Multi-source heterogeneous intelligent regulation and control device and method

Abstract

The invention discloses a multi-source heterogeneous intelligent regulation and control device and method, and the device comprises a regulation and control unit which is electrically connected with a DC bus, a tracking main power supply, and a first end of regulation and control inversion output, and a second end of the DC bus is electrically connected with a second end of the regulation and control inversion output. The third end of the regulation and control inversion output is electrically connected with the second end of the tracking main power, the fourth end of the regulation and control inversion output is electrically connected with standby power output, and the third end of the tracking main power is electrically connected with main power input; the multi-power input interface module is electrically connected with the third end of the direct-current bus, and the multi-power input interface module is used for being externally connected with a plurality of standby power input devices; wherein after the plurality of standby power input devices are regulated and controlled by the regulation and control unit, the standby power output parameters are consistent with the main power input power supply by tracking the parameters of the main power on the basis of load requirements.

Description

Technical Field

[0001] This invention belongs to the field of electrified railway power supply technology, specifically relating to a multi-source heterogeneous intelligent control device and method. Background Technology

[0002] In railway transportation systems, primary loads such as signaling systems and communication equipment are core infrastructures that ensure the safe operation and dispatching of trains. They have extremely stringent requirements for power supply continuity and power quality. These loads not only need to achieve seamless switching between main and backup power supplies when the main power supply fails to avoid operational accidents caused by power outages, but also need to ensure that the output voltage is always maintained within a stable range to meet the equipment's precise requirements for power quality.

[0003] To meet the aforementioned power supply demands, existing technologies often employ traditional PID regulation or simple voltage control methods to achieve the start-up, shutdown, and output regulation of backup power supplies. However, with the widespread application of multi-source heterogeneous power sources (such as power grids, energy storage cabinets, photovoltaic power generation, etc.) in railway power supply systems, traditional control schemes have gradually exposed many technical shortcomings, making it difficult to adapt to the power supply guarantee requirements under complex operating conditions: First, the multi-source coordination capability is weak, making it impossible to accurately coordinate and control different types of heterogeneous power sources. During power switching, significant voltage fluctuations are easily generated due to parameter mismatch, which may even lead to abnormal shutdown of load equipment in severe cases. Second, the wide voltage adaptability is poor. When the input voltage fluctuation exceeds ±20%, the output voltage distortion rate (THD) often exceeds the critical standard of 5%, which cannot meet the requirements of primary loads for power purity. Third, the dynamic response rate is slow. When facing sudden operating conditions such as voltage changes, the response time usually exceeds 50ms, which is far from meeting the millisecond-level switching and adjustment requirements of primary loads, posing a risk of power outage. Fourth, the synchronization performance of different power grids is insufficient. The in-phase voltage difference when different power grids are connected often exceeds 30V, which does not meet the industry standards for railway power supply systems and limits the application of multi-grid complementary power supply modes. Summary of the Invention

[0004] This invention provides a multi-source heterogeneous intelligent control device and method to address the technical deficiencies mentioned in the background section.

[0005] To achieve the above objectives, the present invention employs the following technical solution: Firstly, a multi-source heterogeneous intelligent control device is provided, comprising: The control unit is electrically connected to the DC bus, the tracking main power supply, and the first terminal of the control inverter output. The second terminal of the DC bus is electrically connected to the second terminal of the control inverter output. The third terminal of the control inverter output is electrically connected to the second terminal of the tracking main power supply. The fourth terminal of the control inverter output is electrically connected to a backup power output. The third terminal of the tracking main power supply is electrically connected to a main power input. A multi-power input interface module is electrically connected to the third terminal of the DC bus, and the multi-power input interface module is used to connect multiple backup power input devices. Among them, after being regulated by the control unit, the backup power input devices track the parameters of the main power supply based on the load demand, so that the backup power output parameters are consistent with the main power input power supply.

[0006] Furthermore, the multi-power input interface module includes: The system includes a bus capacitor, two AC / DC converters, a bidirectional DC / DC converter, and a DC / DC boost converter. The bus capacitor is connected to the third terminal of the DC bus, and the first terminals of the two AC / DC converters, the bidirectional DC / DC converter, and the DC / DC boost converter are electrically connected to the third terminal of the DC bus. The backup power input device includes: The system includes a 27.5kV overhead contact line transformer, mains power, rural power, energy storage cabinet, and photovoltaic power generation. Two AC / DC converters are included: a first AC / DC converter and a second AC / DC converter. The 27.5kV overhead contact line transformer is electrically connected to the second terminal of the first AC / DC converter. The mains power and rural power are electrically connected to the second terminal of the second AC / DC converter. The energy storage cabinet is electrically connected to the second terminal of the bidirectional DC / DC converter. The photovoltaic power generation system is electrically connected to the second terminal of the DC / DC boost converter.

[0007] Furthermore, the first AC / DC converter and the second AC / DC converter have the same structure.

[0008] Furthermore, the bidirectional DC / DC converter is used to convert the charging and discharging energy between the energy storage cabinet and the DC bus.

[0009] Furthermore, the output voltage of the DC / DC booster is matched with the rated voltage of the DC bus, and is used to boost the low-voltage DC power output from the photovoltaic power generation and connect it to the DC bus.

[0010] Furthermore, the bus capacitor is used to stabilize the voltage of the DC bus and suppress voltage ripple caused by load fluctuations or power switching on the DC bus.

[0011] Furthermore, the control unit includes a load detection module, which is used to collect the load current, voltage and power parameters of multiple backup power input devices in real time to obtain the load demand.

[0012] Furthermore, the control unit also includes a main power adjustment module, which is used to adjust the output power or on / off state of the main power input according to the load demand parameters collected by the load detection module.

[0013] Furthermore, the multi-power input interface module also includes an overcurrent protection unit, which is connected in series with the first terminal of the first AC / DC converter, the second AC / DC converter, the bidirectional DC / DC converter, and the DC / DC boost converter to prevent overload of each power input branch.

[0014] Secondly, a multi-source heterogeneous intelligent control method is provided, wherein the method is performed using a multi-source heterogeneous intelligent control device as described above, comprising: The power supply of multiple backup power input devices is regulated to the rated voltage of the DC bus via a DC / DC boost converter; The main power input status and the load requirements of the two backup power input devices are obtained, so that the control unit can adjust the backup power input status.

[0015] Compared with the prior art, the present invention has the following beneficial effects: Through the control unit and multi-power input interface module, precise and coordinated control can be achieved for different types of heterogeneous power sources, such as the 27.5kV overhead transformer, energy storage cabinet, and photovoltaic power generation in the railway catenary. After being regulated by the control unit, multiple backup power input devices can track the parameters of the main power supply based on load demand, ensuring that the backup power output parameters are consistent with the main power input parameters. This avoids significant voltage fluctuations caused by parameter mismatch during power switching, effectively preventing abnormal shutdowns of load equipment and improving the stability and reliability of the railway power supply system. Furthermore, the control unit can process and adjust the input voltage. When the input voltage fluctuation exceeds ±20%, the stability of the output voltage can still be guaranteed, ensuring that the output voltage distortion rate (THD) meets the requirements of primary loads for power purity, i.e., not exceeding the critical standard of 5%, thus ensuring that primary loads such as railway signaling systems and communication equipment can obtain high-quality power supply. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a multi-source heterogeneous intelligent control device provided by the present invention; The components include: 1. Bus capacitor; 2. First AC / DC converter; 3. Second AC / DC converter; 4. Bidirectional DC / DC converter; 5. DC / DC boost converter; 6. DC bus; 7. Control unit; 8. Tracking main power; 9. Controlling inverter output; 10. Main power input; 11. Backup power output; 12. 27.5kV cascade transformer for railway catenary; 13. Mains power / rural power; 14. Energy storage cabinet; 15. Photovoltaic power generation. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0023] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0024] To address the technical deficiencies mentioned in the background art, this embodiment provides a device and photovoltaic modules for protecting offshore photovoltaic modules during construction.

[0025] The present invention will now be described in further detail with reference to the accompanying drawings: See Figure 1 The first aspect of this invention provides a multi-source heterogeneous intelligent control device, comprising: a control unit 7, which is electrically connected to a DC bus 6, a tracking main power supply 8, and a first terminal of a control inverter output 9; a second terminal of the DC bus 6 is electrically connected to a second terminal of the control inverter output 9; a third terminal of the control inverter output 9 is electrically connected to a second terminal of the tracking main power supply 8; a fourth terminal of the control inverter output 9 is electrically connected to a backup power output 11; and a third terminal of the tracking main power supply 8 is electrically connected to a main power input 10; and a multi-power input interface module, which is electrically connected to a third terminal of the DC bus 6, for connecting multiple backup power input devices externally; wherein, after being controlled by the control unit 7, the multiple backup power input devices, based on load requirements, track the parameters of the main power supply 8 to ensure that the parameters of the backup power output 11 are consistent with the power supply of the main power input 10.

[0026] In the above structure, through the control unit 7 and the multi-power input interface module, it is possible to accurately coordinate and control different types of heterogeneous power sources such as the 27.5kV super-level transformer 12 of the railway catenary, the mains power / agricultural power 13, the energy storage cabinet 14, and the photovoltaic power generation 15.

[0027] Among them, after being regulated by the control unit 7, the parameters of the backup power output 11 can be made consistent with the power supply of the main power input 10 based on the load demand and the parameters of the main power 8. This avoids significant voltage fluctuations caused by parameter mismatch during power switching, effectively prevents abnormal shutdown of load equipment, and improves the stability and reliability of the railway power supply system.

[0028] When the input voltage is processed and regulated by the control unit 7, the stability of the output voltage can still be guaranteed when the input voltage fluctuation exceeds ±20%, so that the output voltage distortion rate (THD) meets the requirements of the primary load for the purity of electrical energy, that is, it does not exceed the critical standard of 5%, thus ensuring that the primary loads such as railway signaling systems and communication equipment can obtain high-quality power supply.

[0029] In addition, this multi-source heterogeneous intelligent control device can monitor main power parameters and load demand in real time. When voltage changes occur, the control unit 7 can react quickly and adjust the backup power output 11. Its dynamic response rate can meet the millisecond-level switching and adjustment requirements of the primary load, greatly reducing the risk of power outage and ensuring the continuity of train safe operation and dispatching command.

[0030] Furthermore, since railway power supply systems may be connected to different power grids, traditional solutions lack sufficient synchronization performance between different grids, limiting the application of multi-grid complementary power supply modes. This device, through precise control of the parameters of the backup power output 11 by the control unit 7, enables the backup power output 11 to match the parameters of the main power input 10, including voltage and phase, thereby effectively reducing the in-phase voltage difference when different power grids are connected, making it compliant with the industry standards for railway power supply systems. This provides the possibility for the application of multi-grid complementary power supply modes and further improves the power supply reliability and flexibility of railway power supply systems.

[0031] Furthermore, the multi-power input interface module includes a bus capacitor 1, two AC / DC converters, a bidirectional DC / DC converter 4, and a DC / DC booster 5. The bus capacitor 1 is connected to the third terminal of the DC bus 6, and the first terminals of the two AC / DC converters, the bidirectional DC / DC converter 4, and the DC / DC booster 5 are electrically connected to the third terminal of the DC bus 6. The backup power input device includes a 27.5kV cascade transformer 12 for the railway contact network, a mains / agricultural power supply 13, an energy storage cabinet 14, and a photovoltaic power generation unit 15. Among them, the two AC / DC converters include a first AC / DC converter 2 and a second AC / DC converter 3. The 27.5kV cascade transformer 12 for the railway contact network is electrically connected to the second terminal of the first AC / DC converter 2, the mains / agricultural power supply 13 is electrically connected to the second terminal of the second AC / DC converter 3, the energy storage cabinet 14 is electrically connected to the second terminal of the bidirectional DC / DC converter 4, and the photovoltaic power generation unit 15 is electrically connected to the second terminal of the DC / DC booster 5.

[0032] Specifically, the 27.5kV overhead transformer 12 of the railway contact network is adapted through the first AC / DC converter 2, the municipal / agricultural power 13 is connected through the second AC / DC converter 3, the energy storage cabinet 14 is connected by the bidirectional DC / DC converter 4, and the photovoltaic power generation 15 is adapted by the DC / DC booster 5. This breaks the limitation of traditional devices that can only connect to a single or a few types of power sources, and realizes full coverage of multiple heterogeneous power sources such as high-voltage industrial power, low-voltage civil power, energy storage power, and new energy power generation. This greatly expands the power access range of the device and improves the power selection flexibility and redundancy of the railway power supply system.

[0033] In practice, the multi-power input interface module converts electrical energy of different voltage types and amplitudes into electrical energy that matches the rated voltage of DC bus 6 before connecting it through various converters. At the same time, bus capacitor 1 is directly connected to DC bus 6, which can suppress voltage ripple caused by load fluctuations and power switching in real time, avoid the impact of voltage surges when different power sources are connected on the bus, ensure that the voltage of DC bus 6 is always stable within the rated range, provide a stable DC foundation for subsequent inverter output, and ensure the power quality of railway primary loads.

[0034] In addition, each backup power input device is connected to the DC bus 6 through an independent converter, forming an independent power supply branch. On the one hand, a single branch failure (such as a converter failure) will not affect the normal operation of other branches, ensuring the continuous supply of the remaining backup power and reducing the risk of power outages due to single-point failures. On the other hand, in conjunction with the subsequent overcurrent protection unit for individual protection of each branch, it can accurately prevent overload of each power input branch, avoid safety problems such as equipment burnout and line damage caused by overload, and improve the reliability and safety of the overall power supply system.

[0035] In this solution, the first AC / DC converter 2 and the second AC / DC converter 3 have the same structure. During assembly, there is no need to distinguish the installation position and connection logic of the two, which can reduce the operational complexity and error rate of the assembly personnel. At the same time, in the later maintenance, if one converter fails, it can be directly replaced by the spare part of the other converter, without the need to stock differentiated spare parts, shortening the maintenance cycle and reducing the cost of spare parts management. It is especially suitable for the needs of rapid repair in railway operations.

[0036] In this scheme, the bidirectional DC / DC converter 4 is used to convert the charging and discharging energy between the energy storage cabinet 14 and the DC bus 6; the output voltage of the DC / DC booster 5 is matched with the rated voltage of the DC bus 6, and is used to boost the low-voltage DC power output from the photovoltaic power generation 15 and connect it to the DC bus 6; the bus capacitor 1 is used to stabilize the voltage of the DC bus 6 and suppress the voltage ripple of the DC bus 6 caused by load fluctuations or power switching; the control unit 7 includes a load detection module, which is used to collect the load current, voltage and power parameters of multiple backup power input devices in real time to obtain the load demand.

[0037] In this scheme, the control unit 7 also includes a main power adjustment module, which is used to adjust the output power or on / off state of the main power input 10 according to the load demand parameters collected by the load detection module.

[0038] In this solution, the multi-power input interface module also includes an overcurrent protection unit, which is connected in series with the first terminal of the first AC / DC converter 2, the second AC / DC converter 3, the bidirectional DC / DC converter 4 and the DC / DC boost converter 5, respectively, to prevent overload of each power input branch.

[0039] During implementation, the 27.5kV high-voltage transformer 12 of the railway contact network uses high-frequency isolation converter and PWM rectification technology to solve the problem of high-voltage to low-voltage DC conversion and voltage stabilization, meeting the high-power input requirements. Addressing the large voltage fluctuations of the photovoltaic power generation 15, a DC / DC boost converter 5 and MPPT function are used to achieve efficient collection of photovoltaic power and standardized busbar access. For the bidirectional charging and discharging requirements of the energy storage cabinet 14, a full-bridge topology is used to achieve bidirectional energy flow, balancing efficiency and multiple protections to support emergency power supply and energy buffering. For the switching requirements between mains / rural power 13 and main power input 10, a parallel design of mechanical switches and solid-state relays is used to achieve fast and seamless switching, ensuring the continuity of low-voltage backup power.

[0040] In this scheme, the voltage control of DC bus 6 adopts a voltage-current dual closed-loop control structure, where the outer voltage loop uses a PI regulator to achieve zero steady-state error tracking. Let the target voltage of DC bus 6 be... The actual sampling voltage is Voltage error is defined as:

[0041] The time-domain expression of the PI controller is:

[0042] in This is the proportionality coefficient. For the integral coefficient. To improve the dynamic response speed, a voltage differential feedforward compensation term is introduced. The control quantity is then corrected as follows:

[0043] In discrete control systems, the backward difference method is used to achieve digitization. The formula for discretizing the integral term is:

[0044] in Let k be the sampling period and k be the sampling number. Then the expression for the discrete-domain PI controller is: (5) Inner loop current limiting mechanism: The voltage outer loop output serves as a reference value for the current inner loop. To prevent overcurrent, a bidirectional limiting circuit is set up:

[0045] in and These are the maximum charge and discharge current limits, the values ​​of which are determined by the rated parameters of the energy storage unit, and are typically...

[0046] Mathematical model of phase-locked loop synchronization algorithm: Three-phase voltage coordinate transformation Three-phase voltage in the abc stationary coordinate system Transform to the αβ coordinate system using Clark transformation:

[0047] Transformed into a dq rotating coordinate system via Park transformation:

[0048] in This is the output phase of the phase-locked loop. When the system is synchronized... The phase error should tend to zero, therefore it can be expressed as:

[0049] Second-order phase-locked loop structure: Phase tracking is achieved using a second-order PLL, and its control block diagram consists of a phase detector, a loop filter, and a voltage-controlled oscillator. The output of the phase detector is... The loop filter uses a PI regulator:

[0050] The integral element of the voltage-controlled oscillator is:

[0051] The system open-loop transfer function is:

[0052] To ensure system stability, a damping coefficient is designed. natural frequency The PI parameter is calculated as follows:

[0053] in The equivalent parameter for the system's moment of inertia is determined based on the inverter's power rating. .

[0054] Inverter dual closed-loop control strategy: Voltage outer loop controller design The inverter output voltage control employs a quasi-PR controller, achieving zero steady-state error tracking in a synchronous rotating coordinate system. The dq-axis voltage error is defined as:

[0055]

[0056] The PR controller transfer function is:

[0057] in This is the proportionality coefficient. For resonant gain, The cutoff frequency, ω is the fundamental angular frequency.

[0058] Current inner loop decoupling control: The inner current loop uses a PI controller to achieve fast dynamic response. Considering the inverter output inductance L and resistance R, the dq-axis current equation is:

[0059]

[0060] SVPWM modulation algorithm: In space vector pulse width modulation, the duration of the basic voltage vector is calculated as follows: Let the reference voltage vector be... It falls in sector I, and The included angle of the axis is ,but: (20) (twenty one) (twenty two) in For the switching cycle, This is the DC bus voltage. To reduce switching losses, a zero-vector symmetrical distribution method is adopted, with the action sequence of each vector being... .

[0061] Multi-mode switching control logic: Main power presence detection criteria Define voltage amplitude deviation Frequency deviation Phase jump .

[0062] When the following conditions are met: (twenty three) Duration If the main power is in normal mode, it is determined to be in normal mode; otherwise, it is switched to off-grid mode.

[0063] Seamless transition strategy: During mode switching, voltage feedforward pre-synchronization control is used, and the reference voltage amplitude transitions exponentially. (twenty four) in The transition time constant ensures that voltage fluctuations during switching are less than 2% of the rated value. Phase synchronization is achieved by adjusting the PLL reference frequency. (25) Synchronization coefficient This ensures that the phase difference converges to <1° within 10ms.

[0064] In this scheme, the DC bus 6 is equipped with a PI controller with a proportional coefficient Kp of 0.5~2.0 and an integral time Ti of 0.1~1.0 seconds to achieve a voltage regulation accuracy within ±2%.

[0065] In this scheme, the inverter output 9 is controlled by a phase-locked loop (SOGI-PLL) synchronization algorithm based on a second-order generalized integrator to ensure that the phase difference between the output voltage and the main power is ≤1°, the frequency deviation is ≤0.5Hz, and the in-phase voltage difference between the main power input and the backup power output is <30V.

[0066] In this scheme, the voltage, frequency and waveform distortion rate of the backup power output meet the requirements of the national standard GB / T 15945-2008 "Power Quality Power System Frequency Deviation", with the total harmonic distortion (THD) of the waveform ≤5%.

[0067] In this scheme, a fuzzy PID control strategy is introduced in the mode judgment step. When the mains power / rural power 13 is interrupted, the system switching response time is ≤10ms, which meets the uninterrupted power supply requirements of sensitive loads.

[0068] In this scheme, a phase-shifted full-bridge DC / DC topology is used in the voltage conversion step to achieve a conversion efficiency of over 92%, and the efficiency fluctuation is ≤3% within the 20%~100% load range.

[0069] Secondly, a multi-source heterogeneous intelligent control method is provided, wherein the method is performed using a multi-source heterogeneous intelligent control device as described above, comprising: The power supply of multiple backup power input devices is regulated to the rated voltage of the DC bus via a DC / DC boost converter; The main power input status and the load requirements of the two backup power input devices are obtained, so that the control unit can adjust the backup power input status.

[0070] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A multi-source heterogeneous intelligent control device, characterized in that, include: The control unit is electrically connected to the DC bus, the tracking main power supply, and the first terminal of the control inverter output. The second terminal of the DC bus is electrically connected to the second terminal of the control inverter output. The third terminal of the control inverter output is electrically connected to the second terminal of the tracking main power supply. The fourth terminal of the control inverter output is electrically connected to a backup power output. The third terminal of the tracking main power supply is electrically connected to a main power input. A multi-power input interface module is electrically connected to the third terminal of the DC bus, and the multi-power input interface module is used to connect multiple backup power input devices. Among them, after being regulated by the control unit, the backup power input devices track the parameters of the main power supply based on the load demand, so that the backup power output parameters are consistent with the main power input power.

2. The multi-source heterogeneous intelligent control device according to claim 1, characterized in that, The multi-power input interface module includes: The system includes a bus capacitor, two AC / DC converters, a bidirectional DC / DC converter, and a DC / DC boost converter. The bus capacitor is connected to the third terminal of the DC bus, and the first terminals of the two AC / DC converters, the bidirectional DC / DC converter, and the DC / DC boost converter are electrically connected to the third terminal of the DC bus. The backup power input device includes: The system includes a 27.5kV overhead contact line transformer, mains power, rural power, energy storage cabinet, and photovoltaic power generation. Two AC / DC converters are included: a first AC / DC converter and a second AC / DC converter. The 27.5kV overhead contact line transformer is electrically connected to the second terminal of the first AC / DC converter. The mains power and rural power are electrically connected to the second terminal of the second AC / DC converter. The energy storage cabinet is electrically connected to the second terminal of the bidirectional DC / DC converter. The photovoltaic power generation system is electrically connected to the second terminal of the DC / DC boost converter.

3. The multi-source heterogeneous intelligent control device according to claim 2, characterized in that, The first AC / DC converter and the second AC / DC converter have the same structure.

4. The multi-source heterogeneous intelligent control device according to claim 2, characterized in that, The bidirectional DC / DC converter is used to convert the charging and discharging energy between the energy storage cabinet and the DC bus.

5. The multi-source heterogeneous intelligent control device according to claim 2, characterized in that, The output voltage of the DC / DC booster is matched with the rated voltage of the DC bus, and is used to boost the low-voltage DC power output from the photovoltaic power generation and connect it to the DC bus.

6. The multi-source heterogeneous intelligent control device according to claim 2, characterized in that, The bus capacitor is used to stabilize the voltage of the DC bus and suppress voltage ripple caused by load fluctuations or power switching.

7. The multi-source heterogeneous intelligent control device according to claim 1, characterized in that, The control unit includes a load detection module, which is used to collect the load current, voltage and power parameters of multiple backup power input devices in real time to obtain the load demand.

8. The multi-source heterogeneous intelligent control device according to claim 7, characterized in that, The control unit also includes a main power adjustment module, which is used to adjust the output power or on / off state of the main power input according to the load demand parameters collected by the load detection module.

9. A multi-source heterogeneous intelligent control device according to claim 2, characterized in that, The multi-power input interface module also includes an overcurrent protection unit, which is connected in series with the first terminal of the first AC / DC converter, the second AC / DC converter, the bidirectional DC / DC converter, and the DC / DC boost converter to prevent overload of each power input branch.

10. A multi-source heterogeneous intelligent control method, characterized in that, The method is performed using a multi-source heterogeneous intelligent control device as described in any one of claims 1-9, comprising: The power supply of multiple backup power input devices is regulated to the rated voltage of the DC bus via a DC / DC boost converter; The main power input status and the load requirements of the two backup power input devices are obtained, so that the control unit can adjust the backup power input status.

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