Energy router coordination control system, method, device and medium

Abstract

The invention discloses an energy router coordination control system, method and device and a medium, and relates to the technical field of direct current distribution networks, and the energy router coordination control system comprises an I-path AC 10 kV and an II-path AC 10 kV; the I-path AC10kV is connected to the power adapter 1, one end of the output end of the power adapter 1 is connected to the DC750V bus, and the other end of the output end of the power adapter 1 is connected to the dual-power quick change-over switch 2; the path II AC10kV is connected to a box transformer substation 3, one end of the output end of the box transformer substation 3 is connected to an AC-DC converter 4, the other end of the output end of the box transformer substation 3 is connected to a dual-power quick change-over switch 2, and a 500kW converter 4 is connected to a DC750V bus; and the dual-power quick change-over switch 2 is connected to an AC 380V bus. By introducing a dynamic virtual impedance adjusting mechanism, the circulating current problem in parallel operation is effectively suppressed, and the stability of bus voltage and power distribution is improved.

Description

Technical Field

[0001] This invention relates to the field of DC distribution network technology, and in particular to an energy router coordination control system, method, device and medium. Background Technology

[0002] With the rapid development of power electronics technology, DC power distribution systems, with their advantages of efficient and reliable connection to DC loads, distributed energy generation, and energy storage units, have gradually become a research hotspot in various countries.

[0003] Traditional energy routers have three major drawbacks: Low voltage control accuracy: Droop control causes bus voltage deviation >5% (e.g., 37.5V deviation in a 750V system), requiring an additional voltage regulator; Severe parallel circulating current: Inconsistent voltage reference values ​​and equivalent impedances between different converters can easily generate large circulating currents in parallel systems. For example, the circulating current caused by parameter differences in multiple converters connected in parallel can exceed 10% of the rated current, accelerating device aging. Significant impact during mode switching: Existing energy routers often lack effective coordination and control mechanisms during mode switching, which can easily cause voltage surges, frequency shifts, or power surges at the moment of grid connection or off-grid switching, such as off-grid to grid connection switching time > 100ms and voltage sag > 10%.

[0004] Therefore, there is an urgent need for an energy router coordination control method that can coordinate the switching between different operating modes under the condition of multiple power sources and multiple converters operating in parallel, while taking into account the stability of bus voltage, reasonable power distribution and energy storage status coordination, so as to improve the operational stability and reliability of AC / DC hybrid systems under complex operating conditions. Summary of the Invention

[0005] In view of the above-mentioned problems, the present invention provides an energy router coordination and control system, method, device and medium.

[0006] Therefore, the problem that this invention aims to solve is that existing energy routers often lack an effective coordination and control mechanism during the switching of operating modes, which can easily cause voltage surges, frequency shifts, or power surges at the moment of grid connection or off-grid switching.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an energy router coordination and control system, comprising: a I-channel AC10kV and a II-channel AC10kV; the I-channel AC10kV is connected to a power adapter 1, one end of the output of the power adapter 1 is connected to a DC 750V bus, and the other end is connected to a dual-power fast transfer switch 2; the II-channel AC10kV is connected to a transformer substation 3, one end of the output of the transformer substation 3 is connected to an AC-DC converter 4, and the other end is connected to the dual-power fast transfer switch 2; the 500kW converter 4 is connected to the DC 750V bus. A 50V busbar; the dual-power fast transfer switch 2 is connected to the AC380V busbar; where AC represents alternating current and DC represents direct current; the control side includes a central management layer, an edge control layer, and an equipment execution layer; the central management layer generates global commands based on grid status, state of charge (SOC), and load forecast; the edge control layer is deployed locally on each converter and performs dynamic virtual impedance calculation and pre-synchronization control; the equipment execution layer supports switching between virtual synchronous generator (VSG), voltage-frequency control (VF), active-reactive power control (PQ), and droop mode.

[0008] In a preferred embodiment of the energy router coordinated control system described in this invention, the AC380V bus is further connected to an AC-DC energy storage converter 5; the DC750V bus is further connected to a DC-DC energy storage converter 6 and a DC-DC converter 7; the other ends of the AC-DC energy storage converter 5 and the DC-DC energy storage converter 6 are connected to an energy storage system; the other end of the DC-DC converter 7 is connected to a photovoltaic power generation side; and the output ends of both the AC380V bus and the DC750V bus are load sides.

[0009] As a preferred embodiment of the energy router coordinated control system described in this invention, the edge control layer performs dynamic virtual impedance calculation, which includes: real-time acquisition of the output current of all parallel converters. And calculate the average current. ; Generate virtual impedance values = , Indicates the adaptive gain coefficient; outputs the voltage adjustment command. ,in The rated voltage of the busbar This refers to the secondary voltage compensation value issued by the central management.

[0010] As a preferred embodiment of the energy router coordinated control system described in this invention, wherein: the adaptive gain coefficient The formula is expressed as follows: in, Indicates the threshold. Indicates the slope factor. This represents the reference gain.

[0011] As a preferred embodiment of the energy router coordinated control system described in this invention, the global commands of the central management layer include four grid fault modes: Mode 1: Both AC10kV line I and AC10kV line II are normal, power adapter 1 and AC-DC converter 4 are connected in parallel with droop control, and , satisfy ;in, This indicates the secondary voltage compensation value issued by the central management to the I-path AC10kV. This indicates the secondary voltage compensation value issued by the central management to the II AC10kV line. This indicates the output power of power adapter 1. This indicates the output power of AC-DC converter 4; Mode 2: AC10kV I is normal, AC10kV II is faulty, power adapter 1 starts in VF mode and switches between off-grid and grid-connected via pre-synchronous phase locking; Mode 3: AC10kV I is faulty, AC10kV II is normal, AC-DC converter 4 and DC-DC energy storage converter 6 are connected in droop parallel, and when the energy storage system SOC < 40%, forced energy storage switching constant current charging is performed; Mode 4: Both AC10kV I and AC10kV II are faulty, the AC380V bus is supported by AC-DC energy storage converter 5 in VF mode, and the DC750V bus uses photovoltaic-energy storage joint voltage regulation.

[0012] As a preferred embodiment of the energy router coordination and control system described in this invention, the pre-synchronization phase locking includes real-time detection of the microgrid voltage by the edge control layer. With grid voltage phase difference and frequency difference The VSG controller injects virtual damping torque. ;in, Where Δω is the damping coefficient, Δω = ;when ≤2° and When the frequency is ≤0.05Hz for 10ms, close the grid-connected switch.

[0013] As a preferred embodiment of the energy router coordination control system described in this invention, the control logic of the energy storage system SOC includes: if the energy storage system SOC ≥ 40%, the DC-DC energy storage converter 6 operates in droop mode, and the energy storage output power... ;in, Indicates the droop coefficient. This indicates the measured voltage of the DC 750V bus; if the SOC of the energy storage system is less than 40%, switch to constant current charging mode, and the charging current will be... , = ;in, This represents the current proportionality coefficient.

[0014] To address the aforementioned technical problems, this invention provides the following technical solution: an energy router coordination control method, comprising: determining the current operating mode and generating corresponding global control commands based on the grid operating status, energy storage system state of charge (SOC), and load forecast information obtained by the central management layer; under the constraints of the global control commands, performing dynamic virtual impedance calculations on the parallel-operating converters by the edge control layer, and generating corresponding voltage adjustment commands based on the output current deviation of each converter to achieve bus voltage stability and power sharing control; when a switching of operating modes is detected, the edge control layer triggers a pre-synchronization control process to coordinate and adjust the voltage phase and frequency of the microgrid side and the grid side, and completing the grid-connected or off-grid switching after meeting the preset synchronization conditions; and switching the energy storage converter between the droop control mode and the constant current charging control mode according to the SOC state of the energy storage system to coordinate the output of new energy sources, the charging and discharging behavior of energy storage, and the bus voltage support relationship.

[0015] A computer device includes a memory and a processor, the memory storing a computer program, the processor executing the computer program to implement the steps of an energy router coordination control method as described above.

[0016] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of an energy router coordination control method as described above.

[0017] The beneficial effects of this invention are as follows: By constructing a hierarchical coordinated control system combining a central management layer, an edge control layer, and an equipment execution layer, this invention achieves unified coordination and adaptive control under different operating modes in AC / DC hybrid systems with multiple energy sources and multiple converters operating in parallel. By introducing a dynamic virtual impedance adjustment mechanism, it effectively suppresses circulating current problems in parallel operation and improves the stability of bus voltage and power distribution. Through pre-synchronization control and mode switching collaborative logic, it significantly reduces voltage and power surges during grid connection, off-grid operation, and fault switching, thereby improving power supply continuity. At the same time, by combining the state of charge of the energy storage system with load changes for coordinated regulation, it makes the relationship between new energy output, energy storage charging and discharging, and load power supply more reasonable, thus improving the overall reliability, adaptability, and system-level stability of the energy router under complex operating conditions. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a structural diagram of an energy router coordination and control system in Example 1.

[0020] Figure 2 This is a control side structure diagram of an energy router coordination control system in Example 1. Detailed Implementation

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0023] Example 1, referring to Figure 1 and Figure 2 This is the first embodiment of the present invention. This embodiment provides an energy router coordination and control system including: one AC10kV channel and two AC10kV channels; the one AC10kV channel is connected to a power adapter 1, one end of the output terminal of the power adapter 1 is connected to a DC750V bus, and the other end is connected to a dual power supply fast switching switch 2.

[0024] The second AC10kV line is connected to transformer substation 3. One end of the output of transformer substation 3 is connected to AC-DC converter 4, and the other end is connected to dual power supply fast transfer switch 2. The 500kW converter 4 is connected to the DC750V bus.

[0025] The dual power supply quick transfer switch 2 is connected to the AC380V bus; where AC represents alternating current and DC represents direct current.

[0026] like Figure 2 As shown, the control side includes a central management layer, an edge control layer, and a device execution layer.

[0027] Central management layer: Deployed in industrial control computers, it generates global instructions based on grid status, state of charge (SOC), and load forecast.

[0028] Edge control layer: Deployed locally on each converter, it performs dynamic virtual impedance calculation and pre-synchronization control.

[0029] Device execution layer: Deployed on the power module driver board, it supports switching between virtual synchronous generator (VSG), voltage-frequency control (VF), active-reactive power control (PQ), and droop mode.

[0030] The AC380V bus is also connected to AC-DC energy storage converter 5; the DC750V bus is also connected to DC-DC energy storage converter 6 and DC-DC converter 7.

[0031] The other end of AC-DC energy storage converter 5 and DC-DC energy storage converter 6 are connected to the energy storage system.

[0032] The other end of the DC-DC converter 7 is connected to the photovoltaic power generation side.

[0033] Both the AC380V bus and the DC750V bus output terminals are on the load side.

[0034] The edge control layer performs dynamic virtual impedance calculations, including: real-time acquisition of the output current of all parallel converters. And calculate the average current. .

[0035] Generate virtual impedance value = , This represents the adaptive gain coefficient.

[0036] Output voltage adjustment command ,in The rated voltage of the busbar This refers to the secondary voltage compensation value issued by the central management.

[0037] Adaptive gain coefficient The formula is expressed as follows: in, Indicates the threshold. Indicates the slope factor. This represents the reference gain.

[0038] The central management's overall directives include four power grid failure modes: Mode 1: Both AC10kV line I and AC10kV line II are normal. Power adapter 1 and AC-DC converter 4 are connected in parallel with droop control. , satisfy .

[0039] in, This indicates the secondary voltage compensation value issued by the central management to the I-path AC10kV. This indicates the secondary voltage compensation value issued by the central management to the II AC10kV line. This indicates the output power of power adapter 1. This indicates the output power of AC-DC converter 4.

[0040] Mode 2: If AC10kV I is normal and AC10kV II is faulty, power adapter 1 will start in VF mode and switch between off-grid and grid-connected operation through pre-synchronous phase locking.

[0041] Mode 3: When the I-channel AC10kV is faulty and the II-channel AC10kV is normal, the AC-DC converter 4 and the DC-DC energy storage converter 6 are connected in parallel with a drooping configuration, and the energy storage system SOC < 40%, the energy storage is forced to switch to constant current charging.

[0042] Mode 4: Both AC10kV line I and AC10kV line II are faulty. The AC380V bus is supported by AC-DC energy storage converter 5 in VF mode, and the DC750V bus is stabilized by a combination of photovoltaic and energy storage.

[0043] Pre-synchronization phase locking includes real-time detection of microgrid voltage at the edge control layer. With grid voltage phase difference and frequency difference .

[0044] The VSG controller injects virtual damping torque. ;in, Where Δω is the damping coefficient, Δω = .

[0045] when ≤2° and When the frequency is ≤0.05Hz for 10ms, close the grid-connected switch.

[0046] The control logic for the SOC of the energy storage system includes: if the SOC of the energy storage system is ≥ 40%, the DC-DC energy storage converter 6 operates in droop mode, and the energy storage output power... ;in, Indicates the droop coefficient. This indicates the measured voltage of the DC 750V bus.

[0047] If the energy storage system's SOC is less than 40%, switch to constant current charging mode, and the charging current will be... , = ;in, This represents the current proportionality coefficient.

[0048] To further explain, if the DC load power exceeds the sum of the output power of power adapter 1 and DC-DC converter 7, it will cause the DC 750V bus voltage to drop. When the voltage drops below 0.9 times the rated value, and When the voltage is >1.1 (low DC voltage, high load), cut off non-critical loads; among which, This represents the total active load of the DC bus. This indicates the output power of the photovoltaic system.

[0049] Example 2 is the second embodiment of the present invention, which differs from the first embodiment in that: an energy router coordination control method includes: Based on the grid operation status, energy storage system state of charge (SOC), and load forecast information obtained by the central management layer, the current operation mode is determined and corresponding global control commands are generated.

[0050] Under the constraints of global control commands, the edge control layer performs dynamic virtual impedance calculations on the parallel-operating converters and generates corresponding voltage adjustment commands based on the output current deviation of each converter to achieve bus voltage stability and power sharing control.

[0051] When a change in operating mode is detected, the edge control layer triggers a pre-synchronization control process to coordinate and adjust the voltage phase and frequency of the microgrid side and the grid side, and completes the grid-connected or off-grid switching after the preset synchronization conditions are met.

[0052] Based on the SOC state of the energy storage system, the energy storage converter is switched between droop control mode and constant current charging control mode to coordinate the output of new energy sources, the charging and discharging behavior of energy storage, and the support relationship of bus voltage.

[0053] To further explain, when the bus voltage or load status exceeds the preset threshold, non-critical load shedding or restoration operations are performed according to the load grading strategy to ensure the stable operation of the system. The execution results of each control command are confirmed through the command-state bidirectional verification mechanism between the edge control layer and the equipment execution layer. If an execution abnormality occurs, redundant control or protection control procedures are triggered.

[0054] Specifically, the coordinated control method for the DC750V bus includes: (1) When 40% < SOC < 90%, DC-DC converter 7 operates in MPPT mode and DC-DC energy storage converter 6 operates in constant voltage mode. When the DC load is heavy, energy storage and photovoltaic power supply together to power the load. When the DC load is close to no load, photovoltaic power generation charges the energy storage.

[0055] (2) When the photovoltaic energy is particularly abundant, SOC>90%, and the DC load is unloaded, the DC-DC converter 7 operates in standby mode. When the DC load is suddenly connected and SOC<90%, the DC-DC converter 7 switches from standby mode to MPPT mode.

[0056] (3) When the photovoltaic energy is particularly abundant and the SOC is less than 40%, the DC-DC converter 7 operates in MPPT mode and the DC-DC energy storage converter 6 operates in voltage regulation mode for charging.

[0057] (4) When the photovoltaic energy is close to 0 and the battery SOC is less than 40%, the DC-DC converter 7 switches to standby mode and the DC-DC energy storage converter 6 stops discharging and switches to standby mode.

[0058] Example 3, the third embodiment of the present invention, differs from the previous two embodiments in that: if the function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0059] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-including system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0060] More specific examples of computer-readable media (a non-exhaustive list) include: electrical connections (electronic devices) having one or more wires, portable computer disk drives (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0061] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented in combination with any of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0062] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An energy router coordination and control system, employing a dual-path structure, characterized in that: include, I-line AC10kV and II-line AC10kV; The I-channel AC10kV is connected to the power adapter (1). One end of the output terminal of the power adapter (1) is connected to the DC750V bus, and the other end is connected to the dual power supply fast transfer switch (2). The II AC10kV circuit is connected to the transformer substation (3). One end of the output terminal of the transformer substation (3) is connected to the AC-DC converter (4), and the other end is connected to the dual power supply fast switching switch (2). The 500kW converter (4) is connected to the DC750V bus. The dual power supply quick-change switch (2) is connected to the AC380V busbar; Where AC represents alternating current and DC represents direct current; The control side includes a central management layer, an edge control layer, and an equipment execution layer; The central management layer generates global instructions based on grid status, state of charge (SOC), and load forecasting. The edge control layer is deployed locally on each converter and performs dynamic virtual impedance calculation and pre-synchronization control. The device execution layer supports switching between Virtual Synchronous Generator (VSG), Voltage-Frequency Control (VF), Active-Reactive Power Control (PQ), and droop mode.

2. The energy router coordination and control system as described in claim 1, characterized in that: The AC380V bus is also connected to an AC-DC energy storage converter (5). The DC750V bus is also connected to a DC-DC energy storage converter (6) and a DC-DC converter (7). The other end of the AC-DC energy storage converter (5) and the DC-DC energy storage converter (6) are connected to the energy storage system; The other end of the DC-DC converter (7) is connected to the photovoltaic power generation side; Both the AC380V bus and the DC750V bus output terminals are load sides.

3. The energy router coordination and control system as described in claim 1, characterized in that: The edge control layer performs dynamic virtual impedance calculations, including: Real-time acquisition of output current from all parallel converters And calculate the average current. ; Generate virtual impedance value = , Indicates the adaptive gain coefficient; Output voltage adjustment command ,in The rated voltage of the busbar This refers to the secondary voltage compensation value issued by the central management.

4. The energy router coordination and control system as described in claim 3, characterized in that: The adaptive gain coefficient The formula is expressed as follows: in, Indicates the threshold. Indicates the slope factor. This represents the reference gain.

5. The energy router coordination and control system as described in claim 1, characterized in that: The central management system's global directives include four power grid failure modes: Mode 1: Both AC10kV I and AC10kV II are normal. The power adapter (1) and AC-DC converter (4) are connected in parallel with droop control. , satisfy ; in, This indicates the secondary voltage compensation value issued by the central management to the I-path AC10kV. This indicates the secondary voltage compensation value issued by the central management to the II AC10kV line. This indicates the output power of the power adapter (1). This indicates the output power of the AC-DC converter (4); Mode 2: If the I-channel AC10kV is normal and the II-channel AC10kV is faulty, the power adapter (1) starts in VF mode and switches between off-grid and on-grid through pre-synchronous phase locking; Mode 3: When the I-channel AC10kV is faulty and the II-channel AC10kV is normal, the AC-DC converter (4) and the DC-DC energy storage converter (6) are connected in parallel and the energy storage system SOC is less than 40%, the energy storage system is forced to switch to constant current charging. Mode 4: Both AC10kV I and AC10kV II are faulty. The AC380V bus is supported by the AC-DC energy storage converter (5) in VF mode, and the DC750V bus is stabilized by a combination of photovoltaic and energy storage.

6. The energy router coordination and control system as described in claim 5, characterized in that: The pre-synchronization phase locking includes real-time detection of the microgrid voltage by the edge control layer. With grid voltage phase difference and frequency difference ; The VSG controller injects virtual damping torque. ;in, Let Δω be the damping coefficient. ; when ≤2° and When the frequency is ≤0.05Hz for 10ms, close the grid-connected switch.

7. The energy router coordination and control system as described in claim 5, characterized in that: The control logic of the energy storage system's SOC includes: If the SOC of the energy storage system is greater than or equal to 40%, the DC-DC energy storage converter (6) operates in droop mode, and the energy storage output power is... ;in, Indicates the droop coefficient. This indicates the measured voltage of the DC 750V bus. If the energy storage system's SOC is less than 40%, switch to constant current charging mode, and the charging current will be... , = ;in, This represents the current proportionality coefficient.

8. An energy router coordination control method, employing an energy router coordination control system as described in any one of claims 1 to 7, characterized in that: include, Based on the grid operation status, energy storage system state of charge (SOC), and load forecast information obtained by the central management layer, the current operation mode is determined and corresponding global control commands are generated. Under the constraints of global control commands, the edge control layer performs dynamic virtual impedance calculations on the parallel-operating converters and generates corresponding voltage adjustment commands based on the output current deviation of each converter to achieve bus voltage stability and power sharing control. When a change in operating mode is detected, the edge control layer triggers a pre-synchronization control process to coordinate and adjust the voltage phase and frequency between the microgrid side and the grid side, and completes the grid-connected or off-grid switching after the preset synchronization conditions are met. Based on the SOC state of the energy storage system, the energy storage converter is switched between droop control mode and constant current charging control mode to coordinate the output of new energy sources, the charging and discharging behavior of energy storage, and the support relationship of bus voltage.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, it implements the steps of the energy router coordination control method according to claim 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the processor, it implements the steps of the energy router coordination control method of claim 8.

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