Wide-voltage bidirectional inverter system

Abstract

The invention discloses a wide-voltage bidirectional inversion system which comprises an energy storage battery, a Boost-Buck converter module, a photovoltaic interface, a first driving module, a second driving module, a main control module, a control module, a bidirectional battery charging and discharging module, a bidirectional rectification inversion module, a load output module and a commercial power input module. And the main control module is used for receiving an external working mode signal to determine to execute a first working mode, a second working mode, a third working mode or a fourth working mode. According to the invention, the energy storage battery, the Boost-Buck converter module, the photovoltaic interface, the first driving module, the second driving module, the main control module, the control module, the bidirectional battery charging and discharging module, the bidirectional rectification inversion module, the load output module and the commercial power input module are arranged, and the main control module is used for reasonably controlling each module, so that multiple working modes are realized; therefore, the application scene of the system is widened, and the scene applicability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of inverters, and in particular to a wide voltage bidirectional inverter system. Background Art

[0002] At present, the common energy storage inverter system in the market is mainly composed of photovoltaic modules PV, MPPT controller, bidirectional AC / DC rectifier inverter circuit, energy storage battery, etc. Among them, the three subsystems of MPPT controller, bidirectional battery charging and discharging circuit and bidirectional rectifier inverter circuit are connected by a common DC bus, and the Boost converter topology is used as the main circuit of the MPPT controller. The output voltage is high and there are safety hazards. Moreover, the working mode of the entire photovoltaic energy storage inverter system is single and the application scenario is single. Therefore, how to improve the richness of the energy storage inverter system is a technical problem that needs to be studied urgently in the industry. Summary of the invention

[0003] The present invention provides a wide voltage bidirectional inverter system to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0004] The present invention provides a wide voltage bidirectional inverter system, comprising: an energy storage battery, a Boost-Buck converter module, a photovoltaic interface, a first drive module, a second drive module, a main control module, a control module, a bidirectional battery charge and discharge module, a bidirectional rectifier inverter module, a load output module and a mains input module; The Boost-Buck converter module is connected to the first input and output end of the bidirectional battery charge and discharge module; the photovoltaic interface is arranged between the Boost-Buck converter module and the first input and output end of the bidirectional battery charge and discharge module, and the photovoltaic interface is used to connect to an external photovoltaic array; The second input and output end of the bidirectional battery charging and discharging module is connected to the first input and output end of the bidirectional rectifier inverter module, and the second input and output end of the bidirectional rectifier inverter module is respectively connected to the load output module and the mains input module; the output end of the second driving module is connected to the control end of the bidirectional battery charging and discharging module, the first acquisition end of the control module is connected to the bidirectional rectifier inverter module, and the second acquisition end of the control module is connected to the mains input module; the output end of the control module is connected to the input end of the second driving module; The output end of the first driving module is connected to the input end of the Boost-Buck converter module; the first output end of the main control module is connected to the input end of the first driving module, the second output end of the main control module is connected to the control end of the load input module, and the third output end of the main control module is connected to the control end of the main power input module; The load output module is used to connect to an external load, and the mains input module is used to connect to an external AC power source; The main control module is used to control the load output module to connect to an external load, and the main control module is used to control the mains input module to connect to an external alternating current; the main control module is used to receive an external working mode signal to determine whether to execute the first working mode, the second working mode, the third working mode or the fourth working mode; Among them, in the first working mode, the external AC power and the energy storage battery simultaneously power the external load; in the second working mode, the energy storage battery independently powers the external load; in the third working mode, the external AC power charges the energy storage battery; in the fourth working mode, the external photovoltaic array charges the energy storage battery.

[0005] Further, in the first working mode, the main control module controls the load output module to access the external load, and the main control module controls the mains input module to access the external alternating current; The main control module controls the first driving module to drive the Boost-Buck converter module, so that the energy storage battery outputs a first current and a first voltage to the load output module, and the first current and the first voltage pass through the bidirectional battery charging and discharging module and the bidirectional rectifying and inverter module in sequence; the control module determines the first frequency characteristic of the loop according to the first current and the first voltage passing through the bidirectional rectifying and inverter module; The control module determines a second frequency characteristic according to a second current and a second voltage of the external alternating current input; uses the second frequency characteristic as compensation for the first frequency characteristic to determine a target frequency characteristic; A PWM signal is output according to the target frequency characteristic to control the second driving module, thereby adjusting the bidirectional battery charging and discharging module to adjust the first current and the first voltage flowing through the bidirectional battery charging and discharging module, so that the target frequency characteristic meets the set requirements.

[0006] Further, in the second working mode, the main control module controls the load output module to connect to the external load, and the main control module controls the mains input module not to connect to the external AC power; The main control module controls the first driving module to drive the Boost-Buck converter module, so that the energy storage battery outputs a first current and a first voltage to the load output module, and the first current and the first voltage pass through the bidirectional battery charging and discharging module and the bidirectional rectifying and inverter module in sequence; The control module determines the frequency characteristics of the loop according to the first current and the first voltage passing through the bidirectional rectifier inverter module; and uses the frequency characteristics as the target frequency characteristics; A PWM signal is output according to the target frequency characteristic to control the second driving module, thereby adjusting the bidirectional battery charging and discharging module to adjust the first current and the first voltage flowing through the bidirectional battery charging and discharging module, so that the target frequency characteristic meets the set requirements.

[0007] Further, in the third working mode, the main control module controls the load output module not to be connected to the external load, and the main control module controls the mains input module to be connected to the external alternating current; The main control module controls the first driving module to drive the Boost-Buck converter module, so that the external alternating current outputs a second current and a second voltage toward the energy storage battery; The second current and the second voltage pass through the bidirectional rectifying and inverting module and the bidirectional battery charging and discharging module in sequence; the control module determines the frequency characteristics of the loop according to the second current and the second voltage passing through the bidirectional rectifying and inverting module; and uses the frequency characteristics as the target frequency characteristics; A PWM signal is output according to the target frequency characteristic to control the second driving module, thereby adjusting the bidirectional battery charging and discharging module to adjust the second current and the second voltage flowing through the bidirectional battery charging and discharging module, so that the target frequency characteristic meets the set requirements.

[0008] Further, in a fourth working mode, the main control module controls the load output module not to be connected to an external load, and the main control module controls the mains input module not to be connected to an external alternating current; The main control module controls the first driving module to drive the Boost-Buck converter module, so that the external photovoltaic array outputs a third current and a third voltage toward the energy storage battery.

[0009] Further, the control module includes: a PLL power calculation module, a PLL module, a voltage and current dual-loop control module, an adaptive module and a VSG algorithm module; In the first working mode, the PLL power calculation module obtains the first current and the first voltage passing through the bidirectional rectifier inverter module, and calculates the first power and the first power factor of the loop according to the first current and the first voltage; the adaptive module is pre-set with optimization parameters; The VSG algorithm module is used to obtain the frequency characteristics of the current loop through a virtual synchronous generator algorithm according to the first power, the first power factor and the optimization parameter, and record the frequency characteristics as the first frequency characteristics; The PLL module obtains a second current and a second voltage of the external alternating current through the mains input module, determines a frequency characteristic of the external alternating current according to the first current and the second voltage, and records the frequency characteristic as a second frequency characteristic.

[0010] Further, the control module includes: a PLL power calculation module, a PLL module, a voltage and current dual-loop control module, an adaptive module and a VSG algorithm module; In the second working mode, the PLL power calculation module obtains the first current and the first voltage passing through the bidirectional rectifier inverter module, and calculates the power and the power factor of the loop according to the first current and the first voltage; the adaptive module is pre-set with optimization parameters; The VSG algorithm module is used to obtain the frequency characteristics of the current loop through a virtual synchronous generator algorithm according to the power, power factor and optimization parameters; and use the frequency characteristics as the target frequency characteristics.

[0011] Further, the control module includes: a PLL power calculation module, a PLL module, a voltage and current dual-loop control module, an adaptive module and a VSG algorithm module; In the third working mode, the PLL power calculation module obtains the second current and the second voltage passing through the bidirectional rectifier inverter module, and calculates the second power and the second power factor of the loop according to the second current and the second voltage; the adaptive module is pre-set with optimization parameters; The VSG algorithm module is used to obtain the frequency characteristics of the current loop through a virtual synchronous generator algorithm according to the second power, the second power factor and the optimization parameters, and use the frequency characteristics as the target frequency characteristics.

[0012] Furthermore, the energy storage battery is a lithium battery.

[0013] Furthermore, the wide voltage bidirectional inverter system further includes a wireless module, which is connected to the main control module. The wireless module is used to receive an external working mode signal and transmit the working mode signal to the main control module.

[0014] The present invention has at least the following beneficial effects: the present invention is provided with an energy storage battery, a Boost-Buck converter module, a photovoltaic interface, a first drive module, a second drive module, a main control module, a control module, a bidirectional battery charge and discharge module, a bidirectional rectifier inverter module, a load output module and a mains input module. The main control module is used to reasonably control each module, thereby realizing multiple working modes, thereby broadening the application scenarios of the system and improving the scenario applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0016] Figure 1It is a schematic diagram of the system structure of a wide voltage bidirectional inverter system; Figure 2 It is a schematic diagram of the module structure of the control module; Figure 3 It is a schematic diagram of the interface structure of the main control human-computer interaction interface. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention 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 invention and are not used to limit the present invention.

[0018] It should be noted that, although the functional modules are divided in the system schematic diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the system or the order in the flowchart. The terms "first", "second", etc. in the specification, claims and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0019] In order to facilitate a clearer understanding of the technical solution of the present application, some necessary technical terms are explained below.

[0020] Energy storage battery, energy storage battery is a device that can convert electrical energy into chemical energy (or physical energy, kinetic energy) and store it, and then release the stored energy into electrical energy when needed.

[0021] Boost-Buck converter module, Boost-Buck converter module refers to a power electronic converter module with both boost (Boost) and buck (Buck) functions.

[0022] A trigger control is a user interface element that can trigger preset operations or events when the user interacts with the interface (such as clicking, inputting, selecting, etc.) or when specific conditions are met (such as time arrival, data change, etc.).

[0023] Intelligent device, an intelligent device refers to any device, instrument or machine with computing processing capabilities.

[0024] PLL, PLL (Phase-Locked Loop) is a closed-loop feedback control system used for frequency synthesis and phase control in electronic engineering. The core of PLL is a negative feedback control system that can keep the phase of the output signal consistent with the phase of the input reference signal, or make the frequency of the output signal have a fixed proportional relationship with the frequency of the input signal.

[0025] VSG (Virtual Synchronous Generator) algorithm is a technology that embeds the mathematical model of a synchronous generator into the control algorithm of an inverter, allowing a stationary power electronic device to simulate the operation of a rotating motor.

[0026] PWM, PWM (Pulse Width Modulation) is an analog control technology that controls the output by changing the duty cycle of the pulse signal (that is, the ratio of pulse width to pulse period).

[0027] Please refer to Figure 1 and Figure 2 , Figure 1 It is a system structure diagram of a wide voltage bidirectional inverter system. Figure 2 It is a schematic diagram of the module structure of the control module.

[0028] The present application mainly designs an inverter system, which has rich working modes and can cope with various application scenarios.

[0029] To achieve this goal, the present application provides a wide voltage bidirectional inverter system, including: an energy storage battery, a Boost-Buck converter module, a photovoltaic interface, a first drive module, a second drive module, a main control module, a control module, a bidirectional battery charging and discharging module, a bidirectional rectifier inverter module, a load output module and a mains input module.

[0030] Among them, the Boost-Buck converter module is connected to the first input and output end of the bidirectional battery charge and discharge module; the photovoltaic interface is arranged between the Boost-Buck converter module and the first input and output end of the bidirectional battery charge and discharge module, and the photovoltaic interface is used to connect to an external photovoltaic array.

[0031] The second input and output end of the bidirectional battery charging and discharging module is connected to the first input and output end of the bidirectional rectifying and inverter module, and the second input and output end of the bidirectional rectifying and inverter module is respectively connected to the load output module and the mains input module.

[0032] The output end of the second driving module is connected to the control end of the bidirectional battery charging and discharging module, the first collection end of the control module is connected to the bidirectional rectification and inverter module, and the second collection end of the control module is connected to the mains input module; the output end of the control module is connected to the input end of the second driving module.

[0033] The output end of the first driving module is connected to the input end of the Boost-Buck converter module; the first output end of the main control module is connected to the input end of the first driving module, the second output end of the main control module is connected to the control end of the load input module, and the third output end of the main control module is connected to the control end of the AC input module.

[0034] The load output module is used to connect to an external load, and the mains input module is used to connect to an external AC power supply; the main control module is used to control the load output module to connect to an external load, and the main control module is used to control the mains input module to connect to an external AC power.

[0035] The main control module is used to receive an external working mode signal to determine the execution of the first working mode, the second working mode, the third working mode or the fourth working mode; wherein, in the first working mode, the external alternating current and the energy storage battery simultaneously power the external load; in the second working mode, the energy storage battery independently powers the external load; in the third working mode, the external alternating current charges the energy storage battery; in the fourth working mode, the external photovoltaic array charges the energy storage battery.

[0036] The main control module is connected to the bidirectional battery charging and discharging module.

[0037] The bidirectional battery charge and discharge module has charging and discharging functions, that is, the bidirectional battery charge and discharge module can be controlled by the main control module so that the current passing through it enters from the first input and output end of the bidirectional battery charge and discharge module and flows out from the second input and output end of the bidirectional battery charge and discharge module. The bidirectional battery charge and discharge module can also be controlled by the main control module so that the current enters from the second input and output end of the bidirectional battery charge and discharge module and flows out from the first input and output end of the bidirectional battery charge and discharge module.

[0038] The main control module is connected to the bidirectional rectification and inverter module.

[0039] The bidirectional rectifier inverter module has a bidirectional current rectifier inverter function, that is, the bidirectional current rectifier inverter module can be controlled by the main control module, so that the current passing through it enters from the first input and output end of the bidirectional rectifier inverter module and flows out from the second input and output end of the bidirectional ballast inverter module. The bidirectional rectifier inverter module can also be controlled by the main control module, so that the current enters from the second input and output end of the bidirectional rectifier inverter module and flows out from the first input and output end of the bidirectional rectifier inverter module.

[0040] The main control module is configured with four working modes, namely: a first working mode, a second working mode, a third working mode and a fourth working mode.

[0041] The first working mode is mainly for application scenarios where external AC power and energy storage batteries simultaneously power the load.

[0042] At this time, the main control module will control the AC input module and the load output module, so that the load output module is connected to the external load and the AC input module is connected to the external AC power.

[0043] The main control module calls the control program of the first working mode configured by it. Thus, the main control module controls the first driving module to drive the Boost-Buck converter module, so that the energy storage battery outputs the first current and the first voltage to the load output module, and the first current and the first voltage pass through the bidirectional battery charging and discharging module and the bidirectional rectifier inverter module in sequence; the control module determines the first frequency characteristic of the loop according to the first current and the first voltage passing through the bidirectional rectifier inverter module; The control module determines a second frequency characteristic according to a second current and a second voltage of the external alternating current input; Using the second frequency characteristic as compensation for the first frequency characteristic, determining a target frequency characteristic; A PWM signal is output according to the target frequency characteristic to control the second driving module, thereby adjusting the bidirectional battery charging and discharging module to adjust the first current and the first voltage flowing through the bidirectional battery charging and discharging module, so that the target frequency characteristic meets the set requirements.

[0044] The control module includes: a PLL power calculation module, a PLL module, a voltage and current dual-loop control module, an adaptive module and a VSG algorithm module.

[0045] In the first working mode, the PLL power calculation module obtains the first current and the first voltage passing through the bidirectional rectifier inverter module, and calculates the first power and the first power factor of the loop according to the first current and the first voltage; the adaptive module is pre-set with optimization parameters; the VSG algorithm module is used to obtain the frequency characteristics of the current loop through the virtual synchronous generator algorithm according to the first power, the first power factor and the optimization parameters, and record the frequency characteristics as the first frequency characteristics. The PLL module obtains the second current and the second voltage of the external alternating current connected through the mains input module, determines the frequency characteristics of the external alternating current according to the first current and the second voltage, and records the frequency characteristics as the second frequency characteristics.

[0046] The second working mode is mainly for application scenarios where the energy storage battery independently supplies power to external loads.

[0047] At this time, the main control module will control the AC input module and the load output module, so that the load output module is connected to the external load, and the AC input module is not connected to the external AC power.

[0048] The main control module calls the control program of the second working mode configured by it, so that the main control module controls the first driving module to drive the Boost-Buck converter module, so that the energy storage battery outputs the first current and the first voltage to the load output module, and the first current and the first voltage pass through the bidirectional battery charging and discharging module and the bidirectional rectifying and inverter module in sequence; The control module determines the frequency characteristics of the loop according to the first current and the first voltage passing through the bidirectional rectifier inverter module; and uses the frequency characteristics as the target frequency characteristics; A PWM signal is output according to the target frequency characteristic to control the second driving module, thereby adjusting the bidirectional battery charging and discharging module to adjust the first current and the first voltage flowing through the bidirectional battery charging and discharging module, so that the target frequency characteristic meets the set requirements.

[0049] The control module includes: a PLL power calculation module, a PLL module, a voltage-current dual-loop control module, an adaptive module and a VSG algorithm module. In the second working mode, the PLL power calculation module obtains the first current and the first voltage passing through the bidirectional rectifier inverter module, and calculates the power and power factor of the loop according to the first current and the first voltage; the adaptive module is pre-set with optimization parameters; the VSG algorithm module is used to obtain the frequency characteristics of the current loop through the virtual synchronous generator algorithm according to the power, power factor and optimization parameters; and the frequency characteristics are used as the target frequency characteristics.

[0050] The third working mode is mainly for the application scenario of charging the energy storage battery with external AC power.

[0051] At this time, the main control module will control the AC input module and the load output module, so that the load output module is not connected to the external load, and the AC input module is connected to the external AC power.

[0052] The main control module calls the control program of the third working mode configured therein, thereby enabling the main control module to control the first driving module to drive the Boost-Buck converter module, so that the external alternating current outputs the second current and the second voltage toward the energy storage battery; The second current and the second voltage pass through the bidirectional rectifying and inverting module and the bidirectional battery charging and discharging module in sequence; The control module determines the frequency characteristics of the loop according to the second current and the second voltage passing through the bidirectional rectifier inverter module; and uses the frequency characteristics as the target frequency characteristics; A PWM signal is output according to the target frequency characteristic to control the second driving module, thereby adjusting the bidirectional battery charging and discharging module to adjust the second current and the second voltage flowing through the bidirectional battery charging and discharging module, so that the target frequency characteristic meets the set requirements.

[0053] The control module includes: a PLL power calculation module, a PLL module, a voltage and current dual-loop control module, an adaptive module and a VSG algorithm module.

[0054] In the third working mode, the PLL power calculation module obtains the second current and the second voltage passing through the bidirectional rectifier inverter module, and calculates the second power and the second power factor of the loop according to the second current and the second voltage; the adaptive module is pre-set with optimization parameters; the VSG algorithm module is used to obtain the frequency characteristics of the current loop through the virtual synchronous generator algorithm according to the second power, the second power factor and the optimization parameters, and use the frequency characteristics as the target frequency characteristics.

[0055] The fourth working mode is mainly for application scenarios where an external photovoltaic array provides independent power supply to the energy storage battery.

[0056] At this time, the main control module will control the AC input module and the load output module, so that the load output module is not connected to the external load and the AC input module is not connected to the external AC power.

[0057] The main control module calls the control program of the fourth working mode configured by the main control module, so that the main control module controls the first driving module to drive the Boost-Buck converter module, so that the external photovoltaic array outputs the third current and the third voltage in the direction of the energy storage battery.

[0058] In some further specific embodiments, the energy storage battery is a lithium battery.

[0059] In order to enable the main control module to better obtain the external working mode signal, the wide voltage bidirectional inverter system further includes a wireless module. The wireless module is connected to the main control module and is used to receive the external working mode signal and transmit the working mode signal to the main control module.

[0060] The present invention arranges an energy storage battery, a Boost-Buck converter module, a photovoltaic interface, a first drive module, a second drive module, a main control module, a control module, a bidirectional battery charge and discharge module, a bidirectional rectifier inverter module, a load output module and a mains input module, and uses the main control module to reasonably control each module, thereby realizing multiple working modes, thereby broadening the application scenarios of the system and improving the scenario applicability.

[0061] refer to Figure 3 , Figure 3 It is a schematic diagram of the interface structure of the main control human-computer interaction interface.

[0062] In some further specific embodiments, the wide voltage bidirectional inverter system further includes an intelligent device, and the intelligent device is connected to the wireless module.

[0063] The smart device is provided with a main control human-computer interaction interface 100 , and the main control human-computer interaction interface 100 is provided with a first mode trigger control 101 , a second mode trigger control 102 , a third mode trigger control 103 , a fourth mode trigger control 104 and a display control 110 .

[0064] The smart device acquires in real time the position coordinates of the trigger event of the user on the main control human-computer interaction interface 100. According to the position coordinates, it is determined which mode trigger control is triggered by the user.

[0065] Specifically, when the position coordinates belong to the position coordinate set of the sensing area of ​​the first mode trigger control 101, it is considered that the user has triggered the first mode trigger control 101. When the position coordinates belong to the position coordinate set of the sensing area of ​​the second mode trigger control 102, it is considered that the user has triggered the second mode trigger control 102. When the position coordinates belong to the position coordinate set of the sensing area of ​​the third mode trigger control 103, it is considered that the user has triggered the third mode trigger control 103. When the position coordinates belong to the position coordinate set of the sensing area of ​​the fourth mode trigger control 104, it is considered that the user has triggered the fourth mode trigger control 104.

[0066] When the smart device determines that the first mode trigger control 101 is triggered, it will communicate with the wireless module and transmit a preset signal indicating the first working mode to the wireless module, so that the wireless module can transmit the signal of the first working mode to the main control module, thereby informing the main control module that the first working mode needs to be executed.

[0067] When the smart device determines that the second mode trigger control 102 is triggered, it will communicate with the wireless module and transmit a preset signal indicating the second working mode to the wireless module, so that the wireless module can transmit the signal of the second working mode to the main control module, thereby informing the main control module that the second working mode needs to be executed.

[0068] When the smart device determines that the third mode trigger control 103 is triggered, it will communicate with the wireless module and transmit a preset signal indicating the third working mode to the wireless module, so that the wireless module can transmit the signal of the third working mode to the main control module, thereby informing the main control module that the third working mode needs to be executed.

[0069] When the smart device determines that the fourth mode trigger control 104 is triggered, it will communicate with the wireless module and transmit a preset signal indicating the fourth working mode to the wireless module, so that the wireless module can transmit the signal of the fourth working mode to the main control module, thereby informing the main control module that the fourth working mode needs to be executed.

[0070] When the main control module determines to execute the first working mode, the main control module transmits the first mark information to the smart device through the wireless module, and after the smart device receives the first mark information, the display control 110 displays the set first UI element in the main control human-computer interaction interface 100 to inform the user that the current main control module executes the first working mode.

[0071] When the main control module determines to execute the second working mode, the main control module transmits the second flag information to the smart device through the wireless module, and after the smart device receives the second flag information, the display control 110 displays the set second UI element in the main control human-computer interaction interface 100 to inform the user that the current main control module executes the second working mode.

[0072] When the main control module determines to execute the third working mode, the main control module transmits the third flag information to the smart device through the wireless module, and after the smart device receives the third flag information, the display control 110 displays the set third UI element in the main control human-computer interaction interface 100 to inform the user that the current main control module executes the third working mode.

[0073] When the main control module determines to execute the fourth working mode, the main control module transmits the fourth flag information to the smart device through the wireless module, and after the smart device receives the fourth flag information, the display control 110 displays the set fourth UI element in the main control human-computer interaction interface 100 to inform the user that the current main control module executes the fourth working mode.

[0074] In some further specific embodiments, the smart device is a smart phone.

[0075] This system, by setting up intelligent devices and utilizing the main control human-computer interaction interface 100, enables people to better determine the current working mode of the system, thereby enhancing human-computer interaction and improving the ease of use of the system.

[0076] It will be appreciated by those skilled in the art that all or some of the steps and systems in the methods disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or transient medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. As is well known to those skilled in the art, communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0077] A computer-readable storage medium is provided, in which a program executable by a processor is stored. When the program executable by the processor is executed by the processor, it is used to implement the control steps described in any one of the above embodiments.

[0078] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0079] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0080] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0081] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0082] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0083] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, referred to as ROM), random access memory (Random Access Memory, referred to as RAM), disk or optical disk and other media that can store program codes.

[0084] Although the description of the present application has been quite detailed and specifically describes several described embodiments, it is not intended to be limited to any of these details or embodiments or any particular embodiment, but should be regarded as providing a broad possible interpretation of these claims by reference to the attached claims, taking into account the prior art, so as to effectively cover the intended scope of the present application. In addition, the above description of the present application is based on the embodiments foreseeable by the inventor, and its purpose is to provide a useful description, and those non-substantial changes to the present application that have not yet been foreseen may still represent equivalent changes to the present application.

Claims

1. A wide voltage bidirectional inverter system, characterized in that: include: Energy storage battery, Boost-Buck converter module, photovoltaic interface, first drive module, second drive module, main control module, control module, bidirectional battery charge and discharge module, bidirectional rectifier inverter module, load output module and mains input module; The Boost-Buck converter module is connected to the first input and output end of the bidirectional battery charge and discharge module; the photovoltaic interface is arranged between the Boost-Buck converter module and the first input and output end of the bidirectional battery charge and discharge module, and the photovoltaic interface is used to connect to an external photovoltaic array; The second input and output end of the bidirectional battery charging and discharging module is connected to the first input and output end of the bidirectional rectifier inverter module, and the second input and output end of the bidirectional rectifier inverter module is respectively connected to the load output module and the mains input module; the output end of the second driving module is connected to the control end of the bidirectional battery charging and discharging module, the first acquisition end of the control module is connected to the bidirectional rectifier inverter module, and the second acquisition end of the control module is connected to the mains input module; the output end of the control module is connected to the input end of the second driving module; The output end of the first driving module is connected to the input end of the Boost-Buck converter module; the first output end of the main control module is connected to the input end of the first driving module, the second output end of the main control module is connected to the control end of the load input module, and the third output end of the main control module is connected to the control end of the main power input module; The load output module is used to connect to an external load, and the mains input module is used to connect to an external AC power source; The main control module is used to control the load output module to connect to an external load, and the main control module is used to control the mains input module to connect to an external alternating current; the main control module is used to receive an external working mode signal to determine whether to execute the first working mode, the second working mode, the third working mode or the fourth working mode; Among them, in the first working mode, the external AC power and the energy storage battery simultaneously power the external load; in the second working mode, the energy storage battery independently powers the external load; in the third working mode, the external AC power charges the energy storage battery; in the fourth working mode, the external photovoltaic array charges the energy storage battery.

2. A wide voltage bidirectional inverter system according to claim 1, characterized in that: In the first working mode, the main control module controls the load output module to access the external load, and the main control module controls the mains input module to access the external alternating current; The main control module controls the first driving module to drive the Boost-Buck converter module, so that the energy storage battery outputs a first current and a first voltage to the load output module, and the first current and the first voltage pass through the bidirectional battery charging and discharging module and the bidirectional rectifying and inverter module in sequence; the control module determines the first frequency characteristic of the loop according to the first current and the first voltage passing through the bidirectional rectifying and inverter module; The control module determines a second frequency characteristic according to a second current and a second voltage of the external alternating current input; Using the second frequency characteristic as compensation for the first frequency characteristic, determining a target frequency characteristic; A PWM signal is output according to the target frequency characteristic to control the second driving module, thereby adjusting the bidirectional battery charging and discharging module to adjust the first current and the first voltage flowing through the bidirectional battery charging and discharging module, so that the target frequency characteristic meets the set requirements.

3. A wide voltage bidirectional inverter system according to claim 1, characterized in that: In the second working mode, the main control module controls the load output module to connect to the external load, and the main control module controls the mains input module not to connect to the external AC power; The main control module controls the first driving module to drive the Boost-Buck converter module, so that the energy storage battery outputs a first current and a first voltage to the load output module, and the first current and the first voltage pass through the bidirectional battery charging and discharging module and the bidirectional rectifying and inverter module in sequence; The control module determines the frequency characteristics of the loop according to the first current and the first voltage passing through the bidirectional rectifier inverter module; using the frequency feature as a target frequency feature; A PWM signal is output according to the target frequency characteristic to control the second driving module, thereby adjusting the bidirectional battery charging and discharging module to adjust the first current and the first voltage flowing through the bidirectional battery charging and discharging module, so that the target frequency characteristic meets the set requirements.

4. A wide voltage bidirectional inverter system according to claim 1, characterized in that: In the third working mode, the main control module controls the load output module not to be connected to an external load, and the main control module controls the mains input module to be connected to external alternating current; The main control module controls the first driving module to drive the Boost-Buck converter module, so that the external alternating current outputs a second current and a second voltage toward the energy storage battery; The second current and the second voltage pass through the bidirectional rectifying and inverting module and the bidirectional battery charging and discharging module in sequence; the control module determines the frequency characteristics of the loop according to the second current and the second voltage passing through the bidirectional rectifying and inverting module; and uses the frequency characteristics as the target frequency characteristics; A PWM signal is output according to the target frequency characteristic to control the second driving module, thereby adjusting the bidirectional battery charging and discharging module to adjust the second current and the second voltage flowing through the bidirectional battery charging and discharging module, so that the target frequency characteristic meets the set requirements.

5. A wide voltage bidirectional inverter system according to claim 1, characterized in that: In the fourth working mode, the main control module controls the load output module not to be connected to an external load, and the main control module controls the mains input module not to be connected to an external alternating current; The main control module controls the first driving module to drive the Boost-Buck converter module, so that the external photovoltaic array outputs a third current and a third voltage toward the energy storage battery.

6. A wide voltage bidirectional inverter system according to claim 2, characterized in that: The control module includes: a PLL power calculation module, a PLL module, a voltage and current dual-loop control module, an adaptive module and a VSG algorithm module; In the first working mode, the PLL power calculation module obtains the first current and the first voltage passing through the bidirectional rectifier inverter module, and calculates the first power and the first power factor of the loop according to the first current and the first voltage; the adaptive module is pre-set with optimization parameters; The VSG algorithm module is used to obtain the frequency characteristics of the current loop through a virtual synchronous generator algorithm according to the first power, the first power factor and the optimization parameter, and record the frequency characteristics as the first frequency characteristics; The PLL module obtains a second current and a second voltage of the external alternating current through the mains input module, determines a frequency characteristic of the external alternating current according to the first current and the second voltage, and records the frequency characteristic as a second frequency characteristic.

7. A wide voltage bidirectional inverter system according to claim 3, characterized in that: The control module includes: a PLL power calculation module, a PLL module, a voltage and current dual-loop control module, an adaptive module and a VSG algorithm module; In the second working mode, the PLL power calculation module obtains the first current and the first voltage passing through the bidirectional rectifier inverter module, and calculates the power and the power factor of the loop according to the first current and the first voltage; the adaptive module is pre-set with optimization parameters; The VSG algorithm module is used to obtain the frequency characteristics of the current loop through a virtual synchronous generator algorithm according to the power, power factor and optimization parameters; and use the frequency characteristics as the target frequency characteristics.

8. A wide voltage bidirectional inverter system according to claim 4, characterized in that: The control module includes: a PLL power calculation module, a PLL module, a voltage and current dual-loop control module, an adaptive module and a VSG algorithm module; In the third working mode, the PLL power calculation module obtains the second current and the second voltage passing through the bidirectional rectifier inverter module, and calculates the second power and the second power factor of the loop according to the second current and the second voltage; the adaptive module is pre-set with optimization parameters; The VSG algorithm module is used to obtain the frequency characteristics of the current loop through a virtual synchronous generator algorithm according to the second power, the second power factor and the optimization parameters, and use the frequency characteristics as the target frequency characteristics.

9. A wide voltage bidirectional inverter system according to claim 1, characterized in that: The energy storage battery is a lithium battery.

10. A wide voltage bidirectional inverter system according to claim 1, characterized in that: It also includes a wireless module, which is connected to the main control module and is used to receive an external working mode signal and transmit the working mode signal to the main control module.

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