A multi-power-supply flexible switching power supply circuit

Abstract

The utility model relates to a kind of multi-power supply flexible switching power supply circuit, involving electric energy storage technology field, including first input power supply, second input power supply, energy storage converter and microgrid;The output of the first input power supply and the output of second input power supply are in series to first node, and first node is electrically connected with the input of energy storage converter by first circuit breaker;The microgrid is electrically connected with the bidirectional transmission end of energy storage converter, and the output of energy storage converter is electrically connected with load side, and the output of the second input power supply is electrically connected with load side by bypass circuit breaker;It can solve the problem of unstable power supply state when power supply mode switches.

Description

Technical Field

[0001] The utility model relates to the field of power energy storage technology, specifically to a power supply circuit with flexible switching between multiple power sources. Background Technology

[0002] Traditional energy storage relies on a large power grid, requiring additional solar or other power inputs to ensure its normal operation. However, considering the on-site grid construction and environment, many application scenarios often lack effective power support. Special scenarios such as remote mountainous areas, mining areas, and islands share common characteristics: 1. Difficult grid installation: In remote mountainous areas, the rugged terrain makes delivering electricity extremely difficult; 2. High investment costs: For example, when constructing oil wells, the uneven distribution and uncertain distances between wells necessitate the installation of cables or transformers to ensure power supply, resulting in significant investment; 3. Island power supply typically uses wind turbines combined with solar power, but unrestricted solar installation can easily cause grid fluctuations or even grid collapse. Therefore, in these special scenarios, there is an urgent need for a microgrid device that can operate together with the main power grid or in "island mode" so that it can switch between grid power supply and microgrid power supply when necessary and in actual operation, and ensure the stability of power supply status when switching power supply modes. Utility Model Content

[0003] The purpose of this invention is to provide a power supply circuit with flexible switching between multiple power sources, which can solve the problem of unstable power supply status when switching power supply modes.

[0004] This utility model is achieved through the following technical solution: A power supply circuit with flexible switching of multiple power sources includes a first input power source, a second input power source, an energy storage converter, and a microgrid. The output terminals of the first and second input power sources are connected in series to a first node, and the first node is electrically connected to the input terminal of the energy storage converter through a first circuit breaker. The microgrid is electrically connected to the bidirectional transmission terminal of the energy storage converter, the output terminal of the energy storage converter is electrically connected to the load side, and the output terminal of the second input power source is electrically connected to the load side through a bypass circuit breaker.

[0005] Furthermore, both the first input power supply and the second input power supply are AC power supplies.

[0006] Furthermore, the first input power supply includes a switching switch, a main power supply, and a backup power supply, wherein the output terminal of the switching switch is connected to the first node, and the two input terminals of the switching switch are electrically connected to the main power supply and the backup power supply, respectively.

[0007] Furthermore, the main power supply is electrically connected to the switching switch via the second circuit breaker, and the backup power supply is electrically connected to the switching switch via the third circuit breaker.

[0008] Furthermore, the microgrid includes a photovoltaic array, a DC-DC converter, and an energy storage battery. The photovoltaic array is electrically connected to the DC-DC converter, the DC-DC converter is electrically connected to the bidirectional transmission terminal of the energy storage converter and the charging terminal of the energy storage battery, and the discharging terminal of the energy storage battery is electrically connected to the bidirectional transmission terminal of the energy storage converter.

[0009] Furthermore, the DC converter is configured as multiple units, and the photovoltaic array includes multiple sets of photovoltaic modules, with each DC converter electrically connected to one set of photovoltaic panels.

[0010] Furthermore, the energy storage converter is specifically BTLA-PMA060-A011-H.

[0011] Furthermore, the energy storage converter is electrically connected to the load side via a fourth circuit breaker.

[0012] The technical solution of this utility model has at least the following advantages and beneficial effects: This utility model discloses a power supply circuit with flexible switching between multiple power sources. By setting a series structure of the first input power source and the second input power source, and combining the coordinated control of the energy storage converter and the microgrid, seamless switching between grid power supply and microgrid power supply modes is realized. This effectively avoids problems such as voltage fluctuations and current surges that may occur during mode switching, and significantly improves the stability and reliability of the power supply system. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a module structure of the present invention; Figure 2 This is a schematic diagram of a circuit structure according to the present invention.

[0014] Reference numerals in the attached diagram: 1. First input power supply; 11. Switch; 12. Main power supply; 13. Backup power supply; 2. Second input power supply; 3. First circuit breaker; 4. Energy storage converter; 5. Microgrid; 51. Photovoltaic array; 52. DC converter; 53. Energy storage battery; 6. Bypass circuit breaker; 7. Second circuit breaker; 8. Third circuit breaker; 9. Fourth circuit breaker; 10. Load side. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0016] Example 1 like Figures 1-2 The power supply circuit shown includes a first input power supply 1, a second input power supply 2, an energy storage converter 4, and a microgrid 5. The output terminals of the first input power supply 1 and the second input power supply 2 are connected in series to a first node, and the first node is electrically connected to the input terminal of the energy storage converter 4 through a first circuit breaker 3. The first input power supply 1 is a power source generated by the grid or a generator, and the second input power supply 2 is a power source generated by wind power or other AC power sources. That is, both the first input power supply 1 and the second input power supply 2 are AC power sources, and the first circuit breaker 3 is used to control whether the first input power supply 1 or the second input power supply 2 can be input to the energy storage converter 4. In addition, when the first input power source 1 is the power generated by the generator, the first input power source 1 includes a switching switch 11, a main power source 12, and a backup power source 13. The output terminal of the switching switch 11 is connected to the first node, and the two input terminals of the switching switch 11 are electrically connected to the main power source 12 and the backup power source 13, respectively. By adopting a one-main-one-backup configuration, the first input power source 1 can still maintain effective power supply when the main generator fails, thereby improving the power supply efficiency of this circuit. Furthermore, the main power source 12 is electrically connected to the switching switch 11 through the second circuit breaker 7, and the backup power source 13 is electrically connected to the switching switch 11 through the third circuit breaker 8. The second circuit breaker 7 and the third circuit breaker 8 control the activation of the main power source 12 and the backup power source 13, respectively.

[0017] The microgrid 5 is electrically connected to the bidirectional transmission terminal of the energy storage converter 4, and the output terminal of the energy storage converter 4 is electrically connected to the load side 10. The output terminal of the second input power supply 2 is electrically connected to the load side 10 through the bypass circuit breaker 6. It should be noted that the energy storage converter 4 is specifically model BTLA-PMA060-A011-H. This model of energy storage converter 4 has both grid-connected and off-grid modes, and also has the functions of rectification: converting AC power into controllable DC power, and inversion: converting DC power into stable and clean AC power. In addition, the energy storage converter 4 is electrically connected to the load side 10 through the fourth circuit breaker 9. The bypass circuit breaker 6 can also close when the microgrid 5 needs to be maintained, and at the same time open the fourth circuit breaker 9, so that the second input power supply 2 directly supplies power to the load side 10, and the microgrid 5 and the energy storage converter 4 will not be energized, which makes it convenient to maintain the microgrid 5 and the energy storage converter 4 without shutting down the load side 10.

[0018] The specific operation of energy storage converter 4 is as follows: When the host computer detects that the amount of electricity stored in microgrid 5 is higher than the sufficient threshold, the host computer will control the energy storage converter 4 to switch to off-grid mode, and the microgrid 5 will supply power to the load. When the host computer detects that the amount of electricity stored in the microgrid 5 is lower than the sufficient threshold, the host computer will control the energy storage converter 4 to switch to grid-connected mode. The host computer will cut off the second input power supply 2 and control the first input power supply 1 to be input to the energy storage converter 4. The energy storage converter 4 will rectify the power output from the first input power supply 1 and then output it to the microgrid 5 for storage, thereby increasing the amount of electricity stored in the microgrid 5. At the same time, the bypass circuit breaker 6 will be closed, and the second input power supply 2 will supply power to the load side 10. When the host computer detects that the amount of electricity stored in the microgrid 5 is lower than the sufficient threshold, if the first input power supply 1 cannot output stable power, the host computer will control the energy storage converter 4 to switch to grid-connected mode, the host computer will cut off the first input power supply 1, and at the same time close the bypass circuit breaker 6, and control the second input power supply 2 to be input to the energy storage converter 4 and the load end respectively. The energy storage converter 4 rectifies the power output by the second input power supply 2 and then outputs it to the microgrid 5 for storage, thereby increasing the amount of electricity stored in the microgrid 5. That is, the second input power supply 2 supplies power to the load side 10 and the microgrid 5 respectively. When the host computer detects that the amount of electricity stored in the microgrid 5 is lower than the sufficient threshold, and neither the first input power supply 1 nor the second input power supply 2 can output stable power, the energy storage converter 4 will stop supplying power to the load side 10.

[0019] Example 2 As one embodiment, the microgrid 5 includes a photovoltaic array 51, a DC-DC converter 52, and an energy storage battery 53. The photovoltaic array 51 is electrically connected to the DC-DC converter 52, and the DC-DC converter 52 is electrically connected to the bidirectional transmission terminal of the energy storage converter 4 and the charging terminal of the energy storage battery 53. The discharging terminal of the energy storage battery 53 is electrically connected to the bidirectional transmission terminal of the energy storage converter 4. The photovoltaic array 51 can convert solar energy into DC power output, while the DC-DC converter 52 can convert the DC power output by the photovoltaic array 51 into a specific DC power. The converted DC power can be stored in the energy storage battery 53 or output to the load side 10 through the energy storage converter 4.

[0020] Furthermore, multiple DC converters 52 are configured, and the photovoltaic array 51 includes multiple sets of photovoltaic modules. Multiple DC converters 52 are electrically connected to multiple sets of photovoltaic panels one by one. Since there are a large number of photovoltaic panels in the photovoltaic array 51, and due to the differences in the installation positions of the photovoltaic panels, the power generation efficiency of each photovoltaic panel is different. Therefore, 6-8 photovoltaic panels are connected in series to form a photovoltaic module, and one DC converter 52 is responsible for one photovoltaic module. Finally, multiple DC converters 52 are connected in parallel to the energy storage battery 53 and the energy storage converter 4, so that the overall current conversion efficiency of the photovoltaic array 51 is higher.

[0021] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A power supply circuit with flexible switching between multiple power sources, characterized in that, It includes a first input power supply (1), a second input power supply (2), an energy storage converter (4), and a microgrid (5); the output terminals of the first input power supply (1) and the second input power supply (2) are connected in series to a first node, and the first node is electrically connected to the input terminal of the energy storage converter (4) through a first circuit breaker (3); the microgrid (5) is electrically connected to the bidirectional transmission terminal of the energy storage converter (4), the output terminal of the energy storage converter (4) is electrically connected to the load side (10), and the output terminal of the second input power supply (2) is electrically connected to the load side (10) through a bypass circuit breaker (6).

2. The power supply circuit with flexible switching of multiple power sources according to claim 1, characterized in that: Both the first input power supply (1) and the second input power supply (2) are AC power supplies.

3. The power supply circuit with flexible switching of multiple power sources according to claim 1, characterized in that: The first input power supply (1) includes a switching switch (11), a main power supply (12) and a backup power supply (13), wherein the output terminal of the switching switch (11) is connected to the first node, and the two input terminals of the switching switch (11) are electrically connected to the main power supply (12) and the backup power supply (13) respectively.

4. The power supply circuit with flexible switching of multiple power sources according to claim 3, characterized in that: The main power supply (12) is electrically connected to the switching switch (11) through the second circuit breaker (7), and the backup power supply (13) is electrically connected to the switching switch (11) through the third circuit breaker (8).

5. The power supply circuit with flexible switching of multiple power sources according to claim 1, characterized in that: The microgrid (5) includes a photovoltaic array (51), a DC converter (52), and an energy storage battery (53). The photovoltaic array (51) is electrically connected to the DC converter (52). The DC converter (52) is electrically connected to the bidirectional transmission end of the energy storage converter (4) and the charging end of the energy storage battery (53). The discharging end of the energy storage battery (53) is electrically connected to the bidirectional transmission end of the energy storage converter (4).

6. The power supply circuit with flexible switching of multiple power sources according to claim 5, characterized in that: The DC converter (52) is configured as multiple, and the photovoltaic array (51) includes multiple sets of photovoltaic modules. The multiple DC converters (52) are electrically connected to the multiple sets of photovoltaic panels one by one.

7. The power supply circuit with flexible switching of multiple power sources according to claim 1, characterized in that: The energy storage converter (4) is specifically BTLA-PMA060-A011-H.

8. The power supply circuit with flexible switching of multiple power sources according to claim 1, characterized in that: The energy storage converter (4) is electrically connected to the load side (10) via the fourth circuit breaker (9).

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