CN106329555B - The control method of photovoltaic energy storage micro-grid system and photovoltaic energy storage micro-grid system - Google Patents
The control method of photovoltaic energy storage micro-grid system and photovoltaic energy storage micro-grid system Download PDFInfo
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- CN106329555B CN106329555B CN201510364365.7A CN201510364365A CN106329555B CN 106329555 B CN106329555 B CN 106329555B CN 201510364365 A CN201510364365 A CN 201510364365A CN 106329555 B CN106329555 B CN 106329555B
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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
Abstract
In photovoltaic energy storage micro-grid system disclosed by the invention, control module judges the electricity consumption period, if the first electricity consumption period, when the electricity abundance of energy-storage module, it is load supplying that control module, which controls energy-storage module by inverter, when the not enough power supply of energy-storage module, control module controls energy-storage module and stops being load supplying.If the second electricity consumption period, it is energy-storage module charging that control module, which controls inverter using power grid,.In above-mentioned photovoltaic energy storage micro-grid system, the electric energy input power grid and/or be load supplying that photovoltaic mould group generates, it is able to use family maximizing the benefits, in the first electricity consumption period, control module is first load supplying by energy-storage module, when the not enough power supply of energy-storage module, it can be load supplying by photovoltaic mould group and/or power grid, in the second electricity consumption period, control module is energy-storage module charging using power grid, so that energy-storage module electric energy supplement.Invention additionally discloses a kind of control methods of photovoltaic energy storage micro-grid system.
Description
Technical field
The present invention relates to photovoltaic arts, more specifically, are related to a kind of photovoltaic energy storage micro-grid system and a kind of photovoltaic energy storage
The control method of micro-grid system.
Background technique
With the growth of earth population and the propulsion of developing country's process of industrialization, various fossil energies are exhausted rapidly,
And in fossil energy use process caused by atmosphere pollution and Ecological Environment Crisis also get worse.
In order to reduce the supply steady in a long-term of atmosphere pollution, the energy of preserving the ecological environment, guarantee, existing energy is altered in steps
Source structure greatly develops the common recognition that green energy resource has become various countries.In green energy resource, solar energy is cleaned with it, is efficient, never withered
The features such as exhausting is as most promising green energy resource.
In order to push the universal of solar energy and development, many countries have formulated corresponding subsidies measures, and grid company can be with
The electric energy that higher electricity price purchase photovoltaic apparatus issues.In this case, the individual of photovoltaic power generation equipment and group are used
For family, greatest benefit is the electrical pumping power grid for preferentially generating photovoltaic apparatus, personal and group user using the method for photovoltaic
As far as possible electricity is not taken from photovoltaic apparatus.
Summary of the invention
The present invention is directed at least solve one of the technical problems existing in the prior art.For this purpose, the present invention needs to provide one
Kind photovoltaic energy storage micro-grid system and a kind of control method of photovoltaic energy storage micro-grid system.
A kind of photovoltaic energy storage micro-grid system, including photovoltaic mould group, energy-storage module, control module and straight inverter, the control
Module connects the energy-storage module and the inverter, which connects the DC terminal of the inverter, the output of the photovoltaic mould group
End is connected between the exchange end of the inverter and power grid, and the electric energy which generates inputs the power grid and/or to load
Power supply.The control module is for judging the electricity consumption period, if the electricity consumption period was the first electricity consumption period, when the electricity of the energy-storage module
When sufficient, which is the load supplying for controlling the energy-storage module by the inverter, when the electricity of the energy-storage module
When amount is insufficient, which stops being the load supplying for controlling the energy-storage module.If the electricity consumption period is the second electricity consumption
Period, the control module are energy-storage module charging for controlling the inverter using the power grid, and the second electricity consumption period is different
In the first electricity consumption period.
In above-mentioned photovoltaic energy storage micro-grid system, the electric energy that photovoltaic mould group generates inputs the power grid and/or is load supplying, energy
Enough make user's maximizing the benefits, in the first electricity consumption period, such as peak of power consumption period or high rate period, control module is first by storing up
Energy module is load supplying, when the not enough power supply of energy-storage module, can be load supplying by photovoltaic mould group and/or power grid, play
The effect of peak clipping and the electric cost for reducing user.In the second electricity consumption period, such as low power consumption period or low rate period, control
Molding block is energy-storage module charging using power grid, so that energy-storage module electric energy supplement, plays valley-fill effect and reduce user
Electric cost.
In one embodiment, the inverter be target power that the discharge power of the load supplying is the inverter with
Smaller in the discharge power limit value of the energy-storage module.
In one embodiment, which includes power monitoring module, which connects
It connects between the exchange end of the inverter and the output end of the photovoltaic mould group, which connects the power monitoring module.If
The electricity consumption period be the first electricity consumption period, the control module be used for acquire the power monitoring module detection power, and according to
The output power limit value of the power of the detection, the inverter current output power and the inverter calculates the target of the inverter
Power.
In one embodiment, if the electricity consumption period is the second electricity consumption period, which changes for controlling this
It flows device and is charged using the power grid with the maximum charge power that the energy-storage module allows for the energy-storage module.
In one embodiment, which includes energy-storage battery and DC-DC converter, the DC/DC
Converter connects the energy-storage battery and the DC terminal of the inverter.The control module is used to control the DC-DC converter will
The first voltage of energy-storage battery output is converted to second voltage, and the second voltage is input to the DC terminal of the inverter,
And it controls the DC-DC converter and the first charging voltage that the DC terminal of the inverter exports is converted into the second charging electricity
Pressure, and will be energy-storage battery charging using second charging voltage.
In one embodiment, which includes photovoltaic panel and photovoltaic DC-to-AC converter, the output of the photovoltaic panel
End connects the input terminal of the photovoltaic DC-to-AC converter, and the output end of the photovoltaic DC-to-AC converter is connected to exchange end and power grid of the inverter
Between.
A kind of control method of photovoltaic energy storage micro-grid system, the photovoltaic energy storage micro-grid system include photovoltaic mould group, energy storage mould
Block, control module and inverter, the control module connect the energy-storage module and the inverter, which connects the inverter
DC terminal, the output end of the photovoltaic mould group is connected between the exchange end of the inverter and power grid, what which generated
Electric energy inputs the power grid and/or is load supplying.The control method of the photovoltaic energy storage micro-grid system the following steps are included:
S1: the control module judges the electricity consumption period, if the electricity consumption period was the first electricity consumption period, enters step S2, if should
The electricity consumption period was the second electricity consumption period, entered step S3；.
S2: when the electricity abundance of the energy-storage module, it is to be somebody's turn to do which, which controls the energy-storage module by the inverter,
Load supplying, when the not enough power supply of the energy-storage module, which controls the energy-storage module and stops being the load supplying；
S3: it is energy-storage module charging that the control module, which controls the inverter using the power grid,.
In one embodiment, in step s 2, it is the inverter which, which is the discharge power of the load supplying,
Target power and the energy-storage module discharge power limit value in smaller.
In one embodiment, which includes power monitoring module, which connects
It connects between the exchange end of the inverter and the output end of the photovoltaic mould group, which connects the power monitoring module.Step
Rapid S2 includes: the power that the control module acquires power monitoring module detection, and is worked as according to the power of the detection, the inverter
The output power limit value of preceding output power and the inverter calculates the target power of the inverter.
In one embodiment, step S3 includes: that the control module controls the inverter using the power grid with the energy storage
The maximum charge power that module allows is energy-storage module charging.
In one embodiment, which includes energy-storage battery and DC-DC converter, the DC/DC
Converter connects the energy-storage battery and the DC terminal of the inverter.Step S2 includes: that the control module controls the DC/DC turn
The first voltage that the energy-storage battery exports is converted to second voltage by parallel operation, and the second voltage is input to the straight of the inverter
Flow end.Step S3 includes: that the control module controls the DC-DC converter exports the DC terminal of the inverter first and fills
Piezoelectric voltage is converted to the second charging voltage, and will be energy-storage battery charging using second charging voltage.
Additional aspect and advantage of the invention will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect and advantage of the invention is from combining in description of the following accompanying drawings to embodiment by change
It obtains obviously and is readily appreciated that, in which:
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.
Specific embodiment
Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the accompanying drawings, wherein from beginning extremely
Same or similar label indicates same or similar element or element with the same or similar functions eventually.Below with reference to
The embodiment of attached drawing description is exemplary, and for explaining only the invention, and is not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width
Degree ", " thickness ", " go up ", " under ", " preceding ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " bottom ", " interior ", " outside ", "
Clockwise ", " counterclockwise " wait the orientation or positional relationship of instructions to be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second " are only
For descriptive purposes, it is not understood to indicate or imply relative importance or implicitly indicates the number of indicated technical characteristic
Amount." first " is defined as a result, the feature of " second " can explicitly or implicitly include one or more of the features.
In the description of the present invention, " multiple " are meant that two or more, unless otherwise specifically defined.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected or can mutually communicate；It can be directly connected, it can also be by between intermediary
It connects connected, can be the connection inside two elements or the interaction relationship of two elements.For the ordinary skill of this field
For personnel, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature second feature its " upper " or it " under "
It may include that the first and second features directly contact, also may include that the first and second features are not direct contacts but pass through it
Between other characterisation contact.Moreover, fisrt feature second feature " on ", " top " and " above " include first spy
Sign is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.Fisrt feature exists
Second feature " under ", " lower section " and it is " following " including fisrt feature right above second feature and oblique upper, or be merely representative of
First feature horizontal height is less than second feature.
Following disclosure provides many different embodiments or example is used to realize different structure of the invention.In order to
Simplify disclosure of the invention, hereinafter the component of specific examples and setting are described.Certainly, they are merely examples, and
And it is not intended to limit the present invention.In addition, the present invention can in different examples repeat reference numerals and/or reference letter,
This repetition is for purposes of simplicity and clarity, itself not indicate between discussed various embodiments and/or setting
Relationship.In addition, the present invention provides various specific techniques and material example, but those of ordinary skill in the art can be with
Recognize the application of other techniques and/or the use of other materials.
It please join Fig. 1, photovoltaic energy storage microgrid (micro grid) system 100 that better embodiment of the present invention provides includes light
Fu Mo group 102, energy-storage module 104, control module 106 and inverter 108.
The control module 106 connects the energy-storage module 104 and the inverter 108, which connects the inverter
The output end of 108 DC terminal, the photovoltaic mould group 102 is connected between the exchange end of the inverter 108 and power grid 400, the light
The electric energy that Fu Mo group 102 generates inputs the power grid 400 and/or powers for load 500.In present embodiment, load 500 is connected to
Between exchange end and the output end of the photovoltaic mould group 102 of inverter 108.
Specifically, photovoltaic mould group 102 includes photovoltaic panel 110 and photovoltaic DC-to-AC converter 112, the output of the photovoltaic panel 110
The input terminal of the end connection photovoltaic DC-to-AC converter 112, output end of the output end of the photovoltaic DC-to-AC converter 112 as photovoltaic mould group 102,
It is connected between the exchange end of the inverter 108 and power grid.
Photovoltaic panel 110 may be provided at outdoor and sun-drenched place, to convert the solar into electric energy.Photovoltaic panel
110 include that multiple photovoltaic cells are interconnected and formed, and those skilled in the art institute can be selected in the photoelectric conversion material of photovoltaic panel 110
The material known, preferably, selecting photoelectric conversion material of the higher photoelectric conversion material of transfer efficiency as photovoltaic panel 110
Material.
The electric energy that the photovoltaic panel 110 generates is to input the power grid 400 and to load 500 power supplies, or input power grid
400, or it is 500 power supply of load, depend on the power that the power of load 500 and photovoltaic mould group 102 export.If photovoltaic mould group 102
The power of output is greater than the power of load 500, then electric energy a part that photovoltaic mould group 102 generates is 500 power supply of load, another portion
Divide input power grid 400.
If load 500 does not work, the electric energy that photovoltaic mould group 102 generates inputs power grid 400.
If the power that photovoltaic mould group 102 exports is less than or equal to the power of load 500, the electricity that photovoltaic mould group 102 generates
It can be 500 power supply of load, in addition, power grid 400 is also negative when the power that photovoltaic mould group 102 exports is less than the power of load 500
500 power supplies are carried, the insufficient electric energy of photovoltaic mould group 102 is supplemented.
If photovoltaic mould group 102 does not export electric energy, power grid 400 is 500 power supply of load.A point i.e. shown in Fig. 1 meets
Kirchhoff's law, so that the adaptive different situation of photovoltaic mould group 102.
DC bus of the output bus of energy-storage module 104 as photovoltaic energy storage micro-grid system 100.In present embodiment,
Preferably, the energy-storage module 104 include energy-storage battery 114 and DC-DC converter 116 (DC/DC converter), the direct current/
Direct current transducer 116 connects the energy-storage battery 114 and the DC terminal of the inverter 108.
The control module 106 is used to control the first electricity that the DC-DC converter 116 exports the energy-storage battery 114
Pressure is converted to second voltage, and the second voltage is input to the DC terminal of the inverter 108, and controls the DC/DC and turn
The first charging voltage that the DC terminal of the inverter 108 exports is converted to the second charging voltage by parallel operation 108, and will using this
Two charging voltages are the energy-storage battery 114 charging.
Therefore, when the output voltage amplitude to energy-storage battery 114 requires, control module 106 can be by direct current/straight
Stream transformer 116 is lifted the output voltage of energy-storage battery 114 with DC voltage needed for meeting inverter 108.Similarly, in order to
Meet the charging or electric power storage demand of energy-storage battery 114, DC-DC converter 116 supports the operation of Bidirectional charging-discharging.Other
In embodiment, energy-storage module 104 can be individually for energy-storage battery, can omit DC-DC converter.
Inverter 108 can be DC/AC power inverter (DC/AC inverter), be two-way inverter, inverter 108
DC terminal connect with the output bus of energy-storage module 104, the exchange end of inverter 108 and load 500, photovoltaic DC-to-AC converter 112
Output end and power grid 400 connect.Inverter 108 may operate under constant power-mode, the target issued according to control module 106
Power output power.In order to meet the charging or electric power storage demand of energy-storage battery 114, inverter 108 supports the operation of the two-way change of current.
In addition, single-phase, three-phase or double fire wire etc. can be can choose no according to the difference of power grid 400 wiring and user demand, inverter 108
Same type.And according to hardware cost and user demand, inverter 108 can choose the differences such as two level, three level or single-phase H bridge
Hardware topology.
In present embodiment, which includes power monitoring module 118, the power monitoring module
118 are connected between the exchange end of the inverter 108 and the output end of the photovoltaic mould group 102, which connects the function
Rate monitoring modular 118.
The power monitoring module 118 is to (i.e. light between inverter 108, load 500 and power grid 400, photovoltaic DC-to-AC converter 112
Between volt inverter 112 and load 400) power monitored that and the power information that will test is sent to control module
106.The power monitoring module 118 can be dedicated power monitoring apparatus, which directly passes power information
It send to control module 106.The power monitoring module 118 is also possible to electric current and voltage sensor, and electric current, information of voltage are sent to
Corresponding power is calculated by control module 106 after control module 106.In present embodiment, power monitoring module 118 is with power grid stream
It is positive to the power of load.
Therefore, control module 106 can acquire the power of the power monitoring module 118 detection, accordingly to be controlled.
Control module 106 can be separately connected energy-storage module 104 (such as energy-storage battery and DC/DC conversion by communication line
Device), inverter 108 and power monitoring module 118.It can according to need using cable, CAN line or Serial Port Line as communication line.
If power monitoring module 118 uses electric current and voltage sensor, communication line uses corresponding sensor connecting line.
Control module 106 be responsible for modules in photovoltaic energy storage micro-grid system 100, device and equipment control, scheduling and
Information forwarding.Control module 106 receives the operating parameter of modules, device and equipment, and information is summarized, and is respectively used to light
Lie prostrate the operations such as the start and stop, the control of photovoltaic greatest benefit, the processing of outbound data of energy storage micro-grid system 100.According to actual needs, it controls
The function of molding block 106 can integrate in inverter 108 or other control unit, be also possible to one it is independent
Control module or equipment.
The control module 106 is for judging the electricity consumption period.In present embodiment, the electricity consumption period was provided with for the first electricity consumption period
And the second electricity consumption period.First electricity consumption period can be peak of power consumption period or high rate period, and the second electricity consumption period can be electricity consumption
Low-valley interval or low rate period.The setting of electricity consumption period can be preset in control module 106, and control module 106 can be from timing
Module (not shown) acquisition time.Timing module can be integrated with control module 106 or an individual timing mould
Block.Peak of power consumption period or high rate period and low power consumption period or low rate period can be inquired to local electrical supplier with more
Adapt to actual conditions.In addition, settable different peak of power consumption period in different seasons or high rate period and different use
Electric low-valley interval or low rate period.
If the electricity consumption period was the first electricity consumption period, when the electricity abundance of the energy-storage module 104, the control module 106
It is 500 power supply of load for controlling the energy-storage module 104 by the inverter 108, when the not enough power supply of the energy-storage module 104
When, which stops being that the load 500 is powered for controlling the energy-storage module 104.For example, control module 106 is controllable
Inverter 108 processed is closed, and energy-storage module 104 is made to stop output electric energy.
In this case, if there is load 500 is opened, then, load 500 will be by photovoltaic mould group 102 and/or power grid
400 power supplies.Particular situation can join the above-mentioned explanation adaptive about photovoltaic mould group 102.
Therefore, control module 106 controls inverter 108 and (supplies in peak of power consumption period or the electric discharge of high rate period for load
Electricity), power grid 400 is alleviated in the peak of power consumption period and uses Voltage force, is played the role of peak clipping and is reduced the electric cost of user.
Specifically, in the present embodiment, control module 106 can acquire the battery dump energy of energy-storage module 104
(state of charge, SOC) is to judge whether the electricity of energy-storage module 104 is sufficient.For example, controlling mould when the 5% of SOC
Block 106 judges that the electricity of energy-storage module 104 is sufficient, and as SOC < 5%, control module 106 judges the electricity of energy-storage module 104
It is insufficient.
The load 500 powered by energy-storage module 104 can be low-power load, for example, load of the power within several kilowatts
500 are powered by energy-storage module 104.
The inverter 108 is that the discharge power of the load 500 power supply is the target power and the energy storage mould of the inverter 108
Smaller in the discharge power limit value of block 104.
It specifically, is first 500 power supply of load by photovoltaic mould group 102 and/or power grid 400 when loading 500 just unlatching.This
When, power P which detects according to power monitoring module 1181(such as with the side of the flow direction of power grid 400 load 500
To being positive), the current output power P of the inverter 108dcacAnd the output power limit value P of the inverter 108b(such as with power grid
The directions of 400 flow direction loads 500 are positive) calculate the target power P of the inverter 108objtemp.When load 500 is just opened, this is changed
Flow the current output power P of device 108dcacIt is zero.
The power P that power monitoring module 118 detects1The output power P current with the inverter 108dcacAnd to be supplied to
The power P of load 500L, i.e. bearing power PL=P1+Pdcac。
Control module 106 is according to bearing power P laterLWith the output power limit value P of inverter 108bCalculate inverter 108
Target power Pobjtemp(such as being positive with the direction of the flow direction of inverter 108 load 500), Pobjtemp=PL-Pb.Inverter 108
Output power limit value PbIt can be set according to actual user's electricity consumption situation, typically equal to or greater than the power of user's important load
Value, or the performance number of agreement, such as 5 kilowatts.
Control module 106 is by the target power P for the inverter 108 being calculatedobjtempAllow with current energy-storage module 104
Discharge power limit value PLimitIt is compared, if PobjtempWithin the scope of the discharge power that energy-storage module 104 allows, then mould is controlled
Block 106 is by the target power P of inverter 108objtempThe discharge power P final as inverter 108obj；If PobjtempBeyond storage
Can be within the scope of the discharge power that allows of module 104, then control module 106 allows energy-storage module 104 discharge power limit value
PLimitThe discharge power P final as inverter 108obj.In this way, energy-storage module 104 can be protected and keep photovoltaic energy storage micro-
The discharge power of net system 100 maximizes.
In addition, energy-storage module 104 is 500 power supply of load, so that photovoltaic mould group 102 does not have to for 500 power supply of load or reduces
Electric energy for 500 power supply of load alleviates power grid so that the electric energy that photovoltaic mould group 102 generates more inputs power grid 400
400, in peak of power consumption period or the use Voltage force of high rate period, play the role of part peak clipping, while could be used that family
Benefit.
If the electricity consumption period was the second electricity consumption period, which utilizes the power grid for controlling the inverter 108
400 charge for the energy-storage module 104, and the second electricity consumption period was different from for the first electricity consumption period.
Specifically, the second electricity consumption period was low power consumption period or low rate period, for example, control module 106 is controllable
Inverter 108 exports electric energy from the exchange end inputing power of inverter 108, and from the DC terminal of inverter 108.At this point, by storing up
Energy module 104 is in charged state, and therefore, load 500 can be powered by power grid 400 and/or photovoltaic mould group 102.
Preferably, control module 106 is for controlling the inverter 108 using the power grid 400 with the energy-storage module 104 permission
Maximum charge power be the energy-storage module 104 charging.In this way, can quickly charge for energy-storage battery 114, while will not
Damage energy-storage battery 114.
After the electricity of energy-storage battery 114 is full of, control module 106 controls the inverter 108 and stops being energy-storage module 104
Charging.In addition, control module 106 also stops charging for energy-storage module 104 when the time exceeding the low power consumption period.Further
Ground, in order to guarantee that the electricity of energy-storage battery 114 can be full of, can adjust according to the actual situation the low power consumption period it is specific when
Between.
Since the electricity price of power grid 400 is relatively inexpensive in the low power consumption period, so inverter 108 is energy storage in low power consumption
Battery 114 charges, and plays valley-fill effect, and pass through electricity price official post user's maximizing the benefits of peak load shifting.
In conclusion the electric energy that photovoltaic mould group 102 generates inputs the power grid 400 in above-mentioned photovoltaic energy storage micro-grid system 100
And/or be 500 power supply of load, it is able to use family maximizing the benefits, in the first electricity consumption period, such as peak of power consumption period or high electricity price
Period, control module 106 are first that load supplying can be by light when the not enough power supply of energy-storage module 104 by energy-storage module 104
Fu Mo group 102 and/or power grid 400 are 500 power supply of load, play the role of peak clipping and reduce the electric cost of user.?
Two electricity consumption periods, such as low power consumption period or low rate period, control module 106 is that energy-storage module 104 fills using power grid 400
Electricity, so that 104 electric energy supplement of energy-storage module, plays the electric cost of valley-fill effect and reduction user.
Therefore, above-mentioned photovoltaic energy storage micro-grid system 100 alleviate 400 peak of power consumption of power grid with Voltage force simultaneously, pass through
The electricity price of peak load shifting poor (electricity price when electricity price when low power consumption is than peak of power consumption is low) and photovoltaic power generation make user's benefit most
Bigization.
It please join Fig. 2, better embodiment of the present invention provides a kind of control method of photovoltaic energy storage micro-grid system.The controlling party
Method can be realized by the photovoltaic energy storage micro-grid system 100 of embodiment of above.The control method of the photovoltaic energy storage micro-grid system includes
Following steps:
S1: the control module 106 judges the electricity consumption period, if the electricity consumption period was the first electricity consumption period, enters step S2, if
The electricity consumption period was the second electricity consumption period, entered step S3；.
S2: when the electricity abundance of the energy-storage module 104, which controls the energy-storage module 104 and is changed by this
Device 108 is flowed for the load 500 power supply, and when the not enough power supply of the energy-storage module 104, which controls the energy storage mould
Block 104 stops being that the load 500 is powered；
S3: it is the energy-storage module 104 charging that the control module 106, which controls the inverter 108 using the power grid 400,.
In step S1, present embodiment, the electricity consumption period is provided with the first electricity consumption period and the second electricity consumption period.First uses
The electric period can be the peak of power consumption period on daytime, and the second electricity consumption period can be the low power consumption period in evening.The electricity consumption period sets
Setting can be preset in control module 106, and control module 106 can be from timing module (not shown) acquisition time.Timing module can be with
It is integrated with control module 106 or an individual timing module.
In step s 2, in the present embodiment, control module 106 can acquire the battery dump energy of energy-storage module 104
(state of charge, SOC) is to judge whether the electricity of energy-storage module 104 is sufficient.For example, controlling mould when the 5% of SOC
Block 106 judges that the electricity of energy-storage module 104 is sufficient, and as SOC < 5%, control module 106 judges the electricity of energy-storage module 104
It is insufficient.
The inverter 108 is that the discharge power of the load 500 power supply is the target power and the energy storage mould of the inverter 108
Smaller in the discharge power limit value of block 104.
Step S2 includes: the power that the control module 106 acquires the power monitoring module 118 detection, and according to the detection
Power, the current output power and the inverter 108 of the inverter 108 output power limit value calculate the inverter 108
Target power.
It specifically, is first 500 power supply of load by photovoltaic mould group 102 and/or power grid 400 when loading 500 just unlatching.This
When, power P which detects according to power monitoring module 1181(such as with the side of the flow direction of power grid 400 load 500
To being positive), the current output power P of the inverter 108dcacAnd the output power limit value P of the inverter 108b(such as with power grid
The directions of 400 flow direction loads 500 are positive) calculate the target power P of the inverter 108objtemp.When load 500 is just opened, this is changed
Flow the current output power P of device 108dcacIt is zero.
The power P that power monitoring module 118 detects1The output power P current with the inverter 108dcacAnd to be supplied to
The power P of load 500L, i.e. bearing power PL=P1+Pdcac。
Control module 106 is according to bearing power P laterLWith the output power limit value P of inverter 108bCalculate inverter 108
Target power Pobjtemp(such as being positive with the direction of the flow direction of inverter 108 load 500), Pobjtemp=PL-Pb.Inverter 108
Output power limit value PbIt can be set according to actual user's electricity consumption situation, typically equal to or greater than the power of user's important load
Value, or the performance number of agreement, such as 5 kilowatts.
Control module 106 is by the target power P for the inverter 108 being calculatedobjtempAllow with current energy-storage module 104
Discharge power limit value PLimitIt is compared, if PobjtempWithin the scope of the discharge power that energy-storage module 104 allows, then mould is controlled
Block 106 is by the target power P of inverter 108objtempThe discharge power P final as inverter 108obj；If PobjtempBeyond storage
Can be within the scope of the discharge power that allows of module 104, then control module 106 allows energy-storage module 104 discharge power limit value
PLimitThe discharge power P final as inverter 108obj.In this way, energy-storage module 104 can be protected and keep photovoltaic energy storage micro-
The discharge power of net system 100 maximizes.
In addition, energy-storage module 104 is 500 power supply of load, so that photovoltaic mould group 102 does not have to for 500 power supply of load or reduces
Electric energy for 500 power supply of load alleviates power grid so that the electric energy that photovoltaic mould group 102 generates more inputs power grid 400
400 use Voltage force in the peak of power consumption period, play the role of part peak clipping.
Further, if require to the output voltage amplitude of energy-storage battery 114, step S2 includes: the control module
106, which control the DC-DC converter 116, is converted to second voltage for the first voltage that the energy-storage battery 114 exports, and should
Second voltage is input to the DC terminal of the inverter 108.Therefore, control module 106 can pass through DC-DC converter 116
The output voltage of energy-storage battery 114 is lifted with DC voltage needed for meeting inverter 108.
In step s3, control module 106 can control exchange end inputing power of the inverter 108 from inverter 108, and from
The DC terminal of inverter 108 exports electric energy.At this point, being in charged state by energy-storage module 104, therefore, load 500 can be by power grid
400 and/or photovoltaic mould group 102 power.
Preferably, step S3 includes: that control module 106 controls the inverter 108 using the power grid 400 with the energy-storage module
104 maximum charge powers allowed are the energy-storage module 104 charging.In this way, can quickly charge for energy-storage battery 114, together
When will not damage energy-storage battery 114.
After the electricity of energy-storage battery 114 is full of, control module 106 controls the inverter 108 and stops being energy-storage module 104
Charging.In addition, control module 106 also stops charging for energy-storage module 104 when the time exceeding the low power consumption period.Further
Ground, in order to guarantee that the electricity of energy-storage battery 114 can be full of, can adjust according to the actual situation the low power consumption period it is specific when
Between.
Since the electricity price of power grid 400 is relatively inexpensive in the low power consumption period, so inverter 108 is energy storage in low power consumption
Battery 114 charges, and plays valley-fill effect, and pass through electricity price official post user's maximizing the benefits of peak load shifting.
Further, if the charging voltage amplitude to energy-storage battery 114 requires, step S3 includes: the control module
The first charging voltage that the DC terminal of the inverter 108 exports is converted to second by 106 control DC-DC converters 116
Charging voltage, and will be that the energy-storage battery 114 charges using second charging voltage.
In conclusion the electric energy input that photovoltaic mould group 102 generates should in the control method of above-mentioned photovoltaic energy storage micro-grid system
Power grid 400 and/or for load 500 power supply, family maximizing the benefits is able to use, in the first electricity consumption period, such as the peak of power consumption period
Or high rate period, control module 106 first by energy-storage module 104 be load 500 power supply, when energy-storage module 104 electricity not
When sufficient, it can be 500 power supply of load by photovoltaic mould group 102 and/or power grid 400, play the role of peak clipping and reduce the use of user
Electric cost.In the second electricity consumption period, such as low power consumption period or low rate period, control module 106 is energy storage using power grid 400
Module 104 charges, so that 104 electric energy supplement of energy-storage module, plays the electric cost of valley-fill effect and reduction user.
In the description of this specification, reference term " embodiment ", " some embodiments ", " schematically implementation
The description of mode ", " example ", " specific example " or " some examples " etc. means the tool for combining the embodiment or example to describe
Body characteristics, structure, material or feature are contained at least one embodiment or example of the invention.In the present specification,
Schematic expression of the above terms are not necessarily referring to identical embodiment or example.Moreover, the specific features of description, knot
Structure, material or feature can be combined in any suitable manner in any one or more embodiments or example.
While embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that:
These embodiments can be carried out with a variety of variations, modification, replacement in the case where not departing from the principle of the present invention and objective and become
Type, the scope of the present invention are defined by the claims and their equivalents.
Claims (7)
1. a kind of photovoltaic energy storage micro-grid system, which is characterized in that including photovoltaic mould group, energy-storage module, control module and inverter,
The control module connects the energy-storage module and the inverter, which connects the DC terminal of the inverter, the photovoltaic mould group
Output end be connected between the exchange end of the inverter and power grid, the photovoltaic mould group generate electric energy input the power grid and/or
For load supplying；
The control module is for judging the electricity consumption period, if the electricity consumption period was the first electricity consumption period, when the electricity of the energy-storage module
When sufficient, which is the load supplying for controlling the energy-storage module by the inverter, when the electricity of the energy-storage module
When amount is insufficient, which stops being the load supplying for controlling the energy-storage module；
If the electricity consumption period was the second electricity consumption period, which is the energy storage mould for controlling the inverter using the power grid
Block charging, the second electricity consumption period are different from the first electricity consumption period；
The inverter is that the discharge power of the load supplying is the target power of the inverter and the discharge power of the energy-storage module
Smaller in limit value；
The photovoltaic energy storage micro-grid system includes power monitoring module, the power monitoring module be connected to the inverter exchange end and
Between the output end of the photovoltaic mould group, which connects the power monitoring module；
If the electricity consumption period is the first electricity consumption period, which is used to acquire the power of power monitoring module detection,
And the inverter is calculated according to the output power limit value of the power of the detection, the inverter current output power and the inverter
Target power.
2. photovoltaic energy storage micro-grid system as described in claim 1, which is characterized in that if the electricity consumption period is second electricity consumption
Section, it is the energy storage which, which is used to control the maximum charge power that the inverter is allowed using the power grid with the energy-storage module,
Module charging.
3. photovoltaic energy storage micro-grid system as described in claim 1, which is characterized in that the energy-storage module includes energy-storage battery and straight
Stream/direct current transducer, the DC-DC converter connect the energy-storage battery and the DC terminal of the inverter；
The first voltage that the energy-storage battery exports is converted to the second electricity for controlling the DC-DC converter by the control module
It presses, and the second voltage is input to the DC terminal of the inverter, and control the DC-DC converter for the straight of the inverter
First charging voltage of stream end output is converted to the second charging voltage, and will be that the energy-storage battery is filled using second charging voltage
Electricity.
4. photovoltaic energy storage micro-grid system as described in claim 1, which is characterized in that the photovoltaic mould group includes photovoltaic panel and light
Inverter is lied prostrate, the output end of the photovoltaic panel connects the input terminal of the photovoltaic DC-to-AC converter, the output end connection of the photovoltaic DC-to-AC converter
Between the exchange end and the power grid of the inverter.
5. a kind of control method of photovoltaic energy storage micro-grid system, the photovoltaic energy storage micro-grid system include photovoltaic mould group, energy-storage module,
Control module and inverter, the control module connect the energy-storage module and the inverter, which connects the inverter
The output end of DC terminal, the photovoltaic mould group is connected between the exchange end of the inverter and power grid, the electricity which generates
The power grid can be inputted and/or for load supplying；
It is characterized in that, the control method of the photovoltaic energy storage micro-grid system the following steps are included:
S1: the control module judges the electricity consumption period, if the electricity consumption period was the first electricity consumption period, S2 is entered step, if the electricity consumption
Period was the second electricity consumption period, entered step S3；
S2: when the electricity abundance of the energy-storage module, it is the load which, which controls the energy-storage module by the inverter,
Power supply, when the not enough power supply of the energy-storage module, which controls the energy-storage module and stops being the load supplying；
S3: it is energy-storage module charging that the control module, which controls the inverter using the power grid,；
In step s 2, which is the target power and the energy-storage module that the discharge power of the load supplying is the inverter
Discharge power limit value in smaller；
The photovoltaic energy storage micro-grid system includes power monitoring module, the power monitoring module be connected to the inverter exchange end and
Between the output end of the photovoltaic mould group, which connects the power monitoring module；
Step S2 includes: the power that the control module acquires power monitoring module detection, and according to the power of the detection, this changes
The output power limit value of stream device current output power and the inverter calculates the target power of the inverter.
6. the control method of photovoltaic energy storage micro-grid system as claimed in claim 5, which is characterized in that step S3 includes: the control
Molding block is controlled the inverter and is charged using the power grid with the maximum charge power that the energy-storage module allows for the energy-storage module.
7. the control method of photovoltaic energy storage micro-grid system as claimed in claim 5, which is characterized in that the energy-storage module includes storage
Energy battery and DC-DC converter, the DC-DC converter connect the energy-storage battery and the DC terminal of the inverter；
Step S2 includes: that the control module controls the first voltage conversion that the DC-DC converter exports the energy-storage battery
For second voltage, and the second voltage is input to the DC terminal of the inverter；
Step S3 includes: that the control module controls the DC-DC converter exports the DC terminal of the inverter first and fills
Piezoelectric voltage is converted to the second charging voltage, and will be energy-storage battery charging using second charging voltage.
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| CN107222013B (en) * | 2017-07-03 | 2019-08-23 | 太原理工大学 | Independent photovoltaic mixed energy storage system energy control method |
| CN107359636B (en) * | 2017-07-24 | 2020-06-23 | 国网山东省电力公司青岛供电公司 | Charging system |
| CN107332278A (en) * | 2017-08-25 | 2017-11-07 | 浙江南都电源动力股份有限公司 | Light storing cogeneration system |
| CN112193113B (en) * | 2019-06-06 | 2021-11-26 | 厦门市福工动力技术有限公司 | Intelligent power supply method of high-power charging device for electric vehicle |
| CN110518688A (en) * | 2019-07-11 | 2019-11-29 | 深圳市华宝新能源股份有限公司 | A kind of caravan power control method and caravan power control |
| CN113922369A (en) * | 2021-10-11 | 2022-01-11 | 国网河北省电力有限公司经济技术研究院 | Method, terminal and storage medium for reliability evaluation of transmission and distribution network |
| CN114865780B (en) * | 2022-07-06 | 2022-12-27 | 广东电网有限责任公司佛山供电局 | New energy power supply system |
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