DC / DC and super capacitor cooperative control system of station DC flexible intelligent bus coupler device

Abstract

The invention is suitable for the technical field of electronic circuits, and provides a DC / DC and super capacitor cooperative control system of a station DC flexible intelligent bus coupler device, which comprises a bus coupler device, a DC bus, a bidirectional DC / DC converter and a super capacitor energy storage unit, the system is used for controlling the bidirectional DC / DC converter and the super capacitor energy storage unit to operate cooperatively so as to maintain the voltage stability of the DC bus. Monitoring the actual voltage value of the DC bus in real time; according to the deviation between the actual voltage value and the set value, the instantaneous output power proportion of the super capacitor energy storage unit and the steady-state output power proportion of the bidirectional DC / DC converter are dynamically adjusted; and when it is detected that the DC bus voltage deviation exceeds a preset threshold value, the super capacitor energy storage unit is preferentially controlled to carry out instantaneous power compensation, and the output power of the bidirectional DC / DC converter is adjusted to carry out steady-state power following. The problems of bus voltage transient instability, super capacitor over-discharge aging and low system operation efficiency are solved.

Description

Technical Field

[0001] The present invention relates to the field of electronic circuit technology, and in particular to a DC / DC and supercapacitor coordinated control system for a station-used DC flexible intelligent bus coupling device. Background Art

[0002] With the rapid development of smart substations and the large-scale application of power electronic equipment, the fluctuation of station DC system loads has become increasingly severe. Maintaining the stability of the DC bus voltage is particularly important when dealing with instantaneous high-power load shocks caused by circuit breaker operation and equipment startup. As a key device, the DC flexible intelligent bus-connecting device is directly affected by the stability of the DC bus voltage connected to it, which directly affects the reliable power supply of core loads such as protection and control within the station. At present, station-used DC flexible intelligent bus-connecting devices generally adopt an architecture that combines a bidirectional DC / DC converter with a supercapacitor energy storage unit to smooth power fluctuations and support the bus voltage. Conventional control methods usually set a fixed power distribution strategy for the supercapacitor energy storage unit and the bidirectional DC / DC converter or adopt a relatively simple cascade control.

[0003] When faced with sudden high-power load increases or decreases, bidirectional DC / DC converters, limited by the dynamic response speed of their power devices, are unable to instantaneously provide or absorb all the required power. This inevitably causes the DC bus voltage to briefly dip or overshoot, threatening sensitive loads. Furthermore, static power allocation strategies cannot be optimized in real time based on the actual deviation and changing trends of the bus voltage. When load changes are gradual, supercapacitors may be placed in unnecessary standby or shallow charge / discharge states, failing to fully utilize the overall efficiency advantages of the hybrid energy storage system. These shortcomings make it difficult for existing solutions to ensure the transient stability of the bus voltage while also balancing equipment life and system operating efficiency. Summary of the Invention

[0004] The present invention provides a DC / DC and supercapacitor coordinated control system for a station-use DC flexible intelligent bus coupling device, which is used to solve the problem of difficulty in balancing equipment life and system operating efficiency while ensuring the transient stability of the bus voltage.

[0005] The present invention provides a DC / DC and supercapacitor coordinated control system for a station-use DC flexible intelligent bus coupling device, comprising a bus coupling device, a DC bus, a bidirectional DC / DC converter, and a supercapacitor energy storage unit. The bus coupling device is connected to the DC bus, one end of the bidirectional DC / DC converter is connected to the DC bus, and the other end is connected to the supercapacitor energy storage unit. The coordinated control system is used to control the coordinated operation of the bidirectional DC / DC converter and the supercapacitor energy storage unit to maintain the voltage stability of the DC bus. The coordinated control system is used to:

[0006] The actual voltage value of the DC bus is monitored in real time; and the ratio of the instantaneous output power of the supercapacitor energy storage unit to the steady-state output power of the bidirectional DC / DC converter is dynamically adjusted according to the deviation between the actual voltage value and the set value. When it is detected that the DC bus voltage deviation exceeds a preset threshold, the supercapacitor energy storage unit is preferentially controlled to perform instantaneous power compensation, and then the output power of the bidirectional DC / DC converter is adjusted to perform steady-state power following.

[0007] Furthermore, the collaborative control system is specifically used to:

[0008] Dynamically allocating the output power ratio of the supercapacitor energy storage unit and the bidirectional DC / DC converter based on the comparison result of the absolute value of the DC bus voltage deviation and the preset deviation threshold; wherein:

[0009] When the absolute value of the voltage deviation is greater than a first threshold, controlling the supercapacitor energy storage unit to provide a compensation power of a first preset proportional value;

[0010] When the absolute value of the voltage deviation is greater than a second threshold value and less than the first threshold value, controlling the supercapacitor energy storage unit to provide a compensation power of a second preset proportional value;

[0011] When the absolute value of the voltage deviation is less than the second threshold, the bidirectional DC / DC converter is controlled to provide compensation power of a third preset proportional value.

[0012] Furthermore, the first preset ratio value>the second preset ratio value>the third preset ratio value, and the first threshold value>the second threshold value.

[0013] Furthermore, the collaborative control system is also used to monitor the state of charge of the supercapacitor energy storage unit in real time, including:

[0014] The first preset ratio value, the second preset ratio value, and the third preset ratio value are dynamically corrected according to the state of charge; wherein, when the state of charge is lower than a preset lower limit, the first preset ratio value and the second preset ratio value are reduced; when the state of charge is higher than a preset upper limit, the charging ratio value of the supercapacitor energy storage unit is reduced.

[0015] Furthermore, the dynamic correction further includes:

[0016] If the state of charge exceeds a preset safety range, the power compensation function of the supercapacitor energy storage unit is cut off, and the power compensation task is switched to be independently undertaken by the bidirectional DC / DC converter.

[0017] Furthermore, the supercapacitor energy storage unit is preferentially controlled to perform instantaneous power compensation, specifically including:

[0018] When the voltage deviation is detected to exceed the preset threshold, the supercapacitor energy storage unit is controlled to respond at the maximum allowable power change rate and complete power compensation within milliseconds;

[0019] Then adjusting the output power of the bidirectional DC / DC converter specifically includes:

[0020] After the supercapacitor energy storage unit is activated, the output power of the bidirectional DC / DC converter is gradually adjusted to a target value at a preset slope, and the adjustment time scale is in seconds.

[0021] Furthermore, the determination of the maximum allowable power change rate specifically includes:

[0022] Dynamically calculate the instantaneous power limit based on the real-time state of charge, temperature and historical charge and discharge cycle number of the supercapacitor energy storage unit;

[0023] The adjustment of the preset slope specifically includes:

[0024] If it is detected that the bus voltage overshoot exceeds the allowable value after power compensation, the preset slope of the next cycle is reduced;

[0025] If a power compensation response delay is detected, the maximum allowed power change rate is increased.

[0026] Furthermore, the system further comprises:

[0027] a high-speed communication unit, connecting the bidirectional DC / DC converter and the supercapacitor energy storage unit;

[0028] The high-speed communication unit is used to communicate in real time the output current limit of the bidirectional DC / DC converter, the charge state of the supercapacitor energy storage unit, and the maximum charge and discharge power limit, thereby providing power constraint conditions for dynamic adjustment operations.

[0029] Furthermore, the high-speed communication unit is specifically a fiber optic communication interface; the real-time interaction also includes a fault status flag and a power emergency freeze instruction.

[0030] Furthermore, the system further comprises:

[0031] When communication is interrupted, the third preset ratio value is used to distribute power, and the rate of change of the state of charge of the supercapacitor energy storage unit is limited to a safe range.

[0032] It can be seen from the above technical solutions that the present invention has the following advantages:

[0033] The present invention monitors the actual value of the DC bus voltage in real time and dynamically adjusts the ratio of the instantaneous output power of the supercapacitor energy storage unit to the steady-state output power ratio of the bidirectional DC / DC converter based on its deviation from the set value. When it is detected that the DC bus voltage deviation exceeds a preset threshold, the supercapacitor energy storage unit is preferentially controlled to perform instantaneous power compensation, and then the output power of the bidirectional DC / DC converter is adjusted for steady-state power following. This collaborative control mechanism leverages the extremely fast response speed of supercapacitor energy storage units to prioritize smoothing out sharp voltage fluctuations, effectively avoiding instantaneous bus voltage drops or overshoots caused by the inherent dynamic response delay of the bidirectional DC / DC converter, significantly improving the system's transient stability in response to sudden load changes. At the same time, it prevents the supercapacitor from continuously deep charging and discharging or assuming excessive steady-state power, effectively protecting the supercapacitor and extending its service life. This strategy of dynamically allocating power ratios in real time based on voltage deviation allows the supercapacitor to focus on its strengths in instantaneous high-power throughput, while the bidirectional DC / DC converter operates in its most efficient steady-state operating conditions. This fully leverages the respective advantages of the two power units and significantly improves the overall operating efficiency of the entire hybrid energy storage system under a wide range of load changes. Therefore, this system effectively solves the problems of transient bus voltage instability, supercapacitor over-discharge aging, and low system operating efficiency in existing technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Schematic diagram of the topological structure of the collaborative control system in the present invention. DETAILED DESCRIPTION

[0035] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "corresponding to" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0036] Example 1

[0037] See also Figure 1The DC / DC and supercapacitor collaborative control system of the station-use DC flexible intelligent bus coupling device provided in the embodiment of the present application includes: a bus coupling device, a DC bus, a bidirectional DC / DC converter and a supercapacitor energy storage unit, the bus coupling device is connected to the DC bus, one end of the bidirectional DC / DC converter is connected to the DC bus, and the other end is connected to the supercapacitor energy storage unit; the collaborative control system is used to control the coordinated operation of the bidirectional DC / DC converter and the supercapacitor energy storage unit to maintain the voltage stability of the DC bus; the collaborative control system is used to: monitor the actual voltage value of the DC bus in real time; dynamically adjust the instantaneous output power ratio of the supercapacitor energy storage unit and the steady-state output power ratio of the bidirectional DC / DC converter according to the deviation between the actual voltage value and the set value; wherein, when it is detected that the DC bus voltage deviation exceeds the preset threshold, the supercapacitor energy storage unit is preferentially controlled to perform instantaneous power compensation, and then the output power of the bidirectional DC / DC converter is adjusted to perform steady-state power following.

[0038] Specifically, the system monitors the actual voltage value of the DC bus in real time and compares it with the set value to obtain the voltage deviation. Based on the dynamic changes of the deviation, the system calculates and dynamically adjusts the ratio of instantaneous output power borne by the supercapacitor energy storage unit and the ratio of steady-state output power borne by the bidirectional DC / DC converter in real time. When it detects that the voltage deviation exceeds the preset threshold (indicating a sudden power change such as sudden load addition / unloading), the system immediately prioritizes driving the fast-responding supercapacitor energy storage unit for high-power instantaneous compensation or absorption, using its millisecond-level response characteristics to quickly smooth out bus voltage fluctuations. After the supercapacitor completes the initial transient support, the system dynamically adjusts the output power of the bidirectional DC / DC converter so that its power output climbs or decreases as needed, gradually taking over and assuming steady-state power requirements, achieving smooth power tracking and long-term stable maintenance of the bus voltage. This mechanism achieves precise matching and seamless connection of the advantages of the two power units through time-sharing coordinated control of transient priority compensation + steady-state progressive following.

[0039] In this embodiment, the collaborative control system is specifically used to:

[0040] The output power ratio of the supercapacitor energy storage unit and the bidirectional DC / DC converter is dynamically allocated based on the comparison result of the absolute value of the DC bus voltage deviation and the preset deviation threshold; wherein:

[0041] When the absolute value of the voltage deviation is greater than a first threshold, controlling the supercapacitor energy storage unit to provide a compensation power of a first preset proportional value;

[0042] When the absolute value of the voltage deviation is greater than the second threshold and less than the first threshold, controlling the supercapacitor energy storage unit to provide compensation power of a second preset proportional value;

[0043] When the absolute value of the voltage deviation is less than the second threshold, the bidirectional DC / DC converter is controlled to provide compensation power of a third preset proportional value.

[0044] Among them, the first preset ratio value>the second preset ratio value>the third preset ratio value, and the first threshold value>the second threshold value.

[0045] Specifically, the coordinated control system uses a three-level threshold to allocate the power output ratio of the supercapacitor and the DC / DC converter according to the specific size of the absolute value of the DC bus voltage deviation:

[0046] When the absolute value of the voltage deviation is detected to exceed the first threshold set at a higher level (typically ±5% of the bus rated voltage), the system is determined to be in a severe transient disturbance condition. At this time, the supercapacitor energy storage unit is immediately controlled to output a high instantaneous compensation power of the first preset proportion (set to 70%-90% of the total required compensation power) to forcibly suppress voltage mutations; when the absolute value of the voltage deviation is between the second threshold set at a medium level and the first threshold (the second threshold is typically ±2% of the bus rated voltage), it is determined to be a moderate disturbance condition. The system controls the supercapacitor to output a moderate compensation power of the second preset proportion (set to 30%-60% of the total compensation power) to provide necessary transient support while avoiding excessive call; when the absolute value of the voltage deviation is lower than the second threshold, it is determined to be a steady state or slightly fluctuating condition. The bidirectional DC / DC converter mainly outputs the dominant compensation power of the third preset proportion (set to 80%-100% of the total compensation power) to maintain fine voltage regulation.

[0047] The first preset ratio is strictly greater than the second preset ratio, the second preset ratio is strictly greater than the third preset ratio, and the first threshold is strictly greater than the second threshold. This principle of decreasing ratios as the deviation decreases and setting thresholds in stages ensures that the supercapacitor only bears a high proportion of transient power when necessary to protect its lifespan, while also enabling the DC / DC converter to achieve optimal efficiency in steady state.

[0048] In this embodiment, the collaborative control system is also used to monitor the state of charge of the supercapacitor energy storage unit in real time; dynamically correct the first preset ratio value, the second preset ratio value and the third preset ratio value according to the state of charge; when the state of charge is lower than the preset lower limit, reduce the first preset ratio value and the second preset ratio value; when the state of charge is higher than the preset upper limit, reduce the charging ratio value of the supercapacitor energy storage unit.

[0049] The dynamic correction further includes: if the state of charge exceeds a preset safety range, the power compensation function of the supercapacitor energy storage unit is cut off, and the power compensation task is switched to be independently undertaken by the bidirectional DC / DC converter.

[0050] Specifically, the collaborative control system further implements dynamic safety corrections to the three power ratio values ​​defined above by real-time monitoring of the state of charge (SOC) of the supercapacitor energy storage unit:

[0051] When the state of charge is detected to be below the preset lower limit (typically 20%-30% of the rated capacity), indicating that the supercapacitor energy storage is insufficient, the system will simultaneously reduce the first preset ratio value and the second preset ratio value, for example, reducing the supercapacitor output ratio from 90% to 70% under severe disturbance conditions and from 60% to 40% under moderate disturbance conditions to limit its deep discharge; when the state of charge is above the preset upper limit (typically 80%-90% of the rated capacity), indicating that the supercapacitor is close to full charge, the system will significantly reduce its charging ratio value, for example, setting the upper limit of the feedback energy absorption ratio to 30% to avoid the risk of overcharging. If the state of charge exceeds the preset safety range (such as below 15% or above 95%), the system will immediately cut off the power compensation function of the supercapacitor energy storage unit and force the bidirectional DC / DC converter to independently assume all power compensation tasks until the state of charge returns to a safe range. By providing real-time constraints on the power distribution ratio through state-of-charge feedback, while maintaining bus voltage stability, a triple safety barrier is built for the supercapacitor: charge and discharge depth protection, power limit protection, and hard isolation under extreme working conditions.

[0052] In this embodiment, the supercapacitor energy storage unit is preferentially controlled to perform instantaneous power compensation, specifically including: at the moment when the voltage deviation is detected to exceed the preset threshold, the supercapacitor energy storage unit is controlled to respond at the maximum allowable power change rate and complete power compensation within milliseconds; and the output power of the bidirectional DC / DC converter is subsequently adjusted, specifically including: after the supercapacitor energy storage unit is activated, the output power of the bidirectional DC / DC converter is gradually adjusted to the target value at a preset slope, and the adjustment time scale is in seconds.

[0053] The determination of the maximum allowable power change rate specifically includes: dynamically calculating the instantaneous power limit value based on the real-time state of charge, temperature, and historical charge and discharge cycle number of the supercapacitor energy storage unit;

[0054] Adjustment of the preset slope specifically includes: if it is detected that the bus voltage overshoot exceeds the allowable value after power compensation, then reducing the preset slope of the next cycle; if it is detected that the power compensation response is delayed, then increasing the maximum allowable power change rate.

[0055] Specifically, at the moment when it is detected that the voltage deviation exceeds the preset threshold, the supercapacitor energy storage unit is immediately driven to respond with a dynamically calculated maximum allowable power change rate, and the instantaneous power compensation action is completed through a millisecond time scale of ≤10ms; the maximum allowable power change rate is determined based on the real-time charge state, operating temperature and historical charge and discharge cycle number of the supercapacitor energy storage unit to comprehensively calculate the instantaneous power limit, ensuring that the device safety boundary is not exceeded under extreme working conditions.

[0056] After the supercapacitor completes its initial transient support, the system controls the bidirectional DC / DC converter to gradually adjust its output power to the target value at a preset slope. This process uses a time scale of 0.5-2 seconds to avoid secondary impacts on the power grid. The system further dynamically optimizes key parameters through a closed-loop monitoring mechanism: if it detects that the bus voltage overshoot exceeds the allowable value (+3% of the rated voltage) after power compensation, it automatically reduces the preset slope of the next control cycle to slow the DC / DC power ramp rate; conversely, if a transient response delay is detected (actual compensation time >15ms), the maximum allowable power change rate of the supercapacitor is dynamically increased, thereby continuously improving the system's dynamic response performance and stability while ensuring equipment safety.

[0057] In this embodiment, the system also includes a high-speed communication unit connecting the bidirectional DC / DC converter and the supercapacitor energy storage unit. The high-speed communication unit is used to communicate in real time the output current limit of the bidirectional DC / DC converter, the state of charge of the supercapacitor energy storage unit, and the maximum charge and discharge power limits, providing power constraints for dynamic adjustment operations. The high-speed communication unit is specifically a fiber optic communication interface. The real-time communication also includes fault status flags and power emergency freeze instructions.

[0058] When communication is interrupted, power is distributed using a third preset ratio value, and the rate of change of the state of charge of the supercapacitor energy storage unit is limited to a safe range.

[0059] Specifically, a high-speed communication unit is used to establish a real-time data channel between the bidirectional DC / DC converter and the supercapacitor energy storage unit:

[0060] This unit continuously monitors the real-time output current limit of the bidirectional DC / DC converter, the state of charge (SOC) of the supercapacitor energy storage unit, and the maximum charge and discharge power limits, providing key safety constraints for dynamic power allocation. For example, it automatically limits the discharge ratio of the supercapacitor when the SOC is too low. It also extends the transmission fault status flag and power emergency freeze command. For example, if the DC / DC overtemperature is detected, it immediately freezes the power ramp, achieving cross-device cascade protection. When communication is interrupted, the system automatically downgrades to a preset safety mode, which forces the use of a third preset ratio value for power allocation (i.e., the bidirectional DC / DC converter takes the lead in compensation) and strictly limits the supercapacitor state of charge change rate to a safe range (e.g., charge and discharge rate ≤1% C / s) to avoid control disorder or equipment damage caused by communication failure.

[0061] It is understandable that those skilled in the art can, under the guidance of the above embodiments, combine various implementation methods in the above embodiments to obtain technical solutions of multiple implementation methods.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A DC / DC and supercapacitor coordinated control system for a station-use DC flexible intelligent bus coupling device, comprising a bus coupling device, a DC bus, a bidirectional DC / DC converter, and a supercapacitor energy storage unit, wherein the bus coupling device is connected to the DC bus, one end of the bidirectional DC / DC converter is connected to the DC bus, and the other end is connected to the supercapacitor energy storage unit; the coordinated control system is used to control the bidirectional DC / DC converter and the supercapacitor energy storage unit to operate in coordination to maintain voltage stability of the DC bus, and is characterized in that: The collaborative control system is used to: The actual voltage value of the DC bus is monitored in real time; and the ratio of the instantaneous output power of the supercapacitor energy storage unit to the steady-state output power of the bidirectional DC / DC converter is dynamically adjusted according to the deviation between the actual voltage value and the set value. When it is detected that the DC bus voltage deviation exceeds a preset threshold, the supercapacitor energy storage unit is preferentially controlled to perform instantaneous power compensation, and then the output power of the bidirectional DC / DC converter is adjusted to perform steady-state power following.

2. The DC / DC and supercapacitor coordinated control system of the station-use DC flexible intelligent bus coupling device according to claim 1 is characterized in that: The collaborative control system is specifically used for: Dynamically allocating the output power ratio of the supercapacitor energy storage unit and the bidirectional DC / DC converter based on the comparison result of the absolute value of the DC bus voltage deviation and the preset deviation threshold; wherein: When the absolute value of the voltage deviation is greater than a first threshold, controlling the supercapacitor energy storage unit to provide a compensation power of a first preset proportional value; When the absolute value of the voltage deviation is greater than a second threshold value and less than the first threshold value, controlling the supercapacitor energy storage unit to provide a compensation power of a second preset proportional value; When the absolute value of the voltage deviation is less than the second threshold, the bidirectional DC / DC converter is controlled to provide compensation power of a third preset proportional value.

3. The DC / DC and supercapacitor coordinated control system of the station-use DC flexible intelligent bus coupling device according to claim 2 is characterized in that: The first preset ratio value>the second preset ratio value>the third preset ratio value, and the first threshold value>the second threshold value.

4. The DC / DC and supercapacitor coordinated control system of the station-use DC flexible intelligent bus coupling device according to claim 3 is characterized in that: The coordinated control system is also used to monitor the state of charge of the supercapacitor energy storage unit in real time, including: The first preset ratio value, the second preset ratio value, and the third preset ratio value are dynamically corrected according to the state of charge; wherein, when the state of charge is lower than a preset lower limit, the first preset ratio value and the second preset ratio value are reduced; when the state of charge is higher than a preset upper limit, the charging ratio value of the supercapacitor energy storage unit is reduced.

5. The DC / DC and supercapacitor coordinated control system of the station-use DC flexible intelligent bus coupling device according to claim 4 is characterized in that: The dynamic correction further includes: If the state of charge exceeds a preset safety range, the power compensation function of the supercapacitor energy storage unit is cut off, and the power compensation task is switched to be independently undertaken by the bidirectional DC / DC converter.

6. The DC / DC and supercapacitor coordinated control system of the station-use DC flexible intelligent bus coupling device according to any one of claims 1 to 4, characterized in that: Prioritizing the control of the supercapacitor energy storage unit to perform instantaneous power compensation, specifically including: When the voltage deviation exceeds the preset threshold, the supercapacitor energy storage unit is controlled to respond at the maximum allowable power change rate and complete power compensation within milliseconds; Then adjusting the output power of the bidirectional DC / DC converter specifically includes: After the supercapacitor energy storage unit is activated, the output power of the bidirectional DC / DC converter is gradually adjusted to a target value at a preset slope, and the adjustment time scale is in seconds.

7. The DC / DC and supercapacitor coordinated control system of the station-use DC flexible intelligent bus coupling device according to claim 6 is characterized in that: The determination of the maximum allowable power change rate specifically includes: Dynamically calculate the instantaneous power limit based on the real-time state of charge, temperature and historical charge and discharge cycle number of the supercapacitor energy storage unit; The adjustment of the preset slope specifically includes: If it is detected that the bus voltage overshoot exceeds the allowable value after power compensation, the preset slope of the next cycle is reduced; If a power compensation response delay is detected, the maximum allowed power change rate is increased.

8. The DC / DC and supercapacitor coordinated control system of the station-use DC flexible intelligent bus coupling device according to claim 1 is characterized in that: The system further comprises: a high-speed communication unit, connecting the bidirectional DC / DC converter and the supercapacitor energy storage unit; The high-speed communication unit is used to communicate in real time the output current limit of the bidirectional DC / DC converter, the charge state of the supercapacitor energy storage unit, and the maximum charge and discharge power limit, thereby providing power constraint conditions for dynamic adjustment operations.

9. The DC / DC and supercapacitor coordinated control system of the station-use DC flexible intelligent bus coupling device according to claim 8, characterized in that: The high-speed communication unit is specifically an optical fiber communication interface; the real-time interaction also includes a fault status mark and a power emergency freeze instruction.

10. The DC / DC and supercapacitor coordinated control system of the station-use DC flexible intelligent bus coupling device according to claim 1, characterized in that: The system further comprises: When communication is interrupted, the third preset ratio value is used to distribute power, and the rate of change of the state of charge of the supercapacitor energy storage unit is limited to a safe range.

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