Mobile shore power high-low voltage conversion device

Abstract

The invention belongs to the technical field of power supply conversion, and discloses a mobile shore power high-low voltage conversion device, the device comprises a mobile platform and a transformation conversion system carried on the mobile platform, the transformation conversion system comprises a high-voltage outgoing line cabinet, the high-voltage outgoing line cabinet is used for adjusting the voltage and frequency of an input power supply; the power supply input end of the high-voltage ring main unit is electrically connected with the power supply output end of the high-voltage outgoing line cabinet, and the high-voltage ring main unit distributes and switches the adjusted power supply; the power supply input end of the step-down transformer is electrically connected with the power supply output end of the high-voltage ring main unit, and the step-down transformer is used for carrying out step-down on the adjusted power supply and outputting a target power supply; and the power supply input end of the low-voltage switch cabinet is electrically connected with the power supply output end of the step-down transformer, and the low-voltage switch cabinet is used for controlling and distributing the target power supply. The flexibility of the mobile shore power high-low voltage conversion device is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of power conversion, and in particular relates to a mobile shore power high-low voltage conversion device. Background Art

[0002] The traditional terminal power supply system mainly uses 1000kVA and 800kVA high-voltage terminal shore power system power supply equipment. The circuit design and manufacturing of this equipment were originally designed according to the high-voltage ship connection solution.

[0003] At present, the electricity standard of ships arriving at the port is 400V / 50Hz or 440V / 60Hz, which is not suitable for the current high-voltage output interface and cannot meet the output capacity of the low-voltage 440V / 60Hz and 400V / 50Hz stable frequency and voltage power supplies, thereby reducing the utilization rate of the equipment. Summary of the invention

[0004] The purpose of the present invention is to provide a mobile shore power high-low voltage conversion device to solve the problem that the existing shore power system is not suitable for the current high-voltage output interface and cannot meet the output capacity of the low-voltage 440V / 60Hz and 400V / 50Hz stable frequency and voltage power supply, thereby reducing the utilization rate of the equipment.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: The present invention provides a mobile shore power high-low voltage conversion device, the device comprising: a mobile platform and a voltage conversion system mounted on the mobile platform, the voltage conversion system comprising: A high-voltage outlet cabinet, the power input end of which is used to connect to a high-voltage shore power supply, and the high-voltage outlet cabinet is used to adjust the voltage and frequency of the input power supply and output the adjusted power supply; A high-voltage ring network cabinet, wherein the power input end of the high-voltage ring network cabinet is electrically connected to the power output end of the high-voltage outlet cabinet, and the high-voltage ring network cabinet distributes and switches the adjusted power supply; A step-down transformer, wherein the power input end of the step-down transformer is electrically connected to the power output end of the high-voltage ring network cabinet, and the step-down transformer is used to step down the regulated power supply and output the target power supply; At least two low-voltage switch cabinets, the power input ends of the at least two low-voltage switch cabinets are electrically connected to the power output end of the step-down transformer, and the at least two low-voltage switch cabinets are used to control and distribute the target power supply.

[0006] Preferably, the mobile platform is a fuel-powered vehicle.

[0007] Preferably, an interlocking device is provided between the power input end of every two low-voltage switch cabinets and the power output end of the step-down transformer, and the interlocking device has a normally closed switch and a normally open switch, one end of the normally open switch and one end of the normally closed switch are both electrically connected to the power output end of the step-down transformer, and the other end of the normally open switch and the other end of the normally closed switch are respectively electrically connected to the power input end of every two low-voltage switch cabinets.

[0008] Preferably, the device further comprises: a low-voltage socket box, a power input terminal of the low-voltage socket box being electrically connected to a power output terminal of the low-voltage switch cabinet; and the low-voltage socket box comprises at least two low-voltage sockets.

[0009] Preferably, the device further comprises: a low voltage power supply cabinet and a control unit; The power input end of the low-voltage power supply cabinet is electrically connected to the power output end of the step-down transformer; The control unit is connected in series between the power input end of the low-voltage power supply cabinet and the power output end of the step-down transformer, and is used to connect the low-voltage power supply cabinet with the step-down transformer or cut off the connection between the low-voltage power supply cabinet and the step-down transformer.

[0010] Preferably, the control unit includes: a relay and a PLC controller, the switch end of the relay is connected in series between the power input end of the low-voltage power supply cabinet and the power output end of the step-down transformer, and the coil end of the relay is electrically connected to the control output end of the PLC controller.

[0011] Preferably, the low-voltage power supply cabinet includes: an AC-AC module and an AC-DC module, the input end of the AC-AC module serves as the power input end of the low-voltage power supply cabinet, the input end of the AC-DC module is electrically connected to the output end of the AC-AC module, the AC-DC module is used to output a low-voltage direct current voltage, and the AC-AC module is used to output a low-voltage alternating current voltage.

[0012] Preferably, the high-voltage outlet cabinet comprises: Master controller; A current detection module is electrically connected to the main controller and is used to detect the input current and output current of the high-voltage outlet cabinet; A voltage detection module is electrically connected to the main controller and is used to detect the input voltage and output voltage of the high-voltage outlet cabinet; A display module, electrically connected to the main controller, for visually displaying the input current and output current of the high-voltage outlet cabinet, as well as the input voltage and output voltage of the high-voltage outlet cabinet; The communication module is connected to the main controller for establishing a communication connection with a pre-configured remote terminal.

[0013] Beneficial effects: 1. The voltage conversion system of the present invention is mounted on a mobile platform, which facilitates the movement of the voltage conversion system and allows the voltage conversion system to be deployed at a desired location, thereby improving the flexibility of the mobile shore power high-low voltage conversion device; 2. The present invention can increase the output capacity of low-voltage 440V / 60Hz and 400V / 50Hz frequency-stabilized and voltage-stabilized power supplies, thereby improving the utilization rate of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings: Figure 1 It is an overall block diagram of a voltage conversion system of a mobile shore power high-low voltage conversion device provided in one embodiment of the present invention; Figure 2 It is a wiring diagram of a low-voltage socket box with three sockets and a low-voltage switch cabinet provided in one embodiment of the present invention; Figure 3 The present invention is a wiring diagram of a low-voltage socket box with four sockets and a low-voltage switch cabinet provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be briefly introduced below in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0016] Embodiment 1 Figure 1 1 is a flow chart of a mobile shore power high-low voltage conversion device provided by an embodiment of the present invention. Figure 1 As shown, this embodiment provides a mobile shore power high-low voltage conversion device, which includes: a mobile platform and a transformer conversion system mounted on the mobile platform, the mobile platform is a fuel vehicle, and the transformer conversion system can be moved to any place by the fuel vehicle, that is, the transformer conversion system can be deployed at a desired location, thereby improving the flexibility of the mobile shore power high-low voltage conversion device; the transformer conversion system includes: a high-voltage outlet cabinet, a high-voltage ring network cabinet, a step-down transformer and at least two low-voltage switch cabinets.

[0017] The power input terminal of the high-voltage outlet cabinet is used to connect to the high-voltage shore power supply, and the high-voltage outlet cabinet is used to adjust the voltage and frequency of the input power supply and output the adjusted power supply.

[0018] In this embodiment, the high-voltage outlet cabinet adopts a 10KV metal-clad center-mounted switch cabinet, cabinet type KYN28A-12, rated current 630A, rated short-circuit breaking current 25kA, and cabinet protection grade IP43.

[0019] The high-voltage outlet cabinet adopts a trolley-type high-voltage vacuum circuit breaker and a multi-stage protection integrated relay protection device with 485 communication function and electricity metering function. The protection functions include but are not limited to overcurrent, short circuit, overvoltage, undervoltage, reverse power, three-phase imbalance and other fault protections. The display and measurement functions include but are not limited to current, voltage, frequency, active power, reactive power, power factor, active electricity, reactive electricity, etc. The integrated relay protection device should be able to meet the relay protection, display and metering needs of both 50HZ and 60HZ power supplies.

[0020] The high-voltage distribution cabinet can realize two operation modes: local control and remote control. Local control means that the operator closes / opens the circuit breaker through the switch cabinet operation panel, and remote control means that the operator closes / opens the circuit breaker through the remote human-machine interface. Regardless of the operation mode, all operations are executed in local operation mode first.

[0021] Therefore, the high-voltage outlet cabinet includes: a main controller, a current detection module, a voltage detection module, a display module and a communication module. The communication module can use RS485 communication or wireless communication; wherein the main controller can be a PLC (Programmable Logic Controller) or a microcontroller such as a single-chip microcomputer; The current detection module is electrically connected to the main controller and is used to detect the input current and output current of the high-voltage outlet cabinet; The voltage detection module is electrically connected to the main controller and is used to detect the input voltage and output voltage of the high-voltage outlet cabinet; The display module is electrically connected to the main controller and is used to visually display the input current and output current of the high-voltage outlet cabinet, as well as the input voltage and output voltage of the high-voltage outlet cabinet; The communication module is connected to the main controller for establishing a communication connection with a pre-configured remote terminal, which may be a PC in the control room of the terminal, or a mobile phone, a mobile computer or other device.

[0022] The operation panel of the high-voltage distribution cabinet should be installed with but not limited to the following instruments, indicator lights and switches: comprehensive relay protection device, input and output high-voltage live indicator lights and voltage measurement port, three-phase mechanical ammeter, voltmeter, closing / opening switch and indicator light, energy storage switch and indicator light, operation module transfer switch, circuit breaker trolley position indicator light, grounding knife position indicator light, etc.

[0023] The data information uploaded by the high-voltage distribution cabinet includes but is not limited to various power data information, circuit breaker closing / opening information, circuit breaker energy storage information, circuit breaker trolley position information, grounding knife position information, etc.

[0024] Among them, the power input end of the high-voltage ring network cabinet is electrically connected to the power output end of the high-voltage outlet cabinet, and the high-voltage ring network cabinet distributes and switches the adjusted power supply.

[0025] Among them, the power input end of the step-down transformer is electrically connected to the power output end of the high-voltage ring network cabinet, and the step-down transformer is used to step down the regulated power supply and output the target power supply, and the output target power supply is 440V / 60Hz and 400V / 50Hz power supply; the present invention can increase the output capacity of low-voltage 440V / 60Hz and 400V / 50Hz frequency-stabilized and voltage-stabilized power supplies, thereby improving the utilization rate of the equipment; the product information of the step-down transformer of this embodiment is as follows: Standard: GB1094.11; Model: ZBSGB13 series or equivalent; Capacity: 800kVA, taking into account the capacity change at 50Hz / 60Hz output; Rated input voltage: 0.60kV (50Hz) / 0.69kV (60Hz); Rated output voltage: 0.4kV (50Hz) / 0.45kV (60Hz); Rated frequency: 50Hz / 60Hz; Wiring group: D, YN11, where D is 0.613kv (50Hz) or 0.69kv (60Hz), YN11 is 0.4kv (50Hz) or 0.45kv (60Hz); Tap: No tap; Insulation grade: H grade insulation; Average winding temperature rise of winding: 125k; Impedance voltage: 6% (50Hz); Protection grade: IP20; Insulation level: Rated power frequency withstand voltage insulation level 3kV (RMS value), rated impulse withstand voltage insulation level 0kV (peak value); Grounding: The secondary neutral point should be grounded; Shield: Primary and secondary application shield.

[0026] The power input ends of the at least two low-voltage switch cabinets are electrically connected to the power output end of the step-down transformer, and the at least two low-voltage switch cabinets are used to control and distribute the target power supply.

[0027] In this embodiment, an interlocking device is provided between the power input end of every two low-voltage switch cabinets and the power output end of the step-down transformer, and the interlocking device has a normally closed switch and a normally open switch, one end of the normally open switch and one end of the normally closed switch are both electrically connected to the power output end of the step-down transformer, and the other end of the normally open switch and the other end of the normally closed switch are respectively electrically connected to the power input end of every two low-voltage switch cabinets.

[0028] This embodiment takes two low-voltage switch cabinets as an example. The interlocker can be an interlocking relay or other equipment. When one switch is closed, the other switch is disconnected, and the two switches of the interlocker are in opposite states. At this time, there will be a low-voltage switch cabinet that is always connected to the power output end of the step-down transformer, which can form a form in which two groups of power supplies are powered at different times.

[0029] In this embodiment, the low-voltage switch cabinet uses a frame-drawable intelligent air circuit breaker. The circuit breaker body can be withdrawn when inspecting or connecting the shore power cable, meeting the safety operation specifications of permanent and complete electrical isolation. The low-voltage switch cabinet has the following electrical parameters: 1. The rated frame current of the circuit breaker of the pressure switch cabinet is 1600A, the trip setting current is 1600A (0.4~1 adjustable), the rated voltage is 690V, the rated operating short-circuit breaking capacity is 50KA, including the under-voltage release device; 2. The switchgear can centrally display and measure the power parameters such as three-phase line voltage, three-phase line current, three-phase line voltage average value, three-phase line current average value, output frequency, output power factor, active power, reactive power, active power measurement, reactive power measurement, etc. of low-voltage output, with a display and measurement accuracy of 0.5 level; 3. The main circuit of the high-voltage switch cabinet uses high-conductivity copper busbars with a copper purity of ≥99.9%, and is covered with PVC color-coded heat shrink tubing; each copper busbar is tinned throughout, and the cross-section is uniform throughout the entire length; its cross-section can carry continuous load current, and the copper busbar contacts should ensure effective conductivity and firm connection; the busbar is processed by special busbar processing equipment for bending, folding, punching, etc. After processing, the busbar should be smooth, without hammer marks, cracks, or burrs; 4. The switchgear can realize local / remote operation control, and the remote uploaded data information includes but is not limited to various power data information, circuit breaker closing / opening information, circuit breaker position information, etc.; 5. The switch cabinet reserves multiple output cable interfaces and spaces to meet the needs of low-voltage output cable connections.

[0030] As a further optimization of this embodiment, the device further includes: a low-voltage socket box, the power input end of the low-voltage socket box is electrically connected to the power output end of the low-voltage switch cabinet; the low-voltage socket box includes at least two low-voltage sockets; this embodiment preferably uses two low-voltage sockets, one of which is a 3-socket low-voltage socket and the other is a 4-socket low-voltage socket, and the two low-voltage sockets are equipped with emergency stop buttons; the wiring diagram between the power input end of the low-voltage socket box and the power output end of the low-voltage switch cabinet is as shown in Figure 2 and Figure 3 As shown; Figure 2 and Figure 3 On the left side are the wiring terminals of the power output end of the low-voltage switch cabinet. Figure 2 The right side is a 3-socket low-voltage socket. Figure 3 On the right side is a 4-socket low-voltage socket; Figure 2 In the example, XS1 is the 1# socket, XS2 is the 3# socket, XS3 is the 3# socket, ES is the emergency stop button (emergency stop), and HR is the indicator light; Figure 3 In the diagram, XS1 is the 1# socket, XS2 is the 3# socket, XS3 is the 3# socket, XS4 is the 4# socket, ES is the emergency stop button (emergency stop), and HR is the indicator light.

[0031] As a further optimization of this embodiment, the device further includes: a low-voltage power supply cabinet and a control unit; The power input end of the low-voltage power supply cabinet is electrically connected to the power output end of the step-down transformer; The control unit is connected in series between the power input end of the low-voltage power supply cabinet and the power output end of the step-down transformer, and is used to connect the low-voltage power supply cabinet with the step-down transformer or cut off the connection between the low-voltage power supply cabinet and the step-down transformer.

[0032] As a further optimization of this embodiment, the control unit includes: a relay and a PLC controller, the switch end of the relay is connected in series between the power input end of the low-voltage power supply cabinet and the power output end of the step-down transformer, and the coil end of the relay is electrically connected to the control output end of the PLC controller.

[0033] As a further optimization of this embodiment, the low-voltage power supply cabinet includes: an AC-AC module and an AC-DC module, the input end of the AC-AC module serves as the power input end of the low-voltage power supply cabinet, the input end of the AC-DC module is electrically connected to the output end of the AC-AC module, the AC-DC module is used to output a low-voltage direct current voltage, and the AC-AC module is used to output a low-voltage alternating current voltage.

[0034] Among them, the AC-AC module is used to convert AC 400V or AC 440V into AC 220V. The output voltage of the AC-AC module can provide AC power for high-voltage distribution board power supply, sockets, air conditioners, and lighting.

[0035] Among them, the AC-DC module is used to convert AC 220 V into DC 110 V, and the output voltage of the AC-DC module can provide DC power for DC devices.

[0036] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A mobile shore power high and low voltage conversion device, characterized in that: The device comprises: a mobile platform and a voltage conversion system mounted on the mobile platform, wherein the voltage conversion system comprises: A high-voltage outlet cabinet, the power input end of which is used to connect to a high-voltage shore power supply, and the high-voltage outlet cabinet is used to adjust the voltage and frequency of the input power supply and output the adjusted power supply; A high-voltage ring network cabinet, wherein the power input end of the high-voltage ring network cabinet is electrically connected to the power output end of the high-voltage outlet cabinet, and the high-voltage ring network cabinet distributes and switches the adjusted power supply; A step-down transformer, wherein the power input end of the step-down transformer is electrically connected to the power output end of the high-voltage ring network cabinet, and the step-down transformer is used to step down the regulated power supply and output the target power supply; At least two low-voltage switch cabinets, the power input ends of the at least two low-voltage switch cabinets are electrically connected to the power output end of the step-down transformer, and the at least two low-voltage switch cabinets are used to control and distribute the target power supply.

2. The mobile shore power high and low voltage conversion device according to claim 1 is characterized in that: The mobile platform is a fuel vehicle.

3. The mobile shore power high and low voltage conversion device according to claim 1 is characterized in that: An interlocking device is provided between the power input end of every two low-voltage switch cabinets and the power output end of the step-down transformer, and the interlocking device has a normally closed switch and a normally open switch, one end of the normally open switch and one end of the normally closed switch are both electrically connected to the power output end of the step-down transformer, and the other end of the normally open switch and the other end of the normally closed switch are respectively electrically connected to the power input end of every two low-voltage switch cabinets.

4. The mobile shore power high-low voltage conversion device according to claim 3 is characterized in that: The device further comprises: a low-voltage socket box, a power input end of the low-voltage socket box being electrically connected to a power output end of the low-voltage switch cabinet; and the low-voltage socket box comprises at least two low-voltage sockets.

5. The mobile shore power high-low voltage conversion device according to claim 3 is characterized in that: The device also includes: a low-voltage power supply cabinet and a control unit; The power input end of the low-voltage power supply cabinet is electrically connected to the power output end of the step-down transformer; The control unit is connected in series between the power input end of the low-voltage power supply cabinet and the power output end of the step-down transformer, and is used to connect the low-voltage power supply cabinet with the step-down transformer or cut off the connection between the low-voltage power supply cabinet and the step-down transformer.

6. The mobile shore power high-low voltage conversion device according to claim 5 is characterized in that: The control unit includes: a relay and a PLC controller, the switch end of the relay is connected in series between the power input end of the low-voltage power cabinet and the power output end of the step-down transformer, and the coil end of the relay is electrically connected to the control output end of the PLC controller.

7. The mobile shore power high-low voltage conversion device according to claim 5 is characterized in that: The low-voltage power supply cabinet includes: an AC-AC module and an AC-DC module, the input end of the AC-AC module serves as the power input end of the low-voltage power supply cabinet, the input end of the AC-DC module is electrically connected to the output end of the AC-AC module, the AC-DC module is used to output a low-voltage direct current voltage, and the AC-AC module is used to output a low-voltage alternating current voltage.

8. The mobile shore power high-low voltage conversion device according to claim 1 is characterized in that: The high-voltage outlet cabinet comprises: Master controller; A current detection module is electrically connected to the main controller and is used to detect the input current and output current of the high-voltage outlet cabinet; A voltage detection module is electrically connected to the main controller and is used to detect the input voltage and output voltage of the high-voltage outlet cabinet; A display module, electrically connected to the main controller, for visually displaying the input current and output current of the high-voltage outlet cabinet, as well as the input voltage and output voltage of the high-voltage outlet cabinet; The communication module is connected to the main controller for establishing a communication connection with a pre-configured remote terminal.

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