CN214255824U - Uninterrupted power supply circuit and energy storage system - Google Patents
Uninterrupted power supply circuit and energy storage system Download PDFInfo
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- CN214255824U CN214255824U CN202022917141.3U CN202022917141U CN214255824U CN 214255824 U CN214255824 U CN 214255824U CN 202022917141 U CN202022917141 U CN 202022917141U CN 214255824 U CN214255824 U CN 214255824U
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Abstract
The application discloses an uninterruptible power supply circuit and an energy storage system, wherein the uninterruptible power supply circuit comprises a first power supply branch and a second power supply branch; the first power supply branch is used for converting commercial power into direct current and supplying the direct current to a load and the second power supply branch; and the second power supply branch is used for supplying power to the load under the condition that the output voltage of the first power supply branch is less than or equal to the first preset voltage. This application realizes the multichannel power supply through first power supply branch road and second power supply branch road to the load power supply, further guarantees the normal work of load.
Description
Technical Field
The utility model relates to an uninterrupted power supply technical field, concretely relates to uninterrupted power supply circuit and energy storage system.
Background
The load of the existing energy storage system is generally only supplied with power from a system distribution box singly, and the distribution box gets power from a mains supply power grid, so that when the mains supply is abnormal, the load is forced to cut off the power supply and stop running, and the energy storage system cannot work normally.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned defects or shortcomings in the prior art, it is desirable to provide an uninterruptible power supply circuit and an energy storage system, which implement uninterruptible power supply to a load and ensure normal operation of the load to implement normal operation of the energy storage system.
In a first aspect, the present invention provides an uninterruptible power supply circuit, including:
the power supply device comprises a first power supply branch and a second power supply branch;
the first power supply branch is used for converting commercial power into direct current and supplying the direct current to a load and the second power supply branch;
and the second power supply branch is used for supplying power to the load under the condition that the output voltage of the first power supply branch is less than or equal to the first preset voltage.
As an optional solution, the second power supply branch includes:
a first power supply unit and a second power supply unit;
when the output voltage of the first power supply unit is greater than or equal to the output voltage of the second power supply unit, the first power supply unit is used for supplying power to the load and the second power supply unit;
the second power supply unit is used for supplying power to the load under the condition that the output voltage of the first power supply unit is less than or equal to a second preset voltage;
alternatively, the first and second electrodes may be,
when the output voltage of the second power supply unit is greater than or equal to the output voltage of the first power supply unit, the second power supply unit is used for supplying power to a load;
and the first power supply unit is used for supplying power to the load and the second power supply unit when the output voltage of the second power supply unit is less than or equal to a second preset voltage.
Optionally, the first power supply branch includes an AC/DC rectifier, an AC input end of the AC/DC rectifier is connected to the commercial power, and a DC output end of the AC/DC rectifier is connected to the load and the second power supply unit, respectively.
Optionally, the first power supply branch further includes a first controllable switch, one end of the first controllable switch is connected to the AC/DC rectifier, and the other end of the first controllable switch is connected to the load and the second power supply unit.
Alternatively, the first controllable switch is a diode, and the anode of the diode is connected with the direct current output end of the AC/DC rectifier.
Optionally, the first power supply unit includes an energy storage unit and a DC/DC converter, one end of the converter is connected to an external power supply, a DC output end of the energy storage unit is connected to a DC input end of the DC/DC converter, and a DC output end of the DC/DC converter is connected to the load and the second power supply unit.
As an optional scheme, the first power supply unit further includes a converter, an ac input end of the converter is connected to the commercial power, and a dc output end of the converter is connected to a dc input end of the energy storage unit.
Optionally, the first power supply unit further includes a second controllable switch, one end of the second controllable switch is connected to the DC/DC converter, and the other end of the second controllable switch is connected to the load and the second power supply unit.
Alternatively, the second controllable switch is a diode, and the anode of the diode is connected with the direct current output end of the DC/DC converter.
Alternatively, the energy storage unit is a battery cluster.
Optionally, the second power supply unit includes a dc UPS and a battery connected to the dc UPS.
In a second aspect, the present application provides an energy storage system, including the uninterruptible power supply circuit of the first aspect and a controller, the controller being configured as a load, the controller being configured to control an operating state of the energy storage system.
According to the uninterruptible power supply circuit, the load is supplied with power through the first power supply branch and the second power supply branch, and the first power supply branch and the second power supply branch are connected with commercial power, so that multi-path power supply is realized; the first power supply branch and the second power supply branch are beneficial to further ensuring the normal work of the load.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic structural diagram of an uninterruptible power supply circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an uninterruptible power supply circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a first operation mode of an uninterruptible power supply circuit according to an embodiment of the present invention;
fig. 4 is a structural schematic diagram of a second operation mode of an uninterruptible power supply circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a third operation mode of an uninterruptible power supply circuit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a fourth operation mode of the uninterruptible power supply circuit according to an embodiment of the present invention;
fig. 7 is a power supply flow chart of an uninterruptible power supply circuit according to an embodiment of the present invention.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not limiting of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The uninterrupted power supply circuit is used for supplying power for a key load, the uninterrupted power supply circuit internally comprises an auxiliary power supply device, the load is guaranteed to use the auxiliary power supply device inside to supply power for the load when a main power supply fails, and uninterrupted power supply of the load is achieved.
The embodiment of the application provides an uninterrupted power supply circuit can be applicable to the field that needs the power supply such as photovoltaic power generation, track traffic, battery charging outfit. The uninterruptible power supply circuit is suitable for supplying power to the control part of the energy storage system and can also be used as an independent power supply.
An embodiment of the present application provides an uninterruptible power supply circuit, as shown in fig. 1 and 2, including:
a first power supply branch 200 and a second power supply branch 300;
a first power supply branch 200 for converting the commercial power into a direct current to be supplied to a load 400 and a second power supply branch 300;
the second power supply branch 300 is configured to supply power to the load 400 when the output voltage of the first power supply branch 200 is less than or equal to a first predetermined voltage;
specifically, one end of the first power supply branch 200 is connected to the mains supply, and the other end of the first power supply branch 200 is connected to the load 400;
one end of the second power supply branch 300 is connected to the commercial power, and the other end of the second power supply branch 300 is connected to the load 400.
It should be noted that, in the following description,
the first power supply branch 200 and the second power supply branch 300 are respectively connected to the utility power, wherein the utility power connected to the first power supply branch 200 and the second power supply branch 300 may be from the same substation or from different substations. When the commercial power comes from the same transformer substation and the commercial power is lost, the electric energy can be fed back to the commercial power grid, and normal operation of other alternating-current loads in the commercial power grid is guaranteed.
The input voltage of the commercial power is generally 480V ac, and may be other voltage classes according to actual needs, which is not specifically limited in this embodiment of the present application.
The second power supply branch 300 may be a device (e.g., a storage battery, a lithium battery, etc.) charged by commercial power, and various converters, etc.; but also other devices for generating electrical energy, such as fuel cells, etc., and various converters, etc.
The second power supply branch 300 may include a battery or a battery pack; a battery cluster may also be included; the embodiments of the present application do not limit this.
The second power supply branch 300 may also be connected to other loads to supply power to the other loads.
It is understood that, according to actual needs, the first power supply branch 200 can supply power to the load 400 and also supply power to the second power supply branch 300; for example, when the first power supply branch and the second power supply branch are connected to different commercial power, and the commercial power connected to the second power supply branch 300 is abnormal, the first power supply branch 200 supplies power to at least a part of the second power supply branch 300 in order to ensure normal operation of other loads.
The first predetermined voltage may be any value less than the voltage (24V, or 24V + 10%) required by the load 400, for example, 20V, or 0; at this time, the commercial power may be in a power-off state or the voltage input to the first power supply branch 200 is low; the load 400 is supplied with power through the second power supply branch 300 to ensure that the load 400 operates normally.
It will be appreciated that the above-described,
the first power supply branch 200, the second power supply branch 300, and the commercial power are configured as a power supply side, and the load 400 is configured as a power consumption side. In order to guarantee the service life of the second power supply branch 300 and the normal operation of other loads connected to the second power supply branch 300, the power supply on the power utilization side is disconnected when the SOC of the second power supply branch 300 is lower than a threshold value, for example, 50%.
The uninterrupted power supply circuit of the embodiment of the application supplies power to the load through the first power supply branch and the second power supply branch, the first power supply branch and the second power supply branch are connected with the mains supply, multi-path power supply is achieved, and the first power supply branch and the second power supply branch are favorable for further guaranteeing normal work of the load.
As an implementation manner, as shown in fig. 2, the second power supply branch 300 includes:
a first power supply unit 310 and a second power supply unit 320;
when the output voltage of the first power supply unit 310 is greater than or equal to the output voltage of the second power supply unit 320, the first power supply unit 310 is configured to supply power to the load 400 and the second power supply unit 320;
a second power supply unit 320 for supplying power to the load 400 in a state where the output voltage of the first power supply unit 310 is less than or equal to a second predetermined voltage; alternatively, the first and second electrodes may be,
when the output voltage of the second power supply unit 320 is greater than or equal to the output voltage of the first power supply unit 310, the second power supply unit 320 is configured to supply power to the load 400;
the first power supply unit 310 is configured to supply power to the load 400 and the second power supply unit 320 when the output voltage of the second power supply unit 320 is equal to or less than a second predetermined voltage.
It is understood that, for any power utilization system, such as the energy storage system, the first power supply unit 310 may be a main power supply unit of the energy storage system to supply power to all power utilization loads in the energy storage system; the second power supply unit 320 is used as a standby power supply unit, and is used for providing buffering and reducing loss when the SOC of the first power supply unit is low or the commercial power is abnormal.
It should be noted that the second predetermined voltage may be any value that is less than the voltage required by the load 400 and is less than the first power supply unit 310(24V or 24V + 5%), for example, 20V; wherein the second predetermined voltage is less than the first predetermined voltage.
It can be understood that, when the output voltage of the first power supply unit 310 is greater than or equal to the output voltage of the second power supply unit 320, the first power supply unit 310 preferentially supplies power to the load, and simultaneously stores energy and charges the second power supply unit 320, which is beneficial to smoothly switching power supply to the first power supply unit 310 to get power after the second power supply unit 320 black-starts the system.
When the output voltage of the second power supply unit 320 is greater than or equal to the output voltage of the first power supply unit 310, the second power supply unit 320 preferentially supplies power to the load, which is beneficial to providing buffer when the utility power grid fluctuates abnormally, preventing the second power supply unit 320 from discharging frequently, ensuring that the SOC of the second power supply unit 320 is in a good state, ensuring that other power loads connected with the second power supply unit 320 work normally, and reducing other fault problems caused by the abnormal utility power.
According to the scheme of the embodiment, the load can be further ensured to work normally, and other faults in the circuit can be avoided.
As an implementation manner, as shown in fig. 2, the first power supply branch 200 further includes an AC/DC rectifier 201, an AC input end of the AC/DC rectifier 201 is connected to the utility power, and a DC output end of the AC/DC rectifier 201 is connected to the load 400 and the second power supply unit 320, respectively.
Wherein, the output voltage of the AC/DC rectifier 201 is higher than the output voltage of the DC UPS 101.
In an implementation manner, the first power supply branch 200 further includes a first controllable switch, one end of the first controllable switch 201 is connected to the AC/DC rectifier 201, and the other end of the first controllable switch is connected to the load 400.
Wherein the first controllable switch is used to control the first power supply branch 200 output voltage and prevent reverse current. The first controllable switch may be a diode, a MOS transistor, and a combination of MOS transistors, for example: BJT (current-mode fully controlled device), IGBT (voltage-mode fully controlled device), MCT (voltage-mode fully controlled device), and the like. This embodiment is not particularly limited thereto.
In a specific embodiment, the first controllable switch is a diode D1, and the anode of the diode D1 is connected to the DC output terminal of the AC/DC rectifier 201, so that the structure is simple and the reverse current is prevented from flowing into the power grid.
As an implementation manner, as shown in fig. 2, the first power supply unit 310 includes an energy storage unit 311, a converter 312 and a DC/DC converter 313, an ac input terminal of the converter 312 is connected to the utility power, a DC output terminal of the converter 312 is connected to a DC input terminal of the energy storage unit 311, a DC output terminal of the energy storage unit 311 is connected to a DC input terminal of the DC/DC converter 313, and a DC output terminal of the DC/DC converter 313 is connected to the load 400 and the second power supply unit 320.
The energy storage unit 311 may be a device charged by commercial power, such as a storage battery, a lithium battery, etc.; but also other devices for generating electrical energy, such as fuel cells and the like.
The energy storage unit 311 may be a battery or a battery pack; but also a battery cluster; the embodiments of the present application do not limit this.
The energy storage unit 311 may also be connected to other loads to supply power to the other loads.
The converter is a Power Conversion System (PCS), and can control the charging and discharging processes of the energy storage unit 311 to perform ac/dc Conversion, and can directly supply Power to an ac load when the utility Power is lost. Besides the main circuit (rectifier circuit, inverter circuit, ac conversion circuit and dc conversion circuit respectively), the converter also needs a trigger circuit (or called drive circuit) for controlling the on/off of the power switch element and a control circuit for regulating and controlling the electric energy.
In an implementation manner, the first power supply unit 310 further includes a second controllable switch, one end of the second controllable switch is connected to the DC/DC converter 313, and the other end of the second controllable switch is connected to the load 400 and the second power supply unit 320.
The output voltage of the DC/DC converter 313 is lower than the output voltage of the DC UPS.
Wherein the second controllable switch is used for the output voltage of the energy storing unit 311 and prevents reverse current. The second controllable switch may be a diode, a MOS transistor, and a combination of MOS transistors, for example: BJT (current-mode fully controlled device), IGBT (voltage-mode fully controlled device), MCT (voltage-mode fully controlled device), and the like. This embodiment is not particularly limited thereto.
In a specific embodiment, the second controllable switch is a diode D2, and the anode of the diode D2 is connected to the DC output terminal of the DC/DC converter 313. Simple structure prevents that reverse current from flowing into the electric wire netting.
As an implementation manner, the uninterruptible power supply circuit may further include a control unit, wherein the control unit may serve as a load of the uninterruptible power supply circuit; the control unit may also be a control unit independent of the uninterruptible power supply circuit.
The control unit may be configured to detect a working state of the utility power, SOC information of the energy storage unit 311, and electric quantity information of the second power supply unit 320, and further control the first power supply branch 200 to convert ac power of the utility power into dc power to supply power to the load 400 and charge the second power supply unit 320 when the utility power is normal;
the control unit is configured to control the second power supply branch 300 to supply power to the load 400 when the output voltage of the first power supply branch 200 is lower than a first predetermined voltage.
The control unit is configured to control the first power supply unit 310, and when the output voltage of the first power supply branch 200 is lower than a first predetermined voltage, and the output voltage of the first power supply unit 310 is greater than or equal to the output voltage of the second power supply unit 320, the first power supply unit 310 preferentially supplies power to a load and performs energy storage and charging on the second power supply unit 320.
The control unit is configured to control the first power supply unit 310, and when the output voltage of the first power supply branch 200 is lower than a first predetermined voltage, and the output voltage of the second power supply unit 320 is greater than or equal to the output voltage of the first power supply unit 310, the second power supply unit 320 preferentially supplies power to the load.
As an implementation manner, the energy storage unit 311 is a battery cluster, and the output voltage of the battery cluster is 1500 VDC.
As an implementable manner, as shown in fig. 2, the second power supply unit 320 includes a dc UPS321 and a storage battery 322 connected to the dc UPS 321.
The dc UPS321 (dc UPS) is a dc UPS composed of an ac power distribution unit, a rectifier module, a battery, a dc power distribution unit, a battery management unit, and a monitoring module. The charging device is used for providing a stable direct current power supply for the electric load 400 and simultaneously charging the storage battery 322, and can automatically discharge through the storage battery 322 after the mains supply fails to output a direct current power supply uninterruptedly.
In this embodiment, the dc UPS is configured to respond to the power loss signal after the commercial power grid loses power, rectify and stabilize the output voltage of the storage battery 322, and then provide the rectified voltage to the load 400, so as to ensure that the load 400 normally operates.
For example, when the uninterruptible power supply circuit supplies power to the control device of the energy storage system, the power supply flow is as shown in fig. 7:
the controller judges whether the mains supply is normal, under the normal condition of the mains supply, the first power supply branch 200 gets power from a mains supply power grid, the input voltage of the mains supply is 480V alternating current, the alternating current is rectified and reduced to 24VDC through the AC/DC rectifier, because the output voltage of the AC/DC rectifier is higher than the output voltage of the direct-current UPS, the diode D1 is conducted, the diode D2 is cut off, all distribution currents are ensured to come from the AC/DC rectifier, the first power supply branch supplies power to the control device, meanwhile, the storage battery is charged through the direct-current UPS, and the distribution direction is shown by an arrow in figure 3.
When the mains supply is in power failure, the input voltage output by the AC/DC rectifier is lost, the direct current UPS triggers a power failure loss signal, no input voltage exists at the diode D1, the diode D1 is cut off, the direct current UPS is quickly switched to be powered by the storage battery after detecting the mains supply loss signal, the output voltage of the direct current UPS is higher than the output voltage of the DC/DC converter, therefore, the diode D2 is cut off, the storage battery with 24VDC directly supplies power for the control device after passing through the direct current UPS, and the power distribution direction is shown as an arrow in figure 4.
When the commercial power is lost for a long time and the electric quantity of the storage battery is insufficient, at the moment, the input voltage output by the AC/DC rectifier is still lost, no input voltage still exists at the position of the diode D1, and the diode D1 is cut off; the output voltage of the DC UPS is reduced, even the DC UPS is shut down for protection, so that the diode D2 is turned on, the second power supply branch works to take power from the battery cluster, and the power is stepped down and stabilized to 24VDC by the DC/DC converter, and then is supplied to the control device, and the battery is charged by the DC UPS101, and the power distribution direction is as shown by the arrow in fig. 5.
When the power failure time of the mains supply is long, and the controller detects that the SOC value of the battery cluster is lower than a threshold value (or a protection value), the controller actively controls the system to stop and disconnect the power utilization side interface, and unnecessary life attenuation or other faults caused by overdischarge of the battery cluster are avoided.
When the commercial power connected with the first power supply branch and the second power supply branch is from the same transformer substation, the battery cluster outputs alternating voltage through inversion of the converter to support a commercial power grid, and other alternating current loads on the side of the commercial power grid can normally operate. Such as other ac loads included in the energy storage system, for example, an HAVC (air conditioner), etc., to ensure proper operation of the heat dissipation and other devices of the energy storage system, the direction of power distribution is shown by the arrows in fig. 6.
In summary, according to the uninterruptible power supply circuit, the load is supplied with power through the first power supply branch and the second power supply branch, and the first power supply branch and the second power supply branch are connected with the mains supply, so that multi-path power supply is realized; and the second power supply branch comprises a first power supply unit and a second power supply unit, the first power supply unit can charge the second power supply unit, and the first power supply unit and the second power supply unit can respectively supply power to the load, so that the normal work of the load is further ensured, the over-discharge of the first power supply unit is protected, and the fault problem is reduced.
And moreover, the controllable switch is arranged, so that reverse current is prevented, and meanwhile, the energy storage unit realizes black start, so that the power grid voltage is provided, and the normal operation of the whole system is ensured.
In a second aspect, embodiments of the present application provide an energy storage system, including the uninterruptible power supply circuit of the first aspect and a controller, where the controller is configured as a load, and the controller is configured to control an operating state of the energy storage system. Through the uninterrupted power supply circuit of the first aspect, the first power supply branch is adopted to charge the second power supply unit while supplying power to the controller, and when the commercial power is lost, the first power supply unit or the second power supply unit is selected to supply power to the controller according to the output voltage of the first power supply unit and the second power supply unit, so that the normal work of the controller of the energy storage system is ensured, and the reliability of the system is improved. Thus, the energy storage system has all of the features and advantages of the thermal management system described above, and will not be described herein again.
It is to be understood that the terms "first" and "second" as referred to above are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be understood by those skilled in the art that the scope of the present invention is not limited to the specific combination of the above-mentioned features, but also covers other embodiments formed by any combination of the above-mentioned features or their equivalents without departing from the spirit of the present invention. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (12)
1. An uninterruptible power supply circuit, comprising:
the power supply device comprises a first power supply branch and a second power supply branch;
the first power supply branch is used for converting commercial power into direct current to be supplied to a load and the second power supply branch;
the second power supply branch is used for supplying power to the load when the first power supply branch is smaller than or equal to a first preset voltage state.
2. The circuit of claim 1, wherein the second supply branch comprises: a first power supply unit and a second power supply unit;
when the output voltage of the first power supply unit is greater than or equal to the output voltage of the second power supply unit, the first power supply unit is used for supplying power to the load and the second power supply unit;
the second power supply unit is used for supplying power to the load when the output voltage of the first power supply unit is less than or equal to a second preset voltage;
alternatively, the first and second electrodes may be,
when the output voltage of the second power supply unit is greater than or equal to the output voltage of the first power supply unit, the second power supply unit is used for supplying power to the load;
the first power supply unit is used for supplying power to the load and the second power supply unit when the output voltage of the second power supply unit is less than or equal to a second preset voltage.
3. The circuit according to claim 2, wherein the first power supply branch comprises an AC/DC rectifier, an AC input terminal of the AC/DC rectifier is connected to the mains supply, and a DC output terminal of the AC/DC rectifier is connected to the load and the second power supply unit, respectively.
4. The circuit of claim 3, wherein the first power branch further comprises a first controllable switch, one end of the first controllable switch is connected to the AC/DC rectifier, and the other end of the first controllable switch is connected to the load and the second power supply unit.
5. The circuit of claim 4, wherein the first controllable switch is a diode, and wherein an anode of the diode is connected to the DC output of the AC/DC rectifier.
6. The circuit of claim 2, wherein the first power supply unit comprises an energy storage unit and a DC/DC converter, a DC output terminal of the energy storage unit is connected to a DC input terminal of the DC/DC converter, and a DC output terminal of the DC/DC converter is connected to the load and the second power supply unit.
7. The circuit of claim 6, wherein the first power supply unit further comprises a current transformer, an ac input of the current transformer is connected to the commercial power, and a dc output of the current transformer is connected to a dc input of the energy storage unit.
8. The circuit of claim 6, wherein the first power supply unit further comprises a second controllable switch, one end of the second controllable switch is connected to the DC/DC converter, and the other end of the second controllable switch is connected to the load and the second power supply unit.
9. The circuit of claim 8, wherein the second controllable switch is a diode, and wherein an anode of the diode is connected to the DC output of the DC/DC converter.
10. The circuit of claim 6, wherein the energy storage unit is a battery cluster.
11. The circuit of any of claims 2-10, wherein the second power supply unit comprises a dc UPS and a battery coupled to the dc UPS.
12. An energy storage system comprising the uninterruptible power supply circuit of any of claims 1 to 11 and a controller, the controller being configured as the load, the controller being configured to control an operating state of the energy storage system.
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