CN218472840U - Uninterrupted power supply device, power supply equipment and emergency power supply system - Google Patents
Uninterrupted power supply device, power supply equipment and emergency power supply system Download PDFInfo
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- CN218472840U CN218472840U CN202222464800.1U CN202222464800U CN218472840U CN 218472840 U CN218472840 U CN 218472840U CN 202222464800 U CN202222464800 U CN 202222464800U CN 218472840 U CN218472840 U CN 218472840U
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Abstract
The utility model discloses an uninterrupted power supply device, power supply unit and emergency power supply system, power supply unit includes: an energy storage battery unit; the energy storage converter is connected with the energy storage battery unit; the alternating current bus is connected with the energy storage converter; a generator connected to the AC bus; the grid-connected stability control unit is used for consuming redundant alternating current output by the energy storage converter in the process of switching the energy storage converter into the current source mode according to the condition that the discharge capacity of the energy storage battery unit is lower than a preset electric quantity signal. The problem of load outage caused by shutdown of the generator when the battery energy storage unit is connected with the generator in a grid mode is solved, and normal work of the load is guaranteed.
Description
Technical Field
The embodiment of the utility model provides a relate to the power supply technology field, especially relate to an uninterrupted power supply device, power supply unit and emergent power supply system.
Background
With the increasing of the high-sensitivity power electronic equipment in all industries in the current society, more and more users have continuously improved requirements on power supply reliability, and the research on developing intelligent uninterruptible power supply devices has important significance in order to guarantee the uninterruptible power supply of key loads, reduce related loss and achieve the purpose of intelligent uninterruptible power supply device research.
Fig. 1 is a schematic structural diagram of an uninterruptible Power supply apparatus provided in the prior art, and referring to fig. 1, the present uninterruptible Power supply apparatus includes an energy storage battery unit 10, a Power Conversion System (PCS) 50, and a generator 20. The working logic of the system comprises the following steps: during discharging, the control switch K1 is turned off, the energy storage converter PCS serves as a power supply to convert the dc power of the energy storage battery unit 10 into ac power, and the ac power is supplied to the external load 30 through the ac bus L, and at this time, the energy storage converter 50 operates in a voltage source mode. When the energy storage battery unit 10 runs out of power, the generator 20 is started, the control switch K1 is closed, and the system is connected to the generator, at this time, the energy storage converter 50 is switched from the voltage source mode to the current source mode, and is synchronous with the generator 20 in terms of parameters such as voltage, frequency and phase, but stops discharging, and the generator 20 discharges to support the external load 30 to continue working. The generator 20 may be a diesel engine.
In the above process, at the moment when the control switch K1 is closed and the energy storage converter 50 is converted into a current source, the energy storage converter 50 should adjust its output current to 0, so that the output of the generator 20 supports the external load 30. However, due to errors of sampling components and control errors, the energy storage converter 50 may be difficult to stably adjust the current to 0, and may output a small current, and at this time, if the external load 30 is small or even has no load, the current may flow into the generator 20, trigger the reverse power protection of the generator 20, cause the generator 20 to stop, and power off of the external load 30, which affects the normal operation of the external load 30.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides an uninterrupted power supply device, power supply unit and emergency power supply system to the problem that appears the generator and shut down and lead to the load outage when solving battery energy storage unit and being incorporated into the power networks with the generator guarantees that the load can normally work.
According to the utility model discloses an aspect provides an uninterrupted power supply device, include:
an energy storage battery unit;
the energy storage converter is connected with the energy storage battery unit;
the alternating current bus is connected with the energy storage converter; the working modes of the energy storage converter comprise a voltage source mode and a current source mode; the energy storage converter is used for converting direct current emitted by the energy storage battery unit into alternating current to be supplied to the alternating current bus when in a voltage source mode; when the energy storage converter is in a current source mode, the energy storage converter is used for converting alternating current on the alternating current bus into direct current to be supplied to the energy storage battery unit for charging; the alternating current bus is also used for being connected with an external load so as to supply power to the external load;
a generator connected to the AC bus; the generator is used for providing alternating current to the alternating current bus when the energy storage battery unit stops discharging so as to supply power to the external load uninterruptedly;
and the grid-connected stability control unit is respectively connected with the alternating current bus and the energy storage battery unit, and is used for consuming redundant alternating current output by the energy storage converter in the process of switching the energy storage converter into the current source mode according to the condition that the discharge capacity of the energy storage battery unit is lower than a preset electric quantity signal.
Optionally, the grid-connected stability control unit includes an adjustable resistive load, an intelligent ammeter and a controller; the adjustable resistance load is connected with the alternating current bus; the intelligent electric meter is connected between the alternating current bus and the external load in series; the controller is respectively connected with the energy storage battery unit, the adjustable resistance load and the intelligent electric meter;
the controller is used for collecting external load power detected by the intelligent ammeter after receiving a signal that the discharge capacity sent by the energy storage battery unit is lower than a preset electric quantity, and sending a starting signal to the adjustable resistance load when the external load power is lower than the preset power; the adjustable resistance load is used for starting work after receiving a starting signal sent by the controller so as to consume redundant alternating current output in the process of switching the energy storage converter into the current source mode.
Optionally, the controller is further connected to the energy storage converter, and the controller is configured to send a current source mode switching signal to the energy storage converter after receiving a start success signal fed back by the adjustable resistive load, so as to trigger the energy storage converter to switch to a current source mode;
the energy storage converter is also connected with the generator and is also used for sending a starting signal to the generator after receiving the current source mode switching signal so as to control the generator to start.
Optionally, the controller is further connected to the energy storage converter, and the controller is configured to send a current source mode switching signal to the energy storage converter after receiving a start success signal fed back by the adjustable resistive load, so as to trigger the energy storage converter to switch to a current source mode;
the controller is further connected with the generator and is further used for sending a starting signal to the generator after receiving a starting success signal fed back by the adjustable resistance load so as to control the generator to start.
Optionally, the controller is further configured to send a stop signal to the adjustable resistive load after receiving the successful mode switching signal fed back by the energy storage converter, so as to control the adjustable resistive load to stop working.
Optionally, the energy storage battery unit includes:
the lithium battery pack is connected with the battery management system unit, and the controller is connected with the battery management system unit;
the battery management system unit is used for collecting the discharge capacity of the lithium battery pack and sending a signal that the discharge capacity is lower than a preset electric quantity to the controller when the discharge capacity of the lithium battery pack is lower than the preset electric quantity.
Optionally, the uninterruptible power supply device is characterized by further including a control switch, a first end of the control switch is connected to the ac bus, and a second end of the control switch is connected to the generator.
Optionally, the generator comprises a diesel generator.
According to the utility model discloses a further aspect provides a power supply unit, including external load and the utility model discloses any embodiment uninterrupted power supply unit, the alternating current generating line with external load connects to supply power to external load.
According to the utility model discloses a further aspect provides an emergency power supply system, including external load and the utility model discloses any embodiment uninterrupted power supply unit, uninterrupted power supply unit be used for under emergency to the external load power supply.
The embodiment of the utility model provides a technical scheme has add the stability control unit that is incorporated into the power networks in uninterrupted power supply device, is connected with alternating current generating line, energy storage battery unit respectively, and the stability control unit that is incorporated into the power networks is used for being less than according to energy storage battery unit's discharge capacity and predetermines the electric quantity signal, consumes energy storage converter switches into the unnecessary alternating current of current source mode in-process output. The generator is started to supply power to the alternating current bus, and the energy storage converter is converted into the current source, so that even if the energy storage converter outputs small current in an uncontrolled manner, the current can be prevented from flowing into the generator, the reverse power protection function of the generator is prevented from being triggered, the load is prevented from being powered off, the problem that the power of the load is powered off due to the fact that the generator is shut down when a battery energy storage unit is connected with the generator is solved, and the load can work normally.
It should be understood that the statements herein are not intended to identify key or critical features of any embodiment of the present invention, nor are they intended to limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an uninterruptible power supply apparatus provided in the prior art;
fig. 2 is a schematic structural diagram of an intermittent power supply device provided by an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another intermittent power supply device according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
The embodiment of the utility model provides an uninterrupted power supply device, fig. 2 is the utility model discloses an uninterrupted power supply device's that provides structural schematic diagram refers to fig. 2, and uninterrupted power supply device includes:
an energy storage battery cell 10;
the energy storage converter 50, the energy storage converter 50 is connected with the energy storage battery unit 10;
the alternating current bus L is connected with the energy storage converter 50; the energy storage converter 50 is used for converting the direct current discharged by the energy storage battery unit 10 into alternating current to be supplied to the alternating current bus L when being in a voltage source mode; the energy storage converter 50 is used for converting the alternating current on the alternating current bus L into direct current to be supplied to the energy storage battery for charging when being in a current source mode; the ac bus L is also connected to an external load 30, and is used to supply power to the external load 30;
a generator 20, wherein the generator 20 is connected with an alternating current bus L; the generator 20 is used for supplying alternating current to the alternating current bus L when the energy storage battery unit 10 stops discharging so as to supply power to the external load 30 uninterruptedly;
and the grid-connected stability control unit 40 is respectively connected with the alternating current bus L and the energy storage battery unit 10, and the grid-connected stability control unit 40 is used for consuming redundant alternating current output by the energy storage converter 50 in the process of switching to the current source mode according to the condition that the discharge capacity of the energy storage battery unit 10 is lower than a preset electric quantity signal.
Specifically, the uninterruptible power supply includes an energy storage battery unit 10, an energy storage converter 50, an ac bus L, a generator 20, and a grid-connected stability control unit. The energy storage Battery unit 10 may include a lithium Battery pack and a Battery Management System (BMS) unit, that is, the Battery in the energy storage Battery unit 10 may be a lithium Battery. The energy storage converter 50 can control the charging and discharging processes of the lithium battery to perform alternating current and direct current conversion. In the case where the generator 20 is not started, the energy storage battery unit 10 supplies power to a load (external load 30) via the ac bus L. The energy storage converter 50 is composed of a DC/AC bidirectional converter, an internal control unit, and the like. The control unit receives the control command through communication, and controls the DC/AC bidirectional converter to charge or discharge the battery according to the sign and the magnitude of power in the power command. The control unit communicates with the BMS battery management system through the CAN interface to acquire the state information of the battery pack, realize the protective charging and discharging of the battery and ensure the safe operation of the battery.
The energy storage converter 50 includes two modes of operation, a voltage source mode and a current source mode. When the energy storage battery unit 10 is full of electricity, the energy storage battery unit 10 is in a discharge state, and the energy storage converter 50 is in a voltage source mode. The energy storage converter 50 converts the dc power discharged from the energy storage battery cells 10 into ac power to supply to the ac bus L to supply power to the external load 30 through the ac bus L. When the energy storage battery unit 10 runs out of power, the generator 20 is started, and at this time, the energy storage converter 50 is switched from the voltage source mode to the current source mode, and is synchronous with the generator 20 in terms of voltage, frequency, phase and other parameters, but stops discharging, and the generator 20 discharges to support the external load 30 to continue working. Further, when the generator 20 is in operation, the energy storage converter 50 may detect the power of the external load 30 in real time, and when the power of the external load is smaller than the optimal efficiency power of the generator 20, the energy storage battery unit 10 may be charged to keep the generator 20 at the optimal efficiency all the time, and when the energy storage battery unit 10 is fully charged, the generator 20 may be deactivated to reduce energy consumption. For example, the generator 20 is a diesel generator 20, and when the energy storage battery unit 10 is fully charged, the diesel generator 20 can be deactivated to reduce diesel consumption.
On this basis, the uninterruptible power supply apparatus further includes a grid-connection stabilization control unit 40. The grid-connected stability control unit 40 is respectively connected with the alternating current bus L and the energy storage battery unit 10, and the grid-connected stability control unit 40 is used for consuming redundant alternating current output by the energy storage converter 50 in the process of switching to the current source mode according to the condition that the discharge capacity of the energy storage battery unit 10 is lower than a preset electric quantity signal.
That is, if the power of the external load 30 is greater than the preset power, the external load 30 may consume the uncontrolled current output by the energy storage converter 50 during the switching to the current source mode, and at this time, the grid connection is normal. If the power of the external load 30 is smaller than the predetermined power, and the external load 30 cannot consume the uncontrolled current output by the energy storage converter 50 during the switching to the current source mode, the grid stability control unit 40 consumes the redundant ac power output by the energy storage converter 50 during the switching to the current source mode. In the moment that the generator 20 starts to supply power to the alternating current bus L and the energy storage converter 50 is converted into a current source, even if the energy storage converter 50 outputs a small current in an uncontrolled manner, the current can be ensured not to flow into the generator 20, and the reverse power protection function of the generator 20 is prevented from being triggered, so that the problem of load power failure caused by shutdown of the generator 20 when the battery energy storage unit is connected with the generator 20 is solved, the external load 30 cannot be powered off, and the normal work of the external load 30 is ensured.
The embodiment of the utility model provides a continuous power supply unit has add the stable control unit that is incorporated into the power networks, and the stable control unit that is incorporated into the power networks is connected with alternating current generating line, energy storage battery unit respectively, and the stable control unit that is incorporated into the power networks is used for being less than according to energy storage battery unit's discharge capacity and predetermines the electric quantity signal, consumes energy storage converter switches into the unnecessary alternating current of current source mode in-process output. The generator is started to supply power to the alternating current bus, and the energy storage converter is converted into the current source, so that even if the energy storage converter outputs small current in an uncontrolled manner, the current can be prevented from flowing into the generator, the reverse power protection function of the generator is prevented from being triggered, the load is prevented from being powered off, the problem that the power of the load is powered off due to the fact that the generator is shut down when a battery energy storage unit is connected with the generator is solved, and the load can work normally.
In an embodiment of the present invention, referring to fig. 3, the grid-connected stability control unit includes an adjustable resistive load R, a smart meter Z, and a controller 41; the adjustable resistance load R is connected with the alternating current bus L; the intelligent electric meter Z is connected between the alternating current bus L and the external load 30 in series; the controller 41 is respectively connected with the energy storage battery unit 10, the adjustable resistance load R and the intelligent ammeter Z; the controller 41 is configured to collect external load power detected by the smart meter Z after receiving a signal that the discharge amount sent by the energy storage battery unit 10 is lower than a preset electric quantity, and send a start signal to the adjustable resistive load R when the external load power is lower than the preset power; the adjustable resistive load R starts to operate after receiving a start signal sent by the controller 41, so as to consume the redundant alternating current output by the energy storage converter 50 during the switching to the current source mode.
It is understood that when the discharge amount of the energy storage battery unit 10 is lower than the preset charge amount, a signal that the discharge amount is lower than the preset charge amount is sent to the controller 41. The controller 41 is configured to detect the power of the external load 30 through the smart meter Z after receiving the signal that the discharged amount sent by the energy storage battery unit 10 is lower than the preset electric quantity. If the power of the external load 30 is greater than the preset power, the external load 30 may consume the uncontrolled current output by the energy storage converter 50 during the switching to the current source mode, and at this time, the grid connection is performed normally. If the power of the external load 30 is less than the preset power, the external load 30 cannot consume the uncontrolled current output by the energy storage converter 50 in the process of switching to the current source mode, the controller 41 sends a start signal to the adjustable resistive load R, the adjustable resistive load R starts after receiving the start signal sent by the controller 41, and consumes the redundant alternating current output by the energy storage converter 50 in the process of switching to the current source mode. In the moment that the generator 20 starts to supply power to the alternating current bus L and the energy storage converter 50 is converted into a current source, even if the energy storage converter 50 outputs a small current in an uncontrolled manner, the current can be ensured not to flow into the generator 20, and the reverse power protection function of the generator 20 is prevented from being triggered, so that the problem of load power failure caused by shutdown of the generator 20 when the battery energy storage unit is connected with the generator 20 is solved, the external load 30 cannot be powered off, and the normal work of the external load 30 is ensured.
In the uninterruptible power supply device provided by the embodiment of the utility model, the grid-connected stability control unit comprises an adjustable resistance load, an intelligent ammeter and a controller; the adjustable resistance load is connected with the alternating current bus; the intelligent electric meter is connected between the alternating current bus and an external load in series; the controller is respectively connected with the energy storage battery unit, the adjustable resistance load and the intelligent ammeter; the controller is used for collecting external load power detected by the intelligent ammeter after receiving a signal that the discharge quantity sent by the energy storage battery unit is lower than a preset electric quantity, and sending a starting signal to the adjustable resistive load when the external load power is lower than the preset power; the adjustable resistance load is started after receiving a starting signal sent by the controller so as to consume redundant alternating current output in the process of switching the energy storage converter into the current source mode. In the moment that the generator starts to supply power to the alternating-current bus and the energy storage converter is converted into the current source, even if the energy storage converter outputs small current in an uncontrolled manner, the current can be prevented from flowing into the generator, the reverse power protection function of the generator is prevented from being triggered, and external loads can not be powered off, so that the problem that the power of the load is powered off due to the fact that the generator stops when a battery energy storage unit is connected with the generator is solved, and the load can work normally.
In an embodiment of the present invention, referring to fig. 3, the controller 41 is further connected to the energy storage converter 50, and the controller 41 is configured to send a current source mode switching signal to the energy storage converter 50 after receiving the start success signal fed back by the adjustable resistive load R, so as to trigger the energy storage converter 50 to switch to the current source mode;
the energy storage converter 50 is further connected to the generator 20 (not shown), and the energy storage converter 50 is further configured to send a start signal to the generator 20 after receiving the current source mode switching signal, so as to control the start of the generator 20.
It can be understood that, during the discharging process of the energy storage battery unit 10, before the power is about to be exhausted, the energy storage battery unit 10 sends a signal that the discharged power is lower than the preset power to the controller 41 in advance. The controller 41 collects the power value of the smart meter Z to determine the power of the external load 30 after receiving the signal. If the collected power value of the smart meter Z is smaller than the preset threshold, it indicates that the power of the external load 30 is smaller. At this time, the controller 41 sends a start signal to the adjustable resistive load R to control the adjustable resistive load R to start. Wherein the power of the adjustable resistive load R is set to be greater than the power generated by the uncontrolled current output by the energy storage converter 50.
After the controller 41 controls the adjustable resistive load R to start, a current source mode switching signal is sent to the energy storage converter 50, and the energy storage converter 50 converts the system into the generator 20 to supply power according to a normal flow. The energy storage converter 50 may be connected to the generator 20, and in a process that the energy storage converter 50 converts the system into the power supply of the generator 20 according to a normal flow, the energy storage converter 50 may send a start signal to the generator 20 after receiving the current source mode switching signal, so as to control the start of the generator 20. At this time, if the energy storage converter 50 outputs an uncontrolled current, the uncontrolled current will be consumed by the adjustable resistive load R and will not flow into the generator 20, thereby avoiding triggering the reverse power protection function thereof and ensuring that the external load 30 will not be powered off.
In addition, after the energy storage converter 50 completes the switching action and enters the stable charging working state, a mode switching success signal can be sent to the controller 41; the controller 41 is further configured to send a stop signal to the adjustable resistive load R after receiving the successful mode switching signal fed back by the energy storage converter 50, so as to control the adjustable resistive load R to stop working. It can be understood that, after the energy storage converter 50 completes the switching action, it starts to charge the energy storage battery unit 10, enters a stable working state, and no longer generates an uncontrolled current, at this time, the controller 41 turns off the adjustable resistive load R to save electric energy, and the whole switching process is ended. The system provided by the utility model is automatic control, all can use the energy storage converter 50 and the generator 20 of any model, can not change the original framework and the parameter of system.
In another embodiment of the present invention, the controller 41 is connected to the energy storage converter 50, and the controller 41 is configured to send a current source mode switching signal to the energy storage converter 50 after receiving a start success signal fed back by the adjustable resistive load R, so as to trigger the energy storage converter 50 to switch to the current source mode; the controller 41 is further connected to the generator 20, and the controller 41 is further configured to send a start signal to the generator 20 after receiving the start success signal fed back by the adjustable resistive load R, so as to control the generator 20 to start. It is understood that the controller 41 may be connected to the generator 20, and when controlling the generator 20 to start, the controller 41 may switch the system to supply power to the generator 20 according to a normal flow.
Alternatively, referring to fig. 2 and 3, the energy storage battery cell 10 includes:
the lithium battery pack is connected with the battery management system unit, and the controller 41 is connected with the battery management system unit; the battery management system unit is used for collecting the discharging information of the lithium battery pack and sending a signal that the discharging amount is lower than the preset electric quantity to the controller 41 when the discharging amount of the lithium battery pack is lower than the preset electric quantity.
Optionally, referring to fig. 2 and 3, the uninterruptible power supply further includes a control switch K1, a first end of the control switch K1 is connected to the ac bus L, and a second end of the control switch is connected to the generator 20. The control terminal of the control switch K1 may be connected to the controller 41, or to the energy storage converter 50, or to other control components.
Specifically, when the energy storage battery unit 10 is discharged, the control switch K1 is turned off, and the energy storage converter 50 serves as a power supply to convert the direct current of the lithium battery into alternating current for the external load 30 to use. Before the energy storage battery unit 10 is about to be exhausted, the energy storage battery unit 10 sends a signal that the discharge capacity is lower than the preset capacity to the controller 41 in advance. The controller 41 collects the power value of the smart meter Z to determine the power of the external load 30 after receiving the signal. If the collected power value of the intelligent electric meter Z is smaller than the preset threshold value, the controller 41 sends a starting signal to the adjustable resistive load R at this time to control the adjustable resistive load R to start.
After the controller 41 controls the adjustable resistive load R to start, a current source mode switching signal is sent to the energy storage converter 50 to trigger the energy storage converter 50 to switch to the current source mode. The control switch K1 adopts a soft switching device and can be closed under the control of the energy storage converter 50, the generator 20 is connected into the system, seamless switching can be achieved in the whole process, and the work of load can not be interrupted. At this time, if the energy storage converter 50 outputs an uncontrolled current, the uncontrolled current will be consumed by the adjustable resistive load R and will not flow into the generator 20, thereby avoiding triggering the reverse power protection function thereof and ensuring that the external load 30 will not be powered off. After the energy storage converter 50 completes the switching action, the energy storage battery unit 10 starts to be charged, enters a stable working state, and no uncontrolled current is generated any more, at this time, the controller 41 closes the adjustable resistive load R to save electric energy, and the whole switching process is finished.
The embodiment of the utility model provides a still provide a power supply unit, including external load and the utility model discloses arbitrary embodiment uninterrupted power supply unit, the alternating current generating line is connected with external load to supply power to external load. Have the same technical effect and are not described in detail herein.
The embodiment of the utility model provides an emergent power supply system is still provided, including external load and the utility model discloses arbitrary embodiment uninterrupted power supply unit, uninterrupted power supply unit is used for supplying power to external load under emergency. Have the same technical effect and are not described in detail herein.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. An uninterruptible power supply device, comprising:
an energy storage battery unit;
the energy storage converter is connected with the energy storage battery unit;
the alternating current bus is connected with the energy storage converter; the working modes of the energy storage converter comprise a voltage source mode and a current source mode; the energy storage converter is used for converting direct current emitted by the energy storage battery unit into alternating current to be supplied to the alternating current bus when in a voltage source mode; when the energy storage converter is in a current source mode, the energy storage converter is used for converting alternating current on the alternating current bus into direct current to be supplied to the energy storage battery unit for charging; the alternating current bus is also used for being connected with an external load so as to supply power to the external load;
a generator connected to the ac bus, the generator configured to provide ac power to the ac bus when the energy storage battery unit stops discharging, so as to provide uninterrupted power to the external load;
and the grid-connected stability control unit is respectively connected with the alternating current bus and the energy storage battery unit, and is used for consuming redundant alternating current output by the energy storage converter in the process of switching the energy storage converter into the current source mode according to the condition that the discharge capacity of the energy storage battery unit is lower than a preset electric quantity signal.
2. The uninterruptible power supply apparatus according to claim 1,
the grid-connected stability control unit comprises an adjustable resistance load, an intelligent ammeter and a controller; the adjustable resistance load is connected with the alternating current bus; the intelligent electric meter is connected between the alternating current bus and the external load in series; the controller is respectively connected with the energy storage battery unit, the adjustable resistance load and the intelligent electric meter;
the controller is used for collecting external load power detected by the intelligent ammeter after receiving a signal that the discharge capacity sent by the energy storage battery unit is lower than a preset electric quantity, and sending a starting signal to the adjustable resistance load when the external load power is lower than the preset power; the adjustable resistance load is used for starting work after receiving a starting signal sent by the controller so as to consume redundant alternating current output in the process of switching the energy storage converter into the current source mode.
3. The uninterruptible power supply apparatus according to claim 2,
the controller is further connected with the energy storage converter and used for sending a current source mode switching signal to the energy storage converter after receiving a starting success signal fed back by the adjustable resistance load so as to trigger the energy storage converter to switch to a current source mode;
the energy storage converter is also connected with the generator and is also used for sending a starting signal to the generator after receiving the current source mode switching signal so as to control the generator to start.
4. The uninterruptible power supply apparatus according to claim 2,
the controller is further connected with the energy storage converter and used for sending a current source mode switching signal to the energy storage converter after receiving a starting success signal fed back by the adjustable resistance load so as to trigger the energy storage converter to switch to a current source mode;
the controller is further connected with the generator and is further used for sending a starting signal to the generator after receiving a starting success signal fed back by the adjustable resistance load so as to control the generator to start.
5. The uninterruptible power supply device according to claim 3 or 4, wherein the controller is further configured to send a stop signal to the adjustable resistive load after receiving the mode switching success signal fed back by the energy storage converter, so as to control the adjustable resistive load to stop operating.
6. The uninterruptible power supply of claim 2, wherein the energy storage battery unit comprises:
the lithium battery pack is connected with the battery management system unit, and the controller is connected with the battery management system unit;
the battery management system unit is used for collecting the discharge capacity of the lithium battery pack and sending a signal that the discharge capacity is lower than a preset electric quantity to the controller when the discharge capacity of the lithium battery pack is lower than the preset electric quantity.
7. The uninterruptible power supply of claim 1, further comprising a control switch, a first end of the control switch being coupled to the ac bus and a second end of the control switch being coupled to the generator.
8. The uninterruptible power supply of claim 1, wherein the generator comprises a diesel generator.
9. A power supply apparatus comprising an external load and the uninterruptible power supply device according to any one of claims 1 to 8, wherein the ac bus is connected to the external load to supply power to the external load.
10. An emergency power supply system comprising an external load and an uninterruptible power supply apparatus as claimed in any one of claims 1 to 8 for supplying power to the external load in an emergency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222464800.1U CN218472840U (en) | 2022-09-15 | 2022-09-15 | Uninterrupted power supply device, power supply equipment and emergency power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222464800.1U CN218472840U (en) | 2022-09-15 | 2022-09-15 | Uninterrupted power supply device, power supply equipment and emergency power supply system |
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| CN218472840U true CN218472840U (en) | 2023-02-10 |
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| CN202222464800.1U Active CN218472840U (en) | 2022-09-15 | 2022-09-15 | Uninterrupted power supply device, power supply equipment and emergency power supply system |
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- 2022-09-15 CN CN202222464800.1U patent/CN218472840U/en active Active
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