CN209250259U - A kind of micro-grid system - Google Patents

A kind of micro-grid system Download PDF

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Publication number
CN209250259U
CN209250259U CN201920114398.XU CN201920114398U CN209250259U CN 209250259 U CN209250259 U CN 209250259U CN 201920114398 U CN201920114398 U CN 201920114398U CN 209250259 U CN209250259 U CN 209250259U
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micro
current transformer
grid system
rechargeable battery
voltage
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曹磊
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China Architecture Design and Research Group Co Ltd
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China Architecture Design and Research Group Co Ltd
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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
    • 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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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The utility model relates to a kind of micro-grid systems, belong to micro-capacitance sensor technical field, solve the problems, such as that existing photovoltaic power generation can not be directly for load and grid-connected use because of the unstable electric energy for causing to generate that generates electricity.A kind of micro-grid system, including photovoltaic array, voltage changer, rechargeable battery, DC/AC current transformer；The voltage changer includes DC/DC booster converter, DC/DC step-down transformer and control switching circuit；When photovoltaic array output voltage is higher than reference voltage, the control switching circuit control DC/DC step-down converter work, otherwise, control DC/DC step-up transformer work；The photovoltaic array output voltage carries out the charging end of access rechargeable battery after boost or depressurization by the DC/DC booster converter or DC/DC step-down transformer；The output end of the rechargeable battery is connect with the DC side of the DC/AC current transformer；The exchange side of the DC/AC current transformer is for connecting load.Improve the stability and reliability of photovoltaic power supply.

Description

A kind of micro-grid system
Technical field
The utility model relates to micro-capacitance sensor technical field more particularly to a kind of micro-grid systems.
Background technique
In recent years, photovoltaic power generation is grown rapidly in China, and photovoltaic power generation quantity accounts for the specific gravity of whole world power generation total amount It rises year by year, photovoltaic power generation consumption market has a high potential.
Photovoltaic power generation is very widely used, on the one hand can carry out photovoltaic power generation by household roof, photovoltaic power generation is produced Raw electric energy is directly used for the load in family；On the other hand, large-sized photovoltaic generator can convert a large amount of solar energy It for electric energy, can be used for grid-connected use, current energy shortage situation be effectively relieved.
But since photovoltaic power generation itself has jiggly problem that generates electricity, the electric energy that photovoltaic power generation generates can not be direct It is used for load, it is even more impossible to be directly incorporated into power grid, it is necessary to pass through respective handling, after obtaining stable, reliable alternating current, ability For load and grid-connected use.
Utility model content
In view of above-mentioned analysis, the utility model is intended to provide a kind of micro-grid system, to solve existing photovoltaic power generation Unstable cause the electric energy generated can not be directly for load and the problem of grid-connected use because generating electricity.
The purpose of this utility model is mainly achieved through the following technical solutions:
A kind of micro-grid system, including photovoltaic array, voltage changer, rechargeable battery, DC/AC current transformer；
The voltage changer includes DC/DC booster converter, DC/DC step-down transformer and control switching circuit；When When photovoltaic array output voltage is higher than reference voltage, the control switching circuit control DC/DC step-down converter work, otherwise, Control the work of DC/DC step-up transformer；
The photovoltaic array output voltage is boosted by the DC/DC booster converter or DC/DC step-down transformer Or the charging end of rechargeable battery is accessed after decompression；The DC side of the output end of the rechargeable battery and the DC/AC current transformer connects It connects；
The exchange side of the DC/AC current transformer is for connecting load.
The utility model has the beneficial effect that: boosting or reduced pressure operation should be carried out using control switching circuit judgement, Then it is by the unstable DC conversion that DC/DC step-down converter or DC/DC booster converter export photovoltaic array Then DC conversion is alternating current by DC/AC current transformer, for negative by direct current stable, for rechargeable battery storage Equipment is carried to use.The unstable constant voltage for exporting photovoltaic array only can be realized by hardware without any software in the system It is converted into for loading the stable alternating current used, the stable operation of load end is effectively ensured, improves the benefit of photovoltaic power generation With rate.
On the basis of above scheme, the utility model has also done following improvement:
Further, the control switching circuit includes voltage sensor, comparator, NOT gate, NPN type triode Q1, NPN type Triode Q2, resistance R1, resistance R2；
The voltage sensor for acquiring the output voltage of photovoltaic array, and the output voltage is input to described The non-inverting input terminal of comparator；The inverting input terminal of the comparator is for inputting scheduled reference voltage；
The output end of the comparator is connected with the base stage of the NPN type triode Q1, the hair of the NPN type triode Q1 Emitter grounding；The collector of the NPN type triode Q1 is connected with the control terminal of the DC/DC step-down converter, and passes through electricity Resistance R1 is connected with power supply；
The output end of the comparator is also connected by the NOT gate with the base stage of the NPN type triode Q2, the NPN The emitter of type triode Q2 is grounded；The control terminal of the collector of the NPN type triode Q2 and the DC/DC booster converter It is connected, and is connected by resistance R2 with power supply.
Beneficial effect using above-mentioned further scheme is: after being converted solar energy into electrical energy using photovoltaic array, needing Electric energy after conversion is stored, judges to need to be implemented boosting or reduced pressure operation in advance using control switching circuit, it can The requirements of type selecting to DC/DC current transformer is reduced, while DC/DC extends the service life of current transformer.
It further, further include LC filter and high-speed switch, the exchange side of the DC/AC current transformer is filtered by the LC High-speed switch is connected after device, the load is public electric wire net or individual loads, and different loads is gated using the high-speed switch.
Further, the scheduled reference voltage value is the DC voltage value of rechargeable battery storage.
Further, the DC/AC current transformer is used for inverter operation, the direct current electricity output that the rechargeable battery exports to institute The DC side for stating DC/AC current transformer is converted into alternating current by the DC/AC current transformer, uses for load.
Further, the input terminal of the rechargeable battery is also connect with the DC side of the DC/AC current transformer.
Further, the DC/AC current transformer, is also used to rectify operation, is direct current by the AC conversion of load-side, leads to The DC side of the DC/AC current transformer is crossed as rechargeable battery charging.
Further, the DC/DC booster converter is BOOST booster circuit.
Further, the DC/DC step-down converter is BUCK reduction voltage circuit.
Further, the DC/AC current transformer is H bridge or three-phase half-bridge circuit.
It in the utility model, can also be combined with each other between above-mentioned each technical solution, to realize more preferably combination sides Case.Other feature and advantage of the utility model will illustrate in the following description, also, certain advantages can be from specification It becomes apparent, or is understood and implementing the utility model.The purpose of this utility model and other advantages can pass through It is achieved and obtained in specifically noted content in bright book, claims and attached drawing.
Detailed description of the invention
Attached drawing is only used for showing the purpose of specific embodiment, and is not considered as limitations of the present invention, entire In attached drawing, identical reference symbol indicates identical component.
Fig. 1 is the micro-grid system structural block diagram in the utility model embodiment；
Fig. 2 is the micro-grid system schematic diagram in the utility model embodiment.
Specific embodiment
Specifically describe the preferred embodiment of the utility model with reference to the accompanying drawing, wherein attached drawing constitutes the application one Point, and be used to illustrate the principles of the present invention together with the embodiments of the present invention, it is not intended to limit the utility model Range.
One specific embodiment of the utility model, discloses a kind of micro-grid system, and structural block diagram is as shown in Figure 1, packet Include photovoltaic array, voltage changer, rechargeable battery, DC/AC current transformer；
The voltage changer includes DC/DC booster converter, DC/DC step-down transformer and control switching circuit；When When photovoltaic array output voltage is higher than reference voltage, the control switching circuit control DC/DC step-down converter work, otherwise, Control the work of DC/DC booster converter；
The photovoltaic array output voltage is boosted by the DC/DC booster converter or DC/DC step-down transformer Or the charging end of rechargeable battery is accessed after decompression；The DC side of the output end of the rechargeable battery and the DC/AC current transformer connects It connects；
The exchange side of the DC/AC current transformer is for connecting load.
Compared with prior art, micro-grid system provided in this embodiment should be carried out using control switching circuit judgement Boosting or reduced pressure operation, the shakiness for then being exported photovoltaic array by DC/DC step-down converter or DC/DC booster converter Fixed DC conversion is direct current stable, for rechargeable battery storage, is then turned direct current by DC/AC current transformer Alternating current is turned to, is used for load equipment.The system only can be realized by hardware photovoltaic array is defeated without any software Unstable constant voltage out is converted into load the stable alternating current used, and the stable operation of load end is effectively ensured, is promoted The utilization rate of photovoltaic power generation.
Preferably, it after converting solar energy into electrical energy using photovoltaic array, needs to store the electric energy after conversion, benefit Judged to need to be implemented boosting or reduced pressure operation in advance with control switching circuit, can reduce and the type selecting of DC/DC current transformer is wanted It asks, while DC/DC extends the service life of current transformer.In the utility model, the function of switching control passes through control switching circuit It realizes, as shown in Fig. 2, specific control switching circuit is provided that
The control switching circuit includes voltage sensor, comparator, NOT gate, NPN type triode Q1, NPN type triode Q2, resistance R1, resistance R2；
The voltage sensor for acquiring the output voltage of photovoltaic array, and the output voltage is input to described The non-inverting input terminal of comparator；The inverting input terminal of the comparator is for inputting scheduled reference voltage；
The output end of the comparator is connected with the base stage of the NPN type triode Q1, the hair of the NPN type triode Q1 Emitter grounding；The collector of the NPN type triode Q1 is connected with the control terminal of the DC/DC step-down converter, and passes through electricity Resistance R1 is connected with power supply；
The output end of the comparator is also connected by the NOT gate with the base stage of the NPN type triode Q2, the NPN The emitter of type triode Q2 is grounded；The control terminal of the collector of the NPN type triode Q2 and the DC/DC booster converter It is connected, and is connected by resistance R2 with power supply.
Boosting unsteady flow or drop can be realized using the combination of conventional device in the control switching circuit being arranged in the utility model The handoff functionality of buckling stream, for whole process without any software, circuit structure is simple, and each device sensitivity is high, response Fastly, the accuracy and real-time that can effectively ensure that output result meet micro-grid system and real-time and accuracy are wanted It asks, has high reliability.
In actual application, if not in advance by the voltage and the permitted DC voltage of rechargeable battery of photovoltaic array output It being compared, selected current transformer needs are provided simultaneously with boosting unsteady flow and decompression unsteady flow function, and the requirement to current transformer is higher, Cost is higher.In the utility model, carried out by the permitted DC voltage of voltage and rechargeable battery for exporting photovoltaic array Compare, judgement needs to be implemented boost operations or reduced pressure operation, and then selects corresponding booster converter or step-down converter, has Effect reduces the requirements of type selecting of current transformer, reduces the hardware cost of entire micro-grid system.Based on described above, control switching circuit In, the inverting input terminal of the comparator is used to input the DC voltage that scheduled reference voltage is rechargeable battery storage Value.
It preferably, is the stability for further enhancing alternating current, the micro-grid system further includes LC filter, described The exchange side of DC/AC current transformer is connected by the LC filter, is smoothly filtered using alternating current of the LC filter to output Wave enhances the stability of exported alternating current, improves the utilization rate of photovoltaic power generation.
It preferably, is the use scope for further enhancing micro-grid system designed by the utility model, the micro-capacitance sensor System is also provided with high-speed switch, and the high-speed switch includes multiple independent switches, and different switches connects different loads, The exchange side of the DC/AC current transformer connects high-speed switch after passing through the LC filter, not using high-speed switch gating Same load, the load are the other kinds of load that public electric wire net or individual loads or alternating current can control.
Multiple loads for gating are connected by the fast high-speed switch of handoff response, improve being applicable in for photovoltaic power generation electric energy Property, different scenes can be suitable for.
Preferably, it when the load of high-speed switch connection is individual loads, needs to provide battery to it by rechargeable battery, DC/AC current transformer is used for inverter operation, the direct current electricity output that the rechargeable battery is exported to the DC/AC current transformer at this time DC side is converted into alternating current by the DC/AC current transformer, uses for load.
In practical application, when the load of high-speed switch connection is active load, it there is also electricity and pass through DC/AC unsteady flow The case where device flows back to rechargeable battery, therefore, it is also desirable to which micro-grid system is arranged as follows:
Preferably, the input terminal of the rechargeable battery is also connect with the DC side of the DC/AC current transformer.
The AC conversion of load-side is direct current, by described for rectifying operation by the DC/AC current transformer at this time The DC side of DC/AC current transformer is rechargeable battery charging.
Preferably, the DC/DC booster converter is BOOST booster circuit；The DC/DC step-down converter is BUCK drop Volt circuit.
Preferably, the DC/AC current transformer is H bridge or three-phase half-bridge circuit, can be realized the two-way flow of energy, according to Loading condition makes DC/AC current transformer inverter operation or rectification operation, can satisfy the requirement of various loads.
The type and capacity of rechargeable battery are selected according to actual application scenarios:
The rechargeable battery can be battery, lithium ion battery, plumbic acid/carbon battery or flow battery, also can choose Other kinds of rechargeable battery；
The Capacity Selection of rechargeable battery depends on the maximum overcast and rainy days of longest power off time and the local sun.
Micro-grid system in the utility model can carry out flexible configuration to photovoltaic power generation and charged battery capacity, according to Grid condition, load state, environmental aspect and photovoltaic array situation, flexibly control the operational mode of entire micro-grid system, Realize the operation of more efficient stable.
The utility model is not related to the improvement of any software aspects.The utility model only needs to have corresponding function for each Device be attached by connection relationship given by the utility model embodiment, wherein it is soft to be not related to any program Improvement in terms of part.And as the connection type between the hardware device of each corresponding function, it is that those skilled in the art can With what is realized using the prior art, do not elaborate herein.
The preferable specific embodiment of the above, only the utility model, but the protection scope of the utility model is not It is confined to this, anyone skilled in the art within the technical scope disclosed by the utility model, can readily occur in Change or replacement, should be covered within the scope of the utility model.

Claims (10)

1. a kind of micro-grid system, which is characterized in that including photovoltaic array, voltage changer, rechargeable battery, DC/AC unsteady flow Device；
The voltage changer includes DC/DC booster converter, DC/DC step-down transformer and control switching circuit；Work as photovoltaic When array output voltage is higher than reference voltage, the control switching circuit control DC/DC step-down converter work, otherwise, control The work of DC/DC step-up transformer；
The photovoltaic array output voltage is boosted or is dropped by the DC/DC booster converter or DC/DC step-down transformer The charging end of rechargeable battery is accessed after pressure；The output end of the rechargeable battery is connect with the DC side of the DC/AC current transformer；
The exchange side of the DC/AC current transformer is for connecting load.
2. micro-grid system according to claim 1, which is characterized in that the control switching circuit includes voltage sensor Device, comparator, NOT gate, NPN type triode Q1, NPN type triode Q2, resistance R1, resistance R2；
The voltage sensor is input to the comparison for acquiring the output voltage of photovoltaic array, and by the output voltage The non-inverting input terminal of device；The inverting input terminal of the comparator is for inputting scheduled reference voltage；
The output end of the comparator is connected with the base stage of the NPN type triode Q1, the emitter of the NPN type triode Q1 Ground connection；The collector of the NPN type triode Q1 is connected with the control terminal of the DC/DC step-down converter, and passes through resistance R1 It is connected with power supply；
The output end of the comparator is also connected by the NOT gate with the base stage of the NPN type triode Q2, the NPN type three The emitter of pole pipe Q2 is grounded；The control terminal phase of the collector of the NPN type triode Q2 and the DC/DC booster converter Even, and by resistance R2 it is connected with power supply.
3. micro-grid system according to claim 1, which is characterized in that it further include LC filter and high-speed switch, it is described The exchange side of DC/AC current transformer connects high-speed switch after passing through the LC filter, and the load is public electric wire net or independently bears It carries, different loads is gated using the high-speed switch.
4. micro-grid system according to claim 2, which is characterized in that the scheduled reference voltage value is the charging The DC voltage value of battery storage.
5. micro-grid system according to claim 4, which is characterized in that the DC/AC current transformer is used for inverter operation, The direct current electricity output of the rechargeable battery output is converted to the DC side of the DC/AC current transformer by the DC/AC current transformer For alternating current, used for load.
6. micro-grid system according to any one of claims 1-5, which is characterized in that the input terminal of the rechargeable battery Also it is connect with the DC side of the DC/AC current transformer.
7. micro-grid system according to claim 6, which is characterized in that the DC/AC current transformer is also used to rectify fortune The AC conversion of load-side is direct current by row, and the DC side by the DC/AC current transformer is that the rechargeable battery fills Electricity.
8. micro-grid system according to claim 7, which is characterized in that the DC/DC booster converter is BOOST boosting Circuit.
9. micro-grid system according to claim 7 or 8, which is characterized in that the DC/DC step-down converter is BUCK drop Volt circuit.
10. micro-grid system according to claim 9, which is characterized in that the DC/AC current transformer is H bridge or three-phase half Bridge circuit.
CN201920114398.XU 2019-01-23 2019-01-23 A kind of micro-grid system Active CN209250259U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920114398.XU CN209250259U (en) 2019-01-23 2019-01-23 A kind of micro-grid system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920114398.XU CN209250259U (en) 2019-01-23 2019-01-23 A kind of micro-grid system

Publications (1)

Publication Number Publication Date
CN209250259U true CN209250259U (en) 2019-08-13

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