Fault detection processing method and device for uninterruptible power supply, and controller

Abstract

The invention provides a fault detection processing method and device for an uninterruptible power supply, and a controller, and the method comprises the steps: sampling the current of at least one to-be-detected sampling point in at least one to-be-detected fault loop in the uninterruptible power supply, and comparing the current with a corresponding fault current range; according to the method and the device, the fault circuit to be checked is detected to determine that a fault device causing current abnormity exists in the fault circuit to be checked, and the operation state of the rectifying and discharging multiplexing circuit is adjusted based on the fault switching device, so that the fault circuit where the fault switching device is located is cut off, the influence of fault current on the uninterruptible power supply is terminated in time, and the reliability of a power supply system is guaranteed.

Description

Technical Field

[0001] This application relates to the field of uninterruptible power supplies, and in particular to a method, device, and controller for fault detection and handling of an uninterruptible power supply. Background Art

[0002] An uninterruptible power supply (UPS) is a device that provides stable electrical energy for subsequent devices in a data center. The UPS includes a battery pack, a rectifier-discharge multiplexing circuit, an inverter circuit, a battery charging circuit, and a switching device. The switching device is electrically connected to the battery device and the rectifier-discharge multiplexing circuit, and is used to supply battery energy storage to the rectifier-discharge multiplexing circuit when the UPS operates in battery mode, so that the rectifier-discharge multiplexing circuit can also supply electrical energy to the inverter circuit to improve the utilization rate of components.

[0003] The uninterruptible power supply includes at least one mains switch device and at least one battery switch device. The battery switch device is connected in series between the input terminal of the rectifier-discharge multiplexing circuit and the terminal of the battery pack as a switching device. The mains switch device is connected in series between the mains input terminal of the uninterruptible power supply and the input terminal of the rectifier-discharge multiplexing circuit. When any one of the switch devices is short-circuited and the other switch device electrically connected to it is closed (for example, when the mains switch device is closed and the battery switch device electrically connected to it is short-circuited), a short-circuit loop will be formed between the battery and the mains. This short-circuit loop passes through the bus capacitor, and the short-circuit voltage generated by the superposition of the battery voltage and the mains voltage far exceeds the rated value of the bus capacitor, which will cause the bus capacitor to fail, resulting in power loss of the subsequent devices of the UPS and reducing the reliability of the UPS. Summary of the Invention

[0004] This application provides a method, device, and controller for fault detection and handling of an uninterruptible power supply to solve the above technical problems.

[0005] In a first aspect, this application provides a method for fault detection and handling of an uninterruptible power supply. The method is applied to an uninterruptible power supply, and the uninterruptible power supply includes at least one uninterruptible power supply module. Each of the uninterruptible power supply modules includes: a rectifier-discharge multiplexing circuit, a battery, at least one mains switch device, and at least one battery switch device. The first end of each mains switch device is coupled to the mains input terminal of the uninterruptible power supply, and the second end is electrically connected to the rectifier-discharge multiplexing circuit and the first end of a corresponding battery switch device. The second end of the battery switch device is coupled to the battery;

[0006] The method includes:

[0007] Obtain the current value of at least one sampling point to be measured in the uninterruptible power supply; the sampling point to be measured is located in at least one fault loop to be checked in the uninterruptible power supply, and each of the fault loops to be checked includes at least one mains switch device and at least one battery switch device;

[0008] When the current value is within the fault current range corresponding to the sampling point to be measured, determine that at least one switch device in the fault loop to be checked is faulty;

[0009] Based on the faulty switch device, adjust the operating state of the rectification and discharge multiplexing circuit to cut off the fault loop where the faulty switch device is located.

[0010] In the above technical solution, by sampling the current at at least one sampling point to be measured in at least one fault loop to be checked in the uninterruptible power supply and comparing it with the corresponding fault current range, it is determined that there is a faulty device causing abnormal current in the fault loop to be checked, and based on the faulty switch device, the operating state of the rectification and discharge multiplexing circuit is adjusted, so as to cut off the fault loop where the faulty switch device is located, so as to terminate the influence of the fault current on the uninterruptible power supply in time and ensure the reliability of the power supply system.

[0011] In a second aspect, the present application provides a fault detection and processing device for an uninterruptible power supply, including:

[0012] An acquisition module, configured to obtain the current value of at least one sampling point to be measured in the uninterruptible power supply; the sampling point to be measured is located in at least one fault loop to be checked in the uninterruptible power supply, and each of the fault loops to be checked includes at least one mains switch device and at least one battery switch device;

[0013] A processing module, configured to determine that at least one switch device in the fault loop to be checked is faulty when the current value is within the fault current range corresponding to the sampling point to be measured;

[0014] The processing module is further configured to adjust the operating state of the rectification and discharge multiplexing circuit based on the faulty switch device to cut off the fault loop where the faulty switch device is located.

[0015] In a third aspect, the present application provides a controller, including: a processor and a memory communicatively connected to the processor;

[0016] The memory stores computer-executable instructions;

[0017] When the processor executes the computer-executable instructions, it is configured to implement the method according to any one of the first aspect.

[0018] The present application provides a fault detection and processing method, device and controller for an uninterruptible power supply. The uninterruptible power supply includes at least one uninterruptible power supply module, each of which includes: a rectifier-discharge multiplexing circuit, a battery, at least one AC power switch device and at least one battery switch device. The first end of each AC power switch device is coupled to the AC power input end of the uninterruptible power supply, and the second end is electrically connected to the rectifier-discharge multiplexing circuit and the first end of a corresponding battery switch device. The second end of the battery switch device is coupled to the battery. The current of at least one sampling point to be measured in at least one fault circuit to be checked in the uninterruptible power supply is sampled and compared with the corresponding fault current range to determine whether there is a fault device causing current abnormality in the fault circuit to be checked, and based on the faulty switch device, the operating state of the rectifier-discharge multiplexing circuit is adjusted to cut off the fault circuit where the faulty switch device is located, so as to promptly terminate the influence of the fault current on the uninterruptible power supply and ensure the reliability of the power supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0020] Figure 1 A schematic diagram of the structure of an uninterruptible power supply provided by the present application according to an exemplary embodiment;

[0021] Figures 2A to 2C A schematic diagram of the structure of an uninterruptible power supply provided by the present application according to another exemplary embodiment;

[0022] Figure 3 A flowchart of a method for detecting and processing a fault of an uninterruptible power supply provided by the present application according to an exemplary embodiment;

[0023] Figure 4 A schematic diagram of the detection point locations provided by the present application according to an exemplary embodiment;

[0024] Figure 5 A schematic flow chart of a method for detecting and processing a fault of an uninterruptible power supply provided by the present application according to another exemplary embodiment;

[0025] Figure 6 A schematic flow chart of a method for detecting and processing a fault of an uninterruptible power supply provided by the present application according to another exemplary embodiment;

[0026] Figure 7 A schematic diagram of detection point locations provided by the present application according to another exemplary embodiment;

[0027] Figure 8 A schematic flow chart of a method for detecting and processing a fault of an uninterruptible power supply provided by the present application according to another exemplary embodiment;

[0028] Figure 9 Schematic diagram of the detection point positions provided by the present application according to another exemplary embodiment;

[0029] Figure 10 Schematic flowchart of the fault detection and processing method for an uninterruptible power supply provided by the present application according to another exemplary embodiment;

[0030] Figure 11 Schematic flowchart of the fault detection and processing method for an uninterruptible power supply provided by the present application according to another exemplary embodiment;

[0031] Figure 12 Schematic diagram of the detection point positions provided by the present application according to another exemplary embodiment;

[0032] Figure 13 Schematic flowchart of the fault detection and processing method for an uninterruptible power supply provided by the present application according to another exemplary embodiment;

[0033] Figure 14 Schematic diagram of the detection point positions provided by the present application according to another exemplary embodiment;

[0034] Figure 15 Schematic flowchart of the fault detection and processing method for an uninterruptible power supply provided by the present application according to another exemplary embodiment;

[0035] Figure 16 Schematic flowchart of the fault detection and processing method for an uninterruptible power supply provided by the present application according to another exemplary embodiment;

[0036] Figure 17 Schematic diagram of the structure of the fault detection and processing device for an uninterruptible power supply provided by the present application according to an exemplary embodiment;

[0037] Figure 18 Schematic diagram of the structure of the controller provided by the present application according to an embodiment.

[0038] Through the above-mentioned drawings, the specific embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0039] Exemplary embodiments will be described in detail herein, and examples thereof are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0040] A data center, commonly known as a computer room, includes a computer system, a communication system, a storage system, environmental control equipment, monitoring equipment, and various security devices. Stable power supply for the data center is a prerequisite for ensuring its stable operation. Therefore, an uninterruptible power supply is generally set up in the data center, electrically connected between the commercial power and the electrical equipment in the data center, for stably and continuously supplying power to each electrical equipment.

[0041] Figure 1 FIG. is a schematic circuit diagram of an uninterruptible power supply provided by an exemplary embodiment of the present application. As Figure 1 shown, the uninterruptible power supply includes a UPS pre-stage distribution transformer 101, an uninterruptible power supply module 00, and a battery 104. The uninterruptible power supply module 00 includes a UPS rectifier / discharge multiplexing converter 102, a battery charging circuit 103, a plurality of commercial power relays RLY1-RLY6, bus capacitors C1, C2, a charger capacitor C3, charger relays RLY13, RLY14, a plurality of commercial power fuses Fuse1-Fuse3, battery fuses Fuse4, Fuse5, and a plurality of battery relays RLY7-RLY12. Among them, the rectifier / discharge multiplexing circuit 102 includes two rectifier / discharge multiplexing units 1021 and 1022.

[0042] The UPS pre-stage distribution transformer 101 includes Lu, Lv, Lw, and N lines. The three-phase power output terminals are respectively electrically connected to the three commercial power fuses Fuse1-Fuse3. Each commercial power fuse is electrically connected to the corresponding-phase input terminals of the two rectifier / discharge multiplexing units 1021 and 1022. A corresponding commercial power relay is also connected in series between the commercial power fuse and the input terminal: the commercial power fuse Fuse1 at the U-phase output terminal is electrically connected to the commercial power relay RLY1 in the rectifier / discharge multiplexing circuit 1021 and the commercial power relay RLY4 in the rectifier / discharge multiplexing unit 1022; the commercial power fuse Fuse2 corresponding to the V-phase power is electrically connected to the commercial power relays RLY2 and RLY5; the commercial power fuse Fuse3 corresponding to the W-phase power is electrically connected to the commercial power relays RLY3 and RLY6.

[0043] The bus capacitor C1 is connected across the two output terminals of the rectifying and discharging multiplexing unit 1021, and the bus capacitor C2 is connected across the two output terminals of the rectifying and discharging multiplexing unit 1022. The first end of the bus capacitor C1 is connected to the bus BUS+, the second end is connected to the neutral line N, the first end of the bus capacitor C2 is connected to the neutral line N, and the second end is connected to the bus BUS-.

[0044] The bus is electrically connected to the two input terminals of the battery charging circuit 103. One output terminal of the battery charging circuit 103 is connected in series with the charger relay RLY13 and the battery fuse Fuse4 and then electrically connected to the positive electrode of the battery 104, and the other output terminal of the battery charging circuit 103 is connected in series with the charger relay RLY14 and the battery fuse Fuse5 and then electrically connected to the negative electrode of the battery 104.

[0045] The battery charging circuit 103 includes a plurality of transistors, and each transistor is anti-parallel connected with a freewheeling diode. One output terminal thereof connected to the bus BUS- is electrically connected to the positive electrode of a freewheeling diode, and one input terminal thereof connected to the charger relay RLY14 is electrically connected to the negative electrode of the freewheeling diode.

[0046] The battery fuse Fuse4 and the charger relay RLY13 are electrically connected at a point A. The point A is electrically connected to the second ends of the three mains relays in the rectifying and discharging multiplexing unit 1021, and the first ends of the mains relays are electrically connected to the corresponding mains fuses. A battery relay is respectively connected in series between the point A and the second ends of each mains relay: a battery relay RLY7 is connected in series between the point A and the mains relay RLY1, a battery relay RLY8 is connected in series between the point A and the mains relay RLY2, and a battery relay RLY9 is connected in series between the point A and the mains relay RLY3.

[0047] The battery fuse Fuse5 and the charger relay RLY14 are electrically connected at a point B. The point B is electrically connected to the second ends of the three mains relays in the rectifying and discharging multiplexing unit 1022, and the first ends of the mains relays are electrically connected to the corresponding mains fuses. A battery relay is respectively connected in series between the point B and the second ends of each mains relay: a battery relay RLY10 is connected in series between the point B and the mains relay RLY4, a battery relay RLY11 is connected in series between the point B and the mains relay RLY5, and a battery relay RLY12 is connected in series between the point B and the mains relay RLY6.

[0048] Based on the circuit connection relationship of the above uninterruptible power supply, it can be known that when the uninterruptible power supply operates in the mains mode, the mains relay is closed. If the battery relay electrically connected to it is short-circuited, a short-circuit loop will be formed between the battery and the mains; when the uninterruptible power supply operates in the battery mode, the battery relay is closed. If the mains relay electrically connected to it is short-circuited, a short-circuit loop will also be formed between the battery and the mains (for example: when the mains relay RLY1 is closed, the battery relay RLY7 is short-circuited, or when the battery relay RLY7 is closed, the mains relay RLY1 is short-circuited, then the short-circuit loop includes : Battery +, battery fuse Fuse4, battery relay RLY7, AC relay RLY1, AC fuse Fuse1, U phase electricity, neutral line N, bus capacitor C2, transistor Q15 anti-parallel freewheeling diode, inductor L8, charger relay RLY14, battery fuse Fuse5, battery -). The voltage value of the short-circuit loop superimposes the battery voltage and one-phase voltage of the AC power. The superimposed voltage will act on the bus capacitor, which is far beyond the rated value of the bus capacitor, causing the bus capacitor to fail, thereby causing the subsequent equipment of the UPS to lose power and reducing the reliability of the UPS.

[0049] In order to solve the above problems, the present application provides a fault detection and processing method, device and controller for an uninterruptible power supply. The technical concept of the present application is: the uninterruptible power supply includes at least one uninterruptible power supply module, each uninterruptible power supply module includes: a rectifier and discharge multiplexing circuit, a battery, at least one AC power switch device and at least one battery switch device, the first end of each AC power switch device is electrically connected to the AC input end of the uninterruptible power supply, the second end is electrically connected to the rectifier and discharge multiplexing circuit and the first end of a corresponding battery switch device, the second end of the battery switch device is coupled to the battery, by sampling the current of at least one sampling point to be measured in at least one fault circuit to be checked in the uninterruptible power supply, and comparing it with the corresponding fault current range, so as to determine whether there is a fault device causing current abnormality in the fault circuit to be checked, and based on the faulty switch device, adjust the operating state of the rectifier and discharge multiplexing circuit, so as to cut off the fault circuit where the faulty switch device is located, and timely terminate the influence of the fault current on the uninterruptible power supply, so as to ensure the reliability of the power supply system.

[0050] The technical solution of the present application is described in detail with specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0051] First, the circuit structure of the uninterruptible power supply is explained. The fault detection and processing method of the uninterruptible power supply provided in the present application can be applied to an uninterruptible power supply using a rectifier-discharge multiplexing converter, in which a battery switch device is connected in series between the battery and the input end of the rectifier-discharge multiplexing circuit. Figure 1In addition to the uninterruptible power supply shown, Figure 1 Variations of the circuit structure shown include, but are not limited to: an uninterruptible power supply (such as an uninterruptible power supply module) electrically connected in parallel between the UPS front-stage distribution transformer 101 and the battery 104. Figure 2C As shown); the rectifier discharge multiplexing conversion unit 102 includes only one rectifier discharge multiplexing circuit uninterruptible power supply; Figure 1 The Vienna topology in the rectifier discharge multiplexing conversion unit 102 shown is replaced by an uninterruptible circuit of a BOOST circuit; Figure 1 The battery charging circuit 103 shown is replaced by a battery charging circuit with an N line (such as Figure 2A As shown); an uninterruptible power supply in which the switching devices are replaced by contactors, SCRs, IGBTs, MOSFETs and other switching devices; an uninterruptible power supply in which at least one of the battery relays RLY7 to RLY9 and at least one of the battery relays RLY10 to RLY12 are provided (e.g., an uninterruptible power supply in which only RLY7 and RLY10 are provided).

[0052] When the rectifier-discharge multiplexing conversion unit 102 includes only one rectifier-discharge multiplexing circuit of the uninterruptible power supply, at least two battery relays are electrically connected between the two mains relays and the battery positive electrode BAT+ and the battery negative electrode BAT-. A circuit structure of the uninterruptible power supply is as follows Figure 2B As shown, the battery relay RLY7 is electrically connected between the second end of the AC relay RLY1 and the battery positive electrode BAT+, and the battery relay RLY8 is electrically connected between the second end of the AC relay RLY2 and the battery positive electrode BAT-. When any battery relay is short-circuited, a short circuit will also occur between the battery and the distribution transformer. The short-circuit circuit is similar to the aforementioned short-circuit circuit and will not be described in detail here.

[0053] Figure 3 This is a flow chart of a method for detecting and processing a fault of an uninterruptible power supply provided by the present application according to an exemplary embodiment, and the method is applied to an uninterruptible power supply including a rectifier-discharge multiplexing converter. The method includes:

[0054] S101. Obtain a current value of at least one sampling point to be measured in an uninterruptible power supply.

[0055] The sampling point to be tested is located in at least one fault circuit to be checked of the uninterruptible power supply, and each fault circuit to be checked includes at least one mains switch device and at least one battery switch device.

[0056] Among them, each fault loop to be inspected includes a mains switch device, a battery switch device electrically connected to the mains switch device, battery +, mains fuse Fuse1, a phase of electricity electrically connected to the mains switch device, neutral line N, bus capacitor C2, a freewheeling diode connected in anti-parallel with transistor Q15, inductor L8, charger relay RLY14, battery fuse Fuse5, battery -.

[0057] In one embodiment, the mains switch device and the battery switch device can be any one of the following: relay, contactor, SCR, IGBT, MOSFET. It can also be other switch devices, and no specific limitation is made here.

[0058] The device for sampling the current at the sampling point includes but is not limited to: current transformers, power resistors, Hall current sensors, shunts and other current detection devices. Among them, after placing the point to be detected inside the coil, the current transformer determines the current at the sampling point through the induced current, and the rest of the devices can be connected in series on the wire where the detection point is located, and determine the sampled current based on the corresponding generated electrical signal (such as: voltage value).

[0059] S102. When the current value is within the fault current range corresponding to the sampling point to be measured, determine that at least one switch device in the fault loop to be inspected is faulty.

[0060] When the uninterruptible power supply is operating normally and there is no short circuit in the switch device, the current values at each sampling point on the fault loop to be detected are all within their corresponding normal current ranges. When the current value exceeds the normal current range and enters the fault current range, it is determined that at least one switch device on the fault loop where the sampling point is located is faulty.

[0061] S103. Based on the faulty switch device, adjust the operating state of the rectification and discharge multiplexing circuit to cut off the fault loop where the faulty switch device is located.

[0062] As Figures 1 to 2C shown in the circuit structure, the rectification and discharge multiplexing circuit includes at least one group of rectification switch devices and a rectifier bridge. Each group of rectification switch devices includes two switch tubes connected in series. After each group of rectification switch devices is electrically connected to the midpoint of the corresponding rectifier bridge arm one by one, it is then coupled to the second end of the corresponding mains switch device (for example: in Figure 1 ), after switch tubes Q1 and Q2 are connected in series, they are electrically connected to the midpoint of the bridge arm composed of diode D1 and diode D4. This midpoint of the bridge arm is electrically connected to the second end of mains switch device RLY1 and the first end of battery switch device RLY7 through inductor L1).

[0063] Then each group of rectifier switch devices corresponds to each mains switch device, and a corresponding mains fuse is connected in series between the first end of each mains switch device and the mains input terminal to which it is coupled (for example: a mains fuse Fuse1 is connected in series between the mains switch device RLY1 and the U-phase electricity of the mains input terminal to which it is coupled).

[0064] The faulty switch device includes a faulty battery switch device or a faulty mains switch device.

[0065] When the mains switch device or the battery switch device fails, at least one group of rectifier switch devices corresponding to it is turned on to disconnect the corresponding fuse. The fuse includes a mains fuse or a battery fuse.

[0066] More specifically, when the uninterruptible power supply operates in the mains mode and it is determined that the battery switch device fails, one group of rectifier switch devices corresponding to the battery switch device is turned on to disconnect the mains fuse corresponding to the battery switch device;

[0067] When the uninterruptible power supply operates in the battery mode and it is determined that the mains switch device fails, at least one group of rectifier switch devices corresponding to the mains switch device is turned on to disconnect the battery fuse;

[0068] Among them, one group of rectifier switch devices corresponding to the battery switch device is one group of rectifier switch devices corresponding to the mains switch device electrically connected to the battery switch device;

[0069] The mains fuse corresponding to the battery switch device is the mains fuse electrically connected to the mains switch device electrically connected to the battery switch device;

[0070] At least one group of rectifier switch devices corresponding to the mains switch device includes the battery fuses electrically connected to the battery switch devices electrically connected to the mains switch device, and the battery fuses electrically connected to the other battery switch devices that are closed simultaneously with the battery switch device in the battery mode.

[0071] For example: when the uninterruptible power supply operates in the AC power mode, the AC power relay RLY1 is closed. If the battery relay RLY7 is short-circuited at this time, the short-circuit circuit includes: battery +, battery fuse Fuse4, battery relay RLY7, AC power relay RLY1, AC power fuse Fuse1, U phase electricity, neutral line N, bus capacitor C2, transistor Q15 anti-parallel freewheeling diode, inductor L8, charger relay RLY14, battery fuse Fuse5, battery -, and a fault circuit will be generated. After determining the faulty switching device, the switch tubes Q1 and Q2 coupled to the battery relay RLY7 and the AC power relay RLY1 are turned on to make the fault current pass through the circuit composed of the neutral line N, switch tubes Q1 and Q2, inductor L1, AC power relay RLY1, AC power fuse Fuse1 and U phase electricity. The large current in the circuit causes the AC power fuse Fuse1 to melt, so that the aforementioned fault circuit is interrupted.

[0072] As another example: when the uninterruptible power supply operates in battery mode, the battery relays RLY7 and RLY10 are closed. If the AC power relay RLY1 is short-circuited at this time, the short-circuit circuit is the same as above. After determining the faulty switching device, the switch tubes Q1 and Q2 coupled to the battery relay RLY7, and the switch tubes Q7 and Q8 coupled to the battery relay RLY10 are turned on to allow the fault current to pass through the circuit composed of battery +, battery fuse Fuse4, battery relay RLY7, inductor L1, switch tubes Q1, Q2, Q7, Q8, inductor L4, battery relay RLY10, battery fuse Fuse5, and battery -. The large current in the circuit causes the battery fuse Fuse4 and / or Fuse5 to melt, thereby interrupting the aforementioned fault circuit.

[0073] In the above technical solution, the current at at least one sampling point to be measured in at least one fault circuit to be checked in the uninterruptible power supply is sampled and compared with the corresponding fault current range to determine whether there is a fault device causing current abnormality in the fault circuit to be checked, and based on the faulty switching device, the operating state of the rectification and discharge multiplexing circuit is adjusted to cut off the fault circuit where the faulty switching device is located, so as to promptly terminate the influence of the fault current on the uninterruptible power supply and ensure the reliability of the power supply system.

[0074] The positions of the sampling points to be tested are different, and the corresponding fault judgment conditions of the switch devices are different. Figure 1 Taking the circuit structure shown as an example, the fault detection and processing method provided by the present application is explained through multiple embodiments with respect to the positions of different sampling points and the corresponding judgment conditions.

[0075] In one embodiment, the sampling point is the first end of the mains switch device to be tested, and whether the mains switch device or the battery relay is faulty is determined based on the current value passing through the mains switch device.

[0076] In one case, the setting position of the sampling point is as Figure 4 shown at point T, and the corresponding fault detection and processing method is as Figure 5 shown in steps S201 to S203 as follows:

[0077] S201. For each rectifying and discharging multiplexing unit, obtain the current value of the first end of the mains switch device to be measured among its corresponding three mains switch devices.

[0078] That is, obtain the current values of the mains switch devices electrically connected to the rectifying and discharging multiplexing units 1021 and 1022.

[0079] When the uninterruptible power supply operates in the mains mode, go to step S202; when the uninterruptible power supply operates in the battery mode, go to step S203.

[0080] S202. When the uninterruptible power supply operates in the mains mode and the absolute value of the current value of the first end of the mains switch device to be measured is greater than the first preset current value, determine that there is a fault in the battery switch device electrically connected to the mains switch device.

[0081] In the mains mode, the mains switch device is closed and the battery switch device is open. The current value of the mains switch device will not exceed the maximum input current of the rectifying and discharging multiplexing unit 1021 or 1022. Determine this current as the first preset current value. Then, when the current value of the mains switch device is greater than the first preset current value, determine that there is a fault current caused by a short circuit of the battery switch device, so that the controller turns on the rectifying switch device coupled to the faulty mains switch device (for example: when the battery switch device RLY8 is short-circuited, turn on the switching transistors Q1 and Q2), and fuse the mains fuse electrically connected to the mains switch device to interrupt the faulty circuit where the mains switch device is located.

[0082] S203. When the uninterruptible power supply operates in the battery mode and the absolute value of the current value of the first end of the mains switch device to be measured is greater than the second preset current value, determine that there is a fault in the mains switch device.

[0083] In the battery mode, the mains switch device is disconnected, and the battery switch device is closed. The current value of the mains switch device is 0, which is set as the second preset current value. Then, when the current value of the mains switch device is greater than the second preset current, it is determined that there is a fault current due to a short circuit of the mains switch device, so that the controller turns on the rectifier switch device coupled to the faulty battery switch device and the rectifier switch devices coupled to other battery switch devices that are turned on simultaneously, and fuses at least one battery fuse to interrupt the faulty circuit where the battery switch device is located. For example: when the mains switch device RLY1 fails, in the battery mode, if the battery switch devices RLY7 and RLY10 are in-phase switch devices and are closed simultaneously, then the switching transistors Q1, Q2, Q7, and Q8 are turned on simultaneously.

[0084] In another case, based on Figure 4 the sampling points shown, another fault detection and processing method is as shown in steps S301 to S304 in Figure 6 shown:

[0085] S301. When the rectifier and discharge multiplexing circuit includes at least two rectifier and discharge multiplexing units, obtain the current values of the first ends of at least one group of mains switch devices to be measured.

[0086] A group of mains switch devices includes each mains switch device coupled to the same-phase mains terminal. For example: RLY1 and RLY4, RLY2 and RLY5, RLY3 and RLY6.

[0087] Two mains switch devices in a group of mains switch devices are located in two fault circuits to be detected.

[0088] S302. For each group of mains switch devices, obtain the minimum value of the absolute values of the current values of each mains switch device within the current group of mains switch devices.

[0089] Compare the absolute values of the sampled current values of two mains switch devices in a group of mains switch devices to determine the minimum value.

[0090] Under normal circumstances, the current values of the two mains switch devices should be the same. When there is a fault current value, the absolute value of the current value of the mains switch device located in the fault circuit is greater than the absolute value of the current value of the other mains switch device.

[0091] When the uninterruptible power supply is operating in the mains mode, go to step S303; when the uninterruptible power supply is operating in the battery mode, go to step S304.

[0092] S303. When the uninterruptible power supply is operating in the mains mode and the difference between the absolute value of the current value of at least one mains switch device and the minimum value is greater than the first preset difference, determine that the battery switch device electrically connected to at least one mains switch device is faulty.

[0093] S304. When the uninterruptible power supply operates in the battery mode and the absolute value of the current value of at least one mains switch device differs from the minimum value by more than a second preset difference, it is determined that at least one mains switch device is faulty.

[0094] In this embodiment, the current operation is compared between the mains switch devices in the same phase or between the battery switch devices in the same phase. When the uninterruptible power supply operates normally, the absolute values of the current values passing through the switch devices in the same phase are the same. Only when a faulty current passes through, the absolute value of the current value of this switch device increases due to the faulty current, and its current value is greater than the current value of the switch device in the same phase that is not in the faulty loop. Then, during the current comparison process, the current value of the switch device not in the faulty loop is the above-mentioned minimum value, and the difference between the current value of the switch device in the faulty loop and the minimum value is greater than a first preset difference in the mains mode and greater than a second preset difference in the battery mode.

[0095] Considering the fluctuation of the current value, the first preset difference and the second preset difference are set to be greater than the maximum fluctuation current difference and less than the difference between the faulty current and the normal operating current.

[0096] After determining that the switch device is faulty, the controller turns on the rectifier switch device coupled to the faulty switch device, fuses the mains fuse in the faulty loop in the mains mode; and fuses the battery fuse in the faulty loop in the battery mode to interrupt the faulty loop where the switch device is located.

[0097] In another case, the setting position of the sampling point is as Figure 7 shown, and the corresponding fault detection and processing method is as Figure 8 shown in steps S401 - S403:

[0098] S401. Obtain the current value of the mains end coupled to the first end of the mains switch device to be measured.

[0099] This sampling point is set on the phase line. The sampling point located in the U phase is used to detect the fault conditions of the faulty loops where the mains switch devices RLY1 and RLY4 are located; the sampling point located in the V phase is used to detect the fault conditions of the faulty loops where the mains switch devices RLY2 and RLY5 are located; the sampling point located in the W phase is used to detect the fault conditions of the faulty loops where the mains switch devices RLY3 and RLY6 are located.

[0100] When the uninterruptible power supply operates in the mains mode, step S402 is entered; when the uninterruptible power supply operates in the battery mode, step S403 is entered.

[0101] S402. When the uninterruptible power supply is operating in the mains mode and the absolute value of the current value at the mains end is greater than the third preset current value, determine that at least one battery switch device corresponding to the mains end is faulty.

[0102] Among them, the battery switch device corresponding to the mains end is electrically connected to the mains switch device coupled to the mains end.

[0103] In one embodiment, the third preset current value is the absolute value of the maximum current that can flow through the phase line when the uninterruptible power supply is operating normally.

[0104] If the absolute value of the current on the U phase is greater than the third preset current, then the battery switch devices RLY7 and / or RLY10 are faulty. The fault judgment conditions for other phases are similar and will not be elaborated one by one.

[0105] S403. When the uninterruptible power supply is operating in the battery mode and the absolute value of the current value at the mains end is greater than the fourth preset current value, determine that at least one mains switch device coupled to the mains end is faulty.

[0106] Since the mains switch device is not closed when the uninterruptible power supply is operating in the battery mode, the current value passing through it is 0. In one embodiment, the fourth preset current value is set to 0.

[0107] If the absolute value of the current on the U phase is greater than the third preset current, then the mains switch devices RLY1 and / or RLY4 are faulty. The fault judgment conditions for other phases are similar and will not be elaborated one by one.

[0108] At this time, in the mains mode, the controller turns on the rectifier switch devices coupled to all the mains switch devices coupled to the mains end of this phase, so that the mains fuse connected to the mains end of this phase is blown to cut off the faulty circuit. For example: if it is determined that the U-phase electricity passes through the fault current, then in Figure 7 the shown circuit structure, turn on the switching tubes Q1, Q2 coupled to the mains switch device RLY1 and the switching tubes Q7, Q8 coupled to the mains switch device RLY4 to blow the mains fuse Fuse1.

[0109] In the battery mode, the controller turns on all the rectifier switch devices associated with the battery switch devices connected to the mains switch devices coupled to the mains end of this phase, so that the battery fuse is blown to cut off the faulty circuit. For example: if it is determined that the U-phase electricity passes through the fault current, then in Figure 7 the shown circuit structure, turn on the switching tubes Q1, Q2, Q7, Q8 coupled to the battery switch devices RLY7, RLY10 electrically connected to the mains switch devices RLY1, RLY4 to blow the battery fuses Fuse4, Fuse5.

[0110] In another embodiment, the sampling point is the second end of the battery switch device to be measured, and it is determined whether the mains switch device or the battery relay is faulty based on the current value passing through the battery switch device.

[0111] In one case, the setting position of the sampling point is as Figure 9 shown, and the corresponding fault detection and processing method is as Figure 10 shown in steps S501 to S503 as follows:

[0112] S501. For each rectification and discharge multiplexing unit, obtain the current value of the second end of the battery switch device to be measured among its corresponding three battery switch devices.

[0113] When the uninterruptible power supply operates in the mains mode, go to step S502; when the uninterruptible power supply operates in the battery mode, go to step S503.

[0114] S502. When the uninterruptible power supply operates in the mains mode and the absolute value of the current value of the second end of the battery switch device to be measured is greater than the fifth preset current value, it is determined that the battery switch device is faulty.

[0115] Since the battery switch device is not closed when the uninterruptible power supply operates in the mains mode, the current value passing through it is 0. In one embodiment, the fifth preset current value is set to 0.

[0116] S503. When the uninterruptible power supply operates in the battery mode and the absolute value of the current value of the second end of the battery switch device to be measured is greater than the sixth preset current value, it is determined that the mains switch device electrically connected to the battery switch device is faulty.

[0117] In one embodiment, the sixth preset current value is the absolute value of the maximum current that can flow through each battery switch device when the uninterruptible power supply operates normally in the battery mode.

[0118] This solution samples the current of each battery relay. In the mains mode, the battery switch device should be disconnected and no current will be detected. When the absolute value of the detected current is greater than the fifth preset current, it is determined that the battery switch device is short-circuited. The controller turns on the switch tube coupled to the mains switch device electrically connected to this battery switch device, so that the mains fuse electrically connected to this mains switch device blows to interrupt the faulty circuit where this switch device is located; in the battery mode, the battery switch device is closed, and the absolute value of the current value should be less than or equal to the sixth preset current value. When the mains switch device electrically connected to it is short-circuited, the absolute value of the current value of the battery switch device will increase, thereby determining that the mains switch device is faulty. The controller turns on the switch tubes coupled to this battery switch device and its in-phase battery switch devices, so that the battery fuse blows to interrupt the faulty circuit where this switch device is located.

[0119] In another case, based on Figure 9 the sampling points shown, another fault detection and processing method is as shown in Figure 11 the steps S601 to S604 shown:

[0120] S601. When the rectifying and discharging multiplexing circuit includes at least two rectifying and discharging multiplexing units, obtain the current values at the second ends of at least one set of battery switch devices to be measured.

[0121] Wherein, one set of battery switch devices includes two battery switch devices that are closed simultaneously in the battery mode to form a battery power supply loop. That is, one battery switch device electrically connected to the positive electrode of the battery and one battery switch device electrically connected to the negative electrode of the battery.

[0122] S602. For each set of battery switch devices, calculate the absolute value of the sum of the current value at the second end of the first battery switch device and the current value at the second end of the second battery switch device within this set of battery switch devices.

[0123] When the uninterruptible power supply operates in the mains mode, go to step S603; when the uninterruptible power supply operates in the battery mode, go to step S604.

[0124] S603. When the uninterruptible power supply operates in the mains mode and the absolute value of the sum of the current values is greater than the seventh preset current value, determine that the first battery switch device and / or the second battery switch device is faulty.

[0125] S604. When the uninterruptible power supply operates in the battery mode and the absolute value of the sum of the current values is greater than the eighth preset current value, determine that at least one mains switch device electrically connected to this set of battery switch devices is faulty.

[0126] In this solution, in the battery mode, the current values of one set of battery switch devices should be equal in magnitude and opposite in direction, and the sum of the corresponding detected current values should be 0. When the mains switch device electrically connected to any battery switch device is short-circuited, the sum of the current values of this battery switch device is no longer 0, thereby determining that the battery switch device is faulty. In one embodiment, the seventh preset current value is set to 0.

[0127] In the mains mode, the battery switch device is disconnected, and the sum of the sampled currents is 0. When the sampled current value is non-0, it is determined that the battery switch device is faulty. In one embodiment, the eighth preset current value is determined to be 0.

[0128] After determining the set of switch devices with faults, in the mains mode, the controller turns on the rectifying switch device coupled to this set of mains switch devices and fuses the mains fuse corresponding to this switch device. In the battery mode, the controller turns on the rectifying switch device coupled to this set of battery switch devices and fuses the battery fuse to interrupt the faulty loop where this switch device is located.

[0129] In another embodiment, the sampling point is on the wire between the battery switch device and the battery, and it is determined whether the mains switch device or the battery relay electrically connected to the wire is faulty based on the current value on the wire.

[0130] In one case, the setting position of the sampling point is as Figure 12 shown, and the corresponding fault detection and processing method is as Figure 13 shown in steps S701 to S704 as follows:

[0131] S701. Obtain the current values on the third wire and the fourth wire.

[0132] The third wire and the fourth wire are the wires electrically connected between the second ends of each battery switch device after being connected to a point and point A or point B. In one case, as Figure 12 shown, the left longitudinal wire of the sampling point T is set as the third wire, and the right longitudinal wire of the sampling point T is set as the fourth wire.

[0133] S702. Calculate the absolute value of the sum of the current value on the third wire and the current value on the fourth wire.

[0134] When the uninterruptible power supply operates in the mains mode, go to step S703; when the uninterruptible power supply operates in the battery mode, go to step S704.

[0135] S703. When the uninterruptible power supply operates in the mains mode and the absolute value of the sum of the current values is greater than the ninth preset current value, determine that the first battery switch device and / or the second battery switch device is faulty.

[0136] S704. When the uninterruptible power supply operates in the battery mode and the absolute value of the sum of the current values is greater than the tenth preset current value, determine that at least one mains switch device electrically connected to the first battery switch device and / or the second battery switch device is faulty.

[0137] Similar to the embodiment shown in steps S601 to S604, in the mains mode, there is no current on the third wire and the fourth wire, and the sum of the currents is 0. When a non-zero current value is detected, it is determined that at least one of the six battery switch devices is faulty. In one embodiment, the ninth preset current value is set to 0; in the battery mode, the current magnitudes on the third wire and the fourth wire are equal and the directions are opposite. When a non-zero sum of the current values is detected, it is determined that at least one of the six mains switch devices is faulty. In another embodiment, the tenth preset current value is set to 0.

[0138] In this embodiment, when it is determined that the absolute value of the sum of the current values on the third wire and the fourth wire is greater than the ninth preset current value or the tenth preset current value, all rectifier switch devices corresponding to the battery switch devices electrically connected to the third wire and the fourth wire are controlled to conduct, so that in the mains mode, the mains fuses corresponding to the faulty switch devices are blown; in the battery mode, the battery fuses are blown.

[0139] In another case, the setting position of the sampling point is as Figure 14 shown, and the corresponding fault detection and handling method is as Figure 15 shown in steps S801 to S804 as follows:

[0140] S801. When the uninterruptible power supply includes at least two uninterruptible power supply modules, obtain the current values on the first wire and / or the second wire in each uninterruptible power supply module.

[0141] S802. Obtain the maximum normal operating current of the uninterruptible power supply module.

[0142] When the uninterruptible power supply operates in the mains mode, go to step S803; when the uninterruptible power supply operates in the battery mode, go to step S804.

[0143] S803. For each uninterruptible power supply module, when the uninterruptible power supply module operates in the mains mode and the absolute value of the current value on the target wire is greater than the maximum normal operating current, determine that at least one battery switch device electrically connected to the target wire is faulty.

[0144] S804. For each uninterruptible power supply module, when the uninterruptible power supply module operates in the battery mode and the absolute value of the current value on the target wire is greater than the maximum normal operating current, determine that at least one mains switch device electrically connected to the target wire is faulty.

[0145] In this solution, the detection points are set on the first wire between point A and the power supply + and the second wire between point B and the power supply - in each uninterruptible power supply module. When there is no faulty loop, the current values at the two points in the uninterruptible power supply module are equal in magnitude and opposite in direction, and the absolute values of the current values at the two points are both less than the maximum normal operating current.

[0146] When there is a fault, the currents on the same type of wires in other uninterruptible power supply modules all pass through the wires of the faulty uninterruptible module, resulting in an increase in the absolute value of the current on this wire.

[0147] For example: When at least one of the mains switch devices RLY1 to RLY3 in the uninterruptible power supply module 00 has a fault (such as RLY1), when the uninterruptible power supply operates in battery mode, a fault loop will be generated: battery +, battery relay RLY7 in the uninterruptible power supply module 00, mains relay RLY1 in the uninterruptible power supply module 00, mains fuse Fuse1 in the uninterruptible power supply module 00, U-phase power, neutral line N, bus capacitor C2 in the uninterruptible power supply modules 00 and 01, freewheeling diode anti-parallel to transistor Q15 in the uninterruptible power supply modules 00 and 01, inductor L8 in the uninterruptible power supply modules 00 and 01, charger relay RLY14 in the uninterruptible power supply modules 00 and 01, battery fuse Fuse5 in the uninterruptible power supply modules 00 and 01, battery -. Then, under normal operation, the current value on the first wire of each uninterruptible power supply module is +XA, and the current value on the second wire is -XA, where X is the current value. After there is a faulty switch device in the uninterruptible power supply module 00, the current value on the first wire in the uninterruptible power supply module 00 is +2XA, the current value on the second wire is -XA, the current value on the first wire in the uninterruptible power supply module 01 is 0A, and the current value on the second wire is -XA. Set the maximum normal operating current to a current value between XA and 2XA, then based on this maximum normal operating current, it is determined that the switch device connected to the first wire in the uninterruptible power supply module 00 has a fault.

[0148] In this embodiment, when it is determined that the absolute value of the current on the first wire or the second wire is greater than the maximum normal operating current, control the rectifier switch devices corresponding to all the battery switch devices electrically connected to this wire to conduct, so as to fuse the mains fuse corresponding to the faulty switch device in mains mode; and fuse the battery fuse in battery mode.

[0149] Continue to refer to Figure 14 , and its corresponding fault detection and handling method is also as Figure 16 shown in steps S901 to S904:

[0150] S901. When the uninterruptible power supply includes at least three uninterruptible power supply modules, obtain the current values on the first wire and the second wire in each uninterruptible power supply module.

[0151] S902. Calculate the sum of the currents on the first wire and the second wire in each uninterruptible power supply module.

[0152] S903. When the sum of the currents is greater than the first preset sum of currents, determine that at least one switch device coupled to this first wire is faulty.

[0153] When the sum of currents is greater than the first preset sum of currents, there are two cases to determine a switch device failure:

[0154] When the uninterruptible power supply operates in the mains mode, determine that at least one battery switch device connected to the first wire fails;

[0155] When the uninterruptible power supply operates in the battery mode, determine that at least one mains switch device connected to the first wire fails.

[0156] S904. When the sum of currents is less than the second preset sum of currents, determine that at least one switch device coupled to the second wire fails.

[0157] When the sum of currents is less than the second preset sum of currents, there are also two cases to determine a switch device failure:

[0158] When the uninterruptible power supply operates in the mains mode, determine that at least one battery switch device connected to the second wire fails;

[0159] When the uninterruptible power supply operates in the battery mode, determine that at least one mains switch device connected to the second wire fails.

[0160] In this embodiment, when a fault occurs in the uninterruptible power supply module, the fault loop existing therein is similar to the Figure 15 fault loop described in the corresponding embodiment. The sum of the current values of the wires connected to the faulty switch device passing through all the wires of the same type in the uninterruptible power supply module, and the current value on the other type of wire remains unchanged. Taking the uninterruptible power supply including three uninterruptible power supply modules as an example, the fault detection and processing method provided in this embodiment will be explained below. The three uninterruptible power supply modules include: uninterruptible power supply module 00, uninterruptible power supply module 01, and uninterruptible power supply module 02.

[0161] Set the current on the first wire electrically connected to the positive electrode of the battery as the forward current, and the current on the second wire electrically connected to the negative electrode of the battery as the reverse current. Under normal operating conditions, the current value on the first wire of each uninterruptible power supply module is +XA, and the current value on the second wire is -XA, where X is the current value. When the battery relay RLY7 in the uninterruptible power supply module 00 fails, during the operation of the uninterruptible power supply, the current value on the first wire in the uninterruptible power supply module 00 is +3XA, the current values on the first wires in the uninterruptible power supply modules 01 and 02 are 0A, and the current values on the second wires in the three uninterruptible power supply modules are all -XA. Then, for the uninterruptible power supply module 00, the sum of the current values on the first wire and the second wire is +2XA, and for the uninterruptible power supply modules 01 and 02, the sum of the current values on the first wire and the second wire is -XA. Set the first preset current sum to be greater than +XA and less than +2XA, then it is determined that at least one switching device coupled to the first wire in the uninterruptible power supply module 00 fails, and it is necessary to turn on the rectifier switching devices corresponding to all the switching devices coupled thereto so that the fuse corresponding to the faulty switching device blows, where the fuse blowing situation is the same as that of Figure 15 the embodiment shown, which will not be elaborated here.

[0162] Similarly, when at least one mains switching device or battery switching device coupled to the second wire in the uninterruptible power supply module 00 fails, the current value on the second wire in the uninterruptible power supply module 00 is -3XA, the current value on the first wire is +XA, the current values on the second wires in other uninterruptible power supply modules are 0A, and the current values on the first wires are +XA. For the uninterruptible power supply module 00, the sum of the current values on the first wire and the second wire is -2XA, and for the uninterruptible power supply modules 01 and 02, the sum of the current values on the first wire and the second wire is +XA. Set the second preset current sum to be greater than -2XA and less than -XA, then it is determined that at least one switching device coupled to the second wire in the uninterruptible power supply module 00 fails, and it is necessary to turn on the rectifier switching devices corresponding to all the switching devices coupled thereto so that the fuse corresponding to the faulty switching device blows, where the fuse blowing situation is the same as that of Figure 15 the embodiment shown, which will not be elaborated here.

[0163] Figure 17 FIG. 11 is a schematic structural diagram of a fault detection and processing device for an uninterruptible power supply according to an embodiment of the present application. The fault detection device 400 of the uninterruptible power supply includes an acquisition module 401 and a processing module 402, where,

[0164] An acquisition module 401 is configured to acquire current values of at least one sampling point to be measured in an uninterruptible power supply; the sampling points to be measured are located in at least one fault loop to be checked in the uninterruptible power supply, and each fault loop to be checked includes at least one mains switch device and at least one battery switch device;

[0165] A processing module 402 is configured to determine that at least one switch device in the fault loop to be checked is faulty when the current value is within the fault current range corresponding to the sampling point to be measured.

[0166] The processing module 402 is further configured to adjust the operating state of the rectifier and discharge multiplexing circuit based on the faulty switch device to cut off the fault loop where the faulty switch device is located.

[0167] Figure 18 This is a schematic structural diagram of a controller provided by an embodiment of the present application. Among them, the controller 500 includes a memory 501 and a processor 502. The memory 501 is used to store computer instructions executable by the processor. The memory 501 may include a high-speed random access memory (Random Access Memory, RAM), and may also include non-volatile storage (Non-Volatile Memory, NVM), such as at least one disk memory, and may also be a USB flash drive, a mobile hard disk, a read-only memory, a magnetic disk or an optical disc, etc.

[0168] When the processor 502 executes the computer instructions, it implements each step in the fault detection and processing method of the uninterruptible power supply with the controller as the execution entity in the above embodiment. Specifically, reference can be made to the relevant descriptions in the foregoing method embodiments. The processor 502 may be a central processing unit (Central Processing Unit, CPU), and may also be other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), application-specific integrated circuits (ApplicationSpecific Integrated Circuit, ASIC), etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The steps of the method disclosed in combination with the invention can be directly implemented by the execution of the hardware processor, or can be implemented by the combination of the hardware and software modules in the processor.

[0169] Optionally, the above-mentioned memory 501 can be either independent or integrated with the processor 502. When the memory 501 is independently provided, the controller 500 further includes a bus for connecting the memory 501 and the processor 502. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, the buses in the drawings of this application are not limited to only one bus or one type of bus.

[0170] An embodiment of the present application further provides a computer-readable storage medium. Computer instructions are stored in the computer-readable storage medium. When the processor executes the computer instructions, each step of the fault detection and processing method of the uninterruptible power supply in the above-mentioned embodiment is implemented.

[0171] An embodiment of the present application further provides a computer program product, including computer instructions. When the computer instructions are executed by the processor, each step of the fault detection and processing method of the uninterruptible power supply in the above-mentioned embodiment is implemented.

[0172] Those skilled in the art will readily think of other implementation manners of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include common general knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and the embodiments are only regarded as exemplary, and the true scope and spirit of the present application are pointed out by the following claims.

[0173] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

Claims

1. A method for detecting and handling faults of an uninterruptible power supply, characterized in that, The method is applied to an uninterruptible power supply (UPS). The UPS includes at least one uninterruptible power supply module. Each uninterruptible power supply module includes: a rectification and discharge multiplexing circuit, a battery, at least one mains switch device, and at least one battery switch device. The first end of each mains switch device is coupled to the mains input end of the UPS, and the second end is electrically connected to the rectification and discharge multiplexing circuit and the first end of a corresponding battery switch device. The second end of the battery switch device is coupled to the battery. The method includes: Obtaining the current value of at least one to-be-measured sampling point in the UPS. The to-be-measured sampling point is located in at least one to-be-checked fault loop of the UPS. Each to-be-checked fault loop includes at least one mains switch device and at least one battery switch device. When the current value is within the fault current range corresponding to the to-be-measured sampling point, determining that at least one switch device in the to-be-checked fault loop is faulty. Based on the faulty switch device, adjusting the operating state of the rectification and discharge multiplexing circuit to cut off the fault loop where the faulty switch device is located.

2. The method according to claim 1, characterized in that The rectification and discharge multiplexing circuit includes at least one group of rectification switch devices. Each group of rectification switch devices corresponds to one of the mains switch devices. A corresponding mains fuse is connected in series between the first end of each mains switch device and the mains input end coupled thereto. A corresponding battery fuse is connected in series between the second end of each battery switch device and the battery coupled thereto. Adjusting the operating state of the rectification and discharge multiplexing circuit to cut off the fault loop where the faulty switch device is located, based on the faulty switch device, includes: When the UPS operates in the mains mode and it is determined that the battery switch device is faulty, turning on a group of rectification switch devices corresponding to the battery switch device to disconnect the corresponding mains fuse of the battery switch device. When the UPS operates in the battery mode and it is determined that the mains switch device is faulty, turning on at least one group of rectification switch devices corresponding to the mains switch device to disconnect the battery fuse. Wherein, a group of rectification switch devices corresponding to the battery switch device is a group of rectification switch devices corresponding to the mains switch device electrically connected to the battery switch device. The mains fuse corresponding to the battery switch device is the mains fuse electrically connected to the mains switch device electrically connected to the battery switch device. At least one group of rectification switch devices corresponding to the mains switch device includes the battery fuse electrically connected to the battery switch device electrically connected to the mains switch device, and the battery fuses electrically connected to other battery switch devices that are closed simultaneously with the battery switch device in the battery mode.

3. The method according to claim 1 or 2, characterized in that, The rectification and discharge multiplexing circuit includes at least one rectification and discharge multiplexing unit. The mains input end includes a three-phase mains end. Each rectification and discharge multiplexing unit is provided with three input ends. The three input ends are electrically connected to the second ends of corresponding three mains switch devices. The first ends of the three mains switch devices are respectively coupled to the mains ends of corresponding phases. Obtaining the current value of at least one to-be-measured sampling point in the UPS includes: Obtain the current value of the first end of the mains switch device to be measured.

4. The method according to claim 3, wherein: Obtaining the current value of the first end of the mains switch device to be measured includes: For each of the rectifying and discharging multiplexing units, obtain the current value of the first end of the mains switch device to be measured among the corresponding three mains switch devices.

5. The method according to claim 4, wherein When the current value is within the fault current range corresponding to the sampling point to be measured, determining that at least one switch device in the fault loop to be inspected is faulty includes: When the uninterruptible power supply operates in the mains mode and the absolute value of the current value of the first end of the mains switch device to be measured is greater than a first preset current value, determine that the battery switch device electrically connected to the mains switch device is faulty; When the uninterruptible power supply operates in the battery mode and the absolute value of the current value of the first end of the mains switch device to be measured is greater than a second preset current value, determine that the mains switch device is faulty.

6. The method according to claim 4, wherein Obtaining the current value of the first end of the mains switch device to be measured includes: When the rectifying and discharging multiplexing circuit includes at least two rectifying and discharging multiplexing units, obtain the current values of the first ends of at least one group of mains switch devices to be measured; a group of mains switch devices includes the mains switch devices coupled to the same-phase mains terminal.

7. The method according to claim 6, characterized in that, When the current value is within the fault current range corresponding to the sampling point to be measured, determining that at least one switch device in the fault loop to be inspected is faulty includes: For each group of mains switch devices, obtain the minimum value of the absolute values of the current values of the mains switch devices within the group; When the uninterruptible power supply operates in the mains mode and the difference between the absolute value of the current value of at least one mains switch device and the minimum value is greater than a first preset difference, determine that the battery switch device electrically connected to the at least one mains switch device is faulty; When the uninterruptible power supply operates in the battery mode and the difference between the absolute value of the current value of at least one mains switch device and the minimum value is greater than a second preset difference, determine that the at least one mains switch device is faulty.

8. The method according to claim 3, characterized in that, Obtaining the current value of the first end of the mains switch device to be measured includes: Obtain the current value of the mains terminal coupled to the first end of the mains switch device to be measured.

9. The method according to claim 8, wherein When the current value is within the fault current range corresponding to the sampling point to be measured, determining that at least one switch device in the fault loop to be inspected is faulty includes: When the uninterruptible power supply operates in the mains mode and the absolute value of the current value of the mains terminal is greater than a third preset current value, determine that at least one battery switch device corresponding to the mains terminal is faulty, wherein the battery switch device corresponding to the mains terminal and the mains switch device coupled to the mains terminal are electrically connected; When the uninterruptible power supply operates in the battery mode and the absolute value of the current value of the mains terminal is greater than a fourth preset current value, determine that at least one mains switch device coupled to the mains terminal is faulty.

10. The method according to claim 1 or 2, characterized in that, The rectification and discharge multiplexing circuit comprises at least one rectification and discharge multiplexing unit, each of the rectification and discharge multiplexing units is provided with three input terminals, the three input terminals are electrically connected to the first terminals of the corresponding three battery switch devices, and the second terminals of the three battery switch devices are electrically connected to the positive electrode or the negative electrode of the battery; Obtaining a current value of at least one sampling point to be measured in the uninterruptible power supply includes: The current value of the second terminal of the battery switch device to be tested is obtained.

11. The method according to claim 10, wherein Obtaining a current value of a second terminal of a battery switch device to be tested, comprising: For each of the rectifying and discharging multiplexing units, the current value of the second end of the battery switch device to be tested among the three corresponding battery switch devices is obtained.

12. The method according to claim 11, wherein When the current value is within the fault current range corresponding to the sampling point to be tested, determining that at least one switch device in the fault circuit to be checked is faulty, comprises: When the uninterruptible power supply operates in the mains mode and the absolute value of the current value at the second end of the battery switch device to be tested is greater than a fifth preset current value, determining that the battery switch device has a fault; When the uninterruptible power supply operates in battery mode and the absolute value of the current value at the second end of the battery switch device to be tested is greater than a sixth preset current value, it is determined that a mains switch device electrically connected to the battery switch device has a fault.

13. The method according to claim 10, characterized in that, Obtaining a current value of a second terminal of a battery switch device to be tested, comprising: When the rectification and discharge multiplexing circuit includes at least two rectification and discharge multiplexing units, the current value of the second end of at least one group of battery switching devices to be measured is obtained; a group of battery switching devices includes a first battery switching device electrically connected to the positive electrode of the battery and a second battery switching device electrically connected to the negative electrode of the battery.

14. The method according to claim 13, wherein When the current value is within the fault current range corresponding to the sampling point to be tested, determining that at least one switch device in the fault circuit to be checked is faulty, comprises: For each group of cell switch devices, calculating an absolute value of a sum of a current value at a second end of a first cell switch device and a current value at a second end of a second cell switch device in the group of cell switch devices; When the uninterruptible power supply operates in a mains mode and the absolute value of the sum of the current values is greater than a seventh preset current value, determining that the first battery switch device and / or the second battery switch device is faulty; When the uninterruptible power supply operates in battery mode and the absolute value of the sum of the current values is greater than an eighth preset current value, it is determined that at least one mains switching device electrically connected to the battery switching device group is faulty.

15. The method according to claim 10, characterized in that, The uninterruptible power supply module further includes a battery charging circuit, wherein the positive electrode of the battery is electrically connected to a first end of the battery charging circuit via a first wire, the negative electrode of the battery is electrically connected to a second end of the battery charging circuit via a second wire, the second end of at least one first battery switching device is electrically connected to a first end point, the first end point is electrically connected to any point on the first wire via a third wire, the second end of at least one second battery switching device is electrically connected to a second end point, and the second end point is electrically connected to any point on the second wire via a fourth wire; Obtaining a current value of a second terminal of a battery switch device to be tested, comprising: Obtain the current values on the third wire and the fourth wire; The at least one first battery switch device or the at least one second battery switch device includes the battery switch device to be tested.

16. The method according to claim 15, characterized in that, When the current value is within the fault current range corresponding to the to-be-tested sampling point, determining that at least one switch device in the to-be-checked fault loop is faulty includes: Calculate the absolute value of the sum of the current value on the third wire and the current value on the fourth wire; When the uninterruptible power supply operates in the mains mode and the absolute value of the sum of the current values is greater than the ninth preset current value, determine that the first battery switch device and / or the second battery switch device is faulty; When the uninterruptible power supply operates in the battery mode and the absolute value of the sum of the current values is greater than the tenth preset current value, determine that at least one mains switch device electrically connected to the first battery switch device and / or the second battery switch device is faulty.

17. The method according to claim 1 or 2, characterized in that, The uninterruptible power supply module further includes a battery charging circuit. The positive electrode of the battery is electrically connected to the first end of the battery charging circuit through a first wire, the negative electrode of the battery is electrically connected to the second end of the battery charging circuit through a second wire. The second end of the at least one first battery switch device is electrically connected to a first endpoint, the first endpoint is electrically connected to any point on the first wire through a third wire, the second end of the at least one second battery switch device is electrically connected to a second endpoint, and the second endpoint is electrically connected to any point on the second wire through a fourth wire; Obtain the current value of at least one to-be-tested sampling point in the uninterruptible power supply, including: When the uninterruptible power supply includes at least two uninterruptible power supply modules, obtain the current value on the first wire and / or the second wire in each of the uninterruptible power supply modules.

18. The method according to claim 17, characterized in that, When the current value is within the fault current range corresponding to the to-be-tested sampling point, determining that at least one switch device in the to-be-checked fault loop is faulty includes: Obtain the maximum normal operating current of the uninterruptible power supply module; For each of the uninterruptible power supply modules, when the uninterruptible power supply module operates in the mains mode and the absolute value of the current value on the target wire is greater than the maximum normal operating current, determine that at least one battery switch device electrically connected to the target wire is faulty; For each of the uninterruptible power supply modules, when the uninterruptible power supply module operates in the battery mode and the absolute value of the current value on the target wire is greater than the maximum normal operating current, determine that at least one mains switch device electrically connected to the target wire is faulty; The target wire includes the first wire or the second wire.

19. The method according to claim 17, wherein Set the current on the first wire as the forward current and the current on the second wire as the reverse current; When the current value is within the fault current range corresponding to the to-be-tested sampling point, determining that at least one switch device in the to-be-checked fault loop is faulty includes: When the uninterruptible power supply includes at least three uninterruptible power supply modules and the current values on the first wire and the second wire in each of the uninterruptible power supply modules are obtained, calculate the sum of the currents on the first wire and the second wire in each of the uninterruptible power supply modules; When the sum of the currents is greater than the first preset sum of currents, determine that at least one switching device coupled to the first wire is faulty; When the sum of the currents is less than the second preset sum of currents, determine that at least one switching device coupled to the second wire is faulty, where the switching device includes the mains switching device or the battery switching device.

20. A fault detection and processing device for an uninterruptible power supply, characterized in that, Comprising: An acquisition module, configured to acquire current values of at least one sampling point to be measured in the uninterruptible power supply; the sampling point to be measured is located in at least one fault loop to be checked in the uninterruptible power supply, and each fault loop to be checked includes at least one mains switching device and at least one battery switching device; A processing module, configured to determine that at least one switching device in the fault loop to be checked is faulty when the current value is within the fault current range corresponding to the sampling point to be measured; The processing module is further configured to adjust the operating state of the rectification and discharge multiplexing circuit based on the faulty switching device to cut off the fault loop where the faulty switching device is located.

21. A controller, characterized in that, Comprising: A processor and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor is configured to implement the method according to any one of claims 1 to 19 when executing the computer-executable instructions.

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