Power supply and distribution system of high-power marine fracturing equipment

Abstract

The invention discloses a power supply and distribution system of fracturing equipment for a high-power ship. The power supply and distribution system comprises a distributed medium-voltage generator set, a medium-voltage power distribution subsystem, a first low-voltage power distribution subsystem and a second low-voltage power distribution subsystem, the input end of the medium-voltage power distribution subsystem is electrically connected with a distributed medium-voltage generator set, the output end of the high-pulse phase-shifting medium-voltage transformer is used for supplying power to a fracturing pump skid driving system, one output end of the medium-pulse phase-shifting medium-voltage transformer is used for supplying power to marine equipment, and the other output end of the medium-pulse phase-shifting medium-voltage transformer is electrically connected with the input end of the first low-voltage power distribution subsystem. One output end of the first low-voltage power distribution subsystem is used for supplying power to fracturing operation equipment, the other output end of the first low-voltage power distribution subsystem is output to the second low-voltage power distribution subsystem through transformation of the low-pulse low-voltage transformer, and the output end of the second low-voltage power distribution subsystem is used for assisting in supplying power to the fracturing equipment. Through a power supply and distribution system which is highly integrated and high in redundancy, sufficient energy support is provided for high-power offshore fracturing equipment, and the risk handling capacity of the marine fracturing equipment and the operation toughness of a fracturing ship microgrid are greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of oil and gas production enhancement operations in oil and gas fields. More specifically, the present invention relates to a power supply and distribution system for high-power marine fracturing equipment. Background Art

[0002] In offshore low-permeability oil and gas fields, the productivity of some wells is insufficient. Abundant oil and gas resources urgently require high-power pressure drive technology to solve the stable production and production increase of the production oilfield, improve the well control reserves, cumulative production and overall recovery rate of single wells. Different from the large-scale electric fracturing operation mode on land, offshore electric pressure drive operations are restricted by the site area and power supply. How to avoid the situation of the fracturing technology being unsuitable for offshore applications, based on the strong mobility characteristics of offshore ships, provides the possibility for the pressure drive technology to be applied from land to sea. In the limited space of the ship, based on a large number of high-power pressure drive electrical equipment, it is necessary to comprehensively consider the convenience of the design, installation and maintenance of the power supply and distribution system, as well as the safety of the system. Building a highly integrated and redundant power supply and distribution system is the key to the operation of the entire marine fracturing equipment. Summary of the Invention

[0003] The object of the present invention is to provide a power supply and distribution system for high-power marine fracturing equipment, which provides sufficient energy support for high-power offshore fracturing equipment through a highly integrated and redundant power supply and distribution system, and greatly improves the ability of marine fracturing equipment to cope with risks and the resilience of the microgrid operation of the fracturing ship.

[0004] The technical solution adopted by the present invention to solve this technical problem is: to provide a power supply and distribution system for high-power marine fracturing equipment, including:

[0005] Multiple distributed medium-voltage generator sets;

[0006] Multiple medium-voltage power distribution subsystems, the input end of each medium-voltage power distribution subsystem is electrically connected to the output end of a distributed medium-voltage generator set. The medium-voltage power distribution subsystem includes a high-pulse-shifted medium-voltage transformer and a medium-pulse-shifted medium-voltage transformer. The output end of the high-pulse-shifted medium-voltage transformer is used to supply power to the fracturing pump skid drive system. The medium-pulse-shifted medium-voltage transformer has two output ends, and one of the output ends is used to supply power to marine equipment;

[0007] Multiple first low-voltage power distribution subsystems, the input end of each first low-voltage power distribution subsystem is electrically connected to the other output end of a medium-pulse-shifted medium-voltage transformer. The first low-voltage power distribution subsystem has two output ends, one of the output ends is used to supply power to the fracturing operation equipment, and the other output end is transformed and output through a low-pulse low-voltage transformer;

[0008] Multiple second low-voltage power distribution subsystems, where the low voltage value within each second low-voltage power distribution subsystem is less than the low voltage value within the first low-voltage power distribution subsystem. The input end of each second low-voltage power distribution subsystem is electrically connected to the output end of one of the low-pulse low-voltage transformers, and the output end of the second low-voltage power distribution subsystem is used to supply power to auxiliary fracturing equipment.

[0009] Preferably, in the power supply and distribution system of the high-power marine fracturing equipment, each of the medium-voltage power distribution subsystems further includes a medium-voltage busbar. The input end of the medium-voltage busbar is electrically connected to the output end of the distributed medium-voltage generator set. The medium-voltage busbar is provided with multiple output ends, one of which is electrically connected to the input end of the high-pulse phase-shifting medium-voltage transformer, and the other is electrically connected to the input end of the medium-pulse phase-shifting medium-voltage transformer;

[0010] Each pair of adjacent medium-voltage busbars is connected through a medium-voltage single-bus sectional circuit breaker to provide control and protection for the bus-coupling circuit between adjacent medium-voltage busbars.

[0011] Preferably, in the power supply and distribution system of the high-power marine fracturing equipment, each of the first low-voltage power distribution subsystems includes a first low-voltage busbar. The input end of the first low-voltage busbar is connected to the output end of the medium-pulse phase-shifting medium-voltage transformer. The first low-voltage busbar is provided with multiple output ends, one of which is used to supply power to the fracturing operation equipment, and the other is electrically connected to the input end of the low-pulse medium-voltage transformer;

[0012] Each pair of adjacent first low-voltage busbars is connected through a first low-voltage single-bus sectional circuit breaker to provide control and protection for the bus-coupling circuit between adjacent first low-voltage busbars.

[0013] Preferably, in the power supply and distribution system of the high-power marine fracturing equipment, each of the second low-voltage power distribution subsystems further includes a second low-voltage distribution panel. The input end of the second low-voltage distribution panel is electrically connected to the output end of the low-pulse low-voltage transformer. The second low-voltage distribution panel is provided with multiple output ends, one of which is used to supply power to the auxiliary fracturing equipment;

[0014] Each pair of adjacent second low-voltage distribution panels is connected through a second low-voltage single-bus sectional circuit breaker to provide control and protection for the bus-coupling circuit between adjacent second low-voltage distribution panels.

[0015] Preferably, in the power supply and distribution system of the high-power marine fracturing equipment, each of the medium-voltage power distribution subsystems further includes multiple medium-voltage frame circuit breakers. Medium-voltage frame circuit breakers are provided between the distributed medium-voltage generator set and the medium-voltage busbar, between the medium-voltage busbar and the high-pulse phase-shifting medium-voltage transformer, and between the medium-voltage busbar and the medium-pulse phase-shifting medium-voltage transformer;

[0016] Each of the first low-voltage power distribution subsystems further includes a plurality of first low-voltage frame circuit breakers. First low-voltage frame circuit breakers are provided between the medium-pulse phase-shifting medium-voltage transformer and the marine equipment, between the medium-pulse phase-shifting medium-voltage transformer and the first low-voltage busbar, between the first low-voltage busbar and the fracturing operation equipment, and between the first low-voltage busbar and the low-pulse low-voltage transformer.

[0017] Each of the second low-voltage power distribution subsystems further includes a plurality of second low-voltage molded case circuit breakers. Second low-voltage molded case circuit breakers are provided between the low-pulse low-voltage transformer and the second low-voltage switchboard, and between the second low-voltage switchboard and the auxiliary fracturing equipment.

[0018] Preferably, the power supply and distribution system of the high-power marine fracturing equipment further includes a remote monitoring platform.

[0019] The remote monitoring platform remotely monitors the opening and closing states of the medium-voltage frame circuit breakers and the first low-voltage frame circuit breakers through a communication network. Based on a preset load balancing algorithm, it sends remote closing instructions through the communication network to close the medium-voltage frame circuit breakers and the first low-voltage frame circuit breakers that need to be closed. At the same time, it controls all the medium-voltage frame circuit breakers and the first low-voltage frame circuit breakers to remotely trip through hardwiring.

[0020] Preferably, the power supply and distribution system of the high-power marine fracturing equipment further includes an uninterruptible power supply. The uninterruptible power supply is electrically connected to the remote control platform to continuously supply power to the remote operation platform.

[0021] Preferably, in the power supply and distribution system of the high-power marine fracturing equipment, the number of pulses of the high-pulse phase-shifting medium-voltage transformer is 24 pulses, the number of pulses of the medium-pulse phase-shifting medium-voltage transformer is 12 pulses, and the number of pulses of the low-pulse low-voltage transformer is 6 pulses.

[0022] Preferably, in the power supply and distribution system of the high-power marine fracturing equipment, the medium-voltage value in the medium-voltage power distribution subsystem is 6.6 kV, the low-voltage value in the first low-voltage power distribution subsystem is 400 V, and the low-voltage value in the second low-voltage power distribution subsystem is 230 V.

[0023] The present invention has at least the following beneficial effects:

[0024] 1. It has a multi-power single-busbar sectionalized input interlocking power supply system. Utilizing the fast support characteristic of the electric energy of the distributed medium-voltage generating sets, it can quickly reconstruct the medium-voltage power supply and distribution network, improve the ability of the medium-voltage generating sets on the ship to cope with sudden failures, and ensure the resilience of the fracturing system operation.

[0025] 2. It has a redundant guarantee system for the low-voltage power supply circuit, strengthens the anti-risk ability of the operation of the auxiliary fracturing equipment of the system, and improves the stability of the operation of the auxiliary fracturing equipment.

[0026] 3. A remote power supply status monitoring system based on an uninterruptible power supply can remotely monitor the status of the main frame circuit breaker and perform remote opening and closing control.

[0027] Other advantages, objectives, and features of the present invention will be partially reflected by the following description and partially understood by those skilled in the art through the research and practice of the present invention. Brief Description of the Drawings

[0028] Figure 1 It is a schematic diagram of the power supply and distribution system of a high-power marine fracturing device according to the present invention. Detailed Embodiments

[0029] The present invention will be described in detail and completely below in conjunction with the drawings. Those of ordinary skill in the art will be able to implement the present invention based on these descriptions. Before describing the present invention in conjunction with the drawings, it should be particularly noted that: the technical solutions and technical features provided in each part including the following description of the present invention can be combined with each other without conflict.

[0030] In addition, the embodiments of the present invention involved in the following description are usually only a part of the embodiments of the present invention, rather than all the embodiments. Therefore, all other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts should fall within the protection scope of the present invention.

[0031] The present invention will be further described in detail below in conjunction with the drawings and embodiments, and the specific implementation process is as follows:

[0032] As Figure 1 shown, the present invention provides a power supply and distribution system for a high-power marine fracturing device, including:

[0033] Multiple distributed medium-voltage generator sets. In this embodiment, 5 distributed medium-voltage generator sets, DG1, DG2, DG3, DG4, and DG5, provide the total power supply for the marine fracturing device, that is, provide power for 5 sections of medium-voltage busbars;

[0034] Multiple medium-voltage distribution subsystems, the input end of each of the medium-voltage distribution subsystems is electrically connected to the output end of one of the distributed medium-voltage generator sets. The medium-voltage distribution subsystem includes a high-pulse-shift medium-voltage transformer and a medium-pulse-shift medium-voltage transformer. The output end of the high-pulse-shift medium-voltage transformer is used to supply power to the fracturing pump skid drive system. The medium-pulse-shift medium-voltage transformer has two output ends, and one of the output ends is used to supply power to marine equipment; in this embodiment, 5 high-pulse-shift medium-voltage transformers, T11, T21, T31, T41, and T51 respectively step down the medium voltage to the rated voltage required by the corresponding fracturing pump skid drive system. That is, these five 24-pulse-shift transformers, T11, T21, T31, T41, and T51, have a primary rated voltage of 6.6 kV and can accept 6.6 kV high-voltage electrical energy from the distributed medium-voltage generator set. The secondary side is provided with 4 groups of output windings, and the output voltage of each group is 1800 V, and the electrical energy can be transmitted to the fracturing pump skid drive system at this voltage level; 5 medium-pulse medium-voltage transformers, T12, T22, T32, T42, and T52 respectively step down the medium voltage to the 400 V voltage required for supplying power to marine equipment and low-pressure fracturing operation equipment. That is, these five 12-pulse-shift transformers, T12, T22, T32, T42, and T52, have a primary rated voltage of 6.6 kV and can accept 6.6 kV high-voltage electrical energy from the distributed medium-voltage generator set. The secondary side is provided with 2 groups of output windings, and the output voltage of each group is 400 V, and the electrical energy can be transmitted to the first low-voltage distribution subsystem and marine equipment at this voltage level. The fracturing pump skid drive system is a key component in the fracturing operation, mainly used to provide power for the fracturing pump so that it can inject high-pressure liquid into the formation to achieve fracturing and production increase of the oil and gas reservoir.

[0035] Multiple first low-voltage distribution subsystems, the input end of each of the first low-voltage distribution subsystems is electrically connected to the other output end of one of the medium-pulse-shift medium-voltage transformers. The first low-voltage distribution subsystem has two output ends, one of the output ends is used to supply power to the fracturing operation equipment, and the other output end outputs through a low-pulse low-voltage transformer; in this embodiment, the fracturing operation equipment includes a mixing and blending system, a liquid addition system, a powder conveying system, a mixed acid system, a sand mixing system, a sand transportation system, etc.; 5 low-pulse low-voltage transformers, also known as 400V / 230V low-voltage transformers, T13, T23, T33, T43, and T53 respectively step down 400V to the 230V voltage required for auxiliary fracturing equipment.

[0036] Multiple second low-voltage power distribution subsystems, where the low-voltage value within the second low-voltage power distribution subsystem is less than the low-voltage value within the first low-voltage power distribution subsystem. The input end of each second low-voltage power distribution subsystem is electrically connected to the output end of one of the low-pulse low-voltage transformers, and the output end of the second low-voltage power distribution subsystem is used to supply power to auxiliary fracturing equipment. In this embodiment, the first low-voltage power distribution subsystem is a 400V low-voltage power distribution subsystem, that is, the low-voltage value within the first low-voltage power distribution subsystem is 400V, and the second low-voltage power distribution subsystem is a 230V low-voltage power distribution subsystem, that is, the low-voltage value within the second low-voltage power distribution subsystem is 230V.

[0037] Furthermore, in the power supply and distribution system of the high-power marine fracturing equipment, each of the medium-voltage power distribution subsystems further includes a medium-voltage busbar. The input end of the medium-voltage busbar is electrically connected to the output end of the distributed medium-voltage generator set. The medium-voltage busbar is provided with multiple output ends, one of which is electrically connected to the input end of the high-pulse phase-shifting medium-voltage transformer, and the other is electrically connected to the input end of the medium-pulse phase-shifting medium-voltage transformer; in this embodiment, for the 5 groups of medium-voltage busbars, BUS-A, BUS-B, BUS-C, BUS-D, and BUS-E, the rated voltage of each is 6.6kV, and the electric energy provided by the corresponding distributed medium-voltage generator set is distributed to the corresponding medium-voltage loads.

[0038] Each two adjacent medium-voltage busbars are connected through a medium-voltage single-bus sectional circuit breaker to provide control and protection for the bus-coupling circuit between adjacent medium-voltage busbars. In this embodiment, there are 8 medium-voltage single-bus sectional circuit breakers. Among them, ACB-AB1 and ACB-AB2 provide control and protection for the bus-coupling circuit between medium-voltage busbar BUS-A and medium-voltage busbar BUS-B; ACB-BC1 and ACB-BC2 provide control and protection for the bus-coupling circuit between medium-voltage busbar BUS-B and medium-voltage busbar BUS-C; ACB-CD1 and ACB-CD2 provide control and protection for the bus-coupling circuit between medium-voltage busbar BUS-C and medium-voltage busbar BUS-D; ACB-DE1 and ACB-DE2 provide control and protection for the bus-coupling circuit between medium-voltage busbar BUS-D and medium-voltage busbar BUS-E. The present invention can utilize the medium-voltage single-bus sectional circuit breaker to reconstruct the medium-voltage power supply and distribution network and establish a power distribution channel for the distributed generator set.

[0039] Further, in the power supply and distribution system of the high-power marine fracturing equipment, each of the first low-voltage power distribution subsystems includes a first low-voltage busbar. The input end of the first low-voltage busbar is connected to the output end of the medium-pulse phase-shifting medium-voltage transformer. The first low-voltage busbar is provided with multiple output ends. One output end is used to supply power to the fracturing operation equipment, and the other output end is electrically connected to the input end of the low-pulse medium-voltage transformer. In this embodiment, 5 groups of first low-voltage busbars, BUS-A1, BUS-B1, BUS-C1, BUS-D1, and BUS-E1, distribute the 400V power supplied by the corresponding medium-pulse medium-voltage transformer to the corresponding 400V low-voltage loads.

[0040] Each two adjacent first low-voltage busbars are connected through a first low-voltage single-bus sectional circuit breaker to provide control and protection for the bus tie circuit between adjacent first low-voltage busbars. In this embodiment, there are 4 first low-voltage single-bus sectional circuit breakers. Among them, ACB-AB3 provides control and protection for the bus tie circuit between the first low-voltage busbar BUS-A1 and the first low-voltage busbar BUS-B1; ACB-BC3 provides control and protection for the bus tie circuit between the first low-voltage busbar BUS-B1 and the first low-voltage busbar BUS-C1; ACB-CD3 provides control and protection for the bus tie circuit between the first low-voltage busbar BUS-C1 and the first low-voltage busbar BUS-D1; ACB-DE3 provides control and protection for the bus tie circuit between the first low-voltage busbar BUS-D1 and the first low-voltage busbar BUS-E1. The present invention can utilize the first low-voltage single-bus sectional circuit breaker to realize the independent or series operation of the first low-voltage single bus and establish a redundant protection system for the low-voltage power supply circuit.

[0041] Further, in the power supply and distribution system of the high-power marine fracturing equipment, each of the second low-voltage power distribution subsystems further includes a second low-voltage distribution panel. The input end of the second low-voltage distribution panel is electrically connected to the output end of the low-pulse low-voltage transformer. The second low-voltage distribution panel is provided with multiple output ends. One output end is used to supply power to the auxiliary fracturing equipment. In this embodiment, 5 groups of second low-voltage distribution panels, BUS-A2, BUS-B2, BUS-C2, BUS-D2, and BUS-E2, distribute the 230V power supplied by the corresponding low-pulse low-voltage transformer (400V / 230V low-voltage transformer) to the corresponding 230V low-voltage loads.

[0042] Each pair of adjacent second low-voltage switchboards is connected by a second low-voltage single-bus sectional breaker to provide control and protection for the bus-tie circuit between adjacent second low-voltage switchboards. In this embodiment, there are 3 second low-voltage single-bus sectional breakers. Among them, ACB-AB4 provides control and protection for the bus-tie circuit between second low-voltage switchboard BUS-A2 and second low-voltage switchboard BUS-B2; ACB-BC4 provides control and protection for the bus-tie circuit between second low-voltage switchboard BUS-B2 and second low-voltage switchboard BUS-C2; ACB-DE4 provides control and protection for the bus-tie circuit between second low-voltage switchboard BUS-D2 and second low-voltage switchboard BUS-E2.

[0043] Furthermore, in the power supply and distribution system of the high-power marine fracturing equipment, each of the medium-voltage sub-systems further includes a plurality of medium-voltage draw-out circuit breakers. Medium-voltage draw-out circuit breakers are provided between the distributed medium-voltage generator sets and the medium-voltage busbars, between the medium-voltage busbars and the high-pulse phase-shifted medium-voltage transformers, and between the medium-voltage busbars and the medium-pulse medium-voltage transformers. In this embodiment, there are 15 medium-voltage draw-out circuit breakers. Among them, ACB-A1, ACB-B2, ACB-C1, ACB-D1, and ACB-E1 mainly provide control and protection for the power supply circuit of the medium-voltage busbars; ACB-A2, ACB-B2, ACB-C2, ACB-D2, and ACB-E2 mainly provide control and protection for the primary power supply circuit of the high-pulse phase-shifted medium-voltage transformers; ACB-A3, ACB-B3, ACB-C3, ACB-D3, and ACB-E3 mainly provide control and protection for the primary power supply circuit of the medium-pulse phase-shifted medium-voltage transformers.

[0044] Each of the first low-voltage sub-systems further includes a plurality of first low-voltage draw-out circuit breakers. First low-voltage draw-out circuit breakers are provided between the medium-pulse medium-voltage transformers and marine equipment, between the medium-pulse phase-shifted medium-voltage transformers and the first low-voltage busbars, between the first low-voltage busbars and the fracturing operation equipment, and between the first low-voltage busbars and the low-pulse low-voltage transformers. In this embodiment, there are 20 low-voltage draw-out circuit breakers. Among them, ACB-A4, ACB-B4, ACB-C4, ACB-D4, and ACB-E4 mainly provide control and protection for the power supply circuit of marine equipment; ACB-A5, ACB-B5, ACB-C5, ACB-D5, and ACB-E5 mainly provide control and protection for the power supply circuit of the first low-voltage busbars; ACB-A6, ACB-B6, ACB-C6, ACB-D6, and ACB-E6 mainly provide control and protection for the power supply circuit of the fracturing operation equipment; ACB-A7, ACB-B7, ACB-C7, ACB-D7, and ACB-E7 mainly provide control and protection for the primary power supply circuit of the low-pulse low-voltage transformers.

[0045] Each of the second low-voltage power distribution subsystems further includes a plurality of second low-voltage molded case circuit breakers. Second low-voltage molded case circuit breakers are provided between the low-pulse low-voltage transformer and the second low-voltage distribution panel, and between the second low-voltage distribution panel and the auxiliary fracturing equipment. In this embodiment, there are 10 second low-voltage molded case circuit breakers, where ACB-A8, ACB-B8, ACB-C8, ACB-D8, and ACB-E8 mainly provide control and protection for the power supply circuit of the second low-voltage distribution panel; ACB-A9, ACB-B9, ACB-C9, ACB-D9, and ACB-E9 mainly provide control and protection for the power supply circuit of the auxiliary fracturing equipment.

[0046] Furthermore, the power supply and distribution system of the high-power marine fracturing equipment further includes a remote monitoring platform, which is PCR in this embodiment;

[0047] The remote monitoring platform remotely monitors the opening and closing states of the medium-voltage draw-out circuit breaker and the first low-voltage draw-out circuit breaker through a communication network. Based on a preset load balancing algorithm, it sends a remote closing instruction through the communication network to close the medium-voltage draw-out circuit breaker and the first low-voltage draw-out circuit breaker that need to be closed. At the same time, it controls all the medium-voltage draw-out circuit breakers and the first low-voltage draw-out circuit breakers to remotely trip through hard wiring. In this embodiment, a preferred implementation is that the communication network can be 4G / 5G or Ethernet.

[0048] Furthermore, the power supply and distribution system of the high-power marine fracturing equipment further includes an uninterruptible power supply, which is UPS in this embodiment. The uninterruptible power supply is electrically connected to the remote control platform to continuously supply power to the remote operation platform. When the power supply and distribution system encounters a power outage, this uninterruptible power supply supports the operation and maintenance personnel to view the real-time power supply status of the system through the remote control platform and can emergently disconnect the specified power supply circuit.

[0049] Furthermore, in the power supply and distribution system of the high-power marine fracturing equipment, the number of pulses of the high-pulse phase-shifted medium-voltage transformer is 24 pulses, the number of pulses of the medium-pulse phase-shifted medium-voltage transformer is 12 pulses, and the number of pulses of the low-pulse low-voltage transformer is 6 pulses. In this embodiment, the low-pulse low-voltage transformer is a 400V / 230V low-voltage transformer.

[0050] Furthermore, in the power supply and distribution system of the high-power marine fracturing equipment, the medium-voltage value in the medium-voltage power distribution subsystem is 6.6 kV, the low-voltage value in the first low-voltage power distribution subsystem is 400V, and the low-voltage value in the second low-voltage power distribution subsystem is 230V.

[0051] The present invention mainly uses five distributed medium-voltage generator sets as the medium-voltage output power source within the limited marine space. Multiple segments of medium-voltage busbars respectively distribute the power of the distributed medium-voltage generator sets to the medium-voltage load devices under each medium-voltage busbar. Among them, the medium-voltage busbar can either separately distribute electric energy to the fracturing pump skid drive system and the medium-voltage transformer load under this medium-voltage busbar, or, taking the medium-voltage single-bus sectional breaker as the medium, quickly support the adjacent medium-voltage busbar and provide power for it; each segment of the medium-voltage busbar respectively uses a 12-pulse phase-shifting medium-voltage transformer to step down the medium-voltage to 400V low voltage to provide power support for marine equipment and fracturing operation equipment. A group of 400V low-voltage windings on the secondary side of each 12-pulse phase-shifting medium-voltage transformer is connected to the 400V low-voltage busbar. Multiple segments of 400V low-voltage busbars respectively distribute the 400V low-voltage power to the fracturing operation equipment under each busbar. Among them, the 400V low-voltage busbar can either separately provide power for the fracturing operation equipment under this busbar, or quickly support the adjacent 400V low-voltage busbar through the 400V low-voltage single-bus sectional breaker between the 400V low-voltage busbars and provide power for it; similarly, the secondary side of the 400V / 230V low-voltage transformer under each segment of the 400V low-voltage busbar provides power for its corresponding 230V low-voltage distribution board. In addition to the above-mentioned hardware structure for power distribution, based on the communication network, the power supply and distribution system remotely monitors the opening and closing states of all medium-voltage draw-out circuit breakers and 400V low-voltage main draw-out circuit breakers through the remote host computer in the central control room, and can remotely close the corresponding draw-out circuit breakers at the same time. To improve the safety of system operation, it is considered that all medium-voltage draw-out circuit breakers and 400V low-voltage main draw-out circuit breakers can be remotely tripped through hardwiring.

[0052] Although the embodiments of the present invention have been disclosed as above, it is not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the embodiments shown and described here.

Claims

1. A power supply and distribution system for a high-power marine fracturing device, characterized in that, Including: Multiple distributed medium-voltage generator sets; Multiple medium-voltage power distribution subsystems, the input end of each of the medium-voltage power distribution subsystems is electrically connected to the output end of one of the distributed medium-voltage generator sets. The medium-voltage power distribution subsystem includes a high-pulse phase-shifting medium-voltage transformer and a medium-pulse phase-shifting medium-voltage transformer. The output end of the high-pulse phase-shifting medium-voltage transformer is used to supply power to the fracturing pump skid drive system. The medium-pulse phase-shifting medium-voltage transformer is provided with two output ends, and one of the output ends is used to supply power to marine equipment; Multiple first low-voltage power distribution subsystems, the input end of each of the first low-voltage power distribution subsystems is electrically connected to the other output end of one of the medium-pulse phase-shifting medium-voltage transformers. The first low-voltage power distribution subsystem is provided with two output ends, one of the output ends is used to supply power to fracturing operation equipment, and the other output end is output after being transformed by a low-pulse low-voltage transformer; Multiple second low-voltage power distribution subsystems, the low-voltage value in the second low-voltage power distribution subsystem is less than the low-voltage value in the first low-voltage power distribution subsystem. The input end of each of the second low-voltage power distribution subsystems is electrically connected to the output end of one of the low-pulse low-voltage transformers. The output end of the second low-voltage power distribution subsystem is used to supply power to auxiliary fracturing equipment.

2. The power supply and distribution system of the high-power marine fracturing equipment according to claim 1, characterized in that, Each of the medium-voltage power distribution subsystems further includes a medium-voltage busbar. The input end of the medium-voltage busbar is electrically connected to the output end of the distributed medium-voltage generator set. The medium-voltage busbar is provided with multiple output ends, one of the output ends is electrically connected to the input end of the high-pulse phase-shifting medium-voltage transformer, and the other output end is electrically connected to the input end of the medium-pulse phase-shifting medium-voltage transformer; Each two adjacent medium-voltage busbars are connected through a medium-voltage single-bus section breaker to provide control and protection for the bus-coupling circuit between adjacent medium-voltage busbars.

3. The power supply and distribution system of the high-power marine fracturing equipment according to claim 1, characterized in that, Each of the first low-voltage power distribution subsystems includes a first low-voltage busbar. The input end of the first low-voltage busbar is connected to the output end of the medium-pulse phase-shifting medium-voltage transformer. The first low-voltage busbar is provided with multiple output ends, one of the output ends is used to supply power to fracturing operation equipment, and the other output end is electrically connected to the input end of the low-pulse medium-voltage transformer; Each two adjacent first low-voltage busbars are connected through a first low-voltage single-bus section breaker to provide control and protection for the bus-coupling circuit between adjacent first low-voltage busbars.

4. The power supply and distribution system of the high-power marine fracturing equipment according to claim 1, characterized in that Each of the second low-voltage power distribution subsystems further includes a second low-voltage distribution panel. The input end of the second low-voltage distribution panel is electrically connected to the output end of the low-pulse low-voltage transformer. The second low-voltage distribution panel is provided with multiple output ends, one of the output ends is used to supply power to auxiliary fracturing equipment; Each two adjacent second low-voltage distribution panels are connected through a second low-voltage single-bus section breaker to provide control and protection for the bus-coupling circuit between adjacent second low-voltage distribution panels.

5. The power supply and distribution system of the high-power marine fracturing equipment according to claim 1, wherein Each of the medium-voltage power distribution subsystems further includes multiple medium-voltage frame circuit breakers. Medium-voltage frame circuit breakers are arranged between the distributed medium-voltage generator set and the medium-voltage busbar, between the medium-voltage busbar and the high-pulse phase-shifting medium-voltage transformer, and between the medium-voltage busbar and the medium-pulse phase-shifting medium-voltage transformer; Each of the first low-voltage power distribution subsystems further includes a plurality of first low-voltage frame circuit breakers, and first low-voltage frame circuit breakers are provided between the medium-pulse phase-shifting medium-voltage transformer and the marine equipment, between the medium-pulse phase-shifting medium-voltage transformer and the first low-voltage busbar, between the first low-voltage busbar and the fracturing operation equipment, and between the first low-voltage busbar and the low-pulse low-voltage transformer; Each of the second low-voltage power distribution subsystems further includes a plurality of second low-voltage molded case circuit breakers, and second low-voltage molded case circuit breakers are provided between the low-pulse low-voltage transformer and the second low-voltage distribution panel and between the second low-voltage distribution panel and the auxiliary fracturing equipment.

6. The power supply and distribution system of the high-power marine fracturing equipment according to claim 5, characterized in that, It further includes a remote monitoring platform; The remote monitoring platform remotely monitors the opening and closing states of the medium-voltage frame circuit breakers and the first low-voltage frame circuit breakers through a communication network, and based on a preset load balancing algorithm, sends remote closing instructions through the communication network to close the medium-voltage frame circuit breakers and the first low-voltage frame circuit breakers that need to be closed. At the same time, all the medium-voltage frame circuit breakers and the first low-voltage frame circuit breakers are remotely tripped through hardwiring control.

7. The power supply and distribution system of the high-power marine fracturing equipment according to claim 6, characterized in that, It further includes an uninterruptible power supply, and the uninterruptible power supply is electrically connected to the remote control platform to continuously supply power to the remote operation platform.

8. The power supply and distribution system of the high-power marine fracturing equipment according to any one of claims 1-5, characterized in that The number of pulses of the high-pulse phase-shifting medium-voltage transformer is 24 pulses, the number of pulses of the medium-pulse phase-shifting medium-voltage transformer is 12 pulses, and the number of pulses of the low-pulse low-voltage transformer is 6 pulses.

9. The power supply and distribution system of the high-power marine fracturing equipment according to claim 1, characterized in that, The medium-voltage value in the medium-voltage power distribution subsystem is 6.6 kV, the low-voltage value in the first low-voltage power distribution subsystem is 400 V, and the low-voltage value in the second low-voltage power distribution subsystem is 230 V.

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