Energy storage inversion device, control method thereof and energy storage inversion system

Abstract

The invention discloses an energy storage inversion device, a control method thereof and an energy storage inversion system.The energy storage inversion device comprises an energy storage inversion power supply, an auxiliary energy storage module and a first control module, and the energy storage inversion power supply comprises a main energy storage module, an output interface, an expansion interface and the like; the first control module is connected with the auxiliary energy storage modules and is used for comparing the residual electric quantity of the auxiliary energy storage modules with a preset threshold electric quantity, and when the residual electric quantity of each auxiliary energy storage module is smaller than or equal to the threshold electric quantity, the energy storage inversion device is in a first power supply mode; when the residual electric quantity of at least one auxiliary energy storage module is larger than the corresponding threshold electric quantity, the energy storage inversion device is in a second power supply mode, and at the moment, the first control module controls one auxiliary energy storage module to independently supply power to the electric equipment. The overall battery capacity of the energy storage inversion device is large, and the energy storage inversion device can be suitable for more application scenes.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage inverter power supply, and in particular to an energy storage inverter device and a control method thereof, and an energy storage inverter system. Background Art

[0002] As people's living standards improve, energy storage inverter power supplies are widely used to cope with power outages, no power supply outdoors, and inconvenient wiring indoors.

[0003] Due to the volume and weight restrictions of the energy storage inverter power supply, the capacity of the battery pack equipped with the main body of the energy storage inverter power supply is limited. In actual use, the fixed power of its battery greatly limits its power supply time. For example, in application scenarios where it is necessary to power electrical equipment beyond the maximum maintenance time of the battery pack, the energy storage inverter power supply is often powerless, which greatly limits the application of the energy storage inverter power supply. Summary of the invention

[0004] The embodiments of the present application provide an energy storage inverter device and a control method thereof, and an energy storage inverter system, which can solve the problem in the related art that the application scenarios of the energy storage inverter power supply are limited due to the small capacity of the battery pack of the energy storage inverter power supply.

[0005] In a first aspect, an embodiment of the present application provides an energy storage inverter device; the energy storage inverter device includes an energy storage inverter power supply, an auxiliary energy storage module and a first control module, the energy storage inverter power supply includes a main energy storage module, a first DC / AC inverter, a transformer, an AC / DC rectifier, a second DC / AC inverter, at least one output interface and at least one expansion interface, the output end of the main energy storage module is connected to the input end of the first DC / AC inverter, the output end of the first DC / AC inverter is connected to the primary winding of the transformer, the secondary winding of the transformer is connected to the input end of the AC / DC rectifier, the output end of the AC / DC rectifier is connected to the input end of the second DC / AC inverter, the output end of the second DC / AC inverter is connected to each output interface, and the output interface is used to connect to the power-consuming equipment , the number of the auxiliary energy storage modules is at least one, the auxiliary energy storage modules are respectively connected to the input end of the first DC / AC inverter via the corresponding expansion interface, the first control module is connected to the auxiliary energy storage module and is used to compare the remaining power of one or more auxiliary energy storage modules with the corresponding preset threshold power. When the remaining power of each auxiliary energy storage module is less than or equal to the preset threshold power, the energy storage inverter device is in a first power supply mode. In the first power supply mode, the first control module controls the main energy storage module to supply power to the power-consuming device alone. When the remaining power of at least one auxiliary energy storage module is greater than the corresponding preset threshold power, the energy storage inverter device is in a second power supply mode. In the second power supply mode, the first control module controls one of the one or more auxiliary energy storage modules to supply power to the power-consuming device alone.

[0006] Based on the energy storage inverter device of the embodiment of the present application, by designing a secondary energy storage module, the secondary energy storage module can supply power to the power-consuming device through the expansion interface, so that the overall battery capacity of the inverter energy storage device is larger and can be applied to more application scenarios. By designing at least one secondary energy storage module, the first control module compares the remaining power of the secondary energy storage module with the preset threshold power, and when the remaining power of at least one secondary energy storage module is greater than the preset threshold power, the first control module controls one of the one or more secondary energy storage modules currently determined to supply power to the power-consuming device alone, so that the energy storage inverter device is in the second working mode in which the secondary energy storage module has priority over the main energy storage module to supply power to the power-consuming device alone, and until the remaining power of all the secondary energy storage modules is less than or equal to the corresponding preset threshold power, the first control module will control the main energy storage module to supply power to the power-consuming device alone, so that the energy storage inverter device is in the first working mode, so that the energy storage inverter device can realize uninterrupted power supply to the power-consuming device by switching between the secondary energy storage module and the main energy storage module.

[0007] In a second aspect, an embodiment of the present application provides an energy storage inverter system; the energy storage inverter system includes an electrical device and the above-mentioned energy storage inverter device, the number of electrical devices is one or more, and each electrical device is connected to the output interface of the energy storage inverter power supply in a one-to-one correspondence.

[0008] Based on the energy storage inverter system in the embodiment of the present application, the energy storage inverter system having the above-mentioned energy storage inverter device has a larger overall battery capacity of the inverter energy storage device and can be applied to more application scenarios; the switching between the auxiliary energy storage module and the main energy storage module realizes the uninterrupted power supply of the energy storage inverter device to the electrical equipment.

[0009] In a third aspect, an embodiment of the present application provides a control method for an energy storage inverter device, wherein the energy storage inverter device is the above-mentioned energy storage inverter device; the control method comprises:

[0010] Compare the remaining power of each auxiliary energy storage module with the corresponding preset threshold power;

[0011] If the remaining power of each secondary energy storage module is less than or equal to the preset threshold power, the main energy storage module is controlled to supply power to the power supply device alone;

[0012] If the remaining power of at least one subsidiary energy storage module is greater than the corresponding preset threshold power, one of the one or more subsidiary energy storage modules is controlled to supply power to the power-consuming device alone.

[0013] Based on the control method of the energy storage inverter device in the embodiment of the present application, by designing a secondary energy storage module, the secondary energy storage module can supply power to the power-consuming device through the expansion interface, so that the overall battery capacity of the inverter energy storage device is larger and can be applied to more application scenarios. By designing at least one secondary energy storage module, the remaining power of the secondary energy storage module is compared with the preset threshold power, and when the remaining power of at least one secondary energy storage module is greater than the preset threshold power, a secondary energy storage module currently determined in one or more secondary energy storage modules is controlled to supply power to the power-consuming device alone, so that the energy storage inverter device is in the second working mode in which the secondary energy storage module is preferred to the main energy storage module to supply power to the power-consuming device alone, and until the remaining power of all the secondary energy storage modules is less than or equal to the corresponding preset threshold power, the main energy storage module will be controlled to supply power to the power-consuming device alone, so that the energy storage inverter device is in the first working mode, so that the energy storage inverter device can realize uninterrupted power supply to the power-consuming device by switching between the secondary energy storage module and the main energy storage module. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 This is a schematic diagram of the structure of an energy storage inverter device in one embodiment of the present application;

[0016] Figure 2 The waveform diagram of the inverter current on the side where the secondary winding of the transformer is located before the switch tube inside the first DC / AC inverter in the related art reduces the driving duty cycle;

[0017] Figure 3 This is a schematic diagram of the structure of a switch tube inside a first DC / AC inverter in an embodiment of the present application;

[0018] Figure 4 This is a waveform diagram of a switch tube in a DC / AC inverter after reducing the driving duty cycle in an embodiment of the present application;

[0019] Figure 5 This is a waveform diagram of the inverter current on the side where the secondary winding of the transformer is located after the switch tube inside the first DC / AC inverter reduces the driving duty cycle in an embodiment of the present application;

[0020] Figure 6 The figure is a flow chart of a control method of an energy storage inverter device in one embodiment of the present application.

[0021] Figure numerals: 1. energy storage inverter device; 10. energy storage inverter power supply; 11. main energy storage module; 12. first DC / AC inverter; 13. output interface; 14. expansion interface; 15. AC / DC rectifier; Q1. first switch tube; Q2. second switch tube; Q3. third switch tube; Q4. fourth switch tube; T. transformer; 16. second DC / AC inverter; 20. auxiliary energy storage module; 30. first control module; 31. first battery cell manager; 32. second battery cell manager; 40. voltage detection module; 50. second control module; 3. electrical equipment. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0023] Please refer to Figure 1 As shown, the first aspect of the present application proposes an energy storage inverter device 1, which has a large overall battery capacity and can be applied to more application scenarios.

[0024] The energy storage inverter device 1 includes an energy storage inverter power supply 10, an auxiliary energy storage module 20 and a first control module 30. The energy storage inverter power supply 10 includes a main energy storage module 11, a first DC / AC inverter 12, a transformer T, an AC / DC rectifier 15, a second DC / AC inverter 16, at least one output interface 13 and at least one expansion interface 14; the output end of the main energy storage module 11 is connected to the input end of the first DC / AC inverter 12, the output end of the first DC / AC inverter 12 is connected to the primary winding of the transformer T, the secondary winding of the transformer T is connected to the input end of the AC / DC rectifier 15, the output end of the AC / DC rectifier 15 is connected to the input end of the second DC / AC inverter 16, the output end of the second DC / AC inverter 16 is respectively connected to each output interface 13, and the output interface 13 is used to access the power consumption equipment 3; the number of the auxiliary energy storage module 20 is at least one, and the auxiliary energy storage module 2 0 are respectively connected to the input end of the first DC / AC inverter 12 via the corresponding expansion interface 14; the first control module 30 is connected to the auxiliary energy storage module 20 and is used to compare the remaining power of one or more auxiliary energy storage modules 20 with the corresponding preset threshold power; when the remaining power of each auxiliary energy storage module 20 is less than or equal to the preset threshold power, the energy storage inverter device 1 is in the first power supply mode, in which the first control module 30 controls the main energy storage module 11 to supply power to the power-consuming device 3 alone; when the remaining power of at least one auxiliary energy storage module 20 is greater than the corresponding preset threshold power, the energy storage inverter device 1 is in the second power supply mode, in which the first control module 30 controls one of the one or more auxiliary energy storage modules 20 to supply power to the power-consuming device 3 alone.

[0025] The following combination Figure 1-Figure 5 The specific structure of the energy storage inverter device 1 is introduced in detail.

[0026] The energy storage inverter device 1 can be a portable outdoor mobile energy storage power supply device, so that the user can take the energy storage inverter device 1 outdoors to meet the power demand of related power-consuming equipment 3.

[0027] like Figure 1 As shown, the energy storage inverter device 1 includes an energy storage inverter power supply 10 , a secondary energy storage module 20 and a first control module 30 .

[0028] The energy storage inverter power supply 10 includes a main energy storage module 11 , a first DC / AC inverter 12 , a transformer T, an AC / DC rectifier 15 , a second DC / AC inverter 16 , an output interface 13 and an expansion interface 14 .

[0029] The main energy storage module 11 is a component with energy storage function in the energy storage inverter 10. The main energy storage module 11 can supply power to the externally connected electrical equipment 3; of course, when the energy storage inverter 10 is a common energy storage inverter 10, the main energy storage module 11 can store energy released from an external power source (such as a power grid); when the energy storage inverter 10 is a photovoltaic energy storage inverter 10, the main energy storage module 11 can also store energy converted from photovoltaic components (described below) of the photovoltaic energy storage inverter system. The specific structure of the main energy storage module 11 will be described in detail below.

[0030] The first DC / AC inverter 12 is a component in the energy storage inverter device 1 that can convert direct current into alternating current. The input end of the first DC / AC inverter 12 is connected to the output end of the main energy storage module 11, and the first DC / AC inverter 12 can convert the direct current output by the main energy storage module 11 into alternating current.

[0031] The transformer T is used to step up or step down the voltage on the side where the primary winding is located and the voltage on the side where the secondary winding is located, and is used to achieve electrical isolation between the side where the primary winding is located and the side where the secondary winding is located. The primary winding of the transformer T is connected to the output end of the first DC / AC inverter 12 to receive the alternating current converted by the first DC / AC inverter 12 from the direct current output of the main energy storage module 11.

[0032] The AC / DC rectifier 15 can convert the alternating current output by the secondary winding of the transformer T into direct current. The input end of the AC / DC rectifier 15 is connected to the secondary winding of the transformer T to receive the alternating current output by the secondary winding of the transformer T.

[0033] The second DC / AC inverter 16 can convert the direct current outputted from the output end of the AC / DC rectifier 15 into alternating current, and the input end of the second DC / AC inverter is connected to the output end of the AC / DC rectifier 15 to receive the direct current outputted from the output end of the AC / DC rectifier 15. The second DC / AC inverter 16 can convert the direct current of the direct current bus connected to the AC / DC rectifier 15 into alternating current that meets the power demand of the power-consuming device 3, and the alternating current supplies power to the power-consuming device 3 through the output interface 13 of the energy storage inverter power supply 10.

[0034] The output interface 13 serves as an energy output interface in the energy storage inverter 10. Each output interface 13 is connected to the output end of the second DC / AC inverter 16, and the output interface 13 is used to access the power-consuming device 3. The specific type of the output interface 13 is not limited here, and the designer can reasonably design it according to actual needs. For example, the specific type of the output interface 13 can be, but is not limited to, a type-C interface, a USB interface, or a lightning interface, etc.

[0035] The number of output interfaces 13 may be one or more; when the number of output interfaces 13 of the energy storage inverter 10 is one, the energy storage inverter 10 is connected to one power-consuming device 3, so that the main battery module or the auxiliary energy storage module 20 supplies power to the one power-consuming device 3; when the number of output interfaces 13 of the energy storage inverter 10 is more than one, the energy storage inverter 10 may be connected to multiple power-consuming devices 3 at the same time, so that the main energy storage module 11 or the auxiliary energy storage module 20 supplies power to the multiple power-consuming devices 3 at the same time. It should be noted that when the number of output interfaces 13 is more than one, the specific types of the output interfaces 13 may be the same or different.

[0036] The expansion interface 14 serves as the energy input interface in the energy storage inverter 10. The specific type of the expansion interface 14 is not limited here, and designers can make reasonable designs according to actual needs. For example, the specific type of the expansion interface 14 can be but is not limited to a type-C interface, a USB interface, or a lightning interface, etc.

[0037] The number of expansion interfaces 14 can be one or more; when the number of expansion interfaces 14 of the energy storage inverter 10 is one, the energy storage inverter 10 is connected to one auxiliary energy storage module 20 so that the one auxiliary energy storage module 20 supplies power to the power device 3; when the number of expansion interfaces 14 of the energy storage inverter 10 is multiple, the energy storage inverter 10 can be connected to multiple auxiliary energy storage modules 20 at the same time so that the multiple auxiliary energy storage modules 20 supply power to the power device 3 in sequence or according to preset rules. It should be noted that the specific type of the expansion interface 14 and the specific type of the output interface 13 can be the same or different. And when the number of expansion interfaces 14 is multiple, the specific types of the multiple expansion interfaces 14 can be the same or different.

[0038] The auxiliary energy storage module 20 is another element with energy storage function in the energy storage inverter device 1. The auxiliary energy storage module 20 is connected to the input end of the first DC / AC inverter 12 via the expansion interface 14. The first DC / AC inverter 12 can convert the direct current output by the auxiliary energy storage module 20 into alternating current and output it to the transformer T. At least one auxiliary energy storage module 20 is detachably connected to the corresponding expansion interface 14. Such a design facilitates the user to remove the auxiliary energy storage module 20 from the expansion interface 14 of the energy storage inverter 10 to perform operations such as charging on the auxiliary energy storage module 20 on the one hand, and facilitates the user to remove the auxiliary energy storage module 20 from the expansion interface 14 of the energy storage inverter unit to improve the mobility of the energy storage inverter 10 on the other hand.

[0039] The number of the auxiliary energy storage modules 20 may be one or more. When the number of the auxiliary energy storage modules 20 is more than one, the maximum battery capacities of the plurality of auxiliary energy storage modules 20 may be the same or different, and each auxiliary energy storage module 20 is connected to the input end of the first DC / AC inverter 12 via an expansion interface 14 .

[0040] It should be noted that, when the number of expansion interfaces 14 is one, the number of auxiliary energy storage modules 20 may also be one, in which case the one auxiliary energy storage module 20 is connected to the input end of the first DC / AC inverter 12 via the one expansion interface 14. When the number of expansion interfaces 14 is one, the number of auxiliary energy storage modules 20 may also be multiple, in which case only one of the auxiliary energy storage modules 20 is connected to the input end of the first DC / AC inverter 12 via the one expansion interface 14 at a time. When the number of expansion interfaces 14 is multiple, the number of auxiliary energy storage modules 20 may be one, in which case the one auxiliary energy storage module 20 may be connected to the input end of the first DC / AC inverter 12 via any one of the multiple expansion interfaces 14. When the number of expansion interfaces 14 is multiple, the number of auxiliary energy storage modules 20 may also be multiple, in which case each auxiliary energy storage module 20 is connected to the input end of the first DC / AC inverter 12 via one expansion interface 14.

[0041] The first control module 30 is a structural component in the energy storage inverter device 1 for controlling the main energy storage module 11 or the auxiliary energy storage module 20 to supply power to the power supply equipment. The first control module 30 is connected to the main energy storage module 11 and the auxiliary energy storage module 20 respectively. The specific structure of the first control module 30 will be described in detail below.

[0042] The first control module 30 can monitor the remaining power of the auxiliary energy storage module 20 in real time, and the first control module 30 is used to compare the remaining power of the auxiliary energy storage module 20 with the preset threshold power. It should be noted that the specific meaning of the "threshold power" is not limited here, and the designer can set it in advance according to actual needs; for example, the "threshold power" can be understood as the minimum power of the auxiliary energy storage module 20 that can supply the power device 3 to work (such as working at 20% of the rated power), and the "threshold power" can also be understood as the minimum power of the auxiliary energy storage module 20 that can supply the power device 3 to work normally (such as working at the rated power). It should be noted that in this embodiment, each auxiliary energy storage module 20 can correspond to the same preset threshold power, or can correspond to different preset threshold powers respectively, and the preset threshold powers corresponding to different auxiliary energy storage modules 20 can be the same or different.

[0043] When the remaining power of each auxiliary energy storage module 20 is less than or equal to the preset threshold power, the energy storage inverter device 1 is in the first power supply mode, in which the first control module 30 controls the main energy storage module 11 to supply power to the power-consuming device 3 alone. When the remaining power of at least one auxiliary energy storage module 20 is greater than the preset threshold power corresponding thereto, the energy storage inverter device 1 is in the second power supply mode, in which the first control module 30 controls one of the one or more auxiliary energy storage modules 20 to supply power to the power-consuming device 3 alone. That is to say, as long as there is a subsidiary energy storage module 20 whose remaining power is greater than the preset threshold power, the first control module 30 will control the subsidiary energy storage module 20 to supply power to the power-consuming device 3 in priority compared with the main energy storage module 11, until the remaining power of all subsidiary energy storage modules 20 is less than or equal to the above-mentioned preset threshold power, the first control module 30 will control all subsidiary energy storage modules 20 to stop supplying power to the power-consuming device 3, and as long as the power-consuming device 3 still has power demand, the first control module 30 will control the main energy storage module 11 to continue to supply power to the power-consuming device 3 alone.

[0044] It should be noted that, when there are multiple auxiliary energy storage modules 20, the specific values ​​of the preset threshold power corresponding to the multiple auxiliary energy storage modules 20 may be the same or different. When there are multiple auxiliary energy storage modules 20 whose remaining power is greater than the corresponding preset threshold power, the first control module 30 can control any one of the auxiliary energy storage modules 20 to supply power to the power-consuming device 3 in priority compared with the remaining auxiliary energy storage modules 20, until the remaining power of any one of the auxiliary energy storage modules 20 is less than or equal to the corresponding preset threshold power, the first control module 30 will control any other energy storage module in the remaining auxiliary energy storage modules 20 to supply power to the power-consuming device 3 in priority, until the remaining power of any other auxiliary energy storage module 20 is less than or equal to the corresponding preset threshold power, and so on, until the remaining power of all the auxiliary energy storage modules 20 is less than or equal to the corresponding preset threshold power, the first control module 30 will control the main energy storage module 11 to continue to supply power to the power-consuming device 3 alone.

[0045] Based on the energy storage inverter device 1 in the embodiment of the present application, by designing the auxiliary energy storage module 20, the auxiliary energy storage module 20 can supply power to the power-consuming device 3 through the expansion interface 14, so that the overall battery capacity of the inverter energy storage device is larger and can be applied to more application scenarios. By designing at least one auxiliary energy storage module 20, the first control module 30 compares the remaining power of the auxiliary energy storage module 20 with the preset threshold power, and when the remaining power of at least one auxiliary energy storage module 20 is greater than the preset threshold power, the first control module 30 controls one of the one or more auxiliary energy storage modules 20 that is currently determined to supply power to the power-consuming device 3 alone, so that the energy storage inverter device 1 is in the second working mode in which the auxiliary energy storage module 20 is in priority to supply power to the power-consuming device 3 alone compared with the main energy storage module 11, and until all the auxiliary energy storage modules 2 0 is less than or equal to its corresponding preset threshold power, the first control module 30 will control the main energy storage module 11 to supply power to the power-consuming device 3 alone, so that the energy storage inverter device 1 is in the first working mode. Such a design, on the one hand, realizes the uninterrupted power supply of the energy storage inverter device 1 to the power-consuming device 3 through the switching between the auxiliary energy storage module 20 and the main energy storage module 11, and on the other hand, the user only needs to carry the part of the auxiliary energy storage module 20 with the remaining power greater than the preset threshold power to move with the energy storage inverter power supply 10, so as to improve the convenience of the user's carrying.

[0046] Considering that the remaining power of all the auxiliary energy storage modules 20 is less than or equal to the above-mentioned preset threshold power, after the first control module 30 controls the auxiliary energy storage module 20 to switch to the main energy storage module 11 to supply power to the electrical device 3, since the remaining power of the main energy storage module 11 is greater than the remaining power of the auxiliary energy storage module 20, the voltage connected to the input end of the first DC / AC inverter 12 (at this time, the voltage connected to the input end of the first DC / AC inverter 12 is provided by the main energy storage module 11) will suddenly increase sharply. Such a large voltage will form a large inverter current (such as 100V) on the side where the secondary winding of the transformer T is located after passing through the first DC / AC inverter 12 and the transformer T in sequence. Figure 2 As shown, where waveform A is the current in the resonant cavity, and waveform B is the voltage across the main energy storage module 11), such a large inverter current increases the risk of damage to devices such as semiconductor switches in the energy storage inverter 10. And / or, considering that there are multiple auxiliary energy storage modules 20 whose remaining power is greater than the above-mentioned preset threshold power, after the first control module 30 controls one auxiliary energy storage module 20 to switch to another auxiliary energy storage module 20 to supply power to the power-consuming device 3, since the remaining power of the other auxiliary energy storage module 20 is greater than the remaining power of the auxiliary energy storage module 20, the voltage connected to the input end of the first DC / AC inverter 12 (at this time, the voltage connected to the input end of the first DC / AC inverter 12 is provided by the auxiliary energy storage module 20) will also suddenly increase sharply. Such a large voltage will also form a large inverter current on the side where the secondary winding of the transformer T is located after passing through the first DC / AC inverter 12 and the transformer T in sequence. Such a large inverter current also increases the risk of damage to devices such as semiconductor switches in the energy storage inverter 10.

[0047] In order to reduce the inverter current on the side where the secondary winding of the transformer T is located, the energy storage inverter power supply 10 is designed to further include a voltage detection module 40 and a second control module 50. The voltage detection module 40 is connected to the first DC / AC inverter 12 to detect the input voltage of the first DC / AC inverter 12; the second control module 50 is connected to the first DC / AC inverter 12 and the voltage detection module 40.

[0048] Specifically, the specific control method of the inverter current can be but is not limited to the following embodiments.

[0049] In the first embodiment, in the first power supply mode, if the voltage detection module 40 detects that the change in the input voltage of the first DC / AC inverter 12 per unit time is greater than or equal to a preset threshold voltage, the second control module 50 controls the driving duty cycle of the switch tube inside the first DC / AC inverter 12 to be reduced, so as to reduce the inverter current on the side where the secondary winding of the transformer T is located, wherein the reduced driving duty cycle is within a first preset range.

[0050] It should be noted that the value of "unit time" is not limited here, and the designer can reasonably design it according to actual needs. For example, the specific value of "unit time" can be but not limited to 100 milliseconds, 20 milliseconds or 500 milliseconds, etc. The specific value of "threshold voltage" is not limited here, and the designer can reasonably design it according to actual needs. For example, the specific value of "threshold voltage" can be but not limited to 5 volts, 6 volts or 10 volts, etc. The specific value of "first preset range" is not limited here, and the designer can reasonably design it according to actual needs. For example, the specific value of "first preset range" can be but not limited to 10%-15%, 15%-20% or 20%-30%, etc. In the embodiment of the present application, if the voltage detection module 40 detects that the input voltage of the first DC / AC inverter 12 increases by 5 volts every 100 milliseconds, it can be considered that the input voltage will form a large inverter current on the side where the secondary winding of the transformer T is located after passing through the first DC / AC inverter 12 and the transformer T in sequence. The second control module 50 controls the driving duty cycle of the switch tube inside the first DC / AC inverter 12 to decrease by about 10%-50% compared with the previous one.

[0051] In addition, it should be noted that after adjustment, if the voltage detection module 40 detects that the change in the input voltage of the first DC / AC inverter 12 per unit time is less than the above-mentioned preset threshold voltage, the second control module 50 controls the driving duty cycle of the switching tube inside the first DC / AC inverter 12 to gradually return to the driving duty cycle in a stable state.

[0052] In the second embodiment, in the first power supply mode, if the voltage detection module 40 detects that the change in the input voltage of the first DC / AC inverter 12 per unit time is greater than or equal to the threshold voltage, the second control module 50 controls the driving frequency of the switch tube inside the first DC / AC inverter 12 to increase so as to reduce the inverter current on the side where the secondary winding of the transformer T is located, wherein the increased driving frequency is within a second preset range.

[0053] It should be noted that the value of "unit time" is not limited here, and the designer can reasonably design it according to actual needs. For example, the specific value of "unit time" can be but not limited to 100 milliseconds, 20 milliseconds or 500 milliseconds, etc. The specific value of "threshold voltage" is not limited here, and the designer can reasonably design it according to actual needs. For example, the specific value of "threshold voltage" can be but not limited to 5 volts, 6 volts or 10 volts, etc. The specific value of "second preset range" is not limited here, and the designer can reasonably design it according to actual needs. For example, the specific value of "second preset range" can be but not limited to 20 kilohertz, 50 kilohertz, 100 kilohertz, etc. In the embodiment of the present application, if the voltage detection module 40 detects that the input voltage of the first DC / AC inverter 12 increases by 5 volts every 100 milliseconds, it can be considered that the input voltage will form a large inverter current on the side where the secondary winding of the transformer T is located after passing through the first DC / AC inverter 12 and the transformer T in sequence. The second control module 50 controls the driving frequency of the switch tube inside the first DC / AC inverter 12 to increase by about 10%-50% compared with the previous frequency.

[0054] In addition, it should be noted that after adjustment, if the voltage detection module 40 detects that the change in the input voltage of the first DC / AC inverter 12 per unit time is less than the above-mentioned preset threshold voltage, the second control module 50 controls the driving frequency of the switching tube inside the first DC / AC inverter 12 to gradually return to the driving frequency in a stable state.

[0055] In the third embodiment, in the second power supply mode, if the voltage detection module 40 detects that the change in the input voltage of the first DC / AC inverter 12 per unit time is greater than or equal to a preset threshold voltage, the second control module 50 controls the driving duty cycle of the switch tube inside the first DC / AC inverter 12 to be reduced, so as to reduce the inverter current on the side where the secondary winding of the transformer T is located, wherein the reduced driving duty cycle is within a third preset range.

[0056] It should be noted that the value of "unit time" is not limited here, and designers can make reasonable designs according to actual needs. For example, the specific value of "unit time" can be but not limited to 100 milliseconds, 20 milliseconds or 500 milliseconds, etc. The specific value of "threshold voltage" is not limited here, and designers can make reasonable designs according to actual needs. For example, the specific value of "threshold voltage" can be but not limited to 5 volts, 6 volts or 10 volts, etc. The specific value of "third preset range" is not limited here, and designers can make reasonable designs according to actual needs. For example, the specific value of "third preset range" can be but not limited to 10%-15%, 15%-20% or 20%-30%, etc. The specific value of the third preset range can be the same as or different from the specific value of the first preset range. In the embodiment of the present application, if the voltage detection module 40 detects that the input voltage of the first DC / AC inverter 12 increases by 5 volts every 100 milliseconds, it can be considered that the input voltage will form a large inverter current on the side where the secondary winding of the transformer T is located after passing through the first DC / AC inverter 12 and the transformer T in sequence. The second control module 50 controls the driving duty cycle of the switch tube inside the first DC / AC inverter 12 to decrease by about 10%-50% compared with the previous one.

[0057] In addition, it should be noted that after adjustment, if the voltage detection module 40 detects that the change in the input voltage of the first DC / AC inverter 12 per unit time is less than the above-mentioned preset threshold voltage, the second control module 50 controls the driving duty cycle of the switching tube inside the first DC / AC inverter 12 to gradually return to the driving duty cycle in a stable state.

[0058] In the fourth embodiment, in the second power supply mode, if the voltage detection module 40 detects that the change in the input voltage of the first DC / AC inverter 12 per unit time is greater than or equal to the threshold voltage, the second control module 50 controls the driving frequency of the switch tube inside the first DC / AC inverter 12 to increase so as to reduce the inverter current on the side where the secondary winding of the transformer T is located, wherein the increased driving frequency is within a fourth preset range.

[0059] It should be noted that the value of "unit time" is not limited here, and designers can make reasonable designs according to actual needs. For example, the specific value of "unit time" can be but not limited to 100 milliseconds, 20 milliseconds or 500 milliseconds, etc. The specific value of "threshold voltage" is not limited here, and designers can make reasonable designs according to actual needs. For example, the specific value of "threshold voltage" can be but not limited to 5 volts, 6 volts or 10 volts, etc. The specific value of "fourth preset range" is not limited here, and designers can make reasonable designs according to actual needs. For example, the specific value of "fourth preset range" can be but not limited to 20 kHz, 50 kHz, 100 kHz, etc. The specific value of the fourth preset range may be the same as or different from the specific value of the second preset range. In the embodiment of the present application, if the voltage detection module 40 detects that the input voltage of the first DC / AC inverter 12 increases by 5 volts every 100 milliseconds, it can be considered that the input voltage will form a large inverter current on the side where the secondary winding of the transformer T is located after passing through the first DC / AC inverter 12 and the transformer T in sequence. The second control module 50 controls the driving frequency of the switch tube inside the first DC / AC inverter 12 to increase by about 10%-50% compared with the previous frequency.

[0060] In addition, it should be noted that after adjustment, if the voltage detection module 40 detects that the change in the input voltage of the first DC / AC inverter 12 per unit time is less than the above-mentioned preset threshold voltage, the second control module 50 controls the driving frequency of the switching tube inside the first DC / AC inverter 12 to gradually return to the driving frequency in a stable state.

[0061] The following combination Figure 3-Figure 5 In the first power supply mode, the inverter current on the side where the secondary winding of the transformer T is located is reduced by adjusting the driving duty cycle of the switch tubes (including the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4) inside the first DC / AC inverter 12 as an example. Figure 3 As shown, the first DC / AC inverter 12 includes a first switch tube Q1, a second switch tube Q2, a third switch tube Q3 and a fourth switch tube Q4, and the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 are arranged as follows: Figure 3 The first switch tube Q1 and the third switch tube Q3 form one switch tube pair, and the second switch tube Q2 and the fourth switch tube Q4 form another switch tube pair. The second control module 50 controls the switch tube pair formed by the first switch tube Q1 and the third switch tube Q3 and the switch tube pair formed by the second switch tube Q2 and the fourth switch tube Q4 to be turned on alternately, and the driving duty ratio is controlled within the first preset range (such as Figure 4As shown, waveform C is the driving signal of the first switch tube Q1, and waveform D is the voltage across the main energy storage module 11). Obviously, Figure 5 As shown ( Figure 5 The waveform E in the figure is the current in the resonant cavity, and the waveform F is the voltage across the main energy storage module 11). With this design, the maximum value of the inverter current on the side where the secondary winding of the transformer T is located is greatly reduced.

[0062] like Figure 1 As shown, when there are multiple auxiliary energy storage modules 20, there are multiple expansion interfaces 14, and each auxiliary energy storage module 20 is connected to the input end of the first DC / AC inverter 12 via an expansion interface 14. Based on this, considering that if there are multiple auxiliary energy storage modules 20 with remaining power greater than their corresponding preset threshold power, the first control module 30 can arbitrarily control any one of the auxiliary energy storage modules 20 to supply power to the power device 3 separately compared with the remaining auxiliary energy storage modules 20, as long as only one auxiliary energy storage module 20 supplies power to the power device 3 each time. Of course, the first control module 30 can also control all auxiliary energy storage modules 20 to supply power to the power device 3 separately according to the preset discharge rules.

[0063] Specifically, the specific forms of expression of the above-mentioned “preset discharge rule” may include but are not limited to the following embodiments.

[0064] In the first embodiment, the first control module 30 controls all the auxiliary energy storage modules 20 to supply power to the power consumption device 3 in sequence according to the arrangement order of the corresponding expansion interfaces 14. For example, the number of the auxiliary energy storage modules 20 is three, and the three auxiliary energy storage modules 20 are the first auxiliary energy storage module, the second auxiliary energy storage module and the third auxiliary energy storage module; the number of the expansion interfaces 14 is three, and the three expansion interfaces 14 are the first expansion interface, the second expansion interface and the third expansion interface arranged in sequence; assuming that the first auxiliary energy storage module is connected to the input end of the first DC / AC inverter 12 via the first expansion interface, the second auxiliary energy storage module is connected to the input end of the first DC / AC inverter 12 via the second expansion interface, and the third auxiliary energy storage module is connected to the input end of the first DC / AC inverter 12 via the third expansion interface, then the first control module 30 may first control the first auxiliary energy storage module to supply power to the power consumption device 3 alone, then control the second auxiliary energy storage module to supply power to the power consumption device 3 alone, and finally control the third auxiliary energy storage module to supply power to the power consumption device 3 alone.

[0065] In the second embodiment, the first control module 30 controls all the auxiliary energy storage modules 20 to supply power to the power device 3 in the order of the remaining power of each auxiliary energy storage module 20. For example, the number of the auxiliary energy storage modules 20 is three, and the three auxiliary energy storage modules 20 are the first auxiliary energy storage module, the second auxiliary energy storage module and the third auxiliary energy storage module. Assuming that the remaining power of the first auxiliary energy storage module is 90% of the total power, the remaining power of the second auxiliary energy storage module is 70% of the total power, and the remaining power of the third auxiliary energy storage module is 50% of the total power, the first control module 30 may first control the first auxiliary energy storage module to supply power to the power device 3 alone, then control the second auxiliary energy storage module to supply power to the power device 3 alone, and finally control the third auxiliary energy storage module to supply power to the power device 3 alone. In the embodiment of the present application, the first control module 30 first controls the third auxiliary energy storage module to supply power to the power device 3 alone, then controls the second auxiliary energy storage module to supply power to the power device 3 alone, and finally controls the first auxiliary energy storage module to supply power to the power device 3 alone.

[0066] When the energy storage inverter device 1 is in the second power supply mode, any auxiliary energy storage module 20 supplies power to the electrical equipment 3 to a certain intermediate power level (the intermediate power level is less than the power level of the auxiliary energy storage module 20 before discharge but greater than the threshold power level corresponding to the auxiliary energy storage module 20), the first control module 30 controls the other auxiliary energy storage module 20 to supply power to the electrical equipment 3.

[0067] Of course, it can also be that when the multiple expansion interfaces 14 include the first expansion interface and the second expansion interface, the multiple auxiliary energy storage modules 20 include the first auxiliary energy storage module and the second auxiliary energy storage module; the first auxiliary energy storage module is connected to the input end of the first DC / AC inverter 12 via the first expansion interface, and the second auxiliary energy storage module is connected to the input end of the first DC / AC inverter 12 via the second expansion interface; the first controller is configured to switch to the second auxiliary energy storage module to supply power to the power-consuming device 3 when the remaining power of the first auxiliary energy storage module is less than or equal to the preset threshold power. In other words, when there are multiple auxiliary energy storage modules 20 with a remaining power greater than the corresponding preset threshold power, the first control module 30 controls one of the auxiliary energy storage modules 20 to preferentially supply power to the power-consuming device 3 alone, until the remaining power of the one of the auxiliary energy storage modules 20 is less than or equal to the corresponding preset threshold power, the first control module 30 will control another auxiliary energy storage module 20 to continue to supply power to the power-consuming device 3 alone. With such a design, the user only needs to carry part of the auxiliary energy storage modules 20 with a remaining power greater than a preset threshold power to move along with the energy storage inverter 10 , so as to improve the convenience of the user's carrying.

[0068] like Figure 1As shown, considering that when the energy storage inverter device 1 is in the first power supply mode, the first control module 30 can control the auxiliary energy storage module 20 not to supply power to the power-consuming device 3, and when the energy storage inverter device 1 is in the second power supply mode, the first control module 30 can control the auxiliary energy storage module 20 to supply power to the power-consuming device 3, in order to make the auxiliary energy storage module 20 and the first control module 30 have corresponding functions, it is designed that the auxiliary energy storage module 20 includes a first battery cell and a first switch unit, and the first control module 30 includes a first battery cell manager 31. The first switch unit is connected to the input end of the first DC / AC inverter 12; the first battery cell manager 31 is connected to the first battery cell for detecting the power of the first battery cell, and the first battery cell manager 31 is also connected to the first switch unit; in the first power supply mode, the first battery cell manager 31 controls the first switch unit to turn off so that the first battery cell stops supplying power to the power-consuming device 3, and in the second power supply mode, the first battery cell manager 31 controls the first switch unit to turn on so that the first battery cell supplies power to the power-consuming device 3.

[0069] It should be noted that the auxiliary energy storage module 20 also includes a first housing, the first housing has a first accommodating cavity, the first battery cell is arranged in the first accommodating cavity, and the first battery cell manager 31 is also arranged in the first accommodating cavity. The first switch unit has an on state and an off state; in the first power supply mode, the first switch unit is in the off state, and the current of the first battery cell cannot flow to the input end of the first DC / AC inverter 12 through the first switch unit; in the second power supply mode, the first switch unit is in the on state, and the current of the first battery cell can flow to the input end of the first DC / AC inverter 12 through the first switch unit and the expansion interface 14 in sequence. The specific form of the first switch unit is not limited here. The first switch unit includes one or more switch tubes, and the specific form of the switch tube can be a triode or a field effect tube. And it can be understood that when the first switch unit is switched from the off state to the on state, the voltage connected to the input end of the first DC / AC inverter 12 (at this time, the voltage connected to the input end of the first DC / AC inverter 12 is provided by the main energy storage module 11) will suddenly increase sharply.

[0070] Considering that when the energy storage inverter device 1 is in the first power supply mode, the first control module 30 can control the main energy storage module 11 to supply power to the power consumption device 3, and when the energy storage inverter device 1 is in the second power supply mode, the first control module 30 can control the main energy storage module 11 not to supply power to the power consumption device 3, in order to make the main energy storage module 11 and the first control module 30 have corresponding functions, it is designed that the main energy storage module 11 includes a second battery cell and a second switch unit, and the first control module 30 also includes a second battery cell manager 32. The second switch unit is connected to the input end of the first DC / AC inverter 12; the second battery cell manager 32 is connected to the second battery cell for detecting the power of the second battery cell, and the second battery cell manager 32 is also connected to the second switch unit; in the first power supply mode, the second battery cell manager 32 controls the second switch unit to turn on so that the second battery cell supplies power to the power consumption device 3; in the second power supply mode, the second battery cell manager 32 controls the second switch unit to turn off so that the second battery cell stops supplying power to the power consumption device 3.

[0071] It should be noted that the main energy storage module 11 also includes a second shell, the second shell has a second accommodating cavity, the second battery cell is arranged in the second accommodating cavity, and the second battery cell manager 32 is also arranged in the second accommodating cavity. The second switch unit has an on state and an off state; in the first power supply mode, the second switch unit is in the on state, and the current of the second battery cell can flow to the input end of the first DC / AC inverter 12 through the second switch unit and the expansion interface 14 in sequence; in the second power supply mode, the second switch unit is in the off state, and the current of the second battery cell cannot flow to the input end of the first DC / AC inverter 12 through the second switch unit. The specific form of expression of the second switch unit is not limited here. The second switch unit includes one or more switch tubes, and the specific form of expression of the switch tube can be a triode or a field effect tube. And the specific form of expression of the second switch unit can be the same as or different from the specific form of expression of the first switch unit. It can be understood that, after the second switch unit switches from the off state to the on state, the voltage connected to the input end of the first DC / AC inverter 12 (at this time, the voltage connected to the input end of the first DC / AC inverter 12 is provided by the auxiliary energy storage module 20) will suddenly increase sharply.

[0072] In addition, the first control module 30 includes a first battery cell manager 31 and a second battery cell manager 32, and the first battery cell manager 31 is arranged in the first accommodating cavity of the first shell of the auxiliary energy storage module 20, and the second battery cell manager 32 is arranged in the second accommodating cavity of the second shell of the main energy storage module 11; it can be understood that the "first control module 30" here is just a virtual module.

[0073] The second aspect of the present application proposes an energy storage inverter system (not shown in the figure), which includes an electric device 3 and the above-mentioned energy storage inverter device 1, and the electric device 3 is connected to the output interface 13. In this design, the energy storage inverter system with the above-mentioned energy storage inverter device 1 has a larger overall battery capacity of the inverter energy storage device and can be applied to more application scenarios; the switching between the auxiliary energy storage module 20 and the main energy storage module 11 realizes the uninterrupted power supply of the energy storage inverter device 1 to the electric device 3; the user only needs to carry the part of the auxiliary energy storage module 20 with a remaining power greater than the preset threshold power to move with the energy storage inverter power supply 10 to improve the convenience of the user's carrying.

[0074] It should be noted that the energy storage inverter system can be an ordinary energy storage inverter system or a photovoltaic energy storage inverter system. When the energy storage inverter system is a photovoltaic energy storage inverter system, the photovoltaic energy storage inverter system also includes a photovoltaic module, and the output end of the photovoltaic module is connected to the input interface of the energy storage inverter power supply 10. The photovoltaic module is used to absorb solar energy from the sun, and convert the solar energy into direct current and output it to the energy storage inverter power supply 10. The output interface 13 of the energy storage inverter power supply 10 is used to connect the electrical equipment 3 to convert the direct current output by the photovoltaic module into alternating current and output it to the electrical equipment 3. Among them, "electrical equipment 3" can be understood as equipment that consumes electrical energy when working. For example, the electrical equipment 3 can be but is not limited to household appliances such as refrigerators, air conditioners, and water heaters. The number of input interfaces of the energy storage inverter 10 can be one or more; when the number of input interfaces of the energy storage inverter 10 is one, the energy storage inverter 10 is connected to one photovoltaic component; when the number of input interfaces of the energy storage inverter 10 is more than one, the energy storage inverter 10 can be connected to multiple photovoltaic components at the same time.

[0075] In the photovoltaic energy storage inverter system, the photovoltaic components, the energy storage inverter device 1 and the power equipment 3 are independent components. The user can move and assemble the photovoltaic components, the energy storage inverter device 1 and the power equipment 3 accordingly according to the actual application environment to meet the user's power demand in different application scenarios. For example, in a cloudy application environment, the user can only assemble the power equipment 3 with the energy storage inverter device 1 to realize the power supply demand of the energy storage inverter device 1 to the power equipment 3. For another example, in a sunny application environment, the user can only assemble the photovoltaic components with the energy storage inverter device 1 to realize the power supply demand of the photovoltaic components to the energy storage inverter device 1.

[0076] Please refer to Figure 6As shown, the third aspect of the present application proposes a control method for an energy storage inverter device 1, the energy storage inverter device 1 includes at least one auxiliary energy storage module 20, and each step in the control method can be executed by the energy storage inverter device 1, for example, can be implemented by the first control module 30 and / or the second control module 50 in the energy storage inverter device 1. Figure 6 As shown, Figure 6 FIG. 1 is a flow chart of a control method of an energy storage inverter device 1 in an embodiment of the present application. Figure 6 As shown, the control method of the energy storage inverter device 1 includes step S201, step S202 and step S203.

[0077] Step S201: Compare the remaining power of each secondary energy storage module 20 with the corresponding preset threshold power.

[0078] In step S201, a first control module 30 may be provided, and the first control module 30 may monitor the remaining power of the auxiliary energy storage module 20 in real time, and the first control module 30 may be used to compare the remaining power of the auxiliary energy storage module 20 with a preset threshold power. It should be noted that the specific meaning of the "preset threshold power" is not limited here, for example, the "preset threshold power" may be understood as the minimum power of the auxiliary energy storage module 20 that can supply the electrical equipment 3 with work (such as working at 20% of the rated power), and the "preset threshold power" may also be understood as the minimum power of the auxiliary energy storage module 20 that can supply the electrical equipment 3 with normal work (such as working at the rated power).

[0079] Step S202 : if the remaining power of each secondary energy storage module 20 is less than or equal to a preset threshold power, the primary energy storage module 11 is controlled to supply power to the power-consuming device 3 alone.

[0080] In step S202, when the remaining power of each auxiliary energy storage module 20 is less than or equal to the preset threshold power, the energy storage inverter device 1 is in the first power supply mode. In the first power supply mode, the first control module 30 controls the main energy storage module 11 to supply power to the electrical equipment 3 alone.

[0081] Step S203 : if the remaining power of at least one secondary energy storage module 20 is greater than its corresponding preset threshold power, control one of the one or more secondary energy storage modules 20 to supply power to the power-consuming device 3 alone.

[0082] In step S203, when the remaining power of at least one auxiliary energy storage module 20 is greater than the corresponding preset threshold power, the energy storage inverter device 1 is in the second power supply mode, and in the second power supply mode, the first control module 30 controls a currently determined auxiliary energy storage module 20 to supply power to the power-consuming device 3 alone. It should be noted that as long as there is an auxiliary energy storage module 20 with a remaining power greater than the preset threshold power, the first control module 30 will control the auxiliary energy storage module 20 to supply power to the power-consuming device 3 in priority compared with the main energy storage module 11, until the remaining power of all auxiliary energy storage modules 20 is less than or equal to the above-mentioned preset threshold power, the first control module 30 will control all auxiliary energy storage modules 20 to stop supplying power to the power-consuming device 3, and as long as the power-consuming device 3 still has power demand, the first control module 30 will control the main energy storage module 11 to continue to supply power to the power-consuming device 3 alone.

[0083] Based on the control method of the inverter energy storage device in the embodiment of the present application, by designing the auxiliary energy storage module 20, the auxiliary energy storage module 20 can supply power to the power-consuming device 3 through the expansion interface 14, so that the overall battery capacity of the inverter energy storage device is larger and can be applied to more application scenarios. By designing at least one auxiliary energy storage module 20, the remaining power of the auxiliary energy storage module 20 is compared with the preset threshold power, and when the remaining power of at least one auxiliary energy storage module 20 is greater than the preset threshold power, a currently determined auxiliary energy storage module 20 among one or more auxiliary energy storage modules 20 is controlled to supply power to the power consumption device 3 alone, so that the energy storage inverter device 1 is in the second working mode in which the auxiliary energy storage module 20 has priority over the main energy storage module 11 to supply power to the power consumption device 3 alone, and until the remaining power of all the auxiliary energy storage modules 20 is less than or equal to the corresponding preset threshold power, the main energy storage module 11 will be controlled to supply power to the power consumption device 3 alone, so that the energy storage inverter device 1 is in the first working mode. Such a design, on the one hand, realizes the uninterrupted power supply of the energy storage inverter device 1 to the power consumption device 3 through the switching between the auxiliary energy storage module 20 and the main energy storage module 11, and on the other hand, the user only needs to carry the part of the auxiliary energy storage module 20 with the remaining power greater than the preset threshold power to move with the energy storage inverter power supply 10, so as to improve the convenience of the user's carrying.

[0084] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or position relationship based on the orientation or position relationship shown in the drawings, it is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0085] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An energy storage inverter device, characterized in that: include: An energy storage inverter power supply, comprising a main energy storage module, a first DC / AC inverter, a transformer, an AC / DC rectifier, a second DC / AC inverter, at least one output interface and at least one expansion interface, wherein the output end of the main energy storage module is connected to the input end of the first DC / AC inverter, the output end of the first DC / AC inverter is connected to the primary winding of the transformer, the secondary winding of the transformer is connected to the input end of the AC / DC rectifier, the output end of the AC / DC rectifier is connected to the input end of the second DC / AC inverter, the output end of the second DC / AC inverter is connected to the at least one output interface, and the output interface is used to access an electrical device; One or more auxiliary energy storage modules are respectively connected to the input end of the first DC / AC inverter via the corresponding expansion interface; A first control module is connected to the main energy storage module and the auxiliary energy storage module, and is used to compare the remaining power of the one or more auxiliary energy storage modules with the corresponding preset threshold power; when the remaining power of each auxiliary energy storage module is less than or equal to the preset threshold power, the energy storage inverter device is in a first power supply mode, in which the first control module controls the main energy storage module to supply power to the power-consuming device alone; when the remaining power of at least one auxiliary energy storage module is greater than the corresponding preset threshold power, the energy storage inverter device is in a second power supply mode, in which the first control module controls one of the one or more auxiliary energy storage modules to supply power to the power-consuming device alone.

2. The energy storage inverter device according to claim 1, characterized in that: The energy storage inverter power supply further includes a voltage detection module and a second control module, wherein the voltage detection module is connected to the first DC / AC inverter to detect the input voltage of the first DC / AC inverter, and the second control module is connected to the first DC / AC inverter and the voltage detection module; Wherein, in the first power supply mode, if the voltage detection module detects that the change of the input voltage per unit time is greater than or equal to a preset threshold voltage, the second control module controls the driving duty cycle of the switch tube inside the first DC / AC inverter to be reduced, so as to reduce the inverter current on the side where the secondary winding of the transformer is located, wherein the reduced driving duty cycle is within a first preset range; or In the first power supply mode, if the voltage detection module detects that the change in the input voltage per unit time is greater than or equal to the threshold voltage, the second control module controls the driving frequency of the switching tube inside the first DC / AC inverter to increase so as to reduce the inverter current on the side where the secondary winding of the transformer is located, wherein the increased driving frequency is within a second preset range.

3. The energy storage inverter device according to claim 1, characterized in that: There are multiple expansion interfaces, there are multiple auxiliary energy storage modules, and each auxiliary energy storage module is connected to the input end of the first DC / AC inverter via one expansion interface, and the first control module controls all the auxiliary energy storage modules to supply power to the electrical equipment separately according to preset discharge rules.

4. The energy storage inverter device according to claim 3, characterized in that: The plurality of expansion interfaces at least include a first expansion interface and a second expansion interface, the plurality of auxiliary energy storage modules at least include a first auxiliary energy storage module and a second auxiliary energy storage module, the first auxiliary energy storage module is connected to the input end of the first DC / AC inverter via the first expansion interface, and the second auxiliary energy storage module is connected to the input end of the first DC / AC inverter via the second expansion interface; Wherein, in the second power supply mode, the first control module is configured to switch to the second auxiliary energy storage module to supply power to the electrical device when the remaining power of the first auxiliary energy storage module is less than or equal to the preset threshold power.

5. The energy storage inverter device according to claim 1, characterized in that: The energy storage inverter power supply further includes a voltage detection module and a second control module, wherein the voltage detection module is connected to the first DC / AC inverter to detect the input voltage of the first DC / AC inverter, and the second control module is connected to the first DC / AC inverter and the voltage detection module; Wherein, in the second power supply mode, if the voltage detection module detects that the change of the input voltage per unit time is greater than or equal to a preset threshold voltage, the second control module controls the driving duty cycle of the switch tube inside the first DC / AC inverter to be reduced, so as to reduce the inverter current on the side where the secondary winding of the transformer is located, wherein the reduced driving duty cycle is within a third preset range; or In the second power supply mode, if the voltage detection module detects that the change in the input voltage per unit time is greater than or equal to the threshold voltage, the second control module controls the driving frequency of the switching tube inside the first DC / AC inverter to increase so as to reduce the inverter current on the side where the secondary winding of the transformer is located, wherein the increased driving frequency is within a fourth preset range.

6. The energy storage inverter device according to claim 1, characterized in that: Each of the auxiliary energy storage modules is configured to be detachably connected to any of the expansion interfaces.

7. The energy storage inverter device according to any one of claims 1 to 6, characterized in that: The auxiliary energy storage module includes a first switch unit and a first battery cell, and the first switch unit is connected to the input end of the first DC / AC inverter; The first control module includes a first battery cell manager, which is connected to the first battery cell to detect the power level of the first battery cell; Among them, the first battery cell manager is also connected to the first switch unit; in the first power supply mode, the first battery cell manager controls the first switch unit to turn off so that the first battery cell stops supplying power to the electrical device; in the second power supply mode, the first battery cell manager controls the first switch unit to turn on so that the first battery cell supplies power to the electrical device.

8. The energy storage inverter device according to claim 7, characterized in that: The main energy storage module includes a second battery cell and a second switch unit, and the second switch unit is connected to the input end of the first DC / AC inverter; The first control module further includes a second battery cell manager, which is connected to the second battery cell to detect the power level of the second battery cell; Among them, the second battery cell manager is also electrically connected to the second switch unit; in the first power supply mode, the second battery cell manager controls the second switch element to turn on so that the second battery cell supplies power to the electrical device; in the second power supply mode, the second battery cell manager controls the second switch unit to turn off so that the second battery cell stops supplying power to the electrical device.

9. An energy storage inverter system, characterized in that: include: The energy storage inverter device according to any one of claims 1 to 8; and At least one electrical device, each of which is connected to a corresponding output interface.

10. A control method for an energy storage inverter device, characterized in that: The energy storage inverter device is an energy storage inverter device as described in any one of claims 1 to 8; the control method comprises: Comparing the remaining power of each of the auxiliary energy storage modules with the corresponding preset threshold power; If the remaining power of each of the auxiliary energy storage modules is less than or equal to the corresponding preset threshold power, controlling the main energy storage module to supply power to the power supply device alone; If the remaining power of at least one of the secondary energy storage modules is greater than the corresponding preset threshold power, one of the one or more secondary energy storage modules is controlled to supply power to the electrical device alone.

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