Power supply and distribution system

Abstract

The utility model provides a power supply and distribution system. The power supply and distribution system comprises a first bus, a second bus, a controller and an uninterruptible power supply. The first bus is connected to a power grid and the second bus is connected to a load. The uninterruptible power supply comprises a main circuit, a bypass circuit and a maintenance bypass circuit. The main circuit is connected to the first bus through the main switch and connected to the second bus through the output switch. The bypass circuit is connected to the first bus through the bypass switch and connected to the second bus through the output switch. The maintenance bypass circuit is connected to the first bus and the second bus through the maintenance bypass switch. The service bypass switch switches the transmitted signal prior to conduction. The controller can control the uninterruptible power supply to be switched from the main circuit to the bypass circuit to access the circuit of the first bus and the circuit of the second bus before the maintenance bypass switch is conducted according to the signals before and after switching, so that when the uninterruptible power supply is maintained, the voltage impact of the mains supply of a power grid on an inverter of the uninterruptible power supply is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of power equipment, and particularly to a power supply and distribution system. Background Art

[0002] An uninterruptible power supply (UPS) is an uninterruptible power supply containing an energy storage device, mainly used to provide uninterrupted power to devices with high requirements for power stability. When the mains input is normal, the UPS stabilizes the mains power and supplies it to the load. At this time, the UPS can be regarded as an AC voltage stabilizer, and it also charges the battery; when the mains power is interrupted or cut off, the UPS immediately supplies the DC electrical energy stored in the battery to the load through the inverter, so that the load can maintain normal operation and protect the load from damage. In addition, the UPS is also provided with a bypass unit, which has two groups of bidirectional silicon-controlled rectifier (SCR) devices inside. By controlling the inverter to standby and conducting the SCR, the UPS can switch from the inverter to the bypass unit and directly supply the mains power to the load.

[0003] A power supply and distribution system usually includes multiple uninterruptible power supplies connected in parallel. In this power supply and distribution system, it is usually necessary to use switches such as circuit breakers or fuses to achieve power distribution. Taking the circuit breaker as an example, in addition to playing the role of controlling the on and off of the circuit, the circuit breaker also has a certain protection function. Specifically, a mechanical switch can be set in the circuit breaker, and the operator can operate the mechanical switch to switch the on or off state of the circuit breaker, thereby achieving the conduction or disconnection of the circuit.

[0004] However, at the moment when the circuit breaker trips or closes, the total voltage of the power supply and distribution system will change instantaneously, which is likely to cause overshoot to the inverters and loads in the system, and is not conducive to the voltage output stability of the system. Summary of the Utility Model

[0005] The present application provides a power supply and distribution system and its control method to switch the circuit of the uninterruptible power supply in advance before the switch conducts or disconnects, so as to avoid the phenomenon of voltage overshoot to the inverter of the uninterruptible power supply.

[0006] In a first aspect, the present application provides a power supply and distribution system. The power supply and distribution system includes a first bus, a second bus, a controller, and an uninterruptible power supply. Specifically, the first bus is electrically connected to the power grid, and the second bus is electrically connected to the load. The uninterruptible power supply includes a main circuit, a bypass circuit, and an output switch. Among them, the main circuit and the bypass circuit are respectively connected to the first bus. After the main circuit and the bypass circuit are connected in parallel, they are connected in series with the output switch, and the output switch is connected to the second bus. The main circuit includes a main switch and an inverter connected in series. Among them, the main switch is connected to the first bus, and the inverter is connected to the output switch. The bypass circuit includes a bypass switch. One end of the bypass switch is connected to the first bus, and the other end is connected to the second bus. The uninterruptible power supply further includes a maintenance bypass circuit, and the maintenance bypass circuit includes a maintenance bypass switch. One end of the maintenance bypass switch is connected to the first bus, and the other end is connected to the second bus. The above-mentioned main switch and output switch are used to conduct and disconnect the main circuit, the bypass switch and the output switch are used to conduct and disconnect the bypass circuit, and the maintenance bypass switch is used to conduct and disconnect the maintenance bypass circuit. Moreover, the output switch, the main switch, the bypass switch, and the maintenance bypass switch are respectively electrically connected to the controller. The controller is used to control the conduction or disconnection of the output switch, the main switch, the bypass switch, and the maintenance bypass switch, so as to control only one of the main circuit and the bypass circuit to be connected to the first bus and the second bus and form a loop, or control the bypass circuit and the maintenance bypass circuit to be connected in parallel to the first bus and the second bus and form a loop. When the main circuit is connected to the first bus and the second bus and the maintenance bypass switch is disconnected, during the process of the maintenance bypass switch switching from the off state to the on state, the maintenance bypass switch is used to switch from sending a first signal to the controller to sending a second signal to the controller before conduction, and the first signal is different from the second signal. The controller is used to control the uninterruptible power supply corresponding to the maintenance bypass switch to switch from the main circuit to the bypass circuit before the maintenance bypass switch is conducted when the first signal is switched to the second signal.

[0007] In the power supply and distribution system of the present application, the main circuit and the bypass circuit of the uninterruptible power supply are connected in parallel and then connected to the second bus through the output switch to form a power supply circuit. The maintenance bypass circuit is connected in parallel with the power supply circuit. By controlling the conduction or disconnection of each switch, different circuits can be connected to the first bus and the second bus. In the scenario of fault repair, the uninterruptible power supply needs to enable the maintenance bypass circuit and switch the main circuit to the bypass circuit. Before enabling the maintenance bypass circuit, only the main circuit is connected to the first bus and the second bus. Enabling the maintenance bypass circuit is achieved by conducting the maintenance bypass switch. During the closing process of the maintenance bypass switch, the signal that the maintenance bypass switch can send to the controller can be switched from the first signal to the second signal. When the first signal is switched to the second signal, the controller can control the main circuit to switch to the bypass circuit before the maintenance bypass switch is conducted, so as to avoid voltage impact on the inverter of the main circuit by the commercial power of the power grid at the moment when the maintenance bypass circuit is conducted.

[0008] In a power supply and distribution system, when the main circuit is disconnected from the first bus and the second bus, it can be achieved by controlling the inverter to switch to the working state and / or controlling the main circuit switch to disconnect. In a possible implementation, the uninterruptible power supply switches from the main circuit to the bypass circuit, specifically including: the controller controls the inverter to switch to the standby state before the maintenance bypass switch is turned on, and controls the bypass switch to turn on before the maintenance bypass switch is turned on. In this way, by controlling the working state of the inverter, the controller can disconnect the main circuit from the first bus and the second bus without disconnecting the main circuit switch, which is convenient for control.

[0009] In the above power supply and distribution system, the bypass switch can be only a single switching device, or can also include multiple devices. In a possible implementation, the bypass switch includes a circuit breaker and a switching transistor. When the bypass circuit is disconnected, at least one of the circuit breaker and the switching transistor is in the disconnected state. In the case where only one of the circuit breaker and the switching transistor is in the disconnected state, during the process of the bypass switch switching from the disconnected state to the conducting state, the controller controls the circuit breaker or the switching transistor to turn on before the maintenance bypass switch is turned on. Or, in the case where both the circuit breaker and the switching transistor are in the disconnected state, during the process of the bypass switch switching from the disconnected state to the conducting state, the controller controls the circuit breaker and the switching transistor to turn on respectively before the maintenance bypass switch is turned on. In another possible implementation, the bypass switch is a circuit breaker. When the bypass circuit is disconnected, the circuit breaker is in the disconnected state. During the process of the circuit breaker switching from the disconnected state to the conducting state, the controller controls the circuit breaker to turn on before the maintenance bypass switch is turned on. Of course, in other implementations, the bypass switch can include a disconnecting switch and a fuse, or the bypass switch can include a disconnecting switch, a fuse and a switching transistor.

[0010] In the parallel operation mode, when it is necessary to increase or decrease the uninterruptible power supplies connected to the first bus and the second bus in the power supply and distribution system, it can be achieved by controlling the main circuit switch to turn on or off. Before turning on or off the main circuit switch, the signal sent to the controller can be switched. During the process of turning on or off the switch, the controller can control the inverters of other uninterruptible power supplies to adjust the output voltage according to the received signal, so that when the uninterruptible power supplies are increased or decreased in the power supply and distribution system, the voltage output from the second bus to the load remains stable, thereby maintaining the output voltage stability of the power supply and distribution system to avoid voltage overshoot or undershoot phenomena for the uninterruptible power supplies and the load.

[0011] In a possible scenario, uninterruptible power supplies (UPSs) connected to the first busbar and the second busbar in the power supply and distribution system can be increased. Specifically, the power supply and distribution system may include m UPSs and n UPSs, where m and n are positive integers greater than or equal to 1 respectively. The main circuits of the above m UPSs have been connected to the first busbar and the second busbar respectively, and the main circuits of the above n UPSs are not connected to the first busbar and the second busbar. In a possible implementation, in at least one of the above n UPSs, one of the main switch and the output switch is in the conducting state and the other is in the off state. During the process of connecting the main circuit of the aforementioned at least one UPS to the first busbar and the second busbar, when the main switch or the output switch switches from the off state to the conducting state, the main switch or the output switch is used to switch from sending a third signal to the controller to sending a fourth signal to the controller before conduction, and the third signal is different from the fourth signal. The controller is used to control the output voltage of the inverters of the above m UPSs to decrease when the third signal switches to the fourth signal, so that after the main circuit of at least one UPS is connected to the first busbar and the second busbar, the voltage output by the above m UPSs to the second busbar remains stable to prevent the voltage supplied to the load from being too high. Or, in another possible implementation, in at least one of the above n UPSs, the main switch and the output switch are in the off state. During the process of connecting the main circuit of the aforementioned at least one UPS to the first busbar and the second busbar, when the main switch and the output switch switch from the off state to the conducting state, at least one of the main switch and the output switch is used to switch from sending a third signal to the controller to sending a fourth signal to the controller before conduction. The controller is used to control the output voltage of the inverters of the above m UPSs to decrease when the third signal switches to the fourth signal, so that after the main circuit of at least one UPS is connected to the first busbar and the second busbar, the voltage output by the above m UPSs to the second busbar remains stable to prevent the voltage supplied to the load from being too high.

[0012] In the above implementation manner, the switch for sending the third signal and the fourth signal to the controller may be a first circuit breaker. The first circuit breaker includes a housing, an operating handle, a moving contact assembly, a static contact, and a first micro switch. Specifically, the operating handle, the moving contact assembly, the static contact, and the first micro switch are located inside the housing, and the operating handle extends out of the housing. The moving contact assembly includes a main shaft and a rotating rod. The main shaft and the rotating rod are respectively rotatably connected to the housing. The operating handle is drivingly connected to the main shaft. One end of the rotating rod is arranged close to the main shaft, and the other end extends in a direction away from the operating handle and is provided with a moving contact, and the moving contact is used for contacting or separating from the static contact. The operating handle is used to drive the main shaft to rotate. The main shaft is provided with a boss, and the boss is used to drive the rotating rod to rotate so that the moving contact separates from the static contact. The main shaft is further provided with a lever, and the lever is used to conduct or disconnect the first micro switch. When the first circuit breaker is in the open state, the moving contact separates from the static contact, the boss contacts the rotating rod, and the lever presses the first micro switch so that the first micro switch is conducted and sends the third signal to the controller. When the first circuit breaker switches from the open state to the closed state, the operating handle drives the main shaft to rotate, so that the lever moves in a direction away from the first micro switch, and the rotating rod rotates towards the static contact, so that before the moving contact contacts the static contact, the first micro switch is disconnected and sends the fourth signal. When the first circuit breaker is in the closed state, the moving contact contacts the static contact, and the first micro switch is used to send the fourth signal to the controller. In this technical solution, during the rotation of the main shaft, the lever gradually moves away from the first micro switch, and at the same time the moving contact moves towards the static contact. Before the moving contact contacts the static contact, the first micro switch is disconnected and the signal sent to the controller can be switched. The main shaft continues to rotate, the moving contact contacts the static contact, and the first circuit breaker is closed. That is to say, the first micro switch is disconnected before the moving contact contacts the static contact, and the controller can receive different signals of the first circuit breaker, so that the output voltage of the uninterruptible power supply connected to the first bus and the second bus can be adjusted according to the change of the signal to ensure the stability of the output voltage and improve the voltage overshoot phenomenon of the inverter.

[0013] In another possible scenario, the uninterruptible power supplies connected to the first busbar and the second busbar in the power supply and distribution system can be reduced. Specifically, the power supply and distribution system may include N uninterruptible power supplies, where N is a positive integer greater than 1. The main circuits of the foregoing N uninterruptible power supplies are respectively connected to the first busbar and the second busbar. In a possible implementation manner, during the process of disconnecting the main circuits of M uninterruptible power supplies among the foregoing N uninterruptible power supplies from the first busbar and the second busbar, one of the main switches and output switches of the foregoing M uninterruptible power supplies is first disconnected, and this one is used to switch from sending a fourth signal to the controller to sending a third signal to the controller before disconnection. The third signal is different from the fourth signal. M is a positive integer greater than or equal to 1 and less than N. The controller is used to control the output voltage of the inverters of the remaining uninterruptible power supplies among the N uninterruptible power supplies to increase when the fourth signal is switched to the third signal, so that after the main circuits of the M uninterruptible power supplies are disconnected from the first busbar and the second busbar, the voltage output by the remaining uninterruptible power supplies to the second busbar remains stable to prevent the voltage supplied to the load from being too low. Alternatively, in another possible implementation manner, during the process of disconnecting the main circuits of M uninterruptible power supplies among the foregoing N uninterruptible power supplies from the first busbar and the second busbar, the main switches and output switches of the foregoing M uninterruptible power supplies are disconnected simultaneously, and the main switches and output switches are switched from sending a fourth signal to the controller to sending a third signal to the controller before disconnection. The third signal is different from the fourth signal. The foregoing M is a positive integer greater than or equal to 1 and less than N. The controller is used to control the output voltage of the inverters of the remaining uninterruptible power supplies among the foregoing N uninterruptible power supplies to increase when the fourth signal is switched to the third signal, so that after the main circuits of the foregoing M uninterruptible power supplies are disconnected from the first busbar and the second busbar, the voltage output by the remaining uninterruptible power supplies to the second busbar remains stable to prevent the voltage supplied to the load from being too low.

[0014] In the above implementation manner, the switch for sending the third signal and the fourth signal to the controller is the second circuit breaker. The second circuit breaker includes a housing, an operating handle, a moving contact assembly, a static contact, and a second micro switch. Specifically, the operating handle, the moving contact assembly, the static contact, and the second micro switch are located inside the housing, and the operating handle extends out of the housing. The moving contact assembly includes a main shaft and a rotating rod. The main shaft and the rotating rod are respectively rotatably connected to the housing. The operating handle is in transmission connection with the main shaft. One end of the rotating rod is arranged close to the main shaft, and the other end extends in a direction away from the operating handle and is provided with a moving contact, and the moving contact is used for contacting or separating from the static contact. The operating handle is used to drive the main shaft to rotate. The main shaft is provided with a convex platform, and the convex platform is used to drive the rotating rod to rotate so that the moving contact is separated from the static contact. The main shaft is also provided with a lever, and the lever is used to conduct or disconnect the second micro switch. When the second circuit breaker is in the closed state, the moving contact contacts the static contact, the convex platform is spaced from the rotating rod by a set distance, and the lever presses the second micro switch so that the second micro switch is conducted and used to send the fourth signal to the controller. When the second circuit breaker is switched from the closed state to the open state, the operating handle drives the main shaft to rotate, so that the lever moves in a direction away from the second micro switch, and the convex platform moves towards the rotating rod, so that before the convex platform contacts the rotating rod, the second micro switch is disconnected and sends the third signal. When the second circuit breaker is in the open state, the moving contact is separated from the static contact, and the second micro switch is used to send the third signal to the controller. In this technical solution, during the rotation of the main shaft, the lever gradually moves away from the second micro switch along with the main shaft, and at the same time, the convex platform moves towards the rotating rod along with the main shaft. Before the convex platform contacts the rotating rod, the first micro switch is disconnected and the signal sent to the controller can be switched. The main shaft continues to rotate, the convex platform contacts the rotating rod and starts to push the rotating rod to rotate, thereby driving the moving contact to be separated from the static contact, so that the second circuit breaker is opened. That is to say, the second micro switch is disconnected before the moving contact is separated from the static contact, and the controller can receive different signals of the second circuit breaker, so that the output voltage of the uninterruptible power supply connected to the first bus and the second bus can be adjusted according to the change of the signal to ensure the stability of the output voltage and improve the voltage overshoot phenomenon of the inverter.

[0015] In the present application, the maintenance bypass switch may be a third circuit breaker. The third circuit breaker includes a housing, an operating handle, a moving contact assembly, a static contact, and a third microswitch. Specifically, the operating handle, the moving contact assembly, the static contact, and the third microswitch are located inside the housing, and the operating handle extends out of the housing. The moving contact assembly includes a main shaft and a rotating rod. The main shaft and the rotating rod are respectively rotatably connected to the housing. The operating handle is in transmission connection with the main shaft. One end of the rotating rod is arranged close to the main shaft, and the other end extends in a direction away from the operating handle and is provided with a moving contact for contacting or separating from the static contact. The operating handle is used to drive the main shaft to rotate. The main shaft is provided with a boss for driving the rotating rod to rotate so that the moving contact separates from the static contact. The main shaft is also provided with a lever for turning on or off the third microswitch. When the third circuit breaker is in the open state, the moving contact separates from the static contact, the boss contacts the rotating rod, and the lever presses the third microswitch to turn on the third microswitch and send a first signal to the controller. When the third circuit breaker switches from the open state to the closed state, the operating handle drives the main shaft to rotate, causing the lever to move in a direction away from the third microswitch and causing the rotating rod to rotate towards the static contact. Before the moving contact contacts the static contact, the third microswitch disconnects and sends a second signal. When the third circuit breaker is in the closed state, the moving contact contacts the static contact, and the third microswitch is used to send a first signal to the controller. In this technical solution, during the rotation of the main shaft, the lever gradually moves away from the third microswitch, and at the same time, the moving contact moves towards the static contact. Before the moving contact contacts the static contact, the third microswitch disconnects and can switch the signal sent to the controller. The main shaft continues to rotate, and the moving contact contacts the static contact, closing the third circuit breaker. That is to say, the third microswitch disconnects before the moving contact contacts the static contact, and the controller can receive different signals of the third circuit breaker, so that the output voltage of the uninterruptible power supply connected to the first bus and the second bus can be adjusted according to the change of the signal to ensure the stability of the output voltage and improve the voltage overshoot phenomenon of the inverter.

[0016] In the present application, the main circuit switch, the output switch, and the maintenance bypass switch may be other types of switches in addition to circuit breakers. For example, the main circuit switch may be a circuit breaker, or the main circuit switch may also include a disconnecting switch and a fuse. The output switch may be a circuit breaker, or the output switch may also include a disconnecting switch and a fuse. The maintenance bypass switch may be a circuit breaker, or the maintenance bypass switch may also include a disconnecting switch and a fuse.

[0017] Second aspect, the present application also provides a power supply and distribution system. The power supply and distribution system includes a first bus, a second bus, a controller, and a plurality of uninterruptible power supplies. Specifically, the first bus is electrically connected to the power grid, and the second bus is electrically connected to the load. Among the plurality of uninterruptible power supplies, each uninterruptible power supply includes a main circuit, a bypass circuit, and an output switch. Wherein, the main circuit and the bypass circuit are respectively connected to the first bus, the main circuit and the bypass circuit are connected in parallel and then connected in series with the output switch, and the output switch is connected to the second bus. The main circuit includes a main switch and an inverter connected in series. Wherein, the main switch is connected to the first bus, and the inverter is connected to the output switch. The bypass circuit includes a bypass switch, one end of the bypass switch is connected to the first bus, and the other end is connected to the output switch. The main switch and the output switch are used to conduct and disconnect the main circuit, and the bypass switch and the output switch are used to conduct and disconnect the bypass circuit. The output switch, the main switch, and the bypass switch are respectively electrically connected to the controller. The controller is configured to control only one of the main circuit and the bypass circuit to be connected to the first bus and the second bus and form a loop by controlling the conduction or disconnection of the output switch, the main switch, and the bypass switch. During the process of the output switch switching from the off state to the on state, the output switch is configured to switch from sending a third signal to the controller to sending a fourth signal to the controller before conduction, and the third signal is different from the fourth signal. During the process of the output switch switching from the on state to the off state, the output switch is configured to switch from sending a fourth signal to the controller to sending a third signal to the controller before disconnection. The controller is configured to control the inverters of the plurality of uninterruptible power supplies to adjust the output voltage before the output switch is conducted or disconnected when the third signal is switched to the fourth signal, or when the fourth signal is switched to the third signal, so as to keep the voltage output by the plurality of uninterruptible power supplies to the second bus stable.

[0018] In the power supply and distribution system of the present application, the main circuit and the bypass circuit of the uninterruptible power supply are connected in parallel and then connected to the second bus through the output switch to form a power supply circuit. In the parallel operation mode, when it is necessary to increase or decrease the uninterruptible power supplies connected to the first bus and the second bus in the power supply and distribution system, it can be achieved by controlling the conduction or disconnection of the switch of the main circuit. Before the switch of the main circuit is conducted or disconnected, the signal sent to the controller can be switched. During the process of conducting or disconnecting the switch, the controller can control the inverters of other uninterruptible power supplies to adjust the output voltage according to the received signal, so that the voltage output by the second bus to the load remains stable at the moment when the uninterruptible power supplies are increased or decreased in the power supply and distribution system, thereby maintaining the output voltage stability of the power supply and distribution system and avoiding voltage overshoot or undershoot phenomena on the uninterruptible power supplies and the load.

[0019] In a possible scenario, uninterruptible power supplies (UPSs) connected to the first busbar and the second busbar in the power supply and distribution system can be increased. Specifically, the power supply and distribution system includes m UPSs and n UPSs, where m and n are positive integers greater than or equal to 1. The main circuits of the aforementioned m UPSs have been connected to the first busbar and the second busbar respectively, and the main circuits of the aforementioned n UPSs are not connected to the first busbar and the second busbar. In a possible implementation, in at least one of the aforementioned n UPSs, the main switch is in the on state and the output switch is in the off state. During the process of connecting the main circuits of at least one UPS to the first busbar and the second busbar, during the process of the output switch switching from the off state to the on state, the output switch is used to switch from sending a third signal to the controller to sending a fourth signal to the controller before turning on. The controller is used to control the output voltage of the inverters of the aforementioned m UPSs to decrease when the third signal switches to the fourth signal, so that after the main circuits of at least one UPS are connected to the first busbar and the second busbar, the voltage output by the aforementioned m UPSs to the second busbar remains stable to prevent the voltage supplied to the load from being too high. Alternatively, in another possible implementation, in at least one of the aforementioned n UPSs, the main switch and the output switch are in the off state; during the process of connecting the main circuits of at least one UPS to the first busbar and the second busbar, during the process of the main switch and the output switch simultaneously switching from the off state to the on state, the output switch is used to switch from sending a third signal to the controller to sending a fourth signal to the controller before turning on. The controller is used to control the output voltage of the inverters of the aforementioned m UPSs to decrease when the third signal switches to the fourth signal, so that after the main circuits of at least one UPS are connected to the first busbar and the second busbar, the voltage output by the aforementioned m UPSs to the second busbar remains stable to prevent the voltage supplied to the load from being too high.

[0020] In another possible scenario, the uninterruptible power supplies connected to the first bus and the second bus in the power supply and distribution system can be reduced. Specifically, the power supply and distribution system includes N uninterruptible power supplies, where N is a positive integer greater than 1; the main circuits of the N uninterruptible power supplies are respectively connected to the first bus and the second bus. During the process of disconnecting the main circuits of M uninterruptible power supplies among the aforementioned N uninterruptible power supplies from the first bus and the second bus, the output switches of the aforementioned M uninterruptible power supplies are first disconnected, and the output switches are used to switch from sending a fourth signal to the controller to sending a third signal to the controller before disconnection. M is a positive integer greater than or equal to 1 and less than N. The controller is used to control the output voltage of the inverters of the remaining uninterruptible power supplies among the aforementioned N uninterruptible power supplies to increase when the fourth signal is switched to the third signal, so that after the main circuits of the aforementioned M uninterruptible power supplies are disconnected from the first bus and the second bus, the voltage output by the remaining uninterruptible power supplies to the second bus remains stable, preventing the voltage supplied to the load from being too low. Or, in another possible implementation, during the process of disconnecting the main circuits of M uninterruptible power supplies among the aforementioned N uninterruptible power supplies from the first bus and the second bus, the main switches and the output switches of the aforementioned M uninterruptible power supplies are disconnected simultaneously, and the main switches and the output switches switch from sending a fourth signal to the controller to sending a third signal to the controller before disconnection. M is a positive integer greater than or equal to 1 and less than N. The controller is used to control the output voltage of the inverters of the remaining uninterruptible power supplies among the aforementioned N uninterruptible power supplies to increase when the fourth signal is switched to the third signal, so that after the main circuits of the aforementioned M uninterruptible power supplies are disconnected from the first bus and the second bus, the voltage output by the remaining uninterruptible power supplies to the second bus remains stable, preventing the voltage supplied to the load from being too low. Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the power supply and distribution system provided by an embodiment of the present application;

[0022] Figure 2 It is a schematic diagram of an uninterruptible power supply provided by an embodiment of the present application;

[0023] Figure 3 It is a schematic diagram of an uninterruptible power supply provided by an embodiment of the present application;

[0024] Figure 4 It is another schematic diagram of an uninterruptible power supply provided by an embodiment of the present application;

[0025] Figure 5 It is a schematic diagram of a circuit breaker provided by an embodiment of the present application;

[0026] Figure 6 is Figure 5 A schematic diagram of the circuit breaker along the A-A direction;

[0027] Figure 7 is Figure 5 a cross-sectional view of the circuit breaker along the A-A direction;

[0028] Figure 8 a schematic diagram of the main shaft provided by an embodiment of the present application;

[0029] Figure 9 another schematic diagram of the main shaft provided by an embodiment of the present application;

[0030] Figure 10 a schematic diagram of the moving contact assembly provided by an embodiment of the present application;

[0031] Figure 11 another schematic diagram of the moving contact assembly provided by an embodiment of the present application;

[0032] Figure 12 is Figure 7 a partial enlarged view within the dashed box in;

[0033] Figure 13 a travel and level schematic diagram of the first microswitch provided by an embodiment of the present application;

[0034] Figure 14 is Figure 5 another cross-sectional view of the circuit breaker along the A-A direction;

[0035] Figure 15 is Figure 14 a partial enlarged view within the dashed box in;

[0036] Figure 16 a travel and level schematic diagram of the second microswitch provided by an embodiment of the present application.

[0037] Reference numerals:

[0038] 10 - Power supply and distribution system

[0039] 11 - First busbar

[0040] 12 - Second busbar

[0041] 13 - Uninterruptible power supply

[0042] 30 - Circuit breaker

[0043] 31 - Housing

[0044] 32 - Operating handle

[0045] 33 - Operating mechanism

[0046] 34 - Current-carrying component

[0047] 35 - Arc extinguishing chamber

[0048] 36 - First microswitch

[0049] 37 - Second microswitch

[0050] 38 - Baffle

[0051] 130 - User operation surface

[0052] 131 - Cabinet

[0053] 132 - Rectifier

[0054] 133 - Inverter

[0055] 134 - Charging circuit

[0056] 135 - Battery

[0057] 136 - Switch transistor

[0058] 310 - Circuit breaker operation surface

[0059] 341 - Moving contact assembly

[0060] 342 - Stationary contact

[0061] 361 - First fixing plate

[0062] 362 - First moving contact

[0063] 363 - First stationary contact

[0064] 364 - First spring

[0065] 371 - Second fixing plate

[0066] 372 - Second moving contact

[0067] 373 - Second stationary contact

[0068] 374 - Second spring

[0069] 381 - Opening

[0070] 3411 - Moving contact

[0071] 3412 - Spindle

[0072] 3413 - Rotating rod

[0073] 3414 - Third spring

[0074] 3611 - First limiting rib

[0075] 3711 - Second limiting rib

[0076] 34121 - Boss

[0077] 34122 - Poking rod Detailed implementation manners

[0078] To make the objectives, technical solutions, and advantages of this application clearer, the following will further describe this application in detail with reference to the accompanying drawings.

[0079] To facilitate the understanding of the circuit breaker and power equipment provided in the embodiments of this application, the following describes its application scenarios. The circuit breaker and power equipment provided in the embodiments of this application can be widely applied in various power supply and distribution systems. In an example provided in this application, the circuit breaker can be applied in the power supply and distribution system of a data center to connect, carry, and disconnect the current between the power grid and the data center. Figure 1 This is a schematic diagram of the power supply and distribution system provided in the embodiments of this application. As Figure 1 shown, the power supply and distribution system 10 may include a first bus 11, a second bus 12, a controller (not shown in the figure), and at least one uninterruptible power supply 13. When the power supply and distribution system 10 includes multiple uninterruptible power supplies 13, these uninterruptible power supplies 13 are connected in parallel and then connected to the first bus 11 and the second bus 12. Specifically, the first bus 11 is connected to the power grid, the second bus 12 is connected to the load, and the multiple uninterruptible power supplies 13 are used to stabilize the commercial power input from the power grid and then output it to the load, and at the same time charge the battery in the uninterruptible power supply 13.

[0080] Figure 2 This is a schematic diagram of the uninterruptible power supply provided in the embodiments of this application. As Figure 2 shown, the uninterruptible power supply 13 includes a cabinet 131, as well as a power supply, a controller, multiple power modules (Q1,..., Qn), and multiple circuit breakers (K1,..., Km) located inside the cabinet 131. Among them, the side of the cabinet 131 facing the staff is the user operation surface 130. In this application, taking the state where the cabinet 131 is placed on the ground as an example, the dimension parallel to the ground of the user operation surface 130 is the width, the dimension perpendicular to the ground of the user operation surface 130 is the height, and the dimension perpendicular to the user operation surface 130 of the cabinet 131 is the depth. The aforementioned multiple power modules are stacked in sequence along the height direction H of the cabinet 131, and the aforementioned multiple circuit breakers are placed in sequence along the width direction W of the cabinet 131 on one side of the multiple power modules. Among them, the power module is used to perform power conversion on the voltage from the power grid to output an adapted voltage to the load device. Specifically, the power module may be an AC / AC module or an AC / DC module. The power supply is used to supply power to the multiple power modules. The multiple power modules and the multiple circuit breakers are arranged in one-to-one correspondence and electrically connected. The power supply and the multiple circuit breakers are respectively electrically connected to the controller.

[0081] Figure 3 This is a schematic diagram of the uninterruptible power supply provided in the embodiments of this application, Figure 4 This is another schematic diagram of the uninterruptible power supply provided in the embodiments of this application. AsFigure 3 and Figure 4 As shown in Figure 4 , the uninterruptible power supply 13 includes a main circuit C1, a bypass circuit C2, and a maintenance bypass circuit C3. The main circuit C1 and the bypass circuit C2 are respectively connected to the first bus 11. After the main circuit C1 and the bypass circuit C2 are connected in parallel, they are connected in series with the output switch K3, and the output switch K3 is connected to the second bus 12 to form a power supply circuit. The maintenance bypass circuit C3 is connected in parallel with the power supply circuit. In the main circuit C1, the bypass circuit C2, and the maintenance bypass circuit C3, each circuit is provided with a switch correspondingly. Specifically, the main circuit C1 includes a main switch K1 and an inverter 133 connected in series. Further, the main circuit C1 further includes a rectifier 132, and the main switch K1, the rectifier 132, and the inverter 133 are connected in series in sequence. The main switch K1 is connected to the first bus 11, and the inverter 133 is connected to the output switch K3. The main circuit C1 further includes a plurality of power modules connected in parallel and in series. The bypass circuit C2 includes a bypass switch K2. One end of the bypass switch K2 is connected to the first bus 11, and the other end is connected to the output switch K3. Further, the bypass circuit C2 may further include a switching transistor 136 connected in series with the bypass switch K2. The bypass switch K2 is connected to the first bus 11, and the switching transistor 136 is connected to the output switch K3. In a specific embodiment, the switching transistor 136 may be a silicon controlled rectifier (SCR). When the bypass circuit C2 is connected to the first bus 11 and the second bus 12, the switching transistor 136 supplies power from the power grid to the load. Among them, the switching transistor 136 can adjust the electrical parameters input from the first bus 11 to the electrical parameters required by the load. The maintenance bypass circuit C3 includes a maintenance bypass switch K4. One end of the maintenance bypass switch K4 is connected to the first bus 11, and the other end is connected to the second bus 12. In addition, the uninterruptible power supply 13 further includes a charging circuit 134 and a battery 135 connected in series. The charging circuit 134 is connected between the rectifier 132 and the inverter 133. The main switch K1 and the output switch K3 are used to conduct and disconnect the main circuit C1, the bypass switch K2 and the output switch K3 are used to conduct and disconnect the bypass circuit C3, and the maintenance bypass switch K4 is used to conduct and disconnect the maintenance bypass circuit C3. When the main circuit C1 is connected to the first bus 11 and the second bus 12, the rectifier 132 outputs electricity to the inverter 133 and the charging circuit 134 respectively. That is to say, part of the commercial power input from the first bus 11 is output to the load through the uninterruptible power supply 13, and the other part charges the battery 135 in the uninterruptible power supply 13. When the commercial power is interrupted or power failure occurs, the uninterruptible power supply 13 can output the electric energy stored in the battery 135 to the load for use through the inverter 133.

[0082] In this application, the circuit being connected to the first bus bar 11 and the second bus bar 12 means that the switch on the circuit is in the conducting state, enabling the electricity of the first bus bar 11 to be output to the second bus bar 12 after passing through the electrical components of the circuit. Connection means a physical connection between devices, which may actually be in a powered state or may also be in an unpowered state.

[0083] When it is necessary to connect the circuit between the power grid (or power supply) and the data center, the main circuit switch K1 and the output switch K3 can be switched to the closed state; when it is necessary to disconnect the circuit between the power grid and the data center, the main circuit switch K1 or the output switch K3 can be switched to the open state. In this way, the on-off state of the data center is controlled by controlling the conducting state and the disconnecting state of the switch. When the electrical equipment in the data center needs to be repaired or maintained, the main circuit switch K1 can be switched to the open state, and the bypass switch K2, the output switch K3, and the maintenance bypass switch K4 can be switched to the closed state, so as to facilitate the repair, maintenance and other work of the electrical equipment.

[0084] When different circuits of the uninterruptible power supply 13 are connected to the first bus bar 11 and the second bus bar 12, the on-off states of each switch and device are different. When the main circuit C1 of the uninterruptible power supply 13 is in the working state, the main circuit switch K1 and the output switch K3 are in the conducting state, and the inverter 133 is in the working state, that is to say, the main circuit C1 is connected to the first bus bar 11 and the second bus bar 12. At this time, the bypass circuit C2 is not connected to the first bus bar 11 and the second bus bar 12. Specifically, in one embodiment, the bypass switch K2 may be in the open state, or, in another embodiment, the bypass switch K2 may be in the conducting state and the switching transistor 136 may be in the open state.

[0085] When the bypass circuit C2 of the uninterruptible power supply 13 is in the working state, the bypass switch K2 and the output switch K3 are in the conducting state, and the switching transistor 136 is in the conducting state, that is to say, the bypass circuit C2 is connected to the first bus bar 11 and the second bus bar 12. At this time, the main circuit C1 is not connected to the first bus bar 11 and the second bus bar 12. Specifically, in one embodiment, the main circuit switch K1 may be in the open state, or, in another embodiment, the main circuit switch K1 may be in the conducting state and the inverter 133 may be in the standby state.

[0086] When the uninterruptible power supply 13 fails, the maintenance bypass circuit C3 is enabled. At this time, the maintenance bypass circuit C3 is in a conducting state, that is to say, the maintenance bypass circuit C3 is connected to the first bus 11 and the second bus 12. At this time, the main circuit C1 is not connected to the first bus 11 and the second bus 12, and the bypass circuit C2 is connected to the first bus 11 and the second bus 12. In the main circuit C1, in one embodiment, the main switch K1 may be in an off state, or, in another embodiment, the main switch K1 may be in an on state and the inverter 133 is in a standby state. In the bypass circuit C2, the bypass switch K2 is in an on state, and the switching transistor 136 is in an on state.

[0087] When the uninterruptible power supply switches circuits, the switch will send a signal to the power supply and distribution system at the moment of closing or opening. However, when the controller of the power supply and distribution system receives this signal, the total voltage in the power supply and distribution system has already undergone an instantaneous change, which is likely to cause voltage overshoot to the inverter of the uninterruptible power supply and the loads in the system, and is not conducive to the safety of the system and the stability of voltage output. In view of this, the present application provides a power supply and distribution system and its control method to switch the circuit of the uninterruptible power supply in advance before the switch conducts or disconnects, so as to maintain the output voltage stability of the power supply and distribution system and avoid voltage overshoot to the uninterruptible power supply and the loads.

[0088] It should be noted that the terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and the appended claims of the present application, the singular forms "a", "an", "the", "above-mentioned", "this" and "such" are also intended to include expressions such as "one or more", unless there is a clear indication to the contrary in the context.

[0089] Reference to "one embodiment" or "some embodiments" etc. described in this specification means that a specific feature, structure or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, statements such as "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments" etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "comprise", "include", "have" and their variants all mean "include but not limited to", unless otherwise specifically emphasized in other ways.

[0090] Please continue to refer to Figure 3 and Figure 4, the main circuit switch K1, bypass switch K2, output switch K3, and maintenance bypass switch K4 of the uninterruptible power supply 13 are respectively electrically connected to the controller. The controller is configured to control only one of the main circuit C1 and the bypass circuit C3 to be connected to the first bus 11 and the second bus 12 and form a loop by controlling the conduction or cutoff of the main circuit switch K1, bypass switch K2, output switch K3, and maintenance bypass switch K4, or to control the bypass circuit C3 and the maintenance bypass circuit C3 to be connected in parallel to the first bus 11 and the second bus 12 and form a loop. When the main circuit C1 is connected to the first bus 11 and the second bus 12 and the maintenance bypass switch K4 is off, during the process of the maintenance bypass switch K4 switching from the off state to the on state, the maintenance bypass switch K4 is configured to switch from sending a first signal to the controller to sending a second signal to the controller before conduction, and the first signal is different from the second signal. The controller can be configured to control the uninterruptible power supply 13 corresponding to the maintenance bypass switch K4 to switch from the main circuit C1 to the bypass circuit C2 before the maintenance bypass switch K4 conducts when the first signal switches to the second signal.

[0091] In a fault repair scenario, the uninterruptible power supply 13 needs to enable the maintenance bypass circuit C3 and switch the main circuit C1 to the bypass circuit C2. In one embodiment, before enabling the maintenance bypass circuit C3, the main circuit switch K1, bypass switch K2, and output switch K3 in the power supply circuit are all in the on state, but only the main circuit C1 is connected to the first bus 11 and the second bus 12. Enabling the maintenance bypass circuit C3 is achieved by conducting the maintenance bypass switch K4. When the maintenance bypass switch K4 performs a closing operation (i.e., during the process of the maintenance bypass switch K4 switching from the open state to the closed state), the signal sent by the maintenance bypass switch K4 to the controller switches from the first signal to the second signal. After receiving the first signal and the second signal, the controller controls the main circuit C1 to switch to the bypass circuit C2 before the maintenance bypass switch K4 conducts when the first signal switches to the second signal, thereby avoiding voltage impact on the main inverter 133 of the power grid when the maintenance bypass circuit C3 conducts instantaneously.

[0092] In the above fault repair scenario, the controller can achieve the switching between the main circuit C1 and the bypass circuit C2 by directly switching the working states of the inverter 133 and the switching transistor 136. Specifically, the controller controls the inverter 133 to switch to the standby state before the maintenance bypass switch K4 conducts. When the inverter 133 is in the standby state, even if the main circuit switch K1 and the output switch K3 are in the on state, the main circuit C1 will not supply the mains power to the load, so that the main circuit C1 is disconnected from the first bus 11 and the second bus 12. And the controller is also configured to control the switching transistor 136 to conduct before the maintenance bypass switch K4 conducts, so that the bypass circuit C2 is connected to the first bus 11 and the second bus 12.

[0093] In another embodiment, before enabling the maintenance bypass circuit C3, only the main circuit C1 is connected to the first bus 11 and the second bus 12. The main circuit switch K1 and the output switch K3 are both in the on state, and the bypass switch K2 is in the off state. At this time, the switching transistor 136 can be on or off. When the maintenance bypass switch K4 performs a closing operation (i.e., when the maintenance bypass switch K4 switches from the open state to the closed state), the signal sent by the maintenance bypass switch K4 to the controller switches from the first signal to the second signal. After receiving the first signal and the second signal, when the first signal switches to the second signal, the controller controls the inverter 133 to switch to the standby state before the maintenance bypass switch K4 is turned on, controls the bypass switch K2 to switch from the off state to the on state before the maintenance bypass switch K4 is turned on, and (when the switching transistor 136 is off before the maintenance bypass switch K4 performs a closing operation) controls the switching transistor 136 to be turned on before the maintenance bypass switch K4 is turned on, so as to avoid a voltage impact on the main inverter 133 of the power grid when the maintenance bypass circuit C3 is turned on instantaneously.

[0094] During actual operation, the power supply and distribution system 10 includes a plurality of uninterruptible power supplies 13, and these uninterruptible power supplies 13 operate in a parallel mode, that is, the plurality of uninterruptible power supplies 13 are connected in parallel to the first bus 11 and the second bus 12. In the parallel mode, the power supply and distribution system 10 can increase or decrease the number of uninterruptible power supplies 13 according to actual needs.

[0095] In the parallel mode, when it is necessary to increase or decrease the uninterruptible power supplies 13 in the working state in the power supply and distribution system 10, it can be achieved by controlling the on or off of the switch of the main circuit C1. For example, the output switch K3 can be used to switch the signal sent to the controller before being turned on or off. The controller is used to control the inverters 133 of other uninterruptible power supplies 13 to adjust the output voltage according to different signals before and after the switch, so that the voltage output from the second bus 12 to the load remains stable when the number of uninterruptible power supplies 13 is increased or decreased, thereby maintaining the output voltage stability of the power supply and distribution system 10 and avoiding overvoltage or undervoltage phenomena on the uninterruptible power supplies 13 and the load. Similarly, the main circuit switch K1 can also be used to switch the signal sent to the controller before being turned on or off, which will not be elaborated here.

[0096] Taking the example of adding uninterruptible power supplies 13 connected to the first bus 11 and the second bus 12 in the power supply and distribution system 10, the power supply and distribution system 10 may include m uninterruptible power supplies 13 and n uninterruptible power supplies 13, where m and n are positive integers greater than or equal to 1 respectively. Among them, the main circuits C1 of the above m uninterruptible power supplies 13 have been connected to the first bus 11 and the second bus 12 respectively, and the main circuits C1 of the above n uninterruptible power supplies 13 are not connected to the first bus 11 and the second bus 12.

[0097] In one embodiment, in at least one of the above n uninterruptible power supplies 13, one of the main switch K1 and the output switch K3 is in the on state and the other is in the off state. During the process of connecting the main circuit C1 of the above at least one uninterruptible power supply 13 to the first bus 11 and the second bus 12, during the process of the other one in the off device switching from the off state to the on state, the other one is used to switch from sending a third signal to the controller to sending a fourth signal to the controller before conduction, and the third signal is different from the fourth signal. The controller is used to control the output voltage of the inverters 133 of the above m uninterruptible power supplies 13 to decrease when the third signal switches to the fourth signal, so that after the main circuit C1 of at least one uninterruptible power supply 13 is connected to the first bus 11 and the second bus 12, the voltage output by the above m uninterruptible power supplies 13 to the second bus 12 remains stable to prevent the voltage supplied to the load from being too high.

[0098] In another embodiment, in at least one of the above n uninterruptible power supplies 13, the main switch K1 and the output switch K3 may be simultaneously in the off state. During the process of connecting the main circuit C1 of the above at least one uninterruptible power supply 13 to the first bus 11 and the second bus 12, during the process of the main switch K1 and the output switch K3 simultaneously switching from the off state to the on state, at least one of the main switch K1 and the output switch K3 is used to switch from sending a third signal to the controller to sending a fourth signal to the controller before conduction. The controller is used to control the output voltage of the inverters 133 of the above m uninterruptible power supplies 13 to decrease when the third signal switches to the fourth signal, so that after the main circuit C1 of at least one uninterruptible power supply 13 is connected to the first bus 11 and the second bus 12, the voltage output by the above m uninterruptible power supplies 13 to the second bus 12 remains stable to prevent the voltage supplied to the load from being too high. Of course, during the actual operation of this embodiment, the main switch K1 and the output switch K3 may also be closed in a sequential order. At this time, the controller controls the output voltage of the inverter 133 according to the third signal and the fourth signal sent by the latter.

[0099] Taking the reduction of the uninterruptible power supply 13 connected to the first bus 11 and the second bus 12 in the power supply and distribution system 10 as an example, the power supply and distribution system 10 may include N uninterruptible power supplies 13, where N is a positive integer greater than 1. The main circuits C1 of the aforementioned N uninterruptible power supplies 13 have been connected to the first bus 11 and the second bus 12 respectively.

[0100] In one embodiment, during the process of disconnecting the main circuits C1 of M uninterruptible power supplies 13 among the aforementioned N uninterruptible power supplies 13 from the first bus 11 and the second bus 12, one of the main switches K1 and the output switches K3 of the aforementioned M uninterruptible power supplies 13 is first disconnected, and this one is used to switch from sending a fourth signal to the controller to sending a third signal to the controller before disconnection. The third signal is different from the fourth signal. M is a positive integer greater than or equal to 1 and less than N. The controller is used to control the output voltage of the inverters 133 of the remaining uninterruptible power supplies 13 among the N uninterruptible power supplies 13 to increase when the fourth signal is switched to the third signal, so that after the main circuits C1 of the M uninterruptible power supplies 13 are disconnected from the first bus 11 and the second bus 12, the voltage output by the remaining uninterruptible power supplies 13 to the second bus 12 remains stable to prevent the voltage supplied to the load from being too low.

[0101] In another embodiment, during the process of disconnecting the main circuits C1 of M uninterruptible power supplies 13 among the above-mentioned N uninterruptible power supplies 13 from the first bus 11 and the second bus 12, the main switches K1 and the output switches K3 of the aforementioned M uninterruptible power supplies 13 are disconnected, and the main switches K1 and the output switches K3 are switched from sending a fourth signal to the controller to sending a third signal to the controller before disconnection. The third signal is different from the fourth signal. The aforementioned M is a positive integer greater than or equal to 1 and less than N. The controller is used to control the output voltage of the inverters 133 of the remaining uninterruptible power supplies 13 among the N uninterruptible power supplies 13 to increase when the fourth signal is switched to the third signal, so that after the main circuits C1 of the aforementioned M uninterruptible power supplies 13 are disconnected from the first bus 11 and the second bus 12, the voltage output by the remaining uninterruptible power supplies 13 to the second bus 12 remains stable to prevent the voltage supplied to the load from being too low.

[0102] In this application, the specific types of the main switch K1, the bypass switch K2, the output switch K3, and the maintenance bypass switch K4 are not limited. For example, the main switch K1 can be a circuit breaker, or the main switch K1 can include a disconnecting switch and a fuse. The bypass switch K2 can be a circuit breaker, or the bypass switch K2 can include a disconnecting switch and a fuse. The output switch K3 can be a circuit breaker, or the output switch K3 can include a disconnecting switch and a fuse. The maintenance bypass switch K4 can be a circuit breaker, or the maintenance bypass switch K4 can include a disconnecting switch and a fuse.

[0103] The main circuit switch K1, the output switch K3, and the maintenance bypass switch K4 can switch the signals sent to the controller before conduction or disconnection, which can be achieved by a micro switch. In one embodiment, each of the main circuit switch K1, the output switch K3, and the maintenance bypass switch K4 may include a micro switch. The first signal, the second signal, the third signal, and the fourth signal may all be the level signals of the micro switch. For the above-mentioned main circuit switch K1, output switch K3, and maintenance bypass switch K4, when the switch is in the conduction state, the micro switch is used to send a first level signal to the controller. When the switch is in the off state, the micro switch is used to send a second level signal to the controller, where the first level signal and the second level signal are different. During the process of the switch switching from the closing state to the opening state, the micro switch is used to switch from sending the first level signal to the controller to sending the second level signal before the switch is turned off. During the process of the switch switching from the opening state to the closing state, the micro switch is used to switch from sending the second level signal to the controller to sending the first level signal before the switch is turned on. The controller further controls the inverter 133 and the switching transistor 136 according to the switching changes of the first level signal and the second level signal. By using the micro switch, the structure of the main circuit switch K1, the output switch K3, and the maintenance bypass switch K4 can be avoided from being complicated, and through the change of the level signal of the micro switch, the controller can directly judge whether the corresponding switch performs a closing or opening operation, so as to control the circuit switching of the uninterruptible power supply 13.

[0104] In one embodiment, the main circuit switch K1, the output switch K3, and the maintenance bypass switch K4 are all circuit breakers. Figure 5 A schematic diagram of the circuit breaker provided by the embodiment of the present application, Figure 6 is Figure 5 a schematic diagram of the circuit breaker along the A-A direction. As Figure 5 and Figure 6As shown, the circuit breaker 30 includes a housing 31, an operating handle 32, an operating mechanism 33, and a current-carrying component 34. Specifically, the operating handle 32 is connected to the operating mechanism 33. The current-carrying component 34 includes a moving contact component 341 and a static contact 342, and the moving contact component 341 can rotate relative to the housing 31. The moving contact component 341 includes a moving contact 3411. The static contact 342 can be arranged on the side of the moving contact component 341 away from the operating mechanism 33 along the depth direction of the circuit breaker 30, or the static contact 342 can also be arranged on the side of the moving contact component 341 away from the operating mechanism 33 along the height direction of the circuit breaker 30. In one embodiment, the end of the operating handle 32 away from the operating mechanism 33 can extend out of the housing 31 so that the staff can push the operating handle 32 to perform closing and opening operations. In another embodiment, the housing 31 is provided with a knob to manually operate the circuit breaker 30 to trip and close through the knob. Specifically, the end of the operating handle 32 away from the operating mechanism 33 is connected to the knob. When the staff performs manual operation of the knob, the knob is rotated to drive the operating handle 32 to push along the height direction h of the circuit breaker 30. In another embodiment, the circuit breaker 30 can further include a remote controller and an electric operating device. The electric operating device is connected to the operating handle 32 and is communicatively connected to the remote controller to trip and close the circuit breaker 30 through electric operation. When the staff performs electric operation, a closing instruction or an opening instruction is sent to the remote controller, and the remote controller can control the electric operating device to push the operating handle 32. In this embodiment, the staff can issue an instruction close to the circuit breaker 30 or can also issue an instruction remotely through a communication device.

[0105] As Figure 6 shown, in one embodiment, at least the part of the operating handle 32 close to the operating mechanism 33, the operating mechanism 33, and the moving contact component 341 can be sequentially arranged in the housing 31 along the depth direction d of the circuit breaker 30. The operating handle 32 is used to control the operating mechanism 33 to drive the moving contact component 341 to move so that the moving contact 3411 contacts or separates from the static contact 342. Further, the circuit breaker 30 can further include an arc extinguishing chamber 35. The arc extinguishing chamber 35 is located on the side of the moving contact component 341 away from the operating mechanism 33 along the depth direction d of the circuit breaker 30. The arc extinguishing chamber 35 is used to eliminate the arc generated when the moving contact 3411 separates from the static contact 342. In one embodiment, the static contact 342 is located on one side of the arc extinguishing chamber 35 along the height direction h of the circuit breaker 30. The movement trajectory of the moving contact 3411 extends from the static contact 342 to the other side of the arc extinguishing chamber 35 along the height direction h of the circuit breaker 30.

[0106] In this application, the side where the operating handle 32 extends out of the housing 31 is the circuit breaker operating surface 310. Taking the circuit breaker operating surface 310 as an example, the dimension of the circuit breaker 30 in the pushing direction of the operating handle 32 is the height, the dimension perpendicular to the height direction h is the width, and the dimension perpendicular to the circuit breaker operating surface 310 is the depth. In other words, the operating handle 32, the operating mechanism 33, the current-carrying component 34, and the arc extinguishing chamber 35 are arranged in sequence along the depth direction d of the circuit breaker 30. As Figure 3 shown, when the circuit breaker 30 is placed in the cabinet 131, in one embodiment, the height direction h of the circuit breaker 30 can be the same as the width direction W of the cabinet 131, the width direction w of the circuit breaker 30 can be the same as the height direction H of the cabinet 131, and the depth direction d of the circuit breaker 30 can be the same as the depth direction D of the cabinet 131. Therefore, when the staff performs a closing operation or a tripping operation on the circuit breaker 30, the staff pushes the operating handle 32 along the width direction W of the cabinet 131. When pushing the operating handle 32 to perform a tripping operation or a closing operation, the operating mechanism 33 can move along with the operating handle 32 to drive the moving contact 3411 to separate from or contact the static contact 342. When the moving contact 3411 contacts the static contact 342, the circuit breaker 30 is in the closed state; when the moving contact 3411 separates from the static contact 342, the circuit breaker 30 is in the tripped state. Of course, in another embodiment, the width direction w of the circuit breaker 30 can be the same as the width direction W of the cabinet 131, the height direction h of the circuit breaker 30 can be the same as the height direction H of the cabinet 131, and the depth direction d of the circuit breaker 30 can be the same as the depth direction D of the cabinet 131. This application does not make specific restrictions.

[0107] As Figure 6As shown, when the operating handle 32, the operating mechanism 33, the current-passing assembly 34 and the arc-extinguishing chamber 35 are sequentially arranged along the depth direction d of the circuit breaker 30, the housing 31 may include a front cover 311 and a rear cover assembly 312 sequentially arranged along the depth direction d of the circuit breaker 30. At least the portion of the operating handle 32 close to the operating mechanism 33, the operating mechanism 33, the moving contact assembly 341 and the arc-extinguishing chamber 35 are sequentially arranged in the rear cover assembly 312 along the depth direction d of the circuit breaker 30, and the operating handle 32 is arranged close to the front cover 311. Therefore, the operating handle 32, the operating mechanism 33, the moving contact assembly 341 and the arc-extinguishing chamber 35 are considered to be arranged in a layered form, thereby reducing the height dimension of the circuit breaker 30 and reducing the occupied space of the circuit breaker 30, so as to increase the number of circuit breakers 30 that can be arranged in the cabinet 131. Specifically, the operating handle 32 is located at the first layer (electrical or manual operation layer), the operating mechanism 33 is located at the second layer (operating layer), a part of the current-passing assembly 34 is located at the third layer (current-passing layer), and the arc extinguishing chamber 35 is located at the fourth layer (arc extinguishing layer). Among them, the moving contact 3411 can extend along the depth direction d of the circuit breaker 30, so that the size of the moving contact 3411 in the height direction h of the circuit breaker 30 is reduced, which can be beneficial to minimizing the height direction h of the circuit breaker 30. In addition, while the moving contact 3411 is miniaturized, the driving force arm of the moving contact 3411 and the static contact 342 for closing the switch can be larger, thereby reducing the driving force of the operating mechanism 33, which is beneficial to the operational stability of the operating mechanism 33.

[0108] Figure 7 for Figure 5 A cross-sectional view of the circuit breaker along the AA direction, where: Figure 7 The operating handle, operating mechanism and arc extinguishing chamber are omitted, and the circuit breaker is in the closed state. Figure 7 As shown, the moving contact assembly 341 includes a main shaft 3412 and a rotating rod 3413, and the main shaft 3412 and the rotating rod 3413 are respectively rotatably connected to the housing 31. One end of the rotating rod 3413 is arranged close to the main shaft 3412, and the rotating rod 3413 extends in a direction away from the operating mechanism 33, and the moving contact 3411 is arranged at one end of the rotating rod 3413 away from the operating mechanism 33. The operating mechanism 33 is transmission-connected to the main shaft 3412, and the operating handle 32 is used to control the operating mechanism 33 to drive the main shaft 3412 to rotate, so that the moving contact 3411 is in contact with or separated from the static contact 342.

[0109] Figure 8 A schematic diagram of a main shaft provided in an embodiment of the present application, Figure 9 Another schematic diagram of the main shaft provided in the embodiment of the present application, wherein: Figure 9 Show Figure 8 The cross-sectional view of the central axis along the BB direction. Figure 8 and Figure 9As shown, a boss 34121 is provided on the main shaft 3412. The boss 34121 is used to contact the rotating rod 3413 and drive the rotating rod 3413 to rotate, so that the moving contact 3411 is separated from the static contact 342. The circuit breaker 30 further includes a first micro switch 36, and the first micro switch 36 is electrically connected to the controller. A lever 34122 is provided on the main shaft 3412, and the lever 34122 is used to conduct or disconnect the first micro switch 36. When the circuit breaker 30 is in the closed state, the moving contact 3411 contacts the static contact 342, the boss 34121 is spaced from the rotating rod 3413 by a set distance, and the lever 34122 presses the first micro switch 36 to make the first micro switch 36 conductive.

[0110] Figure 10 FIG. is a schematic diagram of the moving contact assembly provided by an embodiment of the present application. Figure 11 FIG. is another schematic diagram of the moving contact assembly provided by an embodiment of the present application, where Figure 11 shows Figure 10 a cross-sectional view of the main shaft along the C-C direction in. As Figure 10 and Figure 11 shown, when the circuit breaker 30 performs a tripping operation, the circuit breaker 30 switches from the closed state to the tripped state. During the process of the circuit breaker 30 switching from the closed state to the tripped state, the operating mechanism 33 drives the main shaft 3412 to rotate in the first direction (such as Figure 7 the clockwise direction in), so that the lever 34122 gradually moves away from the first micro switch 36, and the boss 34121 moves towards the rotating rod 3413, so that before the boss 34121 contacts the rotating rod 3413, the first micro switch 36 is disconnected and switches from sending a first level signal to the controller to sending a second level signal to the controller. In this way, during the rotation of the main shaft 3412, the lever 34122 gradually moves away from the first micro switch 36, and at the same time the boss 34121 moves towards the rotating rod 3413. And before the boss 34121 contacts the rotating rod 3413, the first micro switch 36 is disconnected and the signal sent to the controller is switched. Subsequently, the boss 34121 contacts the rotating rod 3413 and pushes the rotating rod 3413 to rotate, so that the moving contact 3411 is separated from the static contact 342. That is to say, the first micro switch 36 is disconnected before the moving contact 3411 is separated from the static contact 342, and the controller can judge the first level signal and the second level signal sent by the first micro switch 36, so as to control the circuit of the uninterruptible power supply 13 to switch or adjust the output voltage in advance, so as to ensure the stability of the output voltage, and improve the voltage overshoot or undershoot phenomenon of the uninterruptible power supply 13, and ensure that the parallel current sharing control of the power supply and distribution system 10 is smoother.

[0111] Figure 12 is Figure 7 a partial enlarged view within the dashed box in. As Figure 12As shown in the figure, when specifically setting the first microswitch 36, the first microswitch 36 includes a first fixing plate 361, a first moving contact 362, a first static contact 363, and a first spring 364. The first fixing plate 361 is relatively fixed to the housing 31. The first moving contact 362 is slidably connected to the first fixing plate 361. The first static contact 363 and the first spring 364 are respectively located on the side of the first moving contact 362 away from the lever 34122. The first static contact 363 is relatively fixed to the first fixing plate 361. One end of the first spring 364 is relatively fixed to the first moving contact 362, and the other end of the first spring 364 is relatively fixed to the first fixing plate 361. The lever 34122 is used to push the first moving contact 362, so that the first moving contact 362 slides on the first fixing plate 361 in the direction close to the first static contact 363 and contacts the first static contact 363, so that the first microswitch 36 is turned on. The lever 34122 is also used to separate from the first moving contact 362, so that the first moving contact 362 slides on the first fixing plate 361 in the direction away from the first static contact 363 and separates from the first static contact 363, so that the first microswitch 36 is turned off. The structure of the first microswitch 36 is simple. During the process of the lever 34122 following the rotation of the main shaft 3412, the lever 34122 pushes the first moving contact 362, so that the first moving contact 362 contacts the first static contact 363, so as to turn on the first microswitch 36, thereby avoiding misoperation. In addition, the first spring 364 can push the first moving contact 362 away from the first static contact 363 during the process of the lever 34122 moving away from the first moving contact 362. And when the lever 34122 pushes the first moving contact 362, the first spring 364 can play a buffering role to reduce the impact force of the first moving contact 362 on the first static contact 363.

[0112] In one embodiment, a first limiting rib 3611 is provided at one end of the first fixing plate 361 close to the lever 34122. The first limiting rib 3611 is used to limit the position of the first moving contact 362 relative to the first fixing plate after the first microswitch 36 is turned off, thereby limiting the maximum distance between the first moving contact 362 and the first static contact 363, and making the lever 34122 start to move away from the first moving contact 362 when the main shaft 3412 starts to rotate in the first direction. In other words, when the first moving contact 362 slides towards the first limiting rib 3611 and contacts the first limiting rib 3611, the first moving contact 362 and the first static contact 363 are turned off. And during the process of the circuit breaker 30 closing, the lever 34122 approaches the first moving contact 362 and pushes the first moving contact 362 to slide towards the first static contact 363, so that after closing, the first moving contact 362 and the first static contact 363 are in contact, and the first microswitch 36 is turned on.

[0113] Figure 13Schematic diagram of the travel and level of the first microswitch provided by the embodiment of the present application. As Figure 13 shown, when the main shaft 3412 is at travel position 1, the circuit breaker 30 is in the closed state, and the moving contact 3411 and the static contact 342 are in contact. When the main shaft 3412 starts to rotate in the first direction, at travel position 2, the first moving contact 362 and the first static contact 363 are separated, and at this time, the level signal of the first microswitch 36 changes, switching from the first level signal to the second level signal. The main shaft 3412 continues to rotate, from travel position 2 to travel position 3, and the first moving contact 362 moves away from the first static contact 363, and at this time, the level signal of the first microswitch 36 remains unchanged. At point A, the first moving contact 362 is at the maximum travel position, that is, the distance between the first moving contact 362 and the first static contact 363 is the largest, and then the first moving contact 362 stops moving. At travel position 3, the boss 34121 contacts the rotating rod 3413. When the main shaft 3412 continues to rotate from travel position 3, the boss 34121 starts to drive the rotating rod 3413 to rotate.

[0114] Figure 14 is Figure 5 another cross-sectional view of the circuit breaker along the A-A direction, Figure 15 is Figure 14 the partial enlarged view within the dashed box in Figure 14 which omits the operating handle, the operating mechanism, and the arc extinguishing chamber, and the circuit breaker is in the open state. As Figure 14 and Figure 15As shown, the circuit breaker 30 may further include a second micro switch 37 disposed near the toggle lever 34122. The toggle lever 34122 is also used to conduct or disconnect the second micro switch 37. When the circuit breaker 30 is in the open state, the moving contact 3411 is separated from the static contact 342, the convex platform 34121 contacts the rotating lever 3413, and the toggle lever 34122 presses the second micro switch 37 to conduct the second micro switch 37. When the circuit breaker 30 performs a closing operation, the circuit breaker 30 switches from the open state to the closing state. During the process of the circuit breaker 30 switching from the open state to the closing state, the operating mechanism 33 drives the main shaft 3412 to rotate in the second direction (the second direction is opposite to the first direction), causing the toggle lever 34122 to gradually move away from the second micro switch 37, and causing the rotating lever 3413 to rotate towards the static contact 342, so that before the moving contact 3411 contacts the static contact 342, the second micro switch 37 is disconnected and the signal sent to the controller is switched from the first level signal to the second level signal. During the rotation of the main shaft 3412, the toggle lever 34122 gradually moves away from the second micro switch 37, and at the same time, the moving contact 3411 moves towards the static contact 342. Before the moving contact 3411 contacts the static contact 342, the second micro switch 37 is disconnected and the signal sent to the controller is switched. Subsequently, the moving contact 3411 contacts the static contact 342 to close the circuit breaker 30. That is to say, the second micro switch 37 is disconnected before the moving contact 3411 contacts the static contact 342, and the controller can judge the first level signal and the second level signal sent by the second micro switch 37, so as to control the circuit switching of the uninterruptible power supply 13 in advance or adjust the output voltage of the uninterruptible power supply 13, so as to ensure the stability of the output voltage, improve the phenomenon of voltage overshoot or undershoot, and ensure smoother parallel current sharing control of the power supply and distribution system 10.

[0115] In the above embodiment, in order to prepare for the next opening operation, when the circuit breaker 30 performs a closing operation (that is, during the process of the circuit breaker 30 switching from the open state to the closing state), after the moving contact 3411 contacts the static contact 342, the main shaft 3412 continues to rotate in the second direction, so that the convex platform 34121 is separated from the rotating lever 3413 and spaced apart by a set distance.

[0116] As Figure 15As shown in the figure, when specifically setting the second microswitch 37, the second microswitch 37 includes a second fixed plate 371, a second moving contact 372, a second static contact 373, and a second spring 374. The second fixed plate 371 is fixedly opposed to the housing 31. The second moving contact 372 is slidably connected to the second fixed plate 371, and the second static contact 373 and the second spring 374 are respectively located on a side of the second moving contact 372 away from the lever 34122. The second static contact 373 is fixedly opposed to the second fixed plate 371. One end of the second spring 374 is fixedly opposed to the second moving contact 372, and the other end of the second spring 374 is fixedly opposed to the second fixed plate 371. The lever 34122 is used to push the second moving contact 372, so that the second moving contact 372 slides on the second fixed plate 371 in a direction close to the second static contact 373 and contacts the second static contact 373, so that the second microswitch 37 is turned on. The lever 34122 is also used to separate from the second moving contact 372, so that the second moving contact 372 slides on the second fixed plate 371 in a direction away from the second static contact 373 and separates from the second static contact 373, so that the second microswitch 37 is turned off. The structure of the second microswitch 37 is simple. The lever 34122 rotates with the main shaft 3412 and pushes the second moving contact 372, so that the second moving contact 372 contacts the second static contact 373, so as to turn on the second microswitch 37, thereby avoiding misoperation. In addition, the second spring 374 can push the second moving contact 372 away from the second static contact 373 during the process that the lever 34122 moves away from the second moving contact 372. And, when the lever 34122 pushes the second moving contact 372, the second spring 374 can play a buffering role to reduce the impact force of the second moving contact 372 on the second static contact 373.

[0117] In one embodiment, a second limiting rib 3711 is provided at one end of the second fixed plate 371 close to the lever 34122. The second limiting rib 3711 is used to limit the position of the second moving contact 372 relative to the second fixed plate 371 when the second microswitch 37 is turned off, thereby limiting the maximum distance between the second moving contact 372 and the second static contact 373, and making the lever 34122 start to move away from the second moving contact 372 when the main shaft 3412 starts to rotate in the second direction. In other words, when the second moving contact 372 slides towards the second limiting rib 3711 and contacts the second limiting rib 3711, the second moving contact 372 is disconnected from the second static contact 373. And, during the process of opening the circuit breaker 30, the lever 34122 approaches the second moving contact 372 and pushes the second moving contact 372 to slide towards the second static contact 373, so that the second moving contact 372 and the second static contact 373 contact after closing, and the second microswitch 37 is turned on.

[0118] Figure 16 It is a schematic diagram of the stroke and level of the second microswitch provided by the embodiment of the present application. AsFigure 16 As shown, when the main shaft 3412 is at stroke 1, the circuit breaker 30 is in the open state, and the moving contact 3411 and the static contact 342 are separated. When the main shaft 3412 starts to rotate in the second direction, at stroke 2, the second moving contact 372 and the second static contact 373 are separated, and at this time, the level signal of the second microswitch 37 changes and the transmitted signal is switched. The main shaft 3412 continues to rotate, from stroke 2 to stroke 3, and the second moving contact 372 moves away from the second static contact 373, and at this time, the level signal of the second microswitch 37 remains unchanged. At point B, the second moving contact 372 is at the maximum stroke, that is, the distance between the second moving contact 372 and the second static contact 373 is the largest, and then the second moving contact 372 stops moving.

[0119] In the circuit breaker 30 of the present application, the moving contact assembly 341 may further include a third spring 3414. One end of the third spring 3414 is connected to the rotating rod 3413, and the other end is connected to the main shaft 3412. The third spring 3414 is used to keep the rotating rod 3413 in contact with the boss 34121 so that the rotating rod 3413 and the main shaft 3412 are relatively fixed. That is to say, when the rotating rod 3413 contacts the boss 34121, the third spring 3414 can make the rotating rod 3413 and the main shaft 3412 relatively fixed.

[0120] In the embodiment of the present application, the circuit breaker 30 may be provided with only the first microswitch 36, or may be provided with only the second microswitch 37, or may be provided with both the first microswitch 36 and the second microswitch 37 at the same time.

[0121] As Figure 7 and Figure 14 shown, in one embodiment, the first microswitch 36 and the second microswitch 37 are oppositely arranged along the height direction h of the circuit breaker 30, and the first microswitch 36 and the second microswitch 37 are located between the moving contact assembly 341 and the operating mechanism 33, and the lever 34122 extends between the first microswitch 36 and the second microswitch 37. That is to say, during the process of the moving contact 3411 and the static contact 342 switching from the contact state to the separated state and from the separated state to the contact state, the lever 34122 moves between the first microswitch 36 and the second microswitch 37.

[0122] Specifically set the positions of the first microswitch 36 and the second microswitch 37. A baffle 38 is arranged inside the housing 31. The baffle 38 is located between the moving contact assembly 341 and the operating mechanism 33, and the baffle 38 extends along the height direction h of the circuit breaker 30. The baffle 38 is provided with an opening 381, and the toggle lever 34122 passes through the opening 381. The first microswitch 36 and the second microswitch 37 are located on the side of the baffle 38 close to the operating mechanism 33, and the first microswitch 36 and the second microswitch 37 are oppositely arranged on both sides of the opening 381. Therefore, in this embodiment, the first microswitch 36 and the second microswitch 37 are arranged by using the space between the operating mechanism 33 and the moving contact assembly 341, which is beneficial to simplifying the structure of the circuit breaker 30. In one embodiment, the first fixing plate 361 and the second fixing plate 371 can be fixedly connected to the housing 31. In another embodiment, the first fixing plate 361 and the second fixing plate 371 can be part of the housing 31 and jointly form the baffle 38.

[0123] Based on the same technical concept, the present application also provides a control method for a power supply and distribution system. This control method can be used to control the power supply and distribution system 10 of any of the above embodiments. The control method of the present application specifically includes:

[0124] Step 101, receive the first signal and the second signal sent by the maintenance bypass switch, where the first signal is different from the second signal;

[0125] Step 102, when the first signal is switched to the second signal, control the uninterruptible power supply corresponding to the maintenance bypass switch to switch from the main circuit to the bypass circuit before the maintenance bypass switch is turned on.

[0126] In the power supply and distribution system 10 to which the above control method is applied, the main circuit C1, the bypass circuit C2, and the maintenance bypass circuit C3 of the uninterruptible power supply 13 are respectively connected to the first bus 11 and the second bus 12 through different switches. By controlling the conduction or disconnection of each switch, different circuits of the uninterruptible power supply 13 can be switched to work. In the scenario of fault repair, the maintenance bypass circuit C3 of the uninterruptible power supply 13 needs to be enabled, and the main circuit C1 is switched to the bypass circuit C2. Before the maintenance bypass circuit C3 is enabled, only the main circuit C1 is connected to the first bus 11 and the second bus 12, and the maintenance bypass switch K4 is in the off state. Enabling the maintenance bypass circuit C3 is achieved by turning on the maintenance bypass switch K4. When the maintenance bypass switch K4 performs a closing operation (i.e., when the maintenance bypass switch K4 switches from the off state to the on state), the signal sent by the maintenance bypass switch K4 is switched from the first signal to the second signal. When the first signal is switched to the second signal, the main circuit C1 can be controlled to switch to the bypass circuit C2 before the maintenance bypass switch K4 is turned on, thereby avoiding voltage impact on the main inverter 133 of the power grid when the maintenance bypass circuit C3 is turned on instantaneously.

[0127] The control method can also be applied to the parallel operation mode. Specifically, when adding an uninterruptible power supply 13 in the parallel operation mode, the power supply and distribution system 10 includes m uninterruptible power supplies 13 and n uninterruptible power supplies 13, where m and n are positive integers greater than or equal to 1. Among them, the main circuits C1 of the foregoing m uninterruptible power supplies 13 have been connected to the first bus 11 and the second bus 12 respectively, and the main circuits C1 of the foregoing n uninterruptible power supplies 13 are not connected to the first bus 11 and the second bus 12.

[0128] In one embodiment, within at least one of the foregoing n uninterruptible power supplies 13, when one of the main switch K1 and the output switch K3 is in the on state and the other is in the off state, the control method specifically includes:

[0129] Step 201, receive a third signal and a fourth signal sent by the other one;

[0130] Step 202, when the third signal is switched to the fourth signal, control the output voltage of the inverters of the other uninterruptible power supplies connected to the first bus and the second bus to decrease.

[0131] In another embodiment, within at least one of the foregoing n uninterruptible power supplies 13, when the main switch K1 and the output switch K3 are in the off state, the control method specifically includes:

[0132] Step 301, receive a third signal and a fourth signal sent by the main switch and the output switch;

[0133] Step 302, when the third signal is switched to the fourth signal, control the output voltage of the inverters of the other uninterruptible power supplies connected to the first bus and the second bus to decrease.

[0134] In this way, after adding the uninterruptible power supply 13, the voltage output by the other uninterruptible power supplies 13 to the second bus 12 remains stable, preventing the voltage supplied to the load from being too high.

[0135] When reducing the uninterruptible power supply 13 in the parallel operation mode, the power supply and distribution system 10 includes N uninterruptible power supplies 13, and N is a positive integer greater than 1. The main circuits C1 of the foregoing N uninterruptible power supplies 13 have been connected to the first bus 11 and the second bus 12 respectively.

[0136] In one embodiment, during the process of disconnecting the main circuits C1 of M of the foregoing N uninterruptible power supplies 13 from the first bus 11 and the second bus 12, one of the main switches K1 and the output switches K3 of the foregoing M uninterruptible power supplies 13 is first disconnected, and the control method specifically includes:

[0137] Step 401: Receive the third signal and the fourth signal sent by the above-mentioned one;

[0138] Step 402: When the fourth signal switches to the third signal, control the output voltage of the inverters of the remaining uninterruptible power supplies among the above-mentioned N uninterruptible power supplies to increase.

[0139] In another embodiment, during the process that the main circuit C1 of M uninterruptible power supplies 13 among the above-mentioned N uninterruptible power supplies 13 is disconnected from the first bus 11 and the second bus 12, the main switches K1 and the output switches K3 of the foregoing M uninterruptible power supplies 13 are disconnected simultaneously, and the control method specifically includes:

[0140] Step 501: Receive the third signal and the fourth signal sent by the main switch and the output switch;

[0141] Step 502: When the fourth signal switches to the third signal, control the output voltage of the inverters of the remaining uninterruptible power supplies among the above-mentioned N uninterruptible power supplies to increase.

[0142] In this way, after reducing the uninterruptible power supplies 13, the voltage output by the remaining uninterruptible power supplies 13 to the second bus 12 remains stable, preventing the voltage supplied to the load from being too low.

[0143] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A power supply and distribution system, characterized in that: It includes a first bus, a second bus, a controller and an uninterruptible power supply, wherein: The first busbar is electrically connected to the power grid, and the second busbar is electrically connected to the load; The uninterruptible power supply includes a main circuit, a bypass circuit and an output switch, wherein the main circuit and the bypass circuit are respectively connected to the first bus, and the main circuit and the bypass circuit are connected in parallel and then connected in series with the output switch, and the output switch is connected to the second bus; the main circuit includes a main switch and an inverter connected in series, wherein the main switch is connected to the first bus, and the inverter is connected to the output switch; the bypass circuit includes a bypass switch, wherein one end of the bypass switch is connected to the first bus, and the other end is connected to the output switch; each uninterruptible power supply also includes a maintenance bypass circuit, wherein the maintenance bypass circuit includes a maintenance bypass switch, wherein one end of the maintenance bypass switch is connected to the first bus, and the other end is connected to the second bus; The main switch and the output switch are used to turn on and off the main circuit, the bypass switch and the output switch are used to turn on and off the bypass circuit, and the maintenance bypass switch is used to turn on and off the maintenance bypass circuit; the output switch, the main switch, the bypass switch and the maintenance bypass switch are electrically connected to the controller respectively; The controller is used to control the output switch, the main switch, the bypass switch and the maintenance bypass switch to be turned on or off, so as to control only one of the main circuit and the bypass circuit to be connected to the first bus and the second bus to form a loop, or to control the bypass circuit and the maintenance bypass circuit to be connected in parallel to the first bus and the second bus to form a loop; When the main circuit is connected to the first bus and the second bus and the maintenance bypass switch is disconnected, during the process of switching the maintenance bypass switch from an disconnected state to an on state, the maintenance bypass switch is used to switch from sending a first signal to the controller to sending a second signal to the controller before being turned on, and the first signal is different from the second signal; the controller is used to control the uninterruptible power supply to switch from the main circuit to the bypass circuit before the maintenance bypass switch is turned on when the first signal is switched to the second signal.

2. The power supply and distribution system according to claim 1, characterized in that: The uninterruptible power supply is switched from the main circuit to the bypass circuit, specifically comprising: The controller controls the inverter to switch to a standby state before the maintenance bypass switch is turned on, and controls the bypass switch to be turned on before the maintenance bypass switch is turned on.

3. The power supply and distribution system according to claim 2, characterized in that: The bypass switch includes a circuit breaker and a switching transistor; When the bypass circuit is disconnected, at least one of the circuit breaker and the switching transistor is in an off state, wherein: In the case that only one of the circuit breaker and the switching transistor is in the off state, during the process of the bypass switch switching from the off state to the on state, the controller controls the circuit breaker or the switching transistor to be turned on before the maintenance bypass switch is turned on; or When the circuit breaker and the switch transistor are both in an off state, during the process of the bypass switch switching from an off state to an on state, the controller controls the circuit breaker and the switch transistor to be turned on respectively before the maintenance bypass switch is turned on.

4. The power supply and distribution system according to any one of claims 1 to 3, characterized in that: The power supply and distribution system comprises m uninterruptible power supplies and n uninterruptible power supplies, wherein m and n are respectively positive integers greater than or equal to 1; the main circuits of the m uninterruptible power supplies are respectively connected to the first bus and the second bus, and the main circuits of the n uninterruptible power supplies are not connected to the first bus and the second bus; In at least one of the n uninterruptible power supplies, one of the main switch and the output switch is in an on state, and the other is in an off state; in the process of connecting the main circuit of the at least one uninterruptible power supply to the first bus and the second bus, in the process of switching the main switch or the output switch from an off state to an on state, the main switch or the output switch is used to switch from sending a third signal to the controller to sending a fourth signal to the controller before being turned on, and the third signal is different from the fourth signal; The controller is configured to control the output voltage of the inverter of the m uninterruptible power supplies to decrease when the third signal is switched to the fourth signal, so that after the main circuit of the at least one uninterruptible power supply is connected to the first bus and the second bus, the voltage output by the m uninterruptible power supplies to the second bus remains stable; or In at least one of the n uninterruptible power supplies, the main switch and the output switch are in an off state; in a process in which the main circuit of the at least one uninterruptible power supply is connected to the first bus and the second bus, in a process in which the main switch and the output switch are switched from an off state to an on state, at least one of the main switch and the output switch is used to switch from sending a third signal to the controller to sending a fourth signal to the controller before being switched on, and the third signal is different from the fourth signal; The controller is used to control the output voltage of the inverter of the m uninterruptible power supplies to decrease when the third signal is switched to the fourth signal, so that after the main circuit of at least one uninterruptible power supply is connected to the first bus and the second bus, the voltage output by the m uninterruptible power supplies to the second bus remains stable.

5. The power supply and distribution system according to claim 4, characterized in that: The switch that sends the third signal and the fourth signal to the controller is a first circuit breaker, and the first circuit breaker includes a housing, an operating handle, a moving contact assembly, a static contact and a first micro switch, wherein: The operating handle, the moving contact assembly, the static contact and the first micro switch are located in the housing, and the operating handle extends out of the housing; the moving contact assembly comprises a main shaft and a rotating rod, and the main shaft and the rotating rod are respectively connected to the housing for rotation; the operating handle is connected to the main shaft for transmission; one end of the rotating rod is arranged close to the main shaft, and the other end of the rotating rod extends in a direction away from the operating handle and is provided with a moving contact, and the moving contact is used to contact or separate with the static contact; The operating handle is used to drive the main shaft to rotate, and the main shaft is provided with a boss, and the boss is used to drive the rotating rod to rotate so as to separate the moving contact from the static contact; The main shaft is also provided with a lever, and the lever is used to turn on or off the first micro switch; When the first circuit breaker is in an open state, the moving contact is separated from the static contact, the boss is in contact with the rotating rod, and the lever presses the first microswitch, so that the first microswitch is turned on and sends the third signal to the controller; when the first circuit breaker is switched from an open state to a closed state, the operating handle drives the main shaft to rotate, so that the lever moves in a direction away from the first microswitch, and the rotating rod rotates toward the static contact, so that before the moving contact contacts the static contact, the first microswitch is disconnected and sends the fourth signal; when the first circuit breaker is in a closed state, the moving contact is in contact with the static contact, and the first microswitch is used to send the fourth signal to the controller.

6. The power supply and distribution system according to any one of claims 1 to 3, characterized in that: The power supply and distribution system comprises N uninterruptible power supplies, where N is a positive integer greater than 1; the main circuits of the N uninterruptible power supplies are respectively connected to the first bus and the second bus; In the process of disconnecting the main circuits of M uninterruptible power supplies among the N uninterruptible power supplies from the first bus and the second bus, one of the main switches and the output switches of the M uninterruptible power supplies is disconnected first, and the one is used to switch from sending a fourth signal to the controller to sending a third signal to the controller before disconnection, the third signal is different from the fourth signal, and M is a positive integer greater than or equal to 1, and M is less than N; The controller is used for controlling the output voltage of the inverter of the remaining uninterruptible power supplies among the N uninterruptible power supplies to increase when the fourth signal is switched to the third signal, so that after the main circuits of the M uninterruptible power supplies are disconnected from the first bus and the second bus, the voltage output by the remaining uninterruptible power supplies to the second bus remains stable; or In the process of disconnecting the main circuits of M uninterruptible power supplies among the N uninterruptible power supplies from the first bus and the second bus, the main switches and the output switches of the M uninterruptible power supplies are disconnected at the same time, and before being disconnected, the main switches and the output switches switch from sending a fourth signal to the controller to sending a third signal to the controller, the third signal is different from the fourth signal, and M is a positive integer greater than or equal to 1, and M is less than N; The controller is used to control the output voltage of the inverter of the remaining uninterruptible power supplies among the N uninterruptible power supplies to increase when the fourth signal is switched to the third signal, so that after the main circuits of the M uninterruptible power supplies are disconnected from the first bus and the second bus, the voltage output by the remaining uninterruptible power supplies to the second bus remains stable.

7. The power supply and distribution system according to claim 6, characterized in that: The switch that sends the third signal and the fourth signal to the controller is a second circuit breaker, and the second circuit breaker includes a housing, an operating handle, a moving contact assembly, a static contact, and a second micro switch, wherein: The operating handle, the moving contact assembly, the static contact and the second micro switch are located in the housing, and the operating handle extends out of the housing; the moving contact assembly comprises a main shaft and a rotating rod, and the main shaft and the rotating rod are respectively connected to the housing for rotation; the operating handle is connected to the main shaft for transmission; one end of the rotating rod is arranged close to the main shaft, and the other end of the rotating rod extends in a direction away from the operating handle and is provided with a moving contact, and the moving contact is used to contact or separate with the static contact; The operating handle is used to drive the main shaft to rotate, and the main shaft is provided with a boss, and the boss is used to drive the rotating rod to rotate so as to separate the moving contact from the static contact; The main shaft is also provided with a lever, and the lever is used to turn on or off the second micro switch; When the second circuit breaker is in a closed state, the moving contact contacts the static contact, the boss is spaced a set distance from the rotating rod, and the lever presses the second microswitch, so that the second microswitch is turned on and is used to send the fourth signal to the controller; when the second circuit breaker is switched from a closed state to an open state, the operating handle drives the main shaft to rotate, so that the lever moves in a direction away from the second microswitch, and the boss moves toward the rotating rod, so that before the boss contacts the rotating rod, the second microswitch is disconnected and sends the third signal; when the second circuit breaker is in an open state, the moving contact is separated from the static contact, and the second microswitch is used to send the third signal to the controller.

8. The power supply and distribution system according to any one of claims 1 to 3, characterized in that: The maintenance bypass switch is a third circuit breaker, and the third circuit breaker includes a housing, an operating handle, a moving contact assembly, a static contact and a third micro switch, wherein: The operating handle, the moving contact assembly, the static contact and the third micro switch are located in the housing, and the operating handle extends out of the housing; the moving contact assembly includes a main shaft and a rotating rod, and the main shaft and the rotating rod are respectively connected to the housing for rotation; the operating handle is connected to the main shaft for transmission; one end of the rotating rod is arranged close to the main shaft, and the other end of the rotating rod extends in a direction away from the operating handle and is provided with a moving contact, and the moving contact is used to contact or separate with the static contact; The operating handle is used to drive the main shaft to rotate, and the main shaft is provided with a boss, and the boss is used to drive the rotating rod to rotate so as to separate the moving contact from the static contact; The main shaft is also provided with a lever, and the lever is used to turn on or off the third micro switch; When the third circuit breaker is in an open state, the moving contact is separated from the static contact, the boss is in contact with the rotating rod, and the lever presses the third microswitch, so that the third microswitch is turned on and sends the first signal to the controller; when the third circuit breaker is switched from an open state to a closed state, the operating handle drives the main shaft to rotate, so that the lever moves in a direction away from the third microswitch, and the rotating rod rotates toward the static contact, so that before the moving contact contacts the static contact, the third microswitch is disconnected and sends the second signal; when the third circuit breaker is in a closed state, the moving contact is in contact with the static contact, and the third microswitch is used to send the first signal to the controller.

9. A power supply and distribution system, characterized in that: It includes a first bus, a second bus, a controller and a plurality of uninterruptible power supplies, wherein: The first busbar is electrically connected to the power grid, and the second busbar is electrically connected to the load; Among the multiple uninterruptible power supplies, each uninterruptible power supply includes a main circuit, a bypass circuit and an output switch, the main circuit and the bypass circuit are respectively connected to the first bus, the main circuit and the bypass circuit are connected in parallel and then connected in series with the output switch, and the output switch is connected to the second bus; the main circuit includes a main switch and an inverter connected in series, the main switch is connected to the first bus, and the inverter is connected to the output switch; the bypass circuit includes a bypass switch, one end of the bypass switch is connected to the first bus, and the other end is connected to the output switch; The main switch and the output switch are used to turn on and off the main circuit, and the bypass switch and the output switch are used to turn on and off the bypass circuit; the output switch, the main switch and the bypass switch are electrically connected to the controller respectively; The controller is used to control the output switch, the main switch and the bypass switch to be turned on or off, so as to control only one of the main circuit and the bypass circuit to be connected to the first bus and the second bus to form a loop; In the process of the output switch switching from the off state to the on state, the output switch is used to switch from sending a third signal to the controller to sending a fourth signal to the controller before switching on, and the third signal is different from the fourth signal; in the process of the output switch switching from the on state to the off state, the output switch is used to switch from sending the fourth signal to the controller to sending the third signal to the controller before switching off; the controller is used to control the inverters of the multiple uninterruptible power supplies to adjust the output voltage before the output switch is turned on or off when the third signal is switched to the fourth signal or when the fourth signal is switched to the third signal, so as to keep the voltage output by the multiple uninterruptible power supplies to the second bus stable.

10. The power supply and distribution system according to claim 9, characterized in that: The power supply and distribution system comprises m uninterruptible power supplies and n uninterruptible power supplies, wherein m and n are respectively positive integers greater than or equal to 1; the main circuits of the m uninterruptible power supplies are respectively connected to the first bus and the second bus, and the main circuits of the n uninterruptible power supplies are not connected to the first bus and the second bus; In at least one of the n uninterruptible power supplies, the main switch is in an on state, and the output switch is in an off state; in the process of connecting the main circuit of the at least one uninterruptible power supply to the first bus and the second bus, in the process of switching the output switch from an off state to an on state, the output switch is used to switch from sending the third signal to the controller to sending the fourth signal to the controller before being turned on; The controller is configured to control the output voltage of the inverter of the m uninterruptible power supplies to decrease when the third signal is switched to the fourth signal, so that after the main circuit of the at least one uninterruptible power supply is connected to the first bus and the second bus, the voltage output by the m uninterruptible power supplies to the second bus remains stable; or In at least one of the n uninterruptible power supplies, the main switch and the output switch are in an off state; in a process in which the main circuit of the at least one uninterruptible power supply is connected to the first bus and the second bus, in a process in which the main switch and the output switch are simultaneously switched from an off state to an on state, the output switch is used to switch from sending the third signal to the controller to sending the fourth signal to the controller before being switched on; The controller is used to control the output voltage of the inverter of the m uninterruptible power supplies to decrease when the third signal is switched to the fourth signal, so that after the main circuit of at least one uninterruptible power supply is connected to the first bus and the second bus, the voltage output by the m uninterruptible power supplies to the second bus remains stable.

11. The power supply and distribution system according to claim 9, characterized in that: The power supply and distribution system comprises N uninterruptible power supplies, where N is a positive integer greater than 1; the main circuits of the N uninterruptible power supplies are respectively connected to the first bus and the second bus; In the process of disconnecting the main circuits of M uninterruptible power supplies among the N uninterruptible power supplies from the first bus and the second bus, the output switches of the M uninterruptible power supplies are disconnected first, and the output switches are used to switch from sending the fourth signal to the controller to sending the third signal to the controller before disconnection, where M is a positive integer greater than or equal to 1, and M is less than N; The controller is used for controlling the output voltage of the inverter of the remaining uninterruptible power supplies among the N uninterruptible power supplies to increase when the fourth signal is switched to the third signal, so that after the main circuits of the M uninterruptible power supplies are disconnected from the first bus and the second bus, the voltage output by the remaining uninterruptible power supplies to the second bus remains stable; or In the process of disconnecting the main circuits of M uninterruptible power supplies among the N uninterruptible power supplies from the first bus and the second bus, the main switches and the output switches of the M uninterruptible power supplies are disconnected at the same time, and before disconnecting, the output switch switches from sending the fourth signal to the controller to sending the third signal to the controller, where M is a positive integer greater than or equal to 1, and M is less than N; The controller is used to control the output voltage of the inverter of the remaining uninterruptible power supplies among the N uninterruptible power supplies to increase when the fourth signal is switched to the third signal, so that after the main circuits of the M uninterruptible power supplies are disconnected from the first bus and the second bus, the voltage output by the remaining uninterruptible power supplies to the second bus remains stable.

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