Alternating current electrical coupling cabinet

Abstract

An AC electrical coupling cabinet disclosed by the present invention comprises a cabinet body, and a switch module and an energy storage module which are arranged in the cabinet body, the switch module comprises an ATS unit and an STS unit, the input side of the ATS unit is used for being connected with a power supply module, and the energy storage module comprises at least two PCS units and energy storage batteries connected with each PCS unit. The power supply side of the STS unit is connected with the output side of the ATS unit, the two PCS units are connected to the power utilization side of the STS unit in parallel through an alternating current bus, and the power supply module comprises a mains supply unit and a power distribution unit; when the ATS unit detects that the power supply capacity of the mains supply unit is smaller than a first preset capacity, the ATS unit and the STS unit are switched to an off-grid state, and the PCS unit controls the energy storage battery to supply power to a load connected with the alternating current bus; and when the STS unit detects that the battery capacity of the energy storage battery is smaller than a second preset capacity, the ATS unit controls the power distribution unit to start. The device can automatically supply follow current power to a load for a long time.

Description

Technical Field

[0001] The present invention relates to the field of energy storage electrical appliances, and particularly to an AC electrical coupling cabinet. Background Art

[0002] As a power distribution cabinet, a coupling cabinet can realize many functions such as power distribution, supplement, and metering, and is an important part of the power system.

[0003] In order to supply power to a load for a long time, many current power distribution cabinets have a freewheeling function. However, the freewheeling of most power distribution cabinets is carried out through a backup power supply. When both the backup power supply and the mains power fail, freewheeling cannot be achieved, and the load cannot be supplied with continuous power for a long time or automatically. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide an AC electrical coupling cabinet that can automatically supply continuous power to a load for a long time.

[0005] The purpose of the present invention is achieved by adopting the following technical solutions:

[0006] An AC electrical coupling cabinet includes a cabinet body, a switch module, and an energy storage module disposed in the cabinet body. The switch module includes an ATS unit and an STS unit. The input side of the ATS unit is used to connect to a power module. The energy storage module includes at least two PCS units and energy storage batteries connected to each PCS unit. The power supply side of the STS unit is connected to the output side of the ATS unit. Two PCS units are connected in parallel to the power consumption side of the STS unit through an AC bus. Among them, the power module includes a mains unit and a power distribution unit;

[0007] When the ATS unit detects that the power supply capacity of the mains unit is less than a first preset capacity, the STS unit switches to the off-grid state, and the PCS unit controls the energy storage battery to supply power to the load connected to the AC bus; when the STS unit detects that the battery capacity of the energy storage battery is less than a second preset capacity, the ATS unit controls the power distribution unit to start; when the electrical parameters detected by the ATS unit for the power distribution unit are the same as the electrical parameters output by the PCS unit detected by the STS unit, the ATS unit controls the power distribution unit, and the PCS unit controls the energy storage battery to supply power to the load, where the electrical parameters include voltage and phase.

[0008] Preferably, when the power supply capacity of the mains unit detected by the ATS unit is greater than or equal to the first preset capacity, the STS unit switches to the grid-connected state, and the ATS unit controls the mains unit to supply power to the load; when the battery capacity of the energy storage battery detected by the STS unit is greater than or equal to the second preset capacity, the PCS unit controls the energy storage battery to supply power to the load.

[0009] Preferably, when the capacity change value of the mains unit is greater than a, the STS controls the ATS to select the power distribution unit or the PCS to select the energy storage battery to supply power to the load; when the capacity change value of the mains unit is less than or equal to a, the STS controls the ATS to select the mains unit or the PCS unit to select the energy storage battery to supply power to the load; the capacity change value = |instantaneous capacity - first preset capacity| / first preset capacity.

[0010] Preferably, when the energy storage battery capacity ratio is greater than or equal to b, the PCS unit controls the energy storage battery to discharge and supply power to the load; when the energy storage battery capacity ratio is less than b, the STS controls the mains unit or the power distribution unit to charge the energy storage battery; the capacity ratio = existing battery capacity / second preset capacity.

[0011] Preferably, the STS unit includes a bidirectional thyristor and an inductor CT for sensing voltage or electricity. The bidirectional thyristor is electrically connected to the inductor CT and the ATS respectively, and the inductor CT is electrically connected to the power supply module and the energy storage module respectively.

[0012] Preferably, the cabinet includes a control board, a switch and an indicator light. The switch, the indicator light and the STS unit are electrically connected to the control board respectively.

[0013] Preferably, the cabinet further includes a mains electricity meter, a power distribution electricity meter and a load electricity meter. The mains electricity meter, the power distribution electricity meter and the load electricity meter are respectively electrically connected to the mains unit, the power distribution unit and the load through the inductor CT.

[0014] Preferably, the ATS unit includes a bidirectional selection switch with two input terminals. One input terminal of the bidirectional selection switch is electrically connected to the mains unit, the other input terminal of the bidirectional selection switch is electrically connected to the power distribution unit, and the output terminal of the bidirectional selection switch is electrically connected to the STS unit.

[0015] Preferably, the AC electrical coupling cabinet further includes a circuit breaker QF1, a circuit breaker QF2, and an electric circuit breaker QF3. One input terminal of the bidirectional selector switch is electrically connected to the mains unit through the QF1, the other input terminal of the bidirectional selector switch is electrically connected to the power distribution unit through the circuit breaker QF2, and the output terminal of the bidirectional selector switch is electrically connected to the STS unit through the electric circuit breaker QF3.

[0016] Preferably, the PCS unit includes a soft start circuit, an inverter unit, an AC filter unit, and a grid-connected relay that are electrically connected in sequence. The soft start circuit is electrically connected to the energy storage battery, and the grid-connected relay is electrically connected to the STS unit.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] The disclosed AC electrical coupling cabinet of the present application includes a power supply module and an energy storage module. The power supply module includes a power distribution unit and a mains unit. When both the power distribution unit and the mains unit are free of faults, the power supply module can supply power to the load. When the ATS unit detects that the power supply capacity of the mains unit is less than a first preset capacity, that is, when the mains unit fails, the ATS unit can select the power distribution unit or the PCS unit to control the energy storage battery to supply power to the load; when the STS unit detects that the battery capacity of the energy storage battery is less than a second preset capacity, the energy storage battery is out of power, and the ATS unit controls the power distribution unit to start charging the energy storage battery and supplying power to the load; when the electrical parameters detected by the ATS unit for the power distribution unit are consistent with the electrical parameters output by the PCS unit detected by the STS unit, that is, the electrical parameters of the energy storage battery are consistent with the electrical parameters of the power distribution unit, the energy storage battery is fully charged, and the energy storage battery can also supply power to the load, thereby achieving the purpose of automatically and continuously supplying power to the load for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional structural schematic diagram of the AC electrical coupling cabinet of the present invention;

[0020] Figure 2 is a planar structural schematic diagram of the AC electrical coupling cabinet of the present invention;

[0021] Figure 3 is a principle block diagram of the AC electrical coupling cabinet of the present invention;

[0022] Figure 4 is a principle structural schematic diagram of the AC electrical coupling cabinet of the present invention;

[0023] Figure 5 is a principle block diagram of another embodiment of the AC electrical coupling cabinet of the present invention;

[0024] Figure 6 It is a schematic circuit diagram of the PCS of the AC electrical coupling cabinet of the present invention.

[0025] In the figure: 100, AC electrical coupling cabinet; 10, cabinet body; 11, control board; 12, indicator light; 13, switch; 14, cabinet door; 15, wire hole; 16, signal interface; 17, mains electricity meter; 18, distribution electricity meter; 19, load electricity meter; 20, circuit breaker; 21, load switch; 22, transformer. Specific embodiments

[0026] In order to more clearly understand the specific technical solutions, features and advantages of the present invention, the present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0027] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0028] Embodiment 1

[0029] As Figures 1 - 3As shown in the figure, an AC electrical coupling cabinet 100 disclosed in the present application includes a cabinet body 10 and a switch module and an energy storage module arranged in the cabinet body 10. The switch module includes an ATS unit and an STS unit. The input side of the ATS unit is used to connect to a power supply module. The energy storage module includes at least two PCS units and energy storage batteries connected to each PCS unit. The power supply side of the STS unit is connected to the output side of the ATS unit. Two PCS units are connected in parallel to the power consumption side of the STS unit through an AC bus. Among them, the power supply module includes a commercial power unit and a power distribution unit. When the ATS unit detects that the power supply capacity of the commercial power unit (power supply grid) is less than a first preset capacity, the STS unit switches to an off-grid state, and the PCS unit controls the energy storage battery to supply power to the load connected to the AC bus. When the STS unit detects that the battery capacity of the energy storage battery is less than a second preset capacity, the ATS unit controls the power distribution unit to start. When the electrical parameters detected by the ATS unit of the power distribution unit are consistent with the electrical parameters output by the PCS unit detected by the STS unit, the ATS unit controls the power distribution unit, and the PCS unit controls the energy storage battery to supply power to the load. Among them, the electrical parameters include voltage and phase.

[0030] In the above embodiment, the AC electrical coupling cabinet 100 includes a power supply module and an energy storage module. The power supply module includes a power distribution unit and a commercial power unit. When the power supply module has no faults, both the power distribution unit or the commercial power unit can supply power to the load. When the ATS unit detects that the power supply capacity of the commercial power unit is less than a first preset capacity (normal power supply capacity), that is, when the commercial power unit fails, the ATS unit can select the power distribution unit or the PCS unit to control the energy storage battery to supply power to the load. When the STS unit detects that the battery capacity of the energy storage battery is less than a second preset capacity (normal stored power of the energy storage battery), the energy storage battery is out of power, and the ATS unit controls the power distribution unit to start to charge the energy storage battery and supply power to the load. When the electrical parameters detected by the ATS unit of the power distribution unit are consistent with the electrical parameters output by the PCS unit detected by the STS unit, that is, the electrical parameters of the energy storage battery are consistent with the electrical parameters of the power distribution unit, the energy storage battery completes charging and reaches the second preset capacity again, and the energy storage battery can also supply power to the load, so as to achieve the purpose of automatically and continuously supplying power to the load in the long term (flexibly).

[0031] Among them, when the ATS unit detects that the power supply capacity of the mains unit is greater than or equal to the first preset capacity, the mains unit is normal, the STS unit switches to the grid-connected state, and the ATS unit controls the mains unit to supply power to the load; when the STS unit detects that the battery capacity of the energy storage battery is greater than or equal to the second preset capacity, the energy storage battery has sufficient power, and the PCS unit controls the energy storage battery to supply power to the load. Among them, the STS unit can automatically control the ATS unit to select the power distribution unit or the mains unit to supply power, and can also control the PCS unit to automatically charge and discharge the energy storage battery.

[0032] Embodiment 2

[0033] As Figures 1 - 3 shown, in another embodiment, the AC electrical coupling cabinet 100 includes a cabinet body 10 and a power supply module and an energy storage module arranged in the cabinet body 10. The power supply module includes a power distribution unit and a mains unit. The energy storage module includes an energy storage battery and a PCS unit for realizing the charging and discharging of the energy storage battery. It further includes a switch module for switching the power supply module or the energy storage battery to supply power to the load. The switch module includes an ATS unit for automatically switching the switch and an STS unit for controlling the PCS unit and the ATS unit. The energy storage battery is electrically connected to the automatic switch through the STS unit, and the ATS unit is electrically connected to the mains unit or the power distribution unit respectively; when the peak value change of the mains unit reaches a certain range and seriously exceeds or is lower than the first preset capacity (a fault occurs), the STS unit controls the power distribution unit or the energy storage battery to supply power to the load; when the power of the energy storage battery is less than the second preset capacity, the STS controls the mains unit or the power distribution unit to charge the energy storage battery.

[0034] In the above embodiment, the mains unit includes a wiring terminal for electrically connecting to the power grid or the mains, the power distribution unit includes a wiring terminal for electrically connecting to the generator, and the STS unit can also control the energy storage battery to charge during the low power consumption period of the mains unit (power grid); during the high power consumption period of the power grid, the energy storage battery is used to discharge and supply power to the load, which can reduce the load of the power grid and save electricity costs. Preferably, the power distribution unit is a high-power three-phase power supply, the energy storage battery is a large-capacity battery, and the PCS unit can realize the three-phase current output of the energy storage battery. Of course, the energy storage battery and the power distribution unit can also feed back electrical energy to the power grid (mains unit).

[0035] Embodiment 3

[0036] In a preferred embodiment, as Figure 4As shown, when the capacity change value of the mains unit is greater than a, the STS controls the ATS to select the power distribution unit or the PCS selects the energy storage battery to supply power to the load; when the capacity change value of the mains unit is less than or equal to a, the STS controls the ATS to select the mains unit or the PCS unit selects the energy storage battery to supply power to the load; wherein, the capacity change value = |instantaneous capacity - first preset capacity| / first preset capacity. When the energy storage battery capacity ratio is greater than or equal to b, the PCS unit controls the energy storage battery to discharge to supply power to the load; when the energy storage battery capacity ratio is less than b, the STS controls the mains unit or the power distribution unit to charge the energy storage battery; wherein, the capacity ratio = existing battery capacity / second preset capacity.

[0037] In the above embodiment, if a = 10%, the instantaneous capacity is 50 kW, and the first preset capacity is 40 kW, then the capacity change value = |50 - 40| / 40 = 25% > a, indicating that the power grid has a fault or is in a peak electricity consumption period; at this time, the STS controls the ATS to select the power distribution unit or the PCS selects the energy storage battery to supply power to the load; if b = 30%, the existing battery capacity of the energy storage battery is 40 kWh, and the second preset capacity is 50 kWh, then the capacity ratio = 40 / 50 = 80% > b, indicating that the energy storage battery has sufficient power; at this time, the PCS unit selects the energy storage battery to discharge to supply power to the load.

[0038] When the middle energy can select the mains unit, the power distribution unit or the energy storage battery to supply power to the load through the STS unit, the purpose of supplying power to the load stably and automatically for a long time can be achieved. It can be understood that both a and b can be manually set to achieve various power supply modes desired by the user. For example, the grid-connected working mode of using the mains unit for power supply, the off-grid working mode of only using the energy storage battery for power supply, and so on.

[0039] Embodiment Four

[0040] In a preferred embodiment, as Figures 1 - 5 shown, the cabinet 10 includes a control board 11, an indicator light 12, a switch 13, a mains electricity meter 17, a power distribution electricity meter 18, and a load electricity meter 19. The switch 13, the indicator light 12, and the STS unit are respectively electrically connected to the control board 11. The STS unit includes a bidirectional thyristor and an inductor CT for sensing voltage or electricity. The bidirectional thyristor is respectively electrically connected to the inductor CT and the ATS unit. The inductor CT is respectively electrically connected to the power supply module and the energy storage module. The mains electricity meter 17, the power distribution electricity meter 18, and the load electricity meter 19 are respectively electrically connected to the mains unit, the power distribution unit, and the load through the inductor CT.

[0041] In the above embodiment, the STS unit can be controlled by the control board 11. The indicator light 12 can display the operating status of each device. The switch 13 can start and stop the AC electrical coupling cabinet 100. The mains electricity meter 17 can display the amount of mains electricity used. The distribution electricity meter 18 can display the amount of distributed power used, and the load electricity meter 19 can display the amount of electricity consumed by the load. The bidirectional thyristor can automatically select the power supply module or the energy storage module for power supply. The inductor CT can sense the electricity consumption and instantaneous power of the mains electricity meter 17, the distribution electricity meter 18, and the load electricity meter 19. To make the STS unit more intelligent, the STS unit may further include a main control chip for analyzing and controlling the bidirectional thyristor and the inductor CT. The main control chip can analyze the data sensed by the inductor CT and automatically control the bidirectional thyristor to select the power supply module or the energy storage module for power supply.

[0042] Embodiment Five

[0043] In a preferred embodiment, Figure 4 As shown, the ATS unit includes a bidirectional selection switch with two input terminals. One input terminal of the bidirectional selection switch is electrically connected to the mains unit, and the other input terminal of the bidirectional selection switch is electrically connected to the distribution unit. The output terminal of the bidirectional selection switch is electrically connected to the STS unit. Preferably, the AC electrical coupling cabinet further includes a circuit breaker QF1, a circuit breaker QF2, an electric circuit breaker QF3, a circuit breaker QF4, and a signal interface 16. One input terminal of the bidirectional selection switch is electrically connected to the mains unit through the QF1, the other input terminal of the bidirectional selection switch is electrically connected to the distribution unit through the circuit breaker QF2, and the output terminal of the bidirectional selection switch is electrically connected to the STS unit through the electric circuit breaker QF3.

[0044] In the above embodiment, the bidirectional selection switch can automatically select the mains unit or the distribution unit to supply power to the load. The circuit breakers QF1, QF2, QF3, and circuit breaker QF4 are switches that can withstand large currents and voltages and have a long service life. Among them, the circuit breaker QF3 is a circuit breaker that can support remote control and can remotely control the load to be connected to or disconnected from the power grid. The circuit breaker QF4 is a protection switch for controlling the start and stop of the load. The STS unit and the control board 11 can communicate with the outside through the signal interface 16.

[0045] Embodiment Six

[0046] In a preferred embodiment, as Figures 4 - 6As shown, the PCS unit includes a soft start circuit, an inverter unit, an AC filter unit and a grid-connected relay which are electrically connected in sequence, the soft start circuit is electrically connected to the energy storage battery, and the grid-connected relay is electrically connected to the STS unit. Preferably, the power distribution unit is a diesel generator unit, the energy storage battery includes a battery BAT1 and a battery BAT1, the PCS unit includes PCS1 and PCS2, the battery BAT1 is electrically connected to the STS unit through the PCS1, and the battery BAT2 is electrically connected to the STS unit through the PCS2.

[0047] In the above embodiment, the soft start circuit can prevent the starting current from being too large, the inverter unit can realize the conversion between AC and DC, the AC filter unit is used to filter the harmonic current, the grid-connected relay is conducive to the electrical connection to the grid, and the PCS unit also includes an AC lightning protection device PE, which is electrically connected to the grid-connected relay. Figure 1 As shown, the diesel power generation unit includes a diesel generator. The price of diesel is not too high, which is conducive to reducing costs. The diesel generator is arranged outside the cabinet 10 and is electrically connected to the ATS through the wire hole 15. The cabinet 10 also includes a cabinet door 14, a load switch 21 and a transformer 22. The cabinet door 14 is conducive to maintaining the components in the cabinet 10, the load switch 21 is conducive to starting and stopping the load power supply, and the transformer 22 can adjust the output voltage to facilitate power supply to the load. Among them, the energy storage batteries BAT1 and BAT2 can also be electrically connected to the PCS1 and the PCS2 through circuit breakers QF4 and QF5 respectively.

[0048] In summary, the AC electrical coupling cabinet 100 disclosed in the present application realizes that the mains unit and the distribution unit quickly and automatically selectively (flexibly) supply power to the load through the STS unit, and automatically charges or discharges the energy storage battery to the load through the PCS unit, thereby automatically providing the load with appropriate power for a long time, which greatly facilitates the uninterrupted operation of the load.

[0049] The basic principles, main features and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and the description in the specification are only to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An AC electrical coupling cabinet, comprising a cabinet body and a switch module and an energy storage module arranged in the cabinet body, wherein: The switch module includes an ATS unit and an STS unit. The input side of the ATS unit is used to connect to the power supply module. The energy storage module includes at least two PCS units and energy storage batteries connected to each PCS unit. The power supply side of the STS unit is connected to the output side of the ATS unit. Two PCS units are connected in parallel to the power consumption side of the STS unit through an AC bus. Among them, the power supply module includes a mains unit and a power distribution unit; When the ATS unit detects that the power supply capacity of the mains unit is less than the first preset capacity, the STS unit switches to the off-grid state, and the PCS unit controls the energy storage battery to supply power to the load connected to the AC bus; When the STS unit detects that the battery capacity of the energy storage battery is less than the second preset capacity, the ATS unit controls the power distribution unit to start; when the electrical parameters detected by the ATS unit for the power distribution unit are consistent with the electrical parameters output by the PCS unit detected by the STS unit, the ATS unit controls the power distribution unit, and the PCS unit controls the energy storage battery to supply power to the load. Among them, the electrical parameters include voltage and phase.

2. The AC electrical coupling cabinet according to claim 1, characterized in that: When the ATS unit detects that the power supply capacity of the mains unit is greater than or equal to the first preset capacity, the STS unit switches to the grid-connected state, and the ATS unit controls the mains unit to supply power to the load; When the STS unit detects that the battery capacity of the energy storage battery is greater than or equal to the second preset capacity, the PCS unit controls the energy storage battery to supply power to the load.

3. The AC electrical coupling cabinet according to claim 1, characterized in that: When the capacity change value of the mains unit is greater than a, the STS controls the ATS to select the power distribution unit or the PCS to select the energy storage battery to supply power to the load; When the capacity change value of the mains unit is less than or equal to a, the STS controls the ATS to select the mains unit or the PCS unit to select the energy storage battery to supply power to the load; the capacity change value = |instantaneous capacity - first preset capacity| / first preset capacity.

4. The AC electrical coupling cabinet according to claim 3, wherein: When the energy storage battery capacity ratio is greater than or equal to b, the PCS unit controls the energy storage battery to discharge and supply power to the load; When the energy storage battery capacity ratio is less than b, the STS controls the mains unit or the power distribution unit to charge the energy storage battery; the capacity ratio = existing battery capacity / second preset capacity.

5. The AC electrical coupling cabinet according to claim 1, characterized in that: The STS unit includes a bidirectional thyristor and an inductor CT for sensing voltage or electricity. The bidirectional thyristor is electrically connected to the inductor CT and the ATS respectively. The inductor CT is electrically connected to the power supply module and the energy storage module respectively.

6. The AC electrical coupling cabinet according to claim 5, characterized in that: The cabinet body includes a control board, a switch and an indicator light. The switch, the indicator light and the STS unit are electrically connected to the control board respectively.

7. The AC electrical coupling cabinet according to claim 6, wherein: The cabinet body further includes a mains electricity meter, a power distribution electricity meter and a load electricity meter. The mains electricity meter, the power distribution electricity meter and the load electricity meter are all electrically connected to the mains unit, the power distribution unit and the load respectively through the inductor CT.

8. The AC electrical coupling cabinet according to claim 1, wherein: The ATS unit includes a bidirectional selection switch with two input terminals. One input terminal of the bidirectional selection switch is electrically connected to the mains unit, the other input terminal of the bidirectional selection switch is electrically connected to the power distribution unit, and the output terminal of the bidirectional selection switch is electrically connected to the STS unit.

9. The AC electrical coupling cabinet according to claim 8, wherein: The AC electrical coupling cabinet further includes a circuit breaker QF1, a circuit breaker QF2, and an electric circuit breaker QF3. One input terminal of the bidirectional selection switch is electrically connected to the mains unit through the QF1, the other input terminal of the bidirectional selection switch is electrically connected to the power distribution unit through the circuit breaker QF2, and the output terminal of the bidirectional selection switch is electrically connected to the STS unit through the electric circuit breaker QF3.

10. The AC electrical coupling cabinet according to claim 1, characterized in that: The PCS unit includes a soft start circuit, an inverter unit, an AC filter unit, and a grid connection relay that are electrically connected in sequence. The soft start circuit is electrically connected to the energy storage battery, and the grid connection relay is electrically connected to the STS unit.

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