Charging Pile Power Scheduling System Based on Reconfigurable Matrix

Abstract

This invention discloses a charging pile power scheduling system based on a reconfigurable matrix. The output terminal of the three-phase AC input is connected to a front-end AC-DC module group and a third switch group. The third switch group is connected to the first terminal of a rear-end AC / DC-DC module group. The front-end AC-DC module group is connected to the moving terminal of the first switch group. The first stationary terminal of the first switch group is connected to the DC bus, and the second stationary terminal is connected to the input terminal of the central power matrix module. The second switch group is connected to the DC bus, and its output terminal is connected to the rear-end AC / DC-DC module group. The rear-end AC / DC-DC module group is connected to the input terminal of the central power matrix module. The output terminal of the central power matrix module is connected to the charging terminal group. This invention, through a simple electrical connection reconfiguration architecture, enables flexible power output from the central power matrix module and allows for dynamic expansion and access to photovoltaic modules and energy storage batteries based on the DC bus.

Description

Technical Field

[0001] This invention relates to the field of charging pile technology for new energy, and in particular to a charging pile power scheduling system based on a reconfigurable matrix. Background Technology

[0002] With the increasing popularity of electric vehicles, the demand for charging stations is growing daily. Existing charging stations, especially high-power DC charging stations, typically employ a fixed power conversion topology. This fixed power conversion topology has the following limitations:

[0003] 1) Fixed power output means that once the design is completed, the maximum output power of a single charging pile is fixed, and it is impossible to temporarily and cost-effectively upgrade the capacity according to the actual needs of the site.

[0004] 2) Poor compatibility: Traditional charging pile circuit structures are difficult to efficiently and safely connect to DC-type distributed energy sources such as photovoltaic power generation and energy storage batteries. To achieve integrated photovoltaic, energy storage, and charging, it is often necessary to add a large number of additional DC / DC conversion devices and complex control systems, resulting in high system costs, complex structures, and reduced efficiency.

[0005] 3) Insufficient flexibility, meaning it cannot dynamically adjust its internal energy flow path according to conditions such as grid load, peak and off-peak electricity prices, and whether renewable energy is connected, in order to achieve the goal of maximizing economic efficiency and green energy utilization.

[0006] Therefore, there is an urgent need for a new power scheduling scheme for charging piles to solve the above problems. Summary of the Invention

[0007] This invention provides a charging pile power scheduling system based on a reconfigurable matrix, which aims to solve the problem in the prior art that once a charging pile is designed, the maximum output power of a single charging pile is fixed, and it is also incompatible with DC distributed energy sources such as photovoltaic power generation and energy storage batteries.

[0008] This invention provides a charging pile power scheduling system based on a reconfigurable matrix, comprising a three-phase AC input terminal, a front-end AC-DC module group, a first switch group, a second switch group, a third switch group, a DC bus, a rear-end AC / DC-DC module group, a central power matrix module, and a charging terminal group. The input terminal of the three-phase AC input terminal is connected to a three-phase AC power grid. The output terminal of the three-phase AC input terminal is connected to the first terminal of the front-end AC-DC module group and also to the input terminal of the third switch group. The output terminal of the third switch group is connected to the first terminal of the rear-end AC / DC-DC module group. The second terminal of the front-end AC-DC module group is connected to the moving terminal of the first switch group. The first stationary terminal of the first switch group is connected to the DC bus. The second stationary terminal of the first switch group is connected to the... The input terminal of the central power matrix module is connected; the input terminal of the second switch group is connected to the DC bus, and the output terminal of the second switch group is connected to the first terminal of the subsequent AC / DC-DC module group; the second terminal of the subsequent AC / DC-DC module group is connected to the input terminal of the central power matrix module; the output terminal of the central power matrix module is connected to the charging terminal group; wherein, the central power matrix module is used to dynamically distribute the electrical energy provided by the three-phase AC power grid connected to the three-phase AC power input terminal to at least one charging terminal in the charging terminal group after passing through the preceding AC-DC module group and / or the subsequent AC / DC-DC module group under the combined control of the conduction or cutoff of the first switch group, the second switch group, and the third switch group, according to the charging power scheduling command of the internal controller.

[0009] In some embodiments, the pre-amplifier AC-DC module group includes multiple pre-amplifier AC-DC modules connected in parallel, and the first terminal of each pre-amplifier AC-DC module is connected to the output terminal of the three-phase AC input terminal.

[0010] In some embodiments, the downstream AC / DC-DC module group includes a plurality of downstream AC / DC-DC modules connected in parallel; wherein the total number of upstream AC / DC modules included in the upstream AC / DC module group is the same as the total number of downstream AC / DC-DC modules included in the downstream AC / DC-DC module group.

[0011] In some embodiments, the first switch group includes a plurality of first switches arranged in parallel, and the first switches are single-pole double-throw switches; wherein, the total number of first switches included in the first switch group is the same as the total number of front-stage AC-DC modules included in the front-stage AC-DC module group, the moving end of each first switch is connected to the second end of a corresponding front-stage AC-DC module in the front-stage AC-DC module group, the first stationary end of each first switch is connected to the DC bus, and the second stationary end of each first switch is connected to the input end of the central power matrix module.

[0012] In some embodiments, the second switch group includes a plurality of second switches arranged in parallel, and the second switches are single-pole single-throw switches; wherein, the total number of second switches included in the second switch group is the same as the total number of subsequent AC / DC-DC modules included in the subsequent AC / DC-DC module group, the input terminal of each second switch is connected to the DC bus, and the output terminal of each second switch is connected to a corresponding subsequent AC / DC-DC module in the subsequent AC / DC-DC module group.

[0013] In some embodiments, the third switch group includes multiple third switches arranged in parallel, and the third switches are single-pole single-throw switches; wherein, the total number of third switches included in the third switch group is the same as the total number of subsequent AC / DC-DC modules included in the subsequent AC / DC-DC module group, the input terminal of each third switch is connected to the output terminal of the three-phase AC input terminal, and the output terminal of each third switch is connected to a corresponding subsequent AC / DC-DC module in the subsequent AC / DC-DC module group.

[0014] In some embodiments, if the moving end of each first switch in the first switch group is connected to the first stationary end, each second switch in the second switch group is turned on and each third switch in the third switch group is turned off, then the central power matrix module corresponds to a photovoltaic-storage compatible mode, and the DC bus is used to extend the connection of photovoltaic modules and / or energy storage modules.

[0015] In some embodiments, if the moving end of each first switch in the first switch group is connected to the second stationary end, each second switch in the second switch group is turned off and each third switch in the third switch group is turned on, then the central power matrix module corresponds to a high-power output mode.

[0016] In some embodiments, when the central power matrix module corresponds to the high power output mode, each of the downstream AC / DC-DC modules in the downstream AC / DC-DC module group switches to AC input.

[0017] In some embodiments, the charging pile power scheduling system based on a reconfigurable matrix further includes a photovoltaic module and an energy storage module; the photovoltaic module is connected to the DC bus via a fourth switch group, and the energy storage module is connected to the DC bus via a fifth switch group.

[0018] This invention provides a charging pile power scheduling system based on a reconfigurable matrix, including a three-phase AC input terminal, a front-end AC-DC module group, a first switch group, a second switch group, a third switch group, a DC bus, a rear-end AC / DC-DC module group, a central power matrix module, and a charging terminal group. The input terminal of the three-phase AC input terminal is used to connect to a three-phase AC power grid. The output terminal of the three-phase AC input terminal is connected to the first terminal of the front-end AC-DC module group and also to the input terminal of the third switch group. The output terminal of the third switch group is connected to the first terminal of the rear-end AC / DC-DC module group. The second terminal of the front-end AC-DC module group is connected to the moving terminal of the first switch group. The first stationary terminal of the first switch group is connected to the DC bus. The second stationary terminal of the first switch group is connected to the input terminal of the central power matrix module. The input terminal of the second switch group is connected to the DC bus. The output terminal of the second switch group is connected to the first terminal of the rear-end AC / DC-DC module group. The second terminal of the rear-end AC / DC-DC module group is connected to the input terminal of the central power matrix module. The output terminal of the central power matrix module is connected to the charging terminal group. The embodiments of the present invention can achieve flexible power output of the central power matrix module through the architectural design of the front-end AC-DC module group, the back-end AC / DC-DC module group and the central power matrix module, and can also dynamically expand the access of photovoltaic modules and energy storage batteries based on the DC bus. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic block diagram of the circuit topology of a charging pile power scheduling system based on a reconfigurable matrix provided in an embodiment of the present invention;

[0021] Figure 2 The schematic block diagram of the circuit topology of the charging pile power scheduling system based on a reconfigurable matrix provided in the embodiments of the present invention is compatible with the photovoltaic-storage mode.

[0022] Figure 3The circuit topology of the charging pile power scheduling system based on a reconfigurable matrix provided in the embodiment of the present invention is shown in the high-power output mode. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0025] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0026] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0027] Please see Figure 1 ,in Figure 1 This is a schematic block diagram of the circuit topology of a charging pile power scheduling system based on a reconfigurable matrix, provided in an embodiment of the present invention. Figure 1As shown, the charging pile power scheduling system based on a reconfigurable matrix includes a three-phase AC input terminal 10, a front-end AC-DC module group 20, a first switch group 30, a second switch group 40, a third switch group 50, a DC bus 60, a rear-end AC / DC-DC module group 70, a central power matrix module 80, and a charging terminal group 90. The input terminal of the three-phase AC input terminal 10 is used to connect to a three-phase AC power grid (not shown). The output terminal of the three-phase AC input terminal 10 is connected to the first terminal of the front-end AC-DC module group 20 and also to the input terminal of the third switch group 50. The output terminal of the third switch group 50 is connected to the first terminal of the rear-end AC / DC-DC module group 70. The second terminal of the front-end AC-DC module group 20 is connected to the moving terminal of the first switch group 30. The first stationary terminal of the first switch group 30 is connected to the DC bus 60, and the second stationary terminal of the first switch group 30 is connected to the... The input terminal of the central power matrix module 80 is connected; the input terminal of the second switch group 40 is connected to the DC bus 60, and the output terminal of the second switch group 40 is connected to the first terminal of the subsequent AC / DC-DC module group 70; the second terminal of the subsequent AC / DC-DC module group 70 is connected to the input terminal of the central power matrix module 80; the output terminal of the central power matrix module 80 is connected to the charging terminal group 90; wherein, the central power matrix module 80 is used to dynamically distribute the electrical energy provided by the three-phase AC grid connected to the three-phase AC power input terminal 10 to at least one charging terminal 91 in the charging terminal group 90 after passing through the preceding AC-DC module group 20 and / or the subsequent AC / DC-DC module group 70 under the control of the on or off combination of the first switch group 30, the second switch group 40, and the third switch group 50, according to the charging power scheduling command of the internal controller.

[0028] In this embodiment, the charging pile power scheduling system based on a reconfigurable matrix can be specifically deployed in a charging station. The charging terminal group 90 includes multiple charging terminals 91, each of which can be considered a charging pile. When specifically applying this charging pile power scheduling system based on a reconfigurable matrix, the input terminal of the three-phase AC power input terminal 10 needs to be connected to the three-phase AC power grid to provide the main energy for the entire system. Each front-stage AC-DC module 21 in the front-stage AC-DC module group 20 has isolation functionality, and each rear-stage AC / DC-DC module 71 in the rear-stage AC / DC-DC module group 70 also has isolation functionality. Each front-stage AC-DC module 21 is used to convert AC power to DC power and provide electrical isolation, and each front-stage AC-DC module 21 operates independently. Each rear-stage AC / DC-DC module 71 is selectively connected to the output terminal of the front-stage AC / DC module 21 or an external DC power source. The DC bus 60 can be extended to connect photovoltaic module 100 and / or energy storage module 200 (such as lithium battery pack) according to actual power demand, and adopts photovoltaic-storage-DC-flexible technology to flexibly control and supply power to at least one charging terminal in the charging terminal group together with the central power matrix module.

[0029] It is important to note that the central power matrix module 80, as the core module of the system, is specifically used to dynamically distribute the electrical energy provided by the three-phase AC power grid connected to the three-phase AC power input terminal 10, under the control of the on / off combinations of the first switch group 30, the second switch group 40, and the third switch group 50, through the front-stage AC-DC module group 20 and / or the rear-stage AC / DC-DC module group 70, to at least one charging terminal 91 in the charging terminal group 90, according to the charging power scheduling instructions of the internal controller. Essentially, the central power matrix module 80 can be regarded as a configurable power routing unit, which can at least aggregate the DC power output from all the rear-stage AC / DC-DC modules 71 in the rear-stage AC / DC-DC module group 70 and dynamically distribute the electrical energy to at least one charging terminal 91 in the charging terminal group 90. As can be seen, through the architectural design of the front-end AC-DC module group, the back-end AC / DC-DC module group and the central power matrix module, the central power matrix module can flexibly output power by simply reconfiguring the electrical connections, and can also dynamically expand to connect photovoltaic modules and energy storage batteries based on the DC bus.

[0030] In some embodiments, such as Figure 1 As shown, the pre-stage AC-DC module group 20 includes multiple pre-stage AC-DC modules 21 arranged in parallel, and the first end of each pre-stage AC-DC module 21 is connected to the output end of the three-phase AC input terminal 10.

[0031] In this embodiment, the front-stage AC-DC module group 20 includes multiple front-stage AC-DC modules 21 connected in parallel. The specific number can be determined based on the charging function design requirements of the entire charging pile power scheduling system based on a reconfigurable matrix. That is, the greater the total power supplied to the external system by the charging pile power scheduling system based on the reconfigurable matrix, the greater the total number of front-stage AC-DC modules 21 included in the front-stage AC-DC module group 20. For example, in... Figure 1 The front-stage AC-DC module group 20 shown includes three front-stage AC-DC modules 21; other front-stage AC-DC modules 21 are omitted and not shown. This parallel connection allows the number of front-stage AC-DC modules in the front-stage AC-DC module group to be flexibly expanded according to actual needs.

[0032] In some embodiments, such as Figure 1 As shown, the downstream AC / DC-DC module group 70 includes multiple downstream AC / DC-DC modules 71 connected in parallel; wherein, the total number of upstream AC-DC modules 21 included in the upstream AC-DC module group 20 is the same as the total number of downstream AC / DC-DC modules 71 included in the downstream AC / DC-DC module group 70.

[0033] In this embodiment, similarly, the downstream AC / DC-DC module group 70 includes multiple downstream AC / DC-DC modules 71 connected in parallel. The specific number can be determined based on the charging function design requirements of the entire charging pile power scheduling system based on the reconfigurable matrix. That is, the greater the total power supplied by the charging pile power scheduling system based on the reconfigurable matrix, the greater the total number of downstream AC / DC-DC modules 71 included in the downstream AC / DC-DC module group 70. Furthermore, it is necessary to always maintain the same total number of front-stage AC-DC modules 21 included in the upstream AC-DC module group 20 as the total number of downstream AC / DC-DC modules 71 included in the downstream AC / DC-DC module group 70, with each downstream AC / DC-DC module 71 connected to a unique upstream AC-DC module 21. For example, in... Figure 1 The actual AC / DC-DC module group 70 shown includes three AC / DC-DC modules 71; other AC / DC-DC modules 71 are omitted and not shown. This parallel connection allows the number of AC / DC-DC modules in the AC / DC-DC module group to be flexibly expanded according to actual needs.

[0034] In some embodiments, such as Figure 1As shown, the first switch group 30 includes multiple first switches 31 connected in parallel, and each first switch 31 is a single-pole double-throw switch. The total number of first switches 31 in the first switch group 30 is the same as the total number of front-stage AC-DC modules 21 in the front-stage AC-DC module group 20. The moving end of each first switch 31 is connected to the second end of a corresponding front-stage AC-DC module 21 in the front-stage AC-DC module group 20. The first stationary end of each first switch 31 is connected to the DC bus 60, and the second stationary end of each first switch 31 is connected to the input end of the central power matrix module 80.

[0035] In this embodiment, the multiple parallel-connected first switches 31 in the first switch group 30 are specifically single-pole double-throw switches, which allows them to have corresponding circuit connections when in different conduction paths. Specifically, when the moving end of the first switch 31 is connected to the first stationary end, it indicates that a DC bus or similar device is required for DC power supply in the current operating mode; when the moving end of the first switch 31 is connected to the second stationary end, it indicates that a DC bus or similar device is not required in the current operating mode, and instead, each front-stage AC-DC module 21 in the front-stage AC-DC module group 20 has a direct connection with the central power matrix module 80.

[0036] In some embodiments, such as Figure 1 As shown, the second switch group 40 includes multiple second switches 41 connected in parallel, and each second switch 41 is a single-pole single-throw switch. The total number of second switches 41 included in the second switch group 40 is the same as the total number of subsequent AC / DC-DC modules 71 included in the subsequent AC / DC-DC module group 70. The input terminal of each second switch 41 is connected to the DC bus 60, and the output terminal of each second switch 41 is connected to a corresponding subsequent AC / DC-DC module 71 in the subsequent AC / DC-DC module group 70.

[0037] In this embodiment, the multiple parallel-connected second switches 41 in the second switch group 40 are specifically single-pole single-throw switches. Their on / off states affect the connection state between the DC bus 60 and each subsequent AC / DC-DC module 71 in the subsequent AC / DC-DC module group 70. Specifically, when each second switch 41 is on, the DC bus 60 is connected to each subsequent AC / DC-DC module 71 in the subsequent AC / DC-DC module group 70; when each second switch 41 is off, the DC bus 60 is disconnected from each subsequent AC / DC-DC module 71 in the subsequent AC / DC-DC module group 70.

[0038] In some embodiments, such as Figure 1As shown, the third switch group 50 includes multiple third switches 51 connected in parallel, and each third switch is a single-pole single-throw switch. The total number of third switches 51 in the third switch group 50 is the same as the total number of subsequent AC / DC-DC modules 71 in the subsequent AC / DC-DC module group 70. The input terminal of each third switch 51 is connected to the output terminal of the three-phase AC input terminal 10, and the output terminal of each third switch 51 is connected to a corresponding subsequent AC / DC-DC module 71 in the subsequent AC / DC-DC module group 70.

[0039] In this embodiment, the multiple parallel-connected third switches 51 in the third switch group 50 are specifically single-pole single-throw switches. Their on / off states affect the connection state between the three-phase AC input terminal 10 and each subsequent AC / DC-DC module 71 in the subsequent AC / DC-DC module group 70. Specifically, when each third switch 51 is on, the three-phase AC input terminal 10 is connected to each subsequent AC / DC-DC module 71 in the subsequent AC / DC-DC module group 70; when each third switch 51 is off, the three-phase AC input terminal 10 is disconnected from each subsequent AC / DC-DC module 71 in the subsequent AC / DC-DC module group 70.

[0040] In some embodiments, such as Figure 1 and Figure 2 As shown, if the moving end of each first switch 31 in the first switch group 30 is connected to the first stationary end, each second switch 41 in the second switch group 40 is turned on and each third switch 51 in the third switch group 50 is turned off, then the central power matrix module 80 corresponds to a compatible photovoltaic-storage mode, and the DC bus 60 is used to extend the connection between the photovoltaic module 100 and / or the energy storage module 200.

[0041] In this embodiment, in the photovoltaic-storage compatible mode, the AC current input to the three-phase AC input terminal 10 flows sequentially through the three-phase AC input terminal 10, the front-end AC-DC module 21, the rear-end AC / DC-DC module 71, the central power matrix module 80, and the charging terminal group 90. In the photovoltaic-storage compatible mode, the DC bus 60 can also be extended to connect the photovoltaic module 100 and / or the energy storage module 200 to achieve photovoltaic / energy storage charging, and the DC current flows sequentially through the photovoltaic module 100 and / or the energy storage module 200, the DC bus 60, the rear-end AC / DC-DC module 71, the central power matrix module 80, and the charging terminal group 90.

[0042] When the central power matrix module 80 corresponds to the photovoltaic-storage compatible mode, it includes grid charging, photovoltaic / storage charging, and hybrid charging (hybrid charging means that the grid and photovoltaic / storage can simultaneously supply power to the system, and the energy is combined at the downstream AC / DC-DC module or the central power matrix module). In the photovoltaic-storage compatible mode, the system retains a complete DC-DC conversion stage, providing interfaces and control capabilities (such as MPPT function and charge / discharge management) for DC sources of different voltage levels, realizing efficient and safe access and utilization of distributed energy resources, and improving the green energy utilization rate and operating economy of the system.

[0043] In some embodiments, such as Figure 1 and Figure 3 As shown, if the moving end of each first switch 31 in the first switch group 30 is connected to the second stationary end, each second switch 41 in the second switch group 40 is turned off and each third switch 51 in the third switch group 50 is turned on, then the central power matrix module 80 corresponds to the high power output mode.

[0044] In this embodiment, when the central power matrix module 80 corresponds to the high-power output mode, it may be that the charging station does not require superimposed photovoltaic or energy storage, and it needs to maximize the charging power of a single device (for example, to meet the demand for fast charging during peak charging periods on holidays). In this case, it is not necessary to provide the DC power provided by the photovoltaic module 100 and / or energy storage module 200 extended and connected to the DC bus 60 to the downstream AC / DC-DC module 71 and the central power matrix module 80, and only grid power is needed for charging. In the high-power output mode, the current flow direction of the AC power input at the three-phase AC input terminal 10 is sequentially through the three-phase AC input terminal 10, the upstream AC-DC module 21, the central power matrix module 80, and the charging terminal group 90.

[0045] In high-power output mode, the energy flow from the grid bypasses the downstream DC-DC conversion stage, reducing the number of power conversions and thus significantly reducing system losses. More importantly, the power from all upstream AC-DC modules can be integrated into the central power matrix module and centrally distributed, thereby increasing the maximum output power of the entire system and greatly enhancing the charging service capability of the reconfigurable matrix-based charging pile power scheduling system in specific scenarios.

[0046] In some embodiments, such as Figure 1 and Figure 3 As shown, when the central power matrix module 80 corresponds to the high power output mode, each of the subsequent AC / DC-DC modules 71 in the subsequent AC / DC-DC module group 70 switches to AC input.

[0047] In this embodiment, it should be noted that in high-power output mode, the subsequent AC / DC-DC module 71 can be switched to AC input (i.e., its DC-DC conversion function is bypassed or reconfigured to direct-through mode, and its input terminal is directly connected to the three-phase AC input terminal 10), thus becoming a subsequent AC-DC module (which can be understood as being exactly the same as the preceding AC-DC module 21). Therefore, the direction of AC current flow can be uniformly regarded as passing through the three-phase AC input terminal 10, the preceding AC-DC module 21, the central power matrix module 80, and the charging terminal group 90 in sequence. By optimizing the energy path in high-power output mode, the overall power can be significantly increased, effectively meeting the demand during temporary charging peaks.

[0048] As can be seen, the hardware system in this application can achieve two significantly different functional modes through simple reconstruction, while simultaneously meeting the requirements for peak power and green energy access, reducing equipment costs, and effectively avoiding excessive space occupation during the modification.

[0049] In some embodiments, such as Figure 1 and Figure 2 As shown, the charging pile power scheduling system based on a reconfigurable matrix also includes a photovoltaic module 100 and an energy storage module 200; the photovoltaic module 100 is connected to the DC bus 60 through a fourth switch group 110, and the energy storage module 200 is connected to the DC bus 60 through a fifth switch group 210.

[0050] In this embodiment, by connecting the photovoltaic module 100 to the DC bus 60 via the fourth switch group 110 and the energy storage module 200 via the fifth switch group 210, the charging pile power scheduling system of the reconfigurable matrix supports plug-and-play DC sources such as photovoltaics and energy storage, making it easy to build smart microgrids and integrated photovoltaic-energy storage-charging stations.

[0051] In summary, this invention provides a charging pile power scheduling system based on a reconfigurable matrix, including a three-phase AC input terminal, a front-end AC-DC module group, a first switch group, a second switch group, a third switch group, a DC bus, a rear-end AC / DC-DC module group, a central power matrix module, and a charging terminal group. The input terminal of the three-phase AC input terminal is used to connect to a three-phase AC power grid. The output terminal of the three-phase AC input terminal is connected to the first terminal of the front-end AC-DC module group and also to the input terminal of the third switch group. The output terminal of the third switch group is connected to the first terminal of the rear-end AC / DC-DC module group. The second terminal of the front-end AC-DC module group is connected to the moving terminal of the first switch group. The first stationary terminal of the first switch group is connected to the DC bus. The second stationary terminal of the first switch group is connected to the input terminal of the central power matrix module. The input terminal of the second switch group is connected to the DC bus. The output terminal of the second switch group is connected to the first terminal of the rear-end AC / DC-DC module group. The second terminal of the rear-end AC / DC-DC module group is connected to the input terminal of the central power matrix module. The output terminal of the central power matrix module is connected to the charging terminal group. The embodiments of the present invention can achieve flexible power output of the central power matrix module through the architectural design of the front-end AC-DC module group, the back-end AC / DC-DC module group and the central power matrix module, and can also dynamically expand the access of photovoltaic modules and energy storage batteries based on the DC bus.

[0052] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A charging pile power scheduling system based on a reconfigurable matrix, characterized in that, The system includes a three-phase AC input terminal, a pre-stage AC-DC module group, a first switch group, a second switch group, a third switch group, a DC bus, a post-stage AC / DC-DC module group, a central power matrix module, and a charging terminal group. The input terminal of the three-phase AC input terminal is used to connect to a three-phase AC power grid. The output terminal of the three-phase AC input terminal is connected to the first terminal of the pre-stage AC-DC module group and also to the input terminal of the third switch group. The output terminal of the third switch group is connected to the first terminal of the post-stage AC / DC-DC module group. The second terminal of the pre-stage AC-DC module group is connected to the moving terminal of the first switch group. The first stationary terminal of the first switch group is connected to the DC bus. The second stationary terminal of the first switch group is connected to the input terminal of the central power matrix module. The input terminals of the second switch group are connected to the DC bus, and the output terminals of the second switch group are connected to the first terminal of the subsequent AC / DC-DC module group; the second terminal of the subsequent AC / DC-DC module group is connected to the input terminal of the central power matrix module; the output terminal of the central power matrix module is connected to the charging terminal group; wherein, the central power matrix module is used to dynamically distribute the electrical energy provided by the three-phase AC grid connected to the three-phase AC input terminal to at least one charging terminal in the charging terminal group after passing through the preceding AC-DC module group and / or the subsequent AC / DC-DC module group under the combined control of the conduction or cutoff of the first switch group, the second switch group, and the third switch group, according to the charging power scheduling command of the internal controller; If the moving end of each first switch in the first switch group is connected to the first stationary end, each second switch in the second switch group is turned on and each third switch in the third switch group is turned off, then the central power matrix module corresponds to a photovoltaic-storage compatible mode, and the DC bus is used to extend the connection of photovoltaic modules and / or energy storage modules; when the central power matrix module corresponds to a photovoltaic-storage compatible mode, it includes grid charging, photovoltaic / energy storage charging and hybrid charging. Hybrid charging is when the grid and photovoltaic / energy storage simultaneously supply power to the charging pile power dispatching system based on the reconfigurable matrix, and the energy is converged at the downstream AC / DC-DC module group or the central power matrix module; in the photovoltaic-storage compatible mode, the current flow direction of the AC power input at the three-phase AC input terminal is sequentially through the three-phase AC input terminal, the upstream AC-DC module group, the downstream AC / DC-DC module group, the central power matrix module and the charging terminal group; If the moving end of each first switch in the first switch group is connected to the second stationary end, each second switch in the second switch group is turned off and each third switch in the third switch group is turned on, then the central power matrix module corresponds to the high power output mode; in the high power output mode, the current flow direction of the AC power input at the three-phase AC power input terminal is sequentially through the three-phase AC power input terminal, the front-end AC-DC module group, the central power matrix module and the charging terminal group; The pre-stage AC-DC module group includes multiple pre-stage AC-DC modules arranged in parallel, and the first terminal of each pre-stage AC-DC module is connected to the output terminal of the three-phase AC input terminal. The downstream AC / DC-DC module group includes multiple downstream AC / DC-DC modules connected in parallel; wherein, the total number of the upstream AC / DC modules included in the upstream AC / DC module group is the same as the total number of the downstream AC / DC-DC modules included in the downstream AC / DC-DC module group. Each front-stage AC-DC module in the front-stage AC-DC module group has isolation functionality, and each rear-stage AC / DC-DC module in the rear-stage AC / DC-DC module group also has isolation functionality; each front-stage AC-DC module is used to convert AC power to DC power and provide electrical isolation, and each front-stage AC-DC module operates independently; each rear-stage AC / DC-DC module is selectively connected to the output terminal of the front-stage AC / DC module or an external DC power source. When the central power matrix module is in high power output mode, each AC / DC-DC module in the downstream AC / DC-DC module group is switched to AC input; wherein, in high power output mode, the DC-DC conversion function of the downstream AC / DC-DC module group is bypassed or reconfigured to direct mode, and the input terminal is directly connected to the three-phase AC input terminal.

2. The charging pile power scheduling system based on a reconfigurable matrix according to claim 1, characterized in that, The first switch group includes multiple first switches connected in parallel, and each first switch is a single-pole double-throw switch. The total number of first switches in the first switch group is the same as the total number of front-stage AC-DC modules in the front-stage AC-DC module group. The moving end of each first switch is connected to the second end of a corresponding front-stage AC-DC module in the front-stage AC-DC module group. The first stationary end of each first switch is connected to the DC bus, and the second stationary end of each first switch is connected to the input end of the central power matrix module.

3. The charging pile power scheduling system based on a reconfigurable matrix according to claim 2, characterized in that, The second switch group includes multiple second switches connected in parallel, and each second switch is a single-pole single-throw switch; wherein, the total number of second switches included in the second switch group is the same as the total number of subsequent AC / DC-DC modules included in the subsequent AC / DC-DC module group, the input terminal of each second switch is connected to the DC bus, and the output terminal of each second switch is connected to a corresponding subsequent AC / DC-DC module in the subsequent AC / DC-DC module group.

4. The charging pile power scheduling system based on a reconfigurable matrix according to claim 3, characterized in that, The third switch group includes multiple third switches connected in parallel, and each third switch is a single-pole single-throw switch. The total number of third switches in the third switch group is the same as the total number of subsequent AC / DC-DC modules in the subsequent AC / DC-DC module group. The input terminal of each third switch is connected to the output terminal of the three-phase AC input terminal, and the output terminal of each third switch is connected to a corresponding subsequent AC / DC-DC module in the subsequent AC / DC-DC module group.

5. The charging pile power scheduling system based on a reconfigurable matrix according to any one of claims 1-4, characterized in that, It also includes a photovoltaic module and an energy storage module; the photovoltaic module is connected to the DC bus through a fourth switch group, and the energy storage module is connected to the DC bus through a fifth switch group.

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