Electrical wiring structure of offshore diode converter station

Abstract

The utility model discloses an electrical wiring structure of an offshore diode converter station. The electrical wiring structure comprises an offshore wind turbine generator, an AC filter, a converter transformer and a double twelve-pulse diode rectifier. The offshore wind turbine generator and the alternating current filter are respectively connected with one end of the converter transformer, the other end of the converter transformer is connected with the alternating current side of the double twelve-pulse diode rectifier, and the direct current side of the double twelve-pulse diode rectifier is connected with a load; and the double twelve-pulse diode rectifiers comprise two twelve-pulse diode rectifiers which are connected in parallel. Due to the adoption of the technical scheme, compared with the prior art, the double twelve-pulse diode rectifier adopted by the utility model can effectively reduce voltage harmonic waves so as to reduce the filtering level of a system, save the volume and the weight of a filter and reduce the cost of the system to a certain extent. And secondly, the midpoint of the double twelve-pulse diode rectifier is grounded to form positive and negative pole voltage, so that the insulation level of the system is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of offshore wind power direct current transmission engineering, in particular to an electrical wiring structure of an offshore diode converter station. Background Art

[0002] Driven by energy transition and the maturing of offshore wind power technology, wind farm sites are gradually being developed in the deep sea, with wider sea areas and richer wind energy resources. As the installed capacity and offshore distance of deep sea wind farms continue to increase, economical and reliable offshore wind power transmission methods are becoming increasingly important. Because the capacitive charging current of AC submarine cables limits the transmission capacity and distance of AC transmission, large-scale offshore wind power is mostly transmitted using DC transmission. Currently, offshore wind power transmission in engineering projects mainly uses flexible DC transmission technology based on modular multilevel converters. However, the large size and heavy weight of offshore flexible DC converter stations make offshore platform construction difficult and the maintenance and investment costs high.

[0003] Therefore, it is urgent to develop an electrical wiring structure for an offshore diode converter station to solve the shortcomings of the offshore flexible direct current converter station, such as its large size and heavy weight, which make the construction of offshore platforms difficult and the maintenance and investment costs high. Summary of the Invention

[0004] The utility model provides an electrical wiring structure for an offshore diode converter station to solve the technical problems of existing offshore flexible direct current converter stations being large in size and heavy in weight, making offshore platform construction difficult and the maintenance and investment costs high.

[0005] In order to achieve the above-mentioned purpose, the present utility model adopts the following technical solutions.

[0006] An electrical wiring structure for an offshore diode converter station includes an offshore wind turbine, an AC filter, a converter transformer, and a dual twelve-pulsating diode rectifier. The offshore wind turbine and the AC filter are respectively connected to one end of the converter transformer, the other end of the converter transformer is connected to the AC side of the dual twelve-pulsating diode rectifier, and the DC side of the dual twelve-pulsating diode rectifier is connected to a load. The dual twelve-pulsating diode rectifier includes two twelve-pulsating diode rectifiers connected in parallel.

[0007] In some embodiments, an electrical connection point between the two dual twelve-pulsating diode rectifiers is grounded.

[0008] In some embodiments, the offshore wind turbine is a grid-type wind turbine.

[0009] In some embodiments, the twelve-pulse diode rectifier includes two upper and lower six-pulse units, and the AC sides of the upper and lower six-pulse units are respectively connected to one of the converter transformers, and the connection groups of the two converter transformers are divided into YNy0 and YNd11 connections.

[0010] In some embodiments, a smoothing reactor is further provided between the DC side of the double twelve pulsating diode rectifier and the load.

[0011] The utility model has at least the following technical effects or advantages:

[0012] 1. The double twelve pulsating diode rectifier can effectively reduce voltage harmonics, thereby lowering the filtering level of the system, saving the volume and weight of the filter, and reducing the cost of the system to a certain extent;

[0013] 2. The midpoint grounding of the double twelve pulsating diode rectifier can form positive and negative voltages, thereby reducing the insulation level of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a circuit diagram of the electrical wiring structure of an offshore diode converter station in one embodiment of the present utility model;

[0015] Figure 2 It is a schematic diagram of the filtering effect of the existing twelve-pulse diode rectifier;

[0016] Figure 3 This is a schematic diagram of the filtering effect of a double twelve pulsating diode rectifier in one embodiment of the present utility model. DETAILED DESCRIPTION

[0017] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0018] See also Figure 1 An electrical wiring structure for an offshore diode converter station includes an offshore wind turbine 1, an AC filter 2, a converter transformer 3, a dual 12-pulsating diode rectifier 4, and a smoothing reactor 5. The offshore wind turbine 1 and the AC filter 2 are each connected to one end of the converter transformer 3. The other end of the converter transformer 3 is connected to the AC side of the dual 12-pulsating diode rectifier 4. The DC side of the dual 12-pulsating diode rectifier 4 is connected to a load. The smoothing reactor 5 is disposed between the DC side of the dual 12-pulsating diode rectifier and the load. The offshore wind turbine can be a grid-type wind turbine.

[0019] Specifically, the dual 12-pulsating diode rectifier 4 comprises two parallel 12-pulsating diode rectifiers, each comprising an upper and lower 6-pulsating unit. The AC sides of the upper and lower 6-pulsating units are each connected to one of the converter transformers. The connection groups of the two converter transformers are divided into YNy0 and YNd11 connections. Preferably, the electrical connection point between the two dual 12-pulsating diode rectifiers is grounded.

[0020] like Figure 2 and Figure 3 As shown, compared with the existing twelve-pulsating diode rectifier, the dual twelve-pulsating diode rectifier of the present application can effectively reduce voltage harmonics to reduce the filtering level of the system, save the volume and weight of the filter, and reduce the cost of the system to a certain extent.

[0021] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An electrical wiring structure for an offshore diode converter station, characterized in that: It includes an offshore wind turbine, an AC filter, a converter transformer and a dual twelve-pulsating diode rectifier; the offshore wind turbine and the AC filter are respectively connected to one end of the converter transformer, the other end of the converter transformer is connected to the AC side of the dual twelve-pulsating diode rectifier, and the DC side of the dual twelve-pulsating diode rectifier is connected to the load; the dual twelve-pulsating diode rectifier includes two twelve-pulsating diode rectifiers connected in parallel.

2. The electrical connection structure of the offshore diode converter station according to claim 1, characterized in that: An electrical connection point between the two double twelve pulsating diode rectifiers is grounded.

3. The electrical connection structure of the offshore diode converter station according to claim 1 or 2, characterized in that: The offshore wind turbine generator set is a grid-type wind turbine generator set.

4. The electrical connection structure of the offshore diode converter station according to claim 1 or 2, characterized in that: The twelve-pulse diode rectifier includes two upper and lower six-pulse units. The AC sides of the upper and lower six-pulse units are respectively connected to one of the converter transformers. The connection groups of the two converter transformers are divided into YNy0 and YNd11 connections.

5. The electrical connection structure of the offshore diode converter station according to claim 1 or 2, characterized in that: A smoothing reactor is further provided between the DC side of the double twelve pulsating diode rectifier and the load.

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