One-to-many shore power tapping system and power supply method thereof

Abstract

The present invention provides a one-to-many shore power tapping system, including a high-voltage bus, a variable frequency power supply, a transformer, and at least one shore power pile. The input end of the variable frequency power supply is connected to the high-voltage bus, and the output end is connected to the transformer. The transformer is connected to the shore power pile. A single shore power pile is connected to a low-voltage tapping box, and the low-voltage tapping box includes: a power intake port, a controller, a control switch, a current sensor, a power supply port, and a charging terminal. The present invention also provides a power supply method for a one-to-many shore power tapping system, which can expand the number of ships connected to the shore power pile, improve the utilization rate of shore power, and realize "the same shore power pile uses electricity, and different ships are billed in sections."

Description

Technical Field

[0001] The present invention relates to the technical field of electric power equipment, and in particular to a one-to-many shore power tapping system and a power supply method thereof, which are suitable for inland river anchoring areas. Background Art

[0002] When ships are sailing in the port area and at the port, they mainly use diesel generator sets (power generation) to meet the ship's electricity needs. The ships need to burn a large amount of ship fuel oil (heavy oil or diesel) when using their own diesel generator sets. While consuming diesel to obtain electricity, the ships also produce pollutant emissions. Zhejiang Province has the largest coastline in the country, about 6,600 kilometers, and is in a good position to connect international waterways and domestic feeder lines. There are many rivers and dense water networks in the province, which makes coastal and inland shipping trade increasingly prosperous. In 2015, the cargo throughput of ports in Zhejiang Province was 1.381 billion tons, of which the cargo throughput of coastal ports was 1.099 billion tons and the cargo throughput of inland ports was 282 million tons. The resulting ship emissions have an increasingly serious impact on the atmospheric environment. In addition, in addition to container ships and special ships, there are also many small ships and old ships. The common characteristics of these ships are small average tonnage, high energy consumption, and high pollution.

[0003] In recent years, the energy consumption and environmental pollution caused by ships docking at inland ports have become increasingly serious, and have become the focus of energy conservation and emission reduction in ports and anchorage areas. The Ministry of Transport has also clearly stated: "Actively promote the use of shore power by ships at berth, strive to build supporting equipment and facilities for ships at berth to use shore power, and achieve shore power use by ships at berth at international cruise terminals, major passenger terminals, major inland ports, and 30% of large container terminals and bulk cargo terminals."

[0004] Ship shore power refers to the use of land-based power sources instead of using the generators on board the ship during the period when the ship is docked. The inland anchorage service area is a public area that provides anchorage and comprehensive logistical services for ships traveling on inland waterways. It is characterized by a small shore power capacity and a small number of ships that can be docked. Usually, low-voltage integrated shore power pile equipment is installed in the service area for docked ships to use small-capacity shore power to provide living electricity for electrical facilities such as air conditioning and lighting on the ship. The shore power system in the service area is designed according to the maximum capacity of the ship, that is, the rated power of the shore power provided by a shore power pile = the rated power of a single generator on the ship, in order to meet the power needs of various electrical equipment on the ship; therefore, ships of different sizes require suitable shore power systems.

[0005] The existing shore power system mainly includes three parts: shore-based power supply equipment, shore-to-ship interface device, and onboard power receiving equipment. For ships moored in inland anchorage areas, a "point-to-point" power supply method is usually adopted, that is, power is output through the shore power pile installed on the shore (equivalent to the "shore-based power supply equipment"), and the power is input to the generator installed on the ship (equivalent to the "onboard power receiving equipment") through cables, and then the generator supplies power to various electrical facilities on the ship. The shortcomings of this solution are:

[0006] 1. The "point-to-point" power supply method determines that each shore power pile can only supply electricity to ships at one berth. In reality, there are often "many ships and few berths", which leads to ships having no choice but to choose the nearest shore power pile for electricity. Usually, the rated power of such shore power piles will be greater than the rated power of the ship's generator, thus resulting in insufficient electricity and idle shore power, and the power consumption rate of shore power piles is greatly reduced.

[0007] 2. In inland anchorage areas, a large number of ships are often stranded due to factors such as flood season or navigation closure. Due to limited berths in the service area, ships can only dock in overlapping rows, with a maximum of 3 to 4 rows. It usually takes a long time to wait for the turn to get electricity, making it difficult to stop the ship and time-consuming.

[0008] 3. Since the shore power supply must be connected to the cable, it is difficult to flexibly retract and release the cable for ships docked far away and special shore power boxes, and the operation is extremely inconvenient.

[0009] 4. The existing shore power access cable is not equipped with overcurrent protection. In the event of an accident, the power supply cannot be disconnected in time, which may easily cause a large current shock to the ship's power-receiving equipment, endangering personal safety and posing a safety hazard.

[0010] 5. The existing shore power charging pile has a single billing function and is not suitable for billing for power supply to multiple ships at the same time.

[0011] The Chinese invention patent with publication number CN 104485663A discloses a one-to-many shore power system, including a control module, a variable frequency power supply, multiple vacuum contactors and multiple information collection modules; wherein the number of vacuum contactors is the same as the number of information collection modules and corresponds one to one, the variable frequency power supply, multiple groups of vacuum contactors and multiple groups of information collection modules are all connected to the control module, each information collection module is sequentially connected to the power grid cable of each ship through a sampling line, and the corresponding ship power grid information is obtained in real time, and the control module controls the ships corresponding to the information collection modules to be connected to the grid in turn.

[0012] The Chinese invention patent with publication number CN 106410805A discloses a one-to-many ship shore power system and control method, wherein the ship shore power system includes: a high-voltage bus, a variable frequency power supply and multiple isolation control units; the isolation control unit includes an isolation transformer and a control switch, and the isolation transformer is connected to the control switch; the input end of the variable frequency power supply is connected to the high-voltage bus, and the output end of the variable frequency power supply is sequentially connected to the input end of multiple isolation control units; the variable frequency power supply is used to collect the voltage signal of the ship and determine the output voltage of the variable frequency power supply according to the voltage signal; the output end of the isolation control unit is used to supply power to the ship. The subsystem of the "one-to-many" power supply system involved in the patent is equipped with a full set of power transformation and distribution equipment in order to ensure seamless connection and disconnection. The disadvantages are: the cost is too high, the equipment is large in size, and it cannot be flexibly arranged. It does not meet the existing anchorage area. The ship's berthing time is not uniform and the low-voltage power consumption characteristics of inland ships are not met.

[0013] Although the technical solution of the above patent has achieved to a certain extent the connection of multiple ships to the shore power grid and the safe switching of shore power, its power supply principle is analyzed as follows: only the power supply end (i.e. the variable frequency power supply) adopts a branch line to connect to the grid for power supply, and after the power is input to the shore power pile, it is still one-to-one with the ship for power supply; therefore, the ship is still charged for electricity one-to-one at the shore power pile; it fails to realize the segmented power supply and time-sharing charging of multiple lines output from the shore power pile.

[0014] It can be seen that how to provide an adaptive shore power distribution system, flexibly arrange low-voltage distribution boxes under the condition of "many ships and few piles", which can not only expand the radiation range and number of connections of existing shore power piles, improve the efficiency of ship shore power connection, and reduce the power loss of shore power piles, but also allow users to charge reasonably according to actual use, time and line, provide necessary relay protection means, improve the efficiency of ship shore power connection and the utilization rate of shore power equipment, and reduce pollutant gas emissions, is a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0015] The object of the present invention is to provide a one-to-many shore power tapping system and a power supply method thereof, which integrates one-to-many power supply and segmented charging, and solves the above-mentioned defects in the prior art.

[0016] The technical solution adopted by the present invention is specifically as follows:

[0017] A one-to-many shore power tapping system includes a high-voltage bus, a variable frequency power supply, a transformer, and at least one shore power pile. The input end of the variable frequency power supply is connected to the high-voltage bus, and the output end is connected to the transformer. The transformer is connected to the shore power pile. A single shore power pile is connected to a low-voltage tapping box. The low-voltage tapping box includes:

[0018] The power supply port is connected to the output end of the shore power pile, used to select the branch for power supply and send the power consumption signal to the controller;

[0019] The controller is used to receive and process the power consumption signal, convert it into a power consumption instruction and send it to the control switch on the branch to control the power transmission of the branch;

[0020] The control switch is used to receive the control instructions from the controller and control the power on and off of the branch circuit;

[0021] A current sensor is connected to the control switch and is used to monitor the amount of electricity flowing through the branch;

[0022] A power supply port, one end of which is connected to the current sensor and the other end is connected to the input end of the ship's power receiving equipment for outputting power;

[0023] The charging end is connected to the controller and is used to convert the amount of electricity flowing through the branch into electricity charges and deduct fees;

[0024] The number of control switches, current sensors and power supply ports is the same, which is at least two.

[0025] Preferably, the controller includes a signal receiving end, a signal processing end and a signal transmitting end, wherein the signal receiving end is used to receive the power usage signal sent by the power port, the signal processing end is used to parse the power usage signal received by the signal receiving end and convert it into a control instruction for driving the control switch to power on; the signal transmitting end is used to feed back the control instruction converted by the signal processing end to the control switch.

[0026] Preferably, a receiving end and an on / off end are provided in the control switch, wherein the receiving end is used to receive control instructions fed back by the signal transmitting end, and the on / off end is used to control the power on and off of the branch.

[0027] Preferably, display screens are provided at both the power intake port and the charging terminal.

[0028] Preferably, the charging terminal is wirelessly connected to the mobile phone via a remote communication protocol.

[0029] Preferably, a first switch is provided between the high-voltage bus and the variable-frequency power supply, a second switch is provided between the variable-frequency power supply and the transformer, and a third switch is provided between the transformer and the shore power pile.

[0030] Preferably, a relay protection unit is provided on the current sensor.

[0031] In the present invention, the display screen is used to display information such as power consumption, corresponding electricity charges, and card balance; the relay protection unit is used for overcurrent protection and zero-sequence protection of the circuit; after electricity is used up, the user can deduct the charges through a mobile phone wirelessly connected to the charging end, or directly swipe the card at the charging end.

[0032] The present invention also provides a power supply method for a one-to-many shore power distribution system, comprising the following steps:

[0033] At least one ship's power grid is connected to the power supply port;

[0034] Obtain the voltage signal of the ship's power receiving equipment, adjust the output of the variable frequency power supply according to the voltage signal, and transmit it to the shore power pile through the transformer for power supply;

[0035] The user selects the branch where the power supply port is connected at the power port, sends a power usage instruction, and the power usage instruction is transmitted to the control switch through the controller, the corresponding branch is energized, and the power is output to the ship through the power supply port;

[0036] After finishing using electricity, the user sends a power-off command at the power outlet. The power-off command is transmitted to the control switch through the controller, and the corresponding branch is powered off, the power supply is stopped, and the power consumption and electricity fee are counted;

[0037] Users pay electricity bills at the charging station.

[0038] Preferably, when multiple ships are connected to each power supply port one by one, the user selects the corresponding power supply branch at the power outlet and draws electricity in sections; the current sensor of each branch counts the power consumption of the branch and sends it to the charging end; the charging end displays the electricity fee payment information of different branches and charges by time.

[0039] Preferably, the user pays the electricity fee via a mobile phone wirelessly connected to the charging terminal. In addition, the user can also directly swipe the card at the charging terminal to deduct the fee.

[0040] Compared with the prior art, the one-to-many shore power distribution system and power supply method provided by the present invention have the following beneficial effects:

[0041] 1. This system is designed based on the "one-to-many" power supply concept, so that the power output by the same shore power pile can provide power services for multiple ships at the same time, greatly improving the utilization rate of shore power and reducing the electricity costs of ship owners;

[0042] 2. The present invention takes into account various hidden dangers of electricity use in inland ports, and by arranging current sensors and relay protection units on each branch line, each section of the branch line is fully protected to improve the safety of electricity use.

[0043] 3. The charging terminal in the present invention can collect the power consumption, electricity charges and other information of each branch in sections, realizing "using the same shore power pile, and charging different ships in sections", ensuring that ship owners can use it with confidence and peace of mind. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a structural schematic diagram of the one-to-many shore power distribution system of the present invention.

[0045] Figure 2 It is a schematic diagram of the structure of the controller in the present invention.

[0046] Figure 3It is a structural schematic diagram of the control switch in the present invention. DETAILED DESCRIPTION

[0047] In order to make the technical personnel in the technical field better understand the scheme of the present invention, the technical scheme in the present embodiment will be specifically described below in conjunction with the drawings in the present invention. It must be noted that the following embodiments are only used to explain the present invention, rather than to limit the invention. Within the spirit of the present invention and the protection scope of the claims, any modifications and changes made to the present invention fall within the protection scope of the present invention.

[0048] like Figure 1 to Figure 3 As shown, a one-to-many shore power tapping system includes a high-voltage busbar 1, a variable frequency power supply 2, a transformer 3, and two shore power piles 4, wherein the input end of the variable frequency power supply 2 is connected to the high-voltage busbar 1, and the output end is connected to the transformer 3. The transformer 3 can be connected to multiple shore power piles 4 at the same time. The number of shore power piles 4 can be adjusted according to the actual situation of the inland river anchorage area, and can be one, three, four, etc. A first switch is provided between the high-voltage busbar 1 and the variable frequency power supply 2, a second switch is provided between the variable frequency power supply 2 and the transformer 3, and a third switch is provided between the transformer 3 and the shore power pile 4.

[0049] Shore power pile 4 is connected to a low voltage distribution box ( Figure 1 The low voltage distribution box includes: a power port 6, a controller 7, a control switch 8, a current sensor 9, a power supply port 10 and a charging terminal 5. The number of control switches 8, current sensors 9 and power supply ports 10 can be multiple at the same time, but they must be the same. The number of control switches 8, current sensors 9 and power supply ports 10 is adjusted according to the actual situation of the inland river anchorage area, and can be one, two, three, four, etc. The power port 6 and the charging terminal 5 are both equipped with display screens.

[0050] Specifically,

[0051] The power supply port 6 is connected to the output end of the shore power pile 4, and is used to select a branch for power supply and send a power consumption signal to the controller;

[0052] The controller 7 is used to receive and process the power consumption signal, convert it into a power consumption instruction and send it to the receiving end on the branch to control the power transmission of the branch;

[0053] The control switch 8 is used to receive the control instruction issued by the controller 7 and control the power on and off of the branch;

[0054] The current sensor 9 is connected to the control switch 8 and is used to monitor the amount of electricity flowing through the branch and for overcurrent protection. A single current sensor 9 is also provided with a relay protection unit for overcurrent protection and zero-sequence protection.

[0055] A power supply port 10, one end of which is connected to the current sensor 9, and the other end of which is connected to the input end of the ship's power receiving equipment, for outputting power;

[0056] The charging terminal 5 is connected to the controller 7 and is used to convert the amount of electricity flowing through the branch into electricity charges and deduct the charges.

[0057] In the present invention, the controller 7 includes a signal receiving end 701, a signal processing end 702 and a signal transmitting end 703, wherein the signal receiving end 701 is used to receive the power consumption signal sent by the power intake port 6, the signal processing end 702 is used to parse the power consumption signal received by the signal receiving end 701, and convert it into a control instruction for driving the control switch 8 to power on; the signal transmitting end 703 is used to feed back the control instruction converted by the signal processing end 702 to the control switch 8.

[0058] In the present invention, the control switch 8 is provided with a receiving end 8a and an opening and closing end 8b, wherein the receiving end 8a is used to receive the control instruction fed back by the signal transmitting end, and the opening and closing end 8b is used to control the power on and off of the branch.

[0059] The number of control switches 8, current sensors 9, and power supply ports 10 includes but is not limited to: Figure 1 In addition, there may be two, three, four, etc. When there are two, for the convenience of the following description, we name them as the first control switch 801 and the second control switch 802, the first current sensor 901 and the second current sensor 902, the first power supply port 1001 and the second power supply port 1002.

[0060] In the present invention, both the electricity taking port 6 and the charging terminal 11 are provided with display screens.

[0061] In the present invention, payment can be made by swiping a card at the charging terminal 5, or by using a mobile phone wirelessly connected to the charging terminal 5, for example, payment can be made through an account such as WeChat wallet or Alipay bound to the mobile phone.

[0062] The one-to-many shore power distribution system and power supply method provided by the present invention have the following working process:

[0063] First, the first ship enters the inland anchorage area and prepares to connect to electricity; first, the ship's power receiving equipment is connected to the first power supply port 1001 of the system with a cable and connected to the shore power grid; the system adjusts the output of the variable frequency power supply 2 according to the voltage signal of the ship's power receiving equipment, and transmits it to the shore power pile 4 through the transformer 3 for power supply; at this time, the user selects the branch where the first power supply port 1001 is located at the power supply port 6, swipes the card to draw electricity, and sends a power usage instruction; the power usage instruction is transmitted to the first control switch 801 through the controller 7, driving the branch to be energized, and the power is output to the first ship through the first power supply port 1001 for power supply;

[0064] After finishing using electricity, the user sends a power-off command at the power outlet 6, and the power-off command is transmitted to the first control switch 801 through the controller 7, driving the branch to cut off power and stop supplying power. The first current sensor 901 counts the power consumption and feeds the information back to the charging terminal 5. The display screen of the charging terminal 5 displays the power consumption time, power consumption, required electricity fee and other information of the ship, and the payment is completed.

[0065] When the first ship has not completed its electricity use, the second ship also enters the inland anchorage area and urgently needs to connect to electricity; similarly, the power receiving equipment of the second ship is connected to the second power supply port 1002, and the system automatically adjusts the power output of the power grid. The user can send a power use instruction at the power port 6 to supply power to the second ship; after the power is used up, a power-off instruction is sent at the power port 6 to stop the power supply and deduct the fee at the charging terminal 5.

[0066] In the present invention, under the premise of sufficient power supply from the shore power pile, multiple power supply ports 10 can be provided according to the upper limit of the load of the shore power pile. The power supply ports 10 charge the ships one by one, which greatly reduces the waiting time for charging.

Claims

1. A one-to-many shore power tapping system, comprising a high-voltage busbar (1), a variable frequency power supply (2), a transformer (3), and at least one shore power pile (4), wherein the input end of the variable frequency power supply (2) is connected to the high-voltage busbar (1), and the output end is connected to the transformer (3), and the transformer (3) is connected to the shore power pile (4), characterized in that: The single shore power pile (4) is connected to a low-voltage branch box, which includes: A power supply port (6) connected to the output end of the shore power pile (4) and used to select a branch for power supply and send a power consumption signal to a controller (7); A controller (7) is used to receive and process power consumption signals, convert them into power consumption instructions, and send them to a control switch (8) on a branch line to control power transmission of the branch line; A control switch (8) is used to receive a control instruction from the controller (7) and control the power on and off of the branch circuit; A current sensor (9), connected to the control switch (8), for monitoring the amount of electricity flowing through the branch; A power supply port (10), one end of which is connected to the current sensor (9) and the other end of which is connected to the input end of the ship's power receiving equipment, for outputting power; The charging terminal (5) is connected to the controller (7) and is used to convert the amount of electricity flowing through the branch into electricity charges and deduct fees; The control switch (8), current sensor (9) and power supply port (10) are provided in the same number, that is, at least two; The controller (7) comprises a signal receiving end (701), a signal processing end (702) and a signal transmitting end (703), wherein the signal receiving end (701) is used to receive the power usage signal sent by the power intake port (6), the signal processing end (702) is used to analyze the power usage signal received by the signal receiving end (701) and convert it into a control instruction for driving the control switch (8) to be powered on; the signal transmitting end (703) is used to feed back the control instruction converted by the signal processing end (702) to the control switch (8); The control switch (8) is provided with a receiving end (8a) and an on / off end (8b), wherein the receiving end (8a) is used to receive the control instruction fed back by the signal transmitting end (703), and the on / off end (8b) is used to control the power on and off of the branch; A first switch is provided between the high-voltage busbar (1) and the variable-frequency power supply (2), a second switch is provided between the variable-frequency power supply (2) and the transformer (3), and a third switch is provided between the transformer (3) and the shore power pile (4).

2. The one-to-many shore power tapping system according to claim 1 is characterized in that: The power intake port (6) and the charging terminal (5) are both provided with display screens.

3. The one-to-many shore power tapping system according to claim 1 is characterized in that: The charging terminal (5) is wirelessly connected to the mobile phone via a remote communication protocol.

4. The one-to-many shore power tapping system according to claim 1, characterized in that: The current sensor (9) is provided with a relay protection unit.

5. A power supply method for a one-to-many shore power distribution system according to any one of claims 1 to 4, comprising the following steps: At least one ship's power grid access power supply port (10); Obtaining a voltage signal from the ship's power receiving equipment, adjusting the output of the variable frequency power supply (2) according to the voltage signal, and transmitting the signal to the shore power pile (4) via the transformer (3) for power supply; The user selects the branch where the power supply port (10) is located at the power supply port (6) and sends a power usage instruction. The power usage instruction is transmitted to the control switch (8) via the controller (7), and the corresponding branch is energized, and the power is output to the ship through the power supply port (10); After finishing using electricity, the user sends a power-off command at the power outlet (6), and the power-off command is transmitted to the control switch (8) via the controller (7), and the corresponding branch is powered off, the power supply is stopped, and the power consumption and electricity charges are counted; The user pays the electricity fee at the charging terminal (5).

6. The power supply method of the one-to-many shore power distribution system according to claim 5, characterized in that: When multiple ships are connected to the power supply ports (10) one by one, the user selects the corresponding power supply branch at the power supply port (6) to draw power in sections; the current sensor (9) of each branch counts the power consumption of the branch and sends it to the charging terminal (5); the charging terminal (5) displays the electricity fee payment information of different branches and charges according to time.

7. The power supply method of the one-to-many shore power distribution system according to claim 5 or 6, characterized in that: The user pays the electricity bill via a mobile phone which is wirelessly connected to the charging terminal (5).

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