Energy management system and method based on bidirectional energy storage converter

Abstract

The invention discloses an energy management system and method based on a bidirectional energy storage converter, and relates to the technical field of energy management, the system comprises a bidirectional energy storage converter module, an energy management control module, an energy storage battery management module, a user visualization module, a comprehensive interface module and a fault diagnosis module; the bidirectional energy storage converter module realizes bidirectional electric energy flow; the energy management control module is used for energy management and scheduling; the energy storage battery management module monitors the state of the battery in real time; the comprehensive interface module completes data exchange and power transmission among the modules through a communication protocol; the fault diagnosis module sends a fault alarm and records fault information; and the user visualization module provides an interface for parameter setting, debugging, startup and shutdown and load scheduling operation. Through modular design, the system can be flexibly expanded according to actual requirements, and fault diagnosis and automatic repair are integrated.

Description

Technical Field

[0001] The present invention relates to the technical field of energy management, and in particular to an energy management system and method based on a bidirectional energy storage converter. Background Art

[0002] With the development of renewable energy and the increasing application of distributed power generation technology, off-grid energy storage systems have gradually become one of the important means to solve the electricity demand in remote areas. However, existing off-grid energy storage systems are often limited by the capacity of a single energy storage inverter and are difficult to adapt to changes in large-scale electricity demand, especially when faced with sudden high-load demands. The stability and reliability of the system face severe tests. In addition, traditional systems lack intelligent management and fault self-recovery functions, resulting in high operation and maintenance costs and poor user experience.

[0003] The current solutions mainly include fixed-threshold power monitoring systems, rule-based fault identification mechanisms, and simple remote control interfaces. Although these traditional methods can meet basic needs to a certain extent, they generally have problems such as slow response speed and low intelligence. For example, a fixed-threshold power monitoring system can only passively wait for power demand to exceed the preset value before responding, and cannot predict or adapt to changes in power demand in advance. The rule-based fault identification mechanism lacks self-learning capabilities and is difficult to cope with complex and changing working environments. The simple remote control interface cannot provide comprehensive status information, which limits the user's decision-making efficiency.

[0004] The existing bidirectional energy storage converter control systems generally have problems such as low intelligence level, slow response speed, and inaccurate fault diagnosis, which lead to unstable overall system performance and poor user experience. Summary of the invention

[0005] The object of the present invention is to provide an energy management system and method based on a bidirectional energy storage converter to solve the problems raised in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions: an energy management system based on a bidirectional energy storage converter, the system comprising a bidirectional energy storage converter module, an energy management control module, an energy storage battery management module, a user visualization module, an integrated interface module and a fault diagnosis module;

[0007] The bidirectional energy storage converter module receives external electric energy and stores it in the energy storage battery in the off-grid or grid-connected operation mode, and can also provide the electric energy in the energy storage battery to the external load or the grid, thereby realizing bidirectional electric energy flow;

[0008] The energy management control module is used for energy management and scheduling, and real-time monitoring of the charge and discharge status, load conditions, power generation and energy storage status of the energy storage battery;

[0009] The energy storage battery management module is used to monitor the voltage, temperature, and charge and discharge status of the battery in real time to ensure that the energy storage battery operates within a safe working range;

[0010] The integrated interface module completes data exchange and power transmission between modules through communication protocols;

[0011] The fault diagnosis module, when detecting a system fault, sends a fault alarm to the user visualization module; analyzes the cause and location of the fault, records all fault information, and generates a fault log;

[0012] The user visualization module is used to provide an interface for parameter setting, debugging, power on / off and load scheduling operations; when a fault alarm sent by the fault diagnosis module is received, the cause and location of the fault are displayed.

[0013] According to the above scheme, the bidirectional energy storage converter module includes a DC circuit, an inverter circuit and an AC circuit;

[0014] The DC circuit includes a DC fuse, a high-voltage DC relay and a pre-charging circuit; the DC fuse is used to prevent the current from damaging the circuit, the high-voltage DC relay is used to control the on-off between the DC power supply and the inverter, and the pre-charging circuit is used to slowly charge the filter capacitor to avoid large current shocks;

[0015] The inverter circuit includes an inverter and an LCL filter; the inverter is used to convert a DC voltage into an AC voltage; the LCL filter is used to filter out high-order harmonics and improve the output waveform quality;

[0016] The AC circuit includes an AC relay and an AC fuse; the AC relay is used to control the on and off of the AC output, and the AC fuse is used to prevent overcurrent from damaging the circuit.

[0017] According to the above scheme, the grid connection includes single-machine grid connection and multi-machine grid connection;

[0018] The single-machine grid connection uses a single bidirectional energy storage converter module to complete peak shaving and valley filling, and balance power demand and supply; the peak shaving and valley filling, when the grid demand is low, obtains electric energy from the grid, and converts the electric energy obtained from the grid into direct current through the bidirectional energy storage converter module and stores it in the energy storage battery; when the grid demand is peak, the electric energy stored in the energy storage battery is converted into alternating current through the bidirectional energy storage converter module, and sent back to the grid, thereby alleviating the grid load and avoiding grid overload or power shortage;

[0019] The multi-machine grid connection uses multiple bidirectional energy storage converter modules to complete a wider range of power dispatching and peak shaving.

[0020] Grid connection also includes wind, solar and storage grid-connected power generation, which is to combine the bidirectional energy storage inverter module with the wind and solar power generation systems to form a mode of stable input of renewable energy to enhance the stability of the power grid; wind and solar power generation are volatile and the power output is unstable; by introducing the bidirectional energy storage inverter module, the energy storage battery can absorb and store this unstable electric energy, thereby smoothly regulating the fluctuations of wind or solar power generation, regulating the flow of electricity, and ensuring the smooth grid connection of wind and solar power;

[0021] When wind or solar power generation is in excess, the energy storage batteries store excess electricity; when wind or solar power generation is insufficient, the electricity stored in the storage batteries is released to the power grid to ensure stable operation of the power grid.

[0022] According to the above scheme, two bidirectional energy storage converter modules are combined to form an off-grid energy storage bidirectional conversion and capacity expansion module; the off-grid energy storage bidirectional conversion and capacity expansion module, based on the bidirectional energy storage converter module, realizes power doubling through parallel operation, thereby supporting higher load requirements; multiple off-grid energy storage bidirectional conversion and capacity expansion modules are operated in parallel to further add power and meet the requirements of larger-scale loads.

[0023] According to the above scheme, the integrated interface module includes RS485 interface, Ethernet interface, CAN interface and USB interface; the communication protocol includes Modbus RTU, Modbus TCP / IP and CAN 2.0;

[0024] The integrated interface module includes an open interface to support future system expansion or integration with other systems; the integrated interface module can convert between different communication protocols to ensure that modules from different manufacturers or different technical standards can communicate effectively.

[0025] According to the above scheme, the fault alarm includes AC bus overvoltage or undervoltage, AC bus overfrequency or underfrequency, AC overvoltage, grid undervoltage, overfrequency or underfrequency, DC bus overvoltage or undervoltage, low battery energy and parameter mismatch;

[0026] According to different types of fault alarms, complete fault alarm clearing, the fault alarm clearing method includes automatic clearing, manual clearing and power off;

[0027] The automatic clearing function automatically clears the fault and restores normal operation when a recoverable fault occurs. The manual clearing function requires manual elimination of the fault and sends an alarm clearing command when a non-automatic recoverable fault occurs. The power off function requires turning off the power and restarting the power supply after the fault alarm disappears.

[0028] According to the above scheme, the parameters include operating mode, AC bus voltage, AC grid voltage, grid frequency, DC bus voltage, battery voltage, battery temperature and battery charge and discharge status;

[0029] Through parameter setting and debugging, operation mode switching, voltage regulation, battery management, fault clearing, alarm threshold setting and optimized load scheduling are completed.

[0030] An energy management method based on a bidirectional energy storage converter, the method comprising the steps of:

[0031] S1. Monitor the bidirectional energy storage converter and energy storage battery to determine whether they are within the safe working range, detect the power demand of the power grid or load, and determine the working mode;

[0032] S2: According to the power demand fluctuation of the power grid or load, the bidirectional energy storage converter and the energy storage battery are coordinated to achieve the function of peak load regulation and frequency regulation;

[0033] S3. Real-time monitoring of the equipment's operating status, automatic detection of faults, and sending alarms; automatic fault clearing or prompts for manual clearing according to the fault type, and recording fault logs;

[0034] S4. The user debugs the bidirectional energy storage converter individually through the visualization module, reads the operating status and alarm information of the bidirectional energy storage converter, and performs parameter setting, operation, and power on / off control.

[0035] According to the above scheme, the safe working range includes the voltage, temperature and charge and discharge state of the energy storage battery and the output power and converter temperature of the bidirectional energy storage converter are kept within the specified safety range; lithium batteries usually require a voltage between 3.0V and 4.2V, exceeding this range may damage the battery; the operating temperature of lithium batteries should usually be kept between -10℃ and 60℃; overcharging or over-discharging of the battery may affect its safety and life; the rated power of the converter is 100kW, but if the load is too large, it may cause the equipment to overload and trigger protection; the normal operating temperature of the converter is usually between -20℃ and 60℃, exceeding this range may cause overtemperature protection;

[0036] The working mode includes a grid-connected mode and an off-grid mode; when the grid demand is stable and can carry more loads, the current working mode is judged to be a grid-connected mode; when the grid is unavailable, the current working mode is judged to be an off-grid mode;

[0037] The off-grid mode can be operated in single-machine and parallel working modes, and in the parallel working mode, multiple bidirectional energy storage converters automatically and evenly distribute the load output.

[0038] According to the above scheme, in the peak load regulation, when the grid load is low, the grid converts the electric energy into direct current through the bidirectional energy storage converter and stores it in the energy storage battery; when the grid load is peak, the energy storage battery converts the stored electric energy into alternating current through the bidirectional energy storage converter and transmits it to the grid, thereby filling the power supply gap in the grid and alleviating the load pressure;

[0039] The frequency modulation is that when the grid frequency is lower than the normal value, the energy storage battery will release the stored electric energy to the grid through the bidirectional energy storage inverter, provide additional power to support the grid, and help the frequency rise to the normal range; when the grid frequency is higher than the normal value, the energy storage battery absorbs the excess electric energy of the grid through the bidirectional energy storage inverter and stores it, helping to reduce the frequency to the normal range.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] 1. The present invention improves the maximum output power of the off-grid energy storage system, and through modular design, the system can be flexibly expanded according to actual needs;

[0042] 2. The present invention realizes intelligent perception and rapid response to both sides of power supply and demand, greatly improves energy conversion efficiency, and reduces the occurrence of energy waste;

[0043] 3. The integrated fault diagnosis and automatic repair mechanism effectively reduces human intervention, reduces the frequency and difficulty of maintenance, and extends the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A flow chart of the steps of an energy management method based on a bidirectional energy storage converter according to the present invention;

[0045] Figure 2 It is a structural schematic diagram of a bidirectional energy storage converter module of an energy management system based on a bidirectional energy storage converter according to the present invention;

[0046] Figure 3 It is a structural schematic diagram of an application scenario of an off-grid energy storage bidirectional conversion capacity expansion module of an energy management system based on a bidirectional energy storage converter according to the present invention;

[0047] Figure 4 This is a structural diagram of the parallel operation of five off-grid energy storage bidirectional converter modules. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] Example: Figure 1-Figure 4 As shown, the present invention provides a technical solution, an energy management system based on a bidirectional energy storage converter; the system includes a bidirectional energy storage converter module, an energy management control module, an energy storage battery management module, a user visualization module, an integrated interface module and a fault diagnosis module;

[0050] The bidirectional energy storage converter module receives external electric energy and stores it in the energy storage battery in an off-grid or grid-connected operation mode, and can also provide the electric energy in the energy storage battery to an external load or a power grid to realize bidirectional electric energy flow; the bidirectional energy storage converter module includes a DC circuit, an inverter circuit and an AC circuit; the DC circuit includes a DC fuse, a high-voltage DC relay and a pre-charging circuit; the DC fuse is used to prevent the current from damaging the circuit, the high-voltage DC relay is used to control the on and off between the DC power supply and the inverter, and the pre-charging circuit is used to slowly charge the filter capacitor to avoid large current shocks; the inverter circuit includes an inverter and an LCL filter; the inverter is used to convert the DC voltage into an AC voltage; the LCL filter is used to filter out high-order harmonics and improve the output waveform quality; the AC circuit includes an AC relay and an AC fuse; the AC relay is used to control the on and off of the AC output, and the AC fuse is used to prevent overcurrent from damaging the circuit;

[0051] When the grid load is low, the grid converts the electric energy into direct current through the bidirectional energy storage converter module and stores it in the energy storage battery. When the grid load is peak, the energy storage battery converts the stored electric energy into alternating current through the bidirectional energy storage converter module and transmits it to the grid, thus filling the power supply gap in the grid and alleviating the load pressure.

[0052] When the grid frequency is lower than normal, the energy storage battery will release the stored electric energy to the grid through the bidirectional energy storage converter module, providing additional power to support the grid and help the frequency rise to the normal range; when the grid frequency is higher than normal, the energy storage battery will absorb the excess electric energy of the grid through the bidirectional energy storage converter module and store it, helping to reduce the frequency to the normal range;

[0053] During the process of energy storage battery power generation or energy storage, the energy storage battery management module monitors the status of the energy storage battery in real time to ensure that the energy storage battery operates within a safe range and does not over-discharge.

[0054] The energy management control module is used for energy management and scheduling, and real-time monitoring of the charge and discharge status, load conditions, power generation and energy storage status of the energy storage battery;

[0055] The energy storage battery management module is used to monitor the voltage, temperature, and charge and discharge status of the battery in real time to ensure that the energy storage battery operates within a safe working range;

[0056] The integrated interface module completes data exchange and power transmission between modules through communication protocols; the integrated interface module includes RS485 interface, Ethernet interface, CAN interface and USB interface; the communication protocols include Modbus RTU, Modbus TCP / IP and CAN 2.0; the integrated interface module includes an open interface to support future system expansion or integration with other systems; the integrated interface module can convert between different communication protocols to ensure that modules from different manufacturers or different technical standards can communicate effectively.

[0057] The fault diagnosis module, when detecting a system fault, sends a fault alarm to the user visualization module; analyzes the cause and location of the fault, records all fault information, and generates a fault log; the fault alarms include AC bus overvoltage or undervoltage, AC bus overfrequency or underfrequency, AC overvoltage, grid undervoltage, overfrequency or underfrequency, DC bus overvoltage or undervoltage, low battery energy and parameter mismatch; according to different types of fault alarms, the fault alarm clearing is completed, and the fault alarm clearing methods include automatic clearing, manual clearing and power off; the automatic clearing, when a recoverable fault occurs, automatically clears the fault and restores normal operation; the manual clearing, when a fault that cannot be automatically recovered occurs, requires manual elimination of the fault and sends an alarm clearing command; the power off, when the fault alarm disappears, requires turning off the power and restarting.

[0058] The user visualization module is used to provide an interface for parameter setting, debugging, power on / off and load scheduling operations; when a fault alarm sent by the fault diagnosis module is received, the cause and location of the fault are displayed; the parameters include working mode, AC bus voltage, AC grid voltage, grid frequency, DC bus voltage, battery voltage, battery temperature and battery charging and discharging status; through parameter setting and debugging, operation mode switching, voltage regulation, battery management, fault clearing, alarm threshold setting and optimized load scheduling are completed.

[0059] The present invention provides another technical solution, an off-grid energy storage bidirectional current conversion capacity expansion module, such as Figure 3As shown, the application scenario of the off-grid energy storage bidirectional conversion and capacity expansion module includes a bidirectional energy storage converter module PCS1, a bidirectional energy storage converter module PCS2, a battery LFP PACK, an energy management control module EMS, an energy storage battery management module BMS, a CAN data bus, a switch K1, a switch K2, an inductor L1, and an inductor L2;

[0060] The bidirectional energy storage converter module PCS1 and the bidirectional energy storage converter module PCS2 receive external electric energy and store it in the battery LFP PACK, and can also provide the electric energy in the battery LFP PACK to an external load or a power grid, thereby realizing a bidirectional electric energy flow;

[0061] The CAN data bus connects the bidirectional energy storage converter module and the energy management control module to achieve data exchange and control;

[0062] The switch K1 and the switch K2 respectively control the connection of the bidirectional energy storage converter module PCS1 and the bidirectional energy storage converter module PCS2;

[0063] Inductor L1 and inductor L2 are connected in series between switch K1 and switch K2 and bidirectional energy storage converter module PCS1 and bidirectional energy storage converter module PCS2, and electrical isolation improves circuit safety;

[0064] When the grid demand is low, the energy management control module EMS controls the bidirectional energy storage converter module PCS1 and the bidirectional energy storage converter module PCS2 to convert electrical energy into chemical energy and store it in the battery LFP PACK;

[0065] When the grid demand is at its peak, the energy management control module EMS controls the bidirectional energy storage converter module PCS1 and the bidirectional energy storage converter module PCS2 to convert the chemical energy in the battery LFP PACK into electrical energy and supply it to the grid, thereby alleviating the grid load and avoiding grid overload or power shortage.

[0066] During the process of power generation or energy storage of the battery LFP PACK, the energy storage battery management module BMS monitors the status of the battery LFP PACK in real time to ensure that the battery LFP PACK works within a safe range and does not over-discharge;

[0067] The bidirectional energy storage converter module PCS1 and the bidirectional energy storage converter module PCS2 work in parallel and jointly undertake the tasks of energy storage and discharge. The energy management control module EMS will dynamically adjust the working status of the bidirectional energy storage converter module PCS1 and the bidirectional energy storage converter module PCS2 according to actual conditions and allocate tasks in the best way.

[0068] The present invention provides another technical solution, when the maximum load demand exceeds 460KW, multiple off-grid energy storage bidirectional current conversion capacity expansion modules and a 260KW generator set are selected for parallel operation;

[0069] The power of a single off-grid energy storage bidirectional conversion capacity expansion module is 200KW; assuming that the maximum load demand in the industrial zone is 1200KW; to meet this demand, it is necessary to use 5 off-grid energy storage bidirectional conversion capacity expansion modules and a generator set in parallel, such as Figure 4 As shown;

[0070] The power of the generator set is 260KW, and the power of the five off-grid energy storage bidirectional conversion capacity expansion modules is 5×200=1000KW, which can provide a total of 1260KW of electricity, enough to meet the load demand of 1200KW;

[0071] The energy management control module EMS intelligently manages the power from the off-grid energy storage bidirectional conversion capacity expansion module and the generator set to ensure that the load demand can be met at any time; and according to the actual changes in the load, the energy management control module EMS dynamically adjusts the output of each module and the generator to maintain stable operation;

[0072] As mentioned above, other high-power application combinations can be deduced in the same way.

[0073] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. An energy management system based on a bidirectional energy storage converter, characterized in that: The system includes a bidirectional energy storage converter module, an energy management control module, an energy storage battery management module, a user visualization module, an integrated interface module and a fault diagnosis module; The bidirectional energy storage converter module receives external electric energy and stores it in the energy storage battery in the off-grid or grid-connected operation mode, and can also provide the electric energy in the energy storage battery to the external load or the grid, thereby realizing bidirectional electric energy flow; The energy management control module is used for energy management and scheduling, and real-time monitoring of the charge and discharge status, load conditions, power generation and energy storage status of the energy storage battery; The energy storage battery management module is used to monitor the voltage, temperature, and charge and discharge status of the battery in real time to ensure that the energy storage battery operates within a safe working range; The integrated interface module completes data exchange and power transmission between modules through communication protocols; The fault diagnosis module, when detecting a system fault, sends a fault alarm to the user visualization module; analyzes the cause and location of the fault, records all fault information, and generates a fault log; The user visualization module is used to provide an interface for parameter setting, debugging, power on / off and load scheduling operations; when a fault alarm sent by the fault diagnosis module is received, the cause and location of the fault are displayed.

2. The energy management system based on the bidirectional energy storage converter according to claim 1 is characterized in that: The bidirectional energy storage converter module includes a DC circuit, an inverter circuit and an AC circuit; The DC circuit includes a DC fuse, a high-voltage DC relay and a pre-charging circuit; the DC fuse is used to prevent the current from damaging the circuit, the high-voltage DC relay is used to control the on-off between the DC power supply and the inverter, and the pre-charging circuit is used to slowly charge the filter capacitor to avoid large current impact; The inverter circuit includes an inverter and an LCL filter; the inverter is used to convert a DC voltage into an AC voltage; the LCL filter is used to filter out high-order harmonics and improve the output waveform quality; The AC circuit includes an AC relay and an AC fuse; the AC relay is used to control the on and off of the AC output, and the AC fuse is used to prevent overcurrent from damaging the circuit.

3. The energy management system based on the bidirectional energy storage converter according to claim 2 is characterized in that: The grid connection includes single-machine grid connection and multi-machine grid connection; The single-machine grid connection uses a single bidirectional energy storage converter module to complete peak shaving and valley filling, and balance power demand and supply; the peak shaving and valley filling, when the grid demand is low, obtains electric energy from the grid, and converts the electric energy obtained from the grid into direct current through the bidirectional energy storage converter module and stores it in the energy storage battery; when the grid demand is peak, the electric energy stored in the energy storage battery is converted into alternating current through the bidirectional energy storage converter module, and sent back to the grid, thereby alleviating the grid load and avoiding grid overload or power shortage; The multi-machine grid connection uses multiple bidirectional energy storage converter modules to complete a wider range of power dispatching and peak shaving.

4. The energy management system and method based on a bidirectional energy storage converter according to claim 3 is characterized in that: Two bidirectional energy storage converter modules are combined to form an off-grid energy storage bidirectional conversion and capacity expansion module; the off-grid energy storage bidirectional conversion and capacity expansion module, based on the bidirectional energy storage converter module, realizes power doubling through parallel operation, thereby supporting higher load requirements; multiple off-grid energy storage bidirectional conversion and capacity expansion modules are operated in parallel to further add power and meet the requirements of larger-scale loads.

5. The energy management system based on a bidirectional energy storage converter according to claim 1, characterized in that: The integrated interface module includes an RS485 interface, an Ethernet interface, a CAN interface and a USB interface; the communication protocols include Modbus RTU, Modbus TCP / IP and CAN 2.0; The comprehensive interface module includes an open interface to support future system expansion or integration with other systems.

6. The energy management system based on a bidirectional energy storage converter according to claim 1, characterized in that: The fault alarms include AC bus overvoltage or undervoltage, AC bus overfrequency or underfrequency, AC overvoltage, grid undervoltage, overfrequency or underfrequency, DC bus overvoltage or undervoltage, low battery energy and parameter mismatch; According to different types of fault alarms, complete fault alarm clearing, the fault alarm clearing method includes automatic clearing, manual clearing and power off; The automatic clearing function automatically clears the fault and restores normal operation when a recoverable fault occurs. The manual clearing function requires manual elimination of the fault and sends an alarm clearing command when a non-automatic recoverable fault occurs. The power off function requires turning off the power and restarting the power supply after the fault alarm disappears.

7. The energy management system based on a bidirectional energy storage converter according to claim 1, characterized in that: The parameters include operating mode, AC bus voltage, AC grid voltage, grid frequency, DC bus voltage, battery voltage, battery temperature and battery charge and discharge status; Through parameter setting and debugging, operation mode switching, voltage regulation, battery management, fault clearing, alarm threshold setting and optimized load scheduling are completed.

8. An energy management method based on a bidirectional energy storage converter, characterized in that: The method comprises the steps of: S1. Monitor the bidirectional energy storage converter and energy storage battery to determine whether they are within the safe working range, detect the power demand of the power grid or load, and determine the working mode; S2: According to the power demand fluctuation of the power grid or load, the bidirectional energy storage converter and the energy storage battery are coordinated to achieve the function of peak load regulation and frequency regulation; S3. Real-time monitoring of the equipment's operating status, automatic detection of faults, and sending alarms; automatic fault clearing or prompts for manual clearing according to the fault type, and recording fault logs; S4. The user debugs the bidirectional energy storage converter individually through the visualization module, reads the operating status and alarm information of the bidirectional energy storage converter, and performs parameter setting, operation, and power on / off control.

9. The energy management method based on the bidirectional energy storage converter according to claim 7 is characterized in that: The safe operating range includes the voltage, temperature and charge / discharge state of the energy storage battery and the output power and converter temperature of the bidirectional energy storage converter being within the specified safe range; The working mode includes a grid-connected mode and an off-grid mode; when the grid demand is stable and can carry more loads, the current working mode is judged to be a grid-connected mode; when the grid is unavailable, the current working mode is judged to be an off-grid mode; The off-grid mode can be operated in single-machine and parallel working modes, and in the parallel working mode, multiple bidirectional energy storage converters automatically and evenly distribute the load output.

10. The energy management method based on the bidirectional energy storage converter according to claim 7, characterized in that: The peak load regulation is that when the load of the power grid is low, the power grid converts the electric energy into direct current through the bidirectional energy storage converter and stores it in the energy storage battery; when the load of the power grid is peak, the energy storage battery converts the stored electric energy into alternating current through the bidirectional energy storage converter and transmits it to the power grid, thereby filling the power supply gap in the power grid and alleviating the load pressure; The frequency modulation is that when the grid frequency is lower than the normal value, the energy storage battery will release the stored electric energy to the grid through the bidirectional energy storage inverter, provide additional power to support the grid, and help the frequency rise to the normal range; when the grid frequency is higher than the normal value, the energy storage battery absorbs the excess electric energy of the grid through the bidirectional energy storage inverter and stores it, helping to reduce the frequency to the normal range.

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