Power supply system for construction workboat

Abstract

The utility model discloses a power supply system for a construction workboat. A shore power taking module takes power from a high-voltage overhead line and provides a high-voltage power supply for the system; the power taking module is connected with one end of the cable through the pole-mounted circuit breaker; the other end of the cable is connected with a first substation on the ship. The first line measurement and control protection device is arranged at the pole-mounted circuit breaker and provides protection for a post-stage high-voltage bus of the pole-mounted circuit breaker. The on-board second line measurement and control protection device provides protection for the post-stage high-voltage bus of the first transformer substation; the first line measurement and control protection device and the second line measurement and control protection device are connected through optical fiber communication integrated in the cable, and line differential protection is achieved. The first substation is used for high-voltage power distribution and voltage conversion on the construction workboat and supplies power to high-voltage and low-voltage equipment on the construction workboat. The system can meet the high-power electricity demand of the ship.

Description

Technical Field

[0001] The present application belongs to the field of ship power supply technology, and specifically relates to a power supply system for a construction ship. Background Art

[0002] Hunan Province has a dense river network and a developed water system. The river channels are rich in sand and gravel resources, and the amount of sand dredging ships and river dredging projects is huge. At present, sand dredging ships mainly use fuel generators and diesel engines to directly drive to provide electricity and power for sand dredging operations. The production energy consumption is high, the operating energy efficiency is relatively low, and the environmental pollution is serious. The implementation of ship electric energy substitution can effectively reduce the energy consumption cost of ship operations, improve the economic benefits of operations, and reduce the exhaust emissions of ship generators. It is an effective means to promote the development of green water transportation and help achieve the "dual carbon" goals.

[0003] Limited by voltage safety standards, most current oil-to-electric conversions for sand dredging vessels rely on a mature, low-voltage 0.4kV transmission line. However, sand dredging vessels and river dredging vessels require 1,000-15,000kVA of power during operations. To address these high-power demands, research and exploration of high-voltage shore-to-ship power solutions is necessary. Utility Model Content

[0004] The purpose of this application is to provide a power supply system for a construction vessel that can meet the high-power electricity needs of the vessel.

[0005] The technical solutions provided in this application are:

[0006] A power supply system for a construction vessel, comprising a shore power part and an onboard part;

[0007] The shore power part includes a power supply module, a pole-mounted circuit breaker and a first line measurement, control and protection device;

[0008] The onboard part includes a first transformer substation and a second line measurement, control and protection device;

[0009] The power supply module is connected to the high-voltage overhead line and is used to draw power from the high-voltage overhead line to provide high-voltage power supply for the system;

[0010] The power taking module is connected to one end of the cable via a pole-mounted circuit breaker; the other end of the cable is connected to the first substation;

[0011] The pole-mounted circuit breaker is used for on-off control of the system's high-voltage power supply;

[0012] The first line measurement, control and protection device is arranged at the pole-mounted circuit breaker to provide protection for the high-voltage busbar behind the pole-mounted circuit breaker;

[0013] The first substation is set up on the construction ship and is used for high-voltage power distribution and voltage conversion on the construction ship to supply power to high and low voltage equipment on the construction ship;

[0014] The second line measurement, control and protection device is installed in the high-voltage incoming and outgoing line cabinet of the first substation on the construction ship to provide protection for the high-voltage busbar at the rear stage of the first substation;

[0015] The first line measurement and control protection device and the second line measurement and control protection device are connected via optical fiber communication integrated inside the cable to achieve line differential protection;

[0016] The high voltage is a voltage of 1000V or above, and the low voltage is a voltage of less than 1000V.

[0017] In a possible implementation, the shore power part further includes a second substation;

[0018] The input side of the second substation is connected to the outlet side of the pole-mounted circuit breaker, and the output side of the second substation is connected to the power supply end of the first line measurement, control and protection device to provide power for the first line measurement, control and protection device.

[0019] In a possible implementation, the power extraction module includes a T-contact.

[0020] In one possible implementation, the pole-mounted circuit breaker switch has a built-in current sensor, voltage transformer and controller for monitoring line current and voltage. When overvoltage, undervoltage, overcurrent or short circuit occurs, the controller automatically disconnects the pole-mounted circuit breaker.

[0021] In a possible implementation, the pole-mounted circuit breaker operating mechanism adopts a magnetic control mechanism, with an opening time of less than 10ms, zero closing bounce, small action dispersion, and high reliability.

[0022] In one possible implementation, the pole-mounted circuit breaker is equipped with a feeder terminal unit (FTU). The FTU has a reserved communication interface and is equipped with wireless (4G / 5G) and fiber-optic communication modules to enable remote communication, thereby enabling line monitoring and circuit breaker opening and closing control.

[0023] In one possible implementation, the cable is a rubber-sheathed, insulated, waterproof multi-core composite cable, integrating an optical fiber, three main conductors, a ground wire, and a control wire. The main conductor is provided with, from the inside out, a conductor non-metallic shielding layer, a main conductor insulation layer, an insulating non-metallic shielding layer, and an insulating composite metal shielding layer. Filling layers are provided between the various cables in the composite cable. All cables are provided, from the inside out, with an inner sheath, a Kevlar braided reinforcement layer, and an outer sheath.

[0024] In a possible implementation, the portion of the cable located on the water surface is laid using a buoy.

[0025] In a possible implementation, the cable onboard is laid based on a cable guide, and a roller-type cable guide is used to achieve the transition and support of the surface cable onboard.

[0026] In a possible implementation, the cable onboard portion is covered with a steel mesh sleeve, and a fixing structure is provided at the end of the steel mesh sleeve for fixing to the ship and dispersing the force on the cable.

[0027] In a possible implementation, an insulation monitoring device is provided on the low-voltage side of the transformer of the first substation, and a residual current detection device is provided on the outgoing line side of the low-voltage outgoing line cabinet of the first substation.

[0028] Beneficial effects: The present application provides a power supply system for construction vessels, which can draw power from the high-voltage distribution network lines on land and transmit the power to surface ships through movable cable channels. A first line measurement, control and protection device is set up in the land part, and a second line measurement, control and protection device is set up on the ship. The two are connected through optical fiber communication integrated in the cable to achieve line differential protection. A first substation is set up on the ship for high-voltage power distribution and for stepping down the high-voltage power supply to a low-voltage power supply to supply power to the high and low-voltage equipment on board. The solution provided by the present application can meet the high-power power demand of ships. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of an application example of the present application;

[0030] Figure 2 This is a schematic diagram of the protection installation in the embodiment of this application;

[0031] Figure 3 This is a schematic diagram of the structure of an embodiment of the present application;

[0032] Figure 4 Schematic diagram of the cable structure in an embodiment of the present application; wherein, 1-optical fiber unit, 2-main line conductor, 3-conductor non-metallic shielding layer, 4-main line insulation layer, 5-insulated non-metallic shielding layer, 6-insulated composite metal shielding layer, 7-filling layer, 8-control wire core unit, 9-ground wire core and sheath, 10-inner sheath, 11-Kevlar braided reinforcement layer, 12-outer sheath;

[0033] Figure 5 This is a structural block diagram of the first substation in the embodiment of this application;

[0034] Figure 6 This is a schematic diagram of the circuit structure of the first substation in an embodiment of the present application. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0036] It should be noted that terms such as "first" and "second" in the specification and claims of this application and the accompanying drawings are used solely to distinguish one entity or operation from another, and do not necessarily require or imply a specific relationship or order between these entities or operations. It should be understood that the terms "first" and "second" do not limit the quantity or order of execution, and the terms "first" and "second" do not necessarily define differences. It should be understood that the terms used in this manner are interchangeable where appropriate. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a list of elements includes not only those elements explicitly listed, but also other elements not explicitly listed, or elements inherent to such process, method, product, or apparatus. Without further limitation, the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising the elements.

[0037] In this application, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "center," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0038] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0039] Furthermore, the terms "installed," "disposed," "provided with," "connected," "connected," and "socketed" should be interpreted broadly. For example, "connected" can mean a fixed connection, a removable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediary, or an internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0040] Specific embodiments according to the present application will be described below with reference to the accompanying drawings.

[0041] This embodiment provides a power supply system for a construction vessel, including a shore power part and an onboard part;

[0042] The shore power part includes a power supply module, a pole-mounted circuit breaker, a second substation and a first line measurement, control and protection device;

[0043] The onboard part includes a first transformer substation and a second line measurement, control and protection device;

[0044] The power supply module is connected to the high-voltage overhead line and is used to draw power from the high-voltage overhead line to provide high-voltage power supply for the system;

[0045] The power taking module is connected to one end of the cable via a pole-mounted circuit breaker; the other end of the cable is connected to the first substation;

[0046] The pole-mounted circuit breaker is used for on-off control of the system's high-voltage power supply and load side protection;

[0047] The first line measurement, control and protection device is arranged at the pole-mounted circuit breaker to provide protection for the high-voltage busbar behind the pole-mounted circuit breaker;

[0048] The first substation is set up on the construction ship and is used for high-voltage power distribution and voltage conversion on the construction ship to supply power to high and low voltage equipment on the construction ship;

[0049] The second line measurement, control and protection device is installed in the high-voltage incoming and outgoing line cabinet of the first substation on the construction ship to provide protection for the high-voltage busbar at the rear stage of the first substation;

[0050] The first line measurement and control protection device is combined with the second line measurement and control protection device to realize line differential protection;

[0051] The high voltage is a voltage of 1000V or above, and the low voltage is a voltage of less than 1000V.

[0052] The above-mentioned solution of this application can draw power from the high-voltage distribution network on land and transmit the power to the surface ship through a movable cable channel. The first substation is installed on the ship to distribute high-voltage (e.g., 10kV) power and step down the high-voltage (e.g., 10kV) power supply to low-voltage (e.g., 0.4kV) power supply to power high and low-voltage equipment on board.

[0053] In some embodiments, the shore power portion further includes a second substation;

[0054] The input side of the second substation is connected to the outlet side of the pole-mounted circuit breaker, and the output side of the second substation is connected to the power supply end of the first line measurement, control and protection device to provide power for the first line measurement, control and protection device.

[0055] In some embodiments, the high voltage is 10 kV.

[0056] In some embodiments, the power extraction module includes a T-contact.

[0057] In this application, the high voltage power supply for the ship is taken from the high voltage dedicated overhead line, and a T-junction is selected near the operation area of ​​the construction ship as the boundary point between the shore power system and the distribution network system, such as Figure 1 shown.

[0058] In some embodiments, the pole-mounted circuit breaker is an outdoor high-voltage AC vacuum circuit breaker.

[0059] Due to the transportation difficulties and the shrinking coastline in the sand mining area, outdoor high-voltage AC vacuum circuit breakers are installed at the power supply point for shore power system power disconnection and load side protection.

[0060] In some embodiments, the pole-mounted circuit breaker switches incorporate precision current sensors and voltage transformers for monitoring line current and voltage, capturing transient fault characteristics. When overvoltage, undervoltage, overcurrent, or short circuit conditions occur, the controller automatically disconnects the pole-mounted circuit breaker, fulfilling measurement, protection, and metering functions. This enables accurate handling of single-phase grounding faults and supports line loss measurement. This deep integration of functional units delivers high precision and reliability.

[0061] In some embodiments, the pole-mounted circuit breaker operating mechanism adopts a magnetic control mechanism, with an opening time of less than 10ms, zero closing bounce, small action dispersion, and high reliability.

[0062] In some embodiments, the pole-mounted circuit breaker is equipped with a feeder terminal unit (FTU). The FTU has a reserved communication interface and is equipped with wireless communication (4G / 5G) and fiber optic communication modules to enable remote communication functions, thereby enabling line monitoring and circuit breaker opening and closing control.

[0063] In some embodiments, the first and second line measurement and control protection devices can utilize the PAC-8200 series line measurement and control protection devices. The PAC-8200 series line protection, measurement and control devices are suitable for optical fiber longitudinal differential protection and measurement and control of line intervals at voltage levels of 35 kV and below in systems with ungrounded neutral points, arc suppression coil-grounded systems, or low-resistance grounded systems. They offer protection functions such as overcurrent rapid-trip protection, zero-sequence overcurrent protection, longitudinal differential protection, overload protection, and zero-sequence voltage protection.

[0064] Since the high-voltage onboard cable path is complex and in a constantly moving state, the sheath and insulation layer are easily damaged, and there is a high possibility of grounding and short circuit failures.

[0065] like Figure 2 As shown, this application adopts the overall protection configuration scheme of "coordination of main and auxiliary protection, and multiple protection guarantees". The pole-mounted circuit breaker is equipped with a feeder terminal unit FTU, which is combined with the first line measurement and control protection device to achieve double protection. The FTU can provide conventional protection such as overcurrent, overvoltage, and grounding for the onboard high-voltage lines. In addition to providing conventional protection functions, the first line measurement and control protection device can also be combined with the second line measurement and control protection device synchronously configured with the high-voltage incoming and outgoing line cabinet of the first substation on the ship to achieve line differential protection. The second line measurement and control protection device also provides protection for the high-voltage busbar at the rear stage of the first substation.

[0066] This application supports a variety of conventional protections and single-phase grounding fault and optical differential protection functions by configuring local protection devices.

[0067] like Figure 3 As shown, in some embodiments, the pole-mounted circuit breaker is provided with a protection control box, and the first line measurement, control and protection device is installed in the protection control box.

[0068] The protection control box is also equipped with a protection control circuit and an uninterruptible power supply device UPS.

[0069] In some embodiments, the second line measurement, control and protection device is installed in the incoming line cabinet of the first substation.

[0070] In some embodiments, the second substation is a high voltage / 220V transformer, which can be connected to the power supply end of the air conditioning and auxiliary power of the first line measurement, control and protection device and the protection control box to provide power for the air conditioning and auxiliary power of the first line measurement, control and protection device and the protection control box.

[0071] The cable is connected from the pole-mounted circuit breaker outlet to the first substation on the construction ship. According to the power supply function requirements, the cable needs to have multiple functions such as power transmission, equipotential connection, communication and control signal transmission.

[0072] In some embodiments, the cable is a rubber sheathed insulated waterproof multi-core composite cable. Figure 4 As shown, the composite cable is integrated with an optical fiber (i.e. Figure 4 The fiber unit 1 consists of three main cables, a ground cable, and a control cable. The main cable conductor 2 is covered, from the inside out, with a conductor non-metallic shield 3, a main cable insulation layer 4, an insulating non-metallic shield 5, and an insulating composite metal shield 6. Filler layers 7 are placed between the various cables in this composite cable. All cables are covered, from the inside out, with an inner sheath 10, a Kevlar braid reinforcement layer 11, and an outer sheath 12.

[0073] Rubber-sheathed, insulated, waterproof, multi-core composite cables are primarily used in applications such as cranes and large mobile equipment. For example, the cable specifications are YEFR-8.7 / 15kV - 3*150+1*70+4*2.5+6F0 (optical cable), with multiple cores integrated into a single cable.

[0074] The rated voltage of the cable is: 8.5 / 15kV; the allowable long-term operating temperature of the cable conductor is: -25℃~90℃; the minimum bending radius of the cable is: not less than 12 times the outer diameter of the cable; the conductor is tinned soft copper conductor, which meets the requirements of GB / T3956-2008 standard; the insulation adopts semi-conductive conductor shield + ethylene rubber insulation + semi-conductive conductor shield; the outer metal composite braided insulated metal shield layer; the sheath: the inner and outer sheath layers are extruded with a black chlorinated polyethylene rubber mixture; the inner and outer sheaths are reinforced with a Kevlar braided layer.

[0075] In some embodiments, the cable uses a standardized aviation plug interface, which is dust-proof, moisture-proof, and loose-proof, and the connection operation is simple and convenient.

[0076] The cable's entire route from the pole-mounted circuit breaker outlet to the first substation on the construction vessel involves multiple laying methods: onshore, floating, and in the ship's hold. To prevent damage, protective measures were implemented at points prone to wear and stress along the cable route.

[0077] In some embodiments, the portion of the cable located on the water surface is laid using a buoy.

[0078] In some embodiments, the cable onboard installation is performed using a cable guide. A roller-type cable guide is used to facilitate the transition and support of the surface cable onto the vessel. The main frame of the cable guide is constructed of high-quality carbon steel, meeting the stress requirements for cable onboard support and ensuring that the supported cable does not deform. The cable guide is equipped with a cable roller made of insulating material to prevent damage to the cable sheath due to compression and hard friction during onboard installation. The cable guide is secured to the vessel by welding or bolts.

[0079] The cable onboard portion is covered with a steel mesh sleeve, and the end of the steel mesh sleeve is provided with a fixing structure for fixing to the ship and dispersing the force on the cable.

[0080] In some embodiments, the first substation and the second substation may be box-type substations.

[0081] In some embodiments, the first substation and the second substation may use ring network transformers or terminal transformers.

[0082] In some embodiments, the first substation uses a containerized transformer or a prefabricated cabin transformer, such as Figure 5 shown.

[0083] In some embodiments, the first substation is divided into three compartments: a high-voltage compartment, a transformer compartment, and a low-voltage compartment.

[0084] The high-voltage room is provided with a high-voltage incoming line cabinet, a high-voltage outgoing line cabinet, a high-voltage metering cabinet, and a high-voltage PT cabinet.

[0085] An oil-immersed transformer or a dry-type transformer is arranged in the transformer chamber.

[0086] The transformer adopts IT connection mode.

[0087] The low-voltage room is provided with a low-voltage incoming line cabinet, a low-voltage outgoing line cabinet and a capacitor compensation cabinet.

[0088] Among them, high-voltage switchgear, transformers, and low-voltage switchgear must all be CCS type-approved products that meet the specifications for ship electrical equipment.

[0089] Among them, the lines and switches in the high-voltage incoming line cabinet and the high-voltage outgoing line cabinet are connected to the second line measurement and control protection device (microcomputer protection), such as Figure 6 As shown, line measurement and control are realized.

[0090] In some embodiments, an insulation monitoring device is provided on the low-voltage side of the transformer of the first substation for detecting the insulation status of the low-voltage side of the transformer and performing protective actions or alarms when an abnormality is detected.

[0091] For example, the insulation monitoring device may be an AIM-T300 insulation monitoring device.

[0092] In some embodiments, a residual current detection device is provided on the outgoing side of the low-voltage outgoing cabinet, which is used to detect the residual current on the outgoing side of the low-voltage outgoing cabinet and perform protective action or alarm when an abnormality is detected.

[0093] Exemplarily, the residual current detection device includes a zero-sequence current transformer and a controller; the three phase lines on the outgoing line side of the low-voltage outgoing line cabinet are connected to the zero-sequence current transformer for detecting residual current; the output end of the zero-sequence current transformer is connected to the input end of the controller; the output end of the controller is connected to the control end of the corresponding switch in the low-voltage outgoing line cabinet, and when an abnormal residual current is detected, the corresponding switch is controlled to disconnect.

[0094] After adopting the oil-to-electricity solution of the present application, a construction vessel such as a dredging vessel can use a 10kV high-voltage electric motor to replace the original ship diesel engine to drive the 2500kW sand suction pump on the ship.

[0095] The motor inverter can be in the form of a high-voltage cascade inverter with a rated capacity of 3150kVA, an adapted motor power of 2500kW, a rated input voltage and an output voltage of high voltage such as 10kV, a rated current of 182A, an inverter efficiency of 98%, and a power factor of ≥0.96%.

[0096] The above description of the embodiments of the present application is only a partial embodiment of the present application, which is used to enable professionals in this field to implement or use the contents of the present application, and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A power supply system for a construction vessel, characterized in that: Including shore power part and onboard part; The shore power part includes a power supply module, a pole-mounted circuit breaker and a first line measurement, control and protection device; The onboard part includes a first transformer substation and a second line measurement, control and protection device; The power supply module is connected to the high-voltage overhead line and is used to draw power from the high-voltage overhead line to provide high-voltage power supply for the system; The power taking module is connected to one end of the cable via a pole-mounted circuit breaker; the other end of the cable is connected to the first substation; The pole-mounted circuit breaker is used for on-off control of the system's high-voltage power supply; The first line measurement, control and protection device is arranged at the pole-mounted circuit breaker to provide protection for the high-voltage busbar behind the pole-mounted circuit breaker; The first substation is set up on the construction ship and is used for high-voltage power distribution and voltage conversion on the construction ship to supply power to high and low voltage equipment on the construction ship; The second line measurement, control and protection device is installed in the high-voltage incoming and outgoing line cabinet of the first substation on the construction ship to provide protection for the high-voltage busbar at the rear stage of the first substation; The first line measurement and control protection device and the second line measurement and control protection device are connected via optical fiber communication integrated inside the cable to achieve line differential protection; The high voltage is a voltage of 1000V or above, and the low voltage is a voltage of less than 1000V.

2. The system according to claim 1, wherein: The shore power section also includes a second substation; The input side of the second substation is connected to the outlet side of the pole-mounted circuit breaker, and the output side of the second substation is connected to the power supply end of the first line measurement, control and protection device to provide power for the first line measurement, control and protection device.

3. The system according to claim 1, wherein: The power taking module includes a T-contact.

4. The system according to claim 1, wherein: The pole-mounted circuit breaker switch has built-in current sensors, voltage transformers and controllers for monitoring line current and voltage. When overvoltage, undervoltage, overcurrent or short circuit occurs, the controller automatically disconnects the pole-mounted circuit breaker.

5. The system according to claim 1, wherein: The pole-mounted circuit breaker is equipped with a feeder terminal unit FTU; the FTU has a reserved communication interface and is provided with wireless communication and optical fiber communication modules.

6. The system according to claim 1, wherein: The cable uses a rubber sheathed insulated waterproof multi-core composite cable, which integrates an optical fiber, three main lines, a ground wire and a control line; the main line conductor is provided with a conductor non-metallic shielding layer, a main line insulation layer, an insulating non-metallic shielding layer and an insulating composite metal shielding layer from the inside to the outside; a filling layer is provided between different cables in the composite cable; all cables are provided with an inner sheath, a Kevlar braided reinforcement layer and an outer sheath from the inside to the outside.

7. The system according to claim 1, wherein: The portion of the cable located on the water surface is laid using a buoy.

8. The system according to claim 1, wherein: The cable onboard portion is laid based on a cable guide.

9. The system according to claim 1, wherein: The cable onboard portion is covered with a steel mesh sleeve, and the end of the steel mesh sleeve is provided with a fixing structure for fixing to the ship and dispersing the force on the cable.

10. The system according to any one of claims 1 to 9, characterized in that: An insulation monitoring device is provided on the low-voltage side of the transformer of the first substation, and a residual current detection device is provided on the outgoing line side of the low-voltage outgoing line cabinet of the first substation.

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