A modular bidirectional converter structure supporting distributed deployment

Abstract

The utility model discloses a kind of modularization bidirectional converter structures of supporting distributed deployment, it is related to the field of power electronics and electric energy conversion technology, and bidirectional converter includes one side setting as control cabinet, the other side setting as power cabinet, power cabinet inside is sequentially distributed as first power cabinet and second power cabinet, control cabinet is equipped with control mainboard and integrated power module, integrated power module is used to realize system operation control, communication management and power distribution;First power cabinet and second power cabinet accommodate 6 identical power unit modules respectively, each module adopts standardization size, and slide into cabinet body by guide rail;Support distributed deployment: control and power unit can be separated installation, adapt to narrow, irregular or scattered computer room environment, significantly reduce the centralized requirement to installation space, reduce equipment land concentration degree;Structural height modularization: power unit adopts standardization plug structure, facilitate maintenance and power expansion;Power supply and charging integration.

Description

Technical Field

[0001] This utility model relates to the field of power electronics and power conversion technology, specifically to a modular bidirectional converter structure that supports distributed deployment. Background Technology

[0002] With the rapid development of new energy power generation and energy storage systems, bidirectional converters (PCS, Power Conversion System), as key equipment connecting the DC side (such as batteries and photovoltaics) and the AC power grid, are facing increasingly higher requirements for reliability, flexibility and maintainability.

[0003] Existing bidirectional converters mostly adopt a centralized integrated cabinet structure, with the control unit, drive circuit, and power module all integrated within the same enclosed chassis. This structure has the following drawbacks: Large space occupation: The equipment is bulky and has high requirements for the net height and passage width of the installation site, making it difficult to adapt to space-constrained scenarios such as power distribution rooms and basements; Inflexible capacity expansion: Power upgrades require replacing the entire unit or adding a large parallel cabinet, resulting in high expansion costs; Inconvenient maintenance: The entire machine needs to be powered off when a fault occurs, module replacement is difficult, and system availability is affected; The power supply structure is complex: it usually has an independent auxiliary power supply to power the control circuit and a separate pre-charging device, which results in a large number of components and an increase in failure points; Complex wiring: Power modules are connected by rigid busbars or ordinary cables, resulting in severe electromagnetic interference, which is not conducive to modularization and long-distance deployment.

[0004] Some existing solutions propose a modular converter, but its control and power are still centrally arranged, failing to solve the problem of space adaptability; other solutions achieve modularity, but lack direct power supply to the high-voltage side and integrated charging design, so there is still room for improvement in system integration.

[0005] Therefore, a modular bidirectional converter structure that supports distributed deployment is proposed. Utility Model Content

[0006] To address the problems existing in the prior art, this utility model provides a modular bidirectional converter structure that supports distributed deployment. The aim is to achieve a bidirectional converter structure that supports distributed layout, modular structure, integrated power supply and charging, and reliable connection, thereby solving the problems of large footprint, complex wiring, inconvenient expansion, and high requirements for installation environment of traditional equipment.

[0007] To achieve the above objectives, this utility model is implemented through the following technical solution: a modular bidirectional converter structure that supports distributed deployment, wherein the bidirectional converter includes a control cabinet on one side and a power cabinet on the other side, wherein the power cabinet contains a first power cabinet and a second power cabinet in sequence, and the control cabinet is equipped with a control motherboard and an integrated power module, wherein the integrated power module is used to realize system operation control, communication management and power distribution. The first and second power cabinets each contain six identical power unit modules. Each module adopts a standardized size and slides into the cabinet via guide rails. The control cabinet and the first power cabinet are connected by six shielded cables, which transmit control signals, drive signals and feedback signals respectively; the first power cabinet and the second power cabinet are connected by six similar cables to synchronize the modules. The DC side of the bidirectional converter is connected to the high-voltage DC bus with a voltage level of 1VDC via a high-voltage DC cable, while the AC side is connected to a 950V / 50Hz three-phase power grid.

[0008] Preferably, the integrated power module adopts a wide-range DC-DC converter module.

[0009] Preferably, the power supply required by the control motherboard is drawn from the high-voltage DC bus and converted to 24VDC by the integrated power module in the control cabinet before being supplied.

[0010] Preferably, the bidirectional converter also includes a pre-charge circuit, which is integrated into the power cabinet and is connected to the support capacitors of each power unit through a current-limiting resistor.

[0011] Preferably, the control cabinet and the first power cabinet are connected by six vehicle-grade shielded cables conforming to the QC / T 1067 standard.

[0012] Preferably, the upper part of the cabinet is equipped with an air-cooling device, and the bottom of each power unit module inside the power cabinet is provided with a heat-conducting substrate. The heat-conducting substrate is aligned with the heat dissipation air duct inside the power cabinet, and the heat dissipation air duct is connected to the air-cooling device to form a forced air-cooling heat dissipation path for heat dissipation treatment of the power unit module.

[0013] Preferably, the integrated power module and the pre-charging circuit are integrated on the same mounting plate inside the cabinet.

[0014] Preferably, the connection interface between the control cabinet and the power cabinet is equipped with a mechanical positioning structure and an anti-misinsertion guide design.

[0015] In summary, this utility model provides a modular bidirectional converter structure that supports distributed deployment. Compared with the prior art, this utility model has the following significant advantages: 1. Supports distributed deployment: The control and power units can be installed separately, adapting to small, irregular, or distributed data center environments, significantly reducing the centralized requirements for installation space and reducing the concentration of equipment footprint; 2. Highly modular structure: The power unit adopts a standardized plug-in structure, which facilitates maintenance and power expansion; 3. Integrated power supply and charging: By utilizing direct power supply and self-charging design on the high-voltage side, the independent auxiliary power supply system is eliminated, simplifying the structure, reducing costs, and improving system integration. 4. High reliability of connection: Adopting vehicle-grade shielded cable, it has excellent vibration resistance, interference resistance and long-distance transmission capability, and is suitable for complex industrial environments; 5. Safe and reliable startup: The built-in pre-charge circuit enables soft starting of the bus capacitor, protecting power devices and extending equipment life; 6. Flexible and convenient installation: Supports front maintenance and multi-point distributed installation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the modular bidirectional converter structure that supports distributed deployment according to this utility model; In the diagram: control cabinet 100, control motherboard 110, integrated power module 120, first power cabinet 200, second power cabinet 201, power unit module 210, vehicle-grade shielded cable 300, pre-charge circuit 500, air-cooling equipment 600, heat-conducting substrate 601, heat dissipation duct 602. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] This utility model is as follows: Figure 1 As shown, a modular bidirectional converter structure supporting distributed deployment is provided. The bidirectional converter includes a control cabinet 100 on one side and a power cabinet on the other side. The purpose is to enable the control cabinet and each power cabinet to be physically separated and distributed in different locations according to the site space conditions. The power cabinet contains a first power cabinet 200 and a second power cabinet 201. The control cabinet 100 is equipped with a control motherboard 110 and an integrated power module 120. The integrated power module 120 is used to realize system operation control, communication management and power distribution. The first power cabinet 200 and the second power cabinet 201 each contain 6 identical power unit modules 210. Each module adopts a standardized size and slides into the cabinet through guide rails. The control motherboard 110 is connected to the first power cabinet 200 via three shielded cables, which transmit control signals, drive signals, and feedback signals respectively; the control motherboard 110 is connected to the second power cabinet 201 via three similar cables for synchronization between modules. Specifically: such as Figure 1 As shown, the power unit modules 210 in the first power cabinet 200 are numbered sequentially as module 1, module 2, module 3, module 4, module 5, and module 6. Modules 1, 2, and 3 are connected to the control motherboard 110 via shielded cables. Module 1 is connected to module 4 via a shielded cable, module 2 is connected to module 5 via a shielded cable, and module 3 is connected to module 6 via a shielded cable. Similarly, the power unit modules 210 in the second power cabinet 201 are numbered sequentially as module 7, module 8, module 9, module 10, module 11, and module 12. Modules 7, 8, and 9 are connected to the control motherboard 110 via shielded cables. Module 7 is connected to module 12 via a shielded cable, module 8 is connected to module 11 via a shielded cable, and module 9 is connected to module 10 via a shielded cable. The DC side of the bidirectional converter is connected to the 1500VDC high-voltage DC bus via a 400V high-voltage DC cable, while the AC side is connected to a 950V / 50Hz three-phase power grid.

[0019] In at least one embodiment, the integrated power module 120 employs a wide-range DC-DC converter module.

[0020] In at least one embodiment, the operating power required by the control motherboard 110 is drawn from the high-voltage DC bus and converted to 24VDC by the integrated power module 120 in the control cabinet before being supplied. More specifically: the power cabinet's operating power supply is introduced from the high-voltage DC side, and after being stepped down by a wide input range DC-DC conversion module located in the control cabinet, the input voltage range covers 600V~2000VDC, and the output is a stable low-voltage DC (24VDC) to power the control circuit.

[0021] In at least one embodiment, the bidirectional converter further includes a pre-charge circuit 500, which is integrated into the power cabinet. The pre-charge circuit 500 consists of a current-limiting resistor, a charging contactor, and control logic. When powered on, the pre-charge contactor closes, and the supporting capacitors of each power unit are slowly charged through the current-limiting resistor. After the voltage reaches the set value, the pre-charge contactor opens, and then the AC circuit breaker closes, and the equipment enters normal operation. By setting the pre-charge circuit 500, excessive inrush current is avoided at the moment of closing.

[0022] In at least one embodiment, the control cabinet 100 and the first power cabinet 200 are connected by six vehicle-grade shielded cables 300 conforming to the QC / T 1067 standard. The vehicle-grade shielded cables adopt a twisted pair + shielding layer structure, and the control signal lines and drive signal lines are laid separately to reduce crosstalk. At the same time, the vehicle-grade shielded cables 300 have high insulation strength, electromagnetic interference resistance and mechanical durability, and are used to transmit control commands, drive pulses, status feedback and synchronization signals. The use of vehicle-grade cables can achieve reliable connection over long distances (≤30m), thereby reducing the centralized requirements for the spatial layout of the installation site.

[0023] In at least one embodiment, the upper part of the cabinet is provided with an air-cooling device 600, and the bottom of each power unit module 210 inside the power cabinet is provided with a heat-conducting substrate 601. The heat-conducting substrate 601 is aligned with the heat dissipation air duct 602 inside the power cabinet. The heat dissipation air duct 602 is connected to the air-cooling device 600 to form a forced air-cooling heat dissipation path for heat dissipation treatment of the power unit module 210.

[0024] In at least one embodiment, the integrated power module 120 and the pre-charging circuit 500 are integrated on the same mounting plate inside the cabinet and fixed inside the cabinet, reducing the number of external wiring connections.

[0025] In at least one embodiment, the connection interface between the control cabinet 100 and the power cabinet is equipped with a mechanical positioning structure and an anti-misinsertion guide design to ensure connection reliability.

[0026] In at least one embodiment, circuit breakers are provided at the bottom of the cabinets of the first power cabinet 200 and the second power cabinet 201. The circuit breakers are provided to disconnect and connect the load circuits of each power unit module 210 in the first power cabinet 200 and the second power cabinet 201, as well as to disconnect fault circuit protection, prevent the accident from escalating, and ensure safe operation.

[0027] As can be seen from the above embodiments, the innovations achieved by this patent are at least as follows: 1) The control cabinet and power cabinet are physically separated, supporting distributed installation and adapting to confined spaces; 2) Vehicle-grade shielded cables are used to achieve long-distance, high-reliability signal transmission; 3) The high-voltage side directly supplies power to the control circuit, eliminating the need for a separate auxiliary power supply; 4) Integrate a high-voltage pre-charge circuit to achieve soft start of the bus capacitor.

[0028] The embodiments described in this utility model are for illustrative purposes only and do not constitute a limitation on the scope of the claims. Other substantially equivalent substitutions that can be conceived by those skilled in the art are all within the protection scope of this utility model.

Claims

1. A modular bidirectional converter structure supporting distributed deployment, characterized in that, The bidirectional converter includes a control cabinet (100) on one side and a power cabinet on the other side. The power cabinet contains a first power cabinet (200) and a second power cabinet (201) in sequence. The control cabinet (100) is equipped with a control motherboard (110) and an integrated power module (120). The integrated power module (120) is used to realize system operation control, communication management and power distribution. The first power cabinet (200) and the second power cabinet (201) each accommodate six identical power unit modules (210), each module adopting a standardized size and sliding into the cabinet via guide rails; The control cabinet (100) and the first power cabinet (200) are connected by six shielded cables (300) to transmit control signals, drive signals and feedback signals respectively; the first power cabinet (200) and the second power cabinet (201) are connected by six similar cables to synchronize the modules. The DC side of the bidirectional converter is connected to the high-voltage DC bus via a high-voltage DC cable (400), and the AC side is connected to a 950V / 50Hz three-phase power grid.

2. The modular bidirectional converter structure supporting distributed deployment according to claim 1, characterized in that, The integrated power module (120) adopts a wide-range DC-DC converter module.

3. The modular bidirectional converter structure supporting distributed deployment according to claim 1, characterized in that, The power supply required by the control motherboard (110) is drawn from the high-voltage DC bus and converted to 24VDC by the integrated power module (120) in the control cabinet.

4. The modular bidirectional converter structure supporting distributed deployment according to claim 1, characterized in that, The bidirectional converter also includes a pre-charge circuit (500), which is integrated into the power cabinet. The pre-charge circuit (500) is connected to the support capacitor of each power unit through a current-limiting resistor.

5. A modular bidirectional converter structure supporting distributed deployment according to claim 1, characterized in that, The control cabinet (100) and the first power cabinet (200) are connected by six vehicle-grade shielded cables (300) conforming to the QC / T 1067 standard.

6. The modular bidirectional converter structure supporting distributed deployment according to claim 1, characterized in that, The upper part of the cabinet is equipped with an air-cooling device (600). The bottom of each power unit module (210) inside the power cabinet is provided with a heat-conducting substrate (601). The heat-conducting substrate (601) is aligned with the heat dissipation duct (602) inside the power cabinet. The heat dissipation duct (602) is connected to the air-cooling device (600) to form a forced air-cooling heat dissipation path for heat dissipation treatment of the power unit module (210).

7. A modular bidirectional converter structure supporting distributed deployment according to claim 4, characterized in that, The integrated power module (120) and the pre-charge circuit (500) are integrated on the same mounting plate inside the cabinet.

8. A modular bidirectional converter structure supporting distributed deployment according to claim 1, characterized in that, The connection interface between the control cabinet (100) and the power cabinet is equipped with a mechanical positioning structure and an anti-misinsertion guide design.

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