CN108964081B - Circuit structure applied to stabilizing output of micro-grid energy storage system - Google Patents
Circuit structure applied to stabilizing output of micro-grid energy storage system Download PDFInfo
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- CN108964081B CN108964081B CN201810549670.7A CN201810549670A CN108964081B CN 108964081 B CN108964081 B CN 108964081B CN 201810549670 A CN201810549670 A CN 201810549670A CN 108964081 B CN108964081 B CN 108964081B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 39
- 230000000087 stabilizing effect Effects 0.000 title claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims abstract description 36
- 238000007599 discharging Methods 0.000 abstract description 5
- 238000010248 power generation Methods 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 8
- 230000007704 transition Effects 0.000 description 4
- 230000004075 alteration Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 210000000352 storage cell Anatomy 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H02J3/383—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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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
Abstract
The invention relates to a circuit structure applied to stabilizing output of a micro-grid energy storage system. The circuit comprises an inductor L, a capacitor C, a resistor R, a photovoltaic panel PV, a super capacitor (U)UC、RUC) A storage battery (U)b、Rb) Four diodes (D1, D2, D3 and D4) and four switching tubes (M1, M2, M3 and M4). The circuit provided by the invention is connected in series to work in a microgrid, when an energy storage battery is in a charging state, the switching tubes M2 and M3 are cut off, the switching tubes M1 and M4 are conducted, and a photovoltaic power generation system and the power grid charge the energy storage system. When the energy storage battery is in a discharging state, the switching tubes M2 and M3 are switched on, the switching tubes M1 and M4 are switched off, and the energy storage system discharges to the load. Compared with the traditional micro-grid energy storage system, the photovoltaic grid energy storage system has high response speed, can stabilize the output fluctuation of the photovoltaic cell caused by environmental change, and can further stabilize the sudden change of the bus power caused by load change.
Description
Technical Field
The invention belongs to the technical field of micro-grid energy storage, and particularly relates to an H-bridge DC-DC converter structure.
Background
The photovoltaic power generation is seriously influenced by the environment, the generated energy is low in cloudy days and at night, and the photovoltaic power generation can not continuously supply power to a load. In addition, when sudden load power changes are large in the micro-grid, the bus voltage and current cannot be quickly and effectively stabilized by using only the transient action of the super capacitor. Therefore, in order to prevent the direct current bus current from rapidly decreasing due to the above problems and ensure the output power of the system to be stable, measures are required to rapidly and effectively reduce or suppress power fluctuation.
The conventional method adopts a super capacitor and a storage battery which are connected in parallel to inhibit current fluctuation, but the super capacitor is limited by the capacity and the reaction time and cannot completely meet the requirement of stable current of large fluctuation of a load. At present, the application of a DC-DC converter in the power electronic technology is more and more extensive, and a proper converter is added into a system, so that the output of voltage and current can be effectively stabilized by utilizing the buffering action of an inductor, a capacitor and a switching tube in a converter circuit.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a circuit structure applied to stabilizing the output of a microgrid energy storage system aiming at the requirement of quickly recovering bus current when the power of a microgrid suddenly changes.
In order to achieve the purpose, the invention adopts the technical scheme that:
a circuit structure applied to stabilizing output of a micro-grid energy storage system comprises an inductor L, a capacitor C, a resistor R, a photovoltaic panel PV, a super capacitor and a capacitor UUCAnd RUCOne storage battery comprises a UbAnd RbFour diodes D1, D2, D3, D4, four switch tubes M1, M2, M3, M4, its characterized in that:
(1) photovoltaic panel PV and super capacitor UUCAnd RUCAre connected in parallel;
(2) photovoltaic panel PV and storage battery UbAnd RbAre connected in parallel;
(3) the photovoltaic panel PV is connected with the switching tube M1 and the switching tube M2 in parallel;
(4) the switching tube M1 is connected in parallel with the diode D1; the switching tube M2 is connected in parallel with the diode D2; the switching tube M3 is connected in parallel with the diode D3; the switching tube M4 is connected in parallel with the diode D4;
(5) the capacitor C is connected with the resistor R in parallel;
(6) the switch tube M1 and the switch tube M2 are connected with the inductor L in a star shape; the other end of the inductor L is connected with the anode of the capacitor C;
(7) the positive electrode of the capacitor C is connected with the inductor L, and the negative electrode of the capacitor C is connected with the switch tube M3 and the switch tube M4 in a star shape.
Further, the circuit is connected in parallel with the direct current bus.
Further, when the energy storage battery is in a charging state, the bus voltage is greater than the two-stage voltage of the storage battery and the super capacitor, so the switching tubes M2 and M3 are cut off, the switching tubes M1 and M4 are switched on, the photovoltaic power generation system and the power grid charge the energy storage system, and the control parameters of the switching tube M1 meet:
in the above formula, IHESSIs the amount of current stored in the hybrid energy storage system; k is a radical ofa、kbIs an adjustable parameter based on the transition period of the current of the energy storage battery.
Further, when the energy storage battery is in a discharging state, the bus voltage is less than the two-stage voltage of the storage battery and the super capacitor, so the switching tubes M2 and M3 are switched on, the switching tubes M1 and M4 are switched off, the energy storage system discharges to the load, and the control parameters of the switching tube M3 meet:
in the above formula, IHESSIs the amount of current stored in the hybrid energy storage system; k is a radical ofa、kbIs an adjustable parameter based on the transition period of the current of the energy storage battery.
Further, when the energy storage battery is in a standby state, the bus voltage is between the charging voltage and the discharging voltage, at the moment, a hybrid energy storage system consisting of a super capacitor and a storage battery is not needed for supplying power to a load, and in order to keep current circulation, two working conditions exist at the moment: (1) m1 is turned on, M4 is turned off, and a loop is formed by the freewheeling diodes of M1 and M3, and the state is before the next conduction period of M4; (2) m3 is turned on, M2 is turned off, and the freewheeling diodes of M3 and M1 form a loop, and the state is before the next conduction period of M2.
Compared with the prior art, the invention has the following advantages: (1) when the output voltage of the photovoltaic cell is unstable, the circuit can adjust the bus voltage through the conduction and the disconnection of the energy storage cell and a switching tube of the converter, and the normal power supply of a load is not influenced; (2) when the load suddenly changes, the invention can quickly stabilize the bus current by controlling the on and off of the corresponding switch tube in the converter so as to stabilize the power fluctuation of the bus.
Drawings
FIG. 1 is a schematic diagram of a circuit topology according to the present invention.
Fig. 2 is an equivalent circuit diagram of the circuit of the present invention when charging an energy storage battery.
Fig. 3 is an equivalent circuit diagram of the circuit energy storage battery of the invention when supplying power to a load.
Fig. 4 is an equivalent circuit diagram of the circuit of the present invention in standby.
Detailed Description
The present invention will be described in further detail with reference to examples for the purpose of facilitating understanding and practice of the invention by those of ordinary skill in the art, and it is to be understood that the present invention has been described in the illustrative embodiments and is not to be construed as limited thereto.
FIG. 1 is a schematic diagram of a circuit topology of the present invention, which mainly includes an inductor L, a capacitor C, a resistor R, a photovoltaic panel PV, and a super capacitor (U)UC、RUC) A storage battery (U)b、Rb) Fig. 1 shows the connection relationship among the elements, four diodes (D1, D2, D3, D4), four switching tubes (M1, M2, M3, M4). Wherein:
(1) photovoltaic panel PV and super capacitor UUCAnd RUCAre connected in parallel;
(2) photovoltaic panel PV and storage battery UbAnd RbAre connected in parallel;
(3) the photovoltaic panel PV is connected with the switching tube M1 and the switching tube M2 in parallel;
(4) the switching tube M1 is connected in parallel with the diode D1; the switching tube M2 is connected in parallel with the diode D2; the switching tube M3 is connected in parallel with the diode D3; the switching tube M4 is connected in parallel with the diode D4;
(5) the capacitor C is connected with the resistor R in parallel;
(6) the switch tube M1 and the switch tube M2 are connected with the inductor L in a star shape; the other end of the inductor L is connected with the anode of the capacitor C;
(7) the positive electrode of the capacitor C is connected with the inductor L, and the negative electrode of the capacitor C is connected with the switch tube M3 and the switch tube M4 in a star shape.
The circuit is connected in parallel with the direct current bus.
When the energy storage battery is in a charging state, the bus voltage is greater than the two-section voltage of the storage battery and the super capacitor, so that the switching tubes M2 and M3 are cut off, the switching tubes M1 and M4 are conducted, and the photovoltaic power generation system and the power grid charge the energy storage system. The control parameters of the switching tube M1 meet the following conditions:
in the above formula, IHESSIs the amount of current stored in the hybrid energy storage system; k is a radical ofa、kbIs an adjustable parameter based on the transition period of the current of the energy storage battery.
When the energy storage battery is in a discharging state, the bus voltage is less than the two-section voltage of the storage battery and the super capacitor, so the switching tubes M2 and M3 are switched on, the switching tubes M1 and M4 are switched off, and the energy storage system discharges to the load. The control parameters of the switching tube M3 meet the following conditions:
in the above formula, IHESSIs the amount of current stored in the hybrid energy storage system; k is a radical ofa、kbIs an adjustable parameter based on the transition period of the current of the energy storage battery.
When the energy storage battery is in a standby state, the bus voltage is between the charging voltage and the discharging voltage, the hybrid energy storage system formed by the super capacitor and the storage battery is not needed to supply power to the load, and in order to keep current circulation, two working conditions exist at the moment: (1) m1 is turned on, M4 is turned off, and the freewheeling diodes of M1 and M3 form a loop. This state is before the next conduction cycle of M4; (2) m2 is turned on, M3 is turned off, and the freewheeling diodes of M2 and M4 form a loop. This state is before the next on cycle of M3.
Fig. 2 is an equivalent circuit diagram of the circuit of the present invention when charging an energy storage battery. At this time, the switches M2 and M3 in fig. 1 are turned off, and the switches M1 and M4 are turned on, and the present invention is equivalent to the structure shown in fig. 2.
Fig. 3 is an equivalent circuit diagram of the circuit energy storage battery of the invention when supplying power to a load. At this time, the switches M1 and M4 in fig. 1 are turned off, and the switches M2 and M3 are turned on, and the present invention is equivalent to the structure shown in fig. 3.
Fig. 4 is an equivalent circuit diagram of the circuit of the present invention in standby. There are two working situations at this time: (1) m1 in FIG. 1 is turned on, M4 is turned off, and freewheeling diodes of M1 and M3 form a loop. This state is before the next conduction cycle of M4; (2) m2 in FIG. 1 is turned on, M3 is turned off, and freewheeling diodes of M2 and M4 form a loop. This state is before the next on cycle of M3. The present invention can be equivalent to the structure shown in fig. 4(a) (b).
It should be understood that parts of the specification not set forth in detail are well within the prior art.
It should be understood that the above description of the preferred embodiments is given for clarity and not for any purpose of limitation, and that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (2)
1. A circuit structure applied to stabilizing output of a micro-grid energy storage system comprises an inductor L, a capacitor C, a resistor R, a photovoltaic panel PV, a super capacitor and a capacitor UUCAnd RUCOne storage battery comprises a UbAnd RbFour diodes D1, D2, D3, D4, four switch tubes M1, M2, M3, M4, its characterized in that:
(1) photovoltaic panel PV and super capacitor UUCAnd RUCAre connected in parallel;
(2) photovoltaic panel PV and storage battery UbAnd RbAre connected in parallel;
(3) the photovoltaic panel PV is connected with the switching tube M1 and the switching tube M2 in parallel; the photovoltaic panel PV is sequentially connected with the storage battery, the switching tube circuit and the super capacitor in parallel;
(4) the switching tube M1 is connected in parallel with the diode D1; the switching tube M2 is connected in parallel with the diode D2; the switching tube M3 is connected in parallel with the diode D3; the switching tube M4 is connected in parallel with the diode D4;
(5) the capacitor C is connected with the resistor R in parallel;
(6) after the switching tubes M1 and M2 are connected in series, the switching tubes M1 and M2 are connected in parallel with the direct current bus, and the switching tube M1 and the switching tube M2 are connected with the inductor L in a star shape; the other end of the inductor L is connected with the anode of the capacitor C;
(7) after the switching tubes M3 and M4 are connected in series, the switching tubes are connected with the direct current bus in parallel, the positive electrode of the capacitor C is connected with the inductor L, and the negative electrode of the capacitor C is connected with the switching tube M3 and the switching tube M4 in a star shape.
2. The circuit structure applied to stabilize the output of the microgrid energy storage system of claim 1, wherein: the circuit is connected in parallel with the direct current bus.
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| CN108964081B true CN108964081B (en) | 2022-01-04 |
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| CN109733223A (en) * | 2019-01-14 | 2019-05-10 | 南京航空航天大学 | A kind of assisted charging system and its control method |
| CN216252243U (en) * | 2022-02-22 | 2022-04-08 | 广州疆海科技有限公司 | PV charging circuit capable of outputting DC voltage source in reversible way |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895198A (en) * | 2010-06-18 | 2010-11-24 | 华南理工大学 | Current feed three-inductor boost converter of high frequency transformer connected in delta/Y shape |
| CN102064702A (en) * | 2010-12-31 | 2011-05-18 | 刘闯 | Bidirectionally isolating type series resonance DC/DC converter |
| CN103236747A (en) * | 2013-04-25 | 2013-08-07 | 华北电力大学（保定） | Photovoltaic power supply hybrid energy storage system |
| CN103248234A (en) * | 2013-04-26 | 2013-08-14 | 上海交通大学 | Control method applied to bidirectional isolation full-bridge current transformer for battery energy storage |
| CN106026164A (en) * | 2016-06-16 | 2016-10-12 | 上海电机学院 | Photovoltaic power generation system with energy storage apparatus |
| CN107401720A (en) * | 2017-06-22 | 2017-11-28 | 芜湖纯元光电设备技术有限公司 | One kind carries stand-by power supply solar LED street lamp |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010088545A2 (en) * | 2009-01-30 | 2010-08-05 | Board Of Regents, The University Of Texas System | Methods and apparatus for design and control of multi-port power electronic interface for renewable energy sources |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895198A (en) * | 2010-06-18 | 2010-11-24 | 华南理工大学 | Current feed three-inductor boost converter of high frequency transformer connected in delta/Y shape |
| CN102064702A (en) * | 2010-12-31 | 2011-05-18 | 刘闯 | Bidirectionally isolating type series resonance DC/DC converter |
| CN103236747A (en) * | 2013-04-25 | 2013-08-07 | 华北电力大学（保定） | Photovoltaic power supply hybrid energy storage system |
| CN103248234A (en) * | 2013-04-26 | 2013-08-14 | 上海交通大学 | Control method applied to bidirectional isolation full-bridge current transformer for battery energy storage |
| CN106026164A (en) * | 2016-06-16 | 2016-10-12 | 上海电机学院 | Photovoltaic power generation system with energy storage apparatus |
| CN107401720A (en) * | 2017-06-22 | 2017-11-28 | 芜湖纯元光电设备技术有限公司 | One kind carries stand-by power supply solar LED street lamp |
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