Energy storage and inversion all-in-one machine

Abstract

The utility model relates to the field of new energy power generation and transmission, in particular to an energy storage and inversion all-in-one machine, which comprises an inversion control unit for bidirectional current conversion; the energy storage battery unit is electrically connected to the inversion control unit, the energy storage battery unit receives the input of the inversion control unit to store electricity, or the energy storage battery unit outputs electric energy to the inversion control unit; the photovoltaic input unit is electrically connected to the inversion control unit and outputs electric energy generated by photovoltaic power generation to the inversion control unit; the inversion control unit is electrically connected with a GRID interface, the public power grid is electrically connected with the GRID interface, and the inversion control unit transmits electric energy to the public power grid through the GRID interface. The application has the effects of expanding the adaptation range and enhancing the independence of the system.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of new energy power generation transmission, in particular to a storage energy inverter integrated machine. BACKGROUND

[0002] At present, solar energy as a new type of renewable green energy, because of its clean, pollution-free, rich storage and other advantages, is favored.

[0003] The simple off-grid type storage energy inverter system can usually only charge the battery and power the load through photovoltaic power generation, and the application range is small, for example, it is difficult to apply in areas with low photoelectric conversion rate. The simple grid-connected storage energy inverter system has poor independence, and when the public power grid fails or is powered off, the system cannot be used. CONTENT OF THE INVENTION

[0004] In order to improve the problems of small application range of off-grid type storage energy inverter system and poor independence of grid-connected storage energy inverter system, the present application provides a storage energy inverter integrated machine.

[0005] The storage energy inverter integrated machine provided by the present application adopts the following technical scheme:

[0006] A storage energy inverter integrated machine comprises:

[0007] An inverter control unit is used for bidirectional current conversion;

[0008] A storage battery unit is electrically connected to the inverter control unit, and the storage battery unit receives the input of the inverter control unit for power storage, or the storage battery unit outputs power to the inverter control unit;

[0009] A photovoltaic input unit is electrically connected to the inverter control unit, and outputs the power generated by photovoltaic power generation to the inverter control unit;

[0010] A public power grid is electrically connected to a GRID interface of the inverter control unit, and the public power grid is electrically connected to the GRID interface, and the inverter control unit transmits power with the public power grid through the GRID interface.

[0011] By adopting the above technical scheme, the power generated by the solar panel is combined with the inverter control unit through the photovoltaic input unit and the public power grid, and the power generation is offset to reduce the power cost of the user. At the same time, when the public power grid fails or is powered off, the inverter control unit can switch to off-grid mode to continue to provide power for the user, and can adapt to different application scenarios.

[0012] Optionally, it comprises:

[0013] A direct current breaker QF1 is electrically connected between the energy storage battery unit and the inverter control unit.

[0014] By adopting the technical scheme, the energy storage battery unit is controlled and protected.

[0015] Optionally, the system comprises:

[0016] A direct current disconnector QS1 is electrically connected between the photovoltaic input unit and the inverter control unit.

[0017] By adopting the technical scheme, the photovoltaic input unit is controlled and protected.

[0018] Optionally, the system comprises:

[0019] A diesel generator input unit is connected in parallel between the inverter control unit and the public power grid, and is used to input electric energy to the inverter control unit.

[0020] By adopting the technical scheme, the alternating current generated by the diesel generator can be rectified into direct current by the inverter control unit to charge the energy storage battery unit while supplying the household load through the diesel generator input unit.

[0021] Optionally, the system comprises:

[0022] An automatic transfer switch ATSE is electrically connected between the inverter control unit and the public power grid, and the diesel generator input unit is electrically connected to the automatic transfer switch ATSE, and the automatic transfer switch ATSE is used to switch circuits.

[0023] By adopting the technical scheme, switching to different circuits in different situations is realized, the circuit adaptability is improved, and the range of situations that the system can adapt to is expanded.

[0024] Optionally, the system comprises:

[0025] An emergency power supply device is electrically connected to the EPS interface of the inverter control unit, and the emergency power supply device is electrically connected to the EPS interface, and the emergency power supply device is used to supply power to the inverter control unit.

[0026] By adopting the technical scheme, the household load is supplied with power when the public power grid does not supply power and the energy storage battery unit is insufficient, and the energy storage battery unit is charged at the same time, thereby improving the stability of the system.

[0027] Optionally, the system comprises:

[0028] An electric leakage protection module is electrically connected between the emergency power supply device and the inverter control unit, and is used to detect and protect the emergency power supply device from electric leakage.

[0029] By adopting the technical scheme, the electric leakage protection is performed, the protection is played, and the overall safety of the system is improved.

[0030] Optionally, comprising:

[0031] An E-BAR interface, the inverter control unit, the EPS interface, the GRID interface, the public power grid and the standby power supply device are simultaneously electrically connected on the E-BAR interface, and the E-BAR interface is used for connecting a ground wire.

[0032] By adopting the technical scheme, the grounding protection of the system is realized, and the probability of the device being live and endangering the user is reduced.

[0033] Optionally, comprising:

[0034] A Smart meter interface, which is electrically connected between the inverter control unit and the public power grid, and is used for externally connecting a smart meter to detect the power transmission of the public power grid.

[0035] By adopting the technical scheme, the Smart meter interface is electrically connected with the anti-backflow meter, the anti-backflow meter is a smart meter specially designed to prevent power backflow, and is mainly used in photovoltaic systems and other renewable energy power generation systems. When the power generated by the renewable energy power generation system exceeds the local load demand, excess power backflow into the public power grid occurs. Backflow can cause power quality problems of the power grid, affect the stability of the power grid, and cause safety accidents. Once the anti-backflow meter detects that the current flows to the power grid, data is sent to the inverter control unit. After the inverter control unit receives the data, the output power of the inverter control unit is quickly adjusted to maintain power balance, so as to realize zero power on the grid and prevent backflow.

[0036] In summary, the present application has at least one of the following beneficial technical effects:

[0037] 1. The power generated by the solar cell panel is integrated into the public power grid through the photovoltaic input unit and the inverter control unit, and the power generation is offset to reduce the power cost of the user

[0038] 2. When the public power grid fails or is powered off, the inverter control unit can switch to an off-grid mode to continue to provide power for the user, and can adapt to different application scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is a circuit schematic diagram of an energy storage inverter integrated machine in an embodiment of the present application.

[0040] Explanation of reference signs: 1, inverter control unit; 11, energy storage battery unit; 12, photovoltaic input unit; 13, public power grid; 2, diesel generator input unit; 21, automatic transfer switch ATSE; 3, backup power supply device; 31, leakage protection module. DETAILED DESCRIPTION

[0041] The following will be described in detail in combination with the accompanying drawings. Figure 1 The present application is further described in detail.

[0042] The embodiment of the present application discloses an energy storage inverter integrated machine. Referring to Figure 1 , the energy storage inverter integrated machine comprises an inverter control unit 1, an energy storage battery unit 11, a photovoltaic input unit 12, a public power grid 13, a direct current circuit breaker QF1, a direct current isolation switch QS1, a diesel generator input unit 2, an automatic transfer switch ATSE 21, a household electric meter PJ1, a backup power supply device 3, a leakage protection module 31, an E-BAR interface and a Smart meter interface, the inverter control unit 1 comprises an inverter with a bidirectional current conversion module, the energy storage battery unit 11 adopts an energy storage battery, the photovoltaic input unit 12 can adopt a photovoltaic string, the energy storage battery unit 11 and the photovoltaic input unit 12 are electrically connected to the inverter control unit 1, the inverter control unit 1 is electrically connected with a GRID interface, the public power grid 13 is electrically connected to the GRID interface, and the inverter control unit 1 can invert the front-stage voltage provided by the energy storage battery unit 11 into alternating current and then connect to the public power grid 13 or operate in off-grid mode. The inverter control unit 1 can also rectify the front-stage direct current provided by the photovoltaic input unit 12 into direct current suitable for charging the energy storage battery unit 11 or rectify the alternating current provided by the public power grid 13 into direct current suitable for charging the energy storage battery unit 11.

[0043] Referring to Figure 1 , the positive electrode and the negative electrode of the energy storage battery unit 11 are connected to the inverter control unit 1 through the direct current circuit breaker QF1, the direct current generated by the photovoltaic input unit 12 is connected to the inverter control unit 1 through the direct current isolation switch QS1, and the inverter control unit 1 is integrated with an MPPT controller, which performs MPPT tracking on the photovoltaic input unit 12, so that the photovoltaic input unit 12 operates at the maximum power point, and ensures that the photovoltaic panel can output more power. The inverter control unit 1 and the energy storage battery unit 11 are connected through RS485 or CAN to monitor the power storage condition of the energy storage battery unit 11, so as to control the charging of the energy storage battery unit 11 or control the discharging of the energy storage battery unit 11.

[0044] Referring to Figure 1, the automatic transfer switch ATSE 21 and the household electricity meter PJ1 are connected in series between the GRID interface of the inverter control unit 1 and the access port of the public power grid 13, the firewire end and the zero line end of the GRID interface of the inverter control unit 1 are connected to the automatic transfer switch ATSE 21, then connected to the household electricity meter PJ1 through the automatic transfer switch ATSE 21, and finally connected to the access port of the public power grid 13 through the household electricity meter PJ1.

[0045] With reference to Figure 1 , the diesel generator input unit 2 is connected in parallel to the automatic transfer switch ATSE 21, and the circuit is switched through the automatic transfer switch ATSE 21, the automatic transfer switch ATSE 21 can switch the circuit to be electrically connected to the public power grid 13 and the inverter control unit 1, and the automatic transfer switch ATSE 21 can also switch the circuit to be electrically connected to the diesel generator input unit 2 and the inverter control unit 1. The diesel generator input unit 2 in the figure is GEN, which can be regarded as a GEN port, and the diesel generator input unit 2 is plugged into the GEN port. GEN can also be directly regarded as a diesel generator input unit 2, and the diesel generator input unit 2 can also not be a diesel generator, but can be regarded as other power grid input.

[0046] With reference to Figure 1 , the household electricity meter PJ1 is a smart electricity meter for home use, which is used to monitor the input or output of the public power grid 13, and to communicate and transmit data externally, for example, to transmit data with the user's terminal device or the cloud of the power bureau, to realize monitoring of electric energy.

[0047] With reference to Figure 1 , the inverter control unit 1 is electrically connected to the EPS interface, the residual current protection module 31 is connected in series to the EPS interface, and the standby power supply device 3 is connected in series to the residual current protection module 31. The residual current protection module 31 in the figure is RCD, which can be regarded as an RCD port. The residual current protection module 31 is plugged into the RCD port, so that the residual current protection module 31 is connected between the EPS interface and the standby power supply device 3. RCD can also be regarded as a residual current protection module 31, and the residual current protection module 31 adopts a device for detecting residual current. The standby power supply device 3 is EPS, which can be regarded as an EPS port. The standby power supply device 3 is plugged into the EPS port. EPS can also be directly regarded as a standby power supply device 3. The standby power supply device 3 can adopt a diesel engine or an energy storage battery pack to supply power to the inverter control unit 1 in the case of no input of the public power grid 13.

[0048] With reference to Figure 1 , the inverter control unit 1, the EPS interface, the GRID interface, the public power grid 13 and the standby power supply device 3 are simultaneously electrically connected to the E-BAR interface, and the E-BAR interface is used to connect the ground wire.

[0049] With reference toFigure 1 One end of the smart meter interface is electrically connected to the inverter control unit 1, and the other end of the smart meter interface is connected in parallel between the automatic transfer switch ATSE21 and the household electric meter PJ1, and the smart meter interface is used to externally connect the smart electric meter.

[0050] The implementation principle of the energy storage inverter integrated machine in the embodiment of the application is that when there is no public power grid 13 for power supply, the inverter control unit 1 can invert the front-stage voltage provided by the energy storage battery unit 11 into alternating current connected to the public power grid 13 or alternating current for off-grid operation.

[0051] When receiving photovoltaic power generation or power supply of the public power grid 13, the inverter control unit 1 can also rectify the front-stage direct current provided by the photovoltaic input unit 12 into direct current suitable for charging the energy storage battery unit 11 or rectify the alternating current provided by the public power grid 13 into direct current suitable for charging the energy storage battery unit 11.

[0052] The above are preferred embodiments of the application, and do not limit the protection scope of the application, so that: any equivalent changes made according to the structure, shape, principle of the application should be covered within the protection scope of the application.

Claims

1. An energy storage inverter all-in-one machine, characterized in that, Comprising: an inverter control unit (1) for bidirectional current conversion; a storage battery unit (11) electrically connected to the inverter control unit (1), the storage battery unit (11) receiving input from the inverter control unit (1) for storage, or the storage battery unit (11) outputting power to the inverter control unit (1); a photovoltaic input unit (12) electrically connected to the inverter control unit (1), outputting power generated by photovoltaic power generation to the inverter control unit (1); a public power grid (13), the inverter control unit (1) being electrically connected to a GRID interface, the public power grid (13) being electrically connected to the GRID interface, the inverter control unit (1) transmitting power to the public power grid (13) through the GRID interface.

2. The energy storage inverter all-in-one machine according to claim 1, characterized in that, Comprising: a DC circuit breaker QF1 electrically connected between the storage battery unit (11) and the inverter control unit (1).

3. The energy storage inverter all-in-one machine of claim 1, wherein, Comprising: a DC disconnector QS1 electrically connected between the photovoltaic input unit (12) and the inverter control unit (1).

4. The energy storage inverter all-in-one machine of claim 1, wherein, Comprising: a diesel generator input unit (2) connected in parallel between the inverter control unit (1) and the public power grid (13), for inputting power to the inverter control unit (1).

5. The energy storage inverter all-in-one machine according to claim 4, characterized in that, Comprising: an automatic transfer switch ATSE (21) electrically connected between the inverter control unit (1) and the public power grid (13), and the diesel generator input unit (2) being electrically connected to the automatic transfer switch ATSE (21), the automatic transfer switch ATSE (21) being used for switching circuits.

6. The energy storage inverter all-in-one machine of claim 1, wherein, Comprising: a backup power supply device (3), the inverter control unit (1) being electrically connected to an EPS interface, the backup power supply device (3) being electrically connected to the EPS interface, the backup power supply device (3) being used for supplying power to the inverter control unit (1).

7. The energy storage inverter all-in-one machine according to claim 6, characterized in that, Comprising: a leakage protection module (31) electrically connected between the backup power supply device (3) and the inverter control unit (1), for leakage detection and leakage protection of the backup power supply device (3).

8. The energy storage inverter all-in-one machine according to claim 7, characterized in that, Comprising: an E-BAR interface, the inverter control unit (1), the EPS interface, the GRID interface, the public power grid (13) and the backup power supply device (3) being electrically connected to the E-BAR interface at the same time, the E-BAR interface being used for connecting ground wire.

9. The energy storage inverter all-in-one machine of claim 1, wherein, Comprising: a Smart meter interface electrically connected between the inverter control unit (1) and the public power grid (13), the Smart meter interface being used for externally connecting a smart meter to detect power transmission of the public power grid (13).

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