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Offshore Wind Park Connection

This thesis investigates the comparison between two different alternating current topologies of an offshore wind farms connection to an offshore high voltage direct current (HVDC) converter platform.

Offshore Wind Park Connection To an HVDC Platform, Without Using an AC Collector Platform
Offshore Wind Park Connection To an HVDC Platform, Without Using an AC Collector Platform (on photo: The 800 MW High Voltage Direct Current (HVDC) link connects offshore wind farms around 75 km off the German coast in the DolWin cluster, with the country’s transmission grid.)

The offshore high voltage direct current converter platform converts alternating current into direct current. Two different topologies will be investigated.

In the first topology, the offshore wind farms are connected to an HVDC converter platform through offshore AC collector platform.

An offshore AC collector platform is used to collect energy from the wind farm and step up the voltages for transmission to HVDC convertor platform. The offshore AC collector platforms contribute significantly in the total cost and technical complexity of the HVDC connection.

In the second topology, the offshore AC collector platform is removed from the circuit and the offshore wind farms are connected directly to offshore HVDC converter platform.

Schematic circuit diagram for offshore wind farm cluster link 33kV internal grid with AC collector platform
Figure 1 – Schematic circuit diagram for offshore wind farm cluster link 33kV internal grid with AC collector platform

In this thesis, short circuit analysis and loss analysis of an offshore wind farm cluster connected to an offshore HVDC converter platform is conducted for the two topologies described above.

Two wind turbine generator types i.e. doubly fed induction generator and full conversion generator is compared for two different topologies. The effect of changing the distance between wind farms and offshore HVDC converter platform on short circuit currents in the absence of AC collector platform is presented for the second configuration.

Two internal voltage levels i.e. 33 kV and 66kV of wind farms are compared for short circuit currents in the absence of AC collector platform.

DIgSILENT software is used to perform short circuit calculations.

The thesis is done in collaboration with “Offshore Wind Connections” department ABB, Sweden. The idea is still under development however this study will serve as good starting point to figure out the cost efficient AC topology of an offshore wind park HVDC connection.


Thesis Structure

Following is the structure of the thesis:

Chapter 1 – Introduction (this section) describes the methodology and scope of this thesis and gives an overview of the structure

Chapter 2Internal Electrical Layout Comparison of an Offshore Wind Farm discusses the two options for internal wind farm connections and gives cost and loss analysis.

Chapter 3 – Components of an Offshore HVDC Link discusses the importance of the components present in an offshore HVDC link and their cost trends.

Chapter 4 – Cost Estimation discusses the costs of different components in the AC collector platform and HVDC converter platform.

Chapter 5 – Short Circuit Analysis of an Offshore Wind Farm discusses types of wind turbine generators currently used in the industry and their short circuit contributions.

Chapter 6 – Offshore Wind Farms Connection Using DIgSILENT analyses two different cases of wind farm cluster connection to an offshore HVDC converter platform for short circuit current calculation.

Chapter 7 – Loss Analysis discusses the loss analysis of two cases of wind farm cluster connection to an offshore HVDC converter platform.

Chapter 8 – Conclusion presents the overall conclusion obtained from this study and future work that can be done in this field.

The span of this thesis is twelve weeks (26th March, 2012 to 17th June, 2012) which is scheduled in such a way that half of the time is dedicated for the literature review and half for the execution of calculation and analysis.

Title:Offshore Wind Park Connection to an HVDC Platform, Without Using an AC Collector Platform – Haseeb Ahmad at Department of Wind Energy, Gotland University. Sweden
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Size:3.70 MB
Pages:120
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Offshore Wind Park Connection To an HVDC Platform, Without Using an AC Collector Platform
Offshore Wind Park Connection To an HVDC Platform, Without Using an AC Collector Platform

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