Zero-excessive power type uninterruptible power supply system, control method thereof, equipment and medium

Abstract

The embodiment of the invention provides a zero-excessive power type uninterruptible power supply system, a control method thereof, equipment and a medium, and belongs to the technical field of power distribution. The system comprises a multi-input loop, an output bus, a central control unit and a static power conversion device, the multi-input loop comprises a main power supply loop and a standby power supply loop, and the static power conversion device comprises a first switch group and a second switch group; the main power supply loop is connected with the output bus through the first switch group, and the standby power supply loop is connected with the output bus through the second switch group; a microprocessor is embedded in the central control unit and is used for detecting the action time of the static power conversion device and checking the alternating current zero crossing point moment; the central control unit is respectively connected with the first switch group and the second switch group, and when the main power supply loop fails, the central control unit controls the first switch group to be switched off at the alternating current zero crossing point moment according to the action time and controls the second switch group to be switched on at the alternating current zero crossing point moment. The scheme does not depend on a storage battery, and the power guarantee cost can be reduced.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a zero-overcurrent uninterruptible power supply system and a control method, device and medium thereof. Background Art

[0002] A traditional uninterruptible power supply (UPS) is a device that can continuously supply power to the load. When the AC power input is normal, the UPS stabilizes the AC power and supplies it to the load. At this time, the UPS is an AC voltage stabilizer. When the AC power is interrupted (power outage), the battery discharges immediately and converts DC power into AC power, providing uninterrupted power supply to the load, thereby protecting the equipment from power fluctuations or interruptions.

[0003] Most UPS on the market are energy storage type, relying on electrochemical energy storage batteries as backup power sources. Limited by the capacity and life of the batteries, UPS cannot provide high-power, long-term power supply, and regular replacement of batteries will increase periodic and ongoing costs. In addition, batteries with limited lifespans are highly polluting products, and the large amount of solid waste generated after disposal also requires a large amount of solid waste treatment costs. Moreover, as a power electronic product, UPS has weak environmental adaptability and durability, and needs to maintain a specific working environment. If damaged, it needs to be replaced, which not only further increases costs, but also reduces power supply safety. Summary of the invention

[0004] The main purpose of the embodiments of the present application is to propose a zero-overcurrent uninterruptible power supply system and its control method, equipment and medium, aiming to utilize the power circuit to provide stable power without relying on batteries, reduce power supply costs, and improve durability and power supply safety.

[0005] To achieve the above-mentioned purpose, one aspect of an embodiment of the present application provides a zero-overcurrent uninterruptible power supply system, the zero-overcurrent uninterruptible power supply system comprising multiple input circuits, an output bus, a central control unit and a static power conversion device;

[0006] The multi-input circuit includes a main power supply circuit and a backup power supply circuit, and the multi-input circuit is used to obtain AC power from the power supply side;

[0007] The static power conversion device comprises a first switch group and a second switch group, wherein the first switch group and the second switch group comprise a plurality of switches; the static power conversion device is any one of a mechanical contactor or a relay, and is used to ensure safe electrical isolation during the power switching process;

[0008] The main power supply circuit and the backup power supply circuit are connected in parallel to the output bus, wherein the main power supply circuit is connected to the output bus through the first switch group, and the backup power supply circuit is connected to the output bus through the second switch group, and the output bus is used to supply power to the load side;

[0009] A microprocessor is embedded in the central control unit, and the microprocessor is used to detect the action time of each switch of the static power conversion device and calculate the AC zero-crossing time required for predictive control of each switch;

[0010] The central control unit is connected to the first switch group and the second switch group respectively. The central control unit is used to control the first switch group to disconnect at the AC zero-crossing point according to the action time when the main power supply circuit fails, and control the second switch group to close at the AC zero-crossing point.

[0011] In some embodiments, the power supply side includes grid power, green power, power output by an energy storage inverter, or power output by a local generator.

[0012] In some embodiments, each input end of the multi-input circuit is provided with a power circuit breaker, and the power circuit breaker is used for short-circuit protection of the power supply side;

[0013] Each of the multiple input circuits is embedded with a voltage transformer, which dynamically detects the voltage state and uses the voltage state as feedback information for relay protection and power supply side health status diagnosis;

[0014] Each line on the load side is provided with a current transformer, which dynamically detects the current state and uses the current state as feedback information for relay protection.

[0015] In some embodiments, the zero-overcurrent uninterruptible power supply system further comprises a local display connected to the microprocessor;

[0016] The microprocessor is also used to dynamically detect the power operation parameters of each of the multiple input circuits, and to make online analysis and control decisions based on the power operation parameters, wherein the power operation parameters include voltage, current, power, power factor and temperature;

[0017] The on-site display is used to display the numerical value and process curve of the power operation parameter, and at the same time display the online operation status of the zero-overcurrent type uninterruptible power supply system;

[0018] The local display is also used to display the values ​​of preset parameters, wherein the preset parameters include relay protection parameters, switching condition parameters and extreme state parameters.

[0019] In some embodiments, the zero-overcurrent uninterruptible power supply system further includes a network communication unit and a cloud management platform, wherein the network communication unit is connected to the central control unit, and the cloud management platform performs information exchange with the network communication unit;

[0020] The cloud management platform is used to actively send a circuit switching instruction;

[0021] The network communication unit is used to receive the circuit switching instruction and send the circuit switching instruction to the central control unit;

[0022] The central control unit responds to the loop switching instruction, controls the first switch group to be disconnected at the AC zero crossing moment according to the action time, and controls the second switch group to be closed at the AC zero crossing moment, or controls the second switch group to be disconnected at the AC zero crossing moment according to the action time, and controls the first switch group to be closed at the AC zero crossing moment.

[0023] In some embodiments, when the alternating current is three-phase electricity, the central control unit is also used to predict the alternating current zero-crossing moment of each phase in phase, and switch between the multiple input circuits in phase at the alternating current zero-crossing moment.

[0024] In some embodiments, when there are multiple power transformers supplying power on the power supply side, the central control unit is also used to dynamically control the zero-overload uninterruptible power supply system to switch to the side with the largest load of the power transformer according to the load rate of the multiple power transformers when the load of the power transformers is unbalanced, so as to enable the load to be continuously transferred between the multiple power transformers to maintain load balance.

[0025] To achieve the above object, another aspect of the embodiment of the present application provides a control method for a zero-overcurrent uninterruptible power supply system, which is applied to any of the above-mentioned zero-overcurrent uninterruptible power supply systems, and the control method comprises the following steps:

[0026] Obtain AC power from the power supply side through multiple input circuits;

[0027] The microprocessor detects the action time of each switch of the static power conversion device and calculates the AC zero-crossing time required for predictive control of each switch;

[0028] When the main power supply circuit fails, the central control unit controls the first switch group to be disconnected at the AC zero-crossing point according to the action time, and controls the second switch group to be closed at the AC zero-crossing point.

[0029] To achieve the above-mentioned purpose, another aspect of an embodiment of the present application provides an electronic device, the electronic device comprising a memory and a processor, the memory storing a computer program, and the processor implementing the above-mentioned control method when executing the computer program.

[0030] To achieve the above-mentioned purpose, another aspect of an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program implements the above-mentioned control method when executed by a processor.

[0031] The embodiments of the present application include at least the following beneficial effects: the present application provides a zero-overcurrent uninterruptible power supply system and a control method, device and medium thereof, the system comprising a multi-input circuit, an output bus, a central control unit and a static power conversion device; the multi-input circuit comprises a main power supply circuit and a backup power supply circuit, and the multi-input circuit is used to obtain AC power from the power supply side; the static power conversion device comprises a first switch group and a second switch group, wherein the first switch group and the second switch group comprise a plurality of switches; the static power conversion device is any one of a mechanical contactor or a relay, used to ensure safe electrical isolation of the power switching process; the main power supply circuit and the backup power supply circuit are connected to the power supply circuit of the central control unit and the static power conversion device is ... The circuit is connected in parallel to the output bus, wherein the main power supply circuit is connected to the output bus through the first switch group, and the standby power supply circuit is connected to the output bus through the second switch group, and the output bus is used to supply power to the load side; a microprocessor is embedded in the central control unit, and the microprocessor is used to detect the action time of each switch of the static power conversion device and calculate the AC zero-crossing time required for the predictive control of each switch; the central control unit is connected to the first switch group and the second switch group respectively, and the central control unit is used to control the first switch group to disconnect at the AC zero-crossing time according to the action time when the main power supply circuit fails, and control the second switch group to close at the AC zero-crossing time. This scheme utilizes the characteristics of large power circuit capacity and continuous and stable power supply, and can get rid of the current situation that the power uninterruptible power supply relies on battery energy storage, more reliably guarantee uninterruptible power supply, and does not need to replace batteries periodically, reducing the power guarantee cost; at the same time, the static power conversion device is used to isolate the circuit, and the AC zero-crossing measurement and control technology is combined to control the circuit switching, so as to achieve zero-overswitching, protect the power load from switching shock, and improve the durability and power supply safety of the load. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural framework diagram of a zero-overcurrent uninterruptible power supply system provided in an embodiment of the present application;

[0033] Figure 2 is a schematic diagram of a local display provided by an embodiment of the present application;

[0034] Figure 3It is a parameter display effect diagram of the on-site display provided in the embodiment of the present application;

[0035] Figure 4 is a rear view of a zero-overcurrent uninterruptible power supply system provided by an embodiment of the present application;

[0036] Figure 5 It is a schematic diagram of the dimensions of the back side of the zero-overcurrent uninterruptible power supply system provided in an embodiment of the present application;

[0037] Figure 6 It is a front view of a zero-overcurrent uninterruptible power supply system provided by an embodiment of the present application;

[0038] Figure 7 It is a schematic diagram of the dimensions of the front side of the zero-overcurrent uninterruptible power supply system provided in an embodiment of the present application;

[0039] Figure 8 is a cross-sectional view of the internal structure of a zero-overcurrent uninterruptible power supply system provided by an embodiment of the present application;

[0040] Fig. 9 It is a wiring diagram of a zero-overcurrent uninterruptible power supply system provided in an embodiment of the present application;

[0041] Fig.10 It is a physical connection diagram of a zero-overcurrent uninterruptible power supply system provided by an embodiment of the present application;

[0042] Fig.11 It is a flowchart of the operation of the zero-overcurrent uninterruptible power supply system provided by the embodiment of the present application;

[0043] Fig.12 It is a schematic diagram of the hardware structure of the electronic device provided in the embodiment of the present application. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. When the following description refers to the 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 embodiments of the present application. They are only examples of devices and methods consistent with some aspects of the embodiments of the present application as detailed in the attached claims.

[0045] It is understood that the terms "first", "second", etc. used in this application can be used to describe various concepts in this article, but unless otherwise specified, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another concept. For example, without departing from the scope of the embodiment of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the words "if" and "if" as used herein can be interpreted as "at the time of" or "when" or "in response to determination".

[0046] The terms "at least one", "multiple", "each", "any", etc. used in this application, at least one includes one, two or more, multiple includes two or more, each refers to each of the corresponding multiple, and any refers to any one of the multiple.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0048] First, the terms involved in the embodiments of the present application and some related technologies are explained as follows.

[0049] (1) Action time: The action time refers to the time required for the switch to receive the switching action command and the switch output terminal to change.

[0050] (2) Green electricity: Green electricity refers to electricity that does not emit pollutants or has zero (close to zero) carbon dioxide emissions during the production process. Compared with thermal power generation, it has a lower impact on the environment. The main sources of green electricity include renewable energy such as solar energy, ocean energy, wind energy, biomass energy, and geothermal energy.

[0051] (3) Internet Data Center (IDC) Standards: IDC standards refer to a series of specifications and requirements that Internet Data Centers should follow in terms of operation, management, and services. These standards are designed to ensure that IDCs can provide high-quality, secure, and reliable data storage, processing, and transmission services to meet the business needs of enterprises and organizations.

[0052] With the continuous development of big data, cloud computing, and the Internet of Things, people's demand for the construction of data center rooms is increasing, and higher requirements are also placed on their power supply systems. Energy storage UPS connects the battery to the host, and converts DC power into AC power through module circuits such as the host inverter, which is used to provide a stable and uninterrupted power supply to a single computer, computer network system or other power electronic equipment to ensure the uninterrupted operation of these equipment and instruments, but energy storage UPS still has the following problems.

[0053] (1) At present, the life of energy storage UPS batteries generally needs to be replaced every three years to ensure safe power supply of UPS. This is undoubtedly a consumable long-term expense, and it also means that UPS is a huge carbon emission and environmentally unfriendly equipment. In addition, the performance and life of batteries are greatly affected by the environment and have high requirements for the working environment. For example, batteries generate heat during the charging and discharging process. If the ambient temperature is too high, it will affect the heat dissipation of the battery and increase the risk of battery failure. Therefore, air conditioning is required to maintain the temperature. At the same time, due to the unreliability of electrochemical reactions, personnel are required to use a multimeter to regularly measure the quality of the battery, resulting in a large amount of maintenance costs to ensure the normal operation of the UPS.

[0054] (2) Limited by the capacity of the battery, energy storage UPS can usually only maintain power supply for a short time, and it is difficult to achieve high-power and long-term power guarantee. In order to overcome the limitations of batteries, the industry has tried to explore other power guarantee solutions, among which the dual-circuit switching device is a technology worthy of attention. The dual-circuit switching device can quickly switch to the backup power supply when the main power supply fails by connecting two different power sources, thereby ensuring the continuous power supply of the load equipment. However, the switching time of mainstream products exceeds 1s, and the switching process will cause all digital products to be powered off, restarted, and impacted. According to the IDC standard of the International Data Center, the switching time of a UPS should be less than 20ms. Therefore, the dual-circuit switching device cannot meet the IDC standard and cannot be used as a UPS. Even if there are individual devices that can achieve fast switching, because power electronic products such as thyristors, CMOS, silicon carbide, IGBT, etc. are used between the circuits, there is no isolation between the dual circuits. During high-speed switching, the current on the power supply side and the load side changes greatly, which will produce strong electromagnetic transient processes, form impact currents, and generate electromagnetic impacts on loads, power supplies, and equipment. The safety of the power distribution system cannot be guaranteed, which becomes a safety hazard. For example, electromagnetic interference and overvoltage shocks may cause the dual circuits to be converted from tiny currents between thyristors into dual power supplies that are turned on simultaneously, causing serious power distribution accidents and reducing the safety of power supply. These problems limit the application of dual-circuit switching devices in UPS.

[0055] In view of this, the embodiments of the present application provide a zero-overcurrent uninterruptible power supply system and its control method, device and medium, which belong to the field of power supply technology. The power UPS is an innovative power distribution guarantee device that meets the UPS standard of IDC and does not require batteries. It can use the dual-circuit power supply to achieve uninterruptible power supply on the load side, achieve zero overcurrent and high-performance non-sensing switching between power supply circuits, and achieve uninterruptible power supply on the power consumption side with ultra-large capacity, which is of great significance to the improvement of power guarantee in all walks of life.

[0056] refer to Figure 1 , Figure 1It is a structural schematic diagram of a zero-transition power type uninterruptible power supply system provided in an embodiment of the present application, which includes multiple input circuits, an output bus, a central control unit and a static power conversion device.

[0057] The multi-input circuit includes a main power supply circuit and a standby power supply circuit, and the multi-input circuit is used to obtain AC power from the power supply side.

[0058] The static power conversion device includes a first switch group and a second switch group, wherein the first switch group and the second switch group include a plurality of switches; the static power conversion device is any one of a mechanical contactor or a relay, and is used to ensure safe electrical isolation of the power switching process.

[0059] The main power supply circuit and the backup power supply circuit are connected in parallel to the output bus, wherein the main power supply circuit is connected to the output bus through the first switch group, and the backup power supply circuit is connected to the output bus through the second switch group. The output bus is used to supply power to the load side.

[0060] A microprocessor is embedded in the central control unit, and the microprocessor is used to detect the action time of each switch of the static power conversion device and calculate the AC zero-crossing time required for predictive control of each switch.

[0061] The central control unit is connected to the first switch group and the second switch group respectively. The central control unit is used to control the first switch group to be disconnected at the AC zero-crossing point according to the action time when the main power supply circuit fails, and control the second switch group to be closed at the AC zero-crossing point.

[0062] Specifically, the zero-overcurrent uninterruptible power supply system (hereinafter referred to as power type UPS) includes multiple input circuits, output busbars, a central control unit and a static power conversion device. The multiple input circuits include a main power supply circuit and a backup power supply circuit.

[0063] Optionally, the multiple input circuits may include one main power supply circuit and one backup power supply circuit, or include one main power supply circuit and multiple backup power supply circuits. Each circuit in the multiple input circuits is respectively connected to an electric power source on the power supply side for subsequent power supply.

[0064] It should be noted that the number of backup power supply circuits can be set to one or more according to actual needs, as long as uninterrupted power supply can be guaranteed, and the embodiments of the present application do not impose specific restrictions.

[0065] The static power conversion device includes a first switch group and a second switch group, wherein the first switch group and the second switch group include a plurality of switches.

[0066] The multi-input circuit is used to obtain AC power (single-phase or three-phase power) provided by multiple power sources from the power supply side. The output side of the multi-input circuit is connected in parallel to the output bus (single-phase or three-phase power with corresponding phase sequence) of the power load, wherein the main power supply circuit is connected to the output bus through the first switch group, and the backup power supply circuit is connected to the output bus through the second switch group, forming the output bus of the power type UPS or static power conversion device. The output bus is connected to the load (single-phase or three-phase power with corresponding phase sequence) of the multi-circuit output interface through a dedicated power interface branch to supply power to the load side. The power provided by the multi-input circuit can realize the power supply guarantee without battery energy storage, so as to achieve the purpose of uninterrupted power supply.

[0067] In order to overcome the problem of no isolation between circuits, the switch in the static power conversion device, as a component for connecting or disconnecting the power, can select a mechanical contactor or relay to achieve 100% isolation on and off, ensuring the necessary safe electrical isolation during the power switching process. Different from relying on power electronic products such as thyristors, CMOS, silicon carbide, IGBT, etc., due to the weak overvoltage ability and insufficient insulation resistance of power electronic products, the high resistance state is respectively input between channels, and power electronic products are prone to instability and even electrical short circuit. The static power conversion device is 100% electrically isolated, and there will be no loop current in the internal high resistance state of the power electronic components, so it is safe and reliable switching.

[0068] It should be noted that when selecting a static power conversion device, it is necessary to ensure that the action time of the contactor or relay from open to closed or from closed to fully open is stable. The action time of a customized contactor or relay is generally within 10-20ms.

[0069] By selecting static power conversion devices with different power current carrying capacity, it is possible to achieve 50Hz or 60Hz power multi-power supply circuit switching of various voltage levels in the range of 10Aac-2000Aac through a zero transition solution. For example, for load currents less than 150A, the customized contactor or relay action time must be less than 10ms; for 150A-1200A, the contactor or relay action time is required to be less than 30ms.

[0070] Optionally, in order to ensure that the static power conversion device has excellent action repeatability, for example, a variation of less than 300 microseconds, a high-performance magnetic latching relay or contactor may be selected as the static power conversion device.

[0071] Arc is a high-power discharge phenomenon. When the switch is used to disconnect the current, if the circuit voltage is not less than 10-20V and the current is not less than 80-100mA, an arc will be generated between the contacts of the switch. The arc burning time only needs to be 10-20 milliseconds longer than normal, and the contacts will be severely burned. Therefore, the arc has a great impact on the safe operation of the power supply and distribution system.

[0072] In order to fundamentally solve the impact of arc on power load, grid harmonic interference and the impact on life, a microprocessor is embedded in the central control unit, which is used to detect the action time of each switch of the static power conversion device and calculate the AC zero-crossing time required for predictive control of each switch. By embedding a microprocessor to accurately and dynamically detect the action time of each switch in the static power conversion device, and accurately calculate the closing or disconnection measurement and control of each switch at the AC zero-crossing point, the electrical rapid switching between multiple circuits is completed. The central control unit forms an active control connection with the first switch group and the second switch group respectively, which is used to control the first switch group to disconnect at the AC zero-crossing time according to the action time when the main power supply circuit fails, and control the second switch group to close at the AC zero-crossing time. By switching from an abnormal or faulty input power circuit to an electrical input circuit with normal and reliable power, a stable, reliable and uninterrupted load power supply is achieved.

[0073] Specifically, before the microprocessor issues a control closing instruction to the static power conversion device, it first applies a high-frequency carrier as a detection signal source to the input side of each switch in the static power conversion device, and detects the applied high-frequency carrier at the output side of each switch in the static power conversion device. The time difference between issuing the control closing instruction and detecting the applied high-frequency carrier is used as the closing action time of the switch.

[0074] Alternatively, before the microprocessor issues a control disconnection instruction to the static power conversion device, it first applies a high-frequency carrier as a detection signal source to the input side of each switch in the static power conversion device, and detects the applied high-frequency carrier on the output side of each switch in the static power conversion device, and uses the time difference between issuing the control disconnection instruction and failing to detect the applied high-frequency carrier as the disconnection action time of the switch.

[0075] At the same time, the microprocessor detects the voltage and current of the AC power input through the main power supply circuit and the backup power supply circuit, and determines the zero-crossing point of the voltage or current waveform of the AC power as the AC zero-crossing point moment.

[0076] When an abnormal fault occurs in the main power supply circuit, the central control unit can calculate the time to send instructions in advance based on the action time corresponding to each switch, so that the first switch group can be disconnected just at the AC zero-crossing moment, and the second switch group can be connected just at the AC zero-crossing moment. During the switching process, due to precise control at the AC zero-crossing point and the flexible characteristics of the AC zero-crossing point, when the switching is selected at the AC zero-crossing point, the voltage and current of the circuit are zero, so the computer is not impacted, the switch itself is not impacted, the power supply on the power supply side is not impacted, and the switch will not produce arc burning, which can achieve the mechanical life of the device.

[0077] It can be understood that when the power of the main power supply circuit is restored, or when an abnormal fault occurs in the backup power supply circuit, the central control unit controls the second switch group to disconnect at the AC zero point according to the action time, and controls the first switch group to close at the AC zero point, actively switching back to the main power supply circuit.

[0078] By using the AC zero-crossing on / off function, the switching life of the power UPS can be extended by hundreds of times, avoiding the arc burning and impact of the load electrical appliances and the UPS itself caused by conventional disconnection. Therefore, the AC zero-crossing switching can achieve 500kw and stable and repeated switching, and the service life of the switch can be extended to hundreds of thousands of times, effectively improving durability and power supply safety.

[0079] In some embodiments, the power supply side includes grid power, green power, power output by an inverter, or power output by a local generator.

[0080] It is understandable that the electric UPS overcomes the application of the circuit switching device in the UPS, and has the function of directly isolating the operation between the microgrid and the large grid to form green electricity, and serving as a backup power supply for each other. It can serve the non-grid-connected operation of massive green electricity, so that the development of green electricity is no longer constrained by the stable power supply load of the power grid, and provides the most powerful support for the decarbonization of the power supply side. Therefore, the power supply side of the multi-input circuit can be the input power provided by the circuits from different substations of the large power grid, wherein the input power includes but is not limited to the grid power supplied by multiple substations, green power (renewable energy such as ocean energy, wind energy, solar energy, geothermal energy, etc.), power output by the energy storage inverter, or power from a local generator. During the circuit switching process, the electric UPS can switch the grid and solar energy, wind energy, and wave energy at a high-speed and non-inductive UPS level, with a speed of up to 22Hz, and keep the power consumption continuous and stable.

[0081] In some embodiments, in addition to the main power supply circuit and the backup power supply circuit, the multi-input circuit can also add a third circuit connected to the local generator. When one circuit is out of power or under maintenance, the local generator can be enabled as a hot standby.

[0082] In some embodiments, a power circuit breaker is provided at the input end of each circuit in the multi-input circuit, and the power circuit breaker is used for short-circuit protection on the power supply side.

[0083] Each of the multiple input circuits is embedded with a voltage transformer, which dynamically detects the voltage status and uses the voltage status as feedback information for relay protection and power supply side health status diagnosis.

[0084] Each line on the load side is equipped with a current transformer, which dynamically detects the current state and uses the current state as feedback information for relay protection.

[0085] Specifically, in order to ensure electrical safety, each power input end in a multi-input circuit must be connected to a power circuit breaker to achieve short-circuit protection for the power supply side grid, that is, safe isolation during debugging and maintenance.

[0086] An independent voltage transformer is embedded in each of the multiple input circuits to sense, detect and monitor the voltage status of each phase of each input circuit, and serves as feedback information for the health status diagnosis of the multiple input power supply side. At the same time, it is also important feedback information for the power UPS to implement relay protection, including but not limited to: phase loss protection, overvoltage protection, undervoltage protection, and abnormal recording at the switching time.

[0087] Each independent power supply circuit on the output side of the power load is embedded with a current transformer to measure the current state of the power UPS or static power switching device, record abnormalities at the switching moment, and provide feedback information on electrical protection parameters for the relay protection that is necessary to protect the output load.

[0088] The health status of the power load is fed back to the microprocessor through the voltage transformer and the current transformer at the same time, and the power transient process during the switching of multiple power supply circuits is recorded in real time. This helps the subsequent microprocessor to analyze the health and operating status of the system during the switching process to ensure reliable, safe and stable operation.

[0089] In some embodiments, the zero-overcurrent uninterruptible power supply system further includes a local display connected to the microprocessor.

[0090] The microprocessor is also used to dynamically detect the power operating parameters of each of the multiple input circuits and make online analysis and control decisions based on the power operating parameters, wherein the power operating parameters include voltage, current, power, power factor and temperature.

[0091] The local display is used to display the numerical values ​​and process curves of power operation parameters, and at the same time display the online operation status of the zero-overcurrent type uninterruptible power supply system.

[0092] The local display is also used to display the values ​​of preset parameters, wherein the preset parameters include relay protection parameters, switching condition parameters and extreme state parameters.

[0093] Specifically, the electric UPS also includes a local display, and the local display is connected to the microprocessor.

[0094] The microprocessor is also used to dynamically detect the power operation parameters of each of the multiple input circuits, and to make online analysis and control decisions based on the power operation parameters, wherein the power operation parameters include voltage, current, power, power factor, and the temperature of the system internal and output busbars. After the microprocessor detects the power operation parameters, it is displayed on a local display connected to the microprocessor.

[0095] For example, reference Figure 2 , a liquid crystal screen can be installed on the shell surface of the electric UPS as a local display to display the voltage, current values ​​and process curves of each input circuit and the voltage, current values ​​and process curves of the load side in real time, and at the same time display the online operation status of the electric UPS, such as whether the electric UPS has been normally connected to the power supply and is in working condition, or the power supply circuit of the electric UPS is running, etc., which helps users to have a more comprehensive understanding of the current operation status of the electric UPS, such as Figure 3 As shown, the LCD screen can display information such as voltage, current, power, power factor and power consumption of different incoming lines as well as the lines currently powered by the power-type UPS.

[0096] Optionally, the local display is also used to display the values ​​of preset parameters, wherein the preset parameters include relay protection parameters, switching condition parameters and extreme state parameters. By displaying the values ​​of various preset parameters such as power relay protection, switching conditions, extreme state protection, etc. on the local display, the user can configure different power operation modes, power relay protection parameters, multi-input switching condition parameters and extreme state parameters (such as the ambient temperature inside the equipment, the operating temperature of the internal PCB core components, the health status of the equipment) for the electric UPS according to different application scenarios, and make timely predictions, warnings and forecasts of abnormalities. Reference Figure 3 There are parameter setting function keys on the LCD screen. By clicking the parameter setting function keys, the corresponding function interface can be displayed so that users can configure different parameters.

[0097] In other embodiments, a device operation status indicator light may be installed at the front end of the electric UPS, and the device operation status indicator light is used to display the online operation status of the electric UPS. Alternatively, a device operation status indicator light and a local display may be installed at the front end of the electric UPS at the same time.

[0098] In some embodiments, the zero-overcurrent uninterruptible power supply system further includes a network communication unit and a cloud management platform. The network communication unit is connected to the central control unit, and the cloud management platform exchanges information with the network communication unit.

[0099] The remote control terminal is used to actively send circuit switching instructions.

[0100] The network communication unit is used for receiving the circuit switching instruction and sending the circuit switching instruction to the central control unit.

[0101] The central control unit responds to the loop switching instruction, controls the first switch group to disconnect at the AC zero-crossing moment according to the action time, and controls the second switch group to close at the AC zero-crossing moment, or controls the second switch group to disconnect at the AC zero-crossing moment according to the action time, and controls the first switch group to close at the AC zero-crossing moment.

[0102] Specifically, the electric UPS also includes a network communication unit and a cloud management platform, wherein the network communication unit is connected to the central control unit, and the cloud management platform exchanges information with the network communication unit.

[0103] It can be understood that the cloud management platform is used to actively send circuit switching instructions for switching between multiple power supply circuits when there is a specific need, remotely control the power UPS switching circuits, and achieve uninterrupted power supply to the power load.

[0104] Optionally, in terms of communication, a 485 communication module or a WIFI wireless module is embedded in the electric UPS as a network communication unit, which is used to receive loop switching instructions and send the loop switching instructions to the central control unit, so as to realize information interaction and remotely control the networking of massive intelligent switches.

[0105] After the central control unit receives the circuit switching instruction transmitted by the network communication unit, in response to the circuit switching instruction, if the current power type UPS is powered by the main power supply circuit, the first switch group is controlled to be disconnected at the AC zero-crossing moment according to the action time, and the second switch group is controlled to be closed at the AC zero-crossing moment, and the power type UPS is remotely controlled to switch from the main power supply circuit to the backup power supply circuit. If the current power type UPS is powered by the backup power supply circuit, the second switch group is controlled to be disconnected at the AC zero-crossing moment according to the action time, and the first switch group is controlled to be closed at the AC zero-crossing moment, and the power type UPS is remotely controlled to switch from the backup power supply circuit to the main power supply circuit.

[0106] Furthermore, the program in the central control unit can be programmed according to the requirements to complete the specified work. Alternatively, the sequential on-off control and program management control of a large number of loads can be realized through the network communication unit.

[0107] It should be noted that in order to ensure safety, overvoltage, undervoltage and overcurrent protection programs are also written into the central control unit.

[0108] In some embodiments, when the AC power is three-phase power, the central control unit is also used to predict the AC zero-crossing moment of each phase in phase, and switch between multiple input circuits in phase at the AC zero-crossing moment.

[0109] Specifically, when the AC power is three-phase, the central control unit is also used to achieve fast switching between multiple input circuits to meet the UPS requirements. First, the AC zero-crossing time of each phase is predicted by phase separation, and at the AC zero-crossing time, the contactor or relay of a certain circuit is cut off by phase separation, and then the contactor or relay group of another circuit is switched on by phase separation, ensuring that the switching time of a single phase is controlled within 20ms and the switching time of a three-phase is controlled within 60ms.

[0110] In some embodiments, when there are multiple power transformers supplying power on the power supply side, the central control unit is also used to dynamically control the zero-overload uninterruptible power supply system to switch to the side with the largest load on the power transformer when the load on the power transformer is unbalanced based on the load rates of the multiple power transformers, so that the load can be continuously transferred between the multiple power transformers to maintain load balance.

[0111] Specifically, the zero-overcurrent UPS can not only complete the power uninterruptible power supply capabilities, but also realize the intelligent balancing of power loads between multiple transformers. When multiple power transformers are connected to the load side, the central control unit can simultaneously serve as a load balancing device for multiple transformers. When a transformer has a larger load than other transformers in the area, the software embedded in the microprocessor is used to actively and dynamically control the power UPS to switch to the side with a higher load on the power transformer. This convenient and uninterrupted load transfer can achieve load balancing of multiple circuit transformers and improve the availability of power supply, so that the load can be transferred uninterruptedly between multiple transformers, maintain load balance, reduce transformer losses, and improve the safety and quality of power supply.

[0112] Optionally, by presetting a balance threshold, when the load rate between transformers exceeds the preset balance threshold, it is confirmed that the current transformer load is unbalanced.

[0113] Exemplarily, the preset balancing threshold is 10%. When the power load of one transformer in the dual transformers connected to the power UPS is greater than that of the other transformer, for example 15%, the adaptive software in the central control unit will compare the load rate of the transformer connected to the load side. When it is determined that the load of the power transformer is unbalanced, the power UPS will be automatically controlled to actively and seamlessly switch the power load to the transformer with smaller load. This will not only achieve transformer load balancing, but also effectively improve the operating flexibility of the local power distribution system, reduce transformer losses, and allow the transformer capacity to operate conveniently and effectively. It is also an effective mechanism to ensure the safety of power supply and distribution.

[0114] It is understandable that the electric UPS will intelligently transfer the power load between multiple transformers according to the load rate of multiple power transformers, ensure the balance of power supply and demand, effectively reduce the operation risk of the power system, and reduce the loss of power transformers. In a wider range, the electric UPS can also realize the transfer of load between the three phases of power, realize the symmetry of dynamic three-phase power, improve the power supply and power quality on the power distribution side, greatly reduce the loss caused by three-phase asymmetry, and eliminate various safety hazards caused by three-phase power asymmetry.

[0115] It should be noted that, through the topology of the power distribution network, the power load borne by the power-type UPS controller can also be switched to different power transformers in layers to achieve dynamic AI balancing of multiple transformers.

[0116] In this embodiment, the electric UPS can not only achieve uninterrupted power supply, but also realize power load balancing among multiple transformers, solve the problem of asymmetric three-phase power, and ensure high reliability and high quality of power distribution and power consumption.

[0117] The following is a detailed introduction and description of the solution of the embodiment of the present invention in conjunction with a specific application example.

[0118] Uninterruptible power supply is an indispensable power supply equipment for all walks of life in the whole society. In 2023, the global UPS market size reached 61.107 billion yuan. Relevant reports predict that the global UPS market size will reach 95.699 billion yuan by 2029, with an average annual compound growth rate of 7.55% from 2023 to 2029. The future development direction of UPS is high power, large-scale, and park-based, which is consistent with the characteristics of the zero-overcurrent uninterruptible power supply system provided by this application, greatly promoting the further development of the UPS market.

[0119] Reference Figure 4 On the back of the electric UPS, there are power I interface, power II interface, antenna transfer port, screen and button external port, 8 IEC13 sockets and 1 IEC19 socket.

[0120] The sizes of the interfaces on the back are as follows: Figure 5 As shown, for example, the length and width of the power supply I interface are both 36mm, and the distance from the left edge and the bottom edge of the shell is 12mm. The length and width of the power supply II interface are both 36mm, and the distance from the right edge and the bottom edge of the shell is 12mm. The diameter of the screen and button external port is 22mm.

[0121] The main power supply circuit is connected to the first power supply through the power supply I interface, the backup power supply circuit is connected to the second power supply through the power supply II interface, and the network communication unit is connected to the antenna adapter port.

[0122] Reference Figure 6 The front of the electric UPS is equipped with RS485 interface, RJ45 interface, BURNER interface, USB interface, automatic interface, manual control interface, incoming line I interface, incoming line II interface, reset interface and touch screen.

[0123] The sizes of the interfaces on the front are as follows: Figure 7 As shown in the figure, the diameters of the RS485 interface, RJ45 interface, BURNER interface, and USB interface are all 25.5mm, and the center distance between the interfaces is 32mm. The diameters of the automatic interface, manual control interface, incoming line I interface, incoming line II interface, and reset interface are all 18.2mm, and the center distance between the interfaces is 30mm. The touch screen is 118mm long and 41mm wide.

[0124] The output bus is connected to the three-phase or single-phase power load of the incoming line I interface and the incoming line II interface through a dedicated power interface branch.

[0125] Reference Figure 8 There are 4 120A relays and a control board inside the electric UPS. The relay serves as a static power conversion device, and the control board serves as a central control unit. When a circuit fails, it can accurately predict the action time of the relay and accurately control the relay to complete the zero-crossing switching process as quickly as possible.

[0126] This electric UPS adopts AC zero-crossing precise high-speed measurement and control technology to realize precise control of the phase-splitting or single-phase coordination of the static power switching device. The single-phase meets the international IDC standard. All computers will not restart within 60ms of the three-phase, and all digital devices will not feel anything.

[0127] Specifically, the independent power supply circuits of multiple input circuits are converged by unidirectional diodes. Under normal circumstances, any input power supply has power, which fully guarantees the internal power supply of this power-type uninterruptible power supply. Each input power circuit is a group of live wire (which can be single-phase or three-phase power) and neutral wire. Each power circuit (three circuits if it is three-phase power) is controlled by its own relay to control the on and off of each circuit in the group. When switching between two or more circuits, the group accurately predicts the time when the power AC passes through zero point of each phase, and controls the corresponding relays to disconnect each relay according to the phase sequence at the time when the AC passes through zero point.

[0128] For example, the electric UPS fully utilizes the characteristics of AC power as a sine wave through the central control unit. When encountering a sudden fault, the electric UPS can automatically switch the load from one power supply of the circuit to another backup power supply. The embedded microprocessor edge computing function accurately and quickly controls the static power switching device to cut off the circuit at the AC zero-crossing moment. After one circuit is cut off, within the standard 20ms of the international data center uninterruptible power supply power outage interval, the backup power supply is quickly put into use to ensure that the electrical load side can safely and reliably obtain uninterruptible power supply. Effectively ensure the safety and continuity of the production and distribution system, and reduce the dependence on the reliability of the single-circuit power supply of the power system.

[0129] If the AC power is three-phase electricity, the static power switching device is precisely controlled in phase coordination. Under the background of zero transition, high performance is used to achieve senseless switching between two or more power supply circuits, so that all three phases can be switched within 60ms, meeting the power-off time interval within the standard to ensure continuous and reliable operation of important loads. The switching time is fast, and the dual-circuit senseless switching can be completed in 30-60ms. The reliability is strong and the successful switching rate reaches 99.9999%.

[0130] Take three-phase dual power input as an example, refer to Fig. 9 The three live wires (A, B, C) and one neutral wire (N) of the power supply I are respectively connected to the first input terminal of the power type UPS through the interface, wherein each line is controlled to be on and off by a switch in the first switch group.

[0131] The three live wires (A, B, C) and one neutral wire (N) of the power supply II are respectively connected to the second input terminal of the power type UPS through interfaces, wherein each wire is controlled to be on and off by a switch in the second switch group.

[0132] The output end of the power type UPS is connected to the load of the multi-circuit output interface through the power bus and the dedicated power interface branch.

[0133] Reference Fig.10, connect the input power supply to the power UPS and the load according to the above connection method. If the power supply I fails, the power UPS cuts off the switches in the first switch group at the AC zero crossing time according to the action time of each switch, and then switches on the switches in the second switch group to complete the inductive switching of the circuit.

[0134] The electric UPS can achieve fast switching in both single-phase and three-phase scenarios, allowing the load to achieve senseless switching and achieve the goal of UPS. In the context of zero transition, high performance realizes senseless switching between two or more power supply circuits, with high reliability, high stability, and ultra-large capacity to achieve uninterrupted power supply on the power consumption side.

[0135] The zero-overcurrent uninterruptible power supply system provided in the embodiment of the present application is a new technology and product as the most important guarantee equipment of the power distribution system. It does not require battery energy storage and is suitable for places that originally required battery UPS. It can replace electronic and battery uninterruptible power supplies in 90% of application scenarios. The power UPS is an innovative product that ensures energy supply security, security, and improves energy efficiency, and has epoch-making significance in the UPS industry.

[0136] At the same time, the electric UPS can also adapt to extreme natural environments and extreme electromagnetic environments, with unlimited power, once-and-for-all power guarantee, no need to replace batteries, no carbon emissions, and the special stability and reliability of power equipment. It can be used in places that require power supply guarantee and continuity, such as data centers IDC, key power distribution links in national defense, railways, highways, municipal engineering, social security facilities, high-quality CNC industrial manufacturing bases, large urban infrastructure and all places that require primary and secondary power distribution guarantees. Compared with energy storage UPS, electric UPS has a wider range of versatility and can meet the needs of more markets.

[0137] It is understandable that, unlike the time limit of the battery in the energy storage UPS, the power type UPS uses multiple power circuits in the power grid, which usually have high reliability and stability. The probability of two power circuits being out of power at the same time is two orders of magnitude lower than the probability of the battery breaking down. The power type UPS can switch from transformer A to transformer B without time limit, so the power of transformer B can be used for a long time, which makes the power type UPS have the characteristics of long-term uninterrupted power supply, high reliability and stability, and can meet the high requirements of the site for power security.

[0138] In addition, the power UPS is not limited by capacity, and the maximum capacity can reach 600kVA. It is a high-quality solution that uses power loops to supply power without batteries, thus reducing huge costs and the huge expenses required for regular batteries. Users are no longer limited by capacity and can build a new generation of high-performance power distribution networks.

[0139] Therefore, electric UPS can replace traditional energy storage UPS in 90% or even more occasions. Electric UPS can also achieve energy conservation and emission reduction by using loop power supply instead of batteries, which can reduce carbon emissions by about one billion tons each year. Moreover, batteries themselves waste a lot of electricity. Its charging efficiency is 80%, of which 20% is wasted, and its discharge efficiency is only 80%, so the energy consumption and pollution caused are very large. In addition, electrochemical reactions are unreliable, and the quality of batteries needs to be measured regularly with a multimeter. Electric UPS eliminates high emissions, high pollution and high labor intensity from the bottom logic, which is of environmental significance.

[0140] Compared with the short life of energy storage UPS, which requires regular replacement of batteries, has high emissions, high costs, and low reliability, the electric UPS gets rid of batteries that are very unfriendly to the environment, thus achieving green development, green innovation, and green practice, which is of great significance for reducing the demand for batteries that emit hundreds of millions of tons of carbon each year, and contributes to sustainable development. In addition, the electric UPS also provides a new and better choice for the country's non-grid-connected green electricity consumption and 100% local consumption. Relevant industries can upgrade and replace pollution and energy storage UPS that require continuous replacement of batteries in 90% of scenarios, which is more environmentally friendly.

[0141] Furthermore, energy storage UPS is a power electronic product, not an electric product. Electric products must be able to withstand extreme natural environments, such as high temperature, high humidity, high pollution, and high dust. Therefore, energy storage UPS has high environmental requirements and requires air conditioning to maintain temperature, keep clean, and have requirements for dust. Electric products must be able to withstand extreme electromagnetic environments, such as overvoltage, lightning, and electric shock. Electric UPS can pass the 3C mandatory certification, meet the indicators and standards of electric products, and can be installed on railways, outdoors, and in extremely harsh environments, which will free up huge space for users that originally needed to store batteries and a safe exhaust system.

[0142] Therefore, compared with traditional energy storage UPS, power UPS has strong environmental adaptability and can provide users with more reliable, safer and more convenient power protection. It does not need to regularly replace batteries and specially equip corresponding environmental and human resources like energy storage UPS, which causes endless investment. It can reduce environmental and resource costs for users.

[0143] Furthermore, in the era of artificial intelligence development, electric UPS also combines AI technology and embeds digital functions. The central control unit integrates measurement, control, protection, programming, and communication in an integrated intelligent module, realizing powerful edge computing, real-time measurement, online protection, and IoT communication. It can dynamically manage loads online throughout the life cycle, monitor load and channel status online, and achieve a measurement accuracy of 0.5%. By embedding measurement, control, protection, communication, and edge computing in one, AI autonomous control and remote control and digital twins that respond to the cloud platform are achieved. At the same time, it has built-in protection functions such as overvoltage, undervoltage, overcurrent, phase loss, and overheating. It is a breakthrough AI product in the field of high-reliability power supply and distribution.

[0144] Power UPS can switch on and off according to intelligent selection, remote control or manual operation buttons, and can ensure the power load balance and three-phase symmetry of multi-transformer scenarios, reduce transformer loss and line loss, improve load efficiency, and realize remote management, program control management, power peak shifting and other functions on the power demand side. Reduce various safety hazards caused by discontinuous power supply, promote the development of AI in high-quality power security, build a new power system and smart grid, and create a more environmentally friendly and sustainable energy security system.

[0145] In this embodiment, the electric UPS does not require the battery of the traditional UPS, and its service life is much longer than that of the traditional energy storage UPS. It can reduce environmental pollution, space waste, and operation and maintenance labor and costs caused by battery detection and replacement. It provides three ways: local manual, remote control, and AI intelligence to ensure uninterrupted power supply to the power load. Edge computing is realized through an embedded high-performance microprocessor to achieve arc-free AI multi-power supply without sense switching, which is advanced. At the same time, since the high-speed isolation of dual power circuits and the problem of inductive switching between multiple circuits have been solved, zero transition and no impact can be achieved, and the impact of arcs on loads, power grids and static power conversion devices when switching multiple circuits is eliminated, harmonic interference is eliminated, and the safety and reliability of the system are further improved. At the same time, the electric UPS also solves the major issue of load balancing between multiple transformers, effectively reducing the operating risks and transformer losses of the power system, and achieving symmetry of three-phase power.

[0146] An embodiment of the present application also provides a control method for a zero-overcurrent uninterruptible power supply system, which is applied to a zero-overcurrent uninterruptible power supply system. The control method includes but is not limited to steps S101 to S103.

[0147] Step S101: obtaining AC power from the power supply side through a multi-input circuit.

[0148] Step S102: Detect the action time of each switch of the static power conversion device and calculate the AC zero-crossing time required for predictive control of each switch through a microprocessor.

[0149] Step S103: When the main power supply circuit fails, the central control unit controls the first switch group to be disconnected at the AC zero-crossing point according to the action time, and controls the second switch group to be closed at the AC zero-crossing point.

[0150] Reference Fig.11 , Fig.11 It is a flowchart of the operation of the zero-overcurrent uninterruptible power supply system provided in the embodiment of the present application.

[0151] Specifically, AC power is obtained from the power supply side through the multi-input circuit. The power supply side inputs A power and B power to the multi-input circuit respectively. It should be noted that the input power source can be a three-phase multi-power input power source or a single-phase multi-power input power source.

[0152] Customized high-performance contactors are used as elements for connecting or disconnecting power. Each input circuit is controlled by its own contactor. A electrical circuit is connected or disconnected through A circuit contactor, and B electrical circuit is connected or disconnected through B circuit contactor. The action time of these elements is within 10-20ms, ensuring non-inductive switching at the moment of AC zero crossing.

[0153] The central control unit integrates a high-performance microprocessor unit, a power Internet of Things terminal, an IoT edge computing unit, and a network communication unit. The central control unit uses voltage transformers and current transformers to sense and monitor the voltage of each input circuit and the output current state in real time. At the same time, it uses temperature sensors to monitor the temperature of the UPS to ensure that the system will not overheat when running under high load.

[0154] The microprocessor detects the action time of each switch of the static power conversion device and calculates the AC zero-crossing time required for predictive control of each switch. When the main power supply circuit fails, the central control unit controls the first switch group to open at the AC zero-crossing time according to the action time, and controls the second switch group to close at the AC zero-crossing time.

[0155] For example, when switching, by embedding a microprocessor unit, the electric UPS can accurately and dynamically detect the action time of the contactor, and predict the zero-crossing moment of each phase of the AC power through precise calculations of the microprocessor. When there is an electrical abnormality or failure in A, the A circuit contactor is controlled to disconnect at the AC zero-crossing moment, and the B circuit contactor is controlled to close, thereby achieving impact-free switching of the load.

[0156] Furthermore, through the embedded network communication unit and power Internet of Things terminal, the electric UPS can realize information interaction and remote control with the cloud platform.

[0157] Electric UPS can also perform edge computing based on data such as electrical parameters and output current through the IoT edge computing unit, providing functions such as load health diagnosis and abnormal prediction, early warning and forecasting.

[0158] The embodiment of the present application also provides an electronic device, the electronic device includes a memory and a processor, the memory stores a computer program, and the processor implements the control method of the zero-overcurrent uninterruptible power supply system when executing the computer program. The electronic device can be any intelligent terminal including a tablet computer, a car computer, etc.

[0159] It can be understood that the contents of the above method embodiments are all applicable to the present device embodiments, the functions specifically implemented by the present device embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0160] See also Fig.12 , Fig.12 The hardware structure of an electronic device of another embodiment is illustrated, and the electronic device includes:

[0161] The processor 901 can be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of the present application.

[0162] The memory 902 can be implemented in the form of a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory 902 can store an operating system and other application programs. When the technical solution provided in the embodiment of this specification is implemented by software or firmware, the relevant program code is stored in the memory 902, and the processor 901 calls and executes the control method of the zero-overcurrent uninterruptible power supply system of the embodiment of the present application.

[0163] The input / output interface 903 is used to implement information input and output.

[0164] The communication interface 904 is used to realize the communication interaction between this device and other devices. Communication can be realized through wired methods (such as USB, network cable, etc.) or wireless methods (such as mobile network, WIFI, Bluetooth, etc.).

[0165] The bus 905 transmits information between various components of the device (eg, the processor 901 , the memory 902 , the input / output interface 903 , and the communication interface 904 ).

[0166] The processor 901 , the memory 902 , the input / output interface 903 and the communication interface 904 are connected to each other in communication within the device via a bus 905 .

[0167] An embodiment of the present application also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the control method of the above-mentioned zero-overcurrent type uninterruptible power supply system is implemented.

[0168] It can be understood that the contents of the above method embodiments are all applicable to the present storage medium embodiments, the functions specifically implemented by the present storage medium embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0169] The memory, as a non-transient computer-readable storage medium, can be used to store non-transient software programs and non-transient computer executable programs. In addition, the memory may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some embodiments, the memory may optionally include a memory remotely disposed relative to the processor, and these remote memories may be connected to the processor via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0170] The embodiments described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Those skilled in the art will appreciate that with the evolution of technology and the emergence of new application scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0171] Those skilled in the art will appreciate that the technical solutions shown in the figures do not constitute a limitation on the embodiments of the present application, and may include more or fewer steps than shown in the figures, or a combination of certain steps, or different steps.

[0172] The system embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment.

[0173] Those skilled in the art will appreciate that all or some of the steps in the methods disclosed above, and the functional modules / units in the systems and devices may be implemented as software, firmware, hardware, or a suitable combination thereof.

[0174] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0175] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but the scope of the rights of the present invention is not limited thereto. Any modification, equivalent substitution and improvement made by a person skilled in the art without departing from the scope and essence of the present invention should be within the scope of the rights of the present invention.

Claims

1. A zero-overcurrent uninterruptible power supply system, characterized in that: The zero-overcurrent uninterruptible power supply system includes multiple input circuits, an output bus, a central control unit and a static power conversion device; The multi-input circuit includes a main power supply circuit and a backup power supply circuit, and the multi-input circuit is used to obtain AC power from the power supply side; The static power conversion device comprises a first switch group and a second switch group, wherein the first switch group and the second switch group comprise a plurality of switches; the static power conversion device is any one of a mechanical contactor or a relay, and is used to ensure safe electrical isolation during the power switching process; The main power supply circuit and the backup power supply circuit are connected in parallel to the output bus, wherein the main power supply circuit is connected to the output bus through the first switch group, and the backup power supply circuit is connected to the output bus through the second switch group, and the output bus is used to supply power to the load side; A microprocessor is embedded in the central control unit, and the microprocessor is used to detect the action time of each switch of the static power conversion device and calculate the AC zero-crossing time required for predictive control of each switch; The central control unit is connected to the first switch group and the second switch group respectively. The central control unit is used to control the first switch group to disconnect at the AC zero-crossing point according to the action time when the main power supply circuit fails, and control the second switch group to close at the AC zero-crossing point.

2. The zero-transition power type uninterruptible power supply system according to claim 1, characterized in that: The power supply side includes grid power, green power, power output by an energy storage inverter, or power output by a local generator.

3. The zero-transition power type uninterruptible power supply system according to claim 1, characterized in that: Each input end of the multi-input circuit is provided with a power circuit breaker, and the power circuit breaker is used for short-circuit protection of the power supply side; Each of the multiple input circuits is embedded with a voltage transformer, which dynamically detects the voltage state and uses the voltage state as feedback information for relay protection and power supply side health status diagnosis; Each line on the load side is provided with a current transformer, which dynamically detects the current state and uses the current state as feedback information for relay protection.

4. The zero-transition power type uninterruptible power supply system according to claim 1, characterized in that: The zero-overcurrent uninterruptible power supply system further comprises a local display connected to the microprocessor; The microprocessor is also used to dynamically detect the power operation parameters of each of the multiple input circuits, and to make online analysis and control decisions based on the power operation parameters, wherein the power operation parameters include voltage, current, power, power factor and temperature; The on-site display is used to display the numerical value and process curve of the power operation parameter, and at the same time display the online operation status of the zero-overcurrent type uninterruptible power supply system; The local display is also used to display the values ​​of preset parameters, wherein the preset parameters include relay protection parameters, switching condition parameters and extreme state parameters.

5. The zero-transition power type uninterruptible power supply system according to claim 1, characterized in that: The zero-overcurrent uninterruptible power supply system further includes a network communication unit and a cloud management platform, wherein the network communication unit is connected to the central control unit, and the cloud management platform performs information exchange with the network communication unit; The cloud management platform is used to actively send a circuit switching instruction; The network communication unit is used to receive the circuit switching instruction and send the circuit switching instruction to the central control unit; The central control unit responds to the loop switching instruction, controls the first switch group to be disconnected at the AC zero crossing moment according to the action time, and controls the second switch group to be closed at the AC zero crossing moment, or controls the second switch group to be disconnected at the AC zero crossing moment according to the action time, and controls the first switch group to be closed at the AC zero crossing moment.

6. The zero-transition power type uninterruptible power supply system according to claim 1, characterized in that: When the alternating current is three-phase electricity, the central control unit is further used to predict the alternating current zero-crossing moment of each phase in phase, and perform switching between the multiple input circuits in phase at the alternating current zero-crossing moment.

7. The zero-transition power type uninterruptible power supply system according to claim 1, characterized in that: When there are multiple power transformers supplying power on the power supply side, the central control unit is also used to dynamically control the zero-overload uninterruptible power supply system to switch to the side with the largest load of the power transformer according to the load rate of the multiple power transformers when the load of the power transformers is unbalanced, so as to enable the load to be continuously transferred between the multiple power transformers to maintain load balance.

8. A control method for a zero-overcurrent uninterruptible power supply system, characterized in that: Applied to the zero-transition power type uninterruptible power supply system according to any one of claims 1 to 7, the control method comprises the following steps: Obtain AC power from the power supply side through multiple input circuits; The microprocessor detects the action time of each switch of the static power conversion device and calculates the AC zero-crossing time required for predictive control of each switch; When the main power supply circuit fails, the central control unit controls the first switch group to be disconnected at the AC zero-crossing point according to the action time, and controls the second switch group to be closed at the AC zero-crossing point.

9. An electronic device, characterized in that: The electronic device comprises a memory and a processor, the memory stores a computer program, and the processor implements the control method of claim 8 when executing the computer program.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the control method of claim 8 is implemented.

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