Hybrid energy storage type converter and energy management method thereof

Abstract

The invention provides a hybrid energy storage type converter and an energy management method thereof, and the method comprises the steps: collecting the voltage and current of traction power supply arms alpha and beta at two sides, and calculating the load power PLa and PLb of the two traction power supply arms; defining and dividing an operation interval according to the load power PLa and the load power PLb, and calculating the state of charge SOCSc of the super capacitor and the state of charge SOCBa of the storage battery; and according to the operation interval, the calculated state of charge SOCSc and the SOCBa value, determining charging and discharging management of the super capacitor and the storage battery. By setting the scheduling priority levels of the two, the balance of rapid charging and discharging and energy storage is realized; energy between the traction power supply arm and the energy storage unit can be effectively distributed, and the electric energy quality is effectively improved; in addition, in the braking process, energy generated by braking is preferentially utilized, the energy utilization rate of the traction power supply system is improved, and the operation cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of power regulators for power electronic power supply systems, in particular to a hybrid energy storage converter and an energy management method thereof. Background Art

[0002] High-speed railways and urban rail transit systems are widely used around the world. As an efficient and environmentally friendly mode of transportation, the performance of their power systems directly affects operational efficiency and energy consumption levels. When a train brakes, especially on some long downhill sections in China, the energy generated by braking is considerable. However, the existing single-phase railway power supply system directly recovers energy through the traction power supply arm, which will cause negative sequence and harmonic problems in the three-phase traction network. Recovery through braking resistors will cause energy waste, and additional heat dissipation devices will be required if the braking resistor overheats. The existing power conditioner is connected to the system through a back-to-back converter, and energy storage batteries or supercapacitors are connected across the DC bus. However, this structure requires a bulky step-down transformer on the AC side of the back-to-back converter, which reduces the volume, weight and efficiency of the system. In addition, this centralized energy storage configuration requires longer charging and discharging time, which is difficult to meet occasions that require rapid and sensitive response;

[0003] In addition, high-speed railway traction loads are characterized by randomness and volatility, and the characteristics of the energy storage medium for energy feedback also need to be fully considered. Supercapacitors have low energy density and high power density, and can be charged and discharged up to millions of times, making them suitable for short-term energy storage and release; batteries have high energy density, but low power density, slow energy release, and limited charge and discharge life. Based on the randomness and volatility of railway traction loads, there are significant differences in the charge and discharge rates and charge and discharge life of the two energy storage media. How to formulate a reasonable energy management method is not only related to the system's operating stability but also to the system's service life;

[0004] Therefore, how to achieve energy recovery in the traction system based on the power conditioner and suppress grid voltage fluctuations, and how to formulate a reasonable energy management method for the hybrid energy storage converter to take into account the characteristics of different energy storage components and improve the reliability of the system are urgent issues to be solved. Summary of the invention

[0005] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a hybrid energy storage inverter and an energy management method thereof, which can effectively improve the power quality on the one hand, and on the other hand, enhance the energy utilization rate of the traction power supply system and reduce the operating cost.

[0006] The present invention provides a hybrid energy storage 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: 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.

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

[0011] 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 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 is calculated. La |-|P Lb |, and then discharge the supercapacitor to provide the power difference. When the supercapacitor is charged to the state 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 |P generated by the traction power supply arm β is calculated. Lb |-|P La |, based on the generated power difference, the battery is charged first. When the battery's state of charge SOC Ba >SOC Bamax When the supercapacitor is charged, the switch is switched to charge the supercapacitor based on the excess power difference. 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 is charged to the state 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's state of charge SOC Ba >SOC Bamax When the supercapacitor is charged, the switch is switched to charge the supercapacitor based on the excess power difference. Sc >SOC Scmax When the excess power difference is consumed by the braking resistor;

[0024] (6) When the operating state of the two traction power supply arms is in 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 charge state SOC Ba >SOC Bamax When the supercapacitor is charged, the switch is switched to charge the supercapacitor based on the excess power difference. Sc >SOC Scmax The excess power difference is consumed by the braking resistor.

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

[0026] The modular multilevel power conditioner 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 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;

[0027] The cascaded power converter module includes multiple groups of active bridges connected in series, which adjust and transform the voltage and then output it in parallel to the DC / DC on the low-voltage DC bus;

[0028] The DC / DC regulates the voltage again and inputs it into the connected battery.

[0029] Preferably, the multi-level converter specifically includes a half-bridge submodule, a first capacitor, a first inductor, a Buck-Boost converter and a supercapacitor;

[0030] 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; a first inductor is connected in series to the first output end of the Buck-Boost converter and then connected to the first end of the supercapacitor; and the second output end of the Buck-Boost converter is electrically connected to the second end of the supercapacitor.

[0031] Preferably, the power converter modules are output in parallel using an ISOP structure.

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

[0033] In order to solve the above technical problems, the present invention also provides a hybrid energy storage inverter energy management system, including a memory, a processor and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the hybrid energy storage inverter energy management method described in the present invention is implemented.

[0034] 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.

[0035] The beneficial effects of the present invention are:

[0036] 1. The hybrid energy storage converter adopts multi-level cascade technology in structure, which effectively reduces the cost of devices and eliminates the step-down transformer, greatly reducing the volume and weight of the system. In addition, the hybrid energy storage converter combines the characteristics of supercapacitors and batteries, sets the scheduling priority level of the two, and achieves a balance between fast charging and discharging and energy storage.

[0037] 2. The hybrid energy storage inverter 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 quality of electric energy. In addition, during the braking process, the energy generated by braking is used preferentially. 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, 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 It is a schematic diagram of the division of the operating range of the traction power supply arm;

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

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

[0043] Embodiment 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: According to the operating range, the calculated 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, according to the load power P La and P Lb Define the operating interval, such as Figure 3 As shown: Specifically including:

[0049] 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 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 is calculated. La |-|P Lb |, and then discharge the supercapacitor to provide the power difference. When the supercapacitor is charged to the state 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 |P generated by the traction power supply arm β is calculated. Lb |-|P La |, based on the generated power difference, the battery is charged first. When the battery's state of charge SOC Ba >SOC Bamax When the supercapacitor is charged, the switch is switched to charge the supercapacitor based on the excess power difference. 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 is charged to the state 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's state of charge SOC Ba >SOC Bamax When the supercapacitor is charged, the switch is switched to charge the supercapacitor based on the excess power difference. Sc >SOC Scmax When the excess power difference is consumed by the braking resistor;

[0062] (6) When the operating state of the two traction power supply arms is in 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 charge state SOC Ba >SOC Bamax When the supercapacitor is charged, the switch is switched to charge the supercapacitor based on the excess power difference. Sc >SOC Scmax The excess power difference is consumed by the braking resistor.

[0063] Embodiment 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 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 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 groups of active bridges connected in series, 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 into 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; a first inductor is connected in series to the first output end of the Buck-Boost converter and then connected to the first end of the supercapacitor; and 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] Embodiment three:

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

[0074] Embodiment 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 five:

[0077] The present invention also provides a computer program product or a computer program, which includes a computer instruction stored in a computer-readable storage medium. A processor of a computer device reads the computer instruction from the computer-readable storage medium, and the processor executes the computer instruction, so that the computer device executes the method provided in the above-mentioned various embodiments.

[0078] The above description is only a preferred embodiment of the present invention and an explanation of the technical principles used. Those skilled in the art should understand that the disclosure scope involved in the present invention is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present invention (but not limited to) to form a technical solution.

Claims

1. A hybrid energy storage converter energy management method, characterized in that: Use 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 and divide the operating range and calculate the supercapacitor's state of charge SOC Sc and the battery's state of charge SOC Ba ; 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.

2. The hybrid energy storage converter energy management method according to claim 1, characterized in that: In step 2, according to 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 operation 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 is calculated. La |-|P Lb |, and then discharge the supercapacitor to provide the power difference. When the supercapacitor is charged to the state 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 |P generated by the traction power supply arm β is calculated. Lb |-|P La |, based on the generated power difference, the battery is charged first. When the battery's state of charge SOC Ba >SOC Bamax When the supercapacitor is charged, the switch is switched to charge the supercapacitor based on the excess power difference. 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 is charged to the state 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's state of charge SOC Ba >SOC Bamax When the supercapacitor is charged, the switch is switched to charge the supercapacitor based on the excess power difference. Sc >SOC Scmax When the excess power difference is consumed by the braking resistor; (6) When the operating state of the two traction power supply arms is in 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 charge state SOC Ba >SOC Bamax When the supercapacitor is charged, the switch is switched to charge the supercapacitor based on the excess power difference. Sc >SOC Scmax The excess power difference is consumed by the braking resistor.

5. A hybrid energy storage converter, characterized in that: The hybrid energy storage converter comprises a modular multi-level power conditioner, a cascaded power converter module and a storage battery; wherein the modular multi-level power conditioner, the cascaded power converter module and the storage battery are electrically connected in sequence; The modular multilevel power conditioner 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 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; The cascaded power converter module includes multiple groups of active bridges connected in series, 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 regulates the voltage again and inputs it into the connected battery.

6. The hybrid energy storage converter according to claim 5, 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; a first inductor is connected in series to the first output end of the Buck-Boost converter and then connected to the first end of the supercapacitor; and the second output end of the Buck-Boost converter is electrically connected to the second end of the supercapacitor.

7. The hybrid energy storage converter according to claim 5, characterized in that: The power converter modules are connected in parallel and adopt an ISOP structure.

8. The hybrid energy storage converter according to claim 5, characterized in that: The output end of the cascaded power converter module is electrically connected to a braking resistor and a heat sink.

9. A hybrid energy storage converter energy management system, characterized in that: It comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the energy management method for a hybrid energy storage converter described in any one of claims 1 to 4 is implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored computer program, wherein when the computer program is executed, 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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