CN111224419A - Energy storage inverter - Google Patents
Energy storage inverter Download PDFInfo
- Publication number
- CN111224419A CN111224419A CN202010139299.4A CN202010139299A CN111224419A CN 111224419 A CN111224419 A CN 111224419A CN 202010139299 A CN202010139299 A CN 202010139299A CN 111224419 A CN111224419 A CN 111224419A
- Authority
- CN
- China
- Prior art keywords
- converter
- direct
- bus
- voltage
- voltage battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004146 energy storage Methods 0.000 title claims abstract description 43
- 238000004804 winding Methods 0.000 claims description 26
- 239000003990 capacitor Substances 0.000 claims description 14
- 230000002457 bidirectional effect Effects 0.000 claims description 5
- 230000009977 dual effect Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 241001544485 Cordulegastridae Species 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
Images
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Dc-Dc Converters (AREA)
Abstract
Embodiments of the present invention provide an energy storage inverter including a DC bus, a low voltage battery interface, a high voltage battery interface, a first DC/DC converter, and a DC/AC converter connected between the DC bus and a load and/or a grid. The low-voltage battery interface is connected with the direct-current bus through the first DC/DC converter, and the controller controls the first DC/DC converter to realize the charge and discharge control of the low-voltage storage battery externally connected with the low-voltage battery interface. The high-voltage battery interface can be directly connected with a direct-current bus, and the controller controls the DC/AC converter to realize the charge and discharge control of the high-voltage storage battery externally connected with the high-voltage battery interface. Therefore, the energy storage inverter provided by the invention is compatible with a low-voltage storage battery and a high-voltage storage battery, and the product compatibility is strong.
Description
Technical Field
The invention relates to the technical field of inverters, in particular to an energy storage inverter.
Background
The direct current side of the energy storage inverter is connected with the photovoltaic group string and the storage battery, and the alternating current output end of the energy storage inverter is connected with a power grid or supplies power for a load. The energy storage inverter is provided with a DC/DC converter between a direct current bus and a storage battery for voltage conversion. Two technical routes appear in the current storage battery: one is a 48V low voltage battery that follows the traditional communication power scheme; the other is a high-voltage battery for improving the system efficiency, and the battery voltage is usually 150V or more. The existing energy storage inverter is designed differently for the two storage batteries, namely, the same energy storage inverter can only be suitable for a low-voltage storage battery or a high-voltage storage battery and cannot be compatible with the two storage batteries.
Disclosure of Invention
In view of the above, the present invention provides an energy storage inverter, which is intended to achieve the purpose of being compatible with a low-voltage battery and a high-voltage battery.
In order to achieve the above object, the following solutions are proposed:
an energy storage inverter comprising:
a direct current bus;
the direct current port is connected with the direct current bus, and the alternating current port is used for connecting a DC/AC converter of a load and/or a power grid;
a first DC/DC converter having a DC port connected to the DC bus;
the low-voltage battery interface is used for externally connecting a low-voltage storage battery, and the low-voltage battery interface is internally connected with the other direct current port of the first DC/DC converter;
the high-voltage battery interface is used for externally connecting a high-voltage storage battery and is internally connected with the direct-current bus; and the number of the first and second groups,
and the controller is respectively connected with the control end of the first DC/DC converter and the control end of the DC/AC converter.
Optionally, a second DC/DC converter is further connected between the high-voltage battery interface and the DC bus;
the controller is connected with the control end of the second DC/DC converter.
Optionally, the first DC/DC converter and the second DC/DC converter are both: a dual active full bridge DC/DC converter;
the full-bridge circuit on the direct-current bus side in the first DC/DC converter and the full-bridge circuit on the direct-current bus side in the second DC/DC converter are the same full-bridge circuit;
the transformer winding at the side of the direct current bus in the first DC/DC converter and the transformer winding at the side of the direct current bus in the second DC/DC converter are the same transformer winding;
and the capacitor at the side of the direct current bus in the first DC/DC converter and the capacitor at the side of the direct current bus in the second DC/DC converter are the same capacitor.
Optionally, the transformer winding on the low-voltage battery interface side in the first DC/DC converter and the transformer winding on the high-voltage battery interface side in the second DC/DC converter are of an auto-coupling structure.
Optionally, the first DC/DC converter is a dual-active full-bridge DC/DC converter, and the second DC/DC converter is a bidirectional Buck/Boost converter multiplexing a full-bridge circuit, a transformer winding, and a capacitor on a DC bus side of the dual-active full-bridge DC/DC converter.
Optionally, the inductor in the dual-active full-bridge DC/DC converter is disposed on the DC bus side.
Optionally, the energy storage inverter further comprises a second DC/DC converter;
the high-voltage battery interface is internally connected with the direct-current bus, and is connected with a direct-current port of the first DC/DC converter through the direct-current bus, and the direct-current bus is replaced by:
and the inner side port of the high-voltage battery interface and one direct current port of the first DC/DC converter are connected with the same direct current port of the second DC/DC converter, and the other direct current port of the second DC/DC converter is connected with the direct current bus.
Optionally, a first switch is further connected between the high-voltage battery interface and the dc bus; and/or the presence of a gas in the gas,
and a second switch is also connected between the low-voltage battery interface and the direct-current bus.
Optionally, the first switch and the second switch specifically include: a double pole double throw switch.
Optionally, a first buffer circuit is further connected between the high-voltage battery interface and the dc bus, and the controller is connected to a control end of a switching tube in the first buffer circuit; and/or the presence of a gas in the gas,
and a second buffer circuit is also connected between the low-voltage battery interface and the direct-current bus, and the controller is connected with the control end of a switch tube in the second buffer circuit.
Optionally, the energy storage inverter further includes:
the photovoltaic direct-current interface circuit comprises N third DC/DC converters and N photovoltaic direct-current interfaces, wherein N is a positive integer, and the third DC/DC converters and the photovoltaic direct-current interfaces are arranged in a one-to-one correspondence manner;
each photovoltaic direct-current interface is used for externally connecting a photovoltaic group string, one direct-current port of the corresponding third DC/DC converter is connected with each photovoltaic direct-current interface in an inscribed mode, and the other direct-current port of each third DC/DC converter is connected with the direct-current bus;
the controller is respectively connected with the control end of each third DC/DC converter.
Compared with the prior art, the technical scheme of the invention has the following advantages:
the energy storage inverter that above-mentioned technical scheme provided includes: the system comprises a direct current bus, a low-voltage battery interface, a high-voltage battery interface, a first DC/DC converter and a DC/AC converter connected between the direct current bus and a load and/or a power grid. The low-voltage battery interface is connected with the direct-current bus through the first DC/DC converter, and the controller controls the first DC/DC converter to realize the charge and discharge control of the low-voltage storage battery externally connected with the low-voltage battery interface. The high-voltage battery interface can be directly connected with a direct-current bus, and the controller controls the DC/AC converter to realize the charge and discharge control of the high-voltage storage battery externally connected with the high-voltage battery interface. Therefore, the energy storage inverter provided by the invention is compatible with a low-voltage storage battery and a high-voltage storage battery, and the product compatibility is strong.
Drawings
In order to more clearly illustrate the embodiments of the 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, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an energy storage inverter according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another energy storage inverter according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another energy storage inverter according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an interlock switch according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a three-port DC/DC converter according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of another three-port DC/DC converter according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a three-port DC/DC converter according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a three-port DC/DC converter according to another embodiment of the present invention;
fig. 9 is a schematic structural diagram of another energy storage inverter according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of an energy storage inverter according to an embodiment of the present invention. The energy storage inverter includes a controller, a low voltage battery interface, a high voltage battery interface, a DC bus L, DC/AC converter, and a first DC/DC converter. The direct current port of the DC/AC converter is connected with a direct current bus; the AC port of the DC/AC converter is used to connect a load and/or a grid.
One DC port of the first DC/DC converter is connected to the DC bus L. The low-voltage battery interface is internally connected with the other direct current port of the first DC/DC converter. The low-voltage battery interface is used for externally connecting a low-voltage storage battery. The first DC/DC converter may particularly be an isolated DC/DC converter based on a frequency converter transformer. When the first DC/DC converter is in operation, the voltage of the DC port connected to the low-voltage battery interface is lower than the voltage of the DC port connected to the DC bus L. In a specific embodiment, the voltage of the DC port connected to the low voltage battery interface is less than half the voltage of the DC port connected to the DC bus L when the first DC/DC converter is in operation.
The high-voltage battery interface is internally connected with the direct-current bus L and is externally connected with the high-voltage storage battery. The controller is connected to the control terminal of the first DC/DC converter and the control terminal of the DC/AC converter, respectively (not shown).
When the low-voltage battery interface is externally connected with the low-voltage battery, the controller respectively controls the running states of the first DC/DC converter and the DC/AC converter, and the charging and discharging control of the low-voltage battery is realized. When the high-voltage battery interface is externally connected with the high-voltage battery, the controller controls the running state of the DC/AC converter to realize the charge and discharge control of the high-voltage battery. And further, the compatibility between the low-voltage storage battery and the high-voltage storage battery is realized.
Fig. 2 is another energy storage inverter provided in an embodiment of the present invention, compared with the energy storage inverter provided in fig. 1, a first buffer circuit S1 is further connected between the high-voltage battery interface and the dc bus, and the controller is connected to the control end of the switching tube in the first buffer circuit S1; and a second buffer circuit S2 is connected between the low-voltage battery interface and the direct-current bus, and the controller is connected with the control end of the switch tube in the second buffer circuit S2. When the voltage difference between the high-voltage battery interface and the direct-current bus exceeds a preset first voltage threshold value, the controller controls the switching tube to be switched off, so that the current flowing through is limited, and the high-voltage storage battery is protected. When the voltage difference between the low-voltage battery interface and the direct-current bus exceeds a preset second voltage threshold value, the controller controls the switching tube to be disconnected, so that the current flowing through is limited, and the low-voltage storage battery is protected.
After the control switch tube is disconnected, the controller can also adjust the voltage of the direct current bus by controlling the DC/AC converter so as to reduce the voltage difference between the battery interface and the direct current bus; when the voltage difference between the battery interface and the direct current bus does not exceed a preset voltage threshold value, the switch tube is controlled to be closed, and the energy storage inverter is connected to the grid for power generation/charging or supplies power to a load. When the voltage of the direct current bus is smaller than the voltage of the storage battery and exceeds a preset voltage threshold, the switching tube is controlled to be switched off, the storage battery can be charged to the direct current bus in a current-limiting mode through the buffer circuit, and when the difference between the voltages on the two sides does not exceed the preset voltage threshold, the switching tube is switched on.
The first snubber circuit S1 and the second snubber circuit S2 each include a switching transistor, a resistor, and a diode. The resistor and the diode which are connected in series form a buffer circuit after being connected with the switch tube in parallel; the side of the diode close to the storage battery is an anode, and the side far from the storage battery is a cathode. The buffer circuit shown in fig. 2 is an exemplary illustration and should not be construed as limiting the invention. Other buffer circuit structures, such as a modified buffer circuit in which a diode is removed from the buffer circuit shown in fig. 2, or a resistor is connected in series with a switching tube, and the like, are within the protection scope of the present invention.
Fig. 3 is a schematic diagram of another energy storage inverter provided in an embodiment of the present invention, which further includes a second DC/DC converter, a third DC/DC converter, and a photovoltaic DC interface, compared with the energy storage inverter provided in fig. 1. The second DC/DC converter is connected between the high-voltage battery interface and the direct-current bus L; the controller is further connected to the control terminals of the second and third DC/DC converters, respectively (not shown). One direct current port of the third DC/DC converter is connected with the direct current bus L; the photovoltaic direct current interface is internally connected with the other direct current port of the third DC/DC converter. The photovoltaic direct current interface is used for externally connecting a photovoltaic group string. When the second DC/DC converter is in operation, the voltage of the DC port connected to the high-voltage battery interface is lower than the voltage of the DC port connected to the DC bus L.
While one pv dc interface is shown in fig. 3, it is understood that the energy storage inverter may have two or more pv dc interfaces to connect multiple pv strings. And each photovoltaic direct-current interface is connected with the direct-current bus L through a corresponding third DC/DC converter. The third DC/DC converter is used for Maximum Power Point (MPPT) tracking of the photovoltaic string. The third DC/DC converter may specifically be a boost circuit.
The controller identifies whether the low-voltage battery interface and the high-voltage battery interface are connected with the storage battery or not and whether the battery type and the voltage of the connected storage battery correspond to the battery interface or not through the detection circuit and the communication, and performs charge and discharge control on the corresponding storage battery when the judgment results are correct. For example, the difference between the voltage obtained by detecting the voltage of the low-voltage battery interface and 48V is smaller than a preset voltage threshold, the storage battery is identified as a low-voltage storage battery of biddi through communication, and then the type and the voltage of the battery connected with the low-voltage battery interface are determined to be correct, and then the charging and discharging control of the low-voltage storage battery is performed through the first DC/DC converter. And the difference value between the voltage obtained by detecting the voltage of the high-voltage battery interface and 200V is smaller than a preset voltage threshold value, the storage battery is identified to be a BYD high-voltage storage battery through communication, the battery type and the voltage connected with the high-voltage battery interface are determined to be correct, and then the charge and discharge control of the high-voltage storage battery is carried out through a second DC/DC converter.
In a specific embodiment, the first DC/DC converter and the second DC/DC converter can provide 1.5-10 times of amplification factor, so that the battery interface voltage and the voltage range of the DC bus have a wider regulation range, and the accessible battery voltage and types are wider. The energy storage inverter provided by the invention can be a single-phase inverter and can also be a three-phase inverter.
The control logics and parameters for different types of storage batteries are set in advance and pre-stored in a memory of a controller, and when the battery type of the storage battery is identified, the control logics and parameters corresponding to the storage battery are selected to perform charge and discharge control.
When the low-voltage battery and the high-voltage battery are simultaneously connected with the energy storage inverter provided by the invention, the communication of the two batteries CAN be connected to a bus, such as an RS485 bus or a CAN bus. The controller of the energy storage inverter identifies the battery types of the two storage batteries in a polling mode, and further judges whether the battery connection is correct or not through the port voltage.
The first DC/DC converter and the second DC/DC converter are both bidirectional DC/DC converters, and therefore, when the high-voltage battery and the low-voltage battery are simultaneously connected, energy can flow between the low-voltage battery and the DC bus L, between the high-voltage battery and the DC bus L, and between the low-voltage battery and the high-voltage battery. In order to avoid interference and other problems caused by the simultaneous operation of the two storage batteries, a first switch can be arranged between the high-voltage battery interface and the direct-current bus L; and a second switch is arranged between the low-voltage battery interface and the direct-current bus. When one of the storage batteries is put into use, the other storage battery is disconnected from the dc bus L. Or by providing an interlock arrangement such that the first switch and the second switch cannot be closed simultaneously. As shown in fig. 4, the functions of the first switch and the second switch are realized by using a double-pole double-throw switch, and when the switch is switched to any side, only one storage battery can be connected.
The functions of the first DC/DC converter and the second DC/DC converter may be realized by a three-port DC/DC converter. Referring to fig. 5, a dual-active full-bridge DC/DC converter structure is respectively arranged between the high-voltage battery interface and the DC bus L and between the low-voltage battery interface and the DC bus L, and the two dual-active full-bridge DC/DC converters multiplex part of the circuit structure; namely, the two double-active full-bridge DC/DC converters share the full-bridge circuit, the transformer winding and the capacitor on the direct-current bus side, so the cost is low. And the number of turns of the transformer winding at the low-voltage interface side of the double-active full-bridge DC/DC converter connected with the low-voltage battery interface is greater than that of the transformer winding at the high-voltage interface side of the double-active full-bridge DC/DC converter connected with the high-voltage battery interface.
For the case that the charging and discharging power of the storage battery is not particularly large, or two storage batteries do not operate simultaneously, the transformer windings in fig. 5 may be further multiplexed, and the transformer winding on the low voltage interface side of the dual-active full-bridge DC/DC converter connected to the low voltage battery interface and the transformer winding on the high voltage interface side of the dual-active full-bridge DC/DC converter connected to the high voltage battery interface are set to be in an auto-coupling structure, as shown in fig. 6, to further reduce the size and cost of the transformer. For example, originally, there are 1 winding of 20 turns and 1 winding of 60 turns, and the two windings need 80 turns in total; after the self-coupling structure is adopted, the winding with 20 turns can be used as the winding with a part of 60 turns, so that the winding which originally needs 60 turns only needs 40 turns, and the two windings only need 60 turns in total, thereby saving 20 turns.
Fig. 7 is a diagram of another three-port DC/DC converter according to an embodiment of the present invention. A double-active full-bridge DC/DC converter is adopted between the low-voltage battery interface and the direct-current bus, and a bidirectional Buck/Boost converter is adopted between the high-voltage battery interface and the direct-current bus L. The bidirectional Buck/Boost converter multiplexes a full-bridge circuit, a transformer winding and a capacitor on the direct current bus side of the double-active full-bridge DC/DC converter. According to the scheme, only the capacitor and the inductor are added to the original low-voltage storage battery converter topology to form the high-voltage storage battery converter, and the implementation cost is low. Furthermore, a switch is connected in series between the capacitor of the high-voltage battery interface and the bus, so that the interference of the capacitor of the high-voltage battery interface on the topology operation is avoided when only the low-voltage storage battery is connected for operation.
Fig. 8 is a diagram of another three-port DC/DC converter according to an embodiment of the present invention. Compared to the three-port DC/DC converter shown in fig. 7, the inductance of the dual-active full-bridge DC/DC converter employed between the low-voltage battery interface and the DC bus L is disposed on the DC bus side. According to the scheme, the high-voltage storage battery converter can be formed only by adding the capacitor on the original low-voltage storage battery converter topology, and the implementation cost is lower.
Fig. 9 is a schematic diagram of another energy storage inverter according to an embodiment of the present invention. The low-voltage battery interface is connected with a direct-current bus L through a first DC/DC converter and a second DC/DC converter in sequence; the high-voltage battery interface is connected with the direct-current bus L through a second DC/DC converter. The high-voltage battery interface and the first DC/DC converter are connected to the same direct current port of the second DC/DC converter.
The above-described embodiments of the apparatus are merely illustrative, and some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the present specification, the emphasis points of the embodiments are different from those of the other embodiments, and the same and similar parts among the embodiments may be referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (11)
1. An energy storage inverter, comprising:
a direct current bus;
the direct current port is connected with the direct current bus, and the alternating current port is used for connecting a DC/AC converter of a load and/or a power grid;
a first DC/DC converter having a DC port connected to the DC bus;
the low-voltage battery interface is used for externally connecting a low-voltage storage battery, and the low-voltage battery interface is internally connected with the other direct current port of the first DC/DC converter;
the high-voltage battery interface is used for externally connecting a high-voltage storage battery and is internally connected with the direct-current bus; and the number of the first and second groups,
and the controller is respectively connected with the control end of the first DC/DC converter and the control end of the DC/AC converter.
2. The energy storage inverter of claim 1, wherein a second DC/DC converter is further connected between the high voltage battery interface and the DC bus;
the controller is connected with the control end of the second DC/DC converter.
3. The energy storage inverter of claim 2, wherein the first DC/DC converter and the second DC/DC converter are each: a dual active full bridge DC/DC converter;
the full-bridge circuit on the direct-current bus side in the first DC/DC converter and the full-bridge circuit on the direct-current bus side in the second DC/DC converter are the same full-bridge circuit;
the transformer winding at the side of the direct current bus in the first DC/DC converter and the transformer winding at the side of the direct current bus in the second DC/DC converter are the same transformer winding;
and the capacitor at the side of the direct current bus in the first DC/DC converter and the capacitor at the side of the direct current bus in the second DC/DC converter are the same capacitor.
4. The energy storage inverter of claim 3, wherein the transformer winding on the low voltage battery interface side of the first DC/DC converter and the transformer winding on the high voltage battery interface side of the second DC/DC converter are self-coupled structures.
5. The energy storage inverter of claim 2, wherein the first DC/DC converter is a dual active full bridge DC/DC converter, and the second DC/DC converter is a bidirectional Buck/Boost converter that multiplexes a full bridge circuit, a transformer winding, and a capacitor on a DC bus side of the dual active full bridge DC/DC converter.
6. The energy storage inverter of claim 5, wherein the inductor in the dual active full bridge DC/DC converter is disposed on the DC bus side.
7. The energy storage inverter of claim 1, further comprising a second DC/DC converter;
connecting the direct-current bus in the high-voltage battery interface and connecting the direct-current bus with one direct-current port of the first DC/DC converter, and replacing the direct-current bus with:
and the inner side port of the high-voltage battery interface and one direct current port of the first DC/DC converter are connected with the same direct current port of the second DC/DC converter, and the other direct current port of the second DC/DC converter is connected with the direct current bus.
8. The energy storage inverter of claim 1, wherein a first switch is further connected between the high voltage battery interface and the dc bus; and the combination of (a) and (b),
and a second switch is also connected between the low-voltage battery interface and the direct-current bus.
9. The energy storage inverter according to claim 8, wherein the first switch and the second switch are specifically:
a double pole double throw switch.
10. The energy storage inverter according to claim 1, wherein a first snubber circuit is further connected between the high-voltage battery interface and the direct-current bus, and the controller is connected with a control end of a switching tube in the first snubber circuit; and/or the presence of a gas in the gas,
and a second buffer circuit is also connected between the low-voltage battery interface and the direct-current bus, and the controller is connected with the control end of a switch tube in the second buffer circuit.
11. The energy storage inverter according to any one of claims 1 to 10, further comprising: the photovoltaic direct-current interface circuit comprises N third DC/DC converters and N photovoltaic direct-current interfaces, wherein N is a positive integer, and the third DC/DC converters and the photovoltaic direct-current interfaces are arranged in a one-to-one correspondence manner;
each photovoltaic direct-current interface is used for externally connecting a photovoltaic group string, one direct-current port of the corresponding third DC/DC converter is connected with each photovoltaic direct-current interface in an inscribed mode, and the other direct-current port of each third DC/DC converter is connected with the direct-current bus;
the controller is respectively connected with the control end of each third DC/DC converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010139299.4A CN111224419A (en) | 2020-03-03 | 2020-03-03 | Energy storage inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010139299.4A CN111224419A (en) | 2020-03-03 | 2020-03-03 | Energy storage inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111224419A true CN111224419A (en) | 2020-06-02 |
Family
ID=70811858
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010139299.4A Pending CN111224419A (en) | 2020-03-03 | 2020-03-03 | Energy storage inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111224419A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113629820A (en) * | 2021-09-02 | 2021-11-09 | 阳光储能技术有限公司 | Battery module, energy storage system and control method thereof |
| WO2023231491A1 (en) * | 2022-05-31 | 2023-12-07 | 比亚迪股份有限公司 | Power battery charging switching system, and powered vehicle |
| CN118554508A (en) * | 2024-07-23 | 2024-08-27 | 深圳市远信储能技术有限公司 | Dual-battery hybrid energy storage converter, energy storage control method and device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104092382A (en) * | 2014-03-28 | 2014-10-08 | 燕山大学 | Three-input-isolation DC/DC converter |
| CN104467017A (en) * | 2014-12-24 | 2015-03-25 | 国家电网公司 | Multiport photovoltaic energy storage hybrid power generation system based on high frequency magnetic coupling |
| CN105262362A (en) * | 2015-11-09 | 2016-01-20 | 南通大学 | A high-gain Buck-Boost integrated inverter and a control method |
| CN107404110A (en) * | 2017-07-13 | 2017-11-28 | 成都麦隆电气有限公司 | A kind of non-isolated energy storage three-phase off-network inversion electric power system |
| CN110323811A (en) * | 2018-03-29 | 2019-10-11 | 比亚迪股份有限公司 | Onboard charger and its control method |
-
2020
- 2020-03-03 CN CN202010139299.4A patent/CN111224419A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104092382A (en) * | 2014-03-28 | 2014-10-08 | 燕山大学 | Three-input-isolation DC/DC converter |
| CN104467017A (en) * | 2014-12-24 | 2015-03-25 | 国家电网公司 | Multiport photovoltaic energy storage hybrid power generation system based on high frequency magnetic coupling |
| CN105262362A (en) * | 2015-11-09 | 2016-01-20 | 南通大学 | A high-gain Buck-Boost integrated inverter and a control method |
| CN107404110A (en) * | 2017-07-13 | 2017-11-28 | 成都麦隆电气有限公司 | A kind of non-isolated energy storage three-phase off-network inversion electric power system |
| CN110323811A (en) * | 2018-03-29 | 2019-10-11 | 比亚迪股份有限公司 | Onboard charger and its control method |
Non-Patent Citations (1)
| Title |
|---|
| 万沛霖主编: "《电动汽车的关键技术》", 31 December 1998 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113629820A (en) * | 2021-09-02 | 2021-11-09 | 阳光储能技术有限公司 | Battery module, energy storage system and control method thereof |
| WO2023231491A1 (en) * | 2022-05-31 | 2023-12-07 | 比亚迪股份有限公司 | Power battery charging switching system, and powered vehicle |
| CN118554508A (en) * | 2024-07-23 | 2024-08-27 | 深圳市远信储能技术有限公司 | Dual-battery hybrid energy storage converter, energy storage control method and device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11128236B2 (en) | Multi-winding single-stage multi-input boost type high-frequency link's inverter with simultaneous/time-sharing power supplies | |
| CN202197226U (en) | Power station direct current power supply device based on super capacitor | |
| CN103441566B (en) | The collaborative electric power system of a kind of civil power, photovoltaic cell and energy-storage battery and method | |
| CN105207258B (en) | A kind of photovoltaic direct-current micro-grid energy cooperative control device | |
| Wai et al. | High step-up bidirectional isolated converter with two input power sources | |
| CN103219877A (en) | Capacitor discharging circuit and converter | |
| CN111224419A (en) | Energy storage inverter | |
| CN109873568B (en) | Multi-DC port converter and control method | |
| CN109950969B (en) | Transformer substation direct current system emergency power supply based on photovoltaic standby | |
| CN103762693A (en) | Circuit structure for charge and discharge of vanadium redox battery and control method thereof | |
| CN110022071B (en) | Hybrid energy storage type direct current transformer and control method thereof | |
| CN101572429B (en) | UPS system | |
| CN104218805A (en) | Unipolar-bipolar convertible direct-current converter | |
| CN108512430A (en) | A kind of three Port Translation device of ZVZCS full-bridges and its control method | |
| CN105186919A (en) | Non-isolated grid-connected converter, air conditioning system and converter control method | |
| CN216819454U (en) | Energy storage power module and energy storage system | |
| CN107769389B (en) | Battery energy storage system of isolation symmetrical series flyback circuit | |
| Atanalian et al. | PV assisted EV charging in DC micro-grids | |
| CN116247711A (en) | Energy storage system based on load priority control | |
| CN106208788A (en) | A kind of multimode voltage source inverter based on AAC | |
| CN108023497B (en) | Series simultaneous power supply forward cycle conversion type single-stage multi-input high-frequency link inverter | |
| CN108023496B (en) | Series simultaneous selection switch voltage type single-stage multi-input low-frequency link inverter | |
| Razzaghzadeh et al. | Analysis of a bidirectional DC-DC converter with high voltage gain | |
| Liu et al. | Analysis and comparison of isolated converter based step-down partial power processing configurations | |
| CN111130198B (en) | Charging system and method for electric automobile |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200602 |
|
| RJ01 | Rejection of invention patent application after publication |