CN215580891U - Energy storage system - Google Patents
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- CN215580891U CN215580891U CN202120436049.7U CN202120436049U CN215580891U CN 215580891 U CN215580891 U CN 215580891U CN 202120436049 U CN202120436049 U CN 202120436049U CN 215580891 U CN215580891 U CN 215580891U
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Abstract
The application discloses an energy storage system. The energy storage system comprises a power electronic conversion unit, a first switch unit, an alternating current-direct current conversion branch circuit, a second switch unit and a direct current conversion branch circuit; the first end of the power electronic conversion unit is connected with the alternating current-direct current conversion branch circuit through the first switch unit; the second end of the power electronic conversion unit is connected with the direct current conversion branch circuit through a second switch unit; the power electronic conversion unit is used for rectifying the passing current under the condition that the first switch unit is communicated, and the alternating current and the direct current are converted through the alternating current-direct current conversion branch circuit; under the condition that the second switch unit is connected, the passing current is chopped, and the direct current is converted through the direct current conversion branch circuit. Based on the same power electronic conversion unit, AC/DC conversion and DC/DC conversion are realized, multiple devices do not need to be connected, the cost is lower, the size is smaller, the movement is convenient, multiple devices do not need to be coordinately controlled, the operation is simpler, and the reliability is higher.
Description
Technical Field
The application relates to the technical field of power electronics, in particular to an energy storage system.
Background
The commonly used transformations of energy storage systems at present are: alternating current/Direct current conversion (AC/DC conversion) and Direct current conversion (DC/DC conversion). Typically the above-described transformation is implemented using separate devices. Therefore, it is often the case that an energy storage system uses only one of the above transformations. If it is desired to use the above-mentioned conversion in combination in one energy storage system, it is necessary to connect the AC/DC conversion device and the DC/DC conversion device at the same time for multi-stage conversion, as shown in fig. 1. So, the equipment quantity of connecting is more among the energy storage system, and the cost is higher, and energy storage system is bulky, is not convenient for remove, is difficult to use and removes the energy storage field, and a plurality of devices are mutually independent among the energy storage system moreover, and the separate application, operation complexity such as system control, communication is higher, makes mistakes easily, and the reliability is not high.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present application is made to provide an energy storage system that overcomes or at least partially solves the above problems.
According to an aspect of the present application, an energy storage system is provided, which includes a power electronic conversion unit, a first switch unit, an ac/dc conversion branch, a second switch unit, and a dc conversion branch;
the first end of the power electronic conversion unit is connected with the alternating current-direct current conversion branch circuit through the first switch unit;
the second end of the power electronic conversion unit is connected with the direct current conversion branch circuit through the second switch unit;
the power electronic conversion unit is used for rectifying the passing current under the condition that the first switch unit is communicated, and the alternating current and the direct current are converted through the alternating current-direct current conversion branch circuit; and under the condition that the second switching unit is communicated, the passing current is chopped, and the direct current is converted through the direct current conversion branch circuit.
Optionally, the power electronic conversion unit includes a converter unit and a first filter unit;
the current transformation unit is connected with the first filtering unit in series;
the current transformation unit is used for rectifying the current flowing through the current transformation unit under the condition that the first switch unit is communicated, and transmitting the rectified current to the filtering unit; under the condition that the second switch unit is communicated, chopping processing is carried out on the current flowing through the second switch unit, and the chopped current is transmitted to the filtering unit;
the first filtering unit is used for receiving the rectified or chopped current transmitted by the current transformation unit and filtering out the melting wave in the rectified or chopped current.
Optionally, the energy storage system further comprises an energy storage unit;
the energy storage unit is used for providing electric energy for the energy storage system or storing the electric energy under the condition that the first switch unit or the second switch unit is closed.
Optionally, the current transforming unit comprises a plurality of insulated gate bipolar transistors;
the current transformation unit is used for transforming the direct current provided by the energy storage unit into alternating current to be transmitted to a load or transforming the alternating current provided by the load into direct current to be transmitted to the energy storage unit for energy storage by controlling the on or off of the insulated gate bipolar transistor under the condition that the first switch unit is communicated; and the power supply is used for converting the electric energy provided by the energy storage unit into direct current with other frequencies for output by controlling the on or off of the insulated gate bipolar transistor under the condition that the second switch unit is connected.
Optionally, the second switching unit comprises a third switch and a fourth switch;
one end of the third switch is connected with the power electronic conversion unit, and the other end of the third switch is connected with the fourth switch and used for converging the current chopped by the power electronic conversion unit;
and one end of the fourth switch is connected with the third switch, and the other end of the fourth switch is connected with a load and used for controlling the connection or disconnection of the power electronic conversion unit and the load.
Optionally, the energy storage system further comprises a soft start unit for controlling the energy storage system to start smoothly.
Optionally, the energy storage system further comprises a third switching unit;
one end of the third switch unit is connected with the energy storage unit, and the other end of the third switch unit is connected with the power electronic conversion unit;
the soft start unit is connected with the third switching unit in parallel and used for pre-charging the power electronic conversion unit before the third switching unit is closed, so that the voltage difference between the energy storage unit and the power electronic conversion unit is reduced.
Optionally, the energy storage system further comprises a second filtering unit;
one end of the second filtering unit is connected with the first switch unit and the second switch unit respectively, and the other end of the second filtering unit is connected with a load for further filtering out the melting wave in the current, so that the current is smoother.
Optionally, the first switch unit and the second switch unit cannot be closed simultaneously.
Optionally, the voltage class of the energy storage unit includes 1000V or 1500V.
According to the technical scheme, the power electronic conversion unit, the first switch unit, the alternating current-direct current conversion branch circuit, the second switch unit and the direct current conversion branch circuit are arranged in the energy storage system, the first end of the power electronic conversion unit is connected with the alternating current-direct current conversion branch circuit through the first switch unit, the second end of the power electronic conversion unit is connected with the direct current conversion branch circuit through the second switch unit, the power electronic conversion unit conducts rectification processing on passing current under the condition that the first switch unit is communicated, conversion between alternating current and direct current is achieved through the alternating current-direct current conversion branch circuit, chopping processing is conducted on the passing current under the condition that the second switch unit is communicated, and conversion between direct current is achieved through the direct current conversion branch circuit. The utility model provides an energy storage system is through closed different switches, make power electronics transform unit and alternating current-direct current transform branch road or direct current transform branch road intercommunication, synthesize and realize AC/DC transform and DC/DC transform, the realization of two kinds of transform functions is based on same power electronics transform unit, need not to connect many equipment, the system cost is lower, and make energy storage system's volume littleer, be convenient for remove, be applicable to more and remove the energy storage field, also need not many equipment coordination control, the operation is simpler, the reliability is higher.
The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.
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 application. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 illustrates a schematic diagram of a prior art energy storage system;
FIG. 2 illustrates a schematic diagram of an energy storage system according to an embodiment of the present application;
fig. 3 illustrates a circuit schematic of an energy storage system according to an embodiment of the present application.
Detailed Description
Exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application 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. 2 shows a schematic diagram of an energy storage system according to an embodiment of the present application. As shown in fig. 2, the energy storage system 200 includes a power electronic conversion unit 210, a first switching unit 220, an ac-dc conversion branch 230, a second switching unit 240, and a dc conversion branch 250.
A first end of the power electronic conversion unit 210 is connected to the ac-dc conversion branch 230 through the first switch unit 220; a second terminal of the power electronic conversion unit 210 is connected to the dc conversion branch 250 through the second switch unit 240.
The power electronic conversion unit 210 is configured to rectify a passing current and realize conversion between ac power and dc power through the ac-dc conversion branch 230 when the first switch unit 220 is connected; when the second switching unit 240 is turned on, the passing current is chopped, and the dc power is converted by the dc conversion branch 250.
To sum up, the energy storage system of this application makes power electronic conversion unit connect alternating current-direct current conversion branch road or direct current conversion branch road through the closure or the disconnection of control first switch unit and second switch unit, realizes AC/DC conversion and DC/DC conversion. The realization of two kinds of transform functions need not to connect many equipment based on same power electronic transform unit in this application, and system cost is lower, can make energy storage system's volume littleer moreover, is convenient for remove, is applicable to more and removes the energy storage field, also need not many equipment coordinated control, and the operation is simpler, and the reliability is higher.
The energy storage system can be applied to a multifunctional mobile energy storage scheme, for example, in a chargeable place of a power grid, the battery is charged by closing the first switch unit by using AC energy, the mobile energy storage can be transported to a required working place after being fully charged, and when a required load needs to be supplied with power, the direct current load is supplied with power by closing the second switch unit or the alternating current load is supplied with power by closing the first switch unit.
Fig. 3 illustrates a circuit schematic of an energy storage system according to an embodiment of the present application. As shown in fig. 3, the energy storage system 300 includes a power electronic conversion unit 310, a first switch unit 320, an ac/dc conversion branch, a second switch unit 330, and a dc conversion branch.
The power electronic conversion unit 310 and the first switch unit 320 form an ac/dc conversion branch, and the power electronic conversion unit 310 and the second switch unit 330 form a dc conversion branch.
A first end of the power electronic conversion unit 310 is connected with the ac-dc conversion branch through the first switch unit 320; a second terminal of the power electronic conversion unit 310 is connected to the dc conversion branch via the second switch unit 330.
The power electronic conversion unit 310 is configured to rectify a passing current and realize conversion between ac power and dc power through an ac-dc conversion branch when the first switch unit 320 is connected; when the second switching unit 330 is turned on, the passing current is chopped, and the conversion between the direct currents is realized through the direct current conversion branch.
In some embodiments of the present application, when the first switch unit 320 is connected and the second switch unit 330 is closed, the ac-dc conversion branch is connected, the first end of the power electronic conversion unit 310 is connected to the ac-dc conversion branch through the first switch unit 320, and the main controller controls the power electronic conversion unit 310 to rectify the flowing current, so as to achieve conversion between ac power and dc power. When the first switch unit 320 is closed and the second switch unit 330 is connected, the dc conversion branch is connected, the second end of the power electronic conversion unit 310 is connected to the dc conversion branch through the second switch unit 330, and the main controller controls the power electronic conversion unit 310 to perform chopping processing on the passing current, so as to realize conversion between dc currents.
The energy storage system of this embodiment based on same power electronics transform unit, through closed different switches, communicates alternating current-direct current transform branch road and direct current transform branch road respectively, synthesizes and realizes AC/DC transform and DC/DC transform, need not to connect many equipment, and the system cost is lower, can make energy storage system's volume littleer moreover, is convenient for remove, is applicable to more and removes the energy storage field, also need not many equipment coordination control, and the operation is simpler, and the reliability is higher.
It should be noted that, because the energy storage system of the present application comprehensively implements AC/DC conversion and DC/DC conversion based on the same power electronic conversion unit, and controls the power electronic conversion unit to rectify a flowing current in the case of AC/DC conversion, and controls the power electronic conversion unit to chop the flowing current in the case of DC/DC conversion, the same power electronic conversion unit cannot simultaneously rectify and chop the flowing current, and therefore, the power electronic conversion unit cannot simultaneously communicate an AC/DC conversion branch and a DC conversion branch, and the first switch unit 320 and the second switch unit 330 cannot be simultaneously closed.
In an embodiment of the present application, the power electronic converter unit 310 includes a converter unit 3101 and a first filter unit 3102, and the converter unit 3101 is connected in series with the first filter unit 3102.
The current transforming unit 3101, configured to, when the first switching unit 320 is connected, rectify the passing current and transmit the rectified current to the first filtering unit 3102; in the case where the second switching unit 330 is turned on, the passing current is chopped, and the chopped current is transmitted to the first filtering unit 3102.
The first filtering unit 3102 is configured to receive the rectified or chopped current transmitted by the converter unit 3101, and filter out a fused wave in the rectified or chopped current.
In some embodiments of the present application, the first switch unit 320 is closed, the second switch unit 330 is opened, the ac/dc conversion branch is connected, the current transforming unit 3101 rectifies a flowing current and transmits the rectified current to the first filtering unit 3102, and the first filtering unit 3102 filters out a high-frequency current melt wave in the current, so that the current is relatively smooth. The first switch unit 320 is turned off, the second switch unit 330 is turned on, the dc conversion branch is connected, the current transforming unit 3101 performs chopping on the current flowing through the dc conversion branch, and transmits the chopped current to the first filtering unit 3102, and the first filtering unit 3102 filters out the high-frequency current in the current to melt the current, so that the current is relatively smooth.
In some embodiments of the present application, the converter unit 3101 may adopt a two-level and three-phase full-bridge topology, or may use a three-level structure, such as a three-level inverter (NPC), TNPC, ANPC, and so on. The filter unit may use an LC filter circuit, an LCL filter circuit, three single-phase reactors, or a conjugate reactor, etc.
In an embodiment of the present application, the energy storage system 300 further includes an energy storage unit 340.
The energy storage unit 340 is configured to provide electric energy to the energy storage system 300 or store electric energy when the first switching unit 320 or the second switching unit 330 is closed.
In some embodiments of the present application, the first switch unit 320 is closed, the second switch unit 330 is opened, the power electronic conversion unit 310 is connected to the ac/dc conversion branch, the power electronic conversion unit 310 rectifies the current flowing through, the ac/dc conversion branch converts ac power into dc power, and the grid energy is stored in the energy storage unit 340, or the dc power is converted into ac power, and the electric energy stored in the energy storage unit 340 is delivered to the grid or provided to an ac load. The first switch unit 320 is opened, the second switch unit 330 is closed, the power electronic conversion unit 310 is communicated with the direct current conversion branch, the power electronic conversion unit 310 performs chopping processing on current flowing through, energy conversion from the DC high-voltage side to the DC low-voltage side is realized through the direct current conversion branch, and the energy stored by the energy storage unit 340 is provided for a direct current load, a direct current bus or another energy storage device such as a battery or a super capacitor.
In some embodiments of the present application, the energy storage unit 340 may be any energy storage device such as a battery, a super capacitor, and the like. In the case where the energy storage power source is a battery, the battery voltage level includes a 1000V or 1500V system level.
In one embodiment of the present application, the current transforming unit 3101 comprises a filter capacitor and a plurality of insulated gate bipolar transistors, as shown in fig. 3.
The current transformation unit 3101 is configured to, when the first switch unit 320 is connected, primarily filter the high-frequency molten waves on the dc side through the filter capacitor, and transform the dc power provided by the energy storage unit 340 into ac power to be transmitted to the load or transform the ac power provided by the load into dc power to be transmitted to the energy storage unit 340 for energy storage by controlling the on or off of the igbt; and is used for converting the electric energy provided by the energy storage unit 340 into direct current of other frequencies for output by controlling the on or off of the insulated gate bipolar transistor under the condition that the second switch unit 330 is connected.
In an embodiment of the present application, the second switch unit 330 in the energy storage system 300 includes a third switch S3 and a fourth switch S4.
One end of the third switch S3 is connected to the power electronic conversion unit 310, and the other end is connected to the fourth switch for converging the current chopped by the power electronic conversion unit.
One end of the fourth switch S4 is connected to the third switch, and the other end is connected to the load, for controlling the connection or disconnection of the power electronic conversion unit 310 to or from the load.
In some embodiments of the present application, the second switch unit 330 controls connection or disconnection of the power electronic conversion unit and the dc conversion branch through the third switch and the fourth switch, and other control manners may also be used to control connection or disconnection of the power electronic conversion unit and the dc conversion branch.
In an embodiment of the present application, the energy storage system 300 further includes a soft start unit 350 for controlling the energy storage system to start smoothly.
In an embodiment of the present application, the energy storage system 300 further includes a third switching unit 360.
One end of the third switching unit 360 is connected to the energy storage unit, and the other end is connected to the power electronic conversion unit 310.
The soft start unit 350 is connected in parallel with the third switching unit 360, and is used for pre-charging the power electronic conversion unit 310 before the third switching unit 360 is closed, so as to reduce the voltage difference between the energy storage unit 340 and the power electronic conversion unit 310.
In some embodiments of the present application, the soft start unit 350 is connected in parallel to the third switching unit 360, when the energy storage system 300 works, the filter capacitor of the converter unit 3101 may be pre-charged, the voltage difference between the energy storage unit 340 and the power electronic conversion unit 310 is reduced, and after the pre-charging is finished, the third switching unit 360 is closed, so that in the process of closing the third switching unit 360, the impact current flowing through the third switching unit 360 is relatively small, which plays a role in protecting the device, and if there is no pre-charging of the soft start unit 350, the impact current may be relatively large, which may easily damage the device.
In an embodiment of the present application, the energy storage system 300 further includes a second filtering unit.
One end of the second filtering unit is connected to the first switching unit 320 and the second switching unit 330, and the other end is connected to the load, so as to further filter out the melting wave in the current, and make the current smoother.
In some embodiments of the present application, the second filtering unit may employ a capacitor, and may also employ other filtering devices.
It should be noted that the switch in the above embodiments of the present application may be any kind of switch device, such as a circuit breaker, a multi-stage protection switch, a multi-functional protection switch, or a fuse and isolation switch.
While the foregoing is directed to embodiments of the present application, other modifications and variations of the present application 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 application, and the scope of protection of the present application shall be subject to the scope of protection of the claims.
Claims (10)
1. An energy storage system is characterized by comprising a power electronic conversion unit, a first switch unit, an alternating current-direct current conversion branch, a second switch unit and a direct current conversion branch;
the first end of the power electronic conversion unit is connected with the alternating current-direct current conversion branch circuit through the first switch unit;
the second end of the power electronic conversion unit is connected with the direct current conversion branch circuit through the second switch unit;
the power electronic conversion unit is used for rectifying the passing current under the condition that the first switch unit is communicated, and the alternating current and the direct current are converted through the alternating current-direct current conversion branch circuit; and under the condition that the second switching unit is communicated, the passing current is chopped, and the direct current is converted through the direct current conversion branch circuit.
2. The energy storage system of claim 1, wherein the power electronic conversion unit comprises a converter unit and a first filter unit;
the current transformation unit is connected with the first filtering unit in series;
the current transformation unit is used for rectifying the current flowing through the current transformation unit under the condition that the first switch unit is communicated, and transmitting the rectified current to the filtering unit; under the condition that the second switch unit is communicated, chopping processing is carried out on the current flowing through the second switch unit, and the chopped current is transmitted to the filtering unit;
the first filtering unit is used for receiving the rectified or chopped current transmitted by the current transformation unit and filtering out the melting wave in the rectified or chopped current.
3. The energy storage system of claim 1, further comprising an energy storage unit;
the energy storage unit is used for providing electric energy for the energy storage system or storing the electric energy under the condition that the first switch unit or the second switch unit is closed.
4. The energy storage system of claim 2 or 3, wherein the current transforming unit comprises a plurality of insulated gate bipolar transistors;
the current transformation unit is used for transforming the direct current provided by the energy storage unit into alternating current to be transmitted to a load or transforming the alternating current provided by the load into direct current to be transmitted to the energy storage unit for energy storage by controlling the on or off of the insulated gate bipolar transistor under the condition that the first switch unit is communicated; and the power supply is used for converting the electric energy provided by the energy storage unit into direct current with other frequencies for output by controlling the on or off of the insulated gate bipolar transistor under the condition that the second switch unit is connected.
5. The energy storage system of claim 1, wherein the second switching unit comprises a third switch and a fourth switch;
one end of the third switch is connected with the power electronic conversion unit, and the other end of the third switch is connected with the fourth switch and used for converging the current chopped by the power electronic conversion unit;
and one end of the fourth switch is connected with the third switch, and the other end of the fourth switch is connected with a load and used for controlling the connection or disconnection of the power electronic conversion unit and the load.
6. The energy storage system of claim 1, further comprising a soft start unit for controlling smooth start of the energy storage system.
7. The energy storage system according to claim 3 or 6, further comprising a third switching unit;
one end of the third switch unit is connected with the energy storage unit, and the other end of the third switch unit is connected with the power electronic conversion unit;
the soft start unit is connected with the third switching unit in parallel and used for pre-charging the power electronic conversion unit before the third switching unit is closed, so that the voltage difference between the energy storage unit and the power electronic conversion unit is reduced.
8. The energy storage system of claim 1, further comprising a second filtering unit;
one end of the second filtering unit is connected with the first switch unit and the second switch unit respectively, and the other end of the second filtering unit is connected with a load for further filtering out the melting wave in the current, so that the current is smoother.
9. The energy storage system of claim 1, wherein the first switching unit and the second switching unit cannot be closed simultaneously.
10. The energy storage system of claim 3, wherein the voltage class of the energy storage unit comprises 1000V or 1500V.
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| CN202120436049.7U CN215580891U (en) | 2021-02-26 | 2021-02-26 | Energy storage system |
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| CN202120436049.7U CN215580891U (en) | 2021-02-26 | 2021-02-26 | Energy storage system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112952944A (en) * | 2021-02-26 | 2021-06-11 | 广州智光储能科技有限公司 | Energy storage system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112952944A (en) * | 2021-02-26 | 2021-06-11 | 广州智光储能科技有限公司 | Energy storage system |
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