Wide voltage bidirectional inverter system

Abstract

The application discloses a wide-voltage bidirectional inverter system, comprising 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 and inversion module, a load output module and a commercial power input module; the main control module is used for receiving an external working mode signal to determine whether to execute a first working mode, a second working mode, a third working mode or a fourth working mode. The application sets 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 and inversion module, the load output module and the commercial power input module, and controls each module reasonably by the main control module, so that various working modes are realized, the application scenarios of the system are widened, and the scene applicability is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of inverters, in particular to a wide voltage bidirectional inverter system. BACKGROUND

[0002] At present, the common energy storage inverter system in the market mainly consists of photovoltaic components PV, MPPT controller, bidirectional AC / DC rectifier inverter circuit, energy storage battery and the like. Among them, the MPPT controller, the bidirectional battery charging and discharging circuit and the bidirectional rectifier inverter circuit are connected in a common DC bus mode, the Boost converter topology is used as the main circuit of the MPPT controller, the output voltage is relatively high, and there is a safety hazard. Moreover, the working mode of the whole photovoltaic energy storage inverter system is single, and the application scene is single. Therefore, how to improve the richness of the energy storage inverter system is a technical problem urgently needed to be researched in the industry. SUMMARY

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

[0004] The present application 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 charging and discharging module, a bidirectional rectifier inverter module, a load output module and a mains input module.

[0005] The Boost-Buck converter module is connected with the first input and output end of the bidirectional battery charging and discharging module; the photovoltaic interface is arranged between the Boost-Buck converter module and the first input and output end of the bidirectional battery charging and discharging module, and the photovoltaic interface is used to connect with an external photovoltaic array;

[0006] The second input and output end of the bidirectional battery charging and discharging module is connected with the first input and output end of the bidirectional rectifier inverter module, the second input and output end of the bidirectional rectifier inverter module is respectively connected with the load output module and the mains input module; the output end of the second drive module is connected with the control end of the bidirectional battery charging and discharging module, the first collection end of the control module is connected with the bidirectional rectifier inverter module, the second collection end of the control module is connected with the mains input module; the output end of the control module is connected with the input end of the second drive module.

[0007] The output end of the first driving module is connected with the input end of the Boost-Buck converter module; the first output end of the master control module is connected with the input end of the first driving module, the second output end of the master control module is connected with the control end of the load input module, and the third output end of the master control module is connected with the control end of the commercial power input module;

[0008] The load output module is used for being connected with an external load, and the commercial power input module is used for being connected with an external alternating current power supply;

[0009] The master control module is used for controlling the load output module to be connected with or not to be connected with the external load, and is used for controlling the commercial power input module to be connected with or not to be connected with the external alternating current power; the master 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;

[0010] In the first working mode, the external alternating current and the energy storage battery simultaneously supply power to the external load; in the second working mode, the energy storage battery independently supplies power to the external load; in the third working mode, the external alternating current charges the energy storage battery; and in the fourth working mode, the external photovoltaic array charges the energy storage battery.

[0011] Further, in the first working mode, the master control module controls the load output module to be connected with the external load, and controls the commercial power input module to be connected with the external alternating current;

[0012] The master 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 rectification and inversion module in sequence; the control module determines a first frequency characteristic of a loop according to the first current and the first voltage passing through the bidirectional rectification and inversion module;

[0013] The control module determines a second frequency characteristic according to a second current and a second voltage input by the external alternating current; the second frequency characteristic is used as compensation of the first frequency characteristic to determine a target frequency characteristic;

[0014] A PWM signal is output according to the target frequency characteristic to control the second driving module, so that the bidirectional battery charging and discharging module is adjusted, the first current and the first voltage passing through the bidirectional battery charging and discharging module are adjusted, and the target frequency characteristic meets the set requirement.

[0015] Further, in the second working mode, the master control module controls the load output module to be connected with the external load, and controls the commercial power input module not to be connected with the external alternating current;

[0016] 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 rectification and inversion module in sequence;

[0017] The control module determines the frequency characteristic of the loop according to the first current and the first voltage passing through the bidirectional rectification and inversion module, and takes the frequency characteristic as a target frequency characteristic;

[0018] The control module determines the frequency characteristic of the loop according to the first current and the first voltage passing through the bidirectional rectification and inversion module, and takes the frequency characteristic as a target frequency characteristic;

[0019] Further, in the third working mode, the main control module controls the load output module to be not connected to an external load, and controls the mains input module to be connected to external alternating current;

[0020] 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 rectification and inversion module in sequence;

[0021] The control module determines the frequency characteristic of the loop according to the first current and the first voltage passing through the bidirectional rectification and inversion module, and takes the frequency characteristic as a target frequency characteristic;

[0022] The control module determines the frequency characteristic of the loop according to the first current and the first voltage passing through the bidirectional rectification and inversion module, and takes the frequency characteristic as a target frequency characteristic;

[0023] Further, in the fourth working mode, the main control module controls the load output module to be not connected to an external load, and controls the mains input module to be not connected to external alternating current;

[0024] 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 rectification and inversion module in sequence;

[0025] Further, the control module comprises a PLL power calculation module, a PLL module, a voltage and current double-loop control module, an adaptive module and a VSG algorithm module;

[0026] In the first working mode, the PLL power calculation module obtains a first current and a first voltage passing through the bidirectional rectification inversion module, and calculates a first power and a first power factor of a loop according to the first current and the first voltage; the adaptive module is provided with an optimization parameter in advance;

[0027] The VSG algorithm module is configured to obtain a frequency characteristic of a current loop according to the first power, the first power factor and the optimization parameter through a virtual synchronous generator algorithm, and record the frequency characteristic as a first frequency characteristic.

[0028] The PLL module obtains a second current and a second voltage of external alternating current accessed through the power input module, and 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.

[0029] Further, the control module comprises a PLL power calculation module, a PLL module, a voltage and current double-loop control module, an adaptive module and a VSG algorithm module.

[0030] In the second working mode, the PLL power calculation module obtains a first current and a first voltage passing through the bidirectional rectification inversion module, and calculates a power and a power factor of a loop according to the first current and the first voltage; the adaptive module is provided with an optimization parameter in advance;

[0031] The VSG algorithm module is configured to obtain a frequency characteristic of a current loop according to the power, the power factor and the optimization parameter through a virtual synchronous generator algorithm, and record the frequency characteristic as a first frequency characteristic.

[0032] Further, the control module comprises a PLL power calculation module, a PLL module, a voltage and current double-loop control module, an adaptive module and a VSG algorithm module.

[0033] In the third working mode, the PLL power calculation module obtains a second current and a second voltage passing through the bidirectional rectification inversion module, and calculates a second power and a second power factor of a loop according to the second current and the second voltage; the adaptive module is provided with an optimization parameter in advance;

[0034] The VSG algorithm module is configured to obtain a frequency characteristic of a current loop according to the second power, the second power factor and the optimization parameter through a virtual synchronous generator algorithm, and record the frequency characteristic as a first frequency characteristic.

[0035] Further, the energy storage battery is a lithium battery.

[0036] Further, the wide-voltage bidirectional inverter system further comprises a wireless module connected with the main control module, the wireless module is used for receiving an external working mode signal and transmitting the working mode signal to the main control module.

[0037] The present application has at least the following beneficial effects: the present application sets up 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 rectifier inverter module, a load output module and a mains input module. The main control module is used for reasonably controlling each module, so as to realize multiple working modes, thereby widening the application scenarios of the system and improving the scene applicability. BRIEF DESCRIPTION OF DRAWINGS

[0038] The accompanying drawings are included to provide a further understanding of the technical scheme of the present application, and constitute a part of the specification, and are used together with the embodiments of the present application to explain the technical scheme of the present application, and do not constitute a limitation on the technical scheme of the present application.

[0039] Figure 1 is a system structure schematic diagram of the wide-voltage bidirectional inverter system;

[0040] Figure 2 is a module structure schematic diagram of the control module;

[0041] Figure 3 is an interface structure schematic diagram of the main control man-machine interface. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and do not limit the present application.

[0043] 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 can be executed 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 and claims and the above drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0044] In order to facilitate a more clear understanding of the technical scheme of the present application, some necessary technical terms are described below.

[0045] Energy storage battery, the energy storage battery is a device that can convert electrical energy into chemical energy (or physical energy, kinetic energy) and store it, and release the stored energy as electrical energy when needed.

[0046] Boost-Buck converter module refers to a power electronic converter module that has both boost and buck functions.

[0047] A trigger control is a user interface element that can trigger a preset operation or event when the user interacts with the interface (such as clicking, inputting, selecting, etc.) or when specific conditions are met (such as time elapsed, data changes, etc.).

[0048] Intelligent devices refer to any device, instrument, or machine that has computing power.

[0049] A PLL (Phase-Locked Loop) is a closed-loop feedback control system used in electronic engineering for frequency synthesis and phase control. The core of a PLL is a negative feedback control system that ensures the phase of the output signal matches the phase of the input reference signal, or that the frequency of the output signal has a fixed proportional relationship to the frequency of the input signal.

[0050] VSG (Virtual Synchronous Generator) algorithm is a technique that embeds the mathematical model of a synchronous generator into the control algorithm of an inverter, enabling static power electronic devices to simulate the operation of a rotating electric machine.

[0051] PWM (Pulse Width Modulation) is an analog control technique that controls the output by changing the duty cycle of a pulse signal (i.e., the ratio of pulse width to pulse period).

[0052] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the system structure of a wide-voltage bidirectional inverter system. Figure 2 This is a schematic diagram of the control module's structure.

[0053] This application mainly designs an inverter system with a variety of working modes, which can cope with various application scenarios.

[0054] To achieve this objective, this application 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 charging and discharging module, a bidirectional rectifier-inverter module, a load output module, and a mains input module.

[0055] The Boost-Buck converter module is connected with the first input and output end of the bidirectional battery charging and discharging module; the photovoltaic interface is arranged between the Boost-Buck converter module and the first input and output end of the bidirectional battery charging and discharging module, and the photovoltaic interface is used for being connected with an external photovoltaic array.

[0056] The second input and output end of the bidirectional battery charging and discharging module is connected with the first input and output end of the bidirectional rectifier and inverter module, and the second input and output end of the bidirectional rectifier and inverter module is respectively connected with the load output module and the mains input module.

[0057] The output end of the second driving module is connected with the control end of the bidirectional battery charging and discharging module, the first collection end of the control module is connected with the bidirectional rectifier and inverter module, the second collection end of the control module is connected with the mains input module, and the output end of the control module is connected with the input end of the second driving module.

[0058] The output end of the first driving module is connected with the input end of the Boost-Buck converter module; the first output end of the main control module is connected with the input end of the first driving module, the second output end of the main control module is connected with the control end of the load input module, and the third output end of the main control module is connected with the control end of the mains input module.

[0059] The load output module is used for being connected with an external load, and the mains input module is used for being connected with an external alternating current power supply; the main control module is used for controlling the load output module to determine whether the external load is connected, and the main control module is used for controlling the mains input module to determine whether the external alternating current is connected.

[0060] The main control module is used for receiving an external working mode signal to determine whether a first working mode, a second working mode, a third working mode or a fourth working mode is executed; in the first working mode, the external alternating current and the energy storage battery simultaneously supply power to the external load; in the second working mode, the energy storage battery independently supplies power to the external load; in the third working mode, the external alternating current charges the energy storage battery; and in the fourth working mode, the external photovoltaic array charges the energy storage battery.

[0061] The main control module is connected with the bidirectional battery charging and discharging module.

[0062] The bidirectional battery charging and discharging module has charging and discharging functions, that is, the bidirectional battery charging and discharging module can be controlled by the master control module, so that the current flows into the first input and output end of the bidirectional battery charging and discharging module and flows out from the second input and output end of the bidirectional battery charging and discharging module. The bidirectional battery charging and discharging module can also be controlled by the master control module, so that the current flows into the second input and output end of the bidirectional battery charging and discharging module and flows out from the first input and output end of the bidirectional battery charging and discharging module.

[0063] The master control module is connected with the bidirectional rectifier and inverter module.

[0064] The bidirectional rectifier and inverter module has the function of bidirectional current rectification and inversion, that is, the bidirectional current rectification and inversion module can be controlled by the master control module, so that the current flows into the first input and output end of the bidirectional rectifier and inverter module and flows out from the second input and output end of the bidirectional rectifier and inverter module. The bidirectional rectifier and inverter module can also be controlled by the master control module, so that the current flows into the second input and output end of the bidirectional rectifier and inverter module and flows out from the first input and output end of the bidirectional rectifier and inverter module.

[0065] The master control module is configured with four working modes, namely: first working mode, second working mode, third working mode and fourth working mode.

[0066] The first working mode is mainly for the application scenario of simultaneously supplying power to the load by the external alternating current and the energy storage battery.

[0067] At this time, the master control module controls the mains input module and the load output module. So that the load output module accesses the external load, and the mains input module accesses the external alternating current.

[0068] The master control module calls the control program of the first working mode configured by it. So that the master 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 and inverter module in turn; 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 and inverter module;

[0069] The control module determines the second frequency characteristic according to the second current and the second voltage input by the external alternating current;

[0070] The second frequency characteristic is used as compensation for the first frequency characteristic to determine the target frequency characteristic;

[0071] According to the target frequency characteristic, a PWM signal is output to control the second driving module, so as to adjust 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.

[0072] The control module comprises a PLL power calculation module, a PLL module, a voltage and current double-loop control module, an adaptive module and a VSG algorithm module.

[0073] In the first working mode, the PLL power calculation module obtains the first current and the first voltage flowing 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 provided with an optimization parameter in advance; the VSG algorithm module is used to obtain the frequency characteristic of the current loop through the virtual synchronous generator algorithm according to the first power, the first power factor and the optimization parameter, and the frequency characteristic is recorded as a first frequency characteristic. The PLL module obtains the second current and the second voltage of the external alternating current accessed through the mains input module, and determines the 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.

[0074] The second working mode is mainly for the application scenario of independently supplying the external load by the energy storage battery alone.

[0075] At this time, the main control module controls the mains input module and the load output module. Thus, the load output module accesses the external load, and the mains input module does not access the external alternating current.

[0076] The main control module calls the control program of the second 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 turn.

[0077] The control module determines the frequency characteristic of the loop according to the first current and the first voltage flowing through the bidirectional rectifier inverter module; and the frequency characteristic is taken as a target frequency characteristic.

[0078] According to the target frequency characteristic, a PWM signal is output to control the second driving module, so as to adjust 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.

[0079] The control module comprises a PLL power calculation module, a PLL module, a voltage and current double-loop control module, an adaptive module and a VSG algorithm module.

[0080] The third working mode is mainly applied to the scenario of charging the energy storage battery by external alternating current.

[0081] At this time, the main control module controls the mains input module and the load output module, so that the load output module is not connected to the external load, and the mains input module is connected to the external alternating current.

[0082] The main control module calls the control program of the third 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 external alternating current outputs the second current and the second voltage to the energy storage battery.

[0083] The second current and the second voltage pass through the bidirectional rectifier inverter module and the bidirectional battery charging and discharging module in sequence.

[0084] The control module determines the frequency characteristic of the loop according to the second current and the second voltage passing through the bidirectional rectifier inverter module, and takes the frequency characteristic as the target frequency characteristic.

[0085] According to the target frequency characteristic, a PWM signal is output to control the second driving module, so as to adjust the bidirectional battery charging and discharging module, adjust the second current and the second voltage flowing through the bidirectional battery charging and discharging module, and make the target frequency characteristic meet the set requirements.

[0086] The control module comprises a PLL power calculation module, a PLL module, a voltage and current double-loop control module, an adaptive module and a VSG algorithm module.

[0087] 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 provided with an optimization parameter in advance; the VSG algorithm module is used to obtain the frequency characteristic of the current loop by a virtual synchronous generator algorithm according to the second power, the second power factor and the optimization parameter, and take the frequency characteristic as the target frequency characteristic.

[0088] The fourth working mode is mainly for the application scenario of independently supplying the energy storage battery by the external photovoltaic array.

[0089] At this time, the main control module controls the mains input module and the load output module, so that the load output module is not connected to the external load, and the mains input module is not connected to the external alternating current.

[0090] The main control module calls the control program of the fourth 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 external photovoltaic array outputs the third current and the third voltage to the energy storage battery.

[0091] In some further embodiments, the energy storage battery is a lithium battery.

[0092] In order to make the main control module better obtain the external working mode signal, the wide voltage bidirectional inverter system further comprises a wireless module. The wireless module is connected with the main control module, and the wireless module is used for receiving the external working mode signal and transmitting the working mode signal to the main control module.

[0093] The present application sets up 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 rectifier inverter module, a load output module and a mains input module, and utilizes the main control module to reasonably control each module, so as to realize multiple working modes, thereby widening the application scenario of the system and improving the scene applicability.

[0094] Reference Figure 3 , Figure 3 is a schematic diagram of the interface structure of the main control human-computer interaction interface.

[0095] In some further embodiments, the wide voltage bidirectional inverter system further comprises a smart device, and the smart device is connected with the wireless module.

[0096] 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.

[0097] The smart device obtains the position coordinates of the trigger event of the user on the main control human-computer interaction interface 100 in real time, and determines which mode trigger control is triggered by the user according to the position coordinates.

[0098] Specifically, when the position coordinate belongs to the position coordinate set of the sensing area of the first mode trigger control 101, it is considered that the user triggers the first mode trigger control 101. When the position coordinate belongs to the position coordinate set of the sensing area of the second mode trigger control 102, it is considered that the user triggers the second mode trigger control 102. When the position coordinate belongs to the position coordinate set of the sensing area of the third mode trigger control 103, it is considered that the user triggers the third mode trigger control 103. When the position coordinate belongs to the position coordinate set of the sensing area of the fourth mode trigger control 104, it is considered that the user triggers the fourth mode trigger control 104.

[0099] When the smart device determines that the first mode trigger control 101 is triggered, it communicates with the wireless module and transmits the pre-set signal representing the first working mode to the wireless module, so that the wireless module can transmit the signal of the first working mode to the master control module. Thus, the master control module is informed that the first working mode needs to be executed.

[0100] When the smart device determines that the second mode trigger control 102 is triggered, it communicates with the wireless module and transmits the pre-set signal representing the second working mode to the wireless module, so that the wireless module can transmit the signal of the second working mode to the master control module. Thus, the master control module is informed that the second working mode needs to be executed.

[0101] When the smart device determines that the third mode trigger control 103 is triggered, it communicates with the wireless module and transmits the pre-set signal representing the third working mode to the wireless module, so that the wireless module can transmit the signal of the third working mode to the master control module. Thus, the master control module is informed that the third working mode needs to be executed.

[0102] When the smart device determines that the fourth mode trigger control 104 is triggered, it communicates with the wireless module and transmits the pre-set signal representing the fourth working mode to the wireless module, so that the wireless module can transmit the signal of the fourth working mode to the master control module. Thus, the master control module is informed that the fourth working mode needs to be executed.

[0103] When the master control module determines to execute the first working mode, the master control module transmits the first flag information to the smart device through the wireless module. After the smart device receives the first flag information, the display control 110 displays the set first UI element in the master human-computer interaction interface 100, so as to inform the user that the master control module executes the first working mode.

[0104] When the master module determines to execute the second working mode, the master module will transmit second flag information to the intelligent device through the wireless module, after the intelligent device receives the second flag information, the display control 110 will display the set second UI element in the master human-computer interaction interface 100, so as to inform the user that the master module currently executes the second working mode.

[0105] When the master module determines to execute the third working mode, the master module will transmit third flag information to the intelligent device through the wireless module, after the intelligent device receives the third flag information, the display control 110 will display the set third UI element in the master human-computer interaction interface 100, so as to inform the user that the master module currently executes the third working mode.

[0106] When the master module determines to execute the fourth working mode, the master module will transmit fourth flag information to the intelligent device through the wireless module, after the intelligent device receives the fourth flag information, the display control 110 will display the set fourth UI element in the master human-computer interaction interface 100, so as to inform the user that the master module currently executes the fourth working mode.

[0107] In some further specific embodiments, the intelligent device is a smart phone.

[0108] The system sets the intelligent device, uses the master human-computer interaction interface 100, so that people can better determine the working mode of the current system, enhances the human-computer interaction, and improves the ease of use of the system.

[0109] Those skilled in the art can understand that all or some of the steps in the method disclosed above can be implemented by software, firmware, hardware, or a combination thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on computer readable media, which can include computer storage media (or non-transitory media) and communication media (or transitory media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. As is 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 includes any information delivery media.

[0110] A computer readable storage medium is provided, in which a processor executable program is stored, the processor executable program is executed by a processor to implement the control step according to any one of the above embodiments.

[0111] The terms "first", "second", "third", "fourth" etc. (if any) in the description of the application and in the above drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a particular order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented, for example, in an order other than that illustrated or described herein. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0112] It should be understood that, in the application, "at least one" refers to one or more, and "multiple" refers to two or more. "And / or" is used to describe the association relationship of the associated objects, which means that there can be three relationships, for example, "A and / or B" can represent three cases of only A, only B, and A and B existing at the same time, wherein A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after it. "At least one of the following" or similar expressions means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b or c can represent a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, and c can be single or multiple.

[0113] In several embodiments provided in the application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division, and actual implementation can have another division manner. For example, a plurality of units or components can be combined or integrated into another system, or some features can be omitted or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or other forms.

[0114] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0115] In addition, the functional units in each embodiment of the application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0116] The integrated unit, if implemented in the form of a software function unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0117] Although the description of the present application has been quite detailed and particularly described with respect to several described embodiments, it is not intended to be limited to any of these details or embodiments or any special embodiment, but should be considered to effectively cover the intended scope of the present application by referring to the appended claims, taking into account the broadest possible interpretation of these claims in view of the prior art. In addition, the present application is described above in embodiments that the inventors can foresee, and the purpose is to provide a useful description, and non-essential modifications to the present application that have not yet been foreseen can still represent equivalent modifications to the present application.

Claims

1. A wide voltage bidirectional inverter system, characterized by, The application relates to a photovoltaic energy storage system, which comprises the following parts: 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 and inversion module, a load output module and a commercial power input module. The Boost-Buck converter module is connected with the first end of the bidirectional battery charging and discharging module; the photovoltaic interface is arranged between the Boost-Buck converter module and the first end of the bidirectional battery charging and discharging module. The second end of the bidirectional battery charging and discharging module is connected with the first end of the bidirectional rectification and inversion module, the second end of the bidirectional rectification and inversion module is connected with the load output module and the commercial power input module respectively, the output end of the second driving module is connected with the control end of the bidirectional battery charging and discharging module, the first collection end of the control module is connected with the bidirectional rectification and inversion module, the second collection end of the control module is connected with the commercial power input module, and the output end of the control module is connected with the input end of the second driving module. The output end of the first driving module is connected with the input end of the Boost-Buck converter module; the first output end of the main control module is connected with the input end of the first driving module, the second output end of the main control module is connected with the control end of the load output module, and the main control module is used for controlling the load output module to determine whether the load output module is connected with an external load. The third output end of the main control module is connected with the control end of the commercial power input module, and the main control module is used for controlling the commercial power input module to determine whether the commercial power input module is connected with external alternating current. The main control module is used for receiving an external working mode signal to determine whether a first working mode, a second working mode, a third working mode or a fourth working mode is executed. In the first working mode, the external alternating current and the energy storage battery supply power to the external load at the same time; in the second working mode, the energy storage battery supplies power to the external load independently; in the third working mode, the external alternating current charges the energy storage battery; and in the fourth working mode, an external photovoltaic array charges the energy storage battery. In the first working mode, 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 control module determines a first frequency characteristic of a loop according to the first current and the first voltage passing through the bidirectional rectification and inversion module. The control module determines a second frequency characteristic according to a second current and a second voltage input by external alternating current, and takes the second frequency characteristic as compensation of 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, so that the bidirectional battery charging and discharging module is adjusted, the first current and the first voltage passing through the bidirectional battery charging and discharging module are adjusted, and the target frequency characteristic meets the set requirement. In the second working mode, the main control module controls the load output module to be connected with the external load, and the main control module controls the commercial power input module to be not connected with the external alternating current.

2. A wide voltage bidirectional inverter system as claimed in claim 1, wherein, ​ The master 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 rectification and inversion module in sequence. The control module determines a frequency characteristic of a loop according to the first current and the first voltage passing through the bidirectional rectification and inversion module. The frequency characteristic is taken as a target frequency characteristic. A PWM signal is output according to the target frequency characteristic to control the second driving module, so that the bidirectional battery charging and discharging module is adjusted, the first current and the first voltage passing through the bidirectional battery charging and discharging module are adjusted, and the target frequency characteristic meets the set requirement.

3. A wide voltage bidirectional inverter system as claimed in claim 1, wherein, In the third working mode, the master control module controls the load output module to be not connected to an external load, and controls the commercial power input module to be connected to external alternating current. The master 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 to the energy storage battery. The second current and the second voltage pass through the bidirectional rectification and inversion module and the bidirectional battery charging and discharging module in sequence. The control module determines a frequency characteristic of a loop according to the second current and the second voltage passing through the bidirectional rectification and inversion module.

4. A wide voltage bidirectional inverter system as claimed in claim 1, wherein, The frequency characteristic is taken as a target frequency characteristic. A PWM signal is output according to the target frequency characteristic to control the second driving module, so that the bidirectional battery charging and discharging module is adjusted, the second current and the second voltage passing through the bidirectional battery charging and discharging module are adjusted, and the target frequency characteristic meets the set requirement.

5. A wide voltage bidirectional inverter system as claimed in claim 1, wherein, In the fourth working mode, the master control module controls the load output module to be not connected to an external load, and controls the commercial power input module to be not connected to external alternating current. The master 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 to the energy storage battery. The control module comprises a PLL power calculation module, a PLL module, a voltage and current double-loop control module, an adaptive module and a VSG algorithm module. In the first working mode, the PLL power calculation module obtains a first current and a first voltage passing through the bidirectional rectification and inversion module, and calculates a first power and a first power factor of a loop according to the first current and the first voltage. The adaptive module is provided with an optimization parameter in advance. The VSG algorithm module is used to obtain a frequency characteristic of a current loop by a virtual synchronous generator algorithm according to the first power, the first power factor and the optimization parameter, and the frequency characteristic is recorded as a first frequency characteristic. The PLL module obtains a second current and a second voltage of external alternating current connected by the commercial power input module, and 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.

6. A wide voltage bidirectional inverter system according to claim 2, wherein, The control module comprises a PLL power calculation module, a PLL module, a voltage and current double-loop control module, an adaptive module and a VSG algorithm module; In the second working mode, the PLL power calculation module acquires a first current and a first voltage passing through the bidirectional rectification inversion module, and calculates a power and a power factor of a loop according to the first current and the first voltage; the adaptive module is provided with an optimization parameter in advance; The VSG algorithm module is used for obtaining a frequency characteristic of a current loop according to the power, the power factor and the optimization parameter through a virtual synchronous generator algorithm, and taking the frequency characteristic as a target frequency characteristic.

7. A wide voltage bidirectional inverter system as claimed in claim 3, wherein, The control module comprises a PLL power calculation module, a PLL module, a voltage and current double-loop control module, an adaptive module and a VSG algorithm module; In the third working mode, the PLL power calculation module acquires a second current and a second voltage passing through the bidirectional rectification inversion module, and calculates a second power and a second power factor of a loop according to the second current and the second voltage; the adaptive module is provided with an optimization parameter in advance; The VSG algorithm module is used for obtaining a frequency characteristic of a current loop according to the second power, the second power factor and the optimization parameter through a virtual synchronous generator algorithm, and taking the frequency characteristic as a target frequency characteristic.

8. A wide voltage bidirectional inverter system as claimed in claim 1, wherein, The energy storage battery is a lithium battery.

9. A wide voltage bidirectional inverter system as claimed in claim 1, wherein, Further comprising a wireless module connected with the main control module, the wireless module is used for receiving an external working mode signal and transmitting the working mode signal to the main control module.

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