Energy storage converter

Abstract

The present invention relates to the field of energy storage inverters. More specifically, the present invention relates to an energy storage inverter. Aiming at the problems of low efficiency and insufficient safety of existing energy storage inverters during grid-connected charging and discharging, the present invention adopts the following energy storage inverter, including multiple groups of energy storage components, control circuits and temperature acquisition modules, so as to achieve the effect of improving the high power, high reliability and flexibility of the energy storage inverter.

Description

Technical Field

[0001] The present invention relates to the field of energy storage converters. More specifically, the present invention relates to an energy storage converter. Background Art

[0002] Energy storage inverters are an important component of the power system, mainly used to achieve efficient energy conversion between the power grid and the energy storage device. With the rapid development of renewable energy and the growing demand for smart grid construction, the application scope of energy storage inverters continues to expand, and their performance and reliability directly affect the stability and economy of the entire power system. At present, energy storage inverters are widely used in wind power generation, photovoltaic power generation, electric vehicle charging stations and other fields. Through efficient energy management and scheduling, energy utilization efficiency is improved, carbon emissions are reduced, and green and sustainable development is promoted.

[0003] Existing energy storage converters usually use a single power module for energy conversion and realize charging and discharging functions through simple switch control. Specifically, common technical means include:

[0004] (1) Use a single bidirectional DC / AC converter to directly connect the energy storage battery and the grid;

[0005] (2) A filter is set between the energy storage battery and the converter to reduce harmonic interference;

[0006] (3) The high voltage electricity output by the converter is transmitted to the external grid or load through a transformer. Although these methods can basically meet the energy storage needs, they have some shortcomings in practical applications.

[0007] The above common methods have obvious limitations when dealing with large-scale energy storage scenarios, mainly manifested in the following aspects:

[0008] (1) The capacity of a single power module is limited, making it difficult to adapt to high-power, high-reliability application scenarios;

[0009] (2) The lack of an effective multi-module collaborative working mechanism leads to low overall system efficiency;

[0010] (3) It is impossible to flexibly adjust the working state of each energy storage component, which affects the dynamic response speed and stability of the system. These problems limit the application effect of energy storage converters under complex working conditions and urgently need to be improved and perfected. Summary of the invention

[0011] The purpose of the present invention is to address the problems of low efficiency and insufficient safety of existing energy storage inverters during grid-connected charging and discharging, and to adopt the following energy storage inverter, including multiple groups of energy storage components, control circuits and temperature acquisition modules, so as to achieve the effect of improving the high power, high reliability and flexibility of the energy storage inverter.

[0012] In order to achieve these purposes and other advantages according to the present invention, there is provided an energy storage converter, comprising:

[0013] A plurality of energy storage components, wherein the energy storage components include a charge-discharge module, a first power module, a filter and a transformer, wherein the charge-discharge module is electrically connected to the first power module and a first switch is provided on a connection line between the two, the first power module is electrically connected to the filter and a second switch is provided on a connection line between the two, the filter is electrically connected to the transformer, the transformer is electrically connected to an external network, and adjacent first power modules are electrically connected and a third switch is provided on a connection line between the two;

[0014] A control circuit, wherein the first power module, the first switch, the second switch and the third switch are electrically connected to the control circuit respectively.

[0015] Furthermore, in the energy storage converter, the first power module is a bidirectional DC / AC converter.

[0016] Furthermore, in the energy storage converter, the energy storage component further comprises:

[0017] A second power module, which is electrically connected to the charging and discharging module;

[0018] A power generation unit is electrically connected to the second power module.

[0019] Furthermore, in the energy storage converter, the second power module is a DC / DC converter.

[0020] Furthermore, in the energy storage converter, the power generation unit is a new energy power generation device.

[0021] Furthermore, in the energy storage converter, a fourth switch is provided on the connection line between the charging and discharging module and the second power module, and the fourth switch is electrically connected to the control circuit.

[0022] Furthermore, the energy storage converter further comprises:

[0023] A temperature acquisition module is electrically connected to the plurality of charging and discharging modules respectively to acquire the electrical temperature of the temperature acquisition module. The temperature acquisition module is electrically connected to the control circuit.

[0024] Furthermore, in the energy storage converter, the temperature acquisition module includes a plurality of temperature sensors, the number of the temperature sensors is equal to and corresponds one to one with the charge and discharge modules, and the temperature sensors are used to acquire the temperature of the corresponding charge and discharge modules.

[0025] The present invention also provides an energy storage converter control method, which uses any of the energy storage converters described above, and comprises the following steps:

[0026] The control circuit obtains the working mode of the energy storage converter;

[0027] The control circuit adjusts the working states of the multiple groups of energy storage components according to the working mode of the energy storage converter:

[0028] When the energy storage converter is connected to the grid for charging, the control circuit controls the first switch and the second switch to be closed, and the third switch to be opened, and the first power module converts the AC power of the external grid into DC power to charge the multiple charging and discharging modules;

[0029] When the energy storage converter is connected to the grid for discharging, the control circuit controls the first switch and the second switch to be closed, and the third switch to be opened, and the first power module converts the DC power of the charging and discharging module into AC power to feed back to the external grid.

[0030] Furthermore, the energy storage converter control method further includes:

[0031] When the energy storage inverter is connected to the grid for discharging, the control circuit controls the first switch to close, selects at least two adjacent charging and discharging modules to be connected in parallel to form a charging and discharging assembly, at which time the third switch between the charging and discharging modules in the charging and discharging assembly is closed, and only one of the second switches corresponding to the charging and discharging assembly is closed.

[0032] In view of the problems of low efficiency and insufficient safety of existing energy storage inverters during grid-connected charging and discharging, the present invention adopts the following energy storage inverter, including multiple groups of energy storage components, a control circuit and a temperature acquisition module, so as to achieve the effect of improving the high power, high reliability and flexibility of the energy storage inverter.

[0033] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of an energy storage converter described in one embodiment of the present invention;

[0035] Figure 2 This is a flow chart of a method for controlling an energy storage converter according to another embodiment of the present invention. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with embodiments so that those skilled in the art can implement the invention with reference to the description.

[0037] It should be noted that, in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] Example 1

[0039] like Figure 1 As shown, an embodiment of the present invention provides an energy storage converter, comprising:

[0040] A plurality of energy storage components, wherein the energy storage components include a charge-discharge module, a first power module, a filter and a transformer, wherein the charge-discharge module is electrically connected to the first power module and a first switch 1 is provided on a connection line between the two, the first power module is electrically connected to the filter and a second switch 2 is provided on a connection line between the two, the filter is electrically connected to the transformer, the transformer is electrically connected to an external network, and adjacent first power modules are electrically connected and a third switch 3 is provided on a connection line between the two;

[0041] Control circuit, the first power module, the first switch 1, the second switch 2 and the third switch 3 are electrically connected to the control circuit voltages respectively.

[0042] Furthermore, in the energy storage converter, the first power module is a bidirectional DC / AC converter.

[0043] Furthermore, in the energy storage converter, the energy storage component further comprises:

[0044] A second power module, which is electrically connected to the charging and discharging module;

[0045] A power generation unit is electrically connected to the second power module.

[0046] Furthermore, in the energy storage converter, the second power module is a DC / DC converter.

[0047] Furthermore, in the energy storage converter, the power generation unit is a new energy power generation device.

[0048] Furthermore, in the energy storage converter, a fourth switch 4 is provided on the connection line between the charging and discharging module and the second power module, and the fourth switch 4 is electrically connected to the control circuit.

[0049] Furthermore, the energy storage converter further comprises:

[0050] A temperature acquisition module is electrically connected to the plurality of charging and discharging modules respectively to acquire the electrical temperature of the temperature acquisition module. The temperature acquisition module is electrically connected to the control circuit.

[0051] Furthermore, in the energy storage converter, the temperature acquisition module includes a plurality of temperature sensors, the number of the temperature sensors is equal to and corresponds one to one with the charge and discharge modules, and the temperature sensors are used to acquire the temperature of the corresponding charge and discharge modules.

[0052] Example 2

[0053] An embodiment of the present invention further provides an energy storage converter control method, which uses any of the energy storage converters described above, and comprises the following steps:

[0054] The control circuit obtains the working mode of the energy storage converter;

[0055] The control circuit adjusts the working states of the multiple groups of energy storage components according to the working mode of the energy storage converter:

[0056] When the energy storage converter is connected to the grid for charging, the control circuit controls the first switch 1 and the second switch 2 to be closed, and the third switch 3 to be opened, and the first power module converts the AC power of the external grid into DC power to charge the multiple charging and discharging modules;

[0057] When the energy storage converter is connected to the grid for discharging, the control circuit controls the first switch 1 and the second switch 2 to be closed, and the third switch 3 to be opened, and the first power module converts the DC power of the charging and discharging module into AC power to feed back to the external grid.

[0058] Furthermore, the energy storage converter control method further includes:

[0059] When the energy storage inverter is connected to the grid for discharging, the control circuit controls the first switch 1 to close, selects at least two adjacent charging and discharging modules to be connected in parallel to form a charging and discharging assembly, at which time the third switch 3 between the charging and discharging modules in the charging and discharging assembly is closed, and only one of the second switches 2 corresponding to the charging and discharging assembly is closed.

[0060] Example 3

[0061] The energy storage converter provided in the embodiment of the present application includes multiple groups of energy storage components, a control circuit and a temperature acquisition module. Each group of energy storage components includes a charging and discharging module, a first power module, a filter and a transformer. The charging and discharging module is electrically connected to the first power module and a first switch 1 is provided on the connecting line between the two, the first power module is electrically connected to the filter and a second switch 2 is provided on the connecting line between the two, the filter is electrically connected to the transformer, the transformer is electrically connected to the external network, and adjacent first power modules are electrically connected and a third switch 3 is provided on the connecting line between the two. The control circuit is electrically connected to the first power module, the first switch 1, the second switch 2 and the third switch 3, respectively. In addition, it also includes a temperature acquisition module, which is electrically connected to the multiple charging and discharging modules, respectively, to collect the temperature of each charging and discharging module, and the temperature acquisition module is also electrically connected to the control circuit.

[0062] Specifically, the charge and discharge module can use lithium-ion batteries or supercapacitors as energy storage media. These two materials have high energy density and long cycle life. For example, lithium-ion batteries are suitable for occasions where a large amount of energy needs to be stored for a long time, while supercapacitors are suitable for scenarios where rapid charging and discharging are required. The charge and discharge module can also be equipped with a heat sink to improve thermal management capabilities and ensure normal operation even in high temperature environments.

[0063] The first power module is a bidirectional DC / AC converter that can achieve efficient conversion between direct current and alternating current. The bidirectional DC / AC converter integrates an inverter and a rectifier. Through high-frequency PWM modulation technology, the output voltage and current can be adjusted over a wide range to meet the requirements of different loads. In order to improve conversion efficiency, the first power module also uses advanced IGBTs (insulated gate bipolar transistors) and MOSFETs (metal oxide field effect transistors). These semiconductor devices have low loss and high voltage resistance characteristics.

[0064] Filters are used to reduce harmonic interference and improve power quality. Filters can be LC filters or multi-stage RC filters. The former is composed of inductors and capacitors, and the latter is composed of resistors and capacitors in series. LC filters have good filtering effects, especially for high-frequency signals; RC filters have simple structures and low costs, and are suitable for low-frequency signals. The design of the filter also needs to consider impedance matching to ensure maximum power transmission.

[0065] The transformer is used to transmit the high voltage output of the converter to the external grid or load. The transformer can be a dry-type transformer or an oil-immersed transformer. The dry-type transformer is small in size and light in weight, suitable for indoor installation; the oil-immersed transformer has good heat dissipation performance and is suitable for high-power applications. The core components of the transformer are the iron core and the winding. The iron core is usually made of stacked silicon steel sheets, and the winding is made of copper wire. In order to improve the utilization rate of magnetic flux, the iron core can adopt an E-shaped or U-shaped structure.

[0066] The control circuit is responsible for coordinating the actions of each switch to realize various working modes of the energy storage converter. The control circuit can be implemented by a microcontroller (MCU) or a DSP (digital signal processor), which has high-speed computing capabilities and real-time control functions. The control circuit can dynamically adjust the state of each switch according to external environmental parameters (such as grid frequency, voltage fluctuations, etc.) and internal state parameters (such as SOC and temperature of the charge and discharge module, etc.) to achieve the best operating effect.

[0067] The temperature acquisition module is used to monitor the temperature of the charge and discharge module to prevent overheating damage. The temperature acquisition module can use multiple temperature sensors, each temperature sensor corresponds to a charge and discharge module. The temperature sensor can be PT100 or NTC thermistor, which has good linearity and stability. The temperature data is transmitted to the control circuit through analog signals or digital signals. The control circuit adjusts the working state of the charge and discharge module according to the temperature data, and cuts off the relevant circuit when necessary to protect the safety of the equipment.

[0068] The implementation principle of this embodiment is: through the collaborative work of multiple groups of energy storage components, high power, high reliability and flexibility of the energy storage inverter are achieved. Each energy storage component is equipped with a charging and discharging module, a first power module, a filter and a transformer, which can work independently or jointly under different working conditions. The control circuit realizes the switching of various working modes such as grid-connected charging and grid-connected discharging through precise control of each switch. The temperature acquisition module monitors the temperature of the charging and discharging module in real time to ensure that the system can operate stably in various environments. This design not only improves the overall efficiency of the system, but also enhances the fault diagnosis and maintenance capabilities, greatly improving the application value of the energy storage inverter.

[0069] Example 4

[0070] The difference between this embodiment and the above embodiment is that a second power module and a power generation unit are added. The second power module is electrically connected to the charge and discharge module, and the power generation unit is electrically connected to the second power module. The second power module is a DC / DC converter for adjusting the input voltage of the charge and discharge module. The power generation unit can be a new energy power generation device such as a solar photovoltaic panel or a wind turbine to provide an additional energy source.

[0071] Specifically, the second power module also uses a high-efficiency DC / DC converter, which supports both boost and buck modes. The converter integrates switching tubes and filter elements, and uses PWM control technology to achieve voltage regulation over a wide range. The selection of DC / DC converters needs to consider their working efficiency and response speed. Common types include Buck converters, Boost converters, and Flyback converters. For example, Buck converters are suitable for reducing voltage, Boost converters are suitable for increasing voltage, and Flyback converters have both boost and buck functions, and are more applicable.

[0072] The power generation unit can be a solar photovoltaic panel or a wind turbine. Solar photovoltaic panels are composed of multiple photovoltaic cells connected in series and parallel, which convert sunlight energy into electrical energy through the photovoltaic effect. The surface of the photovoltaic panel is covered with an anti-reflective coating to increase the light absorption rate. Wind turbines are composed of blades, gearboxes and generators, and the rotation of the wind rotor drives the generator to generate electricity. The design of wind turbines needs to take into account the change of wind speed. Common forms include horizontal axis wind turbines and vertical axis wind turbines.

[0073] A fourth switch 4 is provided on the connection line between the charge-discharge module and the second power module, and the fourth switch 4 is electrically connected to the control circuit. The fourth switch 4 is used to cut off the connection between the second power module and the charge-discharge module when external power supply is not required to avoid unnecessary energy loss. The fourth switch 4 can be a relay or a solid-state relay, the former is low-priced, and the latter has a fast response speed and a long service life.

[0074] The implementation principle of this embodiment is: by introducing a second power module and a power generation unit, the flexibility and self-sufficiency of the energy storage inverter are further improved. The second power module can not only adjust the input voltage of the charging and discharging module, but also work in conjunction with other power supply equipment to achieve effective integration of multiple energy sources. The power generation unit provides an additional source of energy, especially in areas with abundant solar energy or sufficient wind resources, which can significantly improve the overall efficiency of the system. The control circuit ensures that the system can operate efficiently under various working conditions by accurately controlling the state of each switch. This design not only improves the performance of the energy storage inverter, but also lays the foundation for its wide application in distributed energy systems.

[0075] Example 5

[0076] The difference between this embodiment and the above embodiment is that the function of the temperature acquisition module is added. In addition to acquiring the temperature of the charge and discharge module, the temperature acquisition module can also acquire the temperature of the first power module and the filter. The temperature acquisition module includes a plurality of temperature sensors, the number of which is equal to the number of the charge and discharge modules, the first power module and the filter and corresponds one to one, and each temperature sensor is used to acquire the temperature of the corresponding component.

[0077] Specifically, the temperature sensor can be PT100 or NTC thermistor, which has good linearity and stability. Each charging and discharging module, the first power module and the filter can be configured with a temperature sensor, which is transmitted to the control circuit via an analog signal or a digital signal. The control circuit dynamically adjusts the working state of each component according to the received temperature data to prevent overheating.

[0078] For the charge and discharge module, if the temperature is detected to be too high, the control circuit will automatically reduce the charge and discharge power, or even temporarily stop the charge and discharge operation until the temperature returns to normal. This can effectively extend the service life of the charge and discharge module and avoid irreversible damage caused by high temperature. At the same time, the charge and discharge module can also be equipped with a cooling fan or liquid cooling device to enhance the heat dissipation effect.

[0079] For the first power module, if the temperature is detected to exceed the preset threshold, the control circuit will appropriately reduce the output power of the converter, or start the cooling system for cooling. The cooling system of the first power module can adopt natural air cooling, forced air cooling or water cooling, and the specific choice depends on the application scenario and power level. For example, a small household energy storage converter can use natural air cooling, while a large industrial energy storage converter is more suitable for a water cooling system.

[0080] For the filter, if the temperature is abnormal, the control circuit will issue an alarm in time and take measures to reduce the load of the filter. If the temperature of the filter is too high, it will affect its electrical performance and may cause the filter to fail in severe cases, so it must be taken seriously. The filter can also be equipped with a heat sink or other auxiliary heat dissipation device to ensure its normal operation in a high temperature environment.

[0081] The implementation principle of this embodiment is: through a comprehensive temperature monitoring and control mechanism, the safety and reliability of the energy storage inverter are further improved. The temperature acquisition module can not only monitor the temperature of the charging and discharging module in real time, but also synchronously monitor the temperature of the first power module and the filter to ensure that the temperature of the entire system is within a reasonable range. The control circuit dynamically adjusts the working state of each component according to the temperature data, which can not only prevent failures caused by overheating, but also maximize the performance of each component. This design enables the energy storage inverter to maintain stable operation under extreme environmental conditions, greatly improving its applicability and durability.

[0082] Example 6

[0083] The difference between this embodiment and the above embodiment is that a redundant design of the energy storage component is added. That is, on the basis of the original one, a set of spare energy storage components is added. When the main energy storage component fails, the spare energy storage component can be put into use immediately to ensure the continuous operation of the system. The spare energy storage component also includes a charging and discharging module, a first power module, a filter and a transformer, which are completely consistent with the structure and function of the main energy storage component.

[0084] Specifically, the material selection and design of the charge and discharge module, the first power module, the filter and the transformer of the backup energy storage component are the same as those of the main energy storage component. The charge and discharge module can use high-performance lithium-ion batteries or supercapacitors, the first power module is a bidirectional DC / AC converter, the filter uses an LC filter or a multi-stage RC filter, and the transformer can choose a dry transformer or an oil-immersed transformer. All parts of the backup energy storage component are electrically connected to the control circuit for unified management and control.

[0085] In order to achieve the main-backup switching, it is also necessary to set a corresponding switch between the main energy storage component and the backup energy storage component. The switch can use a contactor or relay to ensure that there will be no short circuit or power failure during the switching process. The control circuit automatically determines whether the backup energy storage component needs to be enabled based on the status of the monitored main energy storage component. Once a failure of the main energy storage component is detected, the control circuit will act quickly to connect the backup energy storage component to the system to restore normal energy conversion and transmission.

[0086] The implementation principle of this embodiment is: by adding backup energy storage components, the reliability and availability of the energy storage converter are improved. Even if the main energy storage component fails, the backup energy storage component can take over seamlessly to ensure that the system continues to operate unaffected. Such a design is particularly suitable for critical places and important facilities, such as hospitals, data centers, and military bases, which have extremely high requirements for the continuity and stability of power supply. Through the main-standby switching mechanism, not only can the downtime be reduced, but the overall robustness of the system can also be improved, making it more calm in the face of emergencies.

[0087] Example 7

[0088] The difference between this embodiment and the above embodiment is that a remote monitoring and management system is added. Through the network communication module, the data of the energy storage converter can be uploaded to the cloud server in real time, and the user can access the cloud platform through a mobile terminal or computer to view the operating status, historical records and alarm information of the energy storage converter. The remote monitoring and management system can greatly improve the operation and maintenance efficiency and facilitate troubleshooting and the formulation of maintenance plans.

[0089] Specifically, the network communication module can use Wi-Fi, 4G / 5G cellular network or fiber optic communication to achieve high-speed data transmission. The cloud platform can process and analyze the collected data in real time based on cloud computing technology and big data analysis algorithms to generate intuitive charts and reports. Users can access the cloud platform through a web browser or a dedicated APP to keep abreast of various indicators of the energy storage inverter, such as charge and discharge capacity, temperature, voltage, current, etc. The cloud platform can also provide an early warning function. When an abnormal situation is detected, it will notify the user immediately and remind him to take necessary measures.

[0090] To ensure data security and privacy, the cloud platform uses multiple encryption technologies and firewall protection measures. All data will be encrypted during transmission, and only authorized users can decrypt and read it. In addition, the cloud platform will regularly back up data to prevent accidental loss. Users can also set permission management, allowing multiple users to jointly manage and monitor the same energy storage inverter, facilitating team collaboration.

[0091] The implementation principle of this embodiment is: through the remote monitoring and management system, the intelligent management and maintenance of the energy storage inverter is realized. Users can understand the operating status of the equipment without going to the site, which greatly saves time and labor costs. At the same time, the advanced data analysis function of the cloud platform can help users better understand the performance bottlenecks and potential risks of the equipment and prevent failures in advance. This design not only improves the user experience, but also provides strong support for the long-term stable operation of the energy storage inverter.

[0092] Example 8

[0093] like Figure 2 As shown, the present application also provides an energy storage converter control method, which is applied to the aforementioned energy storage converter, and includes the following steps:

[0094] S1, the control circuit obtains the working mode of the energy storage converter;

[0095] S2, the control circuit adjusts the working state of multiple energy storage components according to the working mode of the energy storage converter:

[0096] When the energy storage converter is connected to the grid for charging, the control circuit controls the first switch 1 and the second switch 2 to be closed, and the third switch 3 to be opened, and the first power module converts the AC power of the external grid into DC power to charge the multiple charging and discharging modules;

[0097] When the energy storage converter is connected to the grid for discharging, the control circuit controls the first switch 1 and the second switch 2 to be closed, and the third switch 3 to be opened, and the first power module converts the DC power of the charging and discharging module into AC power to feed back to the external grid;

[0098] S3, when the energy storage converter is connected to the grid for discharging, the control circuit controls the first switch 1 to close, selects at least two adjacent charging and discharging modules to be connected in parallel to form a charging and discharging assembly, at which time the third switch 3 between the charging and discharging modules in the charging and discharging assembly is closed, and only one of the second switches 2 corresponding to the charging and discharging assembly is closed.

[0099] The implementation principle of this embodiment is: through the intelligent control circuit, the energy storage converter can be flexibly switched between different working modes. The control circuit can accurately control the state of each switch according to the actual needs of the energy storage converter to ensure efficient and safe energy conversion during grid-connected charging and discharging. This method not only improves the operating efficiency of the energy storage converter, but also reduces energy consumption and extends the service life of the equipment.

[0100] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the embodiments shown and described herein.

Claims

1. An energy storage converter, characterized in that: include: A plurality of energy storage components, wherein the energy storage components include a charge-discharge module, a first power module, a filter and a transformer, wherein the charge-discharge module is electrically connected to the first power module and a first switch is provided on a connection line between the two, the first power module is electrically connected to the filter and a second switch is provided on a connection line between the two, the filter is electrically connected to the transformer, the transformer is electrically connected to an external network, and adjacent first power modules are electrically connected and a third switch is provided on a connection line between the two; A control circuit, wherein the first power module, the first switch, the second switch and the third switch are electrically connected to the control circuit respectively.

2. An energy storage converter as claimed in claim 1, characterized in that: The first power module is a bidirectional DC / AC converter.

3. The energy storage converter according to claim 1, characterized in that: The energy storage component also includes: A second power module, which is electrically connected to the charging and discharging module; A power generation unit is electrically connected to the second power module.

4. An energy storage converter as claimed in claim 3, characterized in that: The second power module is a DC / DC converter.

5. The energy storage converter according to claim 3, characterized in that: The power generation unit is a new energy power generation device.

6. The energy storage converter according to claim 3, characterized in that: A fourth switch is provided on the connection line between the charging and discharging module and the second power module, and the fourth switch is electrically connected to the control circuit.

7. The energy storage converter according to claim 1, characterized in that: Also includes: A temperature acquisition module is electrically connected to the plurality of charging and discharging modules respectively to acquire the electrical temperature of the temperature acquisition module. The temperature acquisition module is electrically connected to the control circuit.

8. An energy storage converter as claimed in claim 7, characterized in that: The temperature acquisition module includes a plurality of temperature sensors, the number of the temperature sensors is equal to and corresponds to the charge and discharge modules, and the temperature sensors are used to acquire the temperature of the corresponding charge and discharge modules.

9. A method for controlling an energy storage converter, using the energy storage converter according to any one of claims 1 to 8, characterized in that: The following steps are involved: The control circuit obtains the working mode of the energy storage converter; The control circuit adjusts the working states of the multiple groups of energy storage components according to the working mode of the energy storage converter: When the energy storage converter is connected to the grid for charging, the control circuit controls the first switch and the second switch to be closed, and the third switch to be opened, and the first power module converts the AC power of the external grid into DC power to charge the multiple charging and discharging modules; When the energy storage converter is connected to the grid for discharging, the control circuit controls the first switch and the second switch to be closed, and the third switch to be opened, and the first power module converts the DC power of the charging and discharging module into AC power to feed back to the external grid.

10. The energy storage converter control method according to claim 9, characterized in that: Also includes: When the energy storage inverter is connected to the grid for discharging, the control circuit controls the first switch to close, selects at least two adjacent charging and discharging modules to be connected in parallel to form a charging and discharging assembly, at which time the third switch between the charging and discharging modules in the charging and discharging assembly is closed, and only one of the second switches corresponding to the charging and discharging assembly is closed.

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