Uninterruptible power supply, control method and computer readable storage medium

Abstract

An uninterruptible power supply, a control method and a computer readable storage medium are used for improving the electric energy utilization rate of a new energy system. The uninterruptible power supply comprises a rectification circuit, an inversion circuit, a battery module, a controller and a detection circuit. The input end of the rectification circuit is connected with an AC power supply, the output end is connected with the input end of the inversion circuit, and the rectification circuit converts AC output by the AC power supply into DC and outputs the DC to the inversion circuit. The input end of the inverter circuit is connected with the battery module and is also connected with one end for outputting direct current in the new energy system, and the output end is connected with a load; the battery module receives and stores the electric energy output by the new energy system and / or the rectifying circuit, or outputs the stored electric energy to the inverter circuit; the detection circuit is connected with the AC power supply and the new energy system and detects output voltage and output current of the AC power supply and the new energy system. The controller is connected with the rectification circuit, the new energy system and the detection circuit, and is used for adjusting the output power of the rectification circuit and the new energy system.

Description

Technical Field

[0001] This application relates to the field of power electronics, and particularly to an uninterruptible power supply, a control method, and a computer-readable storage medium. Background Art

[0002] An uninterruptible power supply (UPS) is a system that can provide an uninterrupted power supply to a load. A battery is provided inside the UPS or the UPS is connected to a battery. When the power grid is normal, the UPS converts the grid voltage into the supply voltage for the load and supplies the supply voltage to the load for use. When the power grid fails, the voltage stored in the battery is converted into the supply voltage and supplied to the load for use, thereby meeting the power consumption requirements of the load.

[0003] To ensure the power supply stability of the UPS, the UPS is generally connected to two power supply sources. One of the power supply sources is the power grid, and the other power supply source can be a diesel generator or other power sources. After the UPS starts running, it can receive the alternating current output by any one of the power supply sources and convert it into the supply voltage for the load and supply power to it. As the proportion of new energy in the power grid gradually increases, a part of the electric energy in the power grid is generated after the electric energy of the new energy system is grid-connected. However, due to the restrictions of the grid connection policies in some regions, some new energy projects fail to be connected to the grid, resulting in a low utilization rate of the electric energy of the new energy system. Summary of the Invention

[0004] This application provides an uninterruptible power supply, a control method, and a computer-readable storage medium for improving the utilization rate of the electric energy of the new energy system.

[0005] The specific technical solutions provided by the embodiments of this application are as follows:

[0006] In a first aspect, the embodiments of this application provide an uninterruptible power supply. The uninterruptible power supply is respectively connected to an AC power supply such as the power grid and one end of the new energy system that outputs direct current, and can obtain electric energy from any of the above devices and use the obtained electric energy to supply power to the load connected at the back end. The uninterruptible power supply includes: a rectifier circuit, an inverter circuit, a battery module, a controller, and a detection circuit

[0007] Among them, the input end of the rectifier circuit is used to connect to an AC power supply, the output end of the rectifier circuit is connected to the input end of the inverter circuit, and the rectifier circuit is used to convert the alternating current output by the AC power supply into direct current and output it to the inverter circuit; the input end of the inverter circuit is connected to the battery module and is also used to connect to one end of the new energy system that outputs direct current. The output end of the inverter circuit is used to connect to a load, and the inverter circuit is used to convert the received direct current into the supply voltage of the load and supply power to the load; the battery module includes at least one set of storage batteries, which is used to receive and store the electric energy output by the new energy system and / or the rectifier circuit, or output the stored electric energy to the inverter circuit; the detection circuit is used to connect to the AC power supply and the new energy system and detect the output voltage and output current of the AC power supply and the new energy system; the controller is respectively connected to the rectifier circuit, the new energy system and the detection circuit, and is used to adjust the output power of the rectifier circuit and the new energy system according to the values detected by the detection circuit.

[0008] Using the above uninterruptible power supply, the uninterruptible power supply can directly obtain electric energy from the new energy system. Since the electric energy generated by the new energy system is not restricted by grid connection and the loss of electric energy during the grid connection process is reduced, it is beneficial to improve the utilization rate of electric energy of the new energy system. In addition, since the electric energy output by the new energy system can be directly transmitted to the inverter circuit without passing through the rectifier circuit, the loss of electric energy on the inverter circuit is also reduced. Therefore, it is also beneficial to improve the working efficiency of the uninterruptible power supply.

[0009] In a possible design, when the amplitude of the alternating current output by the AC power supply is the same as the voltage amplitude of the load connected to the uninterruptible power supply, in order to improve the power supply efficiency, the uninterruptible power supply further includes a switch circuit. One end of the switch circuit is used to connect to the AC power supply, and the other end of the switch circuit is used to connect to the load. When the switch circuit is closed, the AC power supply can directly supply power to the load, reducing the loss of electric energy on the rectifier circuit and the inverter circuit. In addition, with the above design, when the rectifier circuit or the inverter circuit fails, the above switch circuit can also be used for power transmission to improve the power supply stability of the uninterruptible power supply.

[0010] In a possible design, the battery module further includes a battery charger. One end of the battery charger is connected to the input end of the inverter circuit, and the other end of the battery charger is connected to at least one set of storage batteries. With the above design, the charging process and discharging process of the battery module can be controlled by using the battery charger.

[0011] In a possible design, in order to improve the charging efficiency of the battery module, the new energy system is connected to the input end of the inverter circuit through the battery charger. With the above design, the new energy system can directly charge all the storage batteries in the battery module without passing through the battery charger.

[0012] In a possible design, the controller is further configured to adjust the output voltages of the rectifier circuit and the new energy system according to the remaining capacity of at least one battery pack.

[0013] With the above uninterruptible power supply, since the batteries in the battery module are directly connected to the new energy system and the rectifier circuit, during the charging process of the batteries, as the remaining capacity increases, the demand for the charging voltage by the batteries also changes. To meet the charging requirements of the batteries, the controller needs to adjust the output voltages of the rectifier circuit and the new energy system according to the remaining capacity of the batteries.

[0014] In a second aspect, an embodiment of the present application provides a control method for an uninterruptible power supply. The control method can be applied to the uninterruptible power supply provided in the first aspect and any possible design thereof in the present application, and is executed by the controller in the uninterruptible power supply. The control method for the uninterruptible power supply includes the following steps: obtaining the output voltages and output currents of the AC power supply and the new energy system; determining the operating states of the AC power supply and the new energy system according to the output voltages and output currents of the AC power supply and the new energy system; and adjusting the output powers of the new energy system and the rectifier circuit according to the operating states of the AC power supply and the new energy system.

[0015] In a possible design, adjusting the output powers of the new energy system and the rectifier circuit according to the operating states of the AC power supply and the new energy system includes: when it is determined that the AC power supply fails, adjusting the output power of the new energy system to a first preset threshold. The first preset threshold is the sum of the power supplied to the load and the charging power of the battery module, or the difference between the power supplied to the load and the discharging power of the battery module. With the above design, when the AC power supply fails, if the electric energy output by the new energy system cannot meet the power supply requirements of the load, the battery module and the new energy system can be controlled to jointly supply power to meet the power supply requirements of the load. When the electric energy output by the new energy system is greater than the power demand of the load, a part of the electric energy output by the new energy system is used to supply power to the load, and the other part is output to the battery module for storage.

[0016] In a possible design, adjusting the output powers of the new energy system and the rectifier circuit according to the operating states of the AC power supply and the new energy system includes: when it is determined that both the AC power supply and the new energy system are normal, controlling the output power of the new energy system to a second preset threshold, and controlling the output power of the rectifier circuit to a third preset threshold, where the second preset threshold is greater than or equal to the third preset threshold. With the above design, when both the AC power supply and the new energy system are operating normally, the power supply quality requirements of the load can be used to control the new energy system and the AC power supply to each supply a part of the electric energy to supply power to the load.

[0017] In a possible design, in order to further improve the power utilization efficiency of the new energy system, the third preset threshold can be set to a value greater than or equal to zero. That is, in the case where the load connected to the back end of the uninterruptible power supply has low requirements for power supply quality, the new energy system can be used to provide all the power consumption needs of the load.

[0018] In a possible design, the method further includes: adjusting the output voltages of the new energy system and the rectifier circuit according to the remaining power of at least one set of storage batteries.

[0019] In a possible design, the operating states of the AC power supply and the new energy system are determined according to the output voltages and output currents of the AC power supply and the new energy system, including: when it is determined that the output voltage of the AC power supply or the new energy system exceeds the set voltage range, it is determined that the device with the output voltage exceeding the voltage range has a fault; and when it is determined that the output current of the AC power supply or the new energy system exceeds the set current range, it is determined that the device with the output current exceeding the current range has a fault.

[0020] In a third aspect, an embodiment of the present application provides a computer-readable storage medium. A computer program is stored in the computer-readable storage medium. When the computer program runs on a computer, it executes the control method of the uninterruptible power supply provided in the second aspect and any of its designs in the embodiment of the present application.

[0021] In addition, for the technical effects brought by the third aspect and any of its possible designs, reference can be made to the technical effects brought by different designs in the second aspect of the embodiment of the present application, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 Structural schematic diagram of an uninterruptible power supply provided by an embodiment of the present application Figure 1 ;

[0024] Figure 2 Structural schematic diagram of an uninterruptible power supply provided by an embodiment of the present application Figure 2 ;

[0025] Figure 3 Structural schematic diagram of an uninterruptible power supply provided by an embodiment of the present application Figure 3 ;

[0026] Figure 4Structural schematic of an uninterruptible power supply provided by an embodiment of the present application Figure 4 ;

[0027] Figure 5 Structural schematic of an uninterruptible power supply provided by an embodiment of the present application Figure 5 ;

[0028] Figure 6 Flow schematic diagram of a control method for an uninterruptible power supply provided by an embodiment of the present application. Detailed implementation manners

[0029] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0030] The terms used in the implementation manners of the present application are only used to explain specific embodiments of the present application, rather than to limit the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0031] Hereinafter, some terms in the embodiments of the present application will be explained to facilitate the understanding of those skilled in the art.

[0032] (1) The terms "first", "second", etc. in the embodiments of the present application are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here.

[0033] (2) The term "plurality" in the embodiments of the present application means two or more, and other quantifiers are similar thereto.

[0034] (3) The "and / or" in the embodiments of the present application describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone, where A and B can be singular or plural.

[0035] (4) The "connection" in the embodiments of the present application can be understood as electrical connection or communication connection. The electrical connection of two electrical components can be a direct or indirect connection between the two electrical components. For example, when A is connected to B, it can be either a direct connection between A and B or an indirect connection between A and B through one or more other electrical components. For example, when A is connected to B, it can also be a direct connection between A and C, a direct connection between C and B, and the connection between A and B is realized through C. The communication connection of two electrical components connected is a wireless connection between the two electrical components, that is, an electromagnetic connection between the two electrical components.

[0036] (5) The switches in the embodiments of the present application may include, but are not limited to: relays, metal oxide semiconductor field effect transistors (MOSFETs), bipolar junction transistors (BJTs), insulated gate bipolar transistors (IGBTs), silicon carbide (SiC) transistors, and silicon controlled rectifiers (SCRs). The packaging form of each switching tube may be single-tube packaging or multi-tube packaging, and the embodiments of the present application do not impose many restrictions on this. Each switching device may include a first end, a second end, and a control end. The control end may control the conduction or cutoff of the switching tube according to the received electrical signal. When the switching device is conducting, current can be transmitted between the first end and the second end of the switching device. When the switching device is cutoff, current cannot be transmitted between the first end and the second end of the switching device. Taking the MOSFET as an example, the control end of the switching device is the gate, the first end of the switching device may be the source, and the second end may be the drain, or the first end may be the drain and the second end may be the source.

[0037] It should be noted that the SCR is a unidirectional thyristor and can only achieve unidirectional current transmission, and when there is no diode configured at both ends of the MOSFET, it can also only achieve unidirectional current transmission. Therefore, in order to achieve bidirectional current transmission, generally two SCRs or two MOSFETs are used in cooperation.

[0038] The embodiments of the present application provide an uninterruptible power supply, a control method, and a computer-readable storage medium for improving the power utilization efficiency of a new energy system.

[0039] The technical solution of the present application can be summarized as follows: The uninterruptible power supply is not only connected to an AC power supply such as the mains power, but also directly connected to one end of the new energy system that outputs direct current. Therefore, the electric energy generated by the new energy system is not restricted by grid connection and can directly supply power to the uninterruptible power supply, thereby improving the power utilization efficiency of the new energy system. In addition, the electric energy output from the new energy system to the uninterruptible power supply can be directly output to the inverter circuit without passing through the rectifier circuit in the uninterruptible power supply, reducing the power loss on the rectifier circuit and being beneficial to improving the efficiency of the uninterruptible power supply.

[0040] See Figure 1 As shown, it is a schematic structural diagram of an uninterruptible power supply provided by the embodiments of the present application. The uninterruptible power supply can be connected to an AC power supply such as the mains power and can also be directly connected to one end of the new energy system that outputs direct current.

[0041] Among them, the new energy system includes but is not limited to: photovoltaic power generation system, wind power generation system, and water conservancy discharge system. The uninterruptible power supply can be connected to one end of the DC output in any of the above new energy systems. Taking the photovoltaic power generation system as an example of the new energy system, the uninterruptible power supply can be connected to the DC converter in the photovoltaic power generation system that is connected to multiple photovoltaic cells. Taking the wind power generation system as an example of the new energy system, the uninterruptible power supply can be connected to the inverter circuit in the wind power generation system that is connected to the wind turbine. Of course, when the new energy system is other power generation systems, the uninterruptible power supply can be connected to the new energy system in other ways, which will not be introduced one by one here in this application.

[0042] As Figure 1 shown, the uninterruptible power supply can include a rectifier circuit, an inverter circuit, a battery module, a controller, and a detection circuit.

[0043] It should be understood that Figure 1 the structure of the uninterruptible power supply shown is only an example. In actual applications, the uninterruptible power supply can have more components than Figure 1 shown in. For example, a filter circuit can also be provided on the input side of the uninterruptible power supply, and an output capacitor can be provided on the output side of the uninterruptible power supply. Among them, Figure 1 the various components shown in can be implemented in hardware, software, or a combination of hardware and software including one or more signal processing and / or application-specific integrated circuits.

[0044] Referring to Figure 1 shown, the input end of the rectifier circuit is used to connect to an AC power supply including the power grid, and the output end of the rectifier circuit is connected to the input end of the inverter circuit. The rectifier circuit has the function of rectifying electric energy, and can convert the alternating current output by the AC power supply into direct current and output it to the inverter circuit. The input end of the inverter circuit is connected to the battery module, and this input end is also used to connect to one end of the DC output in the new energy system. The output end of the inverter circuit is used to connect to the load. The inverter circuit has the function of inverting, and can convert the received direct current into the supply voltage of the load and supply power to the load; the battery module includes at least one group of storage batteries, which is used to receive the electric energy output by the new energy system and / or the rectifier circuit and store it, or output the stored electric energy to the inverter circuit. The detection circuit is used to connect to the AC power supply and the new energy system, and detect the output voltage and output current of the AC power supply and the new energy system. The controller is respectively connected to the rectifier circuit, the new energy system, and the detection circuit, and is used to control the output power of the rectifier circuit and the new energy system according to the values detected by the detection circuit.

[0045] In actual application, in addition to the above-mentioned devices, the uninterruptible power supply may further include a housing. Among them, the rectifier circuit, the inverter circuit, the battery module, the controller, and the detection circuit are all located inside the housing, and at least three groups of external interfaces are provided on the housing. The first group of external interfaces is connected to the input end of the rectifier circuit, and the AC power supply can be connected to the uninterruptible power supply through the above-mentioned external interfaces and cables. The second group of external interfaces is connected to the input end of the inverter circuit, and the new energy system can be connected to the uninterruptible power supply through the above-mentioned external interfaces and cables. The third group of external interfaces is connected to the output end of the inverter circuit, and the load can be connected to the uninterruptible power supply through the above-mentioned external interfaces and cables. Among them, the first group of external interfaces and the second group of external interfaces are the interfaces for the uninterruptible power supply to receive electric energy, and the third group of external interfaces is the interface for the uninterruptible power supply to output electric energy.

[0046] Next, each of the multiple devices in the uninterruptible power supply will be introduced in combination with embodiments.

[0047] In the uninterruptible power supply provided in the present application, both the rectifier circuit and the inverter circuit include multiple switching devices. The controller can control the rectifier circuit to perform rectification operations by controlling the conduction and cutoff of the switching devices in the rectifier circuit. Similarly, the controller can control the inverter circuit to perform inversion operations by controlling the conduction and cutoff of the switching devices in the inverter circuit.

[0048] In a possible implementation manner, the rectifier circuit and the inverter circuit have a voltage regulation function, and can perform conversion processing on the amplitude of the received electric energy to meet the requirements of the load connected to the backend for the amplitude of the supply voltage. Among them, the voltage regulation functions of the rectifier circuit and the inverter circuit are both realized by controlling the conduction and cutoff of the internal switching devices.

[0049] In an example, in addition to the above-mentioned multiple switching devices in the rectifier circuit, a sub-controller connected to the multiple switching devices is further included. The sub-controller can provide control signals for the connected switching devices and control the conduction and cutoff of the switching devices through the control signals. In addition to the above-mentioned multiple switching devices in the inverter circuit, a sub-controller connected to the multiple switching devices is further included. The sub-controller can provide control signals for the connected switching devices and control the conduction and cutoff of the switching devices through the control signals. Among them, the controller is respectively connected to the sub-controllers in the rectifier circuit and the inverter circuit, and controls the operation of the rectifier circuit and the inverter circuit through the sub-controllers in the rectifier circuit and the inverter circuit.

[0050] In another example, the switching devices in the rectifier circuit and the inverter circuit are directly connected to the controller in the uninterruptible power supply. The controller can provide control signals for the switching devices in the rectifier circuit and the inverter circuit, and control the conduction and cutoff of the switching devices through the control signals, thereby controlling the operation of the rectifier circuit and the inverter circuit.

[0051] It should be noted that the rectifier circuit and the inverter circuit can be devices with rectification function and inversion function in the prior art respectively. Such devices can be composed of multiple discrete devices or composed of an integrated chip and peripheral circuits. This application does not make any limitations here.

[0052] In a possible implementation manner, when the voltage amplitude of the alternating current output by the AC power supply is the same as the supply voltage amplitude of the load, in order to improve the efficiency of the uninterruptible power supply, refer to Figure 2 As shown, the uninterruptible power supply may further include a switching circuit. One end of the switching circuit is used to connect to the AC power supply, and the other end of the switching circuit is used to connect to the load.

[0053] In actual application, the switching circuit includes at least one switching device. When all the switching devices in the switching circuit are turned on, the switching circuit constitutes a power supply path between the AC power supply and the load. The alternating current output by the AC power supply can be transmitted to the load through the above power supply path and supply power to the load. When any one of the switching devices in the switching circuit is turned off, the connection between the AC power supply and the load is disconnected.

[0054] In one example, the control end of the above switching device can be connected to a controller, and the controller can send a control signal to the above switching device to control the on and off of the switching device.

[0055] In the uninterruptible power supply provided by the embodiments of the present application, the battery module includes at least one group of storage batteries. The storage batteries can be, but are not limited to: nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, lead storage batteries, lithium-ion batteries, and polymer lithium-ion batteries.

[0056] In one example, when the battery module includes multiple groups of storage batteries, the multiple groups of storage batteries can be connected in series, that is, the negative electrode of the first group of storage batteries is connected to the positive electrode of the second group of storage batteries, the negative electrode of the second group of storage batteries is connected to the positive electrode of the third group of storage batteries, and so on, to connect all groups of storage batteries. Among them, the positive electrode of the first group of storage batteries is the positive electrode of the battery module, and the negative electrode of the last group of storage batteries is the negative electrode of the battery module.

[0057] In another example, when the battery module includes multiple groups of storage batteries, the multiple groups of storage batteries can be connected in parallel. The positive electrodes of all groups of storage batteries are connected and used as the positive electrode of the battery module, and the negative electrodes of all groups of storage batteries are connected and used as the negative electrode of the battery module.

[0058] In a possible implementation, the battery module further includes a battery charger connected to at least one set of storage batteries. The battery charger has a voltage regulation function, can regulate the charging voltage received from the input end of the inverter circuit and charge at least one set of storage batteries, and can also regulate the electrical energy stored in at least one set of storage batteries and output it to the input end of the inverter circuit. Among them, the battery charger can be a DC converter, which is internally provided with a plurality of switching devices. By controlling the conduction and cutoff of the above-mentioned plurality of switching devices, the charging process and discharging process of the battery module are controlled.

[0059] In the uninterruptible power supply provided by the embodiment of the present application, the detection circuit is respectively connected to the AC power supply and the new energy system, can detect the output current and output voltage of the AC power supply and the new energy system, and output the detected output current and output voltage to the controller, so that the controller can use the current value and voltage value detected by the detection circuit to monitor the operating conditions of the AC power supply and the new energy system.

[0060] In a possible implementation, the detection circuit includes at least two voltage sensors and at least two current sensors. One voltage sensor is connected to the AC power supply and detects the output voltage of the AC power supply, and the other voltage sensor is connected to the new energy system and detects the output voltage of the new energy system. One current sensor is connected to the AC power supply and detects the output current of the AC power supply, and the other current sensor is connected to the new energy system and detects the output current of the new energy system. Among them, the output voltage of the new energy system is the voltage at one end of the new energy system that outputs direct current, and the output current of the new energy system is the current at one end of the new energy system that outputs direct current.

[0061] In an example, interfaces are provided on the detection circuit and the controller. The detection circuit and the controller can be connected through the above interfaces and cables. In this case, the detection circuit can be regarded as a device independent of the controller.

[0062] In an example, the detection circuit is located on the controller.

[0063] In the uninterruptible power supply provided by the embodiment of the present application, the controller is respectively connected to the detection circuit, the rectification circuit and the inverter circuit, and is used to obtain the output voltage and output current of the new energy system and the AC power supply detected by the detection circuit, monitor the operating conditions of the AC power supply and the new energy system according to the obtained output voltage and output current, and adjust the output power of the inverter circuit and the rectification circuit according to the operating conditions of the AC power supply and the new energy system.

[0064] Specifically, the controller can compare the output current and output voltage of the AC power supply and the new energy system with the set voltage range and current range to determine the operating states of the new energy system and the AC power supply. For example, the voltage range and current range corresponding to the AC power supply, as well as the voltage range and current range corresponding to the new energy system, can be pre-stored in the controller. The controller can obtain the output voltage of the AC power supply, the output current of the AC power supply, the output voltage of the new energy system, and the output current of the new energy system through a detection circuit. When the controller determines that the output current of the AC power supply exceeds the stored current range corresponding to the AC power supply, or the output voltage of the AC power supply exceeds the stored voltage range corresponding to the AC power supply, it can determine that the AC power supply has a fault and cannot supply power to the uninterruptible power supply normally. Similarly, when the controller determines that the output current of the new energy system exceeds the stored current range corresponding to the new energy system, or the output voltage of the new energy system exceeds the stored voltage range corresponding to the new energy system, it can determine that the new energy system has a fault and cannot supply power to the uninterruptible power supply normally.

[0065] In a possible implementation, when the controller determines that the AC power supply has a fault, the controller can control the new energy system to supply power and control the output power of the new energy system to be a first preset threshold. Among them, when the battery module needs to be charged, the first preset threshold is the sum of the power supply power of the load and the charging power of the battery module. When the battery module does not need to be charged, the charging power of the battery module is zero, that is, the first preset threshold is the power supply power of the load. The controller is also used to control the battery module to discharge when the power output by the new energy system cannot meet the power supply demand of the load. At this time, the sum of the power output by the new energy system and the discharge power of the battery module can meet the power supply power of the load. Generally, the new energy system is controlled to output the maximum power.

[0066] In a possible implementation, when the controller determines that the new energy system has a fault, the controller can control the AC power supply to provide the electric energy required for load power supply and battery module charging, or when the power output by the AC power supply cannot meet the power supply demand of the load, it can control the battery module and the AC power supply to supply power together to meet the power supply demand of the load.

[0067] In a possible implementation, when the controller determines that both the new energy system and the AC power supply can supply power normally, the controller can control the output power of the new energy system to be a second preset threshold and control the output power of the rectifier circuit to be a third preset threshold. Among them, the second preset threshold is greater than or equal to the third preset threshold, and the values of the second preset threshold and the third preset threshold can be set according to the quality requirements of the load for the supplied electric energy.

[0068] In one example, in a scenario where the load has low requirements for power supply quality, to improve the power utilization rate of the new energy system, when both the new energy system and the AC power supply can supply power normally, the third preset threshold can be set to zero. That is, the controller can control the rectifier circuit connected to the AC power supply to stop working, and control the new energy system to provide the electric energy required for load power supply and battery module charging. Or when the power output by the new energy system cannot meet the power supply demand of the load, the controller can control the battery module and the new energy system to supply power together to meet the power supply demand of the load.

[0069] In another example, when both the new energy system and the AC power supply can supply power normally, to balance the power utilization rate and power supply quality of the new energy system, the output powers of the new energy system and the rectifier circuit can be controlled according to a preset power distribution ratio. The power distribution ratio is the proportion of the output powers of the new energy system and the rectifier circuit to the total electric energy required by the uninterruptible power supply. For example, a power distribution ratio of 7:3 indicates that the output power of the new energy system is 0.7 of the total electric energy required by the uninterruptible power supply, and the output power of the rectifier circuit is 0.3 of the total electric energy required by the uninterruptible power supply. Of course, the power distribution ratio can also be set to other values, which are specifically selected according to the application scenario, and are not limited too much here in this application.

[0070] In actual application, the output power of the AC power supply can be adjusted by controlling the operation of the rectifier circuit connected to the AC power supply, and the output power of the new energy can be adjusted by controlling the device connected to the uninterruptible power supply in the new energy system. For example, taking the new energy system as a photovoltaic power generation system, the controller is connected to the DC converter in the photovoltaic power generation system, and by controlling the on and off of the switch in the DC converter, the output power of the DC converter is controlled, thereby adjusting the power output by the new energy system to the uninterruptible power supply.

[0071] The above is the introduction of multiple devices in the uninterruptible power supply. In actual application, according to the structure of the battery module and the access mode of the new energy system, the uninterruptible power supply provided by the embodiments of this application can include multiple circuit structures. Next, the multiple circuit structures of the uninterruptible power supply will be introduced one by one in combination with the embodiments.

[0072] See Figure 3 As shown, it is a schematic structural diagram of an uninterruptible power supply provided by the embodiments of this application. As Figure 3 shown, the uninterruptible power supply includes a rectifier circuit, an inverter circuit, a controller, and a battery module. Among them, the battery module includes at least one group of storage batteries and a battery charger.

[0073] Specifically, the input end of the rectifier circuit is connected to the AC power supply, and the output end of the rectifier circuit is connected to the input end of the inverter circuit. One end of the battery charger in the battery module is connected to the input end of the inverter circuit, and the other end of the battery charger is connected to at least one set of storage batteries. The input end of the inverter circuit is connected to one end of the new energy system that outputs direct current, and the output end of the inverter circuit is connected to the load. The controller is connected to the inverter circuit, the rectifier circuit, the new energy power generation system, and the detection circuit. The detection circuit is connected to the AC power supply and the new energy system.

[0074] Continue to refer to Figure 3 As shown, the controller can monitor the operating states of the AC power supply and the new energy system by using the values detected by the detection circuit, and based on the output powers of the AC power supply and the new energy system. Since the battery module is equipped with a battery charger for controlling the charging process and discharging process of the battery module, when it is necessary to perform a charging operation or a discharging operation on the battery module, it can be achieved by controlling the conduction and cutoff of the switch in the battery charger.

[0075] In a possible implementation manner, in order to improve the charging efficiency of the battery module, refer to Figure 4 As shown, one end of the new energy system that outputs direct current can be connected to the input end of the inverter circuit through the battery charger. At this time, the new energy system can directly charge at least one set of storage batteries, and the charging power and charging voltage can be achieved by controlling the device that outputs direct current in the new energy system.

[0076] Refer to Figure 5 As shown, it is a schematic structural diagram of another uninterruptible power supply provided by an embodiment of the present application. As Figure 5 shown, the uninterruptible power supply includes a rectifier circuit, an inverter circuit, a controller, and a battery module. Among them, the battery module only includes at least one set of storage batteries.

[0077] Specifically, the input end of the rectifier circuit is connected to the AC power supply, and the output end of the rectifier circuit is connected to the input end of the inverter circuit. At least one set of storage batteries in the battery module is directly connected to the input end of the inverter circuit. The input end of the inverter circuit is connected to one end of the new energy system that outputs direct current, and the output end of the inverter circuit is connected to the load. The controller is connected to the inverter circuit, the rectifier circuit, the new energy power generation system, and the detection circuit. The detection circuit is connected to the AC power supply and the new energy system.

[0078] Continue to refer to Figure 5As shown, the controller can monitor the operating states of the AC power supply and the new energy system by using the values detected by the detection circuit, and based on the output powers of the AC power supply and the new energy system. Since the battery module is not equipped with a battery charger for controlling the charging and discharging processes of the battery module, when a charging operation of the battery module is required, as the voltage of at least one set of storage batteries gradually increases, the demand for the charging voltage by at least one set of storage batteries also changes. Therefore, the controller needs to adjust the output voltages of the new energy system and the rectification circuit according to the charging requirements of the battery module during the charging process of the battery module. Among them, the method for the controller to adjust the output voltages of the energy system and the rectification circuit can be found in the relevant introduction above, and will not be repeated here in this application.

[0079] Combined with the above description, the embodiment of this application also provides a control method for an uninterruptible power supply. This charging control method can be applied to the aforementioned uninterruptible power supply and is executed by the controller in the uninterruptible power supply. Refer to Figure 6 As shown, it mainly includes the following steps:

[0080] Step 601, obtain the output voltages and output currents of the AC power supply and the new energy system.

[0081] Specifically, a detection circuit for detecting the output voltages and output currents of the new energy system and the AC power supply is provided in the uninterruptible power supply, and the controller can use the above detection circuit to obtain the output voltages and output currents of the AC power supply and the new energy system.

[0082] Step 602, determine the operating states of the AC power supply and the new energy system according to the output voltages and output currents of the AC power supply and the new energy system.

[0083] Specifically, the controller can compare the output voltages and output currents of the AC power supply and the new energy system with the set voltage range and current range to determine the operating states of the AC power supply and the new energy system. For example, the voltage range and current range corresponding to the AC power supply, and the voltage range and current range corresponding to the new energy system can be pre-stored in the controller. The controller can obtain the output voltage of the AC power supply, the output current of the AC power supply, the output voltage of the new energy system, and the output current of the new energy system through the detection circuit. When the controller determines that the output current of the AC power supply exceeds the stored current range corresponding to the AC power supply, or the output voltage of the AC power supply exceeds the stored voltage range corresponding to the AC power supply, it can be determined that the AC power supply has a fault and cannot supply power to the uninterruptible power supply normally. Similarly, when the controller determines that the output current of the new energy system exceeds the stored current range corresponding to the new energy system, or the output voltage of the new energy system exceeds the stored voltage range corresponding to the new energy system, it can be determined that the new energy system has a fault and cannot supply power to the uninterruptible power supply normally.

[0084] Step 603: Adjust the output powers of the new energy system and the rectifier circuit according to the operating states of the AC power supply and the new energy system.

[0085] In a possible implementation, when the controller determines that a fault occurs in the new energy system, the controller can control the AC power supply to provide the electric energy required for load power supply and battery module charging, or when the power output by the AC power supply cannot meet the power supply requirements of the load, the controller can control the battery module and the AC power supply to jointly supply power to meet the power supply requirements of the load.

[0086] In a possible implementation, when the controller determines that both the new energy system and the AC power supply can supply power normally, the controller can control the output powers of the new energy system and the rectifier circuit according to the quality requirements of the load for the supplied electric energy. For example, the controller can control the output power of the new energy system to be a second preset threshold value, and control the output power of the rectifier circuit to be a third preset threshold value. Among them, the second preset threshold value is greater than or equal to the third preset threshold value.

[0087] In an example, in a scenario where the load has low requirements for power supply quality, in order to improve the power utilization rate of the new energy system, when both the new energy system and the AC power supply can supply power normally, the controller can set the third preset threshold value to zero, that is, the controller can control the rectifier circuit connected to the AC power supply to stop working, control the new energy system to provide the electric energy required for load power supply and battery module charging, or when the power output by the new energy system cannot meet the power supply requirements of the load, the controller can control the battery module and the new energy system to jointly supply power to meet the power supply requirements of the load.

[0088] In another example, when both the new energy system and the AC power supply can supply power normally, in order to balance the power utilization rate of the new energy system and the power supply quality, the output powers of the new energy system and the rectifier circuit can be controlled according to a preset power distribution ratio. Among them, the power distribution ratio is the ratio of the output powers of the new energy system and the rectifier circuit to the total electric energy required by the uninterruptible power supply. For example, a power distribution ratio of 7:3 indicates that the output power of the new energy system is 0.7 of the total electric energy required by the uninterruptible power supply, and the output power of the rectifier circuit is 0.3 of the total electric energy required by the uninterruptible power supply. Of course, the power distribution ratio can also be set to other values, which are specifically selected according to the application scenario, and this application does not make too many restrictions here.

[0089] In a possible implementation, adjusting the output powers of the new energy system and the rectifier circuit according to the operating states of the AC power supply and the new energy system includes: when it is determined that a fault occurs in the AC power supply, adjusting the output power of the new energy system to a first preset threshold value, where the first preset threshold value is the sum of the load power supply power and the battery module charging power, or the difference between the load power supply power and the battery module discharging power.

[0090] In a possible implementation, according to the operating states of the AC power supply and the new energy system, the output powers of the new energy system and the rectifier circuit are adjusted, including: when it is determined that both the AC power supply and the new energy system are normal, controlling the output power of the new energy system to be a second preset threshold value, and controlling the output power of the rectifier circuit to be a third preset threshold value, where the second preset threshold value is greater than or equal to the third preset threshold value.

[0091] In a possible implementation, the above control method further includes: adjusting the output voltages of the new energy system and the rectifier circuit according to the remaining power of at least one battery pack.

[0092] Based on the above embodiments, an embodiment of the present application further provides a computer-readable storage medium, in which a computer program is stored. When the computer program is executed by a computer, the computer is enabled to implement Figure 5 the method provided in the embodiments shown. Among them, the storage medium can be any available medium that can be accessed by a computer. By way of example but not limited to: the computer-readable medium may include RAM, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM1), CD-ROM or other optical disc storage, magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer.

[0093] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0094] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured article including an instruction device, and the instruction device implements the functions specified in Figure 1 one process or multiple processes and / or Figure 1 one block or multiple blocks.

[0095] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus, so that a series of operation steps are executed on the computer or other programmable apparatus to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable apparatus provide steps for realizing the functions specified in one process or a plurality of processes and / or blocks. Figure 1 one process or a plurality of processes and / or blocks Figure 1 or steps for realizing the functions specified in one block or a plurality of blocks.

[0096] In various embodiments of the present application, if there is no special indication and logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referred to each other, and the technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0097] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the protection scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these changes and modifications.

Claims

1. An uninterruptible power supply, characterized in that, it includes: a rectifier circuit, an inverter circuit, a battery module, a controller and a detection circuit; The input end of the rectifier circuit is used to connect to an AC power supply, the output end of the rectifier circuit is connected to the input end of the inverter circuit, and the rectifier circuit is used to convert the alternating current output by the AC power supply into direct current and output it to the inverter circuit; The input end of the inverter circuit is connected to the battery module and is also used to connect to one end of the new energy system that outputs direct current. The output end of the inverter circuit is used to connect to a load. The inverter circuit is used to convert the received direct current into the supply voltage of the load and supply power to the load; The battery module includes at least one group of storage batteries, which is used to receive the electric energy output by the new energy system and / or the rectifier circuit and store it, or output the stored electric energy to the inverter circuit; The detection circuit is used to connect to the AC power supply and the new energy system, and detect the output voltage and output current of the AC power supply and the new energy system; The controller is respectively connected to the rectifier circuit, the new energy system and the detection circuit, and is used to adjust the output power of the rectifier circuit and the new energy system according to the values detected by the detection circuit.

2. The uninterruptible power supply according to claim 1, characterized in that, The uninterruptible power supply further includes a switch circuit. One end of the switch circuit is used to connect to the AC power supply, and the other end of the switch circuit is used to connect to the load.

3. The uninterruptible power supply according to claim 2, characterized in that, The switch circuit is also connected to the controller and is used to conduct or cut off under the control of the controller.

4. The uninterruptible power supply according to claim 1 or 2, characterized in that, The battery module further includes a battery charger. One end of the battery charger is connected to the input end of the inverter circuit, and the other end of the battery charger is connected to the at least one group of storage batteries.

5. The uninterruptible power supply according to claim 4, characterized in that, The new energy system is connected to the input end of the inverter circuit through the battery charger.

6. The uninterruptible power supply according to claim 1 or 2, characterized in that, The controller is also used to adjust the output voltage of the rectifier circuit and the new energy system according to the remaining capacity of the at least one group of storage batteries.

7. A control method for an uninterruptible power supply, characterized in that, applied to the uninterruptible power supply according to any one of claims 1 to 6, including: acquiring the output voltage and output current of the AC power supply and the new energy system; determining the operating states of the AC power supply and the new energy system according to the output voltage and output current of the AC power supply and the new energy system; adjusting the output power of the new energy system and the rectifier circuit according to the operating states of the AC power supply and the new energy system.

8. The method according to claim 7, characterized in that, The adjusting the output power of the new energy system and the rectifier circuit according to the operating states of the AC power supply and the new energy system includes: When it is determined that the AC power supply fails, adjust the output power of the new energy system to a first preset threshold, where the first preset threshold is the sum of the power supplied to the load and the charging power of the battery module, or the difference between the power supplied to the load and the discharging power of the battery module.

9. The method according to claim 7, wherein, the adjusting the output powers of the new energy system and the rectifier circuit according to the operating states of the AC power supply and the new energy system includes: when it is determined that both the AC power supply and the new energy system are normal, controlling the output power of the new energy system to be a second preset threshold, and controlling the output power of the rectifier circuit to be a third preset threshold, where the second preset threshold is greater than or equal to the third preset threshold.

10. The method according to claim 9, wherein, the third preset threshold is greater than or equal to zero.

11. The method according to claim 7, wherein, the method further includes: adjusting the output voltages of the new energy system and the rectifier circuit according to the remaining power of the at least one set of storage batteries.

12. The method according to claim 7, wherein, the determining the operating states of the AC power supply and the new energy system according to the output voltages and output currents of the AC power supply and the new energy system includes: when it is determined that the output voltage of the AC power supply or the new energy system exceeds the set voltage range, determining that the device with the output voltage exceeding the voltage range fails; and when it is determined that the output current of the AC power supply or the new energy system exceeds the set current range, determining that the device with the output current exceeding the current range fails.

13. A computer-readable storage medium, wherein, the computer-readable storage medium stores a computer program, and when the computer program is executed, the method according to any one of claims 7 - 12 is executed.

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