High-voltage power distribution system of offshore booster station

Abstract

The invention discloses a high-voltage power distribution system for an offshore booster station. The high-voltage power distribution system comprises n wire inlet cable units, (2n-1) wire outlet cable units and (2n-1) bus units, the incoming cable unit is used for transmitting electric energy to the outgoing cable unit through the bus unit; the outgoing cable unit is used for transmitting electric energy to a load end; the ith incoming cable unit is electrically connected with the (2i-1) th bus unit; the (2i-1) th bus unit is electrically connected with the (2i-1) th outlet cable unit; the 2i-th bus unit is electrically connected with the 2i-th outlet cable unit; and the (2i-2) th bus unit is electrically connected with the (2i-2) th outlet cable unit. According to the technical scheme, on the basis of ensuring the reliability of the whole station, the average distribution of electric energy is realized, the loss is reduced, and the number of electric parts of a power distribution system is reduced. Meanwhile, through permutation, combination and optimization of all components, the space, the weight and the cost of the offshore platform are saved to the maximum extent, and light weight of the offshore platform is promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power engineering, and in particular to a high-voltage power distribution system for an offshore booster station. Background Art

[0002] With the continuous expansion of offshore wind power, the number of transmission circuits is also increasing. At present, when the offshore wind power transmission capacity needs to be transmitted in three circuits, a wiring scheme of three main transformers is adopted, that is, one transformer corresponds to one incoming cable, and one incoming cable corresponds to one outgoing cable. On the one hand, three main transformers will cause a huge waste of offshore platform space; on the other hand, when each outgoing cable corresponds to one main transformer, since the three cables cannot play a role in complementing each other, as long as the wind power generation corresponding to the three main transformers is unbalanced, it is bound to cause one or two of the cables to fail to fully play their transmission capacity, thereby causing a waste of wind power resources. If the redundancy of the three transformers and cables is enlarged, it will cause a huge increase in investment in transformers and cables. Summary of the invention

[0003] The present invention provides a high-voltage power distribution system for an offshore booster station to solve the problems of redundant configuration of offshore platform equipment, excess space occupation, and waste of wind power resources in the prior art.

[0004] According to the present invention, a high-voltage power distribution system for an offshore substation is provided, comprising: n incoming cable units, 2n-1 outgoing cable units and 2n-1 busbar units; the incoming cable units are used to transmit electric energy to the outgoing cable units through the busbar units; the outgoing cable units are used to transmit electric energy to the load end; wherein n≥2 and n is an integer;

[0005] When i=1, the first incoming cable unit is electrically connected to the first bus unit; the first bus unit is electrically connected to the first outgoing cable unit; and is electrically connected to the second outgoing cable unit through the second bus unit;

[0006] When 1<i<n, the i-th incoming cable unit is electrically connected to the 2i-1th busbar unit; the 2i-1th busbar unit is electrically connected to the 2i-1th outgoing cable unit; and is electrically connected to the 2i-th outgoing cable unit through the 2i-th busbar unit; and is electrically connected to the 2i-2th outgoing cable unit through the 2i-2th busbar unit;

[0007] When i=n, ​​the nth incoming cable unit is electrically connected to the 2n-1th busbar unit; the 2n-1th busbar unit is electrically connected to the 2n-1th outgoing cable unit; and is electrically connected to the 2n-2th outgoing cable unit through the 2n-2 busbar unit; wherein 1≤i≤n, and i is an integer.

[0008] Optionally, the high-voltage power distribution system includes a first incoming cable unit, a second incoming cable unit, a first outgoing cable unit, a second outgoing cable unit, a third outgoing cable unit, a first busbar unit, a second busbar unit and a third busbar unit;

[0009] The first incoming cable unit is electrically connected to the first busbar unit; the first busbar unit is electrically connected to the first outgoing cable unit; and is electrically connected to the second outgoing cable unit through the second busbar unit; the second incoming cable unit is electrically connected to the third busbar unit; the third busbar unit is electrically connected to the third outgoing cable unit and is electrically connected to the second outgoing cable unit through the second busbar unit.

[0010] Optionally, the high voltage power distribution system further includes a circuit breaker and a disconnector;

[0011] A circuit breaker and two disconnectors are connected in series between the incoming cable unit and the outgoing cable unit, and the circuit breaker is arranged in series between the two disconnectors;

[0012] The circuit breaker is used to cut off the circuit between the incoming cable unit and the outgoing cable unit when the circuit current between the incoming cable unit and the outgoing cable unit is abnormal; the isolating switch is used to control the circuit between the incoming cable unit and the circuit breaker and / or the circuit between the outgoing cable unit and the circuit breaker to be disconnected after the circuit breaker is started.

[0013] Optionally, the high voltage power distribution system further comprises a current transformer;

[0014] The current transformer is arranged in series between the circuit breaker and the isolating switch to detect the loop current between the circuit breaker and the isolating switch.

[0015] Optionally, the circuit breaker, the current transformer and the isolating switch in the loop between the incoming cable unit and the outgoing cable unit are stacked along the first direction.

[0016] Optionally, the high voltage power distribution system further comprises a grounding switch;

[0017] The grounding switch is connected in parallel with the isolating switch and one end of the grounding switch is grounded.

[0018] Optionally, the high voltage power distribution system further comprises a voltage transformer;

[0019] One end of the voltage transformer is electrically connected to the incoming cable unit, and the other end is grounded; and the voltage transformer is connected in parallel with the outgoing cable unit to detect the loop voltage between the incoming cable unit and the outgoing cable unit.

[0020] Optionally, the high voltage power distribution system further includes a lightning arrester;

[0021] One end of the arrester is electrically connected to the incoming cable unit, and the other end is grounded; and it is connected in parallel with the outgoing cable unit to guide the overvoltage to discharge to the arrester and introduce the discharge current to the ground.

[0022] Optionally, the high-voltage power distribution system further includes a transformer; the transformer corresponds one-to-one to the incoming cable unit and is electrically connected.

[0023] The technical solution of the present invention determines the number of incoming cable units and busbar units when the number of outgoing cable units is determined, connects the incoming cable units to the outgoing cable units through the busbar units, and one incoming cable unit corresponds to multiple outgoing cable units, and adjacent incoming cable units are connected to the same outgoing cable unit through the busbar unit. This arrangement can realize that a few incoming cable units can transmit electric energy to most outgoing cable units, and on the basis of ensuring that the entire station will not be powered off due to any component failure, the average distribution of electric energy is achieved in the outgoing submarine cable, reducing losses and the number of corresponding transformers required. At the same time, by optimizing the arrangement and combination of various components, the space, weight and cost of the offshore platform are saved to the greatest extent, and the lightweight of the offshore platform is promoted.

[0024] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 is a wiring diagram of a first high-voltage power distribution system provided according to an embodiment of the present invention;

[0027] Figure 2 is a wiring diagram of a second high-voltage power distribution system provided according to an embodiment of the present invention;

[0028] Figure 3 This is a wiring diagram of the prior art provided according to an embodiment of the present invention;

[0029] Figure 4 is a schematic diagram of a planar structure of a high-voltage power distribution system provided according to an embodiment of the present invention;

[0030] Figure 5 is a schematic cross-sectional structural diagram of a first high-voltage power distribution system provided according to an embodiment of the present invention;

[0031] Figure 6 is a schematic cross-sectional structural diagram of a second high-voltage power distribution system provided according to an embodiment of the present invention;

[0032] Figure 7 It is a schematic cross-sectional structure diagram of a third high-voltage power distribution system provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below 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 of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0035] High-voltage power distribution systems can be used for the transmission and distribution of electricity, mainly for power transmission, substation and distribution. The transformer transmits electric energy to the incoming cable unit, and the incoming cable unit is then distributed to the outgoing cable unit through the aggregation of the busbar unit, and the outgoing cable unit transmits electric energy to the outside. In the prior art, when multiple output power is adopted, that is, multiple outgoing cable units are used to transmit electric energy, there is often a transformer, an incoming cable and an outgoing cable connected one by one. Since the power transmitted by the cable each time is fixed and can only transmit a part of the power of the transformer, this method will cause an increase in the number of transformers and an increase in cost, and the transformer will increase the space and weight of the offshore platform, causing huge waste; in addition, even if the number and specifications of wind turbines carried by each transformer are exactly the same, there will still be a situation where each wind turbine generates different power, which will cause the power output of each outgoing cable unit to be unevenly distributed, thereby causing a waste of submarine cable resources. Therefore, an embodiment of the present invention provides a high-voltage power distribution system, Figure 1 is a wiring diagram of a first high-voltage power distribution system provided according to an embodiment of the present invention, Figure 2 1 is a wiring diagram of a second high-voltage power distribution system provided according to an embodiment of the present invention. Figure 1 and Figure 2 As shown, the high voltage power distribution system includes:

[0036] n incoming cable units a, 2n-1 outgoing cable units b and 2n-1 busbar units c; the incoming cable unit a is used to transmit electric energy to the outgoing cable unit b through the busbar unit c; the outgoing cable unit b is used to transmit electric energy to the load end; wherein n≥2 and n is an integer;

[0037] When i=1, the first incoming cable unit a is electrically connected to the first bus unit c; the first bus unit c is electrically connected to the first outgoing cable unit b; and is electrically connected to the second outgoing cable unit b through the second bus unit c;

[0038] When 1<i<n, the i-th incoming cable unit a is electrically connected to the 2i-1th bus unit c; the 2i-1th bus unit c is electrically connected to the 2i-1th outgoing cable unit b; and is electrically connected to the 2i-th outgoing cable unit b through the 2i-th bus unit c; and is electrically connected to the 2i-2th outgoing cable unit b through the 2i-2th bus unit c;

[0039] When i=n, ​​the nth incoming cable unit a is electrically connected to the 2n-1th bus unit c; the 2n-1th bus unit c is electrically connected to the 2n-1th outgoing cable unit b; and is electrically connected to the 2n-2th outgoing cable unit b through the 2n-2 bus unit c; wherein 1≤i≤n, and i is an integer.

[0040] Among them, the high-voltage power distribution system in the embodiment of the present invention includes n incoming cable units a and 2n-1 outgoing cable units b. When the high-voltage power distribution system needs to adopt 3-way transmission, the outgoing cable units b are 3 and the incoming cable units a are 2, which correspond to 3 busbar units c; when the high-voltage power distribution system needs to adopt 5-way transmission, the outgoing cable units b are 5 and the incoming cable units a are 3, which correspond to 5 busbar units c. It can be understood that the quantitative relationship in the embodiment of the present invention is fixed, but the specific number of incoming cable units a, outgoing cable units b and busbar units c is not limited, and can be set according to the scale of offshore wind power. In some embodiments, the high-voltage power distribution system also includes a transformer; the transformer corresponds to the incoming cable unit a one-to-one and is electrically connected. By setting the quantitative relationship between the incoming cable unit a and the outgoing cable unit b, the number of transformers can be saved, thereby reducing the cost of the high-voltage power distribution system and ensuring the average distribution of electric energy.

[0041] Among them, n≥2 is defined in the embodiment of the present invention, the purpose of which is to define how the high-voltage power distribution system is set to ensure normal transmission of electric energy and reduce the space and weight of the offshore platform to save costs when the number of outgoing cable units b is greater than or equal to 3 and is an odd number.

[0042] Among them, one incoming cable unit a is connected to one bus unit c, one bus unit c is connected to one outgoing cable unit b and the adjacent bus unit c, and the adjacent bus unit c is connected to the corresponding outgoing cable unit b, ensuring that the bus unit c evenly divides and outputs the electrical energy of the outgoing cable unit b.

[0043] For example, Figure 1 The case shown is i=2, there are 2 incoming cable units a, 3 outgoing cable units b, 3 busbar units c, the first incoming cable unit a1 is electrically connected to the first busbar unit c1, the second incoming cable unit a2 is electrically connected to the third busbar unit c3, the first busbar unit c1 is electrically connected to the first outgoing cable unit b1 and the second busbar unit c2, the third busbar unit c3 is electrically connected to the second busbar unit c2 and the third outgoing cable unit b3, and the third busbar unit c3 is electrically connected to the third outgoing cable unit b3. This arrangement reduces the transformer corresponding to a group of incoming cable units a, saving space, weight and cost of the offshore platform; at the same time, the method of using 2 groups of incoming cable units a to correspond to 3 groups of outgoing cable units b reduces the problem of uneven distribution of electric energy and improves the utilization rate of submarine cable resources because a group of transformers is eliminated.

[0044] For example, Figure 2 The shown case is i=3, there are 3 incoming cable units a, 5 outgoing cable units b, and 5 busbar units c. The 1st incoming cable unit a1 is electrically connected to the 1st busbar unit c1, the 2nd incoming cable unit a2 is electrically connected to the 3rd busbar unit c3, the 1st incoming cable unit a1 is electrically connected to the 5th busbar unit c5, the 1st busbar unit c1 is electrically connected to the 1st outgoing cable unit b1 and the 2nd busbar unit c2, the 3rd busbar unit c3 is electrically connected to the 2nd busbar unit c2, the 3rd outgoing cable unit b3 and the 4th busbar unit c4, the 5th busbar unit c5 is electrically connected to the 5th outgoing cable unit b5 and the 4th busbar unit c4, the 2nd busbar unit c2 is electrically connected to the 4th outgoing cable unit b4, and the 4th busbar unit c4 is electrically connected to the 4th outgoing cable unit b4. This configuration reduces the number of transformers corresponding to two groups of incoming cable units a, saving space, weight and cost of the offshore platform. At the same time, the method of using three groups of incoming cable units a corresponding to five groups of outgoing cable units b eliminates two groups of transformers, reduces the problem of uneven distribution of electric energy and improves the utilization rate of submarine cable resources.

[0045] It can be understood that the number of return submarine cable resources can be selected according to demand in the high-voltage distribution system. When the number of return submarine cable resources is fixed, the number of corresponding outgoing cable units b and busbar units c can be determined and connected according to the return number. The technical solution of the embodiment of the present invention can ensure that all the electric energy of offshore wind power is evenly transmitted to the terminal through the outgoing cable unit b, and it simplifies the high-voltage distribution system to the greatest extent, reduces the occupied space and weight of the high-voltage distribution system, and promotes the lightweight of the offshore platform.

[0046] The technical solution of the embodiment of the present invention determines the number of incoming cable units and busbar units when the number of outgoing cable units is determined, connects the incoming cable units to the outgoing cable units through the busbar units, and one incoming cable unit corresponds to multiple outgoing cable units, and adjacent incoming cable units are connected to the same outgoing cable unit through the busbar unit. This arrangement can realize that a few incoming cable units can transmit electric energy to most outgoing cable units, realizes the average distribution of electric energy, reduces losses, and reduces the number of corresponding transformers required. At the same time, by optimizing the arrangement and combination of various components, the space, weight and cost of the offshore platform are saved to the greatest extent, and the lightweight of the offshore platform is promoted.

[0047] Optional, continue to refer to Figure 1 As shown, the high-voltage power distribution system includes a first incoming cable unit a1, a second incoming cable unit a2, a first outgoing cable unit b1, a second outgoing cable unit b2, a third outgoing cable unit b3, a first busbar unit c1, a second busbar unit c2 and a third busbar unit c3;

[0048] The first incoming cable unit a1 is electrically connected to the first bus unit c1; the first bus unit c1 is electrically connected to the first outgoing cable unit b1; and is electrically connected to the second outgoing cable unit b2 through the second bus unit c2; the second incoming cable unit a2 is electrically connected to the third bus unit c3; the third bus unit c3 is electrically connected to the third outgoing cable unit b3 and is electrically connected to the second outgoing cable unit b2 through the second bus unit c2.

[0049] Among them, the current offshore wind power transmission capacity mostly adopts a three-circuit transmission wiring scheme. In the prior art, when three main transformer groups are used, it will cause waste of offshore platform space and uneven distribution of electric energy; if two main transformer groups are used to correspond to three outgoing lines, in order to ensure the normal operation of the high-voltage distribution system, the prior art adopts a single busbar three-section or double busbar parallel operation wiring method. These two wiring methods are not highly reliable. If reliability is to be guaranteed, electrical components need to be added, which further increases the cost, space occupied and weight of the high-voltage distribution system.

[0050] For example, Figure 3is a wiring diagram of the prior art provided by an embodiment of the present invention, such as Figure 3 As shown, a single busbar wiring method is adopted, including two incoming cable units a, three outgoing cable units b and one busbar unit c. Each incoming cable unit a is electrically connected to a busbar unit c, and a busbar unit c is electrically connected to three outgoing cable units b. During the operation of this connection method, if the busbar unit c fails, it will cause a power outage in the entire station, and the corresponding three outgoing cable units b will not be able to transmit electrical energy, thereby affecting the normal operation of the high-voltage distribution system. This connection method reduces the reliability of the high-voltage distribution system.

[0051] In the embodiment of the present invention Figure 1 As shown, the first incoming cable unit a1 is electrically connected to the first bus unit c1; the first bus unit c1 is electrically connected to the first outgoing cable unit b1, and is electrically connected to the second outgoing cable unit b2 through the second bus unit c2; the second incoming cable unit a2 is electrically connected to the third bus unit c3; the third bus unit c3 is electrically connected to the third outgoing cable unit b3 and is electrically connected to the second outgoing cable unit b2 through the second bus unit c2. When one of the bus units c fails, the two outgoing cable units b can still transmit electric energy, thereby ensuring the normal operation of the high-voltage power distribution system.

[0052] It is understandable that cables with the same specifications have the same power transmission capacity, and each cable can only transmit a portion of the transformer's power.

[0053] The technical solution of the embodiment of the present invention is to arrange two main transformer incoming cable units to evenly distribute the electric energy provided by the units to three outgoing cable units and transmit the electric energy outwards, thereby reducing the occupied space and weight of the offshore platform and improving the utilization rate of submarine cable resources while ensuring that the reliability is not reduced.

[0054] Optional, continue to refer to Figure 1 As shown, the high voltage power distribution system also includes a circuit breaker e and a disconnector f;

[0055] A circuit breaker e and two disconnectors f are connected in series between the incoming cable unit a and the outgoing cable unit b, and the circuit breaker e is arranged in series between the two disconnectors f;

[0056] The circuit breaker e is used to cut off the circuit between the incoming cable unit a and the outgoing cable unit b when the circuit current between the incoming cable unit a and the outgoing cable unit b is abnormal; the isolating switch f is used to control the circuit between the incoming cable unit a and the circuit breaker e and / or the circuit between the outgoing cable unit b and the circuit breaker e to be disconnected after the circuit breaker e is started.

[0057] Among them, in order to ensure the reliability of the high-voltage power distribution system, a circuit breaker e and an isolating switch f are connected in series between the incoming cable unit a and the outgoing cable unit b, so that when the incoming cable unit a inputs electric energy to the bus unit c, the bus unit c transmits the electric energy to the outgoing cable unit b through the isolating switch f, the circuit breaker e and the isolating switch f.

[0058] For example, in the connection relationship between 2 incoming cable units a, 3 outgoing cable units b and 3 busbar units c, an isolating switch f, a circuit breaker e and an isolating switch f are sequentially arranged between the first busbar unit c1 and the first outgoing cable unit b1, an isolating switch f, a circuit breaker e and an isolating switch f are sequentially arranged between the first busbar unit c1 and the second busbar unit c2, an isolating switch f, a circuit breaker e and an isolating switch f are sequentially arranged between the second busbar unit c2 and the third busbar unit c3, and an isolating switch f, a circuit breaker e and an isolating switch f are sequentially arranged between the third busbar unit c3 and the third outgoing cable unit b3. With such arrangement, when a fault occurs in any circuit, disconnecting the corresponding circuit through the circuit breaker e isolating switches f will not affect the transmission of electric energy in other circuits, and will not cause multiple circuit breakers e to trip at the same time, thereby improving the reliability of the operation of the high-voltage power distribution system.

[0059] It can be understood that in the prior art, when a three-circuit outgoing line solution is adopted and two main transformers are used for corresponding wiring, in order to ensure that any component failure will not cause a power outage in the entire station, a wiring system with a single busbar three-way disconnection or a double busbar in parallel operation requires at least 6 or 7 groups of circuit breakers e, while in the embodiment of the present invention, only 4 groups of circuit breakers e are required, thereby further reducing the cost of the high-voltage distribution system and the occupied space and weight at sea, and ensuring the reliability of the operation of the high-voltage distribution system.

[0060] The technical solution of the embodiment of the present invention is to set a circuit breaker and an isolating switch between the outgoing cable unit and the incoming cable unit on the basis of the connection between the outgoing cable unit, the incoming cable unit and the busbar unit, so that when any component fails or is under maintenance, the corresponding circuit breaker and isolating switch can be started for convenient isolation, and the situation of multiple outgoing circuit breakers all tripping will not occur. With the least distribution equipment, the smallest space and weight occupied on the offshore platform, the electric energy input by offshore wind power is output in the most economical way, thereby ensuring the reliability of the operation of the high-voltage distribution system.

[0061] Optional, continue to refer to Figure 1 As shown, the high voltage power distribution system also includes a current transformer g;

[0062] The current transformer g is arranged in series between the circuit breaker e and the isolating switch f, and is used to detect the loop current between the circuit breaker e and the isolating switch f.

[0063] Among them, the current transformer g can be used to detect the loop current and determine the location of the fault. The current transformer g is set in series between the circuit breaker e and the disconnector f so that the current transformer g can detect the loop current between the circuit breaker e and the disconnector f in real time. When the system finds that the loop current of the corresponding current transformer g is abnormal, the corresponding circuit breaker e is immediately started, and then the disconnector f is disconnected for maintenance.

[0064] It can be understood that while ensuring that the number of circuit breakers e and disconnectors f is minimized, the corresponding number of current transformers g is also minimized. For example, if there are 4 circuit breakers e and 8 disconnectors f, then there are also 8 current transformers g, which reduces the occupied space and weight while ensuring the reliability of the high-voltage distribution system.

[0065] The technical solution of the embodiment of the present invention further ensures the reliability of the high-voltage power distribution system by setting a current transformer between the circuit breaker and the disconnector to perform real-time detection of the circuit condition, simplifies the cost, occupied space and weight of the high-voltage power distribution system, and effectively promotes the lightweighting of the offshore platform.

[0066] Optional, Figure 4 is a schematic diagram of a planar structure of a high-voltage power distribution system provided according to an embodiment of the present invention. Figure 5 is a schematic cross-sectional structural diagram of a first high-voltage power distribution system provided according to an embodiment of the present invention, Figure 6 is a schematic cross-sectional structural diagram of a second high-voltage power distribution system provided according to an embodiment of the present invention, Figure 7 is a schematic cross-sectional structure diagram of a third high-voltage power distribution system provided according to an embodiment of the present invention, wherein: Figure 5 for Figure 4 Cross-sectional view along A-A', Figure 6 for Figure 4 Cross-sectional view along B-B', Figure 7 for Figure 4 The cross-sectional view along C-C' is as follows: Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the circuit breaker e, the current transformer g and the disconnector f in the loop between the incoming cable unit a and the outgoing cable unit b are stacked along the first direction x.

[0067] Among them, on the basis of reducing the occupied area of ​​the high-voltage distribution system, the circuit breaker e, the current transformer g and the disconnector f are stacked along the first direction x. The first direction x can be the height direction of the high-voltage distribution system. Stacking the circuit breaker e, the current transformer g and the disconnector f along the first direction x can further reduce the occupied area of ​​the high-voltage distribution system.

[0068] For example, Figure 5 and Figure 6 As shown in the figure, it is a schematic diagram of the hardware structure of the high-voltage distribution system. The circuit transformer is arranged above the circuit breaker e, and the isolating switch f is arranged above each current transformer g, thereby realizing spatial stacking and further reducing the occupied area of ​​the high-voltage distribution system.

[0069] Optionally, the high-voltage power distribution system further includes a grounding switch; the grounding switch is connected in parallel with the isolating switch and one end of the grounding switch is grounded.

[0070] Among them, the grounding switch is connected in parallel with the isolating switch, one end of the grounding switch is grounded, and a grounding switch can be connected in parallel at each isolating switch. The grounding switch can carry the short-circuit current within a certain range to ensure the operation safety of the high-voltage distribution system.

[0071] Optionally, the high voltage power distribution system further comprises a voltage transformer;

[0072] One end of the voltage transformer is electrically connected to the incoming cable unit, and the other end is grounded; and the voltage transformer is connected in parallel with the outgoing cable unit to detect the loop voltage between the incoming cable unit and the outgoing cable unit.

[0073] Among them, the voltage transformer can detect the voltage of the corresponding circuit. The voltage transformer can be set to be electrically connected to the incoming cable unit, and the other end can be grounded, so that the outgoing cable unit is connected in parallel with the voltage transformer, and the voltage of the circuit corresponding to the cable unit can be measured. When the voltage is abnormal, the circuit breaker can also be used to protect the normal operation of the high-voltage distribution system.

[0074] Optionally, the high voltage power distribution system further includes a lightning arrester;

[0075] One end of the arrester is electrically connected to the incoming cable unit, and the other end is grounded; and it is connected in parallel with the outgoing cable unit to guide the overvoltage to discharge to the arrester and introduce the discharge current to the ground.

[0076] Among them, based on the fact that the high-voltage distribution system can be used at sea, taking into account the weather factors at sea, a lightning arrester is installed in the high-voltage distribution system. The lightning arrester is connected in parallel with the outgoing cable unit, so that the high-voltage distribution system can transmit power normally under lightning weather conditions, thereby improving the reliability of the operation of the high-voltage distribution system.

[0077] Based on the same inventive concept, an embodiment of the present invention further provides an offshore booster station, which includes a high-voltage power distribution system.

[0078] Among them, the high-voltage distribution system is set up in the offshore substation, which uses offshore wind power generation to transmit wind power to the high-voltage distribution system, and the high-voltage distribution system then transmits the electrical energy to the land power grid.

[0079] The technical solution of the embodiment of the present invention utilizes the flexible combination characteristics of components in the high-voltage distribution system in the offshore substation, and connects the number of incoming cable units, outgoing cable units and busbar units one by one, thereby meeting the requirement that cable resources are fully utilized, and can effectively reduce the precious space and weight occupied by the offshore platform. No matter which component fails or is under maintenance, it can be easily isolated, and the circuit breaker will not trip, that is, the entire station will not be shut down. While effectively improving the lightweight of the offshore platform, the operational reliability of the offshore substation is ensured.

[0080] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high voltage power distribution system for an offshore booster station, characterized in that: include: n incoming cable units, 2n-1 outgoing cable units and 2n-1 busbar units; the incoming cable units are used to transmit electrical energy to the outgoing cable units through the busbar units; The outgoing cable unit is used to transmit electric energy to the load end; wherein n≥2 and n is an integer; When i=1, the first incoming cable unit is electrically connected to the first bus unit; the first bus unit is electrically connected to the first outgoing cable unit; and is electrically connected to the second outgoing cable unit through the second bus unit; When 1<i<n, the i-th incoming cable unit is electrically connected to the 2i-1th busbar unit; the 2i-1th busbar unit is electrically connected to the 2i-1th outgoing cable unit; and is electrically connected to the 2i-th outgoing cable unit through the 2i-th busbar unit; and is electrically connected to the 2i-2th outgoing cable unit through the 2i-2th busbar unit; When i=n, ​​the nth incoming cable unit is electrically connected to the 2n-1th busbar unit; the 2n-1th busbar unit is electrically connected to the 2n-1th outgoing cable unit; and is electrically connected to the 2n-2th outgoing cable unit through the 2n-2 busbar unit; wherein, 1≤i≤n, and i is an integer.

2. The high voltage power distribution system according to claim 1, characterized in that: The high-voltage power distribution system comprises a first incoming cable unit, a second incoming cable unit, a first outgoing cable unit, a second outgoing cable unit, a third outgoing cable unit, a first busbar unit, a second busbar unit and a third busbar unit; The first incoming cable unit is electrically connected to the first busbar unit; the first busbar unit is electrically connected to the first outgoing cable unit; and is electrically connected to the second outgoing cable unit through the second busbar unit; the second incoming cable unit is electrically connected to the third busbar unit; the third busbar unit is electrically connected to the third outgoing cable unit and is electrically connected to the second outgoing cable unit through the second busbar unit.

3. The high voltage power distribution system according to claim 1, characterized in that: The high voltage power distribution system also includes a circuit breaker and an isolating switch; One circuit breaker and two disconnectors are connected in series between the incoming cable unit and the outgoing cable unit, and the circuit breaker is arranged in series between the two disconnectors; The circuit breaker is used to cut off the circuit between the incoming cable unit and the outgoing cable unit when the circuit current between the incoming cable unit and the outgoing cable unit is abnormal; the isolating switch is used to control the circuit between the incoming cable unit and the circuit breaker and / or the circuit between the outgoing cable unit and the circuit breaker to be disconnected after the circuit breaker is started.

4. The high voltage power distribution system according to claim 3, characterized in that: The high voltage power distribution system also includes a current transformer; The current transformer is arranged in series between the circuit breaker and the isolating switch, and is used to detect the loop current between the circuit breaker and the isolating switch.

5. The high voltage power distribution system according to claim 4, characterized in that: The circuit breaker, the current transformer and the isolating switch in the loop between the incoming cable unit and the outgoing cable unit are stacked along a first direction.

6. The high voltage power distribution system according to claim 3, characterized in that: The high voltage power distribution system further comprises a grounding switch; The grounding switch is connected in parallel with the isolating switch and one end of the grounding switch is grounded.

7. The high voltage power distribution system according to claim 1, characterized in that: The high voltage power distribution system also includes a voltage transformer; One end of the voltage transformer is electrically connected to the incoming cable unit, and the other end is grounded; and the voltage transformer is connected in parallel with the outgoing cable unit, and is used to detect the loop voltage between the incoming cable unit and the outgoing cable unit.

8. The high voltage power distribution system according to claim 1, characterized in that: The high voltage power distribution system also includes a lightning arrester; One end of the arrester is electrically connected to the incoming cable unit, and the other end is grounded; and the arrester is connected in parallel with the outgoing cable unit, so as to guide the overvoltage to discharge to the arrester and introduce the discharge current to the ground.

9. The high voltage power distribution system according to claim 1, characterized in that: The high-voltage power distribution system also includes a transformer; the transformer corresponds to the incoming cable unit one by one and is electrically connected.

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