CN104795832A - Photovoltaic power management method, photovoltaic power management system and power distribution control device - Google Patents
Photovoltaic power management method, photovoltaic power management system and power distribution control device Download PDFInfo
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- CN104795832A CN104795832A CN201510202210.3A CN201510202210A CN104795832A CN 104795832 A CN104795832 A CN 104795832A CN 201510202210 A CN201510202210 A CN 201510202210A CN 104795832 A CN104795832 A CN 104795832A
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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 photovoltaic power management method, a photovoltaic power management system and a power distribution control device. The photovoltaic power management system comprises a photovoltaic power generation system, a power transmission network, a load, a storage battery and the power distribution control device, wherein one end of the power distribution control device is connected with the photovoltaic power generation system, and the other end of the power distribution control device is connected with the power transmission network, the load and the storage battery. The power distribution control device is used for determining a power distribution scheme matched with a current power supply mode on the basis of the current power supply mode when photovoltaic power inputted by the photovoltaic power generation system is acquired and applying the power distribution scheme to execute corresponding power distribution operations between the storage battery and the power transmission network or the load according to electrification requirements of the power transmission network or power supply requirements of the load. By the photovoltaic power management system, reasonable distribution of photovoltaic power between the storage battery and the load or the power transmission network can be realized according to the current power supply mode and the electrification requirements of the power transmission network or the power supply requirements of the load, and accordingly power supply requirements of users can be met while waste of surplus photovoltaic power is avoided, and photovoltaic power utilization rate is increased.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, more particularly, relate to a kind of photovoltaic electric energy management method and system and power distribution control device.
Background technology
In recent years, new forms of energy photovoltaic generation is widely applied, and energy-storage system is by power storage unnecessary for photovoltaic generation in the energy-storage units such as battery, and when the low light level, the electric energy discharged in energy-storage units is load or mains supply, realize the energy to stabilize, to use sky sun energy more reposefully.
At present, the scheme that photovoltaic generation and energy storing and electricity generating use jointly has AC to be coupled to be coupled with DC side two kinds of modes, and wherein, AC coupled modes interchanger energy loss is comparatively large, and the loss of DC side coupling energy is less.But the mode that DC side is coupled normally photovoltaic generating system and battery is all merged together by DC-DC converter, then connects inverter, this system architecture also exists the problem that energy pathway is comparatively far away and energy loss is larger.
Summary of the invention
The technical problem to be solved in the present invention is the above-mentioned defect for prior art, provides a kind of photovoltaic electric energy management method and system and power distribution control device.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of photovoltaic electric energy management method, comprise the steps:
S1, judge the current residing powering mode of power distribution control device;
S2, get photovoltaic generating system input photovoltaic electric energy time, determine and the power distribution scheme that the current powering mode of power distribution control device matches, power on according to power transmission network or load supplying demand, apply this power distribution scheme between storage battery, power transmission network or load, perform corresponding power distribution work.
State in photovoltaic electric energy management method on the invention, described method also comprised the steps: before described step S1
S0, by DC-to-DC reversible transducer or two-way inverter, real-time sampling is carried out to photovoltaic generating system input current, calculate the current peak power output of photovoltaic generating system according to sampled result, according to photovoltaic generating system current peak power output, dynamic adjustments is carried out to DC bus-bar voltage.
State in photovoltaic electric energy management method on the invention, as described in power distribution control device described in step S1 work in from net powering mode, then described step S2 is corresponding comprises following sub-step:
S21, two-way inverter determine with residing for power distribution control device from the first power distribution scheme that net powering mode mates, the Part I photovoltaic electric energy be assigned to based on the first power distribution scheme is converted to after alternating current for load;
S22, DC-to-DC reversible transducer are stored in storage battery after the Part II photovoltaic electric energy be assigned to based on the first power distribution scheme is carried out step-down process, or the part electric energy that storage battery stores according to the first power distribution scheme release, carry out boosting process through DC-to-DC reversible transducer, and be converted to after alternating current for load through two-way inverter;
Wherein, described first power distribution scheme realizes based on the first electric energy power division formula, and described first electric energy power division formula is expressed as follows: P
output (max)=P
battery+ P
load;
P
output (max)represent photovoltaic generating system the peak power output of photovoltaic electric energy is provided;
P
loadrepresent that power distribution control device works in the power output of Part I photovoltaic electric energy from distributing and be supplied in load during net powering mode;
P
batteryrepresent that power distribution control device works in from distributing during net powering mode and being stored in the Part II photovoltaic electric energy of storage battery or the power output of storage battery release electric energy.
State in photovoltaic electric energy management method on the invention, described step S22 also comprises:
S221, as P
load> P
output (max), then judge that load supplying is not enough, is switched to discharge mode by storage battery, storage battery carried out voltage lifting through direct current through DC-to-DC reversible transducer according to the first power distribution scheme release electric energy, and is converted to after alternating current for load through inverter;
Wherein, the power output of storage battery obtains by the first battery discharging formulae discovery, and this first battery discharging formula is expressed as follows: P
batteryoutput=P
load-P
output (max);
P
batteryoutputrepresent that storage battery discharges the power output of electric energy under discharge mode;
S222, as P
load< P
output (max), then judge that photovoltaic generating system exports photovoltaic electric energy and exists more than needed, storage battery be switched to charge mode, after step-down process being carried out to this photovoltaic electric energy more than needed by DC-to-DC reversible transducer, be stored in storage battery;
The power output of the photovoltaic electric energy of this flap portion obtains by the first charge in batteries formulae discovery, and this first charge in batteries formula is expressed as follows: P
suplus=P
output (max)-P
load;
P
suplusrepresent the power output of this photovoltaic electric energy more than needed;
P
output (max)represent photovoltaic generating system the peak power output of photovoltaic electric energy is provided;
P
loadrepresent that power distribution control device works in the power output of Part I photovoltaic electric energy from distributing and be supplied in load during net powering mode.
State in photovoltaic electric energy management method on the invention, as described in power distribution control device described in step S1 work in grid-connected powering mode, then described step S2 is corresponding comprises following sub-step:
The second power distribution scheme of mating with grid-connected powering mode residing for power distribution control device determined by S21 ', DC-to-DC reversible transducer, is stored in storage battery after the Part III photovoltaic electric energy be assigned to is carried out step-down process based on the second power distribution scheme;
S22 ', two-way inverter are grid-connected by it after the Part IV photovoltaic electric energy be assigned to based on the second power distribution scheme is converted to alternating current;
Wherein, described second power distribution scheme realizes based on the second electric energy power division formula, and this second electric energy power division formula is expressed as follows: P
output (max)=P
battery+ P
grid;
P
output (max)represent photovoltaic generating system the peak power output of photovoltaic electric energy is provided;
P
gridthe power output of the grid-connected Part III photovoltaic electric energy powered on when representing that power distribution control device works in grid-connected powering mode;
P
batteryrepresent that power distribution control device is stored in the Part IV photovoltaic electric energy of storage battery or the power output of storage battery release electric energy when working in grid-connected powering mode.
State in photovoltaic electric energy management method on the invention, described step S22 ' also comprises:
S221 ', as P
grid> P
output (max)then judge photovoltaic generating system supply photovoltaic electric energy Shortcomings, storage battery is switched to discharge mode, the electric energy that storage battery discharges according to the second power distribution scheme is carried out voltage lifting through direct current through DC-to-DC reversible transducer, and be converted to grid-connected after alternating current powering on through inverter;
Wherein, the power output of storage battery obtains by the second battery discharging formulae discovery, and this second battery discharging formula is expressed as follows: P
batteryoutput=P
grid-P
output (max);
P
batteryoutputrepresent the power output of storage battery at discharge mode release electric energy;
P
output (max)represent photovoltaic generating system the peak power output of photovoltaic electric energy is provided;
P
gridthe power output of the grid-connected Part III photovoltaic electric energy powered on when representing that power distribution control device works in grid-connected powering mode;
S222 ', as P
grid< P
output (max), then judge that photovoltaic generating system exports photovoltaic electric energy and exists more than needed, storage battery be switched to charge mode, after step-down process being carried out to this photovoltaic electric energy more than needed by DC-to-DC reversible transducer, be stored in storage battery;
The power output of this photovoltaic electric energy more than needed obtains by the second charge in batteries formulae discovery, and this second charge in batteries formula is expressed as follows: P
suplus=P
output (max)-P
grid;
P
suplusrepresent the power output of this photovoltaic electric energy more than needed.
State in photovoltaic electric energy management method on the invention, described step S0 also comprises following sub-step:
S01, as judged that photovoltaic generating system works in Night according to photovoltaic generating system input current sampled result, then by DC-to-DC reversible transducer or two-way inverter is corresponding turns down DC bus-bar voltage, start anti-reversing clutch simultaneously;
S02, as judged that photovoltaic power generation system output power exceeds the rated power sum of load and storage battery according to photovoltaic generating system input current sampled result, then by DC-to-DC reversible transducer or the corresponding rising DC bus-bar voltage of two-way inverter.
The present invention also constructs a kind of photovoltaic electric energy management system, comprises photovoltaic generating system, power transmission network and load, storage battery, and also comprise one end and connect photovoltaic generating system, the other end connects the power distribution control device of power transmission network and load and storage battery:
Described power distribution control device for get photovoltaic generating system input photovoltaic electric energy time, the power distribution scheme matched is determined based on its current residing powering mode, power on according to power transmission network or load supplying demand, apply this power distribution scheme between storage battery, power transmission network or load, perform corresponding power distribution work.
The present invention also constructs a kind of power distribution control device being applied to photovoltaic electric energy management system, and described power distribution control device comprises:
Being connected to the anti-reversing clutch of DC bus, producing adverse current for preventing photovoltaic generating system input current;
Two-way inverter, during for judging that power distribution control device works in from net powering mode, the Part I photovoltaic electric energy be assigned to based on the first power distribution scheme is converted to after alternating current for load, and during for judging that power distribution control device is in grid-connected powering mode, grid-connected after the Part IV photovoltaic electric energy be assigned to based on the second power distribution scheme is converted to alternating current;
DC-to-DC reversible transducer, for judge that power distribution control device works in from net powering mode and storage battery is in charge mode time, be stored in storage battery after the Part II photovoltaic electric energy be assigned to based on the first power distribution scheme is carried out step-down process;
And for judge that power distribution control device works in from net powering mode and storage battery is in discharge mode time, the storage battery electric energy based on the second power distribution scheme release is carried out boosting and processes, and be converted to after alternating current for load through two-way inverter.
State in power distribution control device on the invention, built-in first MPPT controller of described DC-to-DC reversible transducer, built-in second MPPT controller of described two-way inverter, described first MPPT controller and described second MPPT controller are all for carrying out real-time sampling to photovoltaic power generation system output power, calculate the current peak power output of photovoltaic generating system, according to photovoltaic generating system current peak power output, dynamic adjustments is carried out to DC bus-bar voltage.
Implement photovoltaic electric energy management method of the present invention and system and power distribution control device, following beneficial effect can be reached:
1, photovoltaic electric energy management system of the present invention can power on according to power transmission network or load supplying demand, the photovoltaic electric energy inputted by photovoltaic generating system in conjunction with powering mode residing for power distribution control device carries out reasonable distribution between storage battery, load or power transmission network, both customer power supply demand had been met, turn avoid the waste of photovoltaic electric energy more than needed, save fuel source, improve the utilance of photovoltaic electric energy.
2, power distribution control device carries out real-time sampling by DC-to-DC reversible transducer or two-way inverter to photovoltaic generating system input current, calculate the current peak power output of photovoltaic generating system, according to photovoltaic generating system current peak power output, dynamic adjustments is carried out to DC bus-bar voltage, realize controlling busbar voltage voltage stabilizing, avoid the damage that overvoltage causes power distribution control device internal component.
3, power distribution control device of the present invention is provided with automatic protection mechanism.As according to photovoltaic generating system input current sampled result, power distribution control device judges that photovoltaic generating system works in Night, then by DC-to-DC reversible transducer or two-way inverter is corresponding turns down DC bus-bar voltage, start anti-reversing clutch simultaneously, prevent bus high pressure from pouring into photovoltaic battery panel; As according to photovoltaic generating system input current sampled result, power distribution control device judges that photovoltaic power generation system output power exceeds the rated power sum of load and storage battery, then run to depart from MPPT point by DC-to-DC reversible transducer or the corresponding rising DC bus-bar voltage of two-way inverter, prevent accumulator super-charge or DC-to-DC reversible transducer overload.
Accompanying drawing explanation
Fig. 1 is the flow chart of a specific embodiment of photovoltaic electric energy management method provided by the invention;
The method flow diagram of first power distribution scheme of Fig. 2 for relating in the photovoltaic electric energy management method shown in Fig. 1;
The method flow diagram of second power distribution scheme of Fig. 3 for relating in the photovoltaic electric energy management method shown in Fig. 1;
Fig. 4 is the structured flowchart of a specific embodiment of photovoltaic electric energy management system provided by the invention;
Fig. 5 is the structured flowchart of the power distribution control device of the photovoltaic electric energy management system shown in Fig. 4.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The present invention proposes a kind of photovoltaic electric energy management method, the method can to power on or load 300 power supply needs to export photovoltaic electric energy to photovoltaic generating system 100 and carries out reasonable distribution according to grid-connected, improve the utilance of photovoltaic electric energy, save fuel source, energy-saving and emission-reduction have been served 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, this photovoltaic electric energy management method comprises the steps:
First in step S101, power distribution control device 200 pairs of photovoltaic generating system 100 input currents carry out real-time sampling, calculate the current peak power output of photovoltaic generating system 100, according to photovoltaic generating system 100 current peak power output, dynamic adjustments is carried out to DC bus-bar voltage, realize controlling busbar voltage voltage stabilizing.
As according to photovoltaic generating system 100 input current sampled result, power distribution control device 200 judges that photovoltaic generating system 100 works in Night, then by DC-to-DC reversible transducer 203 or two-way inverter 202 is corresponding turns down DC bus-bar voltage, start anti-reversing clutch 201 simultaneously, prevent bus high pressure from pouring into photovoltaic battery panel.
As according to photovoltaic generating system 100 input current sampled result, power distribution control device 200 judges that photovoltaic generating system 100 power output exceeds the rated power sum of load 300 and storage battery 500, then run to depart from MPPT point by DC-to-DC reversible transducer 203 or the corresponding rising DC bus-bar voltage of two-way inverter 202, prevent from overcharging storage battery 500 or DC-to-DC reversible transducer 203 transships.
In later step S102, judge the current residing powering mode of power distribution control device 200.
In later step S1031, power distribution control device 200 works in from net powering mode, performs step S1041 after step S1031.
Or in step S1032, power distribution control device 200 works in grid-connected powering mode, performs step S1042 after step S1032.
In later step S1041, first power distribution scheme of from net powering mode mating residing with power distribution control device 200 determined by DC-to-DC reversible transducer 203, according to load 300 need for electricity, between storage battery 500 and load 300, perform corresponding power distribution work according to the first power distribution scheme.
Or in step S1042, the second power distribution scheme of mating with grid-connected powering mode residing for power distribution control device 200 determined by two-way inverter 202, to power on demand according to power transmission network 400, between storage battery 500 and power transmission network 400, perform corresponding power distribution work according to the second power distribution scheme.
Fig. 2 shows the method flow diagram of the specific embodiment from the first power distribution scheme under net powering mode that step S104 in Fig. 1 discloses, and as shown in Figure 2, this step S104 comprises following sub-step further:
First in step S10411, first power distribution scheme of from net powering mode mating residing with power distribution control device 200 determined by two-way inverter 202, the Part I photovoltaic electric energy be assigned to is converted to supply load 300 after alternating current based on the first power distribution scheme.
In the present invention, above-mentioned first power distribution scheme realizes based on the first electric energy power division formula, and this first electric energy power division formula is expressed as follows: P
output (max)=P
battery+ P
load;
P
output (max)represent photovoltaic generating system 100 the peak power output of photovoltaic electric energy is provided;
P
loadrepresent that power distribution control device 200 works in the power output from the Part I photovoltaic electric energy being supplied in load 300 during net powering mode;
P
batteryrepresent that power distribution control device 200 works in the power output discharging electric energy from the Part II photovoltaic electric energy or storage battery 500 that are stored in storage battery 500 during net powering mode.
In later step S10412, DC-to-DC reversible transducer 203 according to the first power distribution scheme, and switches mode of operation residing for storage battery 500 in conjunction with the current peak power output of photovoltaic generating system 100 and the grid-connected demand that powers on of power transmission network 400.
When power distribution control device 200 of the present invention is in from net powering mode, storage battery 500 work-mode switching process is as follows:
As P
load> P
output (max)then judge load 300 electricity shortage, storage battery 500 is switched to discharge mode, storage battery 500 is carried out voltage lifting through direct current through DC-to-DC reversible transducer 203 according to the first power distribution scheme release electric energy, and is converted to after alternating current for load 300 through inverter;
Wherein, the power output that storage battery 500 discharges electric energy obtains by the first battery discharging formulae discovery, and this storage battery 500 formula that discharges is expressed as follows: P
batteryoutput=P
load-P
output (max);
P
batteryoutputrepresent that storage battery 500 discharges the power output of electric energy under discharge mode.
As P
load< P
output (max), then judge that photovoltaic generating system 100 exports photovoltaic electric energy and exists more than needed, storage battery 500 be switched to charge mode, after step-down process being carried out to this photovoltaic electric energy more than needed by DC-to-DC reversible transducer 203, be stored in storage battery 500;
The power output of the photovoltaic electric energy of this flap portion obtains by the first charge in batteries formulae discovery, and this first charge in batteries formula is expressed as follows: P
suplus=P
output (max)-P
load;
P
suplusrepresent the power output of this photovoltaic electric energy more than needed;
P
output (max)represent photovoltaic generating system 100 the peak power output of photovoltaic electric energy is provided;
P
loadrepresent that power distribution control device 200 works in the power output of Part I photovoltaic electric energy from distributing and be supplied in load 300 during net powering mode.
In later step S10413, storage battery 500 is switched to charge mode according to the current peak power output of photovoltaic generating system 100 and load 300 power demands by DC-to-DC reversible transducer 203.
In later step S10414, DC-to-DC reversible transducer 203 is stored in storage battery 500 after the Part II photovoltaic electric energy distributed based on the first power distribution scheme is carried out step-down process.
Or in step S10415, storage battery 500 is switched to discharge mode by DC-to-DC reversible transducer 203, storage battery 500 is according to the first power distribution scheme release portion electric energy, DC-to-DC reversible transducer 203 carries out boosting process to this part electric energy, is converted to after alternating current for load 300 through two-way inverter 202.
Fig. 3 shows the method flow diagram of a specific embodiment of the second power distribution scheme that step S1042 in Fig. 1 of the present invention discloses.As shown in Figure 3, this step S1042 specifically comprises following sub-step:
First in step S10421, the second power distribution scheme of mating with grid-connected powering mode residing for power distribution control device 200 determined by DC-to-DC reversible transducer 203, and the Part II photovoltaic electric energy be assigned to based on the second power distribution scheme is converted to after alternating current for load 300 by two-way inverter 202.
In the present invention, this second power distribution scheme realizes based on the second electric energy power division formula, and this second electric energy power division formula is expressed as follows: P
output (max)=P
battery+ P
grid; Wherein:
P
output (max)represent photovoltaic generating system 100 the peak power output of photovoltaic electric energy is provided;
P
gridthe power output of the grid-connected Part III photovoltaic electric energy powered on when representing that power distribution control device 200 works in grid-connected powering mode;
P
batteryrepresent that power distribution control device 200 distributes when working in grid-connected powering mode and is stored in the power output that the Part IV photovoltaic electric energy of storage battery 500 or storage battery 500 discharge electric energy.
In later step S10422, DC-to-DC reversible transducer 203 according to the second power distribution scheme, and switches mode of operation residing for storage battery 500 in conjunction with the current peak power output of photovoltaic generating system 100 and the grid-connected demand that powers on of power transmission network 400.
When power distribution control device 200 of the present invention is in grid-connected powering mode, storage battery 500 work-mode switching process is as follows:
As P
grid> P
output (max)then DC-to-DC reversible transducer 203 judges that photovoltaic generating system 100 supplies photovoltaic electric energy Shortcomings, storage battery 500 is switched to discharge mode, the electric energy that storage battery 500 discharges according to the second power distribution scheme is carried out voltage lifting through direct current through DC-to-DC reversible transducer 203, is converted to grid-connected after alternating current powering on through inverter;
Wherein, the power output of storage battery 500 obtains by the second storage battery 500 formulae discovery that discharges, and this second storage battery 500 formula that discharges is expressed as follows: P
batteryoutput=P
grid-P
output (max);
P
batteryoutputrepresent the power output of storage battery 500 at discharge mode release electric energy;
P
output (max)represent photovoltaic generating system 100 the peak power output of photovoltaic electric energy is provided;
P
gridthe power output of the grid-connected Part III photovoltaic electric energy powered on when representing that power distribution control device 200 works in grid-connected powering mode.
As P
grid< P
output (max), then DC-to-DC reversible transducer 203 judges that photovoltaic generating system 100 exports photovoltaic electric energy and exists more than needed, storage battery 500 is switched to charge mode, is stored in storage battery 500 after carrying out step-down process to this photovoltaic electric energy more than needed;
The power output of this photovoltaic electric energy more than needed calculates by the second storage battery 500 charge formula, and this second storage battery 500 charge formula is expressed as follows: P
suplus=P
output (max)-P
grid;
P
suplusrepresent the power output of this photovoltaic electric energy more than needed.
Based on the photovoltaic electric energy management method that Fig. 1 to Fig. 3 discloses, the present invention also proposes a kind of intelligentized photovoltaic electric energy management system.
As shown in Figure 4, this photovoltaic electric energy management system comprises photovoltaic generating system 100, load 300/ power transmission network 400, storage battery 500 and one end and connects photovoltaic generating system 100, and the other end connects the power distribution control device 200 of load 300/ power transmission network 400 and storage battery 500.The photovoltaic electric energy that this power distribution control device 200 provides for obtaining photovoltaic generating system 100, rational power distribution scheme is determined based on its current residing powering mode, power on according to power transmission network 400 or load 300 power demands, apply this power distribution scheme and perform corresponding power distribution work between storage battery 500, power transmission network 400 or load 300.
Fig. 5 shows the structured flowchart of a specific embodiment of power distribution control device 200 in Fig. 4.As shown in Figure 5, this power distribution control device 200 comprises:
Being connected to the anti-reversing clutch 201 of DC bus, producing adverse current for preventing photovoltaic generating system 100 input current;
Two-way inverter 202, during for judging that power distribution control device 200 works in from net powering mode, the Part I photovoltaic electric energy be assigned to based on the first power distribution scheme is converted to after alternating current for load 300, and during for judging that power distribution control device 200 is in grid-connected powering mode, grid-connected after the Part IV photovoltaic electric energy be assigned to based on the second power distribution scheme is converted to alternating current;
DC-to-DC reversible transducer 203, for judge that power distribution control device 200 works in from net powering mode and storage battery 500 is in charge mode time, be stored in storage battery 500 after the Part II photovoltaic electric energy be assigned to based on the first power distribution scheme is carried out step-down process;
And for judge that power distribution control device 200 works in from net powering mode and storage battery 500 is in discharge mode time, storage battery 500 electric energy based on the second power distribution scheme release is carried out boosting process, and is converted to after alternating current for load 300 through two-way inverter 202.
Built-in first MPPT controller of this DC-to-DC reversible transducer 203, built-in second MPPT controller of this two-way inverter 202, this first MPPT controller and this second MPPT controller are all for carrying out real-time sampling to photovoltaic generating system 100 input current, calculate the current peak power output of photovoltaic generating system 100, according to photovoltaic generating system 100 current peak power output, dynamic adjustments is carried out to DC bus-bar voltage, avoid overvoltage to cause the damage of power distribution control device 200 internal component.
In the present invention, anti-reversing clutch 201 can be the one way conducting devices such as diode, or mechanical or electronic switching device.
The advantage applies of photovoltaic electric energy management method of the present invention and system and power distribution control device 200 is as follows:
1, photovoltaic electric energy management system of the present invention can power on according to power transmission network 400 or load 300 power demands, in conjunction with powering mode residing for power distribution control device 200, photovoltaic generating system 100 is inputted photovoltaic electric energy and carry out reasonable distribution between storage battery 500, load 300 or power transmission network 400, both customer power supply demand had been met, turn avoid the waste of photovoltaic electric energy more than needed, saved fuel source, improve can the utilance of photovoltaic electric energy.
2, power distribution control device 200 carries out real-time sampling by DC-to-DC reversible transducer 203 or two-way inverter 202 pairs of photovoltaic generating system 100 input currents, calculate the current peak power output of photovoltaic generating system 100, according to photovoltaic generating system 100 current peak power output, dynamic adjustments is carried out to DC bus-bar voltage, realize controlling busbar voltage voltage stabilizing, avoid the damage that overvoltage causes power distribution control device 200 internal component.
3, power distribution control device 200 of the present invention is provided with automatic protection mechanism.As according to photovoltaic generating system 100 input current sampled result, power distribution control device 200 judges that photovoltaic generating system 100 works in Night, then by DC-to-DC reversible transducer 203 or two-way inverter 202 is corresponding turns down DC bus-bar voltage, start anti-reversing clutch 201 simultaneously, prevent bus high pressure from pouring into photovoltaic battery panel; As according to photovoltaic generating system 100 input current sampled result, power distribution control device 200 judges that photovoltaic generating system 100 power output exceeds the rated power sum of load 300 and storage battery 500, then run to depart from MPPT point by DC-to-DC reversible transducer 203 or the corresponding rising DC bus-bar voltage of two-way inverter 202, prevent from overcharging storage battery 500 or DC-to-DC reversible transducer 203 transships.
One of ordinary skill in the art will appreciate that all or part of flow process realized in above-described embodiment method, that the hardware that can carry out instruction relevant by computer program has come, described program can be stored in a computer readable storage media, this program, when performing, can comprise the flow process of the embodiment as above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only storing memory body (Read OnlyMemory, ROM) or random storing memory body (Random ABBess Memory, RAM) etc.
By reference to the accompanying drawings embodiments of the invention are described above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that present inventive concept and claim protect, also can make a lot of form, these all belong within protection of the present invention.
Claims (10)
1. a photovoltaic electric energy management method, is characterized in that, comprises the steps:
S1, judge the current residing powering mode of power distribution control device;
S2, get photovoltaic generating system input photovoltaic electric energy time, determine and the power distribution scheme that the current powering mode of power distribution control device matches, power on according to power transmission network or load supplying demand, apply this power distribution scheme between storage battery, power transmission network or load, perform corresponding power distribution work.
2. photovoltaic electric energy management method according to claim 1, is characterized in that, described method also comprised the steps: before described step S1
S0, by DC-to-DC reversible transducer or two-way inverter, real-time sampling is carried out to photovoltaic generating system input current, calculate the current peak power output of photovoltaic generating system according to sampled result, according to photovoltaic generating system current peak power output, dynamic adjustments is carried out to DC bus-bar voltage.
3. photovoltaic electric energy management method according to claim 1, is characterized in that, as described in power distribution control device described in step S1 work in from net powering mode, then described step S2 is corresponding comprises following sub-step:
S21, two-way inverter determine with residing for power distribution control device from the first power distribution scheme that net powering mode mates, the Part I photovoltaic electric energy be assigned to based on the first power distribution scheme is converted to after alternating current for load;
S22, DC-to-DC reversible transducer are stored in storage battery after the Part II photovoltaic electric energy be assigned to based on the first power distribution scheme is carried out step-down process, or the part electric energy that storage battery stores according to the first power distribution scheme release, carry out boosting process through DC-to-DC reversible transducer, and be converted to after alternating current for load through two-way inverter;
Wherein, described first power distribution scheme realizes based on the first electric energy power division formula, and described first electric energy power division formula is expressed as follows: P
output (max)=P
battery+ P
load;
P
output (max)represent photovoltaic generating system the peak power output of photovoltaic electric energy is provided;
P
loadrepresent that power distribution control device works in the power output of Part I photovoltaic electric energy from distributing and be supplied in load during net powering mode;
P
batteryrepresent that power distribution control device works in from distributing during net powering mode and being stored in the Part II photovoltaic electric energy of storage battery or the power output of storage battery release electric energy.
4. photovoltaic electric energy management method according to claim 3, is characterized in that, described step S22 also comprises:
S221, as P
load> P
output (max), then judge that load supplying is not enough, is switched to discharge mode by storage battery, storage battery carried out voltage lifting through direct current through DC-to-DC reversible transducer according to the first power distribution scheme release electric energy, and is converted to after alternating current for load through inverter;
Wherein, the power output of storage battery obtains by the first battery discharging formulae discovery, and this first battery discharging formula is expressed as follows: P
batteryoutput=P
load-P
output (max);
P
batteryoutputrepresent that storage battery discharges the power output of electric energy under discharge mode;
S222, as P
load< P
output (max), then judge that photovoltaic generating system exports photovoltaic electric energy and exists more than needed, storage battery be switched to charge mode, after step-down process being carried out to this photovoltaic electric energy more than needed by DC-to-DC reversible transducer, be stored in storage battery;
The power output of the photovoltaic electric energy of this flap portion obtains by the first charge in batteries formulae discovery, and this first charge in batteries formula is expressed as follows: P
suplus=P
output (max)-P
load;
P
suplusrepresent the power output of this photovoltaic electric energy more than needed;
P
output (max)represent photovoltaic generating system the peak power output of photovoltaic electric energy is provided;
P
loadrepresent that power distribution control device works in the power output of Part I photovoltaic electric energy from distributing and be supplied in load during net powering mode.
5. photovoltaic electric energy management method according to claim 1, is characterized in that, as described in power distribution control device described in step S1 work in grid-connected powering mode, then described step S2 is corresponding comprises following sub-step:
The second power distribution scheme of mating with grid-connected powering mode residing for power distribution control device determined by S21 ', DC-to-DC reversible transducer, is stored in storage battery after the Part III photovoltaic electric energy be assigned to is carried out step-down process based on the second power distribution scheme;
S22 ', two-way inverter are grid-connected by it after the Part IV photovoltaic electric energy be assigned to based on the second power distribution scheme is converted to alternating current;
Wherein, described second power distribution scheme realizes based on the second electric energy power division formula, and this second electric energy power division formula is expressed as follows: P
output (max)=P
battery+ P
grid;
P
output (max)represent photovoltaic generating system the peak power output of photovoltaic electric energy is provided;
P
gridthe power output of the grid-connected Part III photovoltaic electric energy powered on when representing that power distribution control device works in grid-connected powering mode;
P
batteryrepresent that power distribution control device is stored in the Part IV photovoltaic electric energy of storage battery or the power output of storage battery release electric energy when working in grid-connected powering mode.
6. photovoltaic electric energy management method according to claim 5, is characterized in that, described step S22 ' also comprises:
S221 ', as P
grid> P
output (max)then judge photovoltaic generating system supply photovoltaic electric energy Shortcomings, storage battery is switched to discharge mode, the electric energy that storage battery discharges according to the second power distribution scheme is carried out voltage lifting through direct current through DC-to-DC reversible transducer, and be converted to grid-connected after alternating current powering on through inverter;
Wherein, the power output of storage battery obtains by the second battery discharging formulae discovery, and this second battery discharging formula is expressed as follows: P
batteryoutput=P
grid-P
output (max);
P
batteryoutputrepresent the power output of storage battery at discharge mode release electric energy;
P
output (max)represent photovoltaic generating system the peak power output of photovoltaic electric energy is provided;
P
gridthe power output of the grid-connected Part III photovoltaic electric energy powered on when representing that power distribution control device works in grid-connected powering mode;
S222 ', as P
grid< P
output (max), then judge that photovoltaic generating system exports photovoltaic electric energy and exists more than needed, storage battery be switched to charge mode, after step-down process being carried out to this photovoltaic electric energy more than needed by DC-to-DC reversible transducer, be stored in storage battery;
The power output of this photovoltaic electric energy more than needed obtains by the second charge in batteries formulae discovery, and this second charge in batteries formula is expressed as follows: P
suplus=P
output (max)-P
grid;
P
suplusrepresent the power output of this photovoltaic electric energy more than needed.
7. photovoltaic electric energy management method according to claim 2, is characterized in that, described step S0 also comprises following sub-step:
S01, as judged that photovoltaic generating system works in Night according to photovoltaic generating system input current sampled result, then by DC-to-DC reversible transducer or two-way inverter is corresponding turns down DC bus-bar voltage, start anti-reversing clutch simultaneously;
S02, as judged that photovoltaic power generation system output power exceeds the rated power sum of load and storage battery according to photovoltaic generating system input current sampled result, then by DC-to-DC reversible transducer or the corresponding rising DC bus-bar voltage of two-way inverter.
8. an application is as the photovoltaic electric energy management system of the photovoltaic electric energy management method as described in arbitrary in claim 1 to 7, comprise photovoltaic generating system, power transmission network and load, storage battery, it is characterized in that, described system also comprises one end and connects photovoltaic generating system, and the other end connects the power distribution control device of power transmission network and load and storage battery:
Described power distribution control device for get photovoltaic generating system input photovoltaic electric energy time, the power distribution scheme matched is determined based on its current residing powering mode, power on according to power transmission network or load supplying demand, apply this power distribution scheme between storage battery, power transmission network or load, perform corresponding power distribution work.
9. be applied to a power distribution control device for photovoltaic electric energy management system as claimed in claim 8, it is characterized in that, described power distribution control device comprises:
Being connected to the anti-reversing clutch of DC bus, producing adverse current for preventing photovoltaic generating system input current;
Two-way inverter, during for judging that power distribution control device works in from net powering mode, the Part I photovoltaic electric energy be assigned to based on the first power distribution scheme is converted to after alternating current for load, and during for judging that power distribution control device is in grid-connected powering mode, grid-connected after the Part IV photovoltaic electric energy be assigned to based on the second power distribution scheme is converted to alternating current;
DC-to-DC reversible transducer, for judge that power distribution control device works in from net powering mode and storage battery is in charge mode time, be stored in storage battery after the Part II photovoltaic electric energy be assigned to based on the first power distribution scheme is carried out step-down process;
And for judge that power distribution control device works in from net powering mode and storage battery is in discharge mode time, the storage battery electric energy based on the second power distribution scheme release is carried out boosting and processes, and be converted to after alternating current for load through two-way inverter.
10. power distribution control device according to claim 9, it is characterized in that, built-in first MPPT controller of described DC-to-DC reversible transducer, built-in second MPPT controller of described two-way inverter, described first MPPT controller and described second MPPT controller are all for carrying out real-time sampling to photovoltaic power generation system output power, calculate the current peak power output of photovoltaic generating system, according to photovoltaic generating system current peak power output, dynamic adjustments is carried out to DC bus-bar voltage.
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