Power supply switching circuit for energy storage electricity

Abstract

The utility model belongs to the technical field of energy storage and power utilization, and particularly discloses a power supply switching circuit for energy storage and power utilization. Comprising a commercial power grid inlet wire, a commercial power grid switch cabinet, a first transformer, a second transformer, a first power distribution cabinet, a second power distribution cabinet, switches QF1, QF2, QF3, QF4 and QF5, a first isolator, a first energy storage inverter, a first energy storage battery, a second isolator, a second energy storage inverter, a second energy storage battery and a connection relation thereof. According to the utility model, through the switch group in the power supply switching cabinet, power utilization switching can be carried out under different power utilization conditions, the electric energy utilization rate of the energy storage battery pack is fully improved, and the power supply reliability is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage electricity, in particular to an energy storage electricity power supply switching circuit. Background Art

[0002] The energy storage power system charges the energy storage power station through the municipal grid during off-peak or normal electricity prices, and discharges the energy storage power station to supply power to the electricity load during peak electricity prices, thereby utilizing the difference between peak and off-peak electricity prices to bring economic benefits.

[0003] Currently, industrial and commercial energy storage systems are used to power office buildings, commercial buildings, and other locations, which often have multiple distribution cabinets. Traditional energy storage power stations typically operate on a one-to-one basis, with each battery pack supplying only one distribution cabinet. When multiple battery packs are used to power multiple distribution cabinets, the varying power requirements of each distribution cabinet, as well as the varying hours and frequencies of use of different loads, lead to varying rates of power consumption within each battery pack. This can lead to situations where one battery pack is depleted during peak electricity prices while others still have significant remaining power. In this scenario, the load carried by the depleted battery pack must be supplied by the still-high-priced utility power, while the lower-priced power stored in the other battery packs remains unused. This results in reduced energy utilization within the energy storage station, thereby reducing the economic benefits of the energy storage system. Utility Model Content

[0004] The purpose of the utility model is to solve the technical problems existing in the background technology, and to this end, provides an energy storage power supply switching circuit.

[0005] In order to achieve the above purpose, the technical solutions adopted by this utility model are as follows:

[0006] An energy storage power supply switching circuit includes a mains power supply component, a first power distribution cabinet, a second power distribution cabinet, a power supply switching cabinet, a first energy storage component and a second energy storage component;

[0007] The two output ends of the mains power supply component are electrically connected to the first distribution cabinet and the second distribution cabinet respectively;

[0008] The power switching cabinet includes a switch group, namely switches QF1, QF2, QF3, QF4, and QF5;

[0009] Switches QF1 and QF2 are electrically connected between the first power distribution cabinet and the first energy storage assembly, and the switches QF1 and QF2 are connected in series;

[0010] Switches QF3 and QF4 are electrically connected between the second power distribution cabinet and the second energy storage assembly, and the switches QF3 and QF4 are connected in series;

[0011] One end of the switch QF5 is connected to the line between the switches QF1 and QF2 , and the other end is connected to the line between the switches QF3 and QF4 .

[0012] The following is a technical solution further defined by the present invention. The mains power supply assembly includes a mains power supply line, a mains switch cabinet, a first transformer and a second transformer. The mains power supply line is electrically connected to the mains switch cabinet, the mains switch cabinet is electrically connected to the first transformer, and the mains switch cabinet is electrically connected to the second transformer.

[0013] The following is a technical solution further defined by the present invention, in which a switch is provided on the mains power line.

[0014] The following is a technical solution further defined by the present invention: a switch is connected between the mains switch cabinet and the input end of the first transformer, and a switch is connected between the mains switch cabinet and the input end of the second transformer.

[0015] The following is a technical solution further defined by the present invention: a switch is connected between the output end of the first transformer and the first distribution cabinet.

[0016] The following is a technical solution further defined by the present invention: a switch is connected between the output end of the second transformer and the second distribution cabinet.

[0017] The following is a technical solution further defined by the present invention: the first energy storage component includes a first isolator, a first energy storage inverter and a first energy storage battery, the first isolator is electrically connected to the first energy storage inverter, and the first energy storage inverter is electrically connected to the first energy storage battery.

[0018] The following is a technical solution further defined by the present invention: the first isolator is electrically connected to the switch QF2, and a switch is connected between the first isolator and the first energy storage inverter.

[0019] The following is a technical solution further defined by the present invention: the second energy storage component includes a second isolator, a second energy storage inverter and a second energy storage battery, the second isolator is electrically connected to the second energy storage inverter, and the second energy storage inverter is electrically connected to the second energy storage battery.

[0020] The following is a technical solution further defined by the present invention: the second isolator is electrically connected to the switch QF4, and a switch is connected between the second isolator and the second energy storage inverter.

[0021] Compared with the prior art, the present invention has the following technical effects:

[0022] The utility model can switch the power consumption under different power consumption conditions through the switch group in the power switching cabinet, fully improves the power utilization rate of the energy storage battery group, and ensures the power supply reliability.

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 It is a circuit connection diagram of the utility model.

[0026] Figure numerals: 1. first power distribution cabinet; 2. second power distribution cabinet; 3. power switching cabinet; 4. mains power line; 5. mains switch cabinet; 6. first transformer; 7. second transformer; 8. first isolator; 9. first energy storage inverter; 10. first energy storage battery; 11. second isolator; 12. second energy storage inverter; 13. second energy storage battery. DETAILED DESCRIPTION

[0027] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one of such features.

[0029] like Figure 1As shown, this embodiment provides an energy storage power supply switching circuit. It primarily comprises a 10kV mains incoming line 4, a 10kV mains switchgear 5, a 10kV / 400V first transformer 6, a 10kV / 400V second transformer 7, a 400V first distribution cabinet 1, a 400V second distribution cabinet 2, a power switching cabinet 3 (switches QF1, QF2, QF3, QF4, QF5), a first isolator 8, a first energy storage inverter 9, a first energy storage battery 10, a second isolator 11, a second energy storage inverter 12, and a second energy storage battery 13.

[0030] The utility grid incoming line 4 is electrically connected to the utility grid switch cabinet 5, which is equipped with a switch. A switch is connected between the utility grid switch cabinet 5 and the input of the first transformer 6, a switch is connected between the utility grid switch cabinet 5 and the input of the second transformer 7, a switch is connected between the output of the first transformer 6 and the first distribution cabinet 1, and a switch is connected between the output of the second transformer 7 and the second distribution cabinet 2. Switches QF1 and QF2 are electrically connected between the first distribution cabinet 1 and the first energy storage assembly, with switches QF1 and QF2 connected in series. Switches QF3 and QF4 are electrically connected between the second distribution cabinet 2 and the second energy storage assembly, with switches QF3 and QF4 connected in series. One end of switch QF5 is connected to the line between switches QF1 and QF2, and the other end is connected to the line between switches QF3 and QF4. The first isolator 8 is electrically connected to the switch QF2. A switch is connected between the first isolator 8 and the first energy storage inverter 9. The first energy storage inverter 9 is electrically connected to the first energy storage battery 10. The second isolator 11 is electrically connected to the switch QF4. A switch is connected between the second isolator 11 and the second energy storage inverter 12. The second energy storage inverter 12 is electrically connected to the second energy storage battery 13.

[0031] During off-peak electricity price periods, the battery pack is in a charging state. At this time, switch QF5 is open, and switches QF1, QF2, QF3, and QF4 are closed. The first energy storage battery 10 is charged by power from the first distribution cabinet 1, and the second energy storage battery 13 is charged by power from the second distribution cabinet 2. When the first energy storage battery 10 is fully charged, switches QF1 and QF2 are open, and when the second energy storage battery 13 is fully charged, switches QF3 and QF4 are open.

[0032] During peak electricity price periods, the battery pack operates in a discharging state. At this time, switch QF5 is open, and switches QF1, QF2, QF3, and QF4 are closed. The first energy storage battery 10 supplies power to the load carried by the first distribution cabinet 1 through switches QF2 and QF1, and the second energy storage battery 13 supplies power to the load carried by the second distribution cabinet 2 through switches QF4 and QF3.

[0033] When the battery pack is operating in a discharging state, if the second energy storage battery 13 is depleted and the first energy storage battery 10 has some power remaining, the second energy storage battery 13 shuts down, and the first energy storage battery 10 supplies power to both the first distribution cabinet 1 and the second distribution cabinet 2. At this point, switch QF4 opens, and switches QF1, QF2, QF3, and QF5 close.

[0034] When the battery pack is operating in a discharging state, when the first energy storage battery 10 is depleted and the second energy storage battery 13 has some power remaining, the first energy storage battery 10 shuts down, and the second energy storage battery 13 supplies power to both the first and second distribution cabinets 1 and 2. At this point, switch QF2 is open, and switches QF1, QF3, QF4, and QF5 are closed.

[0035] When all batteries are exhausted and it is still during the peak electricity price period, switches QF1, QF2, QF3, QF4, and QF5 are all opened, and the power load is supplied by the mains.

[0036] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any person skilled in the art can, without departing from the scope of the present invention, utilize the methods and technical content disclosed above to make many possible variations and modifications to the present invention, or modify it into equivalent embodiments with equivalent variations. Therefore, any equivalent variations based on the shape, structure, and principle of the present invention that do not depart from the content of the present invention are intended to be covered by the scope of protection of the present invention.

Claims

1. An energy storage power supply switching circuit, characterized in that: It comprises a city grid power supply component, a first power distribution cabinet (1), a second power distribution cabinet (2), a power switching cabinet (3), a first energy storage component and a second energy storage component; The two output ends of the mains power supply component are electrically connected to the first power distribution cabinet (1) and the second power distribution cabinet (2) respectively; The power switching cabinet (3) comprises a switch group, namely switches QF1, QF2, QF3, QF4, and QF5; Switches QF1 and QF2 are electrically connected between the first power distribution cabinet (1) and the first energy storage component, and the switches QF1 and QF2 are connected in series; Switches QF3 and QF4 are electrically connected between the second power distribution cabinet (2) and the second energy storage component, and the switches QF3 and QF4 are connected in series; One end of the switch QF5 is connected to the line between the switches QF1 and QF2 , and the other end is connected to the line between the switches QF3 and QF4 .

2. The energy storage power supply switching circuit according to claim 1, characterized in that: The mains power supply assembly comprises a mains power supply line (4), a mains power switch cabinet (5), a first transformer (6) and a second transformer (7); the mains power supply line (4) is electrically connected to the mains power switch cabinet (5); the mains power switch cabinet (5) is electrically connected to the first transformer (6); and the mains power switch cabinet (5) is electrically connected to the second transformer (7).

3. The energy storage power supply switching circuit according to claim 2, characterized in that: A switch is provided on the city network incoming line (4).

4. The energy storage power supply switching circuit according to claim 3, characterized in that: A switch is connected between the mains switch cabinet (5) and the input end of the first transformer (6), and a switch is connected between the mains switch cabinet (5) and the input end of the second transformer (7).

5. The energy storage power supply switching circuit according to claim 4, characterized in that: A switch is connected between the output end of the first transformer (6) and the first power distribution cabinet (1).

6. The energy storage power supply switching circuit according to claim 4, characterized in that: A switch is connected between the output end of the second transformer (7) and the second power distribution cabinet (2).

7. The energy storage power supply switching circuit according to claim 1, characterized in that: The first energy storage component comprises a first isolator (8), a first energy storage inverter (9) and a first energy storage battery (10); the first isolator (8) is electrically connected to the first energy storage inverter (9), and the first energy storage inverter (9) is electrically connected to the first energy storage battery (10).

8. The energy storage power supply switching circuit according to claim 7, characterized in that: The first isolator (8) is electrically connected to the switch QF2, and a switch is connected between the first isolator (8) and the first energy storage inverter (9).

9. The energy storage power supply switching circuit according to claim 1, characterized in that: The second energy storage component comprises a second isolator (11), a second energy storage inverter (12) and a second energy storage battery (13); the second isolator (11) is electrically connected to the second energy storage inverter (12), and the second energy storage inverter (12) is electrically connected to the second energy storage battery (13).

10. The energy storage power supply switching circuit according to claim 9, characterized in that: The second isolator (11) is electrically connected to the switch QF4, and a switch is connected between the second isolator (11) and the second energy storage inverter (12).

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