CN107612408B - Energy storage converter and energy storage system - Google Patents
Energy storage converter and energy storage system Download PDFInfo
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- CN107612408B CN107612408B CN201710812862.8A CN201710812862A CN107612408B CN 107612408 B CN107612408 B CN 107612408B CN 201710812862 A CN201710812862 A CN 201710812862A CN 107612408 B CN107612408 B CN 107612408B
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Abstract
The invention discloses an energy storage converter and an energy storage system. This energy storage converter includes: a plurality of power conversion units and corresponding power supply units; the power conversion unit comprises a control module, wherein the alternating current end of the power conversion unit is used for being connected with a first power grid, and the direct current end of the power conversion unit is used for being connected with an energy storage device; the control module is used for connecting the energy storage equipment; the power supply unit includes: the direct current power supply module, the first diode and the alternating current power supply module; the input end of the direct current power supply sub-module is connected with the energy storage device, and the output end of the direct current power supply sub-module is connected with the first diode in series and then connected with the output end of the alternating current power supply sub-module in parallel to form a control module of the power conversion unit; the input end of the alternating current power supply sub-module is used for connecting a first power grid; the direct current power supply module is used for outputting a first voltage to the control module of the power conversion unit, and the alternating current power supply module is used for outputting a second voltage to the control module of the power conversion unit; wherein the first voltage is less than the second voltage.
Description
Technical Field
The invention relates to the technical field of energy storage, in particular to an energy storage converter and an energy storage system.
Background
The energy storage system can realize alternating current-direct current conversion between the energy storage battery and the power grid, and the alternating current-direct current conversion is mainly realized by depending on an energy storage converter which is core equipment. The energy storage converter can complete bidirectional energy flow between the energy storage battery and the power grid, and generally has multiple working modes, such as grid-connected charging, grid-connected discharging, active input and output, reactive input and output, off-grid charging, off-grid discharging and the like. The energy storage converter can normally work in any mode, and a high-reliability power supply mode is needed, so that the power supply for the energy storage converter cannot be interrupted in any mode. The power supply of a power grid connected with the energy storage converter is possibly interrupted, and the power supply is unreliable by simply adopting the power grid; the electric energy of the energy storage battery is precious, the cost is high, and the battery life is influenced by the condition of power shortage when the energy storage battery works off the grid for a long time, so that the electricity is supplied and taken from the battery only and the energy storage battery is not cost-effective; the high-capacity energy storage converter adopts a modular cascade technology, the number of power modules is large, and a power supply source is difficult to supply power to all module unit controllers and other matched electric equipment.
Therefore, in order to ensure the normal operation of the high-capacity energy storage converter, a more excellent power supply technical scheme is needed, and the power supply reliability of the energy storage converter is improved.
Disclosure of Invention
In view of the above, the present invention has been developed to provide an energy storage converter and an energy storage system that overcome or at least partially solve the above problems.
According to an aspect of the present invention, there is provided an energy storage converter comprising:
the power conversion units and the power supply units respectively correspond to the power conversion units;
the power conversion unit comprises a control module, an alternating current end of the power conversion unit is used for being connected with a first power grid, and a direct current end of the power conversion unit is used for being connected with an energy storage device; the control module is used for connecting the energy storage equipment; the control module comprises one or more of the following: the device comprises a unit controller, a battery management system and a signal sampling conversion module;
the power supply unit includes: the direct current power supply module, the first diode and the alternating current power supply module;
the input end of the direct current power supply sub-module is used for being connected with the energy storage equipment, and the output end of the direct current power supply sub-module is connected with the output end of the alternating current power supply sub-module in parallel to be connected with the control module of the power conversion unit after being connected with the first diode in series;
the input end of the alternating current power supply sub-module is used for being connected with the first power grid;
the direct current power supply module is used for outputting a first voltage to the control module of the power conversion unit, and the alternating current power supply module is used for outputting a second voltage to the control module of the power conversion unit; wherein the first voltage is less than the second voltage.
Optionally, the dc power supply module includes: a first fuse, a DC/DC module, a second fuse;
the first end of the first fuse is used for being connected with the positive pole of the energy storage device, and the second end of the first fuse is connected with the positive pole of the input end of the DC/DC module;
the first end of the second fuse is used for being connected with the negative pole of the energy storage device, and the second end of the second fuse is connected with the negative pole of the input end of the DC/DC module;
the positive pole of the output end of the DC/DC module is connected with the control module of the power conversion unit through the first diode, and the negative pole of the output end of the DC/DC module is directly connected with the control module of the power conversion unit.
Optionally, the ac power supply module includes a first transformer and a rectifier module, a primary side of the first transformer is used for connecting to the first power grid, a secondary side of the first transformer is connected to an ac end of the rectifier module, and a dc end of the rectifier module is connected to the control module of the power conversion unit.
Optionally, the energy storage converter further comprises: a grid-connected reactor;
the power conversion units are cascaded into a plurality of power conversion links;
the grid-connected reactor comprises a plurality of branches, the first end of each branch is respectively used for being connected with a port of one phase of the first power grid, and the second end of each branch is respectively connected with a power conversion link.
Optionally, the power conversion unit further includes a first switch, a second switch, a current limiting resistor, an H-bridge circuit, and an LCL circuit;
the first end of the first switch is used for being connected with the anode of the energy storage device, and the second end of the first switch is connected with the first end of the first inductor of the LCL circuit through the current-limiting resistor;
the first end of the second switch is used for being connected with the anode of the energy storage device, and the second end of the second switch is directly connected with the first end of the second inductor of the LCL circuit;
the second end of the first inductor is respectively connected with the first capacitor of the LCL circuit and the first port of the direct current end of the H-bridge circuit;
a second end of the second inductor is respectively connected with the first capacitor of the LCL circuit and a second port of the direct current end of the H-bridge circuit;
and the alternating current end of the H-bridge circuit is used for being connected with the first power grid.
According to another aspect of the invention, there is provided an energy storage system comprising a first grid, a plurality of energy storage devices, such as an energy storage converter as described in any one of the above.
Optionally, the system further comprises:
the heat dissipation device comprises a plurality of heat dissipation devices, a third switch, a second transformer, a fourth switch and a third transformer; each heat dissipation device corresponds to one or more power conversion units in the energy storage converter respectively;
the heat dissipation equipment supplies power for two paths, the first path is connected with the secondary side of the second transformer through the third switch, and the primary side of the second transformer is used for being connected with a second power grid independent of the first power grid; the second path is connected with the secondary side of the third transformer through the fourth switch, and the primary side of the third transformer is connected with the alternating current end in the energy storage converter.
Optionally, the system further comprises: a grid-connected switch;
the energy storage converter is connected with the first power grid through a grid-connected switch.
Optionally, the system further comprises:
the main controller is respectively connected with the control end of the grid-connected switch, the control module in each power conversion unit of the energy storage converter, the control end of the third switch and the control end of the fourth switch;
and the main power supply module is used for supplying power to a secondary circuit and a main controller, and the secondary circuit at least comprises the third switch and the fourth switch.
Optionally, the main power supply module comprises:
the primary side of the fourth transformer is used for connecting the first power grid and the second power grid which are connected in parallel, and the secondary side of the fourth transformer is connected with the first end of an online uninterrupted power supply; and the second end of the online uninterrupted power supply is used for connecting the main controller and the secondary loop.
According to the technical scheme, the power supply units are correspondingly arranged for the power conversion units of the energy storage converter, the direct current power supply sub-module which can be connected with the energy storage equipment and the alternating current power supply sub-module which can be connected with the alternating current power grid are adopted to supply power to the control module of the power conversion units, the voltage of the direct current output is smaller than the voltage of the alternating current output, and the anode of the direct current output end is connected with the diode in series. The energy storage converter realized by the technical scheme can supply power for each power conversion unit through the alternating current power grid after the alternating current power grid and the energy storage equipment are connected, when the alternating current power grid fails, the power can be seamlessly switched to the energy storage equipment for supplying power, alternating current and direct current hybrid time-sharing power supply is realized, the stable operation of the energy storage converter is ensured, each power conversion unit independently supplies power, when any power conversion unit fails, the power conversion unit and the corresponding power supply unit are cut off, and the normal operation of other power conversion units is not influenced.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 shows a schematic structural diagram of an energy storage converter according to an embodiment of the invention;
fig. 2 shows a topology of an internal circuit of a storage converter according to an embodiment of the invention;
FIG. 3 illustrates a schematic diagram of an energy storage system according to an embodiment of the present invention;
FIG. 4 illustrates a schematic diagram of an energy storage system according to another embodiment of the present disclosure;
FIG. 5 illustrates a schematic diagram of a power supply circuit for a heat sink in accordance with one embodiment of the present invention;
FIG. 6 illustrates a main power module circuit schematic according to one embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Fig. 1 shows a schematic structural diagram of an energy storage converter according to an embodiment of the present invention. As shown in fig. 1, the energy storage converter 100 includes:
a plurality of power conversion units 110, and a power supply unit 120 corresponding to each power conversion unit 110. The power conversion unit 110 includes a control module 111, an ac terminal of the power conversion unit 110 is used for connecting to a first power grid, and a dc terminal of the power conversion unit 110 is used for connecting to an energy storage device; the control module 110 is used for connecting an energy storage device; the power supply unit 120 includes: a dc power supply module 121, a first diode 122, and an ac power supply module 123; the input end of the dc power supply sub-module 121 is used for connecting an energy storage device, and the output end of the dc power supply sub-module 121 is connected in series with the first diode 122 and then connected in parallel with the output end of the ac power supply sub-module 123 to connect the control module 111 of the power conversion unit 110; the input end of the alternating current power supply sub-module 123 is used for connecting a first power grid; the dc power supply sub-module 121 is configured to output a first voltage to the control module 111 of the power conversion unit 110, and the ac power supply sub-module 123 is configured to output a second voltage to the control module 111 of the power conversion unit 110; wherein the first voltage is less than the second voltage.
The energy storage device may be an energy storage battery pack, and specifically may be an electrochemical secondary battery such as a lithium battery, a lead-acid battery, a lead-carbon battery, or the like. The type of battery connected to each power conversion unit may be different, and may be any of the above batteries, or may be a mixture of two or more batteries. However, if a power conversion unit is connected to an energy storage battery pack, the battery types in the energy storage battery pack should be the same. The control module 111 may include a unit controller, a battery management system and a signal sampling conversion module for controlling the operation of the power conversion unit and the management of the energy storage battery pack.
The first grid may be a three-phase ac grid, the voltage class of the first grid may be three-phase 6KV, 10KV or even 35KV, the first grid may supply power to the energy storage device or may draw electric energy from the energy storage device, and once the first grid is powered down, the energy storage converter 100 needs to operate in an off-grid mode. In one case, the dc power supply module 121 may output a voltage of 220V, and the ac power supply module 123 may output a voltage of about 300V, and during a normal operating condition, because the voltage of the positive electrode of the first diode 122 is smaller than the voltage of the negative electrode, the dc power supply module does not output a voltage, and the ac power supply module supplies power for the control module 111. When the first grid is powered off, the first diode 122 is conducted, and the alternating current power supply sub-module 123 is seamlessly switched to the direct current power supply sub-module 121 to supply power; when the first power grid is restored, the power supply by the dc power supply sub-module 121 is seamlessly switched to the ac power supply sub-module 123 for power supply. It should be noted that the first voltage and the second voltage should be within a normal operating range of the control module, so that the control module can not be damaged by voltage breakdown.
It can be seen that, in the energy storage converter shown in fig. 1, power supply units are correspondingly arranged for each power conversion unit of the energy storage converter, and a dc power supply sub-module connectable to the energy storage device and an ac power supply sub-module connectable to an ac power grid are used to supply power to a control module of the power conversion unit, where the voltage of the dc output is smaller than the voltage of the ac output, and a diode is connected in series with the positive electrode of the dc output terminal. The energy storage converter realized by the technical scheme can supply power for each power conversion unit through the alternating current power grid after the alternating current power grid and the energy storage equipment are connected, when the alternating current power grid fails, the power can be seamlessly switched to the energy storage equipment for supplying power, alternating current and direct current hybrid time-sharing power supply is realized, the stable operation of the energy storage converter is ensured, each power conversion unit independently supplies power, when any power conversion unit fails, the power conversion unit and the corresponding power supply unit are cut off, and the normal operation of other power conversion units is not influenced.
In an embodiment of the present invention, in the energy storage converter, the dc power supply module 121 includes: a first fuse 124, a DC/DC module 125, a second fuse 126; a first terminal of the first fuse 124 is adapted to be connected to the positive pole of the energy storage device and a second terminal is connected to the positive pole of the input of the DC/DC module 125; a first terminal of the second fuse 126 is for connection to the negative terminal of the energy storage device and a second terminal is connected to the negative terminal of the input of the DC/DC module 125; the positive pole of the output end of the DC/DC module 125 is connected to the control module 111 of the power conversion unit 110 through the first diode 122, and the negative pole of the output end of the DC/DC module 125 is directly connected to the control module 111 of the power conversion unit 110.
The connection relationship of the above devices can be referred to fig. 2. Fig. 2 shows a topology of an internal circuit of a storage converter according to an embodiment of the invention. Taking an energy storage battery pack with a voltage range of 550V-850V as an example, the fuse 124 and the fuse 126 are respectively connected to positive and negative stages of the energy storage battery pack to function as a protection circuit, so as to prevent the energy storage battery pack and other devices from being damaged by overcurrent, and the other ends of the two fuses are connected to an input end of the DC/DC module 125, where the DC/DC module 125 may be a DC isolated conversion power supply with a wide input voltage range (e.g., 550V-850V in this example). The working process can refer to the foregoing embodiments, and details are not repeated herein.
In an embodiment of the present invention, in the energy storage converter, the ac power supply module 123 includes a first transformer 127 and a rectification module 128, a primary side of the first transformer 127 is used for connecting to a first power grid, a secondary side of the first transformer is connected to an ac terminal of the rectification module 128, and a dc terminal of the rectification module 128 is connected to the control module 111 of the power conversion unit 110. Under one operating condition, the first transformer 127 may reduce the high-voltage ac of 10KV to the low-voltage ac of 220V, and then rectify it into dc of about 300V through the rectification module 128, and the voltage output by the rectification module 128 may have a certain fluctuation.
In an embodiment of the present invention, the energy storage converter further includes: a grid-connected reactor 130; a plurality of power conversion units 110 are cascaded into a plurality of power conversion links; the grid-connected reactor 130 includes a plurality of branches, a first end of each branch is used for connecting a port of a phase of the first power grid, and a second end of each branch is connected with a power conversion link.
When the first power grid is a three-phase power grid, the grid-connected reactor comprises three branches, correspondingly, the number of the power conversion links is also three, one end of each power conversion link is connected with one branch of the grid-connected reactor, and the other end of each power conversion link can form star connection or delta connection. In this embodiment, considering that each power conversion unit adopts a cascade topology, the equivalent switching frequency is very high, and the harmonic content of the output voltage and current is low, so that a grid-connected reactor is selected instead of a traditional LCL filter. Fig. 3 shows a schematic structural diagram of the energy storage system in this case, each energy storage device is an energy storage battery pack, three power conversion links are connected in a star shape, n power conversion units are cascaded in each power conversion link, and n is a positive integer.
In an embodiment of the present invention, in the energy storage converter, the power conversion unit 110 further includes a first switch 112, a second switch 113, a current limiting resistor 114, an H-bridge circuit 115, and an LCL circuit 116; a first terminal of the first switch 112 is used for connecting the anode of the energy storage device, and a second terminal is connected to a first terminal of a first inductor 117 of the LCL circuit 116 through the current limiting resistor 114; the first terminal of the second switch 113 is used for connecting the anode of the energy storage device, and the second terminal is directly connected to the first terminal of the second inductor 118 of the LCL circuit 116; a second end of the first inductor 117 is connected to the first capacitor 119 of the LCL circuit 116 and a first port of the dc terminal of the H-bridge circuit 115, respectively; a second end of the second inductor 118 is connected to the first capacitor 119 of the LCL circuit 116 and a second port of the dc terminal of the H-bridge circuit 115, respectively; the ac terminal of the H-bridge circuit 115 is used to connect to a first grid.
In this embodiment, the power device in the H-bridge circuit 115 may be one or more of an insulated gate bipolar transistor IGBT, an integrated gate commutated thyristor IGCT, and an electron injection enhanced gate transistor IEGT. The first capacitor 119 plays a role of filtering and voltage supporting, and the first inductor 117 and the second inductor 118, in cooperation with the first capacitor 119, can filter direct current, and reduce the content of high frequency harmonics and 2 times frequency current. After the first grid and the energy storage device are connected, the first switch 112 is closed, the second switch 113 is opened, and the power devices in the H-bridge circuit 115 are precharged; after the precharge is completed, the first switch 112 is opened, and the second switch 113 is closed to perform a normal operation. Wherein the first switch 112 and the second switch 113 may be selected as contactors.
Fig. 4 shows a schematic diagram of an energy storage system according to another embodiment of the present invention, and as shown in fig. 4, the energy storage system 400 includes a first grid 410, a plurality of energy storage devices 420, such as the energy storage converter 100 in any of the above embodiments. The energy storage device 420 may be an energy storage battery, and specifically may be an electrochemical secondary battery such as a lithium battery, a lead-acid battery, a lead-carbon battery, or the like. The type of battery connected to each power conversion unit may be different, and may be any of the above batteries, or may be a mixture of two or more batteries. However, if a power conversion unit is connected to an energy storage battery pack, the battery types in the energy storage battery pack should be the same. First power grid 410 may be a three-phase ac power grid, and may have a voltage rating of 6KV, 10KV, or even 35KV at three phases, and may supply power to energy storage device 420 and may draw power from energy storage device 420, and energy storage converter 100 needs to operate in an off-grid mode once first power grid 410 is powered down.
A plurality of heat dissipation devices 430, a third switch 440, a second transformer 450, a fourth switch 460, and a third transformer 470; each heat dissipation device 430 corresponds to one or more power conversion units 110 in the energy storage converter 100; the heat sink 430 supplies power for two paths, the first path is connected to the secondary side of the second transformer 450 through the third switch 440, and the primary side of the second transformer 450 is used for connecting to a second power grid independent of the first power grid 410; the second path is connected to the secondary side of the third transformer 470 through the fourth switch 460, and the primary side of the third transformer 470 is connected to the ac terminal of the energy storage converter 100. The heat dissipation equipment can be fan equipment and supports 220V alternating current power supply; the third switch 440 and the fourth switch may be selected from relays, and the switching logics are related to each other, wherein the third switch 440 may be normally closed and the fourth switch 460 is normally open. Thus, the heat sink is normally powered by the second power grid, and if the second power grid fails, the third switch 440 is opened and the fourth switch 460 is closed to provide power from the first power grid 410 in the energy storage system 400.
In an embodiment of the present invention, the system further includes: a grid-connected switch 480; the energy storage converter 100 is connected to the first grid 410 through a grid connection switch 480.
In the above embodiment, if the first grid 410 fails, the grid tie switch 480 is opened, so that the energy storage converter operates in the off-grid mode. At this point, if the third switch 440 is open, the fourth switch 460 is closed and the heat sink 430 is powered by the energy storage device 420. This allows the heat sink 430 to provide multiple power supplies without wasting power from the energy storage device 420 (power in the energy storage device is precious and relatively more costly). The schematic circuit diagram is shown in fig. 5.
In an embodiment of the present invention, the system further includes: the main controller 490 is respectively connected with a control end of the grid-connected switch 480, the control module 111 in each power conversion unit 110 of the energy storage converter 100, a control end of the third switch 440, and a control end of the fourth switch 460; and a main power supply module 4010 for supplying power to a secondary circuit and the main controller 490, wherein the secondary circuit at least comprises a third switch 440 and a fourth switch 460. The secondary circuit can also comprise other conventional circuits such as a lighting circuit and the like. The main controller 490 may send advanced control instructions to implement peak shaving frequency modulation, emergency power supply, back-up power, smooth power or load curves, improve power quality, etc., and enable the energy storage converter 100 to operate in grid-connected charging, grid-connected discharging, active input output, reactive input output, off-grid charging, off-grid discharging, etc.
In an embodiment of the present invention, in the above system, the main power supply module 4010 includes: a fourth transformer 4011 and an online uninterruptible power supply 4012, wherein a primary side of the fourth transformer 4011 is used for connecting the first power grid 410 and the second power grid which are connected in parallel, and a secondary side of the fourth transformer 4011 is connected with a first end of the online uninterruptible power supply 4012; the second terminal of the online ups 4012 is used to connect the main controller 490 to the secondary loop. The schematic circuit diagram is shown in fig. 6.
The advantages of the power supply method adopted by the embodiment are mainly as follows: firstly, a high-quality voltage is obtained through an On-line Uninterended Power Supply 4012, and interference caused by voltage fluctuation of a Power grid is avoided; and the power supply of the double power grids and the online uninterrupted power supply are combined, so that triple guarantee is achieved, and the power supply continuity of the main controller 490 and a secondary circuit is guaranteed.
In summary, the embodiments of the present invention provide an energy storage converter for independently supplying power to each power conversion unit, in combination with the characteristics of a cascaded topology structure of the energy storage converter, each power conversion unit is correspondingly provided with a power supply unit, and a dc power supply sub-module connectable to an energy storage device and an ac power supply sub-module connectable to an ac power grid are used to supply power to a control module of the power conversion unit, where the voltage of the dc output is smaller than the voltage of the ac output, and a diode is connected in series with the positive electrode of the dc output. The energy storage converter realized by the technical scheme can supply power for each power conversion unit through the alternating current power grid after the alternating current power grid and the energy storage equipment are connected, when the alternating current power grid fails, the power can be seamlessly switched to the energy storage equipment for supplying power, alternating current and direct current hybrid time-sharing power supply is realized, the stable operation of the energy storage converter is ensured, each power conversion unit independently supplies power, when any power conversion unit fails, the power conversion unit and the corresponding power supply unit are cut off, and the normal operation of other power conversion units is not influenced.
To whole energy storage system, then start from power conversion unit, fan and main control unit and secondary circuit three aspect respectively, the multiple optimization power supply scheme that the mixed timesharing of alternating current-direct current was supplied power, dual power guarantee power supply and two electric wire netting add online uninterrupted power supply has been designed correspondingly, and use the electric wire netting power supply as the main, energy storage device power supply of energy storage system is for assisting, main and auxiliary combines, each other supplements, thereby guaranteed that the holistic control power supply of energy storage system supplies power reliably in succession, ensured that energy storage converter homoenergetic normally works no matter under any kind of mode. The overall reliability and economy of the energy storage system are improved.
While the foregoing is directed to embodiments of the present invention, other modifications and variations of the present invention may be devised by those skilled in the art in light of the above teachings. It should be understood by those skilled in the art that the foregoing detailed description is for the purpose of better explaining the present invention, and the scope of the present invention should be determined by the scope of the appended claims.
Claims (9)
1. An energy storage converter, comprising:
the power conversion units and the power supply units respectively correspond to the power conversion units;
the power conversion unit comprises a control module, an alternating current end of the power conversion unit is used for being connected with a first power grid, and a direct current end of the power conversion unit is used for being connected with an energy storage device; the control module is used for connecting the energy storage equipment; the control module comprises one or more of the following: the device comprises a unit controller, a battery management system and a signal sampling conversion module;
the power supply unit includes: the direct current power supply module, the first diode and the alternating current power supply module;
the input end of the direct current power supply sub-module is used for being connected with the energy storage equipment, and the output end of the direct current power supply sub-module is connected with the output end of the alternating current power supply sub-module in parallel to be connected with the control module of the power conversion unit after being connected with the first diode in series;
the input end of the alternating current power supply sub-module is used for being connected with the first power grid;
the direct current power supply module is used for outputting a first voltage to the control module of the power conversion unit, and the alternating current power supply module is used for outputting a second voltage to the control module of the power conversion unit; wherein the first voltage is less than the second voltage;
the energy storage converter further comprises: a grid-connected reactor;
the power conversion units are cascaded into a plurality of power conversion links;
the grid-connected reactor comprises a plurality of branches, the first end of each branch is respectively used for being connected with a port of one phase of the first power grid, and the second end of each branch is respectively connected with a power conversion link.
2. The energy storage converter according to claim 1, wherein the dc supply module comprises: a first fuse, a DC/DC module, a second fuse;
the first end of the first fuse is used for being connected with the positive pole of the energy storage device, and the second end of the first fuse is connected with the positive pole of the input end of the DC/DC module;
the first end of the second fuse is used for being connected with the negative pole of the energy storage device, and the second end of the second fuse is connected with the negative pole of the input end of the DC/DC module;
the positive pole of the output end of the DC/DC module is connected with the control module of the power conversion unit through the first diode, and the negative pole of the output end of the DC/DC module is directly connected with the control module of the power conversion unit.
3. The energy storage converter according to claim 1, wherein the ac power supply module comprises a first transformer and a rectifier module, the primary side of the first transformer is used for connecting to the first grid, the secondary side of the first transformer is connected to the ac terminal of the rectifier module, and the dc terminal of the rectifier module is connected to the control module of the power conversion unit.
4. The energy storage converter according to claim 1,
the power conversion unit further comprises a first switch, a second switch, a current-limiting resistor, an H-bridge circuit and an LCL circuit;
the first end of the first switch is used for being connected with the anode of the energy storage device, and the second end of the first switch is connected with the first end of the first inductor of the LCL circuit through the current-limiting resistor;
the first end of the second switch is used for being connected with the anode of the energy storage device, and the second end of the second switch is directly connected with the first end of the first inductor of the LCL circuit;
the second end of the first inductor is respectively connected with one end of a first capacitor of the LCL circuit and a first port of a direct current end of the H-bridge circuit;
the first end of the first inductor is used for being connected with the negative electrode of the energy storage device;
the second end of the second inductor is respectively connected with the other end of the first capacitor of the LCL circuit and the second port of the direct current end of the H-bridge circuit;
and the alternating current end of the H-bridge circuit is used for being connected with the first power grid.
5. Energy storage system, characterized in that the energy storage system comprises a first electricity network, a number of energy storage devices, an energy storage converter according to any of claims 1-4.
6. The system of claim 5, further comprising:
the heat dissipation device comprises a plurality of heat dissipation devices, a third switch, a second transformer, a fourth switch and a third transformer; each heat dissipation device corresponds to one or more power conversion units in the energy storage converter respectively;
the heat dissipation equipment supplies power for two paths, the first path is connected with the secondary side of the second transformer through the third switch, and the primary side of the second transformer is used for being connected with a second power grid independent of the first power grid; the second path is connected with the secondary side of the third transformer through the fourth switch, and the primary side of the third transformer is connected with the alternating current end in the energy storage converter.
7. The system of claim 6, further comprising: a grid-connected switch;
the energy storage converter is connected with the first power grid through a grid-connected switch.
8. The system of claim 7, further comprising:
the main controller is respectively connected with the control end of the grid-connected switch, the control module in each power conversion unit of the energy storage converter, the control end of the third switch and the control end of the fourth switch;
and the main power supply module is used for supplying power to a secondary circuit and a main controller, and the secondary circuit at least comprises the third switch and the fourth switch.
9. The system of claim 8, wherein the main power module comprises:
the primary side of the fourth transformer is used for connecting the first power grid and the second power grid which are connected in parallel, and the secondary side of the fourth transformer is connected with the first end of an online uninterrupted power supply; and the second end of the online uninterrupted power supply is used for connecting the main controller and the secondary loop.
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| CN201710812862.8A CN107612408B (en) | 2017-09-11 | 2017-09-11 | Energy storage converter and energy storage system |
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| CN201710812862.8A CN107612408B (en) | 2017-09-11 | 2017-09-11 | Energy storage converter and energy storage system |
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| CN109188156A (en) * | 2018-11-06 | 2019-01-11 | 威凡智能电气高科技有限公司 | A kind of high pressure direct screening energy accumulation current converter modular testing platform and test circuit |
| CN110201330A (en) * | 2019-06-03 | 2019-09-06 | 威凡智能电气高科技有限公司 | A kind of water fire fighting system and its control method for high pressure direct screening battery energy storage |
| CN110350648A (en) * | 2019-06-27 | 2019-10-18 | 芜湖康爱而电气有限公司 | Dual power supply uninterruptible power system suitable for energy accumulation current converter |
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