Power module and method for preventing over-reach tripping

Abstract

The application provides a power module and a method for preventing overstep tripping. In the power module, an incoming line switch controls the conduction or shutdown between an input power source and each uninterruptible power supply in at least two uninterruptible power supplies, and a feeder switch controls the conduction or shutdown between the output of each uninterruptible power supply and the output of the power module. Each uninterruptible power supply comprises a main circuit, a bypass circuit and an output switch, wherein the main circuit is provided with a main circuit input switch and a power converter, and the bypass circuit is provided with a bypass input switch. When the output line of the feeder switch is short-circuited, a first controller controls the feeder switch to be turned off, and sends a first fault signal to a second controller. The second controller controls the bypass input switch and the output switch in each uninterruptible power supply to be turned on in response to the first fault signal. Based on the application, the bypass input switch and the output switch in each uninterruptible power supply can be prevented from overstep tripping, thereby improving the power supply reliability of the power module.

Description

Technical Field

[0001] This application relates to the field of power supply, and more particularly to a power module and method for preventing over-level tripping. Background Technology

[0002] With the rise of artificial intelligence, cloud computing, industrial IoT, and 6G (sixth-generation wireless systems), data centers are increasingly demanding massive data storage and cloud access, placing higher requirements on their power supply systems. Power modules, with their advantages of low energy consumption, small footprint, short delivery cycles, and ease of maintenance, are commonly used as the power supply system for data centers.

[0003] Currently, a power module is a power device that integrates a transformer, input cabinet, reactive power compensation device, uninterruptible power supply (UPS), and output feeder cabinet. It integrates functions such as voltage conversion, harmonic mitigation, backup power, electrical protection, and feeder functions to provide reliable power to data centers. When a short circuit fault occurs in the downstream line of one of the switches within the power module, not only does that switch trip, but the upstream switch also trips—a situation of cascading tripping. This expands the fault range and reduces the power supply reliability of the power module. Therefore, reducing the problem of cascading tripping of switches within power modules is particularly important. Summary of the Invention

[0004] This application provides a power module and a method for preventing over-level tripping, which can prevent the switch in the power module from tripping over-level, thereby improving the power supply reliability of the power module.

[0005] In a first aspect, embodiments of this application provide a power module with anti-overcurrent tripping capability. The power module includes an input switch, at least two uninterruptible power supplies (UPS), a feeder switch, a first controller, and a second controller. The input switch controls the connection or disconnection between the input power supply and the input terminal of each of the at least two UPS. The feeder switch controls the connection or disconnection between the output terminal of each UPS and the output terminal of the power module. Each UPS includes a main circuit, a bypass circuit, and an output switch. The main circuit includes a main circuit input switch and a power converter, which controls the connection or disconnection between the input terminal of each UPS and the input terminal of the power converter. The bypass circuit includes a bypass input switch, which controls the connection or disconnection between the input terminal of each UPS and the output terminal of the power converter. The output switch controls the connection or disconnection between the output terminal of the power converter and the output terminal of each UPS. When the output line of the feeder switch is short-circuited, it indicates that a short-circuit fault has occurred in the output line of the feeder switch. At this time, the first controller controls the feeder switch to open and sends a first fault signal to the second controller. Further, the second controller, in response to the first fault signal, controls the bypass input switch and output switch in each uninterruptible power supply (UPS) to turn on. It can be understood that during a short circuit in the output line of the feeder switch, even if the short-circuit current on the output line is greater than or equal to the tripping current of the bypass input switch and output switch in each UPS, the bypass input switch and output switch in each UPS will remain on and not turn off (i.e., will not trip). By implementing the embodiments of this application, when a short circuit fault occurs in the output line of the feeder switch, the bypass input switch and output switch in each UPS can be prevented from tripping beyond their designated level, thereby improving the power supply reliability of the power module.

[0006] In one possible implementation, where the power module also includes a third controller, when the second controller receives a first fault signal indicating that the output lines of both the bypass input switches and output switches in each uninterruptible power supply (UPS) are short-circuited, and the current flowing through the output switches in at least two UPSs is in the same direction, it indicates that a short-circuit fault has occurred in the output line of the feeder switch. At this time, the second controller is also used to send a second fault signal to the third controller. Further, the third controller is used to control the incoming line switch to conduct in response to the second fault signal. It is understood that during a short circuit in the output line of the feeder switch, even if the short-circuit current on the output line is greater than or equal to the tripping current of the incoming line switch, the incoming line switch will remain in the conducting state and will not disconnect (i.e., it will not trip). By implementing the embodiments of this application, when a short-circuit fault occurs in the output line of the feeder switch, the situation of the incoming line switch tripping beyond its designated level can be avoided, thereby improving the power supply reliability of the power module.

[0007] In one possible implementation, where the power module also includes a third controller, a short-circuit fault can be indicated when the second controller does not receive a first fault signal, the output lines of the bypass input switches and output switches in each uninterruptible power supply (UPS) are short-circuited, and the current flowing through the output switches in at least two UPSs is in the same direction. In this case, the second controller controls the output switches in each UPS to open and the bypass input switches in each UPS to close, sending a third fault signal to the third controller. Further, the third controller responds to the third fault signal by controlling the incoming line switch to close. It is understood that during the short-circuit process of the output lines of the output switches in each UPS, even if the short-circuit current on the output lines is greater than or equal to the tripping current of the incoming line switch and the bypass input switch in each UPS, the incoming line switch and the bypass input switch in each UPS will remain in the closed state (i.e., not trip). By implementing the embodiments of this application, when a short-circuit fault occurs in the output line of the output switch in each uninterruptible power supply, the situation of over-tripping of the incoming switch and the bypass input switch in each uninterruptible power supply can be avoided, thereby improving the power supply reliability of the power module.

[0008] In one possible implementation, where the power module also includes a third controller, when the output lines of the bypass input switches and output switches in each uninterruptible power supply (UPS) are both short-circuited, and the direction of the current flowing through the output switches of any one of the UPS is different from the direction of the current flowing through the output switches of the other UPS, it can be indicated that a short-circuit fault has occurred in the output line of any UPS (i.e., the line between the output switch and the output terminal of the power converter), meaning a short-circuit fault has occurred in the internal circuit of any UPS. At this time, the second controller controls the bypass input switches and output switches in any UPS to open, and controls the bypass input switches and output switches in the other UPS to close, sending a fourth fault signal to the third controller. Further, the third controller, in response to the fourth fault signal, controls the incoming line switch to close. It is understood that during a short circuit in the output line of any uninterruptible power supply (UPS), even if the short-circuit current on the output line is greater than or equal to the tripping current of the incoming line switch and the bypass input and output switches in other UPSs, the incoming line switch and the bypass input and output switches in other UPSs will remain in a conducting state and will not trip (i.e., will not trip). By implementing the embodiments of this application, when a short circuit fault occurs in the internal circuit of any UPS, the situation of cascading tripping of the incoming line switch and the bypass input and output switches in other UPSs can be avoided, thereby improving the power supply reliability of the power module.

[0009] In one possible implementation, where the power module also includes a third controller, a short circuit in the output line of one of the main input switches and bypass input switches in each uninterruptible power supply (UPS) indicates a short circuit fault in the output line of one of the input switches. At this time, the second controller controls one of the input switches in each UPS to disconnect and sends a fifth fault signal to the third controller. Further, the third controller responds to the fifth fault signal by controlling the incoming line switch to turn on. It is understood that during a short circuit in the output line of one of the input switches in each UPS, even if the short-circuit current on the output line is greater than or equal to the tripping current of the incoming line switch, the incoming line switch will remain on and not disconnect (i.e., it will not trip). By implementing the embodiments of this application, when a short circuit fault occurs in the output line of one of the input switches in each UPS, the incoming line switch can avoid cascading tripping, thereby improving the power supply reliability of the power module.

[0010] In one possible implementation, the power module further includes a reactive power compensation input switch and a reactive power compensation unit. The incoming line switch is also used to control the connection or disconnection between the input power supply and the reactive power compensation input switch. The reactive power compensation input switch controls the connection or disconnection between the incoming line switch and the reactive power compensation unit. If the power module also includes a third controller, a short circuit in the output line of the reactive power compensation input switch indicates a short circuit fault. At this time, the second controller controls the reactive power compensation input switch to disconnect and sends a sixth fault signal to the third controller. Further, the third controller responds to the sixth fault signal by controlling the incoming line switch to connect. It is understood that during a short circuit in the output line of the reactive power compensation input switch, even if the short circuit current on the output line is greater than or equal to the tripping current of the incoming line switch, the incoming line switch will remain connected and not disconnect (i.e., it will not trip). By implementing the embodiments of this application, when a short circuit fault occurs in the output line of the reactive power compensation input switch, the situation of the incoming line switch tripping beyond its rated capacity can be avoided, thereby improving the power supply reliability of the power module.

[0011] Secondly, embodiments of this application provide a method for preventing over-circuit tripping. In this method, when the output line of a feeder switch is short-circuited, a first controller controls the feeder switch to open and sends a first fault signal to a second controller. The feeder switch controls the connection or disconnection between the output terminal of each of at least two uninterruptible power supplies (UPS) and the output terminal of the power module. Further, in response to the first fault signal, the second controller controls the bypass input switch and output switch of each UPS to open. Each UPS includes a main circuit, a bypass circuit, and an output switch. The main circuit is equipped with a main circuit input switch and a power converter. The main circuit input switch controls the connection or disconnection between the input terminal of each UPS and the input terminal of the power converter. The bypass circuit is equipped with a bypass input switch, which controls the connection or disconnection between the input terminal of each UPS and the output terminal of the power converter. The output switch controls the connection or disconnection between the output terminal of the power converter and the output terminal of each UPS. By implementing the embodiments of this application, when a short circuit fault occurs in the output line of the feeder switch, the bypass input switch and output switch in each uninterruptible power supply can be prevented from tripping out of their respective stages, thereby improving the power supply reliability of the power module.

[0012] In one possible implementation, when the second controller receives a first fault signal, indicating that the output lines of the bypass input switches and output switches in each uninterruptible power supply (UPS) are short-circuited, and the current flowing through the output switches of at least two UPSs is in the same direction, the second controller sends a second fault signal to the third controller. Further, in response to the second fault signal, the third controller controls the incoming line switch to turn on. The incoming line switch controls the connection or disconnection between the input power supply and the input terminal of each UPS. By implementing this embodiment, when a short-circuit fault occurs in the output line of the feeder switch, the incoming line switch can be prevented from tripping prematurely, thereby improving the power supply reliability of the power module.

[0013] In one possible implementation, when the second controller does not receive the first fault signal, the output lines of the bypass input switches and output switches in each uninterruptible power supply (UPS) are short-circuited, and the current flowing through the output switches in at least two UPSs is in the same direction, the second controller controls the output switches in each UPS to open and controls the bypass input switches in each UPS to close, sending a third fault signal to the third controller. Further, in response to the third fault signal, the third controller controls the incoming line switch to close. The incoming line switch controls the connection or disconnection between the input power supply and the input terminal of each UPS. By implementing this embodiment, when a short-circuit fault occurs in the output line of the output switch in each UPS (i.e., the line between the output switch and the feeder switch in each UPS), the cascading tripping of the incoming line switch and the bypass input switch in each UPS can be avoided, thereby improving the power supply reliability of the power module.

[0014] In one possible implementation, when the output lines of the bypass input switches and output switches in each uninterruptible power supply (UPS) are both short-circuited, and the current direction flowing through the output switches of at least two UPSs differs from the current direction flowing through the output switches of the other UPSs, the second controller controls the bypass input switches and output switches of the one UPS to disconnect, and controls the bypass input switches and output switches of the other UPSs to turn on, sending a fourth fault signal to the third controller. Further, in response to the fourth fault signal, the third controller controls the incoming line switch to turn on. The incoming line switch controls the connection or disconnection between the input power supply and the input terminal of each UPS. Implementing this embodiment, when a short-circuit fault occurs in the output line of the output switch in any UPS (i.e., the line between the output switch and the output terminal of the power converter), i.e., a short-circuit fault occurs within any UPS, the incoming line switch and the bypass input switches and output switches of the other UPSs can be prevented from tripping out of their respective stages, thereby improving the power supply reliability of the power module.

[0015] In one possible implementation, when the output line of one of the main input switches and bypass input switches in each uninterruptible power supply (UPS) is short-circuited, the second controller controls one of the input switches in each UPS to disconnect and sends a fifth fault signal to the third controller. Further, in response to the fifth fault signal, the third controller controls the incoming line switch to turn on. The incoming line switch controls the connection or disconnection between the input power supply and the input terminal of each UPS. By implementing this embodiment, when a short-circuit fault occurs in the output line of one of the input switches in each UPS, the incoming line switch can be prevented from tripping prematurely, thereby improving the power supply reliability of the power module.

[0016] In one possible implementation, when a short circuit occurs in the output line of the reactive power compensation input switch, the second controller controls the reactive power compensation input switch to disconnect and sends a sixth fault signal to the third controller. The reactive power compensation input switch controls the connection or disconnection between the incoming line switch and the reactive power compensation unit. Further, in response to the sixth fault signal, the third controller controls the incoming line switch to connect. The incoming line switch controls the connection or disconnection between the input power supply and the reactive power compensation input switch. By implementing this embodiment, when a short circuit fault occurs in the output line of the reactive power compensation input switch, the cascading tripping of the incoming line switch can be avoided, thereby improving the power supply reliability of the power module.

[0017] It should be understood that the implementation and beneficial effects of the above-mentioned aspects of the embodiments of this application can be referred to each other. Attached Figure Description

[0018] Figure 1 This is a schematic diagram illustrating an application scenario of the power module provided in this application embodiment;

[0019] Figure 2 This is a circuit diagram of a power module for preventing over-level tripping provided in an embodiment of this application;

[0020] Figure 3 This is a schematic diagram showing the flow of short-circuit current inside the power module when a short-circuit fault occurs in the output line of the feeder switch provided in this application embodiment;

[0021] Figure 4 This is a schematic diagram showing the flow of short-circuit current inside the power module when a short-circuit fault occurs in the output line of the output switch in each uninterruptible power supply provided in this application embodiment;

[0022] Figure 5 This is a schematic diagram showing the flow of short-circuit current inside the power module when a short-circuit fault occurs in any of the uninterruptible power supplies provided in this application embodiment.

[0023] Figure 6This is a schematic diagram showing the flow of short-circuit current inside the power module when a short-circuit fault occurs in the output line of the main input switch in each uninterruptible power supply provided in this application embodiment;

[0024] Figure 7 This is a schematic diagram of the short-circuit current flow inside the power module when a short-circuit fault occurs in the output line of the bypass input switch in each uninterruptible power supply provided in this application embodiment;

[0025] Figure 8 This is another circuit diagram of the power module for preventing over-level tripping provided in the embodiments of this application;

[0026] Figure 9 This is a schematic diagram of the short-circuit current flow inside the power module when a short-circuit fault occurs in the output line of the reactive power compensation input switch provided in this application embodiment;

[0027] Figure 10 This is a schematic diagram showing the flow of short-circuit current inside the power module when a short-circuit fault occurs in the output line of the incoming switch provided in this application embodiment;

[0028] Figure 11 This is a circuit diagram of the power module output terminal connected to the load via a switch, provided in an embodiment of this application.

[0029] Figure 12 This is another circuit diagram of the power module for preventing over-level tripping provided in the embodiments of this application;

[0030] Figure 13 This is a flowchart illustrating the method for preventing over-level tripping provided in an embodiment of this application. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] The implementation of the technical solution of this application will be further described in detail below with reference to the accompanying drawings.

[0033] See Figure 1 , Figure 1 This is a schematic diagram illustrating an application scenario of the power module provided in an embodiment of this application. For example... Figure 1As shown, power module 12 is connected between AC power grid 11 and load 13. Power module 12 is used to convert the AC power output from AC power grid 11 and supply power to load 13. For example, load 13 includes at least one of internet technology (IT) equipment and power equipment. The IT equipment may include computers, servers, network equipment, and switches, while the power equipment may include indirect evaporative cooling systems and chilled water air conditioning terminal equipment. Specifically, power module 12 includes a transformer, an incoming line switch, uninterruptible power supplies (UPS) 1 to UPS n, a feeder switch, a first controller, and a second controller. Each UPS 1 to UPS n includes a main circuit, a bypass circuit, and an output switch. The main circuit is equipped with a main circuit input switch and a power converter, and the bypass circuit is equipped with a bypass input switch. When power module 12 receives AC power, the transformer converts the AC power output from AC power grid 11 into a first AC power, which is then output to UPS 1 to UPS n via the incoming line switch. Furthermore, the second controller is used to control the main input switch and output switch of each uninterruptible power supply to be turned on and the bypass input switch to be turned off, and to control the power converter in each uninterruptible power supply to convert the first AC power and output the second AC power. Further still, the first controller is used to control the feeder switch to be turned on, so as to output the second AC power output by each uninterruptible power supply to the load 13 for power supply. During the process of power module 12 supplying power to load 13, when the output line of the feeder switch is short-circuited, it can indicate that a short-circuit fault has occurred in the output line of the feeder switch. At this time, the first controller is used to control the feeder switch to be turned off and send a first fault signal to the second controller. Further still, the second controller is used to control the bypass input switch and output switch of each uninterruptible power supply to be turned on in response to the first fault signal. By implementing the embodiments of this application, when a short-circuit fault occurs in the output line of the feeder switch, the bypass input switch and output switch can be prevented from tripping (i.e., the bypass input switch and output switch are turned off), thereby improving the power supply reliability of power module 12.

[0034] The following will combine Figures 2 to 12 The power module provided in this application and its working principle are illustrated with examples.

[0035] See Figure 2 , Figure 2 This is a circuit diagram of a power module for preventing over-level tripping provided in an embodiment of this application. For example... Figure 2As shown, the power module 2 includes an input switch Q11, uninterruptible power supplies (UPS) 21a, UPS 21b, ..., UPS 21n, a feeder switch Q21, a first controller 22, and a second controller 23. The input switch Q11 is connected between the input power supply 31 and the input terminals of each UPS 21a to UPS 21n, and is used to control the connection or disconnection between the input power supply 31 and the input terminals of each UPS. The feeder switch Q21 is connected between the output terminal of each UPS and the output terminal out31 of the power module, and is used to control the connection or disconnection between the output terminal of each UPS and the output terminal out31 of the power module. Each UPS includes a main circuit, a bypass circuit, and an output switch. The main circuit includes a main circuit input switch and a power converter, and the main circuit input switch controls the connection or disconnection between the input terminal of each UPS and the input terminal of the power converter. The aforementioned bypass is equipped with a bypass input switch, which controls the connection or disconnection between the input terminal of each uninterruptible power supply and the output terminal of the power converter. The aforementioned output switch controls the connection or disconnection between the output terminal of the power converter and the output terminal of each uninterruptible power supply.

[0036] For example, the uninterruptible power supply 21a includes a main circuit 211a, a bypass circuit 212a, and an output switch Q51. The main circuit 211a is equipped with a main circuit input switch Q31 and a power converter 2111a. The main circuit input switch Q31 is connected between the input terminal in1 of the uninterruptible power supply 21a and the input terminal in2 of the power converter 2111a. The main circuit input switch Q31 controls the connection or disconnection between the input terminal in1 of the uninterruptible power supply 21a and the input terminal in2 of the power converter 2111a. The bypass circuit 212a is equipped with a bypass input switch Q41, which is connected between the input terminal in1 of the uninterruptible power supply 21a and the output terminal out2 of the power converter 2111a. The bypass input switch Q41 controls the connection or disconnection between the input terminal in1 of the uninterruptible power supply 21a and the output terminal out2 of the power converter 2111a. The aforementioned output switch Q51 is connected between the output terminal out2 of the power converter 2111a and the output terminal out1 of the uninterruptible power supply 21a, and is used to control the conduction or disconnection between the output terminal out2 of the power converter 2111a and the output terminal out1 of the uninterruptible power supply 21a. The aforementioned uninterruptible power supply 21b includes a main circuit 211b, a bypass circuit 212b, and an output switch Q52. The main circuit 211b is equipped with a main circuit input switch Q32 and a power converter 2111b, the bypass circuit 212b is equipped with a bypass input switch Q42, and so on. The aforementioned uninterruptible power supply 21n includes a main circuit 211n, a bypass circuit 212n, and an output switch Q5n. The main circuit 211n is equipped with a main circuit input switch Q3n and a power converter 2111n, the bypass circuit 212n is equipped with a bypass input switch Q4n. It is understood that the circuit connection relationships and functions between the various devices in each uninterruptible power supply 21b to 21n can be found in the circuit connection relationships and functions between the various devices in uninterruptible power supply 21a, and will not be repeated here.

[0037] The first controller 22 is used to detect the voltage and current on the output line of the feeder switch Q21 in real time, thereby determining whether the output line of the feeder switch Q21 is short-circuited. Specifically, the first controller 22 is used to determine the voltage slope, effective voltage value, current slope, and effective current value of the output line of the feeder switch Q21 based on the voltage and current on the output line of the feeder switch Q21. For example, when the input power supply 31 outputs single-phase AC power, the output line of the feeder switch Q21 includes a live wire and a neutral wire. The voltage on the output line includes the voltage between the live wire and the neutral wire, the voltage between the live wire and the reference ground, and the voltage between the neutral wire and the reference ground; each type of voltage corresponds to a voltage slope and an effective voltage value. The current on the output line includes the current flowing through the live wire and the current flowing through the neutral wire; each type of current corresponds to a current slope and an effective current value. For example, when the input power supply 31 outputs three-phase AC power, the output line of the feeder switch Q21 includes three live wires and one neutral wire. The voltage on the output line includes the voltage between each of the three live wires and the neutral wire, the voltage between any two of the three live wires, the voltage between each live wire and the reference ground, and the voltage between the neutral wire and the reference ground. Each voltage corresponds to a voltage slope and an effective voltage value. The current on the output line includes the current flowing through each live wire and the current flowing through the neutral wire. Each current corresponds to a current slope and an effective current value. Further, the first controller 22 is also used to determine that the output line of the feeder switch Q21 is short-circuited when at least one of the parameters of the voltage slope, effective voltage value, current slope, and effective current value of the output line of the feeder switch Q21 is greater than or equal to a corresponding preset value. One of the at least one parameters corresponds to a preset value, which can be specifically determined by the electronic components inside the power module 2, and is not limited here.

[0038] The first controller 22 and the second controller 23 can communicate via wired or wireless means to send or receive data (such as the first fault signal described below). The wired or wireless communication method can be a fast communication method at the millisecond (ms) level, such as Fast Ethernet or StarFlash communication. The first controller 22 is used to control the feeder switch Q21 to open and send the first fault signal to the second controller 23 when the output line of the feeder switch Q21 is short-circuited. Further, the second controller 23 is used to control the bypass input switch and output switch in each uninterruptible power supply to be turned on in response to the first fault signal. It can be understood that when the output line A of the feeder switch Q21 is short-circuited, it indicates that a short-circuit fault has occurred in the output line A of the feeder switch Q21. At this time, the flow direction of the short-circuit current inside the power module 2 can be as follows... Figure 3As shown, uninterruptible power supplies 21a, 21b, ..., 21n will switch from the main circuit to the bypass circuit within a certain time (e.g., a few milliseconds), forming short-circuit paths a, b, ..., c within the power module 2. A short-circuit path can be understood as a path where the output lines of all switches are short-circuited. For example, the output lines of incoming switch Q11, bypass input switch Q41, output switch Q51, and feeder switch Q21 on short-circuit path a are all short-circuited; the output lines of incoming switch Q11, bypass input switch Q42, output switch Q52, and feeder switch Q21 on short-circuit path b are all short-circuited; ..., the output lines of incoming switch Q11, bypass input switch Q4n, output switch Q5n, and feeder switch Q21 on short-circuit path c are all short-circuited. During a short circuit in output line A of feeder switch Q21, even if the short-circuit current along short-circuit path a to short-circuit path c is greater than or equal to the tripping current of the bypass input and output switches in each uninterruptible power supply (UPS), the bypass input and output switches in each UPS will remain in the conducting state and will not trip (i.e., will not trip). By implementing the embodiments of this application, when a short-circuit fault occurs in output line A of feeder switch Q21, the bypass input and output switches in each UPS can be prevented from tripping beyond their designated levels, thereby improving the power supply reliability of power module 2.

[0039] In some feasible implementations, such as Figure 2As shown, the power module 2 also includes a third controller 24. The third controller 24 and the second controller 23 can communicate via wired or wireless means to send or receive data (such as the second fault signal described below). The second controller 23 is used to detect the voltage and current on the output lines of the switches in each uninterruptible power supply (UPS) in real time, thereby determining whether the output lines of the switches in each UPS are short-circuited. The specific process can be found in the description above regarding the first controller 22 determining whether the output line of the feeder switch Q21 is short-circuited, and will not be repeated here. Each UPS includes a main input switch, a bypass input switch, and an output switch. The second controller 23 is also used to send a second fault signal to the third controller 24 when it receives a first fault signal, and the output lines of both the bypass input switch and the output switch in each UPS are short-circuited, and the current flowing through the output switches in at least two UPSs is in the same direction. At this time, the third controller 24 responds to the second fault signal by controlling the incoming switch Q11 to turn on. It is understandable that during a short circuit in the output line A of feeder switch Q21, even if the short-circuit current along short-circuit path a to short-circuit path c is greater than or equal to the tripping current of incoming switch Q11, incoming switch Q11 will remain in the conducting state and will not trip (i.e., it will not trip). By implementing this embodiment, when a short circuit fault occurs in the output line A of feeder switch Q21, the situation of incoming switch Q11 tripping beyond its designated stage can be avoided, thereby improving the power supply reliability of power module 2. Furthermore, since the first controller 22, the second controller 23, and the third controller 24 each independently control their respective switches, a short circuit fault in one controller will not interfere with the other two controllers controlling the corresponding switches to turn on or off, resulting in higher control reliability of power module 2.

[0040] In some feasible implementations, the number of uninterruptible power supplies (UPS) inside the power module 2 can also be one. Taking the power module 2 as an example where only UPS 21a is included, the conditions under which the second controller 23 controls the corresponding switch to turn on and issues the second fault signal can be replaced by receiving the first fault signal, both the output lines of the bypass input switch Q41 and the output switch Q51 in UPS 21a being short-circuited, and the current flowing through the bypass input switch Q41 being in the same direction as the current flowing through the output switch Q51. Specifically, the current flowing through the bypass input switch Q41 and the current flowing through the output switch Q51 both flow from the input terminal in1 to the output terminal out1 of UPS 21a.

[0041] In some feasible implementations, the first controller 22 is further configured to output a first control signal to the feeder switch Q21 when the output line of the feeder switch Q21 is short-circuited. This first control signal controls the feeder switch Q21 to disconnect. After the feeder switch Q21 disconnects in response to the first control signal, it isolates the short-circuit faulty output line A. At this time, the output lines of the feeder switch Q21, the bypass input switches and output switches in each uninterruptible power supply, and the incoming switch Q11 are no longer short-circuited. The second controller 23 no longer needs to control the bypass input switches and output switches in each uninterruptible power supply to be on, and the third controller 24 no longer needs to control the incoming switch Q11 to be on. In other words, both the second controller 23 and the third controller 24 will release the control logic that prevents the corresponding switches from tripping. At this time, the bypass input switches and output switches in each uninterruptible power supply, as well as the incoming switch Q11, can be on or off. The specific switch states can be flexibly adjusted according to the actual application scenario and are not limited here.

[0042] In some feasible implementations, the first controller 22 is further configured to send a first tripping abnormality signal to the second controller 23 when the feeder switch Q21 receives the first control signal and fails to disconnect after a first preset time. The first preset time can be determined by the tripping time of the feeder switch Q21 and the switches in each uninterruptible power supply (UPS). For example, the first preset time can be 15ms. It is understood that when the feeder switch Q21 fails to disconnect after the first preset time, i.e., when the feeder switch Q21 trips abnormally, the output line A with the short-circuit fault cannot be properly isolated. At this time, the output lines of the feeder switch Q21, the bypass input switches and output switches in each UPS, and the input switch Q11 remain short-circuited. Further, the second controller 23 is configured to control the bypass input switches and output switches in each UPS to disconnect in response to the first tripping abnormality signal. The second controller 23 is configured to send a second tripping abnormality signal to the third controller 24 when it receives a first tripping abnormality signal, the output lines of the bypass input switches and output switches in each uninterruptible power supply are short-circuited, and the current flowing through the output switches in at least two uninterruptible power supplies is in the same direction. Furthermore, the third controller 24 is configured to control the incoming line switch Q11 to disconnect in response to the second tripping abnormality signal. By implementing this embodiment, when the feeder switch Q21 trips abnormally, the bypass input switches and output switches in each uninterruptible power supply, as well as the incoming line switch Q11, can be controlled to disconnect, thereby isolating the output line of the faulty feeder switch Q21 to avoid expanding the fault range, and thus improving the power supply reliability of the power module 2.

[0043] In some feasible implementations, any one of the following switches—the incoming line switch Q11, the switch in each uninterruptible power supply, and the feeder switch Q21—can be a circuit breaker, or a series disconnector and fuse. For example, the incoming line switch Q11 can be an air circuit breaker (ACB), the switch in each uninterruptible power supply can be a molded case circuit breaker (MCCB), and the feeder switch Q21 can be a micro circuit breaker (MCB). These are merely examples, and the embodiments of this application do not limit the type of any switch.

[0044] In some feasible implementations, each of the first controller 22 and the third controller 24 can exist independently outside the corresponding switch, or it can be integrated with the corresponding switch. The second controller 23 can exist independently outside the uninterruptible power supplies 21a to 21n, or it can be embedded inside the uninterruptible power supply. Taking the example of the second controller 23 being embedded inside the uninterruptible power supply, there can be multiple second controllers 23, each corresponding one-to-one with an uninterruptible power supply 21a to 21n, wherein each of the multiple second controllers 23 is embedded inside its corresponding uninterruptible power supply. This application does not limit the actual locations of the first controller 22, the second controller 23, and the third controller 24.

[0045] In some feasible implementations, the second controller 23 is used to control the output switch in each uninterruptible power supply to open and control the bypass input switch in each uninterruptible power supply to turn on when the first fault signal is not received, the output lines of the bypass input switches and output switches in each uninterruptible power supply are short-circuited, and the current flowing through the output switches in uninterruptible power supply 21a to 21n is in the same direction, and to send a third fault signal to the third controller 24. The output line of the output switch in each uninterruptible power supply is the line between the output switch and the feeder switch in each uninterruptible power supply. Further, the third controller 24 is used to control the input switch Q11 to turn on in response to the third fault signal. It can be understood that when the second controller 23 does not receive the first fault signal, i.e., when the output line of feeder switch Q21 is not short-circuited, it can be concluded that the output line of feeder switch Q21 is not a faulty line. Therefore, when the output lines of both the bypass input switch and the output switch in each uninterruptible power supply are short-circuited, and the current flowing through the output switches in uninterruptible power supplies 21a to 21n flows in the same direction, it indicates that a short-circuit fault has occurred in the output line B of the output switch in each uninterruptible power supply. At this time, the direction of the short-circuit current inside the power module 2 can be as follows: Figure 4 As shown, uninterruptible power supplies 21a, 21b, ..., 21n switch from the main circuit to the bypass circuit, forming short-circuit paths d, e, ..., f within the power module 2. For example, the output lines of the incoming switch Q11, bypass input switch Q41, and output switch Q51 on short-circuit path d are all short-circuited; the output lines of the incoming switch Q11, bypass input switch Q42, and output switch Q52 on short-circuit path e are all short-circuited; ..., the output lines of the incoming switch Q11, bypass input switch Q4n, and output switch Q5n on short-circuit path f are all short-circuited. During a short circuit in the output line B of the output switch in each uninterruptible power supply (UPS), even if the short-circuit current on the short-circuit path d to short-circuit path f is greater than or equal to the tripping current of the incoming switch Q11 and the bypass input switch in each UPS, the incoming switch Q11 and the bypass input switch in each UPS will remain in the conducting state and will not disconnect (i.e., will not trip). By implementing the embodiments of this application, when a short circuit fault occurs in the output line B of the output switch in each UPS, the situation of cascading tripping of the incoming switch Q11 and the bypass input switch in each UPS can be avoided, thereby improving the power supply reliability of the power module 2.

[0046] In some feasible implementations, the number of uninterruptible power supplies (UPS) inside the power module 2 can also be one. Taking the power module 2 as an example where only UPS 21a is included, the conditions under which the second controller 23 controls the corresponding switches to turn on or off and issues the third fault signal can be replaced by: not receiving the first fault signal, both the output lines of the bypass input switch Q41 and the output switch Q51 being short-circuited, and the current flowing through the bypass input switch Q41 and the current flowing through the output switch Q51 being in the same direction. Specifically, the current flowing through the bypass input switch Q41 and the current flowing through the output switch Q51 both flow from the input terminal in1 of the UPS 21a to the output terminal out1.

[0047] In some feasible implementations, the second controller 23 is configured to output a second control signal to the output switch of each uninterruptible power supply (UPS) when the first fault signal is not received, the output lines of the bypass input switches and the output switches in each UPS are short-circuited, and the current flowing through the output switches in UPS 21a to UPS 21n is in the same direction. The second control signal controls the output switches in each UPS to disconnect. After the output switches in each UPS disconnect in response to the second control signal, the short-circuit faulty output line B can be isolated. At this time, the output lines of the bypass input switches, output switches, and incoming switch Q11 in each UPS are no longer short-circuited. The second controller 23 no longer needs to control the bypass input switches in each UPS to be on, and the third controller 24 no longer needs to control the incoming switch Q11 to be on. In other words, both the second controller 23 and the third controller 24 will release the control logic that prevents the corresponding switches from tripping. At this time, the bypass input switch and the incoming switch Q11 in each uninterruptible power supply can be turned on or off. The specific switch state can be flexibly adjusted according to the actual application scenario, and no restrictions are imposed here.

[0048] In some feasible implementations, the second controller 23 is used to control the bypass input switch in each uninterruptible power supply to open and send a third tripping abnormality signal to the third controller 24 when the output switch in each uninterruptible power supply receives the second control signal and fails to open after a second preset time. The second preset time can be determined by the tripping time of the switch in each uninterruptible power supply; for example, the second preset time can be 20ms. It is understood that when the output switch in each uninterruptible power supply fails to open after the second preset time, i.e., when the output switch in each uninterruptible power supply trips abnormally, the output line B with the short-circuit fault cannot be properly isolated. At this time, the output lines of the bypass input switch, output switch, and incoming switch Q11 in each uninterruptible power supply remain short-circuited. Further, the third controller 24 is used to control the incoming switch Q11 to open in response to the third tripping abnormality signal. By implementing the embodiments of this application, when the output switch in each uninterruptible power supply trips abnormally, the bypass input switch and the incoming switch Q11 in each uninterruptible power supply can be controlled to disconnect, thereby isolating the faulty output line B to avoid expanding the scope of the fault, and thus improving the power supply reliability of the power module 2.

[0049] In some feasible implementations, the second controller 23 is configured to, in response to the fourth fault signal, control the bypass input switch and output switch of any uninterruptible power supply (UPS) to disconnect, and control the bypass input switches and output switches of the other UPS to turn on, when the output lines of both the bypass input switches and output switches in each UPS are short-circuited, and the current direction flowing through the output switches of any one of the UPSs 21a to 21n is different from the current direction flowing through the output switches of the other UPSs. The output line of any one UPS is the line between the output switch and the output terminal of the power converter. The current direction flowing through the bypass input switch of any UPS is different from the current direction flowing through the output switches of any one UPS, while the current direction flowing through the bypass input switches of the other UPSs is the same as the current direction flowing through the output switches of the other UPSs. Further, the third controller 24 is configured to, in response to the fourth fault signal, control the input switch Q11 to turn on. It is understandable that, taking any one uninterruptible power supply (UPS) as UPS 21a, and the other UPSs including UPS 21b to UPS 21n as examples, when the output lines of the bypass input switches and the output lines of the output switches in each UPS are short-circuited, and the direction of the current flowing through the output switch Q51 in UPS 21a is different from the direction of the current flowing through the output switches in UPS 21b to UPS 21n, it can be indicated that a short-circuit fault has occurred in the output line C of the output switch Q51 in UPS 21a, that is, a short-circuit fault has occurred in the internal circuit of UPS 21a. At this time, the direction of the short-circuit current inside the power module 2 can be as follows: Figure 5As shown, uninterruptible power supplies 21a, 21b, ..., 21n switch from the main circuit to the bypass circuit, forming short-circuit paths g, h, ..., i within the power module 2. For example, the output lines of the incoming switch Q11 and bypass input switch Q41 on short-circuit path g are all short-circuited; the output lines of the incoming switch Q11, bypass input switch Q42, output switch Q52, and output switch Q51 on short-circuit path h are all short-circuited; ..., the output lines of the incoming switch Q11, bypass input switch Q4n, output switch Q5n, and output switch Q51 on short-circuit path i are all short-circuited. During a short circuit in the output line C of the output switch Q51 in the uninterruptible power supply 21a, even if the short-circuit current on short-circuit path h and short-circuit path i is greater than or equal to the tripping current of the input switch Q11 and the bypass input and output switches in the uninterruptible power supply 21b to 21n, the input switch Q11 and the bypass input and output switches in the uninterruptible power supply 21b to 21n will remain in the conducting state and will not open (i.e., will not trip). By implementing the embodiments of this application, when a short-circuit fault occurs in the internal circuit of the uninterruptible power supply 21a, the over-tripping of the input switch Q11 and the bypass input and output switches in the uninterruptible power supply 21b to 21n can be avoided, thereby improving the power supply reliability of the power module 2.

[0050] In some feasible implementations, the number of uninterruptible power supplies (UPS) inside the power module 2 can also be one. Taking the power module 2 as an example where only UPS 21a is included, the conditions under which the second controller 23 controls the corresponding switch to open and issues the fourth fault signal can be replaced by both the output lines of the bypass input switch Q41 and the output switch Q51 being short-circuited, and the current direction flowing through the bypass input switch Q41 being different from the current direction flowing through the output switch Q51. Specifically, the current direction flowing through the bypass input switch Q41 is from the input terminal in1 of the UPS 21a to the output terminal out1, and the current direction flowing through the output switch Q51 is from the output terminal out1 of the UPS 21a to the input terminal in1.

[0051] In some feasible implementations, the second controller 23 is configured to output a third control signal to the bypass input switch and output switch of any uninterruptible power supply (UPS) when both the output lines of the bypass input switch and the output switch in each UPS are short-circuited, and the current direction flowing through the output switch of any UPS is different from the current direction flowing through the output switches of other UPSs. The third control signal is used to control the bypass input switch and output switch of any UPS to disconnect. After the bypass input switch and output switch of any UPS disconnects in response to the third control signal, the output line C with the short-circuit fault can be isolated. At this time, the output lines of the bypass input switch and output switch, as well as the input switch Q11 and other switches in each UPS, are no longer short-circuited. The second controller 23 also does not need to continue controlling the bypass input switches and output switches in other UPSs to be on, and the third controller 24 also does not need to continue controlling the input switch Q11 to be on. In other words, both the second controller 23 and the third controller 24 will release the control logic that prevents the corresponding switches from tripping. At this time, the bypass input switches, output switches, and incoming switch Q11 in other uninterruptible power supplies can be turned on or off. The specific switch states can be flexibly adjusted according to the actual application scenario, and no restrictions are imposed here.

[0052] In some feasible implementations, the second controller 23 is used to control the bypass input switches and output switches in other uninterruptible power supplies to disconnect when any bypass input switch and output switch in any uninterruptible power supply receives a third control signal and fails to disconnect after a third preset time, i.e., when the bypass input switch and output switch in any uninterruptible power supply trips abnormally, and sends a fourth tripping abnormality signal to the third controller 24. The third preset time can be determined by the tripping time of the switches in each uninterruptible power supply. It is understood that when any bypass input switch and output switch in any uninterruptible power supply trips abnormally, the output line C of the short-circuit fault cannot be properly isolated. At this time, the output lines of the bypass input switches and output switches in each uninterruptible power supply, as well as the input switch Q11, are still short-circuited. Further, the third controller 24 is used to control the input switch Q11 to disconnect in response to the fourth tripping abnormality signal. By implementing the embodiments of this application, when the bypass input switch and output switch in any uninterruptible power supply trip abnormally, the bypass input switch and output switch in other uninterruptible power supplies as well as the incoming switch Q11 can be controlled to disconnect, thereby isolating the already faulty output line C to avoid expanding the scope of the fault, and thus improving the power supply reliability of the power module 2.

[0053] In some feasible implementations, the second controller 23 is used to control one of the input switches in each uninterruptible power supply to disconnect when the output line of one of the main input switches and bypass input switches in each uninterruptible power supply is short-circuited, and to send a fifth fault signal to the third controller 24. Further, the third controller 24 is used to control the incoming switch Q11 to turn on in response to the fifth fault signal. It can be understood that, taking the main input switch Q31 in uninterruptible power supply 21a as an example, when the output line D of the main input switch Q31 is short-circuited, it can be determined that a short-circuit fault has occurred in the output line D of the main input switch Q31. At this time, the direction of the short-circuit current inside the power module 2 can be as follows... Figure 6 As shown, a short-circuit path j is formed inside the power module 2. The output lines of switches such as the incoming switch Q11 and the main input switch Q31 on this short-circuit path j are all short-circuited. During the short circuit of the output line D of the main input switch Q31, even if the short-circuit current on the short-circuit path j is greater than or equal to the tripping current of the incoming switch Q11, the incoming switch Q11 will remain in the conducting state and will not trip. Taking one of the input switches in the uninterruptible power supply 21a as the bypass input switch Q41 as an example, when the output line E of the bypass input switch Q41 is short-circuited, it can be seen that a short-circuit fault has occurred in the output line E of the bypass input switch Q41. At this time, the flow direction of the short-circuit current inside the power module 2 can be as follows... Figure 7 As shown, a short-circuit path k is formed inside the power module 2, and the output lines of switches such as the incoming switch Q11 and the bypass input switch Q41 on this short-circuit path k are all short-circuited. During the short circuit of the output line E of the bypass input switch Q41, even if the short-circuit current on the short-circuit path k is greater than or equal to the tripping current of the incoming switch Q11, the incoming switch Q11 will remain in the conducting state and will not open (i.e., it will not trip). By implementing the embodiments of this application, when a short-circuit fault occurs in the output line of one of the input switches in each uninterruptible power supply, the situation of the incoming switch Q11 tripping beyond its designated level can be avoided, thereby improving the power supply reliability of the power module 2.

[0054] In some feasible implementations, the second controller 23 is used to output a fourth control signal to one of the input switches in each uninterruptible power supply (UPS) when the output line of one of the main input switches and bypass input switches in each UPS is short-circuited. The fourth control switch controls one of the input switches in each UPS to disconnect. After one of the input switches in each UPS disconnects in response to the fourth control signal, the short-circuit faulty output line D or output line E can be isolated, and the output lines of one of the input switches and the incoming line switch Q11 are no longer short-circuited. Therefore, the third controller 24 does not need to continue controlling the incoming line switch Q11 to be on; that is, the third controller 24 will release the control logic that prevents the incoming line switch Q11 from tripping. At this time, the incoming line switch Q11 can be either on or off, and the specific switch state can be flexibly adjusted according to the actual application scenario, without limitation here.

[0055] In some feasible implementations, the second controller 23 is used to send a fifth tripping abnormality signal to the third controller 24 when one of the input switches in each uninterruptible power supply receives the fourth control signal and fails to disconnect after a fourth preset time, i.e., when one of the input switches in each uninterruptible power supply trips abnormally. The fourth preset time can be determined by the tripping time of the switches in each uninterruptible power supply and the incoming switch Q11. Further, the third controller 24 is used to control the incoming switch Q11 to disconnect in response to the fifth tripping abnormality signal. It is understood that when one of the input switches in each uninterruptible power supply trips abnormally, the output line D or output line E with the short circuit fault cannot be isolated, and the output lines of one of the input switches and the incoming switch Q11 in each uninterruptible power supply remain short-circuited. After the incoming switch Q11 disconnects, the output line D or output line E with the short circuit fault can be isolated to avoid expanding the fault range, thereby improving the power supply reliability of the power module 2.

[0056] In some feasible implementations, such as Figure 8 As shown above, Figure 2The power module 2 shown also includes a reactive power compensation input switch Q6 and a reactive power compensation unit (SVG) 25. The reactive power compensation input switch Q6 is connected between the incoming switch Q11 and the reactive power compensation unit 25. The incoming switch Q11 is also used to control the connection or disconnection between the input power supply 31 and the reactive power compensation input switch Q6. The aforementioned reactive power compensation input switch Q6 is used to control the connection or disconnection between the incoming switch Q11 and the reactive power compensation unit 25. It can be understood that the reactive power compensation input switch Q6 can be located outside or inside the reactive power compensation unit 25; this is not limited here. The aforementioned reactive power compensation unit 27 is used to realize dynamic compensation of the reactive power of the power module 2, improving the power supply efficiency and power quality of the power module 2. The second controller 23 is used to detect the voltage and current on the output line of the reactive power compensation input switch Q6 in real time, thereby determining whether the output line of the reactive power compensation input switch Q6 is short-circuited. The specific process can be found in the description above regarding the first controller 22 determining whether the output line of the feeder switch Q21 is short-circuited, and will not be repeated here. Furthermore, the second controller 23 is also used to control the reactive power compensation input switch Q6 to open when the output line of the reactive power compensation input switch Q6 is short-circuited, and to send a sixth fault signal to the third controller 24. Further still, the third controller 24 is used to control the incoming line switch Q11 to turn on in response to the sixth fault signal. It can be understood that when the output line F of the reactive power compensation input switch Q6 is short-circuited, a short-circuit fault occurs in the output line F of the reactive power compensation input switch Q6. At this time, the flow direction of the short-circuit current inside the power module 2 can be as follows... Figure 9 As shown, a short-circuit path l is formed inside the power module 2, and the output lines of switches such as the incoming switch Q11 and the reactive power compensation input switch Q6 on this short-circuit path l are all short-circuited. During the short circuit of the output line F of the reactive power compensation input switch Q6, even if the short-circuit current on the short-circuit path l is greater than or equal to the tripping current of the incoming switch Q11, the incoming switch Q11 will remain in the conducting state and will not open (i.e., it will not trip). By implementing the embodiment of this application, when a short-circuit fault occurs in the output line F of the reactive power compensation input switch Q6, the situation of the incoming switch Q11 tripping beyond its rated stage can be avoided, thereby improving the power supply reliability of the power module 2.

[0057] In some feasible implementations, the second controller 23 is further configured to output a fifth control signal to the reactive power compensation input switch Q6 when the output line of the reactive power compensation input switch Q6 is short-circuited. This fifth control signal controls the reactive power compensation input switch Q6 to disconnect. After the reactive power compensation input switch Q6 disconnects in response to the fifth control signal, the short-circuit faulty output line F is isolated, and the output lines of the reactive power compensation input switch Q6 and the incoming line switch Q11 are no longer short-circuited. Therefore, the third controller 24 does not need to continue controlling the incoming line switch Q11 to conduct; that is, the third controller 24 will release the control logic that prevents the incoming line switch Q11 from tripping. At this time, the incoming line switch Q11 can be either on or off, and the specific switch state can be flexibly adjusted according to the actual application scenario, without limitation here.

[0058] In some feasible implementations, the second controller 23 is further configured to send a sixth tripping anomaly signal to the third controller 24 when the reactive power compensation input switch Q6 receives the fifth control signal and fails to trip after a fifth preset time, i.e., when the reactive power compensation input switch Q6 trips abnormally. The fifth preset time can be determined by the tripping times of the reactive power compensation input switch Q6 and the incoming line switch Q11. Further, the third controller 24 is configured to control the incoming line switch Q11 to trip in response to the sixth tripping anomaly signal. It is understood that when the reactive power compensation input switch Q6 trips abnormally, the output line F with the short-circuit fault cannot be isolated, and the output lines of the reactive power compensation input switch Q6 and the incoming line switch Q11 remain short-circuited. After the incoming line switch Q11 trips, the output line F with the short-circuit fault can be isolated to avoid expanding the fault range, thereby improving the power supply reliability of the power module 2.

[0059] In some feasible implementations, the third controller 24 is used to detect the voltage and current on the output line of the incoming line switch Q11 in real time, thereby determining whether the output line of the incoming line switch Q11 is short-circuited. The specific process can be found in the description above regarding the first controller 22 determining whether the output line of the feeder switch Q21 is short-circuited, and will not be repeated here. Further, the third controller 24 is used to control the incoming line switch Q11 to disconnect when no fault signal is received from the second controller 23 and the output line of the incoming line switch Q11 is short-circuited. The fault signal sent by the second controller 23 can be a second fault signal, a third fault signal, a fourth fault signal, a fifth fault signal, or a sixth fault signal. It can be understood that when no fault signal is received from the second controller 23 and the output line of the incoming line switch Q11 is short-circuited, a short-circuit fault occurs in the output line G of the incoming line switch Q11. At this time, the short-circuit current flow inside the power module 2 can be as follows... Figure 10As shown, a short-circuit path m is formed inside the power module 2, wherein the output line G of the incoming switch Q11 on the short-circuit path m is short-circuited. When the incoming switch Q11 is opened, the faulty output line G can be isolated to prevent the fault from spreading to the input power supply 31 and causing it to fail, thereby reducing the failure rate of the input power supply 31.

[0060] In some feasible implementations, such as Figure 11 As shown above, Figure 8 The power module output terminal out31 shown is also used to connect to load 41 via switch Q7, which is controlled by the fourth controller 5. The fourth controller 5 can communicate with the first controller 22, the second controller 23, and the third controller 24 via wired or wireless communication to send or receive data (such as the seventh fault signal described below). The fourth controller 5 is used to detect the voltage and current on the output line of switch Q7 in real time to determine whether the output line of switch Q7 is short-circuited. The specific process can be found in the description above regarding the first controller 22's determination of whether the output line of feeder switch Q21 is short-circuited, and will not be repeated here. The fourth controller 5 is also used to control switch Q7 to open when the output line of switch Q7 is short-circuited, i.e., a short-circuit fault occurs in the output line of switch Q7, and send the seventh fault signal to the first controller 22. Further, the first controller 22 is used to control feeder switch Q21 to open in response to the seventh fault signal. When the seventh fault signal is received and the output line of feeder switch Q21 is short-circuited, it sends an eighth fault signal to the second controller 23. Furthermore, the second controller 23, in response to the eighth fault signal, controls the bypass input switch and output switch in each uninterruptible power supply to be turned on. When the eighth fault signal is received, the output lines of the bypass input switches and output switches in each uninterruptible power supply are short-circuited, and the current flowing through the output switches in uninterruptible power supplies 21a to 21n is in the same direction, a ninth fault signal is sent to the third controller 24. Further, the third controller 24, in response to the ninth fault signal, controls the incoming line switch Q11 to be turned on. It can be understood that during the short circuit of the output line of switch Q7, even if the short-circuit current on the output line is greater than or equal to the tripping current of the switch in power module 2, the switch in power module 2 will remain in the on state and will not be turned off (i.e., will not trip). The switches in power module 2 include the incoming line switch Q11, the bypass input switches and output switches in each uninterruptible power supply, and the feeder switch Q21. By implementing the embodiments of this application, when a short circuit fault occurs in the output line of switch Q7, that is, when a short circuit fault occurs outside the power module 2, the switch inside the power module 2 can be prevented from tripping out of its proper stage, thereby further improving the power supply reliability of the power module 2.

[0061] In some feasible implementations, when the power module 2 includes multiple incoming line switches and multiple feeder switches, it can be specifically as follows: Figure 12 As shown above, Figure 8 The power module 2 shown also includes an incoming line switch Q12, a transformer T, an input bus 26, a feeder bus 27, and a feeder switch Q2m. The transformer T is connected between the input power supply 31 and the incoming line switch Q11. The incoming line switch Q12 is connected between the input power supply 32 and the input bus 26. The input bus 26 is connected between the incoming line switches Q11 and Q12 and the input terminals of each uninterruptible power supply (UPS). The feeder bus 27 is connected between the output terminal of each UPS and the feeder switches Q21 and Q2m. The feeder switch Q2m is connected to the power module output terminal out3m, ​​which is used to connect the load 4m. It should be understood that the incoming line switches in power module 2 are connected one-to-one with the input power supplies, and the feeder switches in power module 2 are connected one-to-one with the output terminals of the power module. This embodiment does not limit the number of incoming line switches and feeder switches. For example, the input power supply 31 can be the power grid or a generator, and the input power supply 32 can be the input bus inside another power module. Since the incoming line switch Q12 connects the input bus 26 inside power module 2 to the input bus inside another power module, it can also be called a bus tie switch. For example, each load in load 41 and load 4m can be an IT device or a power device. Each of the above uninterruptible power supplies also includes a bypass module, which controls the connection or disconnection between the bypass input switch and the output of the power converter. The bypass module typically includes a silicon controlled rectifier (SCR). When the SCR is on, the bypass module controls the connection between the bypass input switch and the output of the power converter; when the SCR is off, the bypass module controls the disconnection between the bypass input switch and the output of the power converter. For example, the bypass 212a of the uninterruptible power supply 21a is further provided with a bypass module 2121a, which is connected between the bypass input switch Q41 and the output terminal out2 of the power converter 2111a. The bypass 212b of the uninterruptible power supply 21b is further provided with a bypass module 2121b, which is connected between the bypass input switch Q42 and the output terminal of the power converter 2111b. ... The bypass 212n of the uninterruptible power supply 21n is further provided with a bypass module 2121n, which is connected between the bypass input switch Q4n and the output terminal of the power converter 2111n.

[0062] When the input power supply 31 is supplying power normally, the transformer T is used to convert the AC power output from the input power supply 31 and output the first AC power. The third controller 24 is used to control the incoming line switch Q11 to be turned on and the incoming line switch Q12 to be turned off. At this time, the incoming line switch Q11 is used to transmit the first AC power output from the transformer T to each of the uninterruptible power supplies 21b to 21n through the input bus 26. When the input power supply 31 experiences a short circuit fault or power failure, the third controller 24 is used to control the incoming line switch Q11 to be turned off and the incoming line switch Q12 to be turned on. At this time, the incoming line switch Q12 is used to transmit the AC power output from the input power supply 32 to each uninterruptible power supply through the input bus 26. Further, the second controller 23 is used to control the main input switch and output switch in each uninterruptible power supply to be turned on and the bypass input switch to be turned off, and to control the power converter in each uninterruptible power supply to convert the first AC power and output the second AC power to the feeder bus 27. At this time, the main input switch on the main circuit of each uninterruptible power supply (UPS) is in the ON state, thus each UPS provides main circuit power. When a short circuit fault occurs in the main input switch or power converter on the main circuit, preventing power supply, the second controller 23 is also used to control the bypass input switch and output switch in each UPS to be ON and control the main input switch to be OFF. The bypass module in each UPS controls the connection between the bypass input switch and the output terminal of the power converter to output the first AC power to the feeder bus 27. At this time, the bypass input switch on the bypass in each UPS is in the ON state, thus each UPS provides bypass power. Furthermore, the first controller 22 is used to control the feeder switch Q21 and feeder switch Q2m to be ON, so that the AC power (such as the second AC power or the first AC power) on the feeder bus 27 is output to the loads 41 and 4m for power supply.

[0063] In some feasible implementations, such as Figure 12As shown, each of the above uninterruptible power supplies (UPS) also includes an isolating switch, which is connected between the input and output terminals of each UPS. For example, UPS 21a also includes an isolating switch Q81, connected between the input terminal in1 and the output terminal out1 of UPS 21a; UPS 21b also includes an isolating switch Q82, connected between the input and output terminals of UPS 21b; and so on, UPS 21n also includes an isolating switch Q8n, connected between the input and output terminals of UPS 21n. The second controller 23 is used to control the isolating switch in each UPS to conduct when a fault occurs within each UPS, such as a short circuit fault in the output line C of the output switch Q51 in UPS 21a, thereby facilitating online maintenance or debugging of the faulty UPS.

[0064] In some feasible implementations, for each uninterruptible power supply, at least one of the main input switch, bypass input switch, output switch, and isolating switch may be located outside each uninterruptible power supply, without limitation.

[0065] In some feasible implementations, such as Figure 12 As shown above, Figure 8 The power module 2 shown also includes a maintenance bypass switch Q9, which is connected between the input bus 26 and the feeder bus 27 and is located outside all uninterruptible power supplies (UPS). The second controller 23 is used to control the maintenance bypass switch Q9 to be turned on when maintenance or repair of UPS 21b to UPS 21n is required, thereby facilitating online maintenance or repair of all UPS.

[0066] In the power module 2 provided in this application, the situation of the switch in the power module tripping beyond its designated level can be avoided, thereby improving the power supply reliability of the power module.

[0067] See Figure 13 , Figure 13 This is a flowchart illustrating the method for preventing over-level tripping provided in an embodiment of this application. Figure 13 As shown, the method for preventing over-level tripping includes the following steps S101 and S102.

[0068] In step S101, when the output line of the feeder switch is short-circuited, the first controller controls the feeder switch to open and sends a first fault signal to the second controller.

[0069] In step S101, the feeder switch is used to control the connection or disconnection between the output terminal of each of the at least two uninterruptible power supplies and the output terminal of the power module.

[0070] In step S102, the second controller responds to the first fault signal by controlling the bypass input switch and output switch in each uninterruptible power supply to be turned on.

[0071] In step S102, each uninterruptible power supply (UPS) includes a main circuit, a bypass circuit, and an output switch. The main circuit includes a main circuit input switch and a power converter. The main circuit input switch controls the connection between the input terminal of each UPS and the input terminal of the power converter. The bypass circuit includes a bypass input switch, which controls the connection between the input terminal of each UPS and the output terminal of the power converter. The output switch controls the connection between the output terminal of the power converter and the output terminal of each UPS.

[0072] By implementing the embodiments of this application, when a short circuit fault occurs in the output line of the feeder switch, the bypass input switch and output switch in each uninterruptible power supply can be prevented from tripping out of their respective stages, thereby improving the power supply reliability of the power module.

[0073] In some feasible implementations, when the second controller receives a first fault signal, and the output lines of the bypass input switches and output switches in each uninterruptible power supply (UPS) are short-circuited, and the current flowing through the output switches in at least two UPSs is in the same direction, the second controller sends a second fault signal to the third controller. Further, the third controller, in response to the second fault signal, controls the incoming line switch to turn on. The incoming line switch is used to control the connection or disconnection between the input power supply and the input terminal of each UPS. By implementing the embodiments of this application, when a short-circuit fault occurs in the output line of the feeder switch, the incoming line switch can be prevented from tripping beyond its cascading point, thereby improving the power supply reliability of the power module.

[0074] In some feasible implementations, when the second controller does not receive the first fault signal, the output lines of the bypass input switches and the output switches in each uninterruptible power supply (UPS) are short-circuited, and the current flowing through the output switches in at least two UPSs is in the same direction, the second controller controls the output switches in each UPS to open and controls the bypass input switches in each UPS to close, sending a third fault signal to the third controller. Further, in response to the third fault signal, the third controller controls the incoming line switch to close. The incoming line switch controls the connection or disconnection between the input power supply and the input terminal of each UPS. By implementing the embodiments of this application, when a short-circuit fault occurs in the output line of the output switch in each UPS (i.e., the line between the output switch and the feeder switch in each UPS), the cascading tripping of the incoming line switch and the bypass input switch in each UPS can be avoided, thereby improving the power supply reliability of the power module.

[0075] In some feasible implementations, when the output lines of the bypass input switches and output switches in each uninterruptible power supply (UPS) are short-circuited, and the current direction flowing through the output switches of any one of the at least two UPSs is different from the current direction flowing through the output switches of the other UPSs, the second controller controls the bypass input switches and output switches of any one UPS to disconnect, and controls the bypass input switches and output switches of the other UPSs to turn on, sending a fourth fault signal to the third controller. Further, the third controller, in response to the fourth fault signal, controls the incoming line switch to turn on. The incoming line switch is used to control the connection or disconnection between the input power supply and the input terminal of each UPS. Implementing the embodiments of this application, when a short-circuit fault occurs in the output line of the output switch in any UPS (i.e., the line between the output switch and the output terminal of the power converter), i.e., a short-circuit fault occurs within any UPS, the incoming line switch and the bypass input switches and output switches of the other UPSs can be prevented from tripping cascadingly, thereby improving the power supply reliability of the power module.

[0076] In some feasible implementations, when the output line of one of the main input switches and bypass input switches in each uninterruptible power supply (UPS) is short-circuited, the second controller controls one of the input switches in each UPS to disconnect and sends a fifth fault signal to the third controller. Further, in response to the fifth fault signal, the third controller controls the incoming line switch to turn on. The incoming line switch controls the connection or disconnection between the input power supply and the input terminal of each UPS. By implementing the embodiments of this application, when a short-circuit fault occurs in the output line of one of the input switches in each UPS, the incoming line switch can be prevented from tripping beyond its cascading limit, thereby improving the power supply reliability of the power module.

[0077] In some feasible implementations, when a short circuit occurs in the output line of the reactive power compensation input switch, the second controller controls the reactive power compensation input switch to disconnect and sends a sixth fault signal to the third controller. The reactive power compensation input switch controls the connection or disconnection between the incoming line switch and the reactive power compensation unit. Further, in response to the sixth fault signal, the third controller controls the incoming line switch to connect. The incoming line switch controls the connection or disconnection between the input power supply and the reactive power compensation input switch. By implementing the embodiments of this application, when a short circuit fault occurs in the output line of the reactive power compensation input switch, the situation of the incoming line switch tripping beyond its designated level can be avoided, thereby improving the power supply reliability of the power module.

[0078] It should be noted that for further operations performed by the first controller, second controller, and third controller in the anti-overlapping tripping method provided in this application, and their corresponding beneficial effects, please refer to the above. Figures 2 to 12The implementation methods and corresponding beneficial effects of the first controller 22, the second controller 23 and the third controller 24 in the corresponding embodiments will not be described in detail here.

[0079] The anti-overspeed tripping mechanism provided in this application can prevent the switches in the power module from tripping beyond their designated levels, thereby improving the power supply reliability of the power module.

[0080] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A power module with anti-overspeed tripping capability, characterized in that, The power module includes an incoming line switch, at least two uninterruptible power supplies, a feeder switch, a first controller, and a second controller. The input switch is used to control the connection or disconnection between the input power supply and the input terminal of each of the at least two uninterruptible power supplies; the feeder switch is used to control the connection or disconnection between the output terminal of each uninterruptible power supply and the output terminal of the power module. Each uninterruptible power supply (UPS) includes a main circuit, a bypass circuit, and an output switch. The main circuit is equipped with a main circuit input switch and a power converter. The main circuit input switch controls the connection or disconnection between the input terminal of each UPS and the input terminal of the power converter. The bypass circuit is equipped with a bypass input switch, which controls the connection or disconnection between the input terminal of each UPS and the output terminal of the power converter. The output switch controls the connection or disconnection between the output terminal of the power converter and the output terminal of each UPS. The first controller is used to control the feeder switch to open when the output line of the feeder switch is short-circuited, and to send a first fault signal to the second controller; The second controller is used to control the bypass input switch and the output switch in each uninterruptible power supply to be turned on in response to the first fault signal.

2. The power module according to claim 1, characterized in that, The power module also includes a third controller; The second controller is further configured to send a second fault signal to the third controller when it receives the first fault signal, and the output lines of the bypass input switch and the output switch in each uninterruptible power supply are short-circuited, and the current flowing through the output switches in at least two uninterruptible power supplies is in the same direction. The third controller is used to control the incoming line switch to be turned on in response to the second fault signal.

3. The power module according to claim 1, characterized in that, The power module also includes a third controller; The second controller is configured to, when the first fault signal is not received, the output lines of the bypass input switch and the output lines of the output switch in each uninterruptible power supply are short-circuited, and the current flowing through the output switches in at least two uninterruptible power supplies is in the same direction, control the output switch in each uninterruptible power supply to open and control the bypass input switch in each uninterruptible power supply to turn on, and send a third fault signal to the third controller. The third controller is used to control the incoming line switch to be turned on in response to the third fault signal.

4. The power module according to claim 1, characterized in that, The power module also includes a third controller; The second controller is configured to, when the output lines of the bypass input switch and the output switch in each uninterruptible power supply are short-circuited, and the direction of the current flowing through the output switch in any one of the at least two uninterruptible power supplies is different from the direction of the current flowing through the output switch in the other uninterruptible power supplies, control the bypass input switch and the output switch in any one of the uninterruptible power supplies to disconnect, and control the bypass input switch and the output switch in the other uninterruptible power supplies to turn on, and send a fourth fault signal to the third controller; The third controller is used to control the incoming line switch to be turned on in response to the fourth fault signal.

5. The power module according to claim 1, characterized in that, The power module also includes a third controller; The second controller is used to control one of the input switches in each uninterruptible power supply to disconnect when the output line of one of the main input switch and the bypass input switch in each uninterruptible power supply is short-circuited, and to send a fifth fault signal to the third controller. The third controller is used to control the incoming line switch to be turned on in response to the fifth fault signal.

6. The power module according to claim 1, characterized in that, The power module further includes a reactive power compensation input switch and a reactive power compensation unit; the incoming line switch is also used to control the connection or disconnection between the input power supply and the reactive power compensation input switch; the reactive power compensation input switch is used to control the connection or disconnection between the incoming line switch and the reactive power compensation unit; the power module further includes a third controller; The second controller is used to control the reactive power compensation input switch to open when the output line of the reactive power compensation input switch is short-circuited, and to send a sixth fault signal to the third controller; The third controller is used to control the incoming line switch to turn on in response to the sixth fault signal.

7. A method for preventing over-level tripping, characterized in that, The method includes: When the output line of the feeder switch is short-circuited, the first controller controls the feeder switch to open and sends a first fault signal to the second controller; the feeder switch is used to control the connection or disconnection between the output terminal of each of the at least two uninterruptible power supplies and the output terminal of the power module. In response to the first fault signal, the second controller controls the bypass input switch and output switch in each uninterruptible power supply (UPS) to be turned on. Each UPS includes a main circuit, a bypass circuit, and an output switch. The main circuit is equipped with a main circuit input switch and a power converter. The main circuit input switch controls the connection or disconnection between the input terminal of each UPS and the input terminal of the power converter. The bypass circuit is equipped with a bypass input switch, which controls the connection or disconnection between the input terminal of each UPS and the output terminal of the power converter. The output switch controls the connection or disconnection between the output terminal of the power converter and the output terminal of each UPS.

8. The method according to claim 7, characterized in that, The method further includes: When the second controller receives the first fault signal, the output lines of the bypass input switch and the output lines of the output switch in each uninterruptible power supply are short-circuited, and the current flowing through the output switches in at least two uninterruptible power supplies is in the same direction, the second controller sends a second fault signal to the third controller. In response to the second fault signal, the third controller controls the incoming line switch to be turned on. The incoming line switch is used to control the connection or disconnection between the input power supply and the input terminal of each uninterruptible power supply.

9. The method according to claim 7, characterized in that, The method further includes: When the second controller does not receive the first fault signal, the output lines of the bypass input switch and the output switch in each uninterruptible power supply are short-circuited, and the current flowing through the output switches in at least two uninterruptible power supplies is in the same direction, the second controller controls the output switches in each uninterruptible power supply to open and controls the bypass input switches in each uninterruptible power supply to turn on, and sends a third fault signal to the third controller. In response to the third fault signal, the third controller controls the incoming line switch to be turned on. The incoming line switch is used to control the connection or disconnection between the input power supply and the input terminal of each uninterruptible power supply.

10. The method according to claim 7, characterized in that, The method further includes: When the output lines of the bypass input switch and the output switch in each of the uninterruptible power supplies are short-circuited, and the direction of the current flowing through the output switch in any one of the at least two uninterruptible power supplies is different from the direction of the current flowing through the output switch in the other uninterruptible power supplies, the second controller controls the bypass input switch and the output switch in any one of the uninterruptible power supplies to disconnect, and controls the bypass input switch and the output switch in the other uninterruptible power supplies to turn on, and sends a fourth fault signal to the third controller; In response to the fourth fault signal, the third controller controls the incoming line switch to be turned on. The incoming line switch is used to control the connection or disconnection between the input power supply and the input terminal of each uninterruptible power supply.

11. The method according to claim 7, characterized in that, The method further includes: When the output line of one of the main input switches and the bypass input switches in each uninterruptible power supply is short-circuited, the second controller controls one of the input switches in each uninterruptible power supply to open and sends a fifth fault signal to the third controller. In response to the fifth fault signal, the third controller controls the incoming line switch to be turned on. The incoming line switch is used to control the connection or disconnection between the input power supply and the input terminal of each uninterruptible power supply.

12. The method according to claim 7, characterized in that, The method further includes: When the output line of the reactive power compensation input switch is short-circuited, the second controller controls the reactive power compensation input switch to open and sends a sixth fault signal to the third controller. The reactive power compensation input switch is used to control the conduction or disconnection between the incoming switch and the reactive power compensation unit. In response to the sixth fault signal, the third controller controls the incoming line switch to be turned on. The incoming line switch is used to control the connection or disconnection between the input power supply and the reactive power compensation input switch.

Images