Bypass architecture and control method thereof

Abstract

The application discloses a bypass architecture and a control method thereof, and the bypass architecture is applied to a load power supply system and comprises a first control switch, a second control switch, a bypass control switch and a controller; a power grid and an inverter group are connected with a key load through the first control switch and the second control switch respectively; the bypass control switch is installed in a power distribution cabinet, the bypass control switch is in control connection with the first control switch, and a interlocking mechanism with advanced response during operation is arranged on the bypass control switch; and the controller is in control connection with the interlocking mechanism, the first control switch, the second control switch and the inverter group. The application has the beneficial effects that the technical scheme of the application can omit the bypass switch, thereby reducing the system cost and the volume of the power distribution cabinet. Moreover, the bypass power supply mode and the normal working mode can be seamlessly switched, and the power supply continuity of the key load is ensured.

Description

Technical Field

[0001] This application relates to the field of new energy power generation technology, and in particular to a bypass architecture and its control method. Background Technology

[0002] like Figure 1 The diagram shows an existing load power supply system. The critical load 300 can be powered by multiple power sources, such as the grid 100, generator 200, grid-connected inverter 401, and energy storage inverter 402. The grid 100 is connected to the load switch QF4 at the input of the critical load 300 via a power supply branch formed by a circuit breaker QF1 and a contactor KM1 connected in series. The generator 200 is connected to the load switch QF4 at the input of the critical load 300 via a power supply branch formed by a circuit breaker QF2 and a contactor KM2 connected in series. The grid-connected inverter 401 is connected to the load switch QF4 at the input of the critical load 300 via an output switch QF5. The energy storage inverter 402 is connected to the load switch QF4 at the input of the critical load 300 via output switches QF61~QF6N. The output of the grid 100 is also directly connected to the critical load 300 via a manual bypass switch QF3.

[0003] When the system is operating normally, the critical load 300 can be powered simultaneously by a single power source or multiple power sources as needed. The control switch corresponding to the power source is closed and conducting, while the load switch QF4 is closed and the manual bypass switch QF3 remains open. When the grid-connected inverter 401 and the energy storage inverter 402 require maintenance, the contactor KM2 is opened, simultaneously controlling the output voltage of the grid-connected inverter 401 and the energy storage inverter 402 to match the grid voltage. When the inverter detects that its output voltage matches the grid voltage, it can operate the bypass switch QF3 to close. After the bypass switch QF3 is closed, the load switch QF4 is opened, allowing the grid 100 to power the critical load 300 through a bypass. However, in the above-mentioned multi-power source load power supply system, the manual bypass switch QF3 needs to be externally mounted. This not only increases the cost and installation space of the distribution cabinet, but also requires logical interlocking between the manual bypass switch QF3 and the load switch QF4, which increases the design difficulty of the load switch QF4. Summary of the Invention

[0004] One objective of this application is to provide a bypass architecture that can address at least one of the deficiencies in the aforementioned background technology.

[0005] Another objective of this application is to provide a control method for a bypass architecture that can solve at least one of the defects in the aforementioned background art.

[0006] To achieve at least one of the above objectives, the technical solution adopted in this application is as follows: a bypass architecture applied to a load power supply system, including a first control switch, a second control switch, a bypass control switch, an interlocking mechanism, and a controller; the power grid and the inverter group are respectively connected to the critical load through the first control switch and the second control switch; the bypass control switch and the interlocking mechanism are both installed in the distribution cabinet; the bypass control switch is manually closed to force the first control switch to remain closed; the interlocking mechanism cooperates with the bypass control switch, and the interlocking mechanism is adapted to respond in advance when the bypass control switch is operated; the controller, based on the response of the interlocking mechanism, triggers the disconnection control of the second control switch and the phase-locked control of the inverter group.

[0007] Preferably, the interlocking mechanism blocks or locks the bypass control switch so that when bypassing the inverter group, the interlocking mechanism is first driven to release the blockage or lock on the bypass control switch, at which time the controller is triggered based on the position change of the interlocking mechanism.

[0008] Preferably, the interlocking mechanism includes a structural member that blocks or locks the bypass control switch, and the structural member is physically connected to the controller; when bypassing the inverter group, the controller is triggered based on the position change of the structural member during the process of removing the structural member to prepare for operating the bypass control switch.

[0009] Preferably, the interlocking mechanism includes a structural component and a micro switch. The structural component is used to block or lock the bypass control switch. The micro switch is physically connected to the structural component and electrically connected to the controller. When bypassing the inverter group, during the process of removing the structural component to prepare for operating the bypass control switch, the micro switch is triggered to change its state based on the position change of the structural component. Subsequently, the controller is triggered according to the drive signal generated by the state change of the micro switch.

[0010] Preferably, the first control switch is a circuit breaker or a circuit breaker.

[0011] Preferably, the first control switch includes a circuit breaker and a contactor connected in series, and the bypass control switch forces the contactor to remain engaged.

[0012] Preferably, the inverter group includes a grid-connected inverter and at least one energy storage inverter; the second control switch includes a first output switch and a second output switch respectively disposed at the output terminals of the grid-connected inverter and the energy storage inverter; for multiple energy storage inverters, the second control switch further includes a centralized control switch, and the multiple energy storage inverters are connected in parallel to the centralized control switch through corresponding second output switches, so that the energy storage inverters are connected to critical loads through the centralized control switch.

[0013] Preferably, the load power supply system is provided with at least one other power source in addition to the power grid and the inverter group; the bypass architecture also includes at least one third control switch, and each other power source is connected to the critical load through the corresponding third control switch; the third control switch is connected to the controller so that when the controller is triggered in advance, the third control switch disconnects the connection between the other power source and the critical load.

[0014] A control method for the aforementioned bypass architecture includes the following steps: when the load power supply system is operating normally, the bypass control switch located in the distribution cabinet remains open and is blocked or locked by an interlocking mechanism; when the load power supply system requires maintenance of the inverter group, the interlocking mechanism is first operated to release the blocking or locking of the bypass control switch; based on the state change of the interlocking mechanism, during this process, the controller located in the distribution cabinet controls the inverter group to perform phase-locking to synchronize the output voltage with the grid voltage; then the bypass control switch is operated to forcibly close the first control switch; after the first control switch is closed, the second control switch is opened to execute a bypass power supply mode that supplies power to the critical load through the grid.

[0015] Preferably, the controller performs a self-test on the inverter group. If the inverter group fails the self-test, the grid continues to maintain the bypass power supply mode to supply power to the critical load. Otherwise, after receiving the start command, the controller sends a closing command to the first control switch. At the same time, the inverter group is started to operate normally and its output voltage is kept synchronized with the grid voltage. When the grid voltage is synchronized with the output voltage of the inverter group, the inverter group prompts to close the second control switch again. Then, the bypass control switch is operated to open and is blocked or locked again through the interlocking mechanism to exit the bypass power supply mode. The switching process is completed after the controller detects that the bypass power supply mode has been exited.

[0016] Compared with the prior art, the beneficial effects of this application are as follows:

[0017] Compared to traditional bypass switches whose current rating exceeds the load's rated current, resulting in a bulky external bypass switch, the technical solution of this application eliminates the need for a bypass switch, thereby reducing system costs and the size of the distribution cabinet. Furthermore, the bypass power supply mode and normal operating mode can be seamlessly switched, ensuring continuous power supply to critical loads. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the architecture of an existing load power supply system.

[0019] Figure 2 This is a schematic diagram of one example of the bypass architecture of this application.

[0020] Figure 3 This is a schematic diagram of another example of the bypass architecture of this application.

[0021] Figure 4 This is a schematic diagram illustrating yet another example of the bypass architecture of this application.

[0022] Figure 5 This is a schematic diagram illustrating the workflow of the bypass architecture of this application entering the bypass power supply mode.

[0023] Figure 6 This is a schematic diagram illustrating the workflow of the bypass architecture of this application during the restart of the inverter group after maintenance is completed.

[0024] In the diagram: Grid 100, Generator 200, Critical Load 300, Grid-connected Inverter 401, Energy Storage Inverter 402, Central Control Switch 403, Distribution Cabinet 5, Structural Component 501, Micro Switch 502. Detailed Implementation

[0025] The present application will now be further described in conjunction with specific embodiments. It should be noted that, in the description of this specification, the use of terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicates that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0026] In the description of this application, it should be noted that the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., which indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of this application.

[0027] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0028] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0031] One aspect of this application provides a bypass architecture for use in a load power supply system; such as Figure 2As shown, one preferred embodiment includes a first control switch, a second control switch, a bypass control switch QF30, an interlocking mechanism, and a controller (not shown). The power grid 100 and the inverter group are connected to the critical load 300 via the first and second control switches, respectively. The bypass control switch QF30 and the interlocking mechanism are both installed in the distribution cabinet 5. The bypass control switch QF30 is connected to the first control switch, and the bypass control switch QF30 can be manually closed to force the first control switch to remain closed. The interlocking mechanism works in conjunction with the bypass control switch QF30, and can respond in advance of the operation of the bypass control switch QF30 before its closure. The controller can be installed inside the distribution cabinet 5 or externally placed within it, depending on the specific needs of those skilled in the art. The controller is connected to the interlocking mechanism, the first control switch, the second control switch, and the inverter group. Based on the response of the interlocking mechanism, the controller can trigger the disconnection control of the second control switch and the phase-locked loop control of the inverter group.

[0032] Specifically, when the load power supply system is in normal operating mode, the critical load 300 can be powered by the inverter group and / or the power grid 100. That is, when the output power of the inverter group meets the needs of the critical load 300, power is supplied to the critical load 300 through the inverter group; during this process, the first control switch is open and the second control switch is closed. When the output power of the inverter group does not meet the needs of the critical load 300, power is supplied to the critical load 300 simultaneously through the inverter group and the power grid 100; during this process, both the first and second control switches need to be closed. Simultaneously, during the above process, the bypass control switch QF30 is in the open state, meaning that the bypass control switch QF30 withdraws its control over the first control switch.

[0033] When the inverter group is shut down for maintenance, in order to ensure the normal operation of the critical load 300, it is necessary to supply power to the critical load 300 separately through the grid 100. That is, the load power supply system needs to execute the bypass power supply mode. The specific process of the load power supply system executing the bypass power supply mode through the above-mentioned bypass architecture is as follows: the bypass control switch QF30 is closed manually to bypass the inverter group. However, before the bypass control switch QF30 is closed, an interlocking mechanism is triggered. The response of the interlocking mechanism triggers the controller, which can then complete the phase-locking of the inverter group before the bypass control switch QF30 is closed. That is, the output voltage of the inverter group is controlled to be in phase with the grid voltage, so that the inverter group can quickly achieve grid connection after maintenance is completed. After the inverter group completes the phase-locking, the bypass control switch QF30 can be closed manually, which will then force the first control switch to close. After the first control switch is closed, the controller can control the second control switch to open to ensure that the power supply circuit formed by the bypass power supply mode will not interfere with the maintenance of the inverter group. That is, regardless of whether the first control switch is closed or open, the first control switch will remain closed until the bypass control switch QF30 is disconnected, thereby forming a power supply circuit between the power grid 100 and the critical load 300 to supply power to the critical load 300.

[0034] Understandably, traditional bypass switches QF3 are bulky and require external mounting due to their current rating exceeding the load's rated current. The technical solution of this application eliminates the need for bypass switch QF3 and its corresponding external hardware circuit, effectively reducing system cost and the size of the distribution cabinet 5. Specifically, the technical solution of this application only includes a bypass control switch QF30 within the distribution cabinet 5. The bypass control switch QF30 does not need to be physically connected between the critical load 300 and the power grid 100; it only needs to be logically controlled by the first control switch that controls the connection and disconnection of the power grid 100. Based on this bypass architecture, seamless switching between bypass power supply mode and normal operation mode can be achieved, ensuring the continuity of power supply to the critical load 300. Furthermore, during bypass power supply mode, the early response of the interlocking mechanism ensures that when the bypass control switch QF30 is closed, the inverter group is in a locked state, and the connection to the critical load 300 is broken by the opening of the second control switch.

[0035] In this embodiment, there are various specific structural types of the first control switch. For ease of understanding, two specific examples will be used to illustrate this in detail below.

[0036] One example is, Figure 2As shown, the first control switch can be implemented in a conventional manner, comprising a circuit breaker QF1 and a contactor KM1 connected in series. The bypass control switch QF30 can be connected to the contactor KM1 for control, so that when the bypass power supply mode is executed, after the bypass control switch QF30 is manually closed, the contactor KM1 can be forcibly kept energized.

[0037] It is important to understand that circuit breaker QF1 primarily performs circuit breaking protection when a fault occurs in the power grid 100. When implementing normal operating mode and bypass operating mode of the load power supply system, circuit breaker QF1 can remain closed. In the control of contactor KM1 by bypass control switch QF30, bypass control switch QF30 can be considered as the energizing switch for the electromagnetic system of contactor KM1; that is, after bypass control switch QF30 is closed, the electromagnetic system of contactor KM1 will be energized and conduct to generate magnetic force for contact engagement. The specific structure and operating principle of contactor KM1 and circuit breaker QF1 are well-known to those skilled in the art and will not be described in detail here.

[0038] Another example, such as Figure 3 As shown, the first control switch includes only circuit breaker QF1 or contactor KM1; taking circuit breaker QF1 as an example, the bypass control switch QF30 can be connected to circuit breaker QF1 for control, so that when the bypass power supply mode is executed, circuit breaker QF1 can be controlled to be in a forced closed state by manually closing the bypass control switch QF30.

[0039] In this embodiment, as Figures 2 to 4 As shown, the inverter group includes a grid-connected inverter 401 and at least one energy storage inverter 402; the second control switch includes a first output switch QF5 and second output switches QF61~QF6N respectively disposed at the output terminals of the grid-connected inverter 401 and the energy storage inverter 402; where N represents the number of energy storage inverters 402. The controller can simultaneously establish control connections with the first output switch QF5 and the second output switches QF61~QF6N, as well as establish communication connections with the grid-connected inverter 401 and all the energy storage inverters 402; thus, when the load power supply system executes bypass power supply mode, after being triggered, the controller can control the grid-connected inverter 401 and all the energy storage inverters 402 to perform phase-locking, and then control the first output switch QF5 and the second output switches QF61~QF6N to simultaneously disconnect.

[0040] It is understandable that the first output switch QF5 and the second output switches QF61~QF6N can be of various types, such as circuit breakers or contactors. Their specific structures and working principles are well known to those skilled in the art, and they can choose according to their actual needs.

[0041] It's important to understand that, due to the limited number of data interfaces on the controller, in scenarios with more than one energy storage inverter 402, if the controller is connected to the second output switch installed at the output terminal of each energy storage inverter 402, it may result in an insufficient number of data interfaces. Therefore, as... Figure 4 As shown, in a scenario with multiple energy storage inverters 402, the second control switch also includes a centralized control switch 403. Multiple energy storage inverters 402 are connected in parallel to the centralized control switch 403 via corresponding second output switches QF61~QF6N, allowing them to connect to the critical load 300 through the centralized control switch 403. The controller can be connected to the centralized control switch 403, so that in bypass power supply mode, the controller only needs to disconnect the centralized control switch 403 to disconnect all energy storage inverters 402 from the critical load 300. The specific structure and working principle of the centralized control switch 403 are well-known to those skilled in the art and will not be described in detail here.

[0042] In this embodiment, as Figures 2 to 4 As shown, in addition to the inverter group and the power grid 100, the load power supply system can also supply power to the critical load 300 through at least one other power source; there are various types of other power sources, commonly including generators 200 and fuel cells. The bypass architecture of this application also includes at least one third control switch, and each other power source is connected to the critical load 300 through a corresponding third control switch. Simultaneously, the third control switch is also connected to the controller, so that when the controller is triggered in advance, the third control switch, under the control of the controller, disconnects the connection between the other power sources and the critical load 300.

[0043] It is understandable that there are various structural types of the third control switch; for example... Figure 2 As shown, the third control switch includes a circuit breaker QF2 connected in series and a contactor KM2. The controller can then connect to the contactor KM2, thereby controlling the opening and closing of the contactor KM2 to disconnect and connect the generator 200 to the critical load 300. For example... Figure 3 and Figure 4 As shown, the third control switch may also include only the circuit breaker QF2. In this case, the controller can be connected to the circuit breaker QF2 to control the opening and closing of the circuit breaker QF2 to disconnect and connect the generator 200 and the critical load 300.

[0044] In this embodiment, there are various specific structures for the interlocking mechanism used to trigger the controller when the bypass control switch QF30 is responded to in advance. Specifically, the early response method of the interlocking mechanism can be either physical drive or signal drive; the method of triggering the controller through the response of the interlocking mechanism can also be either physical trigger or signal trigger. Among these, the early response of the interlocking mechanism is the key to the bypass architecture of this application. Compared with the signal drive method, the physical drive method has better stability. Therefore, in this embodiment, the early response method of the interlocking mechanism is preferably adopted as the physical drive method. For ease of understanding, a detailed description will be provided below with specific examples.

[0045] Specifically, the interlocking mechanism blocks or locks the bypass control switch QF30 so that when the inverter group is bypassed, i.e., when the bypass power supply mode is executed, the interlocking mechanism is first driven to release the blocking or locking of the bypass control switch QF30. At this time, the controller is triggered based on the position change of the interlocking mechanism.

[0046] It is understandable that there are multiple ways for the interlocking mechanism to block or lock the bypass control switch QF30. For example, the interlocking mechanism can cover the bypass control switch QF30 in a protective cover-like manner to block or lock it. Alternatively, the interlocking mechanism can limit the closing action of the bypass control switch QF30 to lock it. Both of these methods can meet the needs of this application. For ease of understanding, the following will take the example of the interlocking mechanism covering the bypass control switch QF30, and will explain in detail the two triggering methods of the controller by the interlocking mechanism.

[0047] In this embodiment, as Figures 2 to 4 As shown, the interlocking mechanism includes a structural component 501 that covers or locks the bypass control switch QF30; the structural component 501 is physically connected to the controller; for example, while the structural component 501 is fixedly installed in the distribution cabinet 5 and covers the bypass control switch QF30, it can also keep the trigger switch on the controller pressed. When the bypass power supply mode needs to be executed, the structural component 501 can be disassembled first. During the process of disassembling and removing the structural component 501 to release the coverage of the bypass control switch QF30, the structural component 501 will release the press of the trigger switch on the controller due to the change in position, that is, the change in the stroke relative to the trigger switch. Thus, the controller will be triggered to control the inverter group to lock phase, and at the same time control the first control switch to the third control switch to disconnect.

[0048] In this embodiment, as Figures 2 to 4As shown, the interlocking mechanism includes a structural component 501 and a micro switch 502. The structural component 501 is used to cover or lock the bypass control switch QF30. The micro switch 502 is physically connected to the structural component 501 and electrically connected to the controller. For example, while the structural component 501 is fixedly installed in the distribution cabinet 5 to cover the bypass control switch QF30, it can also keep the micro switch 502 pressed. When the bypass power supply mode needs to be executed, the structural component 501 can be disassembled first. During the process of disassembling and removing the structural component 501 to release the cover of the bypass control switch QF30, the micro switch 502 is triggered from normally closed to normally open based on the position change of the structural component 501. Then, the controller is triggered by the drive signal generated by the state change of the micro switch 502.

[0049] Another aspect of this application provides a control method for the above-described bypass architecture, such as... Figure 5 As shown, one preferred embodiment includes the following steps: When the load power supply system is operating normally, the bypass control switch QF30 located in the distribution cabinet 5 remains open and is blocked or locked by an interlocking mechanism. When the load power supply system requires maintenance of the inverter group, the interlocking mechanism is first operated to release the blocking or locking of the bypass control switch QF30; based on the state change of the interlocking mechanism, the controller located in the distribution cabinet 5 is triggered in advance to control the inverter group to perform phase-locking; then the bypass control switch QF30 is operated to close to force the first control switch to close; after the first control switch is closed, the controller can control the second control switch to open, thereby executing the bypass power supply mode of supplying power to the critical load 300 through the power grid 100.

[0050] Understandably, after completing the inverter group maintenance, the load power supply system needs to exit bypass power supply mode to execute normal operating mode, thereby reducing the power supply cost of the critical load 300. For ease of understanding, the specific process of exiting bypass power supply mode and switching to normal operating mode will be described in detail below.

[0051] Specifically, such as Figure 6As shown, the process of switching the load power supply system back to normal operation after the inverter group completes maintenance is as follows: First, the controller located in distribution cabinet 5 is powered on. After the controller is powered on, it can perform a self-test on the inverter group to check whether the inverter group has completed maintenance. If the inverter group self-test fails, the grid 100 continues to maintain the bypass power supply mode to supply power to the critical load 300; otherwise, the controller checks whether it has received the inverter group's start-up command. If the controller does not receive the inverter group's start-up command, the grid 100 continues to maintain the bypass power supply mode to supply power to the critical load 300. If the controller receives the inverter group's start-up command, it sends a closing command to the first control switch after receiving the start-up command; at the same time, it starts the inverter group to operate normally and keeps the output voltage of the inverter group synchronized with the grid voltage. When the grid voltage is synchronized with the output voltage of the inverter group, the inverter group can prompt the second control switch to be closed again. Then, the bypass control switch QF30 is manually operated to disconnect and re-block or lock through the interlocking mechanism to exit the bypass power supply mode, thereby completing the switching process from bypass power supply to normal power supply.

[0052] It is important to note that when operating in bypass power supply mode, if a generator 200 is installed in the load power supply system, the controller can simultaneously open the second control switch and the third control switch. Similarly, when switching from bypass power supply mode to normal operating mode, if a generator 200 is installed in the load power supply system, the controller can simultaneously close the second control switch and the third control switch.

[0053] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A bypass architecture applied to a load power supply system, characterized in that, include: First control switch; The power grid is connected to the critical load via the first control switch; Second control switch; The inverter assembly is connected to the critical load via the second control switch; Bypass control switch; The bypass control switch is installed inside the distribution cabinet and is not connected to a critical load. The bypass control switch is manually closed to force the first control switch to remain closed. An interlocking mechanism, which is installed in the distribution cabinet and cooperates with the bypass control switch, is adapted to respond in advance when the bypass control switch is operated; as well as The controller, based on the response of the interlocking mechanism, first controls the inverter group to perform phase-locked control, and triggers the disconnection control of the second control switch after the first control switch is closed.

2. The bypass architecture as described in claim 1, characterized in that, The interlocking mechanism blocks or locks the bypass control switch so that when bypassing the inverter group, the interlocking mechanism is first driven to release the blockage or lock on the bypass control switch, at which point the controller is triggered based on the position change of the interlocking mechanism.

3. The bypass architecture as described in claim 2, characterized in that, The interlocking mechanism includes a structural component that blocks or locks the bypass control switch, and the structural component is physically connected to the controller. When bypassing the inverter assembly, the controller is triggered based on the position change of the structural member during the process of removing the structural member to prepare for operation of the bypass control switch.

4. The bypass architecture as described in claim 2, characterized in that, The interlocking mechanism includes a structural component and a micro switch. The structural component is used to block or lock the bypass control switch. The micro switch is physically connected to the structural component and electrically connected to the controller. When the inverter group is bypassed, during the process of removing the structural component to prepare for operation of the bypass control switch, the micro switch is triggered to change state based on the position change of the structural component, and then the controller is triggered according to the drive signal generated by the micro switch state change.

5. The bypass architecture as described in claim 1, characterized in that, The first control switch is a circuit breaker or a contactor.

6. The bypass architecture as described in claim 1, characterized in that, The first control switch includes a circuit breaker and a contactor connected in series; the bypass control switch forces the contactor to remain engaged.

7. The bypass architecture as described in claim 1, characterized in that, The inverter group includes a grid-connected inverter and at least one energy storage inverter; The second control switch includes a first output switch and a second output switch respectively disposed at the output terminals of the grid-connected inverter and the energy storage inverter; For multiple energy storage inverters, the second control switch further includes a centralized control switch, and the multiple energy storage inverters are connected in parallel to the centralized control switch through corresponding second output switches, so that the energy storage inverters are connected to critical loads through the centralized control switch.

8. The bypass architecture as described in claim 1, characterized in that, In addition to the power grid and inverter group, the load power supply system is equipped with at least one other power source; The bypass architecture also includes at least one third control switch, through which each other power supply is connected to the critical load; The third control switch is connected to the controller so that when the controller is triggered in advance, the third control switch disconnects the connection between other power supplies and critical loads.

9. A control method for a bypass architecture as described in any one of claims 1-8, characterized in that, Includes the following steps: When the load power supply system is working normally, the bypass control switch located in the distribution cabinet remains open and is blocked or locked by an interlocking mechanism. When the inverter group needs maintenance in the load power supply system, first operate the interlocking mechanism to release the obstruction or lock of the bypass control switch; Based on the state changes of the interlocking mechanism, the controller set in the distribution cabinet controls the inverter group to perform phase-locking to synchronize the output voltage with the grid voltage during this process; Then, the bypass control switch is operated to force the first control switch to close. After the first control switch is closed, the second control switch is opened to execute the bypass power supply mode that supplies power to the critical load through the power grid.

10. The control method for the bypass architecture as described in claim 9, characterized in that, The process of switching the load power supply system back to normal operation after the inverter group has completed maintenance is as follows: The controller performs a self-test on the inverter group. If the inverter group fails the self-test, the grid continues to maintain the bypass power supply mode to supply power to the critical load. Otherwise, after receiving the start command, the controller sends a closing command to the first control switch. At the same time, the inverter group is started to work normally and its output voltage is kept synchronized with the grid voltage. Once the grid voltage is synchronized with the inverter output voltage, the inverter will prompt the second control switch to be closed again. Then, operate the bypass control switch to disconnect and re-block or lock it through the interlocking mechanism to exit the bypass power supply mode; The switching process is completed after the controller detects that the bypass power supply mode has been exited.

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