Offshore wind power-shore power combined power supply system for oil and gas platform

Abstract

The utility model provides an offshore wind power-shore power combined power supply system used for an oil gas platform, comprising an offshore wind power platform and a shore power platform, the offshore wind power platform is provided with a plurality of boost transformers, the boost transformers are connected with a current collection line of an offshore wind plant through a collection bus, and the collection bus is connected with the shore power platform. The boost transformer is connected to a second high-voltage bus on a shore power platform through a first high-voltage bus and a high-voltage submarine cable; the shore power platform is provided with a plurality of step-down transformers, the step-down transformers are connected with a land transformer substation through a high-voltage bus and a high-voltage submarine cable, and the step-down transformers are connected to an oil-gas platform through a medium-voltage bus and a medium-voltage submarine cable. According to the utility model, offshore wind power and shore power are combined, the output volatility of the offshore wind power is considered, and a shore power platform is added as a peak regulation means, so that the new energy consumption rate is improved, the project economy is improved, and the cost of independently constructing and sending out submarine cables for the offshore wind power is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of offshore wind power generation and offshore oil and gas fields, and in particular relates to an offshore wind power-shore power combined power supply system for an oil and gas platform. Background Art

[0002] For a long time, my country's offshore oil and gas platform self-generation mode has mainly used associated natural gas or crude oil as fuel for power generation. The capacity of a single generator is small, so a large number of generator sets are required. At the same time, the generator sets are inefficient and cause great environmental pollution. Imported generator sets are expensive to purchase and maintain, and are easily constrained by technology.

[0003] With the large-scale development of offshore wind power in my country, the installed capacity of offshore wind farms is increasing. At present, large-scale offshore wind farms are planned in Hebei, Shandong, Liaoning and other areas around the Bohai Bay oil and gas fields. Considering providing green electricity for oil and gas platforms through offshore wind power, replacing distributed gas or fuel generators, can respond to the national green energy policy, improve the level of new energy consumption, reduce carbon emissions and improve the economic efficiency of the project. Since the power load of oil and gas platforms is relatively stable, and the output of offshore wind power is volatile, it is necessary to connect to shore power and use the peak-shaving capacity of the power grid to gradually form a power supply mode for oil and gas platforms in which offshore wind power and shore power are combined. Utility Model Content

[0004] The purpose of the utility model is to provide an offshore wind power-shore power combined power supply system to supply power to the oil and gas platform in response to the problems existing in the existing oil and gas platform generator sets, hoping to make full use of the green electricity of offshore wind power, reduce carbon emissions, and improve the economic benefits of the project. At the same time, the shore power is connected as a peak-shaving means, so that the power supply system of the oil and gas platform can operate more safely, reliably and economically.

[0005] To this end, the above-mentioned purpose of the utility model is achieved through the following technical solutions:

[0006] An offshore wind power-shore power combined power supply system for an oil and gas platform, characterized in that: the power supply system comprises an offshore wind power platform and a shore power platform,

[0007] The offshore wind power platform is provided with a plurality of step-up transformers, the step-up transformers are connected to the collection line of the offshore wind farm via a collection bus, and the step-up transformers are connected to the second high-voltage bus on the shore power platform via a first high-voltage bus and a high-voltage submarine cable;

[0008] The shore power platform is provided with a plurality of step-down transformers, which are connected to the onshore substation via a high-voltage busbar and a high-voltage submarine cable, and are connected to the oil and gas platform via a medium-voltage busbar and a medium-voltage submarine cable.

[0009] While adopting the above technical solutions, the present invention can also adopt or combine the following technical solutions:

[0010] As a preferred technical solution of the utility model: the offshore wind power platform is stepped up to become a 120MW double-loop main transformer of 220kV level.

[0011] As a preferred technical solution of the present utility model: the busbar is a 35kV busbar.

[0012] As a preferred technical solution of the present utility model: the first high-voltage bus is a 220kV high-voltage bus.

[0013] As a preferred technical solution of the utility model: the voltage on the shore power platform is stepped down to a 220kV level double-loop main transformer.

[0014] As a preferred technical solution of the present utility model: the second high-voltage bus is a 220kV high-voltage bus.

[0015] As a preferred technical solution of the present utility model: the medium voltage bus is a 35kV medium voltage bus.

[0016] As a preferred technical solution of the utility model: the total capacity of the offshore wind farm is 200MW; the total capacity of the oil and gas platform is 100MW.

[0017] The utility model provides an offshore wind power-shore power combined power supply system for oil and gas platforms, improves the power supply mode of offshore oil and gas platforms, uses offshore wind power platforms to supply power to oil and gas platforms, increases the new energy consumption rate, reduces carbon emissions, and improves the economic efficiency of projects. Taking into account the volatility of offshore wind power output, shore power platforms are added as a peak-shaving means; when the offshore wind power platform is fully generated, the excess electricity can be sent to land via the shore power platform through a submarine cable, which improves the utilization rate of the submarine cable and saves the cost of separately building and sending submarine cables for offshore wind power. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a wiring diagram of the offshore wind power-shore power combined power supply system for oil and gas platforms provided by the utility model. DETAILED DESCRIPTION

[0019] An offshore wind power-shore power combined power supply system for an oil and gas platform comprises an offshore wind power platform and a shore power platform; wherein the offshore wind power platform comprises a collection bus, a step-up transformer and a high-voltage bus, and the shore power platform comprises a high-voltage bus, a step-down transformer and a medium-voltage bus.

[0020] The offshore wind farm collection line is connected to the offshore wind power platform, and after passing through the collection bus, it is stepped up by the step-up transformer, and after passing through the high-voltage bus, it is connected to the high-voltage bus of the shore power platform through the high-voltage submarine cable. The high-voltage bus of the shore power platform has two outgoing lines, one high-voltage submarine cable is connected to the high-voltage bus of the offshore wind power platform, and the other is connected to the onshore substation. After the high-voltage electricity of the shore power platform is stepped down by the step-down transformer, it is led out through the medium-voltage bus to each medium-voltage submarine cable to each offshore oil and gas platform for power supply to each oil and gas platform.

[0021] The above offshore wind power-shore power combined power supply system is coordinated as follows:

[0022] (1) The installed capacity of an offshore wind farm shall not be greater than twice the electricity load of an oil and gas platform;

[0023] (2) When the output of offshore wind power is lower than the power load of the oil and gas platform, all the electricity generated by offshore wind power is used to power the oil and gas platform, and the shortfall is fed back from the onshore substation to the shore power platform to power the oil and gas platform;

[0024] (3) When the output of offshore wind power is higher than the power load of the oil and gas platform, the electricity generated by the offshore wind power is used to supply power to the oil and gas platform, and the excess electricity is sent to the onshore substation to sell to the power grid.

[0025] The present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1 As shown, this embodiment provides an example of an offshore wind power-shore power combined power supply system for an oil and gas platform, wherein the offshore wind power platform 1 is provided with a 220kV high-voltage bus 2, a 35kV collecting bus 3, and two 220kV offshore wind power platform 120MW double-loop main transformers 4; the shore power platform 5 is provided with a 220kV high-voltage bus 6, a 35kV medium-voltage bus 7, and two 220kV double-loop main transformers 8; the total capacity of the offshore wind farm 10 is 200MW; and the total capacity of the oil and gas platform 11 is 100MW.

[0027] The offshore wind farm 10 is connected to the collection bus 3 of the offshore wind power platform 1 through the collecting submarine cable 12, and then the voltage is increased by the step-up transformer 4, and then connected to the high-voltage bus 6 of the shore power platform 5 through the high-voltage submarine cable 13 after passing through the high-voltage bus 2, so as to supply power to the shore power platform. The high-voltage bus 6 of the shore power platform 5 is connected to the onshore substation 9 through the high-voltage submarine cable 14. At the same time, after the high-voltage electricity is reduced in voltage by the step-down transformer 8, it is led out through the medium-voltage bus 7 to various medium-voltage submarine cables 15 to each offshore oil and gas platform 11, and is used to supply power to each oil and gas platform.

[0028] The high-voltage submarine cable 14 between the onshore substation 9 and the shore power platform 5 acts as a two-way bridge. When the output of the offshore wind farm 10 is lower than the power load of the oil and gas platform 11, all the electricity generated by the offshore wind farm 10 is used to power the oil and gas platform 11, and the shortfall is sent back from the onshore substation 9 to the shore power platform 5 via the high-voltage submarine cable 14 to power the oil and gas platform 11; and when the output of the offshore wind farm 10 is higher than the power load of the oil and gas platform 11, in addition to being used to power the oil and gas platform 11, the surplus electricity will be sent to the onshore substation 9 via the high-voltage submarine cable 14 to sell electricity to the power grid.

[0029] In this embodiment, the total capacity of the offshore wind farm 10 is 200MW, and the total capacity of the oil and gas platform 11 is 100MW, so the high-voltage submarine cable 14 only needs to meet the transmission capacity of 100MW.

[0030] Such dynamic adjustment and the addition of shore power platforms as a means of peak load regulation not only increase the new energy consumption rate, but also improve the economic efficiency of the project and save the cost of building a separate submarine cable for offshore wind power.

[0031] The above-mentioned specific implementation methods are used to explain the present invention and are only preferred embodiments of the present invention, rather than limiting the present invention. Any modifications, equivalent substitutions, improvements, etc. made to the present invention within the spirit of the present invention and the protection scope of the claims shall fall within the protection scope of the present invention.

Claims

1. An offshore wind power-shore power combined power supply system for oil and gas platforms, characterized by: The power supply system includes an offshore wind power platform and a shore power platform. The offshore wind power platform is provided with a plurality of step-up transformers, the step-up transformers are connected to the collection line of the offshore wind farm via a collection bus, and the step-up transformers are connected to the second high-voltage bus on the shore power platform via a first high-voltage bus and a high-voltage submarine cable; The shore power platform is provided with a plurality of step-down transformers, which are connected to the onshore substation via a high-voltage busbar and a high-voltage submarine cable, and are connected to the oil and gas platform via a medium-voltage busbar and a medium-voltage submarine cable.

2. The offshore wind power-shore power combined power supply system for oil and gas platforms according to claim 1 is characterized in that: The offshore wind power platform is stepped up to become a 120MW double-loop main transformer of 220kV level.

3. The offshore wind power-shore power combined power supply system for oil and gas platforms according to claim 1 is characterized in that: The busbar is a 35kV busbar.

4. The offshore wind power-shore power combined power supply system for oil and gas platforms according to claim 1 is characterized in that: The first high-voltage bus is a 220kV high-voltage bus.

5. The offshore wind power-shore power combined power supply system for oil and gas platforms according to claim 1 is characterized in that: The voltage on the shore power platform is stepped down to a 220kV level double-loop main transformer.

6. The offshore wind power-shore power combined power supply system for oil and gas platforms according to claim 1 is characterized in that: The second high-voltage bus is a 220kV high-voltage bus.

7. The offshore wind power-shore power combined power supply system for oil and gas platforms according to claim 1 is characterized in that: The medium voltage bus is a 35kV medium voltage bus.

8. The offshore wind power-shore power combined power supply system for oil and gas platforms according to claim 1 is characterized in that: The total capacity of the offshore wind farm is 200MW; the total capacity of the oil and gas platform is 100MW.

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