CN209948772U - High-frequency isolation and transformation energy storage system - Google Patents
High-frequency isolation and transformation energy storage system Download PDFInfo
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- CN209948772U CN209948772U CN201920238338.9U CN201920238338U CN209948772U CN 209948772 U CN209948772 U CN 209948772U CN 201920238338 U CN201920238338 U CN 201920238338U CN 209948772 U CN209948772 U CN 209948772U
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- 238000004146 energy storage Methods 0.000 title claims abstract description 88
- 238000002955 isolation Methods 0.000 title claims abstract description 50
- 230000009466 transformation Effects 0.000 title description 8
- 238000006243 chemical reaction Methods 0.000 claims abstract description 126
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 52
- 238000004891 communication Methods 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 6
- 230000033228 biological regulation Effects 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims description 3
- 230000005674 electromagnetic induction Effects 0.000 claims description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model discloses an energy storage system for high-frequency isolation conversion, which comprises a bidirectional DC/DC conversion device for high-frequency isolation conversion and a direct current bus; the first connecting point of the bidirectional DC/DC device is connected to the energy storage device; the second connection point is connected to the direct current bus, and the bidirectional DC/DC device conducts bidirectional alternating current with the direct current bus after high-frequency isolation and conversion on electric energy of the energy storage device. The utility model discloses a plurality of energy memory keep apart with the high frequency isolation transformer of the two-way conversion equipment that the direct current generating line kept apart through the high frequency, and the restriction passes through the electric energy of transformer to reduce the fault current of direct current generating line, reach the safety protection purpose, multiunit energy memory inserts the generating line through independent two-way isolation conversion equipment separately, and difference between the different energy memory no longer influences each other, and different nature's energy memory can make up the use even.
Description
Technical Field
The utility model relates to an energy storage system that high frequency was kept apart, in particular to energy storage system that transform is kept apart to high frequency.
Background
When a plurality of energy storage devices are connected to other systems, the voltages of the single energy storage devices are different, and the voltages of the internal units are unbalanced, so that the plurality of energy storage devices cannot be directly connected in parallel, or the parallel connection has hidden troubles in long-term use. Especially, when a large-scale energy storage system is formed by lithium ion batteries, the number of batteries connected in series and in parallel is too large, and imbalance of the batteries becomes a technical bottleneck of large-scale energy storage.
More remarkably, when the retired battery is used for energy storage, different battery packs have larger difference and cannot be directly connected in parallel for use, and the charging and discharging processes need to be treated differently.
In the energy storage system used at present, when the energy storage device is connected with a direct current bus, or the energy storage device is connected with an alternating current power grid through the direct current bus, a short circuit protection problem exists. That is, when the dc bus is short-circuited or the converting device is short-circuited at the side connected with the dc bus, the electric energy of the energy storage device is also released to the short-circuited point through the loop, which causes the risk of accident enlargement. The traditional solution is to add an isolation transformer on the ac side of the inverter system, and because of the lower frequency, the electric energy passing through the transformer is still large, and there is no effective way to limit the electric energy released by the energy storage device on the dc bus.
For charging and discharging applications with impact characteristics, the direct adoption of an energy storage mode has limitations. For example, as the high-current charging for energy recovery, the cost or the volume of a battery is directly large, the solution is to combine different energy storage modes, a super capacitor or a high-rate energy storage battery is adopted for high-rate short-time energy storage, and a common lithium ion battery is adopted for long-time energy storage, so that the energy conversion cannot be flexibly carried out.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that an energy storage system of transform is kept apart to high frequency is provided, treats different energy memory distinctively, carries out charge-discharge respectively and handles, keeps apart through high frequency transformer between energy memory and the direct current generating line, and energy memory most is restricted during the short circuit, effectively takes precautions against the risk that the accident enlarges, effectively solves a great deal of not enough among the prior art.
The utility model discloses a realize through following technical scheme: an energy storage system for high-frequency isolation conversion comprises a bidirectional DC/DC conversion device for high-frequency isolation conversion and a direct current bus; the first connecting point of the bidirectional DC/DC device is connected to the energy storage device; the second connection point is connected to the direct current bus, and the bidirectional DC/DC device conducts bidirectional alternating current with the direct current bus after high-frequency isolation and conversion on electric energy of the energy storage device.
The bidirectional DC/DC conversion device comprises a first stage conversion, a high-frequency isolation transformer and a second stage conversion, wherein the first stage conversion is connected with the energy storage device, the second stage conversion is connected with the direct current bus, and the high-frequency isolation transformer is connected with the first stage conversion and the second stage conversion.
As a preferred technical solution, the high frequency isolated bidirectional DC/DC conversion has two directional conversions, the first directional conversion: the direct current energy of the energy storage unit is converted into high-frequency electric energy through first-stage conversion, the high-frequency electric energy is converted into high-frequency electric energy with different voltages through the conversion of the high-frequency isolation transformer, the high-frequency electric energy is converted into direct current through second-stage conversion, and the direct current is output to a direct current bus;
and second direction conversion: the direct current bus is converted into direct current electric energy for the second stage, the direct current electric energy is converted into high-frequency electric energy through the second stage, the high-frequency electric energy is converted into high-frequency electric energy with different voltages through the high-frequency isolation transformer, the high-frequency electric energy is converted into direct current electric energy through the first stage, and the direct current electric energy is input into the energy storage device.
As the preferred technical scheme, the electric energy on both sides of the high-frequency isolation transformer is isolated by the high-frequency isolation transformer, and electric conductors on both sides are not directly conducted; high frequency electrical energy is transmitted from one side to the other by electromagnetic induction.
As a preferred technical solution, the bidirectional DC/DC conversion device includes a DC/DC conversion device control unit, the DC/DC control unit internally controls the first-stage conversion, the second-stage conversion, and the high-frequency isolation transformer to operate, and externally has at least two communication buses: the first communication bus is connected with the energy storage device, and the second communication bus is connected with the system control unit.
According to the preferable technical scheme, the control unit of the DC/DC conversion device obtains the energy storage information according to the communication between the first communication bus and the energy storage device, the second communication bus obtains the energy storage system control requirement information, and the direct current bus voltage information acquired by the internal sampling circuit controls the conversion direction, the conversion power and the conversion energy of the bidirectional DC/DC conversion device.
As a preferred technical solution, the DC/DC conversion device control unit controls the conversion direction and the conversion power of the bidirectional DC/DC conversion device according to the information of the stored energy obtained by the communication between the first communication bus and the energy storage device and the DC bus voltage information acquired by the internal sampling circuit and according to the regulation rule of the DC bus voltage, and automatically maintains the voltage stability of the DC bus.
As a preferred technical scheme, the direct current bus comprises a positive electrode bus and a negative electrode bus, wherein the positive electrode bus and the negative electrode bus are respectively connected to one or more high-frequency isolation bidirectional DC/DC conversion devices and are simultaneously connected to other devices through input and output access points.
As a preferred technical scheme, the energy storage device stores externally input electric energy through direct current input, or releases electric energy through direct current output, and the voltage and current of the electric energy are changed during the input and output processes of the electric energy; or the bidirectional DC/DC conversion device is connected with a plurality of energy storage devices, different energy storage devices or a plurality of same energy storage devices, and is connected with the same bus for electric energy exchange by connecting the bidirectional DC/DC conversion device.
As a preferred technical solution, the different energy storage devices connected to the dc bus have different powers in the first and second transformation directions, the transformed power is controlled by the system control unit, and the system control unit controls the transformed power according to the power requirements in the first transformation direction and the second transformation direction and the characteristics of the energy storage devices and according to a preset optimal control mode.
The utility model has the advantages that: the utility model discloses a plurality of energy memory keep apart with the high frequency isolation transformer of the two-way conversion equipment that the direct current generating line kept apart through the high frequency, and the restriction passes through the electric energy of transformer to reduce the fault current of direct current generating line, reach the safety protection purpose, multiunit energy memory inserts the generating line through independent two-way isolation conversion equipment separately, and difference between the different energy memory no longer influences each other, and different nature's energy memory can make up the use even.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a schematic structural diagram of a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of a second embodiment of the present invention.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
As shown in fig. 1, a bidirectional DC/DC converter 1 including high-frequency isolated conversion and a DC bus 11; the first connection point of the bidirectional DC/DC device is connected to the energy storage device 8; the second connection point is connected to the direct current bus 11, and the bidirectional DC/DC device conducts bidirectional alternating current with the direct current bus 11 after high-frequency isolation and conversion on the electric energy of the energy storage device 8.
The bidirectional DC/DC conversion device 1 containing high-frequency isolation conversion comprises a first-stage conversion 2, a high-frequency isolation transformer 4 and a second-stage conversion 3, wherein the first-stage conversion 2 is connected with an energy storage device 8, the second-stage conversion 2 is connected with a direct-current bus 11, and the high-frequency isolation transformer 4 is connected with the first-stage conversion 2 and the second-stage conversion 3.
In this embodiment, the high-frequency isolated bidirectional DC/DC conversion has two directional conversions, the first directional conversion: the direct current energy of the energy storage unit is converted into high-frequency electric energy through first-stage conversion, the high-frequency electric energy is converted into high-frequency electric energy with different voltages through the conversion of the high-frequency isolation transformer, the high-frequency electric energy is converted into direct current through second-stage conversion, and the direct current is output to a direct current bus;
and second direction conversion: the direct current bus 11 inputs direct current electric energy to the second-stage conversion 3, the direct current electric energy is converted into high-frequency electric energy through the second-stage conversion 3, the high-frequency electric energy is converted into high-frequency electric energy with different voltages through a high-frequency isolation transformer, the high-frequency electric energy is converted into direct current electric energy through the first-stage conversion, and the direct current electric energy is input into the energy storage device.
In this embodiment, the electric energy at the two sides of the high-frequency isolation transformer 4 is isolated by the high-frequency isolation transformer, and the electric conductors at the two sides are not directly conducted; high frequency electrical energy is transmitted from one side to the other by electromagnetic induction.
In this embodiment, the bidirectional DC/DC converter includes a DC/DC converter control unit 5, which internally controls the first-stage converter 2, the second-stage converter 3, and the high-frequency isolation transformer 4, and externally has at least two communication buses: the first communication bus 6 is connected with the energy storage device, and the second communication bus 7 is connected with the system control unit 10.
In this embodiment, the DC/DC conversion device control unit controls the conversion direction, the conversion power, and the conversion energy of the bidirectional DC/DC conversion device according to the information of the stored energy obtained by the communication between the first communication bus 6 and the energy storage device, the information of the control requirement of the energy storage system obtained by the second communication bus 7, and the information of the DC bus voltage collected by the internal sampling circuit.
In this embodiment, the DC/DC conversion device control unit controls the conversion direction and the conversion power of the bidirectional DC/DC conversion device according to the information of the stored energy obtained by the communication between the first communication bus 6 and the energy storage device 8, and the DC bus voltage information acquired by the internal sampling circuit, and according to the regulation rule of the DC bus voltage, and automatically maintains the voltage stability of the DC bus.
In this embodiment, the DC bus 11 includes a positive bus and a negative bus, and the positive bus and the negative bus are respectively connected to one or more of the high-frequency isolated bidirectional DC/DC converters, and are connected to other devices through the input/output access point.
In this embodiment, the energy storage device 8 stores externally input electric energy through a dc input, or discharges electric energy through a dc output, and during the input and output processes of the electric energy, the voltage and current of the electric energy change; or the bidirectional DC/DC conversion device is connected with a plurality of energy storage devices, different energy storage devices or a plurality of same energy storage devices, and is connected with the same bus for electric energy exchange by connecting the bidirectional DC/DC conversion device.
In this embodiment, the different energy storage devices connected to the dc bus have different powers in the first and second transformation directions, the transformed power is controlled by the system control unit, and the system control unit controls the transformed power according to the power requirements in the first transformation direction and the second transformation direction and the characteristics of the energy storage devices and according to a preset optimal control mode.
Embodiment 1:
referring to fig. 2, the high-frequency isolation bidirectional conversion energy storage system comprises a high-frequency isolation conversion bidirectional DC/DC conversion device, a direct current bus, a battery pack and a bidirectional inverter (PCS).
The high-frequency isolation bidirectional conversion energy storage system comprises a plurality of groups of battery packs and a plurality of groups of high-frequency isolation bidirectional conversion devices connected with batteries and connected to a direct current bus. The bidirectional inverter is connected with the direct current bus and the alternating current power grid.
The energy of the batteries is discharged to the power grid through bidirectional DC/DC conversion and bidirectional DC/AC conversion, and the power grid charges the battery pack through the conversion device.
The embodiment is applied to energy exchange between the battery and the power grid.
Embodiment 2:
referring to fig. 3, the high-frequency isolation bidirectional conversion energy storage system connects a plurality of groups of battery packs to a direct current bus, and the direct current bus is connected with a photovoltaic array through a Maximum Power Point Tracking (MPPT) conversion device. Meanwhile, the direct current bus is connected with a DC/DC direct current charging system to charge the electric automobile.
The above embodiment is an off-grid photovoltaic energy storage charging system, where electric energy is from a photovoltaic array, power is supplied to a dc bus by maximum power tracking, power is supplied to a dc charging device by the bus, and excess electric energy is stored in a battery pack by the energy storage system. When solar energy is not available, the battery pack discharges to provide electric energy for the bus.
The system is connected with different battery packs through a plurality of bidirectional conversion devices, preferably, the system is connected with a retired battery pack, and the retired battery pack is used as energy storage charging.
The utility model has the advantages that: the utility model discloses a plurality of energy memory keep apart with the high frequency isolation transformer of the two-way conversion equipment that the direct current generating line kept apart through the high frequency, and the restriction passes through the electric energy of transformer to reduce the fault current of direct current generating line, reach the safety protection purpose, multiunit energy memory inserts the generating line through independent two-way isolation conversion equipment separately, and difference between the different energy memory no longer influences each other, and different nature's energy memory can make up the use even.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the creative work should be covered within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope defined by the claims.
Claims (10)
1. An energy storage system of high frequency isolation transform, characterized by: a bidirectional DC/DC conversion device including high-frequency isolation conversion and a DC bus; the first connecting point of the bidirectional DC/DC device is connected to the energy storage device; the second connection point is connected to the direct current bus, and the bidirectional DC/DC device conducts bidirectional alternating current with the direct current bus after high-frequency isolation and conversion on electric energy of the energy storage device.
2. The high frequency isolated switched energy storage system of claim 1, wherein: the bidirectional DC/DC conversion device comprises a first-stage conversion, a high-frequency isolation transformer and a second-stage conversion, wherein the first-stage conversion is connected with the energy storage device, the second-stage conversion is connected with the direct-current bus, and the high-frequency isolation transformer is connected with the first-stage conversion and the second-stage conversion.
3. The high frequency isolated switched energy storage system of claim 2, wherein: the high-frequency isolation bidirectional DC/DC conversion has two direction conversions, the first direction conversion is as follows: the direct current energy of the energy storage unit is converted into high-frequency electric energy through first-stage conversion, the high-frequency electric energy is converted into high-frequency electric energy with different voltages through the conversion of the high-frequency isolation transformer, the high-frequency electric energy is converted into direct current through second-stage conversion, and the direct current is output to a direct current bus;
and second direction conversion: the direct current bus is converted into direct current electric energy for the second stage, the direct current electric energy is converted into high-frequency electric energy through the second stage, the high-frequency electric energy is converted into high-frequency electric energy with different voltages through the high-frequency isolation transformer, the high-frequency electric energy is converted into direct current electric energy through the first stage, and the direct current electric energy is input into the energy storage device.
4. The high frequency isolated switched energy storage system of claim 2, wherein: the electric energy on the two sides of the high-frequency isolation transformer is isolated by the high-frequency isolation transformer, and electric conductors on the two sides are not directly conducted; high frequency electrical energy is transmitted from one side to the other by electromagnetic induction.
5. The high frequency isolated switched energy storage system of claim 1, wherein: the bidirectional DC/DC conversion device comprises a DC/DC conversion device control unit, the DC/DC control unit internally controls the work of a first-stage conversion, a second-stage conversion and a high-frequency isolation transformer, and the bidirectional DC/DC conversion device externally has at least two communication buses: the first communication bus is connected with the energy storage device, and the second communication bus is connected with the system control unit.
6. The high frequency isolated switched energy storage system of claim 5, wherein: the control unit of the DC/DC conversion device obtains the information of energy storage according to the communication between the first communication bus and the energy storage device, the second communication bus obtains the information of the control requirement of the energy storage system, and the DC bus voltage information collected by the internal sampling circuit controls the conversion direction, the conversion power and the conversion energy of the bidirectional DC/DC conversion device.
7. The high frequency isolated switched energy storage system of claim 5, wherein: the control unit of the DC/DC conversion device controls the conversion direction and the conversion power of the bidirectional DC/DC conversion device according to the stored energy information acquired by the communication between the first communication bus and the energy storage device, the direct current bus voltage information acquired by the internal sampling circuit and the regulation rule of the direct current bus voltage, and the voltage stability of the direct current bus is automatically maintained.
8. The high frequency isolated switched energy storage system of claim 1, wherein: the direct current bus comprises a positive bus and a negative bus, wherein the positive bus and the negative bus are respectively connected to one or more high-frequency isolation bidirectional DC/DC conversion devices and are simultaneously connected to the high-frequency isolation bidirectional DC/DC conversion devices through input and output access points.
9. The high frequency isolated switched energy storage system of claim 1, wherein: the energy storage device stores externally input electric energy through direct current input or releases electric energy through direct current output, and the voltage and the current of the electric energy are changed in the input and output processes of the electric energy; or the bidirectional DC/DC conversion device is connected with a plurality of energy storage devices, different energy storage devices or a plurality of same energy storage devices, and is connected with the same bus for electric energy exchange by connecting the bidirectional DC/DC conversion device.
10. The high frequency isolated switched energy storage system of claim 9, wherein: the different energy storage devices connected to the direct current bus have different powers in the first conversion direction and the second conversion direction, the converted power is controlled by the system control unit, and the system control unit controls the converted power according to the power requirements in the first conversion direction and the second conversion direction and the characteristics of the energy storage devices and according to a preset optimal control mode.
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| CN201920238338.9U CN209948772U (en) | 2019-02-26 | 2019-02-26 | High-frequency isolation and transformation energy storage system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109672260A (en) * | 2019-02-26 | 2019-04-23 | 深圳英飞源技术有限公司 | A kind of energy-storage system of high-frequency isolation transformation |
| CN111740437A (en) * | 2020-05-09 | 2020-10-02 | 深圳英飞源技术有限公司 | Management method, device and circuit of energy storage system, electronic equipment and storage medium |
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2019
- 2019-02-26 CN CN201920238338.9U patent/CN209948772U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109672260A (en) * | 2019-02-26 | 2019-04-23 | 深圳英飞源技术有限公司 | A kind of energy-storage system of high-frequency isolation transformation |
| CN111740437A (en) * | 2020-05-09 | 2020-10-02 | 深圳英飞源技术有限公司 | Management method, device and circuit of energy storage system, electronic equipment and storage medium |
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