CN106329555A - Photovoltaic energy storage microgrid system and control method thereof - Google Patents
Photovoltaic energy storage microgrid system and control method thereof Download PDFInfo
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- CN106329555A CN106329555A CN201510364365.7A CN201510364365A CN106329555A CN 106329555 A CN106329555 A CN 106329555A CN 201510364365 A CN201510364365 A CN 201510364365A CN 106329555 A CN106329555 A CN 106329555A
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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 energy storage microgrid system, which comprises a control module, an energy storage module, a current converter and a photovoltaic module, wherein the control module judges electricity utilization time periods; at the first electricity utilization time period, the control module controls the energy storage module to supply power to a load by means of the current converter when electric quantity of the energy storage module is sufficient, and controls the energy storage module to stop supplying power to the load when electric quantity of the energy storage module is insufficient; and at the second electricity utilization time period, the control module controls the current converter to charge the energy storage module by utilizing a power grid. Electric energy generated by the photovoltaic module is input into the power grid and/or supplied to the load, thus the user benefit can be maximized; at the first electricity utilization time period, the control module controls the energy storage module to supply power to the load at first, and then the photovoltaic module and/or the power grid can supply power to the load when electric quantity of the energy storage module is insufficient; and at the second electricity utilization time period, the control module utilizes the power grid for charging the energy storage module, so that electric quantity of the energy storage module can be supplemented. The invention further discloses a control method of the photovoltaic energy storage microgrid system.
Description
Technical field
The present invention relates to photovoltaic art, more specifically, relate to a kind of photovoltaic energy storage micro-grid system and one
The control method of photovoltaic energy storage micro-grid system.
Background technology
Along with increasing and the propelling of developing country's process of industrialization of earth population, various fossil energies are fast
Speed is exhausted, and atmospheric pollution and Ecological Environment Crisis that fossil energy causes during using are the tightest
Weight.
In order to reduce atmospheric pollution, the supply steady in a long-term of the energy of preserving the ecological environment, ensure, progressively change
Becoming existing energy resource structure, greatly developing green energy resource has become the common recognition of various countries.In green energy resource, too
Sun can with its cleaning, efficiently, the feature such as never exhausted become the most promising green energy resource.
In order to promote the universal of solar energy and development, a lot of countries have formulated the subsidies measures of correspondence, electrical network
Company can buy, with higher electricity price, the electric energy that photovoltaic apparatus sends.In this case, photovoltaic is sent out
For the individual of electricity equipment and group user, greatest benefit uses the method for photovoltaic to be preferential by photovoltaic apparatus
The electrical pumping electrical network produced, individual and group user are tried one's best not from photovoltaic apparatus power taking.
Summary of the invention
It is contemplated that at least solve one of technical problem present in prior art.To this end, the present invention needs
A kind of photovoltaic energy storage micro-grid system and the control method of a kind of photovoltaic energy storage micro-grid system are provided.
A kind of photovoltaic energy storage micro-grid system, including photovoltaic module, energy-storage module, control module and the straight change of current
Device, this control module connects this energy-storage module and this inverter, and this energy-storage module connects this inverter
DC terminal, the outfan of this photovoltaic module is connected between exchange end and the electrical network of this inverter, this photovoltaic
The electric energy that module produces inputs this electrical network and/or is load supplying.When this control module is used for judging electricity consumption
Section, if this electricity consumption period was the first electricity consumption period, when the electricity abundance of this energy-storage module, this control mould
It is this load supplying that block is used for controlling this energy-storage module by this inverter, when this energy-storage module electricity not
During foot, this control module is used for controlling this energy-storage module and stops as this load supplying.If this electricity consumption period is
Second electricity consumption period, this control module is used for controlling this inverter and utilizes this electrical network to be that this energy-storage module fills
Electricity, this second electricity consumption period is different from this first electricity consumption period.
In above-mentioned photovoltaic energy storage micro-grid system, the electric energy that photovoltaic module produces inputs this electrical network and/or is negative
Carry power supply, it is possible to make user's maximizing the benefits, in the first electricity consumption period, such as peak of power consumption period or high electricity
The valency period, first control module is load supplying by energy-storage module, when the electricity deficiency of energy-storage module,
Can be load supplying by photovoltaic module and/or electrical network, serve the effect of peak clipping and reduce the electricity consumption of user
Cost.In the second electricity consumption period, such as low power consumption period or low rate period, control module utilizes electrical network
Charge for energy-storage module, so that energy-storage module electric energy supplement, serve and fill out the effect of paddy and reduce user's
Electric cost.
In one embodiment, this inverter is the mesh that discharge power is this inverter of this load supplying
Mark power and the smaller in the discharge power limit value of this energy-storage module.
In one embodiment, this photovoltaic energy storage micro-grid system includes power monitoring module, and this power is supervised
Surveying between exchange end and the outfan of this photovoltaic module that module is connected to this inverter, this control module is even
Connect this power monitoring module.If this electricity consumption period is this first electricity consumption period, this control module is used for gathering
The power of this power monitoring module detection, and according to the current output work of the power of this detection, this inverter
The output limit value of rate and this inverter calculates the target power of this inverter.
In one embodiment, if this electricity consumption period is this second electricity consumption period, this control module is used for
Controlling this inverter utilizes this electrical network to be this energy-storage module with the maximum charge power that this energy-storage module allows
Charging.
In one embodiment, this energy-storage module includes energy-storage battery and DC-DC converter, should
DC-DC converter connects the DC terminal of this energy-storage battery and this inverter.This control module is used for controlling
Make the first voltage that this energy-storage battery exports by this DC-DC converter and be converted to the second voltage, and will
This second voltage inputs the DC terminal to this inverter, and controls this DC-DC converter by this change of current
First charging voltage of the DC terminal output of device is converted to the second charging voltage, and will utilize this second charging
Voltage is the charging of this energy-storage battery.
In one embodiment, this photovoltaic module includes photovoltaic panel and photovoltaic DC-to-AC converter, this light die face
The outfan of plate connects the input of this photovoltaic DC-to-AC converter, and the outfan of this photovoltaic DC-to-AC converter is connected to this and changes
Between exchange end and this electrical network of stream device.
The control method of a kind of photovoltaic energy storage micro-grid system, this photovoltaic energy storage micro-grid system includes photovoltaic mould
Group, energy-storage module, control module and inverter, this control module connects this energy-storage module and this inverter,
This energy-storage module connects the DC terminal of this inverter, and the outfan of this photovoltaic module is connected to this inverter
Between exchange end and electrical network, the electric energy that this photovoltaic module produces inputs this electrical network and/or is load supplying.
The control method of this photovoltaic energy storage micro-grid system comprises the following steps:
S1: this control module judges the electricity consumption period, if this electricity consumption period was the first electricity consumption period, enters
Step S2, if this electricity consumption period was the second electricity consumption period, enters step S3；.
S2: when the electricity abundance of this energy-storage module, this control module controls this energy-storage module by being somebody's turn to do
Inverter is this load supplying, and when the electricity deficiency of this energy-storage module, this control module controls this energy storage
Module stops as this load supplying；
S3: this control module controls this inverter and utilizes this electrical network to be the charging of this energy-storage module.
In one embodiment, in step s 2, this inverter is the discharge power of this load supplying
For the target power of this inverter and the smaller in the discharge power limit value of this energy-storage module.
In one embodiment, this photovoltaic energy storage micro-grid system includes power monitoring module, and this power is supervised
Surveying between exchange end and the outfan of this photovoltaic module that module is connected to this inverter, this control module is even
Connect this power monitoring module.Step S2 includes: this control module gathers the detection of this power monitoring module
Power, and according to the current output of the power of this detection, this inverter and the output work of this inverter
Rate limit value calculates the target power of this inverter.
In one embodiment, step S3 includes: this control module controls this inverter and utilizes this electricity
Net is the charging of this energy-storage module with the maximum charge power that this energy-storage module allows.
In one embodiment, this energy-storage module includes energy-storage battery and DC-DC converter, should
DC-DC converter connects the DC terminal of this energy-storage battery and this inverter.Step S2 includes: this control
Molding block controls the first voltage that this energy-storage battery exports by this DC-DC converter and is converted to the second electricity
Pressure, and by the DC terminal of this second voltage input to this inverter.Step S3 includes: this control module
Control this DC-DC converter and the first charging voltage that the DC terminal of this inverter exports is converted to the
Two charging voltages, and be the charging of this energy-storage battery by utilizing this second charging voltage.
The additional aspect of the present invention and advantage will part be given in the following description, and part is by from following
Description becomes obvious, or recognized by the practice of the present invention.
Accompanying drawing explanation
Embodiment is retouched by the above-mentioned and/or additional aspect of the present invention and advantage from combining accompanying drawings below
Will be apparent from easy to understand in stating, wherein:
Fig. 1 is the module diagram of the photovoltaic energy storage micro-grid system of better embodiment of the present invention；And
Fig. 2 is the flow chart of the control method of the photovoltaic energy storage micro-grid system of better embodiment of the present invention.
Detailed description of the invention
Embodiments of the present invention are described below in detail, and the example of this embodiment is shown in the drawings, its
In the most same or similar label represent same or similar element or there is same or like merit
The element of energy.The embodiment described below with reference to accompanying drawing is exemplary, is only used for explaining this
Bright, and be not considered as limiting the invention.
In describing the invention, it is to be understood that term " center ", " longitudinally ", " laterally ",
" length ", " width ", " thickness ", " going up ", " under ", " front ", " afterwards ", " left ",
" right ", " vertically ", " level ", " top ", " end ", " interior ", " outward ", " up time
The orientation of the instructions such as pin ", " counterclockwise " or position relationship be based on orientation shown in the drawings or pass, position
System, be for only for ease of describe the present invention and simplify describe rather than instruction or hint indication device or
Element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to this
The restriction of invention.Additionally, term " first ", " second " are only used for describing purpose, and it is not understood that
For indicating or imply relative importance or the implicit quantity indicating indicated technical characteristic.Thus, limit
Surely have " first ", the feature of " second " can express or implicitly include one or more should
Feature.In describing the invention, " multiple " are meant that two or more, unless otherwise bright
The most concrete restriction.
In describing the invention, it should be noted that unless otherwise clearly defined and limited, term
" install ", " being connected ", " connection " should be interpreted broadly, and connect, also for example, it may be fixing
Can be to removably connect, or be integrally connected；Can be mechanically connected, it is also possible to be electrical connection or can
With mutual communication；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, can be two
The connection of element internal or the interaction relationship of two elements.For those of ordinary skill in the art
Speech, can understand above-mentioned term concrete meaning in the present invention as the case may be.
In the present invention, unless otherwise clearly defined and limited, in second feature, it " goes up " fisrt feature
Or it " under " can include that the first and second features directly contact, it is also possible to include the first and second features
It not directly contact but by the other characterisation contact between them.And, fisrt feature is second
Feature " on ", " top " and " above " include fisrt feature directly over second feature and oblique on
Side, or it is merely representative of fisrt feature level height higher than second feature.Fisrt feature is at second feature " it
Under ", " lower section " and " below " include fisrt feature directly over second feature and oblique upper, or only
Only represent that fisrt feature level height is less than second feature.
Following disclosure provides many different embodiments or example for realizing the difference of the present invention
Structure.In order to simplify disclosure of the invention, hereinafter parts and setting to specific examples are described.
Certainly, they are the most merely illustrative, and are not intended to limit the present invention.Additionally, the present invention can be
Repeat reference numerals and/or reference letter in different examples, this repetition is to simplify and clearly mesh
, itself do not indicate the relation between discussed various embodiment and/or setting.Additionally, this
The bright various specific technique provided and the example of material, but those of ordinary skill in the art can anticipate
Know the application to other techniques and/or the use of other materials.
Please join Fig. 1, the photovoltaic energy storage microgrid (micro grid) that better embodiment of the present invention provides is
System 100 includes photovoltaic module 102, energy-storage module 104, control module 106 and inverter 108.
This control module 106 connects this energy-storage module 104 and this energy-storage module 104 of this inverter 108
The outfan of this photovoltaic module 102 of DC terminal connecting this inverter 108 is connected to this inverter 108
Exchange end and electrical network 400 between, this photovoltaic module 102 produce electric energy input this electrical network 400 and
/ or power for load 500.In present embodiment, load 500 is connected to the exchange of inverter 108
Between end and the outfan of this photovoltaic module 102.
Specifically, photovoltaic module 102 includes photovoltaic panel 110 and photovoltaic DC-to-AC converter 112, this optical mode
The outfan of panel 110 connects the input of this photovoltaic DC-to-AC converter 112, this photovoltaic DC-to-AC converter 112
Outfan, as the outfan of photovoltaic module 102, is connected to exchange end and the electrical network of this inverter 108
Between.
Photovoltaic panel 110 may be provided at outdoor and sun-drenched place, to convert the solar into electricity
Energy.Photovoltaic panel 110 includes that the interconnection of multiple photovoltaic cell is formed, and the photoelectricity of photovoltaic panel 110 turns
Conversion materials can be selected for the material known known to those skilled in the art, it is preferred that select conversion efficiency higher
Photoelectric conversion material is as the photoelectric conversion material of photovoltaic panel 110.
The electric energy that this photovoltaic panel 110 produces is to input this electrical network 400 and power, also for load 500
It is input electrical network 400, or powers for load 500, depend on power and the photovoltaic module of load 500
The power of 102 outputs.If the power of photovoltaic module 102 output is more than the power of load 500, then light
The electric energy part that volt module 102 produces is load 500 power supply, another part input electrical network 400.
If load 500 does not works, the electric energy input electrical network 400 that photovoltaic module 102 produces.
If the power of photovoltaic module 102 output is less than or equal to the power of load 500, then photovoltaic module
102 electric energy produced are load 500 power supply, it addition, the power in photovoltaic module 102 output is less than
When loading the power of 500, electrical network 400 is also for load 500 power supply, supplementary photovoltaic module 102 deficiency
Electric energy.
If photovoltaic module 102 does not export electric energy, then electrical network 400 is load 500 power supply.I.e. at figure
A point shown in 1 meets Kirchhoff's law so that the situation that photovoltaic module 102 self adaptation is different.
The output bus of energy-storage module 104 is as the dc bus of photovoltaic energy storage micro-grid system 100.This
In embodiment, it is preferred that this energy-storage module 104 includes energy-storage battery 114 and DC/DC conversion
Device 116 (DC/DC transducer), this DC-DC converter 116 connects this energy-storage battery 114
And the DC terminal of this inverter 108.
This control module 106 is used for controlling this DC-DC converter 116 by this energy-storage battery 114
First voltage of output is converted to the second voltage, and inputs this second voltage to this inverter 108
DC terminal, and control that the DC terminal of this inverter 108 exports by this DC-DC converter 108 the
One charging voltage is converted to the second charging voltage, and is this energy-storage battery by utilizing this second charging voltage
114 chargings.
Therefore, when requiring the output voltage amplitude of energy-storage battery 114, control module 106 can
With the output voltage by DC-DC converter 116 lifting energy-storage battery 114 to meet inverter
DC voltage needed for 108.Similarly, in order to meet charging or the electric power storage demand of energy-storage battery 114,
DC-DC converter 116 supports the operation of Bidirectional charging-discharging.In other embodiments, energy storage mould
Block 104 can be individually for energy-storage battery, can omit DC-DC converter.
Inverter 108 can be DC/AC power inverter (DC/AC inverter), and it is two-way inversion
Device, the DC terminal of inverter 108 is connected with the output bus of energy-storage module 104, inverter 108
Exchange end is connected with load 500, the outfan of photovoltaic DC-to-AC converter 112 and electrical network 400.Inverter 108
May operate under constant power-mode, the target power output issued according to control module 106.
In order to meet charging or the electric power storage demand of energy-storage battery 114, the fortune of the two-way change of current supported by inverter 108
OK.It addition, can be able to select according to electrical network 400 wiring and the difference of user's request, inverter 108
Single-phase, three-phase or double fire wire etc. are dissimilar.And according to hardware cost and user's request, inverter 108
The different hardware topology such as two level, three level or single-phase H bridge can be selected.
In present embodiment, this photovoltaic energy storage micro-grid system 100 includes power monitoring module 118, should
Power monitoring module 118 is connected to exchange end and the output of this photovoltaic module 102 of this inverter 108
Between end, this control module 406 connects this power monitoring module 118.
This power monitoring module 118 is to inverter 108, load 500 and electrical network 400, photovoltaic inversion
Between device 112, the power (i.e. between photovoltaic DC-to-AC converter 112 and load 400) monitors, and will
The power information detected is sent to control module 106.This power monitoring module 118 can be special
Power monitoring apparatus, power information is conveyed directly to control module 106 by this power monitoring apparatus.Should
Power monitoring module 118 can also be electric current and voltage sensor, and electric current, information of voltage are sent to control
Corresponding power is calculated by control module 106 after molding block 106.In present embodiment, power monitoring
Module 118 flows to the power of load as positive with electrical network.
Therefore, control module 106 can gather the power of this power monitoring module 118 detection, to carry out
Corresponding control.
Control module 106 can connect energy-storage module 104 (if energy-storage battery is with straight respectively by order wire
Stream/direct current transducer), inverter 108 and power monitoring module 118.Net can be used as required
Line, CAN line or Serial Port Line are as order wire.If power monitoring module 118 uses electric current and voltage
Sensor, then order wire uses corresponding sensor connecting line.
Control module 106 is responsible for modules, device and equipment in photovoltaic energy storage micro-grid system 100
Control, dispatch and information forwarding.Control module 106 receives the operation of modules, device and equipment
Parameter, and information is collected, it is respectively used to the start and stop of photovoltaic energy storage micro-grid system 100, photovoltaic maximum
Result coutrolling, the process etc. of outbound data operate.According to actual needs, the function of control module 106
Can be integrated in inverter 108 or other control unit, it is also possible to be one independent
Control module or equipment.
This control module 106 is used for judging the electricity consumption period.In present embodiment, the electricity consumption period is provided with
First electricity consumption period and the second electricity consumption period.When first electricity consumption period can be peak of power consumption period or high electricity price
Section, the second electricity consumption period can be low power consumption period or low rate period.Arranging of electricity consumption period is predeterminable
In control module 106, control module 106 can obtain the time from timing module (not shown).Meter
Time module can integrate with control module 106, an or single timing module.Electricity consumption
Peak period or high rate period, and low power consumption period or low rate period can be to local electrical supplier inquiries
To be suitable for practical situation.It addition, different peak of power consumption periods or high electricity can be arranged different seasons
Valency period, and different low power consumption periods or low rate period.
If this electricity consumption period was the first electricity consumption period, when the electricity abundance of this energy-storage module 104, should
It is load 500 power supply that control module 106 is used for controlling this energy-storage module 104 by this inverter 108,
When the electricity deficiency of this energy-storage module 104, this control module 106 is used for controlling this energy-storage module 104
Stop powering for this load 500.Such as, control module 106 can control inverter 108 and close, and makes
Energy-storage module 104 stops output electric energy.
In this case, if there being load 500 unlatching, then, load 500 will be by photovoltaic module
102 and/or electrical network 400 power.Particular situation can be joined above-mentioned adaptive about photovoltaic module 102
Explanation.
Therefore, control module 106 controls inverter 108 and puts in peak of power consumption period or high rate period
Electricity (for load supplying), alleviates the electrical network 400 use Voltage force in the peak of power consumption period, plays and cut
The effect of the electric cost of peak and reduction user.
Specifically, in the present embodiment, control module 106 can gather the battery of energy-storage module 104
Dump energy (state of charge, SOC) is the most sufficient to judge the electricity of energy-storage module 104.
Such as, when SOC >=5%, control module 106 judges that the electricity of energy-storage module 104 is sufficient, when
During SOC ＜ 5%, control module 106 judges that the electricity of energy-storage module 104 is not enough.
The load 500 powered by energy-storage module 104 can be low-power load, and such as, power is thousand of
Load 500 within watt is powered by energy-storage module 104.
This inverter 108 is the target merit that discharge power is this inverter 108 of this load 500 power supply
Rate and the smaller in the discharge power limit value of this energy-storage module 104.
Specifically, when loading 500 and just opening, by photovoltaic module 102 and/or electrical network 400 it is first
Load 500 power supply.Now, the power that this control module 106 detects according to power monitoring module 118
P1(such as flowing to the direction of load 500 for just with electrical network 400), current defeated of this inverter 108
Go out power PdcacAnd the output limit value P of this inverter 108b(such as flow to negative with electrical network 400
The direction carrying 500 is just) calculate the target power P of this inverter 108objtemp.Load 500 firm
During unlatching, the output P that this inverter 108 is currentdcacIt is zero.
The power P of power monitoring module 118 detection1The output P current with this inverter 108dcac
And for be supplied to load the power P of 500L, i.e. bearing power PL=P1+Pdcac。
Control module 106 is according to bearing power P afterwardsLOutput limit value P with inverter 108b
Calculate the target power P of inverter 108objtemp(such as flow to load 500 with inverter 108
Direction is just), Pobjtemp=PL-Pb.The output limit value P of inverter 108bCan use according to reality
Electricity consumption situation in family sets, the typically equal to or greater than performance number of user's important load, or the power of agreement
Value, such as 5 kilowatts.
Control module 106 is by the target power P of calculated inverter 108objtempWith current storage
The discharge power limit value P that energy module 104 allowsLimitCompare, if PobjtempAt energy-storage module 104
In the range of the discharge power allowed, then control module 106 is by the target power P of inverter 108objtemp
As the discharge power P that inverter 108 is finalobj；If PobjtempAllow beyond energy-storage module 104
In the range of discharge power, then the discharge power limit value that energy-storage module 104 is allowed by control module 106
PLimitAs the discharge power P that inverter 108 is finalobj.So, energy-storage module 104 can be protected,
The discharge power that can make again photovoltaic energy storage micro-grid system 100 maximizes.
It addition, energy-storage module 104 is load 500 power supply so that photovoltaic module 102 need not be for load
500 power supplies or be reduced to load the electric energy of 500 power supplies, and then make the electricity that photovoltaic module 102 produces
Electrical network 400 can be inputted more, alleviate electrical network 400 at peak of power consumption period or high rate period
With Voltage force, serve the effect of part peak clipping, could be used that the benefit at family simultaneously.
If this electricity consumption period is that this control module 106 of the second electricity consumption period is for controlling this inverter 108
This electrical network 400 is utilized to charge for this energy-storage module 104, when the second electricity consumption period was different from the first electricity consumption
Section.
Specifically, the second electricity consumption period was low power consumption period or low rate period, such as, control module
106 can control inverter 108 inputs electric energy from the exchange end of inverter 108, and from inverter 108
DC terminal output electric energy.Now, energy-storage module 104 it is in charged state, therefore, loads 500
Can be powered by electrical network 400 and/or photovoltaic module 102.
Utilize this electrical network 400 with this storage it is preferred that control module 106 is used for controlling this inverter 108
The maximum charge power that energy module 104 allows is that this energy-storage module 104 charges.So, can be faster
Ground charges for energy-storage battery 114, also will not damage energy-storage battery 114 simultaneously.
After the electricity of energy-storage battery 114 is full of, control module 106 controls this inverter 108 and stops
Charge for energy-storage module 104.It addition, when the time exceeds the low power consumption period, control module 106
Also stop charging for energy-storage module 104.Further, in order to ensure the electricity energy of energy-storage battery 114
Enough full, the concrete time of low power consumption period can be adjusted according to practical situation.
Owing to the electricity price of electrical network 400 is relatively inexpensive in the low power consumption period, so inverter 108 is in electricity consumption
It is that energy-storage battery 114 charges during low ebb, plays the effect filling out paddy, and poor by the electricity price of peak load shifting
Make user's maximizing the benefits.
In sum, in above-mentioned photovoltaic energy storage micro-grid system 100, the electric energy that photovoltaic module 102 produces
Input this electrical network 400 and/or power for load 500, it is possible to making user's maximizing the benefits, use first
The electricity period, such as peak of power consumption period or high rate period, control module 106 is first by energy-storage module 104
For load supplying, when the electricity deficiency of energy-storage module 104, can be by photovoltaic module 102 and/or electrical network
400 is load 500 power supply, serves the effect of peak clipping and reduces the electric cost of user.Second
The electricity consumption period, such as low power consumption period or low rate period, control module 106 utilizes the electrical network 400 to be
Energy-storage module 104 charges, so that energy-storage module 104 electric energy supplement, serves effect and the fall filling out paddy
The electric cost of low user.
Therefore, above-mentioned photovoltaic energy storage micro-grid system 100 alleviate electrical network 400 peak of power consumption use voltage
Power simultaneously, by the electricity price of peak load shifting poor (electricity price during low power consumption than peak of power consumption time electricity price low)
User's maximizing the benefits is made with photovoltaic generation.
Please join Fig. 2, better embodiment of the present invention provides the controlling party of a kind of photovoltaic energy storage micro-grid system
Method.This control method can be realized by the photovoltaic energy storage micro-grid system 100 of embodiment of above.This photovoltaic
The control method of energy storage micro-grid system comprises the following steps:
S1: this control module 106 judges the electricity consumption period, if this electricity consumption period was the first electricity consumption period,
Enter step S2, if this electricity consumption period was the second electricity consumption period, enter step S3；.
S2: when the electricity abundance of this energy-storage module 104, this control module 106 controls this energy storage mould
Block 104 is powered for this load 500 by this inverter 108, when this energy-storage module 104 electricity not
During foot, this control module 106 controls this energy-storage module 104 and stops powering for this load 500；
S3: this control module 106 controls this inverter 108 and utilizes this electrical network 400 to be this energy-storage module
104 chargings.
In step S1, present embodiment, the electricity consumption period is provided with the first electricity consumption period and the second electricity consumption
Period.First electricity consumption period can be the peak of power consumption period on daytime, and the second electricity consumption period can be the use in evening
Electricity low-valley interval.Arranging of electricity consumption period is predeterminable in control module 106, and control module 106 can
The time is obtained from timing module (not shown).Timing module can be integrated in one with control module 106
Rise, or a single timing module.
In step s 2, in the present embodiment, control module 106 can gather energy-storage module 104
Battery dump energy (state of charge, SOC) to judge that the electricity of energy-storage module 104 is
No abundance.Such as, when SOC >=5%, control module 106 judges that the electricity of energy-storage module 104 fills
Foot, as SOC ＜ 5%, control module 106 judges that the electricity of energy-storage module 104 is not enough.
This inverter 108 is the target merit that discharge power is this inverter 108 of this load 500 power supply
Rate and the smaller in the discharge power limit value of this energy-storage module 104.
Step S2 includes: this control module 106 gathers the power of this power monitoring module 118 detection,
And defeated according to the current output of the power of this detection, this inverter 108 and this inverter 108
Go out power limit and calculate the target power of this inverter 108.
Specifically, when loading 500 and just opening, by photovoltaic module 102 and/or electrical network 400 it is first
Load 500 power supply.Now, the power that this control module 106 detects according to power monitoring module 118
P1(such as flowing to the direction of load 500 for just with electrical network 400), current defeated of this inverter 108
Go out power PdcacAnd the output limit value P of this inverter 108b(such as flow to negative with electrical network 400
The direction carrying 500 is just) calculate the target power P of this inverter 108objtemp.Load 500 firm
During unlatching, the output P that this inverter 108 is currentdcacIt is zero.
The power P of power monitoring module 118 detection1The output P current with this inverter 108dcac
And for be supplied to load the power P of 500L, i.e. bearing power PL=P1+Pdcac。
Control module 106 is according to bearing power P afterwardsLOutput limit value P with inverter 108b
Calculate the target power P of inverter 108objtemp(such as flow to load 500 with inverter 108
Direction is just), Pobjtemp=PL-Pb.The output limit value P of inverter 108bCan use according to reality
Electricity consumption situation in family sets, the typically equal to or greater than performance number of user's important load, or the power of agreement
Value, such as 5 kilowatts.
Control module 106 is by the target power P of calculated inverter 108objtempWith current storage
The discharge power limit value P that energy module 104 allowsLimitCompare, if PobjtempAt energy-storage module 104
In the range of the discharge power allowed, then control module 106 is by the target power P of inverter 108objtemp
As the discharge power P that inverter 108 is finalobj；If PobjtempAllow beyond energy-storage module 104
In the range of discharge power, then the discharge power limit value that energy-storage module 104 is allowed by control module 106
PLimitAs the discharge power P that inverter 108 is finalobj.So, energy-storage module 104 can be protected,
The discharge power that can make again photovoltaic energy storage micro-grid system 100 maximizes.
It addition, energy-storage module 104 is load 500 power supply so that photovoltaic module 102 need not be for load
500 power supplies or be reduced to load the electric energy of 500 power supplies, and then make the electricity that photovoltaic module 102 produces
Electrical network 400 can be inputted more, alleviate the electrical network 400 use Voltage force in the peak of power consumption period, rise
Arrive the effect of part peak clipping.
Further, if require the output voltage amplitude of energy-storage battery 114, step S2 includes:
This control module 106 controls that this energy-storage battery 114 is exported by this DC-DC converter 116
One voltage is converted to the second voltage, and by the DC terminal of this second voltage input to this inverter 108.
Therefore, control module 106 can be by DC-DC converter 116 lifting energy-storage battery 114
Output voltage is to meet the DC voltage needed for inverter 108.
In step s3, control module 106 can control the inverter 108 exchange from inverter 108
End input electric energy, and export electric energy from the DC terminal of inverter 108.Now, by energy-storage module 104
Being in charged state, therefore, load 500 can be powered by electrical network 400 and/or photovoltaic module 102.
It is preferred that step S3 includes: control module 106 controls this inverter 108 and utilizes this electrical network
400 with this energy-storage module 104 allow maximum charge power be that this energy-storage module 104 charges.So,
Can charge for energy-storage battery 114 quickly, also will not damage energy-storage battery 114 simultaneously.
After the electricity of energy-storage battery 114 is full of, control module 106 controls this inverter 108 and stops
Charge for energy-storage module 104.It addition, when the time exceeds the low power consumption period, control module 106
Also stop charging for energy-storage module 104.Further, in order to ensure the electricity energy of energy-storage battery 114
Enough full, the concrete time of low power consumption period can be adjusted according to practical situation.
Owing to the electricity price of electrical network 400 is relatively inexpensive in the low power consumption period, so inverter 108 is in electricity consumption
It is that energy-storage battery 114 charges during low ebb, plays the effect filling out paddy, and poor by the electricity price of peak load shifting
Make user's maximizing the benefits.
Further, if require the charging voltage amplitude of energy-storage battery 114, step S3 includes:
This control module 106 controls this DC-DC converter 116 by defeated for the DC terminal of this inverter 108
The first charging voltage gone out is converted to the second charging voltage, and is this energy storage by utilizing this second charging voltage
Battery 114 charges.
In sum, in the control method of above-mentioned photovoltaic energy storage micro-grid system, photovoltaic module 102 produces
Electric energy input this electrical network 400 and/or for load 500 power supply, it is possible to make user's maximizing the benefits,
First electricity consumption period, such as peak of power consumption period or high rate period, control module 106 is first by energy storage
Module 104 is load 500 power supply, when the electricity deficiency of energy-storage module 104, and can be by photovoltaic module
102 and/or electrical network 400 be load 500 power supply, serve the effect of peak clipping and reduce the electricity consumption of user
Cost.In the second electricity consumption period, such as low power consumption period or low rate period, control module 106 profit
Charge for energy-storage module 104 with electrical network 400, so that energy-storage module 104 electric energy supplement, serve and fill out
The effect of paddy and the electric cost of reduction user.
In the description of this specification, reference term " embodiment ", " some embodiments ",
The description of " exemplary embodiment ", " example ", " concrete example " or " some examples " etc.
Mean that the specific features, structure, material or the feature that combine this embodiment or example description are contained in this
In at least one embodiment of invention or example.In this manual, the schematic table to above-mentioned term
State and be not necessarily referring to identical embodiment or example.And, the specific features of description, structure, material
Material or feature can combine in any one or more embodiments or example in an appropriate manner.
While embodiments of the present invention have been illustrated and described, those of ordinary skill in the art is permissible
Understand: can these embodiments be carried out multiple in the case of without departing from the principle of the present invention and objective
Changing, revise, replace and modification, the scope of the present invention is limited by claim and equivalent thereof.
Claims (11)
1. a photovoltaic energy storage micro-grid system, it is characterised in that include photovoltaic module, energy-storage module,
Control module and inverter, this control module connects this energy-storage module and this inverter, and this energy-storage module is even
Connecing the DC terminal of this inverter, the outfan of this photovoltaic module is connected to exchange end and the electrical network of this inverter
Between, the electric energy that this photovoltaic module produces inputs this electrical network and/or is load supplying；
This control module is used for judging the electricity consumption period, if this electricity consumption period was the first electricity consumption period, when this storage
Can the electricity abundance of module time, it is that this is born that this control module is used for controlling this energy-storage module by this inverter
Carrying power supply, when the electricity deficiency of this energy-storage module, this control module is used for controlling this energy-storage module and stops
For this load supplying；
If this electricity consumption period was the second electricity consumption period, this control module is used for controlling this inverter and utilizes this electricity
Net is the charging of this energy-storage module, and this second electricity consumption period is different from this first electricity consumption period.
2. photovoltaic energy storage micro-grid system as claimed in claim 1, it is characterised in that this inverter is
The discharge power of this load supplying is the target power discharge power limit with this energy-storage module of this inverter
Smaller in value.
3. photovoltaic energy storage micro-grid system as claimed in claim 2, it is characterised in that this photovoltaic energy storage
Micro-grid system includes power monitoring module, and this power monitoring module is connected to the exchange end of this inverter and is somebody's turn to do
Between the outfan of photovoltaic module, this control module connects this power monitoring module；
If this electricity consumption period is this first electricity consumption period, this control module is used for gathering this power monitoring module
The power of detection, and according to the current output of the power of this detection, this inverter and this inverter
Output limit value calculates the target power of this inverter.
4. photovoltaic energy storage micro-grid system as claimed in claim 1, it is characterised in that if during this electricity consumption
Section is this second electricity consumption period, and this control module is used for controlling this inverter and utilizes this electrical network with this energy storage mould
The maximum charge power that block allows is the charging of this energy-storage module.
5. photovoltaic energy storage micro-grid system as claimed in claim 1, it is characterised in that this energy-storage module
Including energy-storage battery and DC-DC converter, this DC-DC converter connects this energy-storage battery and is somebody's turn to do
The DC terminal of inverter；
This control module is for controlling the first voltage that this energy-storage battery is exported by this DC-DC converter
Be converted to the second voltage, and by the DC terminal of this second voltage input to this inverter, and control this direct current
The first charging voltage that the DC terminal of this inverter exports is converted to the second charged electrical by/direct current transducer
Pressure, and be the charging of this energy-storage battery by utilizing this second charging voltage.
6. photovoltaic energy storage micro-grid system as claimed in claim 1, it is characterised in that this photovoltaic module
Including photovoltaic panel and photovoltaic DC-to-AC converter, the outfan of this optical mode panel connects the input of this photovoltaic DC-to-AC converter
End, the outfan of this photovoltaic DC-to-AC converter is connected between the exchange end of this inverter and this electrical network.
7. a control method for photovoltaic energy storage micro-grid system, this photovoltaic energy storage micro-grid system includes photovoltaic
Module, energy-storage module, control module and inverter, this control module connects this energy-storage module and this changes
Stream device, this energy-storage module connects the DC terminal of this inverter, and the outfan of this photovoltaic module is connected to this and changes
Between exchange end and the electrical network of stream device, the electric energy that this photovoltaic module produces inputs this electrical network and/or for loading
Power supply；
It is characterized in that, the control method of this photovoltaic energy storage micro-grid system comprises the following steps:
S1: this control module judges the electricity consumption period, if this electricity consumption period was the first electricity consumption period, enters
Step S2, if this electricity consumption period was the second electricity consumption period, enters step S3；
S2: when the electricity abundance of this energy-storage module, this control module controls this energy-storage module by being somebody's turn to do
Inverter is this load supplying, and when the electricity deficiency of this energy-storage module, this control module controls this energy storage
Module stops as this load supplying；
S3: this control module controls this inverter and utilizes this electrical network to be the charging of this energy-storage module.
8. the control method of photovoltaic energy storage micro-grid system as claimed in claim 7, it is characterised in that
In step s 2, this inverter be this load supplying the target power that discharge power is this inverter with
Smaller in the discharge power limit value of this energy-storage module.
9. the control method of photovoltaic energy storage micro-grid system as claimed in claim 8, it is characterised in that
This photovoltaic energy storage micro-grid system includes power monitoring module, and this power monitoring module is connected to this inverter
Between exchange end and the outfan of this photovoltaic module, this control module connects this power monitoring module；
Step S2 includes: this control module gathers the power of this power monitoring module detection, and according to this
Output and the output limit value of this inverter that the power of detection, this inverter are current calculate this and change
The target power of stream device.
10. the control method of photovoltaic energy storage micro-grid system as claimed in claim 7, it is characterised in that
Step S3 includes: this control module controls this inverter and utilizes this electrical network to allow with this energy-storage module
Big charge power is the charging of this energy-storage module.
The control method of 11. photovoltaic energy storage micro-grid systems as claimed in claim 7, it is characterised in that
This energy-storage module includes energy-storage battery and DC-DC converter, and this DC-DC converter connects this storage
Can battery and the DC terminal of this inverter；
Step S2 includes: this control module controls what this energy-storage battery was exported by this DC-DC converter
First voltage is converted to the second voltage, and by the DC terminal of this second voltage input to this inverter；
Step S3 includes that this control module controls this DC-DC converter by the DC terminal of this inverter
First charging voltage of output is converted to the second charging voltage, and is this storage by utilizing this second charging voltage
Can battery charging.
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