-step：
S01, such as judge that photovoltaic generating system works in Night according to photovoltaic generating system input current sampled result, then lead to
Cross DC-to-dc reversible transducer or two-way inverter accordingly turns down DC bus-bar voltage, and stability contorting dc bus electricity
Pressure, while starting anti-reversing clutch；
S02, such as according to photovoltaic generating system input current sampled result judge photovoltaic power generation system output power beyond load and
The rated power sum of battery, then accordingly raise dc bus electricity by DC-to-dc reversible transducer or two-way inverter
Pressure, is prevented to accumulator super-charge or DC-to-dc reversible transducer overload.
2. photovoltaic electric energy management method according to claim 1, it is characterised in that electric energy described in step S1 divides as described
Off-network powering mode is worked in control device, then the step S2 accordingly includes following sub-step：
S21, two-way inverter determine the first electric energy distribution side matched with off-network powering mode residing for electric energy distribution control device
Case, will be converted to after alternating current for load based on the Part I photovoltaic electric energy that the first electric energy allocative decision is assigned to；
S22, DC-to-dc reversible transducer carry out the Part II photovoltaic electric energy being assigned to based on the first electric energy allocative decision
Battery is stored in after decompression processing, or battery discharges the part electric energy of storage according to the first electric energy allocative decision, through straight
Stream-direct current reversible transducer carries out boosting processing, and for load after being converted to alternating current through two-way inverter；
Wherein, the first electric energy allocative decision is realized based on the first electric energy power distribution formula, the first electric energy power point
It is expressed as follows with formula：Poutput(max)=Pbattery+Pload；
Poutput(max)Represent that photovoltaic generating system provides the peak power output of photovoltaic electric energy；
PloadRepresent that electric energy distributes the Part I photovoltaic for distributing and being supplied in load when control device works in off-network powering mode
The power output of electric energy；
PbatteryRepresent that electric energy distributes the Part II for distributing and being stored in battery when control device works in off-network powering mode
Photovoltaic electric energy or battery discharge the power output of electric energy.
3. photovoltaic electric energy management method according to claim 2, it is characterised in that the step S22 also includes：
S221, such as Pload＞ Poutput(max), then judge that load supplying is not enough, is switched to discharge mode, by battery by battery
Electric energy is discharged according to the first electric energy allocative decision through DC-to-dc reversible transducer progress voltage increase, and through inverter to turn
It is changed to after alternating current for load；
Wherein, the power output of battery can be calculated by the first battery discharging formula and obtained, and first battery discharging is public
Formula is expressed as follows：Pbatteryoutput=Pload-Poutput(max)；
PbatteryoutputRepresent that battery discharges the power output of electric energy under discharge mode；
S222, such as Pload＜ Poutput(max), then judge that photovoltaic generating system output photovoltaic electric energy is present more than needed, battery switched
To charge mode, battery is stored in after the photovoltaic electric energy progress decompression processing more than needed to this of DC-to-dc reversible transducer；
The power output of the photovoltaic electric energy of the flap portion can be calculated by the first battery charge formula and obtained, first electric power storage
Pond charge formula is expressed as follows：Psuplus=Poutput(max)-Pload；
PsuplusRepresent the power output of the photovoltaic electric energy more than needed；
Poutput(max)Represent that photovoltaic generating system provides the peak power output of photovoltaic electric energy；
PloadRepresent that electric energy distributes the Part I photovoltaic for distributing and being supplied in load when control device works in off-network powering mode
The power output of electric energy.
4. photovoltaic electric energy management method according to claim 1, it is characterised in that electric energy described in step S1 divides as described
Grid-connected powering mode is worked in control device, then the step S2 accordingly includes following sub-step：
S21 ', DC-to-dc reversible transducer determine second matched with grid-connected powering mode residing for electric energy distribution control device
Electric energy allocative decision, the Part III photovoltaic electric energy being assigned to based on the second electric energy allocative decision is carried out to store after decompression processing
In battery；
S22 ', two-way inverter will be converted to alternating current based on the Part IV photovoltaic electric energy that the second electric energy allocative decision is assigned to
It is afterwards that its is grid-connected；
Wherein, the second electric energy allocative decision is realized based on the second electric energy power distribution formula, the second electric energy power distribution
Formula is expressed as follows：Poutput(max)=Pbattery+Pgrid；
Poutput(max)Represent that photovoltaic generating system provides the peak power output of photovoltaic electric energy；
PgridRepresent when electric energy distribution control device works in grid-connected powering mode and the Part III photovoltaic electric energy of online electricity it is defeated
Go out power；
PbatteryRepresent that electric energy distributes the Part IV photovoltaic electric that battery is stored in when control device works in grid-connected powering mode
Energy or battery discharge the power output of electric energy.
5. photovoltaic electric energy management method according to claim 4, it is characterised in that the step S22 ' also includes：
S221 ', such as Pgrid＞ Poutput(max), then judge photovoltaic generating system supply photovoltaic electric energy Shortcomings, battery cut
Discharge mode is changed to, the electric energy that battery discharges according to the second electric energy allocative decision is carried out through DC-to-dc reversible transducer
Voltage increase, and after being converted to alternating current through inverter and online electricity；Wherein, the power output of battery can store by second
Battery discharge formula is calculated and obtained, and the second battery discharging formula is expressed as follows：Pbatteryoutput=Pgrid-Poutput(max)；
PbatteryoutputRepresent that battery discharges the power output of electric energy in discharge mode；
Poutput(max)Represent that photovoltaic generating system provides the peak power output of photovoltaic electric energy；
PgridRepresent when electric energy distribution control device works in grid-connected powering mode and the Part III photovoltaic electric energy of online electricity it is defeated
Go out power；
S222 ', such as Pgrid＜ Poutput(max), then judge that photovoltaic generating system output photovoltaic electric energy is present more than needed, battery cut
Charge mode is changed to, is stored at after the photovoltaic electric energy progress decompression processing more than needed to this of DC-to-dc reversible transducer
Battery；
The power output of the photovoltaic electric energy more than needed can be calculated by the second battery charge formula and obtained, and second battery fills
Electric formula is expressed as follows：Psuplus=Poutput(max)-Pgrid；
PsuplusRepresent the power output of the photovoltaic electric energy more than needed.
6. a kind of electric energy applied to photovoltaic electric energy management method as claimed in claim 5 distributes control device, its feature exists
In electric energy distribution control device includes：
First MPPT controller built in DC-to-dc reversible transducer, the second MPPT controller built in two-way inverter, described
One MPPT controller and second MPPT controller are used to carry out real-time sampling to photovoltaic power generation system output power, calculate
The current peak power output of photovoltaic generating system, enters according to the current peak power output of photovoltaic generating system to DC bus-bar voltage
Mobile state is adjusted.
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| CN105119553B (en) * | 2015-09-09 | 2018-09-28 | 湖北中南鹏力海洋探测系统工程有限公司 | Modular power supply system based on solar panels Yu accumulation energy type accumulator |
| CN105244918A (en) * | 2015-11-12 | 2016-01-13 | 甘肃上航电力运维有限公司 | Photovoltaic energy storage power station |
| CN107332270B (en) * | 2016-04-29 | 2023-06-09 | 伊顿飞瑞慕品股份有限公司 | Energy management device for photovoltaic grid-connected power generation system |
| CN106329568B (en) * | 2016-08-31 | 2018-10-02 | 湖北大学 | Family quotient's type photovoltaic generation economic dispatch control system |
| CN106225254A (en) * | 2016-09-30 | 2016-12-14 | 王义东 | A kind of round-the-clock multipurpose photovoltaic stores hot systems and method |
| CN108418240B (en) * | 2017-02-10 | 2023-04-18 | 丰郅(上海)新能源科技有限公司 | Energy routing system and energy distribution method |
| WO2018213273A1 (en) | 2017-05-15 | 2018-11-22 | Dynapower Company Llc | Method and system for extracting excess power |
| EP3698448B1 (en) * | 2017-10-20 | 2022-07-20 | Cummins Power Generation Ltd. (UK) | Controller for a power generation system and operating method thereof |
| CN107979115B (en) * | 2017-12-18 | 2019-08-23 | 科华恒盛股份有限公司 | The maximum power point tracking method, apparatus and equipment of photovoltaic generating system |
| CN109995087B (en) * | 2017-12-29 | 2021-03-09 | 北京天诚同创电气有限公司 | Frequency modulation control method and device for power station and frequency modulation system |
| CN108964100B (en) * | 2018-06-26 | 2022-03-25 | 江门云天电力设计咨询有限公司 | Photovoltaic circuit control method and device based on circuit current |
| CN109347094B (en) * | 2018-10-24 | 2020-10-09 | 珠海格力电器股份有限公司 | Converter, method and device for distributing electric energy by converter and electric energy distribution system |
| CN111244952A (en) * | 2020-03-12 | 2020-06-05 | 珠海格力电器股份有限公司 | Composite power supply system and power supply regulation and control method thereof |
| CN112701755A (en) * | 2020-12-31 | 2021-04-23 | 北京意科瑞思能源技术有限公司 | Off-grid photovoltaic system and residual generating power utilization method thereof |
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| CN102427266B (en) * | 2012-01-04 | 2014-03-19 | 广东易事特电源股份有限公司 | Multifunctional photovoltaic UPS (uninterruptible power supply) system and control method thereof |
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