A hybrid energy storage converter and energy management method thereof

Abstract

The application provides a hybrid energy storage type converter and an energy management method thereof, which comprises collecting voltages and currents of two traction power supply arms alpha and beta, and calculating load powers P La and P Lb of the two traction power supply arms; defining a running interval according to the load powers P La and P Lb , and calculating state of charges SOC Sc of a super capacitor and state of charges SOC Ba of a battery; determining charging and discharging management of the super capacitor and the battery according to the running interval, the calculated state of charges SOC Sc and SOC Ba ; by setting scheduling priorities of the two, balance between fast charging and discharging and energy storage is achieved; energy between the traction power supply arms and the energy storage units can be effectively allocated, and power quality can be effectively improved; in addition, in the braking process, energy generated by braking is preferentially used, and energy utilization rate of the traction power supply system is improved, and operation cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power electronic power supply system power regulator, and particularly relates to a hybrid energy storage type converter and an energy management method thereof. BACKGROUND

[0002] High-speed railway and urban rail transit system are widely used in the world, as an efficient and environmentally friendly transportation mode, the performance of its power system directly affects the operation efficiency and energy consumption level. When the train brakes, especially in some long downhill sections in China, the energy generated by braking is considerable. The existing single-phase power supply system directly recovers energy through the traction power supply arm, which causes the problem of negative sequence and harmonic of three-phase traction network, and the recovery through the braking resistor also causes energy waste, and the overheat of the braking resistor also needs to increase additional heat dissipation device. The existing power regulator is connected to the system through a back-to-back converter, and a storage battery or super capacitor is connected across the DC bus. However, this structure needs to be equipped with a heavy step-down transformer on the AC side of the back-to-back converter, and the volume, weight and efficiency of the system are reduced. In addition, the centralized energy storage configuration needs longer charging and discharging time, which is difficult to meet the requirements of rapid response in sensitive occasions.

[0003] In addition, the high-speed railway traction load has the characteristics of randomness and volatility, and the characteristics of the energy feedback storage medium also need to be fully considered. The super capacitor has low energy density, high power density, and the charging and discharging frequency is up to one million times, which is suitable for short-term energy storage and release; the battery has high energy density, but its power density is low, the energy release speed is slow, and the charging and discharging life is limited. Based on the randomness and volatility of the railway traction load, the charging and discharging rate and the charging and discharging life of the two kinds of energy storage media are significantly different, and how to develop a reasonable energy management method is related to not only the operation stability of the system but also the service life of the system;

[0004] Therefore, how to realize energy recovery of the traction system based on the power regulator and suppress the voltage fluctuation of the power grid, and how to develop a reasonable energy management method for the hybrid energy storage type converter to take into account the characteristics of different energy storage elements and improve the reliability of the system are urgent problems to be solved. SUMMARY

[0005] In view of the deficiencies of the prior art, the technical problem to be solved by the present application is to provide a hybrid energy storage type converter and an energy management method thereof, which can effectively improve the power quality and improve the energy utilization rate of the traction power supply system and reduce the operation cost.

[0006] The present application provides a hybrid energy storage type converter energy management method, which adopts the following steps:

[0007] Step 1: Collect the voltage and current of the traction power supply arms α and β on both sides, and calculate the load power P of the two traction power supply arms La and P Lb ;

[0008] Step 2: According to the load power P La and P Lb Define and divide the operating range and calculate the state of charge (SOC) of the supercapacitor Sc and the battery's state of charge (SOC) Ba ;

[0009] Step 3: Based on the operating range, calculate the state of charge SOC Sc and SOC Ba The values ​​jointly determine the charge and discharge management of the supercapacitor and battery.

[0010] Preferably, in step 2, the load power P La and P Lb Define and divide the operating range, including:

[0011] 1) When P La >0 and P Lb When >0, both traction power supply arms are working in the traction state, which is defined as the operation range A;

[0012] 2) When P La >0,P Lb <0 and |P La |>|P Lb |, the traction power supply arm α works in the traction state, the traction power supply arm β works in the braking state, and the traction consumption is greater than the braking energy. This state is defined as the operation range B;

[0013] 3) When P La >0,P Lb <0 and |P La |<|P Lb |, the traction power supply arm α works in the traction state, the traction power supply arm β works in the braking state, and the traction consumption is less than the braking energy. This state is defined as the operation range C;

[0014] 4) When P La <0, P Lb >0 and |P La |<|P Lb |, the traction power supply arm α works in the braking state, the traction power supply arm β works in the traction state, and the traction consumption is greater than the braking energy. This state is defined as the operation range D;

[0015] 5) When P La <0, P Lb >0 and |PLa |>|P Lb |, the traction power supply arm α works in the braking state, the traction power supply arm β works in the traction state, and the traction consumption is less than the braking energy. This state is defined as the operation interval E;

[0016] 6) When P La <0 and P Lb <0, at this time, the traction power supply arms on both sides are working in the braking state, and this state is defined as the operating range F.

[0017] Preferably, the step 3: according to the operating range, the calculated state of charge SOC Sc and SOC Ba The values ​​jointly determine the charge and discharge management of the supercapacitor and battery, including:

[0018] (1) When the two traction power supply arms are in the operating state of operation range A, they are first discharged through the supercapacitor. When the supercapacitor is in the state of charge SOC Sc <SOC Scmin When the battery is discharged, the SOC Scmin State of charge SOC Sc Minimum set capacity value;

[0019] (2) When the operating state of the two traction power supply arms is in the operating range B, the power generated by the braking of the traction power supply arm β is transferred to the traction power supply arm α through the modular multi-level power regulator, and the power difference of the traction power supply arm α |P La |-|P Lb |, and then discharge the supercapacitor to provide the power difference. When the supercapacitor's state of charge SOC Sc <SOC Scmin When the battery is discharged;

[0020] (3) When the operating state of the two traction power supply arms is in the operating range C, the power generated by the braking of the traction power supply arm β is transferred to the traction power supply arm α through the modular multi-level power regulator, and the power difference generated by the traction power supply arm β |P Lb |-|P La |, based on the generated power difference, the battery is charged first. When the battery state of charge SOC Ba >SOC Bamax When the supercapacitor is charged based on the excess power difference, the switch is switched. When the supercapacitor's state of charge SOC Sc >SOC Scmax When the excess power difference is consumed by the braking resistor; the SOC Bamax State of charge SOC Ba Maximum set capacity value; the SOCScmax State of charge SOC Sc Maximum set capacity value.

[0021] Preferably, the step 3: according to the operating range, the calculated state of charge SOC Sc and SOC Ba The values ​​jointly determine the charge and discharge management of the supercapacitor and battery, including:

[0022] (4) When the operating state of the two traction power supply arms is in the operating range D, the power generated by the braking of the traction power supply arm α is transferred to the traction power supply arm β through the modular multi-level power regulator, and the power difference of the traction power supply arm β is calculated. Lb |-|P La |, and then discharge the supercapacitor to provide the power difference. When the supercapacitor's state of charge SOC Sc <SOC Scmin When the battery is discharged;

[0023] (5) When the operating state of the two traction power supply arms is in the operating range E, the power generated by the braking of the traction power supply arm α is transferred to the traction power supply arm β through the modular multi-level power regulator, and the power difference generated by the traction power supply arm α |P La |-|P Lb |, based on the generated power difference, the battery is charged first. When the battery state of charge SOC Ba >SOC Bamax When the supercapacitor is charged based on the excess power difference, the switch is switched. When the supercapacitor's state of charge SOC Sc >SOC Scmax When the excess power difference is consumed by the braking resistor;

[0024] (6) When the two traction power supply arms are in the operating state of the operating range F, the battery is charged first based on the power generated by the braking of the traction power supply arm α and the traction power supply arm α. When the battery state of charge SOC Ba >SOC Bamax When the supercapacitor is charged based on the excess power difference, the switch is switched. When the supercapacitor's state of charge SOC Sc >SOC Scmax When the braking resistor is turned on, the excess power difference is consumed by the braking resistor.

[0025] The present invention also provides a hybrid energy storage converter, which includes a modular multi-level power conditioner, a cascaded power converter module and a battery; wherein the modular multi-level power conditioner, the cascaded power converter module and the battery are electrically connected in sequence;

[0026] The modular multilevel power regulator comprises an a-phase multilevel converter, a b-phase multilevel converter and a c-phase multilevel converter, wherein the a-phase multilevel converter is connected with a traction power supply arm alpha, the b-phase multilevel converter is connected with a traction power supply arm beta, and the c-phase multilevel converter is connected with a common ground end of a V / v traction transformer; an output end of the modular multilevel power regulator is connected to a cascaded power converter module through a DC bus;

[0027] The cascaded power converter module comprises a plurality of groups of input series-connected active bridges, which are connected in parallel to output a DC / DC on a low-voltage DC bus after voltage regulation and conversion.

[0028] The DC / DC converts voltage again and inputs to a connected battery.

[0029] Preferably, the multilevel converter specifically comprises a half-bridge sub-module, a first capacitor, a first inductor, a Buck-Boost converter and a super capacitor.

[0030] The half-bridge sub-module is electrically connected with the Buck-Boost converter, the first capacitor is connected in series between two output ends of the half-bridge sub-module; the first inductor is connected in series at a first output end of the Buck-Boost converter, and then connected to a first end of the super capacitor; a second output end of the Buck-Boost converter is electrically connected with a second end of the super capacitor.

[0031] Preferably, the power converter module output in parallel adopts an ISOP structure.

[0032] Preferably, the output end of the cascaded power converter module is electrically connected with a braking resistor and a heat dissipation device.

[0033] To solve the above technical problems, the application further provides a hybrid energy storage type converter energy management system, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to realize the hybrid energy storage type converter energy management method.

[0034] To solve the above technical problems, the application further provides a computer readable storage medium comprising a stored computer program, wherein the computer readable storage medium is controlled to realize the hybrid energy storage type converter energy management method when the computer program is executed.

[0035] The application has the following advantages:

[0036] 1. The hybrid energy storage converter utilizes multi-level cascade technology, effectively reducing device costs and eliminating the need for a step-down transformer, significantly reducing system size and weight. Furthermore, by combining the characteristics of supercapacitors and batteries and prioritizing their scheduling, the hybrid energy storage converter achieves a balance between rapid charging and discharging and energy storage.

[0037] 2. The hybrid energy storage converter energy management method of the present invention can effectively distribute the energy between the traction power supply arm and the energy storage unit, and effectively improve the power quality. In addition, during the braking process, the energy generated by braking is used first. When there is surplus energy generated by braking, it can be quickly recovered and stored, and then released during traction, which significantly improves the energy utilization efficiency and the life of the energy storage device. It not only reduces energy waste, but also effectively reduces the operating cost of the train, which is more economical and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A step diagram of the energy management method for a hybrid energy storage converter;

[0039] Figure 2 It is a schematic diagram of the structure of a hybrid energy storage converter;

[0040] Figure 3 This is a schematic diagram of the division of the operating range of the traction power supply arm;

[0041] Figure 4 Schematic diagram of the decomposition of the energy management method of the hybrid energy storage converter. DETAILED DESCRIPTION

[0042] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the following.

[0043] Example 1:

[0044] The present invention provides a hybrid energy storage converter energy management method, such as Figure 1 As shown, the following steps are taken:

[0045] Step 1: Collect the voltage and current of the traction power supply arms α and β on both sides, and calculate the load power P of the two traction power supply arms La and P Lb ;

[0046] Step 2: According to the load power P La and P Lb Define and divide the operating range and calculate the state of charge (SOC) of the supercapacitor Sc and the battery's state of charge (SOC) Ba ;

[0047] Step 3: Based on the operating range, calculate the state of charge SOCSc and SOC Ba The values ​​jointly determine the charge and discharge management of the supercapacitor and battery.

[0048] Preferably, in step 2, the load power P La and P Lb Define the operating interval, such as Figure 3 Shown: Specifically including:

[0049] 1) When P La >0 and P Lb When >0, both traction power supply arms are working in the traction state, which is defined as the operation range A;

[0050] 2) When P La >0,P Lb <0 and |P La |>|P Lb |, the traction power supply arm α works in the traction state, the traction power supply arm β works in the braking state, and the traction consumption is greater than the braking energy. This state is defined as the operation range B;

[0051] 3) When P La >0,P Lb <0 and |P La |<|P Lb |, the traction power supply arm α works in the traction state, the traction power supply arm β works in the braking state, and the traction consumption is less than the braking energy. This state is defined as the operation range C;

[0052] 4) When P La <0, P Lb >0 and |P La |<|P Lb |, the traction power supply arm α works in the braking state, the traction power supply arm β works in the traction state, and the traction consumption is greater than the braking energy. This state is defined as the operation range D;

[0053] 5) When P La <0, P Lb >0 and |P La |>|P Lb |, the traction power supply arm α works in the braking state, the traction power supply arm β works in the traction state, and the traction consumption is less than the braking energy. This state is defined as the operation interval E;

[0054] 6) When P La <0 and P Lb <0, at this time, the traction power supply arms on both sides are working in the braking state, and this state is defined as the operating range F.

[0055] Preferably, the step 3: according to the operating range, the calculated state of charge SOC Sc and SOC Ba The values ​​jointly determine the charge and discharge management of the supercapacitor and battery, such as Figure 4 As shown, specifically including:

[0056] (1) When the two traction power supply arms are in the operating state of operation range A, they are first discharged through the supercapacitor. When the supercapacitor is in the state of charge SOC Sc <SOC Scmin When the battery is discharged, the SOC Scmin State of charge SOC Sc Minimum set capacity value;

[0057] (2) When the operating state of the two traction power supply arms is in the operating range B, the power generated by the braking of the traction power supply arm β is transferred to the traction power supply arm α through the modular multi-level power regulator, and the power difference of the traction power supply arm α |P La |-|P Lb |, and then discharge the supercapacitor to provide the power difference. When the supercapacitor's state of charge SOC Sc <SOC Scmin When the battery is discharged;

[0058] (3) When the operating state of the two traction power supply arms is in the operating range C, the power generated by the braking of the traction power supply arm β is transferred to the traction power supply arm α through the modular multi-level power regulator, and the power difference generated by the traction power supply arm β |P Lb |-|P La |, based on the generated power difference, the battery is charged first. When the battery state of charge SOC Ba >SOC Bamax When the supercapacitor is charged based on the excess power difference, the switch is switched. When the supercapacitor's state of charge SOC Sc >SOC Scmax When the excess power difference is consumed by the braking resistor; the SOC Bamax State of charge SOC Ba Maximum set capacity value; the SOC Scmax State of charge SOC Sc Maximum set capacity value.

[0059] Preferably, the step 3: according to the operating range, the calculated state of charge SOC Sc and SOC Ba The values ​​jointly determine the charge and discharge management of the supercapacitor and battery, including:

[0060] (4) When the operating state of the two traction power supply arms is in the operating range D, the power generated by the braking of the traction power supply arm α is transferred to the traction power supply arm β through the modular multi-level power regulator, and the power difference of the traction power supply arm β is calculated. Lb |-|P La |, and then discharge the supercapacitor to provide the power difference. When the supercapacitor's state of charge SOC Sc <SOC Scmin When the battery is discharged;

[0061] (5) When the operating state of the two traction power supply arms is in the operating range E, the power generated by the braking of the traction power supply arm α is transferred to the traction power supply arm β through the modular multi-level power regulator, and the power difference generated by the traction power supply arm α |P La |-|P Lb |, based on the generated power difference, the battery is charged first. When the battery state of charge SOC Ba >SOC Bamax When the supercapacitor is charged based on the excess power difference, the switch is switched. When the supercapacitor's state of charge SOC Sc >SOC Scmax When the excess power difference is consumed by the braking resistor;

[0062] (6) When the two traction power supply arms are in the operating state of the operating range F, the battery is charged first based on the power generated by the braking of the traction power supply arm α and the traction power supply arm α. When the battery state of charge SOC Ba >SOC Bamax When the supercapacitor is charged based on the excess power difference, the switch is switched. When the supercapacitor's state of charge SOC Sc >SOC Scmax When the braking resistor is turned on, the excess power difference is consumed by the braking resistor.

[0063] Example 2:

[0064] The present invention also provides a hybrid energy storage converter, such as Figure 2 As shown, the hybrid energy storage converter includes a modular multi-level power conditioner, a cascaded power converter module and a battery; wherein the modular multi-level power conditioner, the cascaded power converter module and the battery are electrically connected in sequence;

[0065] The modular multilevel power conditioner includes an a-phase multilevel converter, a b-phase multilevel converter, and a c-phase multilevel converter, wherein the a-phase multilevel converter is connected to the traction power supply arm α, the b-phase multilevel converter is connected to the traction power supply arm β, and the c-phase multilevel converter is connected to the common ground terminal of the V / V traction transformer; the output terminal of the modular multilevel power conditioner is connected to the cascaded power converter module via a DC bus;

[0066] The cascaded power converter module includes multiple sets of active bridges connected in series with inputs, which adjust and transform the voltage and then output it in parallel to the DC / DC on the low-voltage DC bus;

[0067] The DC / DC regulates the voltage again and inputs it to the connected battery.

[0068] Preferably, the multi-level converter specifically includes a half-bridge submodule, a first capacitor, a first inductor, a Buck-Boost converter and a supercapacitor;

[0069] The half-bridge submodule is electrically connected to the Buck-Boost converter, and a first capacitor is connected in series between the two output ends of the half-bridge submodule; the first output end of the Buck-Boost converter is connected in series with a first inductor and then connected to the first end of the supercapacitor; the second output end of the Buck-Boost converter is electrically connected to the second end of the supercapacitor.

[0070] Preferably, the power converter modules are output in parallel using an ISOP structure.

[0071] Preferably, the output end of the cascaded power converter module is electrically connected to a braking resistor and a heat sink.

[0072] Example 3:

[0073] In order to solve the above technical problems, the present invention also provides a hybrid energy storage converter energy management system, including a memory, a processor, and a computer program stored in the memory and runnable on the processor. When the processor executes the computer program, the hybrid energy storage converter energy management method described in the present invention is implemented.

[0074] Example 4:

[0075] In order to solve the above technical problems, the present invention also provides a computer-readable storage medium, including a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute to implement the hybrid energy storage converter energy management method described in the present invention.

[0076] Embodiment 5:

[0077] The present invention also provides a computer program product or computer program, which includes computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the methods provided in the various implementations of the above embodiments.

[0078] The above description is merely a preferred embodiment of the present invention and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of disclosure involved in the present invention is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also includes other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the above-mentioned disclosed concepts. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in the present invention.

Claims

1. A hybrid energy storage converter energy management method, characterized in that: Applicable to hybrid energy storage converter, wherein the hybrid energy storage converter includes a modular multi-level power conditioner, a power converter module with input series and output parallel, a super capacitor and a battery; wherein the modular multi-level power conditioner, the power converter module with input series and output parallel, and the battery are electrically connected in sequence; The modular multilevel power conditioner includes an a-phase multilevel converter, a b-phase multilevel converter, and a c-phase multilevel converter, wherein the a-phase multilevel converter is connected to the traction power supply arm α, the b-phase multilevel converter is connected to the traction power supply arm β, and the c-phase multilevel converter is connected to the common ground terminal of the V / V traction transformer; the output terminal of the modular multilevel power conditioner is connected to the power converter module with input series and output parallel via a DC bus; The power converter module with serial input and parallel output includes multiple sets of active bridges connected in series with input, which adjust and transform the voltage and then output it in parallel to the DC / DC on the low-voltage DC bus; The DC / DC adjusts the voltage again and inputs it into the connected battery; The hybrid energy storage converter energy management method specifically adopts the following steps: Step 1: Collect the voltage and current of the traction power supply arms α and β on both sides, and calculate the load power P of the two traction power supply arms La and P Lb ; Step 2: According to the load power P La and P Lb Define the operating intervals as A, B, C, D, E, and F, and calculate the state of charge (SOC) of the supercapacitor in each interval. Sc and the battery's state of charge (SOC) Ba ; Step 3: According to the operating intervals A, B, C, D, E, F, the state of charge SOC calculated in each interval Sc and SOC Ba The values ​​jointly determine the charge and discharge management of the supercapacitor and battery.

2. The hybrid energy storage converter energy management method according to claim 1, characterized in that: In step 2, the load power P La and P Lb Define and divide the operating range, including: 1) When P La >0 and P Lb >0, at this time, both traction power supply arms on both sides are working in the traction state, which is defined as the operating range A; 2) When P La >0,P Lb <0 and |P La |>|P Lb |, the traction power supply arm α works in the traction state, the traction power supply arm β works in the braking state, and the traction consumption is greater than the braking energy. This state is defined as the operation range B; 3) When P La >0,P Lb <0 and |P La |<|P Lb |, the traction power supply arm α works in the traction state, the traction power supply arm β works in the braking state, and the traction consumption is less than the braking energy. This state is defined as the operation range C; 4) When P La <0, P Lb >0 and |P La |<|P Lb |, the traction power supply arm α works in the braking state, the traction power supply arm β works in the traction state, and the traction consumption is greater than the braking energy. This state is defined as the operation range D; 5) When P La <0, P Lb >0 and |P La |>|P Lb |, the traction power supply arm α works in the braking state, the traction power supply arm β works in the traction state, and the traction consumption is less than the braking energy. This state is defined as the operation interval E; 6) When P La <0 and P Lb <0, at this time, the traction power supply arms on both sides are working in the braking state, and this state is defined as the operating range F.

3. The hybrid energy storage converter energy management method according to claim 2, characterized in that: Step 3: According to the operating range, the calculated state of charge SOC Sc and SOC Ba The values ​​jointly determine the charge and discharge management of the supercapacitor and battery, including: (1) When the two traction power supply arms are in the operating state of operation range A, they are first discharged through the supercapacitor. When the supercapacitor is in the state of charge SOC Sc <SOC Scmin When the battery is discharged, the SOC Scmin State of charge SOC Sc Minimum set capacity value; (2) When the operating state of the two traction power supply arms is in the operating range B, the power generated by the braking of the traction power supply arm β is transferred to the traction power supply arm α through the modular multi-level power regulator, and the power difference of the traction power supply arm α |P La |-|P Lb |, and then discharge the supercapacitor to provide the power difference. When the supercapacitor's state of charge SOC Sc <SOC Scmin When the battery is discharged; (3) When the operating state of the two traction power supply arms is in the operating range C, the power generated by the braking of the traction power supply arm β is transferred to the traction power supply arm α through the modular multi-level power regulator, and the power difference generated by the traction power supply arm β |P Lb |-|P La |, based on the generated power difference, the battery is charged first. When the battery state of charge SOC Ba >SOC Bamax When the supercapacitor is charged based on the excess power difference, the switch is switched. When the supercapacitor's state of charge SOC Sc >SOC Scmax When the excess power difference is consumed by the braking resistor; the SOC Bamax State of charge SOC Ba Maximum set capacity value; the SOC Scmax State of charge SOC Sc Maximum set capacity value.

4. The hybrid energy storage converter energy management method according to claim 3, characterized in that: Step 3: According to the operating range, the calculated state of charge SOC Sc and SOC Ba The values ​​jointly determine the charge and discharge management of the supercapacitor and battery, including: (4) When the operating state of the two traction power supply arms is in the operating range D, the power generated by the braking of the traction power supply arm α is transferred to the traction power supply arm β through the modular multi-level power regulator, and the power difference of the traction power supply arm β is calculated. Lb |-|P La |, and then discharge the supercapacitor to provide the power difference. When the supercapacitor's state of charge SOC Sc <SOC Scmin When the battery is discharged; (5) When the operating state of the two traction power supply arms is in the operating range E, the power generated by the braking of the traction power supply arm α is transferred to the traction power supply arm β through the modular multi-level power regulator, and the power difference generated by the traction power supply arm α |P La |-|P Lb |, based on the generated power difference, the battery is charged first. When the battery state of charge SOC Ba >SOC Bamax When the supercapacitor is charged based on the excess power difference, the switch is switched. When the supercapacitor's state of charge SOC Sc >SOC Scmax When the excess power difference is consumed by the braking resistor; (6) When the two traction power supply arms are in the operating state of the operating range F, the battery is charged first based on the power generated by the braking of the traction power supply arm α and the traction power supply arm α. When the battery state of charge SOC Ba >SOC Bamax When the supercapacitor is charged based on the excess power difference, the switch is switched. When the supercapacitor's state of charge SOC Sc >SOC Scmax When the braking resistor is turned on, the excess power difference is consumed by the braking resistor.

5. The hybrid energy storage converter energy management method according to claim 4, characterized in that: The multi-level converter specifically includes a half-bridge submodule, a first capacitor, a first inductor, a Buck-Boost converter and a supercapacitor; The half-bridge submodule is electrically connected to the Buck-Boost converter, and a first capacitor is connected in series between the two output ends of the half-bridge submodule; the first output end of the Buck-Boost converter is connected in series with a first inductor and then connected to the first end of the supercapacitor; the second output end of the Buck-Boost converter is electrically connected to the second end of the supercapacitor.

6. The hybrid energy storage converter energy management method according to claim 5, characterized in that: The power converter modules are connected in parallel using an ISOP structure.

7. The hybrid energy storage converter energy management method according to claim 6, characterized in that: The output end of the power converter module with series input and parallel output is electrically connected to a braking resistor and a heat sink.

8. A hybrid energy storage converter energy management system, characterized in that: The method comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the energy management method of the hybrid energy storage converter according to any one of claims 1 to 4 when executing the computer program.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the hybrid energy storage converter energy management method according to any one of claims 1 to 4.

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