CN213817249U

CN213817249U - Output device of household energy storage system

Info

Publication number: CN213817249U
Application number: CN202022826863.8U
Authority: CN
Inventors: 王斌; 倪桂林; 何智良; 吴生闻
Original assignee: Aishiwei New Energy Technology Yangzhong Co ltd
Current assignee: Aishiwei New Energy Technology Yangzhong Co ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-07-27
Anticipated expiration: 2030-11-30

Abstract

The utility model discloses an output device of energy storage system is used at family, it has the input positive pole and the input negative pole that are used for being connected with the dc-to-ac converter, is used for anodal and the first output negative pole of the first output of being connected with the electric wire netting, and is used for anodal and the second output negative pole of the second output of being connected with the load. The output device comprises a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch and a seventh switch; the first switch and the second switch are connected in series between the positive pole of the input end and the positive pole of the first output end; the third switch and the fourth switch are connected in series between the negative electrode of the input end and the negative electrode of the first output end; the fifth switch is connected between the positive electrode of the input end and the positive electrode of the second output end; the sixth switch and the seventh switch are connected in series between the negative electrode of the input end and the negative electrode of the second output end. The utility model discloses an output device uses less switching element, can realize UPS (uninterrupted power supply) function simply reliably.

Description

Output device of household energy storage system

Technical Field

The utility model relates to an output device of energy storage system is used at family.

Background

Due to the increasingly serious environmental problems, there is an increasing demand for clean energy. Meanwhile, the power grid is networked and intelligentized, and household energy storage is more and more widely used. The output structure of single-phase energy storage for users such as photovoltaic power generation systems is of great importance to the whole system. The photovoltaic grid-connected inverter is used for converting direct current generated by the solar panel into alternating current to be directly transmitted to a power grid or supplied to a load, namely, the output end of the inverter is electrically connected with the power grid and the load directly or through a transformer and the like. In order to meet the safety requirement, the safety requirement is that a plurality of groups of relays are required to be connected in series at the output end of the inverter and the input end of the power grid, a plurality of groups of relays are required to be connected in series at the output side of the inverter and the input end of the load, and the like, so that the inverter can be timely and reliably disconnected from the power grid when the system is abnormal. The traditional relay switching logic of the household energy storage output structure is too complex, the number of relays is too large, and the function of fast grid-connected and off-grid switching (UPS) is difficult to realize.

SUMMERY OF THE UTILITY MODEL

In order to solve the above technical problem, an object of the present invention is to provide an output device for a household energy storage system, which uses fewer switching devices and can simply and reliably realize a UPS (uninterruptible power supply) function.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

an output device of a household energy storage system is provided with an input end anode and an input end cathode which are used for being connected with an inverter, a first output end anode and a first output end cathode which are used for being connected with a power grid, and a second output end anode and a second output end cathode which are used for being connected with a load, wherein the output device comprises a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch and a seventh switch; the first switch and the second switch are connected in series between the positive pole of the input end and the positive pole of the first output end; the third switch and the fourth switch are connected in series between the input end cathode and the first output end cathode; the fifth switch is connected between the positive electrode of the input end and the positive electrode of the second output end; the sixth switch and the seventh switch are connected in series between the negative electrode of the input end and the negative electrode of the second output end.

Preferably, the output device has a grid-connected operating state, and the first switch to the seventh switch are all closed in the grid-connected operating state.

Preferably, the output device has an off-grid operating state, and in the off-grid operating state, the first switch, the second switch, the third switch, and the fourth switch are turned off, and the fifth switch, the sixth switch, and the seventh switch are turned on.

Preferably, the output device has a bypass operating state in which the first to seventh switches are all closed.

Preferably, a connection point of the sixth switch and the seventh switch is grounded.

Preferably, the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch and the seventh switch are relays, respectively.

Preferably, the output device further includes a controller for controlling on and off of the switches, and the controller is electrically connected to the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, and the seventh switch, respectively.

The utility model adopts the above scheme, compare prior art and have following advantage:

the utility model discloses an output device can realize being incorporated into the power networks and switching off from the net with the switching device of less quantity, and switching device quantity is less, and switching control logic is simple moreover, can simply reliable switch and realize the UPS function.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced 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 diagram of an output device according to an embodiment of the present invention.

Wherein:

1. an inverter; 2. an output device; 21. the input end is positive; 22. a negative electrode of the input end; 23. a first output terminal anode; 24. a first output terminal cathode; 25. a second output terminal anode; 26. a second output terminal cathode; 3. a power grid; 4. and (4) a power grid.

Detailed Description

The following detailed description of the preferred embodiments of the invention, taken in conjunction with the accompanying drawings, enables the advantages and features of the invention to be more readily understood by those skilled in the art. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the term "connected" is to be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The embodiment provides an output device of a household energy storage system, in particular to an output device of a household photovoltaic energy storage system. Referring to fig. 1, in the household energy storage system, an output device 2 is connected among an inverter 1, a grid 3 and a load 4, and electric energy generated by a photovoltaic panel is converted into alternating current by the inverter 1 and then is supplied to the grid 3 or the load 4 through the output device 2. The output device 2 has an input positive pole 21 and an input negative pole 22 for connection to the inverter 1, a first output positive pole 23 and a first output negative pole 24 for connection to the network 3, and a second output positive pole 25 and a second output negative pole 26 for connection to the load 4.

The output device 2 specifically includes a first switch Relay1, a second switch Relay2, a third switch Relay3, a fourth switch Relay4, a fifth switch Relay5, a sixth switch Relay6, and a seventh switch Relay 7. Specifically, the first switch Relay1, the second switch Relay2, the third switch Relay3, the fourth switch Relay4, the fifth switch Relay5, the sixth switch Relay6, and the seventh switch Relay7 are relays, respectively. The first switch Relay1 and the second switch Relay2 are connected in series between the positive electrode 21 of the input end and the positive electrode 23 of the first output end; the third switch Relay3 and the fourth switch Relay4 are connected in series between the input end cathode 22 and the first output end cathode 24; the first to fourth switches Relay1 to Relay4 may enable connection or isolation of the inverter 1 and the grid 3. The fifth switch Relay5 is connected between the input end positive electrode 21 and the second output end positive electrode 25; the sixth switch Relay6 and the seventh switch Relay7 are connected in series between the input terminal cathode 22 and the second output terminal cathode 26. The fifth to seventh switches Relay5 to Relay7 may enable connection or isolation of the inverter 1 and the load 4.

Further, the connection point of the sixth switch Relay6 and the seventh switch Relay7 is grounded, which satisfies the consideration of facing towards the Ground.

The output device 2 further comprises a controller for controlling the on and off of the switches, and the controller is electrically connected with the first switch Relay1, the second switch Relay2, the third switch Relay3, the fourth switch Relay4, the fifth switch Relay5, the sixth switch Relay6 and the seventh switch Relay7 respectively.

The output device 2 has a grid-connected operating state in which the first switch Relay1 to the seventh switch Relay7 are all closed. The output device 2 further has an off-grid operation state in which the first switch Relay1, the second switch Relay2, the third switch Relay3, and the fourth switch Relay4 are open, and the fifth switch Relay5, the sixth switch Relay6, and the seventh switch Relay7 are closed. The output device 2 also has a bypass operation state in which the first through seventh switches Relay1 through Relay7 are all closed.

The household energy storage machine is connected with an alternating current side power grid 3 and a load 4 through an inverter 1, and alternating current energy is supplied to the power grid 3 and the load 4 through the inverter 1. For this household, the energy storage machine usually has three stable power supply states:

(1) and (3) grid connection working state:

when grid-connected work is carried out, Relay 1-7 are all closed, the inverter 1 is in grid-connected work and works in a rectification mode, and the energy of the load 4 is provided by the inverter 1 or the power grid 3.

(2) The off-grid working state:

when the power grid 3 is abnormal and works off the grid, Relay 1-4 are disconnected, Relay 5-7 are closed, and the inverter 1 performs inversion output to completely supply power to the load 4.

(3) Bypass operating condition

The inverter 1 is abnormal or standby, the power grid 3 is normal, Relay 1-7 are closed, and the power grid 3 supplies power to the load 4.

For the dynamic switching, two switching conditions exist, namely grid connection switching and grid disconnection or grid disconnection and grid connection work, and the analysis shows that only Relay 1-4 needs to be disconnected and closed during the off-grid switching, so that the UPS function can be rapidly realized.

The above embodiments are only for illustrating the technical concept and features of the present invention, and are preferred embodiments, which are intended to enable persons skilled in the art to understand the contents of the present invention and to implement the present invention, and thus, the protection scope of the present invention cannot be limited thereby. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. An output device of a household energy storage system, which is provided with an input end anode and an input end cathode which are connected with an inverter, a first output end anode and a first output end cathode which are connected with a power grid, and a second output end anode and a second output end cathode which are connected with a load, and is characterized in that: the output device comprises a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch and a seventh switch; the first switch and the second switch are connected in series between the positive pole of the input end and the positive pole of the first output end; the third switch and the fourth switch are connected in series between the input end cathode and the first output end cathode; the fifth switch is connected between the positive electrode of the input end and the positive electrode of the second output end; the sixth switch and the seventh switch are connected in series between the negative electrode of the input end and the negative electrode of the second output end.

2. The output device of claim 1, wherein: the output device has a grid-connected working state, and the first switch to the seventh switch are all closed in the grid-connected working state.

3. The output device of claim 1, wherein: the output device has an off-grid working state, and in the off-grid working state, the first switch, the second switch, the third switch and the fourth switch are turned off, and the fifth switch, the sixth switch and the seventh switch are turned on.

4. The output device of claim 1, wherein: the output device has a bypass operating state in which the first to seventh switches are all closed.

5. The output device of claim 1, wherein: the connection point of the sixth switch and the seventh switch is grounded.

6. The output device of claim 1, wherein: the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, and the seventh switch are relays, respectively.

7. The output device according to claim 1 or 6, characterized in that: the output device further comprises a controller for controlling on and off of the switches, and the controller is electrically connected with the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch and the seventh switch respectively.