CN213093922U - Energy storage system - Google Patents
Energy storage system Download PDFInfo
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- CN213093922U CN213093922U CN202022159172.7U CN202022159172U CN213093922U CN 213093922 U CN213093922 U CN 213093922U CN 202022159172 U CN202022159172 U CN 202022159172U CN 213093922 U CN213093922 U CN 213093922U
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- direct current
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Abstract
The utility model provides an energy storage system relates to energy storage product technical field, energy storage system includes: a plurality of energy storage converters connected in parallel; each energy storage converter is connected with at least one battery pack; wherein each said energy storage converter comprises: an AC to DC module; the direct current-to-direct current module is connected with the direct current side of the alternating current-to-direct current module; and the direct current-to-direct current module in each energy storage converter is connected with each battery pack through a direct current bus. The utility model discloses a scheme can realize two-stage bidirectional conversion and switching operation battery package each other, and control system's total power has solved the problem of online insulation detection mutual interference, and the reliability of power supply is high moreover, and it is convenient to maintain.
Description
Technical Field
The utility model relates to an energy storage product technical field, in particular to energy storage system.
Background
The energy storage system is a solution which can be interacted with a power grid and can also be independently used for supplying power for an external load, and the power utilization problems that the power is not supplied enough in a power utilization peak and the electric energy is unstable and is cut off in time are solved. Moreover, the energy storage system can store electricity during the off-peak period of the electricity consumption and then supply power to and charge the power grid and the external load during the peak period of the electricity consumption, for example, the direct-current quick charging of an electric automobile is supported, and the electricity expenditure is saved. The existing energy storage system usually adopts a single-stage conversion energy storage converter, the access voltage range of a battery pack is narrow, each loop cannot be independently controlled, the maintenance is inconvenient, and the problems of mutual interference of online insulation detection of the battery pack and total power control are easy to occur.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides an energy storage system for there is the problem of insulating detection mutual interference in the energy storage system who solves the unipolar transform among the prior art.
In order to solve the above technical problem, an embodiment of the present invention provides the following technical solutions:
an energy storage system, comprising:
a plurality of energy storage converters connected in parallel;
each energy storage converter is connected with at least one battery pack;
wherein each said energy storage converter comprises: an AC to DC module; the direct current-to-direct current module is connected with the alternating current-to-direct current module;
and the direct current-to-direct current module in each energy storage converter is connected with each battery pack through a direct current bus.
Optionally, the ac-to-dc modules in each of the energy storage converters are connected in parallel to a first connection point.
Optionally, the energy storage system further comprises:
a second connection point connected to the first connection point by an AC bus, and at which a grid and an external load are connected in parallel.
Optionally, the energy storage system further comprises:
a first meter, one end of the first meter being connected to the external load and the other end being connected to the second connection point.
Optionally, a second meter is disposed between the first connection point and the second connection point.
Optionally, the energy storage system further comprises:
and each battery pack is connected with one power management unit.
Optionally, the energy storage system further comprises:
and the energy management system is respectively connected with the first gauge, the second gauge, the plurality of energy storage converters and each power supply management unit through communication lines.
Optionally, a control switch is disposed between the second meter and the first connection point.
The utility model has the advantages that:
the above embodiment of the utility model, energy storage converter among the energy storage system changes direct current module and direct current including exchanging, adopts two-way high frequency pulse width modulation technical control exchange change direct current module with direct current changes direct current module, realizes the two-stage transform. The direct current-to-direct current module is connected with at least one battery pack, the battery packs can be switched to operate in the application process, the total power of the system is controlled, the problem of mutual interference of on-line insulation detection of the parallel battery packs is solved, the power supply reliability is high, and the maintenance is convenient.
Drawings
Fig. 1 shows a schematic structural diagram of an energy storage system according to an embodiment of the present invention.
Description of reference numerals:
1-a battery pack; 2-an alternating current to direct current module; 3-a direct current to direct current module; 4-a direct current bus; 5-a first connection point; 6-a second connection point; 7-alternating current bus; 8-a power grid; 9-external load; 10-a first meter; 11-a second meter; 12-a power management system; 13-an energy management system; 14-a communication line; 15-control the switch.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The utility model discloses there is the problem of insulating detection mutual interference in the energy storage system to unipolar transform in the prior art, provides an energy storage system.
As shown in fig. 1, an embodiment of the present invention provides an energy storage system, including:
a plurality of PCS (Power Conversion System) connected in parallel;
a plurality of battery packs 1, wherein each PCS is connected with at least one battery pack 1;
wherein each of the PCS comprises: an AC-to-DC module 2; the direct current-to-direct current module 3 is connected with the alternating current-to-direct current module 2;
the dc-dc conversion module 3 in each PCS is connected to each battery pack 1 through a dc bus 4.
The above embodiment of the utility model, PCS among the energy storage system changes DC module 2 and direct current including exchanging, adopts two-way high frequency pulse width modulation technical control it changes DC module 2 with direct current changes DC module 3, realizes the two-stage transform, and power and electric current all adopt two closed-loop control to reach the purpose of high quality control active, idle output. The direct current-direct current module 3 is connected with at least one battery pack 1, each loop is independently controlled, and the circuits can be switched to operate in the application process, so that the problem of alarm caused by mutual interference of online insulation detection of the parallel battery packs 1 is solved, the total power and the current of a double closed-loop control system are adopted, wherein the total power of the alternating current side of the PCS is 360 KW. The energy storage system has the advantages of high power supply reliability and convenience in maintenance.
Specifically, the ac-to-dc conversion module 2 in each of the energy storage converters is connected in parallel to the first connection point 5.
Here, the ac side of the ac-dc module 2 is connected to the first connection point 5, and the dc side of the ac-dc module 2 is connected to at least one battery pack 1, and preferably, as shown in fig. 1, the dc side of the ac-dc module 2 is connected to the dc-dc module 3.
The utility model relates to a specific embodiment, energy storage system still includes:
a second connection point 6, said second connection point 6 being connected to said first connection point 5, 1 by means of an ac busbar 7 and at said second connection point 6, connecting in parallel a power grid 8 and an external load 9.
It should be noted that, the dc-to-dc module 3 raises the operating voltage of the battery pack 1 through boosting and rectifying, thereby improving the system efficiency. In this embodiment, a bidirectional isolation type dc-to-dc module 3 is adopted, and its main topology structure includes: the circuit comprises a forward circuit, a flyback circuit, a push-pull circuit, a half-bridge circuit and a full-bridge circuit. The bidirectional isolation type DC-DC module 3 not only plays a role in isolating voltage, but also can replace a transformer between a power grid 8 and the AC-DC module 2, and the power density of the energy storage system is improved. Two sides of the bidirectional isolation type direct current to direct current module 3 are provided with single-phase fully-controlled bridge transformers, so that the energy storage system can work in a zero-voltage mode, the charging and discharging efficiency of the energy storage system is improved, and modularization is easy to realize.
The utility model relates to a specific embodiment, energy storage system still includes:
a first meter 10, said first meter 10 being connected at one end to said external load 9 and at the other end to said second connection point 6.
Further, a second meter gauge 11 is arranged between the first connection point 5 and the second connection point 6.
It should be noted that the first meter 10 can be used for counting the power supply amount of the energy storage system to the external load 9. The second meter 11 can be used for counting the charging capacity of the energy storage system by the power grid 8.
The utility model relates to a specific embodiment, energy storage system still includes:
a plurality of PMU (Power Management Unit) 12, each of the battery packs 1 is connected to one of the PMU 12.
In this embodiment, each PMU 12 is connected to one battery pack 1, and monitors power connection and charging conditions of each battery pack 1, which is helpful for the PCS to select the battery pack 1 to realize switching operation in an application process.
The utility model relates to a specific embodiment, energy storage system still includes:
an EMS (Energy Management System) 13, wherein the EMS 13 is connected to the first meter 10, the second meter 11, the plurality of Energy storage converters and each PMU 12 through a communication line 14.
In this embodiment, a plurality of energy storage converters are connected in parallel and then communicate with the EMS 13 in a unified manner. The EMS 13 distributes charging and discharging of the energy storage system and realizes remote monitoring.
Further, a control switch 15 is provided between the second meter 11 and the first connection point 5.
Here, the charge and discharge operations of the energy storage system are controlled by the control switch 15.
It should be noted that the energy storage system adopts two-stage conversion PCS, and compared with a single-stage conversion PCS, the energy storage system has the advantages that the voltage range of the battery pack 1 on the direct current side can reach 400V to 700V, the ripple coefficient of the charging voltage is less than 0.5%, the power supply reliability is high, the maintenance is convenient, and the like. Specifically, the dc-dc conversion module 3 may boost the 357.7V voltage of the battery pack 1 to 750V, and the ac-dc conversion module 2 operates as a pulse width modulation inverter, inverts a dc power supply into 380V ac power, and injects the ac power into the power grid 8.
The foregoing is directed to the preferred embodiments of the present invention, and it will be understood by those skilled in the art that various changes and modifications may be made without departing from the principles of the invention, and that such changes and modifications are intended to be included within the scope of the invention.
Claims (8)
1. An energy storage system, comprising:
a plurality of energy storage converters connected in parallel;
a plurality of battery packs (1), wherein each energy storage converter is connected with at least one battery pack (1);
wherein each said energy storage converter comprises: an AC-to-DC module (2); the direct current-to-direct current module (3) is connected with the alternating current-to-direct current module (2);
and the direct current-direct current module (3) in each energy storage converter is connected with each battery pack (1) through a direct current bus (4).
2. Energy storage system according to claim 1, characterized in that the ac-to-dc modules (2) in each of the energy storage converters are connected in parallel to a first connection point (5).
3. The energy storage system of claim 2, further comprising:
a second connection point (6), said second connection point (6) being connected to said first connection point (5) by means of an alternating current bus (7), and at said second connection point (6), a power grid (8) and an external load (9) are connected in parallel.
4. The energy storage system of claim 3, further comprising:
a first meter (10), one end of the first meter (10) being connected to the external load (9) and the other end being connected to the second connection point (6).
5. Energy storage system according to claim 4, characterized in that a second meter (11) is arranged between the first connection point (5) and the second connection point (6).
6. The energy storage system of claim 5, further comprising:
a plurality of power management units (12), wherein each battery pack (1) is connected with one power management unit (12).
7. The energy storage system of claim 6, further comprising:
the energy management system (13) is connected with the first meter (10), the second meter (11), the plurality of energy storage converters and each power management unit (12) through communication lines (14).
8. Energy storage system according to claim 5, characterized in that a control switch (15) is arranged between the second meter (11) and the first connection point (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022159172.7U CN213093922U (en) | 2020-09-27 | 2020-09-27 | Energy storage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022159172.7U CN213093922U (en) | 2020-09-27 | 2020-09-27 | Energy storage system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213093922U true CN213093922U (en) | 2021-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022159172.7U Active CN213093922U (en) | 2020-09-27 | 2020-09-27 | Energy storage system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213093922U (en) |
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2020
- 2020-09-27 CN CN202022159172.7U patent/CN213093922U/en active Active
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