Direct current 270v power grid of special vehicle and power on / off control method

Abstract

The application belongs to the technical field of automatic control, and particularly relates to a special vehicle direct-current 270V power grid and power-on and power-off control method. The special vehicle direct-current 270V power grid comprises a direct-current 270V power supply, a 270V super capacitor, a medium-low voltage power distribution and safety protection device and a circuit rotating connector. The technical scheme of the application relates to direct-current 270V power grid power-on control, direct-current 270V power cable loosening detection, direct-current 270V insulation detection and control, direct-current 270V power supply overload control and 270V super state detection. The scheme realizes safe and reliable application of the direct-current 270V through perfect power-on and power-off control logic.

Description

Technical Field

[0001] This invention belongs to the field of automatic control technology, specifically relating to a 270V DC power grid for special vehicles and a power-on / off control method. Background Technology

[0002] With the rapid development of electrification and automation in special vehicles, traditional hydraulic and mechanical actuation equipment will gradually be replaced by electric motors and other electrical actuation equipment. However, the 28V power supply system of special vehicles can no longer meet the power requirements of small and medium-power electrical actuation equipment. Therefore, a DC 270V power supply and a power distribution and transmission network are needed to meet the power requirements of these devices. However, DC 270V exceeds the safe operating range. Therefore, to ensure the safety of the DC 270V power supply, a safe transmission and application circuit architecture and control strategy for DC 270V power is required to achieve safe application of the DC 270V power supply while meeting the power requirements of the electrical actuation equipment. Summary of the Invention

[0003] (a) Technical problems to be solved The technical problems to be solved by the present invention are: (1) how to achieve a stable supply of DC 270V power; (2) how to achieve safe power-on control of DC 270V power grid; and (3) how to achieve safe application and reliable transmission of DC 270V.

[0004] (II) Technical Solution To solve the above-mentioned technical problems, the present invention provides a special vehicle DC 270V power grid, which includes: a DC 270V power supply, a 270V supercapacitor, a medium and low voltage power distribution and safety protection device, and a circuit rotary connector. The 270V DC power supply is used for continuous power supply and includes a 270V generator and controller, as well as a power conversion device. The 270V generator and controller are used to convert mechanical energy into electrical energy, realize voltage regulation control, and realize current limiting output, overcurrent, overvoltage, and overtemperature protection. The power conversion device is used to realize stable output of the 270V DC power supply through voltage conversion and has the functions of overcurrent, overvoltage, undervoltage, overtemperature, and hardware fault protection. The 270V supercapacitor serves as an energy storage power source, used to suppress fluctuations in the DC 270V grid voltage, playing a role in peak shaving and valley filling, and providing a stable voltage supply for DC 270V electrical equipment; the 270V supercapacitor is equipped with a charger inside, which, after low-voltage power-on, will realize the 270V supercapacitor and charge the 270V supercapacitor to 270V±2V. The medium and low voltage power distribution and safety protection device is used to realize DC 270V and DC 28V power distribution management; DC 270V power distribution management includes power-on pre-charge control, DC 270V power grid insulation detection, overcurrent protection of electrical equipment, and isolation protection after short circuit of electrical equipment; The lower rotating part of the circuit rotary connector is fixed to the chassis, while the upper rotating part rotates with the upper assembly without affecting the transmission of electrical signals; the circuit rotary connector is used to transmit the 270V power from the chassis to the upper assembly.

[0005] Furthermore, the present invention also provides a power-on / off control method for a special vehicle's DC 270V power grid. This power-on / off control method is implemented based on the special vehicle's DC 270V power grid and includes: The low-voltage power-on testing process for medium-voltage power distribution and safety protection devices is as follows: a) Low-voltage power-on testing of medium-voltage power distribution and safety protection devices When the low-voltage power supply is powered on, the medium-voltage power distribution and safety protection devices are tested for insulation resistance and cable loosening. If the insulation resistance of the DC 270V power grid is ≤150kΩ, a low insulation warning will be issued, and the DC 270V power supply will be prohibited from being powered on. If a loose cable is detected in the DC power grid, a cable loosening warning will be issued, and the DC 270V power supply will be prohibited from being powered on.

[0006] b) Detection of 270V supercapacitor power-on status After the 270V supercapacitor performs a low-voltage power-on self-test, it will report its heartbeat and the status of the 270V supercapacitor main contactor to the upper left medium and low voltage power distribution device within 1 second.

[0007] c) Integration processing of medium-voltage power grid status The low-voltage power distribution device in the upper chassis performs comprehensive processing based on the insulation resistance group, the loosening status of the medium-voltage cable, and the self-test information of the low-voltage power distribution device, and sends the processing results to the medium-voltage power conversion device.

[0008] Upon receiving the medium-voltage power-on command and the medium-voltage power distribution device's power-on permission signal, the medium-voltage power conversion device increases the voltage from zero to 270V according to the equipment's voltage power-on slope and completes the pre-charging of the 270V supercapacitor.

[0009] The power-on / off control method further includes: protection and distribution control of the 270V DC power grid, specifically involving: 1) Operating modes and protection functions of 270V DC mains power supply a) Operating mode of DC 270V mains power supply The 270V DC power grid has two operating modes: constant voltage and constant current. According to the operating characteristics of the electrical equipment, the 270V DC generator and the 270V DC power converter operate in constant voltage mode, stabilizing the voltage through a 270V supercapacitor. In constant power mode, the 270V DC generator and the 270V DC power converter use a supercapacitor to supplement instantaneous power.

[0010] The operating modes and protection functions of the 270V DC mains power supply also include: b) Protection mode of 270V DC mains power supply The 270V DC power grid has overvoltage protection, overcurrent protection, and overtemperature protection; and it also has a derating operating mode.

[0011] 2) Operation of distribution protection for a 270V DC power grid The system includes insulation detection for distribution equipment and cable loosening detection for medium-voltage power grids, as well as overcurrent and short-circuit isolation protection for distribution branches; it also transmits distribution status information and protection information of distribution branches via a bus.

[0012] (III) Beneficial Effects Compared with existing technologies, the technical solution of this invention involves power-on control of DC 270V grid power supply, detection of loose DC 270V grid cable, detection and control of DC 270V insulation, control of DC 270V power supply overload, and detection of 270V super state. This solution achieves safe and reliable application of DC 270V through perfect power-on and power-off control logic. Attached Figure Description

[0013] Figure 1 This is a block diagram of the DC 270V power grid topology structure of the present invention. Detailed Implementation

[0014] To make the objectives, contents, and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0015] To solve the above-mentioned technical problems, the present invention provides a special vehicle DC 270V power grid, which includes: a DC 270V power supply, a 270V supercapacitor, a medium and low voltage power distribution and safety protection device, and a circuit rotary connector. The 270V DC power supply is used for continuous power supply and includes a 270V generator and controller, as well as a power conversion device. The 270V generator and controller are used to convert mechanical energy into electrical energy, realize voltage regulation control, and realize current limiting output, overcurrent, overvoltage, and overtemperature protection. The power conversion device is used to realize stable output of the 270V DC power supply through voltage conversion and has the functions of overcurrent, overvoltage, undervoltage, overtemperature, and hardware fault protection. The 270V supercapacitor serves as an energy storage power source, used to suppress fluctuations in the DC 270V grid voltage, playing a role in peak shaving and valley filling, and providing a stable voltage supply for DC 270V electrical equipment; the 270V supercapacitor is equipped with a charger inside, which, after low-voltage power-on, will realize the 270V supercapacitor and charge the 270V supercapacitor to 270V±2V. The medium and low voltage power distribution and safety protection device is used to realize DC 270V and DC 28V power distribution management; DC 270V power distribution management includes power-on pre-charge control, DC 270V power grid insulation detection, overcurrent protection of electrical equipment, and isolation protection after short circuit of electrical equipment; The lower rotating part of the circuit rotary connector is fixed to the chassis, while the upper rotating part rotates with the upper assembly without affecting the transmission of electrical signals; the circuit rotary connector is used to transmit the 270V power from the chassis to the upper assembly.

[0016] Furthermore, the present invention also provides a power-on / off control method for a special vehicle's DC 270V power grid. This power-on / off control method is implemented based on the special vehicle's DC 270V power grid and includes: The low-voltage power-on testing process for medium-voltage power distribution and safety protection devices is as follows: a) Low-voltage power-on testing of medium-voltage power distribution and safety protection devices When the low-voltage power supply is powered on, the medium-voltage power distribution and safety protection devices are tested for insulation resistance and cable loosening. If the insulation resistance of the DC 270V power grid is ≤150kΩ, a low insulation warning will be issued, and the DC 270V power supply will be prohibited from being powered on. If a loose cable is detected in the DC power grid, a cable loosening warning will be issued, and the DC 270V power supply will be prohibited from being powered on.

[0017] b) Detection of 270V supercapacitor power-on status After the 270V supercapacitor performs a low-voltage power-on self-test, it will report its heartbeat and the status of the 270V supercapacitor main contactor to the upper left medium and low voltage power distribution device within 1 second.

[0018] c) Integration processing of medium-voltage power grid status The low-voltage power distribution device in the upper chassis performs comprehensive processing based on the insulation resistance group, the loosening status of the medium-voltage cable, and the self-test information of the low-voltage power distribution device, and sends the processing results to the medium-voltage power conversion device.

[0019] Upon receiving the medium-voltage power-on command and the medium-voltage power distribution device's power-on permission signal, the medium-voltage power conversion device increases the voltage from zero to 270V according to the equipment's voltage power-on slope and completes the pre-charging of the 270V supercapacitor.

[0020] The power-on / off control method further includes: protection and distribution control of the 270V DC power grid, specifically involving: 1) Operating modes and protection functions of 270V DC mains power supply a) Operating mode of DC 270V mains power supply The 270V DC power grid has two operating modes: constant voltage and constant current. According to the operating characteristics of the electrical equipment, the 270V DC generator and the 270V DC power converter operate in constant voltage mode, stabilizing the voltage through a 270V supercapacitor. In constant power mode, the 270V DC generator and the 270V DC power converter use a supercapacitor to supplement instantaneous power.

[0021] The operating modes and protection functions of the 270V DC mains power supply also include: b) Protection mode of 270V DC mains power supply The 270V DC power grid has overvoltage protection, overcurrent protection, and overtemperature protection; and it also has a derating operating mode.

[0022] 2) Operation of distribution protection for a 270V DC power grid The system includes insulation detection for distribution equipment and cable loosening detection for medium-voltage power grids, as well as overcurrent and short-circuit isolation protection for distribution branches; it also transmits distribution status information and protection information of distribution branches via a bus.

[0023] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A 270V DC power grid for special vehicles, characterized in that, The special vehicle DC 270V power grid includes: DC 270V power supply, 270V supercapacitor, medium and low voltage power distribution and safety protection devices, and circuit rotary connectors. The 270V DC power supply is used for continuous power supply and includes a 270V generator and controller, as well as a power conversion device. The 270V generator and controller are used to convert mechanical energy into electrical energy, realize voltage regulation control, and realize current limiting output, overcurrent, overvoltage, and overtemperature protection. The power conversion device is used to realize stable output of the 270V DC power supply through voltage conversion and has the functions of overcurrent, overvoltage, undervoltage, overtemperature, and hardware fault protection. The 270V supercapacitor serves as an energy storage power source, used to suppress fluctuations in the DC 270V grid voltage, playing a role in peak shaving and valley filling, and providing a stable voltage supply for DC 270V electrical equipment; the 270V supercapacitor is equipped with a charger inside, which, after low-voltage power-on, will realize the 270V supercapacitor and charge the 270V supercapacitor to 270V±2V. The medium and low voltage power distribution and safety protection device is used to realize DC 270V and DC 28V power distribution management; DC 270V power distribution management includes power-on pre-charge control, DC 270V power grid insulation detection, overcurrent protection of electrical equipment, and isolation protection after short circuit of electrical equipment; The lower rotating part of the circuit rotary connector is fixed to the chassis, while the upper rotating part rotates with the upper assembly without affecting the transmission of electrical signals; the circuit rotary connector is used to transmit the 270V power from the chassis to the upper assembly.

2. A method for controlling the power supply and de-energization of a 270V DC power grid for special vehicles, characterized in that, The power-on / off control method is implemented based on the special vehicle DC 270V power grid as described in claim 1, and the power-on / off control method includes: The low-voltage power-on testing process for medium-voltage power distribution and safety protection devices is as follows: a) Low-voltage power-on testing of medium-voltage power distribution and safety protection devices When the low-voltage power supply is powered on, the medium-voltage power distribution and safety protection devices are tested for insulation resistance and cable loosening. If the insulation resistance of the DC 270V power grid is ≤150kΩ, a low insulation warning will be issued, and the DC 270V power supply will be prohibited from being powered on. If a loose cable is detected in the DC power grid, a cable loosening warning will be issued, and the DC 270V power supply will be prohibited from being powered on.

3. The power-on / off control method for a special vehicle's 270V DC power grid as described in claim 2, characterized in that, The power-on / off control method further includes: b) Detection of 270V supercapacitor power-on status After the 270V supercapacitor performs a low-voltage power-on self-test, it will report its heartbeat and the status of the 270V supercapacitor main contactor to the upper left medium and low voltage power distribution device within 1 second.

4. The power-on / off control method for a special vehicle's 270V DC power grid as described in claim 3, characterized in that, The power-on / off control method further includes: c) Integration processing of medium-voltage power grid status The low-voltage power distribution device in the upper chassis performs comprehensive processing based on the insulation resistance group, the loosening status of the medium-voltage cable, and the self-test information of the low-voltage power distribution device, and sends the processing results to the medium-voltage power conversion device.

5. The power-on / off control method for a special vehicle's 270V DC power grid as described in claim 4, characterized in that, The power-on / off control method further includes: d) Medium voltage power-on Upon receiving the medium-voltage power-on command and the medium-voltage power distribution device's power-on permission signal, the medium-voltage power conversion device increases the voltage from zero to 270V according to the equipment's voltage power-on slope and completes the pre-charging of the 270V supercapacitor.

6. The power-on / off control method for a special vehicle's 270V DC power grid as described in claim 5, characterized in that, The power-on / off control method also includes: protection and distribution control of the 270V DC power grid, specifically involving: 1) Operating modes and protection functions of 270V DC mains power supply a) Operating mode of DC 270V mains power supply The 270V DC power grid has two operating modes: constant voltage and constant current. According to the operating characteristics of the electrical equipment, the 270V DC generator and the 270V DC power converter operate in constant voltage mode, stabilizing the voltage through a 270V supercapacitor. In constant power mode, the 270V DC generator and the 270V DC power converter use a supercapacitor to supplement instantaneous power.

7. The power-on / off control method for a special vehicle's 270V DC power grid as described in claim 6, characterized in that, The operating modes and protection functions of the 270V DC mains power supply also include: b) Protection mode of 270V DC mains power supply The 270V DC power grid has overvoltage protection, overcurrent protection, and overtemperature protection; and it also has a derating operating mode.

8. The power-on / off control method for a special vehicle's 270V DC power grid as described in claim 5, characterized in that, The power-on / off control method also includes: protection and distribution control of the 270V DC power grid, specifically involving: 2) Operation of distribution protection for a 270V DC power grid The system includes insulation detection for distribution equipment and cable loosening detection for medium-voltage power grids, as well as overcurrent and short-circuit isolation protection for distribution branches; it also transmits distribution status information and protection information of distribution branches via a bus.

9. The power-on / off control method for a special vehicle's 270V DC power grid as described in claim 5, characterized in that, The method described belongs to the field of automatic control technology.

10. The power-on / off control method for a special vehicle's 270V DC power grid as described in claim 5, characterized in that, The method enables the safe application of DC 270V power supply while meeting the power requirements of electrically operated equipment.

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