CN110289599B - Voltage equalizing protection circuit, flow battery energy storage system and use method - Google Patents
Voltage equalizing protection circuit, flow battery energy storage system and use method Download PDFInfo
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- CN110289599B CN110289599B CN201910410174.8A CN201910410174A CN110289599B CN 110289599 B CN110289599 B CN 110289599B CN 201910410174 A CN201910410174 A CN 201910410174A CN 110289599 B CN110289599 B CN 110289599B
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- flow battery
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- equalizing
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- 238000004146 energy storage Methods 0.000 title claims description 16
- 238000000034 method Methods 0.000 title claims description 11
- 102100037070 Doublecortin domain-containing protein 2 Human genes 0.000 description 28
- 101000954709 Homo sapiens Doublecortin domain-containing protein 2 Proteins 0.000 description 28
- 238000010586 diagram Methods 0.000 description 11
- 102100037069 Doublecortin domain-containing protein 1 Human genes 0.000 description 6
- 101000954712 Homo sapiens Doublecortin domain-containing protein 1 Proteins 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
-
- 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
- H02J15/00—Systems for storing electric energy
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Fuel Cell (AREA)
- Protection Of Static Devices (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a voltage-equalizing protection circuit, which is arranged in a direct-current converter, wherein a first end of the direct-current converter is connected with a flow battery, a second end of the direct-current converter is connected with a converter, and the voltage-equalizing protection circuit comprises: the first end of the first equalizing resistor is connected with the anode of the flow battery; the first end of the second equalizing resistor is connected with the negative electrode of the flow battery; the first end of the grounding resistor is respectively connected with the second ends of the first voltage equalizing resistor and the second voltage equalizing resistor, and the first end of the grounding resistor receives the reference voltage; wherein the DC converter controls connection to the flow battery in response to the magnitude of the voltage across the ground resistor. The invention solves the problem that the voltage of the positive electrode to the ground and the voltage of the negative electrode to the ground of the flow battery generated by poor contact between the equalizing resistor and the flow battery can not be detected, and improves the safety of the flow battery.
Description
Technical Field
The invention relates to the technical field of semiconductors, in particular to a voltage equalizing protection circuit, a flow battery energy storage system and a use method.
Background
In the existing flow battery energy storage system, the voltages of the positive electrode and the negative electrode of the flow battery must be equal, a currently adopted voltage equalizing circuit for the positive electrode to the ground and the negative electrode to the ground is shown in fig. 1, fig. 1 shows 2 sets of flow batteries B (in fig. 1, the flow batteries B1 and B2 are collectively called as flow batteries B), in fig. 1, a voltage equalizing protection circuit R1 is positioned in a direct current converter DCDC1, an input end of the direct current converter DCDC1 is connected with the flow battery B, and an output end of the direct current converter DCDC1 is connected with a converter DCAC1; the equalizing protection circuit R1 comprises an equalizing resistor R11 and an equalizing resistor R12, wherein the equalizing resistor R11 and the equalizing resistor R12 are connected in series and respectively connected with the positive electrode and the negative electrode of the flow battery B, and the middle of the equalizing protection circuit is grounded; the equivalent circuit is shown in fig. 2.
Taking fig. 2 as an example, the operation of the flow battery according to 2 sets will be described. During normal operation, 2 sets of flow batteries are charged and discharged simultaneously, the terminal voltage of the flow battery B1 is U1, the terminal voltage of the flow battery B2 is U2, and then the positive electrode voltage to ground U1 P, the ground voltage to negative electrode voltage U1 N of the flow battery B1 and the pressure difference between the two are U1 ΔPN. The positive electrode voltage to ground U2 P, the ground to negative electrode voltage U2 N and the differential pressure between the two of the flow battery B2 are that the absolute values of U2 ΔPN.U1ΔPN＝-U2ΔPN,U1ΔPN and U2 ΔPN are increased along with the increase of the absolute value of the difference value between U1 and U2; only when u1=u2, u1 ΔPN＝U2ΔPN =0.
As shown in fig. 1, during normal operation, the 2 dc converters DCDC1 collect terminal voltages of the two flow batteries B1 and B2, the two terminal voltages are uploaded to the converter DCAC1, the converter DCAC1 determines a difference value of the two voltages, and when the difference value of the voltages is greater than a set voltage protection value, a shutdown command is sent to the 2 dc converters DCDC1, and the dc converters DCDC1 are shut down to disconnect from the flow battery B, so as to protect the flow battery B.
When the voltages on the two flow batteries (B) are equal, u1=u2, but any one of the equalizing resistor R11 or the equalizing resistor R12 on the equalizing protection circuit R1 has poor contact with the positive electrode of the flow battery B or the negative electrode of the flow battery B, the formulas U1 ΔPN and U2 ΔPN are not equal to 0 any more, at this time, the voltages of the positive electrode and the ground of the two flow batteries B are biased to the voltage of the negative electrode, and are not equal any more, and the measurement circuit cannot measure the voltages, and cannot perform shutdown protection.
Therefore, it is desirable to provide a voltage equalizing protection circuit, a flow battery energy storage system and a use method thereof, so as to satisfy the deviation between the positive electrode voltage to ground and the ground voltage to negative electrode voltage of the flow battery generated when the voltage equalizing resistor is in poor contact, and the deviation can be measured so as to perform shutdown protection.
Disclosure of Invention
In order to achieve the above object, a first aspect of the present invention provides a voltage equalizing protection circuit, the voltage equalizing protection circuit is disposed in a dc converter, a first end of the dc converter is connected to a flow battery, a second end of the dc converter is connected to a converter, the voltage equalizing protection circuit includes:
the first end of the first equalizing resistor is connected with the anode of the flow battery;
the first end of the second equalizing resistor is connected with the negative electrode of the flow battery;
the first end of the grounding resistor is connected with the second ends of the first voltage equalizing resistor and the second voltage equalizing resistor respectively, and the first end of the grounding resistor receives a reference voltage;
wherein the DC converter controls connection with the flow battery in response to a magnitude of a voltage across the ground resistor.
Preferably, the dc converter measures the voltage across the ground resistor, compares the voltage with a preset voltage value, and further controls connection with the flow battery according to the comparison result.
Preferably, the direct current converter is controlled to be disconnected from the flow battery in response to the voltage across the grounding resistor being greater than the preset voltage value.
A second aspect of the present invention provides a flow battery energy storage system, comprising:
a flow battery;
a DC converter with a first end connected with the flow battery;
the voltage equalizing protection circuit is arranged in the direct current converter; and
And the converter is connected with the second end of the direct current converter.
A third aspect of the present invention provides a method for using the liquid flow current storage system, comprising the steps of:
The DC converter controls connection to the flow battery in response to a magnitude of voltage across the ground resistor.
Preferably, the dc converter measures the voltage across the ground resistor, compares the voltage with a preset voltage value, and further controls connection with the flow battery according to the comparison result.
Preferably, the direct current converter is controlled to be disconnected from the flow battery in response to the voltage across the grounding resistor being greater than the preset voltage value.
The beneficial effects of the invention are as follows:
the scheme provided by the invention has the advantages of clear principle and simple design, solves the problems that the positive electrode voltage to ground and the ground voltage to negative electrode voltage of the flow battery are biased and cannot be detected due to poor contact between the equalizing resistor and the flow battery, and improves the safety of the flow battery.
Drawings
The following describes the embodiments of the present invention in further detail with reference to the drawings.
FIG. 1 illustrates a schematic diagram of a prior art flow battery energy storage system;
fig. 2 shows an equivalent circuit diagram of fig. 1;
FIG. 3 illustrates a schematic diagram of a flow battery energy storage system in accordance with one embodiment of the present invention;
fig. 4 shows an equivalent circuit diagram of fig. 3;
fig. 5 shows a schematic diagram of a flow battery energy storage system in the present embodiment when a contact failure occurs;
fig. 6 shows an equivalent circuit diagram of fig. 5.
Fig. 7 is a schematic diagram of a method for using the energy storage system of the flow battery according to an embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the present invention, the present invention will be further described with reference to preferred embodiments and the accompanying drawings. Like parts in the drawings are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this invention is not limited to the details given herein.
To solve the technical problem set forth in the background art, a first embodiment of the present invention provides a voltage equalizing protection circuit, where the voltage equalizing protection circuit R2 is disposed in a dc converter DCDC2, a first end of the dc converter DCDC2 is connected to a flow battery B, and a second end of the dc converter DCDC2 is connected to a converter DCAC2.
Further, the voltage equalizing protection circuit R2 includes:
The first end of the first equalizing resistor R21 is connected with the anode of the flow battery B;
the first end of the second equalizing resistor R22 is connected with the negative electrode of the flow battery B;
The first end of the grounding resistor R23 is respectively connected with the second ends of the first equalizing resistor R21 and the second equalizing resistor R22, and the first end of the grounding resistor R23 receives a reference voltage.
Here, the dc converter DCDC2 controls the connection to the flow battery B in response to the magnitude of the voltage across the ground resistor R23, thereby cutting off the protection effect on the flow battery B.
Further, the dc converter DCDC2 measures the voltage at two ends of the grounding resistor R23, compares the voltage with a preset voltage value, and further controls the connection with the flow battery B according to the comparison result.
Specifically, the dc converter DCDC2 can measure the voltage at two ends of the ground resistor R23 in real time, and send the measurement result to the converter DCAC2, where the converter DCDC2 compares the preset voltage value with the measured voltage, and sends a control command to the dc converter DCDC2 according to the comparison result to control the connection between the dc converter DCDC2 and the flow battery B, where the preset voltage value can be set by the user, and the specific numerical value of the invention is not limited in this way.
Further, the dc converter DCDC2 is controlled to disconnect from the flow battery B in response to the voltage across the grounding resistor R23 being greater than the preset voltage value.
Specifically, when the voltage of the two ends of the grounding resistor R23 measured by the dc converter DCDC2 is greater than a preset voltage value, the converter DCAC2 sends a control command to the dc converter DCDC2, so that the dc converter DCDC2 is disconnected from the flow battery B based on the control command, so as to achieve the effect of protecting the flow battery B.
Fig. 3 shows a schematic diagram of a flow battery energy storage system according to a first embodiment of the present invention, as shown in fig. 3, where the system includes: flow battery B (in fig. 3, flow battery B1 and flow battery B2 are collectively referred to as flow battery B), dc converter DCDC2 having a first end connected to flow battery B, voltage equalizing protection circuit R2 provided in dc converter DCDC2, and converter DCAC2 connected to dc converter DCDC 2.
It should be noted that, in the example of fig. 3, two sets of flow batteries B are included, each set of flow batteries B is sequentially connected to a dc converter DCDC2 and a converter DCAC2, and each dc converter DCDC2 includes a voltage equalizing protection circuit R2.
Specifically, when the flow battery energy storage system shown in fig. 3 is used for voltage equalizing protection, the dc converters DCDC2 in each set of flow battery B can measure the voltage at two ends of the grounding resistor R23 arranged inside the flow battery B, and when the voltage on the grounding resistor R23 is greater than a preset voltage value, the dc converters DCDC2 are stopped to disconnect from the flow battery B, so as to protect the flow battery.
It should be noted that, in the specific example of fig. 3, the first terminal of R23 is grounded, i.e., the reference voltage is 0. Those skilled in the art will appreciate that the reference voltage is not limited thereto.
Further, fig. 4 shows an equivalent circuit diagram of fig. 3, as shown in fig. 4, the description is given by that 2 sets of flow batteries B work simultaneously, in normal operation, 2 sets of flow batteries B are simultaneously charged and discharged, the voltage at two ends of the flow battery B1 is U1, the voltage at two ends of the flow battery B2 is U2, then the voltage on the grounding resistor R23 of the flow battery B1 is U1 R23, and the absolute value of the voltages on the grounding resistor R23 of the flow battery B2 is U2 R23,U1R23＝-U2R23,U1R23 and U2 R23 increases with the increase of the absolute value of the difference value between U1 and U2; u1 R23＝U2R23 =0 only when u1=u2; during normal operation, the voltage of the grounding resistor R23 arranged inside the 2 direct current converters DCDC2 is measured respectively, and when the voltage of the grounding resistor R23 is larger than a preset voltage value, the direct current converters DCDC2 are stopped to disconnect the connection with the flow battery B, so that the flow battery B is protected.
Fig. 5 is a schematic diagram illustrating a case where a poor contact occurs in the flow battery energy storage system in this embodiment, similarly to fig. 3, fig. 5 also includes two sets of flow batteries B (in fig. 5, the flow battery B1 and the flow battery B2 are collectively referred to as flow battery B)), and in fig. 5, a first end of a first voltage equalizing resistor R21 in a dc converter DCDC2 connected to one set of flow batteries B is in virtual connection with a positive electrode of the flow battery B, that is, a poor contact occurs between the first voltage equalizing resistor R23 and the flow battery B.
Specifically, when the flow battery energy storage system shown in fig. 5 is used for voltage equalizing protection, the dc converters DCDC2 in each set of flow battery B can measure the voltage at two ends of the grounding resistor R23 arranged inside the flow battery B, and when the voltage on the grounding resistor R23 is greater than a preset voltage value, the dc converters DCDC2 are stopped to disconnect from the flow battery B, so as to protect the flow battery.
Further, fig. 6 illustrates an equivalent circuit diagram of fig. 5, and further illustrates the embodiment with reference to fig. 5 and 6, in normal operation, 2 sets of flow batteries B are co-charged and discharged, the voltage at two ends of the flow battery B1 is U1, the voltage at two ends of the flow battery B2 is U2, the voltage at the grounding resistor R23 of the flow battery B1 is U1 R23, the voltage at the grounding resistor R23 of the flow battery B2 is U2 R23,U1R23＝-U2R23, and at this time, the absolute values of U1 R23 and U2 R23 are not increased with the increase of the absolute value of the difference between U1 and U2, but are changed with the change of the value of U2; when u1=u2, at this time, U1 R23＝-U2R23 is no longer 0, that is, when the contact of the equalizing resistor R23 is poor, it can be detected, so that the dc converter DCDC2 stops to disconnect from the flow battery B, and the flow battery B is protected.
In summary, the solution provided by the embodiment has the advantages of clear principle and simple design, solves the problems that the positive electrode voltage to ground and the ground voltage to negative electrode voltage of the flow battery are biased and cannot be detected due to poor contact between the equalizing resistor and the flow battery, and improves the safety of the flow battery.
Fig. 7 shows a method for using the flow current storage system according to the third embodiment of the present invention, as shown in fig. 7, the method includes the following steps:
the direct current converter DCDC2 controls the connection with the flow battery B in response to the magnitude of the voltage across the ground resistor R23.
Further, the dc converter DCDC2 measures the voltage at two ends of the grounding resistor R23, compares the voltage with a preset voltage value, and further controls the connection with the flow battery B according to the comparison result.
Further, the dc converter DCDC2 is controlled to disconnect from the flow battery B in response to the voltage across the grounding resistor R23 being greater than the preset voltage value.
It should be understood that the foregoing examples of the present invention are provided merely for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention, and that various other changes and modifications may be made therein by one skilled in the art without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (7)
1. The utility model provides a voltage-sharing protection circuit, voltage-sharing protection circuit sets up in DC converter, flow battery is connected to DC converter's first end, current transformer is connected to DC converter's second end, its characterized in that, voltage-sharing protection circuit includes:
the first end of the first equalizing resistor is connected with the anode of the flow battery;
the first end of the second equalizing resistor is connected with the negative electrode of the flow battery;
The first end of the grounding resistor is connected with the second ends of the first voltage equalizing resistor and the second voltage equalizing resistor respectively, and the first end of the grounding resistor receives a reference voltage which is half of the voltage of the flow battery;
wherein the DC converter controls connection with the flow battery in response to a magnitude of a voltage across the ground resistor.
2. The voltage equalizing protection circuit according to claim 1, wherein the dc converter measures a voltage across the ground resistor, compares the voltage with a preset voltage value, and further controls connection with the flow battery according to the comparison result.
3. The voltage grading protection circuit according to claim 2, wherein the dc converter is controlled to disconnect from the flow battery in response to the magnitude of the voltage across the ground resistor being greater than the preset voltage value.
4. A flow battery energy storage system, comprising:
a flow battery;
a DC converter with a first end connected with the flow battery;
a voltage equalizing protection circuit according to any one of claims 1-3 disposed within said dc converter; and
And the converter is connected with the second end of the direct current converter.
5. A method of using the flow battery energy storage system of claim 4, comprising the steps of:
The DC converter controls connection to the flow battery in response to a magnitude of voltage across the ground resistor.
6. The method of claim 5, wherein the dc converter measures a voltage across the ground resistor, compares the voltage to a predetermined voltage value, and further controls the connection to the flow battery based on the comparison.
7. The method of claim 6, wherein the dc converter controls disconnection from the flow battery in response to the magnitude of the voltage across the ground resistor being greater than the preset voltage value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910410174.8A CN110289599B (en) | 2019-05-17 | 2019-05-17 | Voltage equalizing protection circuit, flow battery energy storage system and use method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910410174.8A CN110289599B (en) | 2019-05-17 | 2019-05-17 | Voltage equalizing protection circuit, flow battery energy storage system and use method |
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| Publication Number | Publication Date |
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| CN110289599A CN110289599A (en) | 2019-09-27 |
| CN110289599B true CN110289599B (en) | 2024-06-07 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203312777U (en) * | 2013-07-08 | 2013-11-27 | 北京圣博亚科技有限公司 | Intrinsic safety cell |
| CN203337594U (en) * | 2013-04-28 | 2013-12-11 | 江苏大学 | Portable device for rapidly detecting concentration of pesticides |
| CN103682397A (en) * | 2012-09-12 | 2014-03-26 | 成都天宇创新科技有限公司 | Single-battery balancer for vanadium battery |
| CN205846834U (en) * | 2016-07-20 | 2016-12-28 | 深圳市金光能太阳能有限公司 | A kind of overcharge detection control circuit of controller for solar |
| CN210577771U (en) * | 2019-05-17 | 2020-05-19 | 青海能高新能源有限公司 | Voltage-sharing protection circuit and flow battery energy storage system |
-
2019
- 2019-05-17 CN CN201910410174.8A patent/CN110289599B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103682397A (en) * | 2012-09-12 | 2014-03-26 | 成都天宇创新科技有限公司 | Single-battery balancer for vanadium battery |
| CN203337594U (en) * | 2013-04-28 | 2013-12-11 | 江苏大学 | Portable device for rapidly detecting concentration of pesticides |
| CN203312777U (en) * | 2013-07-08 | 2013-11-27 | 北京圣博亚科技有限公司 | Intrinsic safety cell |
| CN205846834U (en) * | 2016-07-20 | 2016-12-28 | 深圳市金光能太阳能有限公司 | A kind of overcharge detection control circuit of controller for solar |
| CN210577771U (en) * | 2019-05-17 | 2020-05-19 | 青海能高新能源有限公司 | Voltage-sharing protection circuit and flow battery energy storage system |
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| CN110289599A (en) | 2019-09-27 |
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