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Evaluation of voltage control methods for maximising end-of-grid wind farm capacity: Using the Kalbarri Wind Farm as a Study Case

Xie, Fang (2014) Evaluation of voltage control methods for maximising end-of-grid wind farm capacity: Using the Kalbarri Wind Farm as a Study Case. Other thesis, Murdoch University.

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Abstract

Evaluation of voltage control methods for maximizing end-of-grid wind farm capacity uses the Kalbarri Wind Farm as a base study case. The weakness of end-of-grid feeders is that they have relatively high resistance and reactance, which lead to high real and reactive power losses and low power transfer capability.

This thesis report provides summaries of the voltage control algorithms from the simplest to the most complex algorithm. The parameters of the Kalbarri Wind Farm elements are based on the documents provided by Verve Energy. This thesis investigates the voltage control algorithm including the use of a Static Synchronous Compensator (STATCOM) with the wind farm in order to stabilise the grid voltage.

The voltage control algorithm study cases are based on the Kalbarri Network Model, and its system simulations are carried out by using DIgSILENT PowerFactory software.

The first voltage control algorithm is a wind turbine with fixed power factor which is the simplest voltage control algorithm. The second voltage control algorithm is the wind turbine with fixed power factor combined with a STATCOM, with the STATCOM using the isochronous voltage control method. The STATCOM size required for this voltage control algorithm is so large that it makes the system uneconomic. In order to improve it, the third voltage control algorithm uses a ±1MVAr STATCOM. At the same time, an upstream voltage regulator controls the STATCOM within a ±0.8MVAr range. The upstream voltage regulator does the remote control, since there is communications between the upstream regulator and the STATCOM. The fourth voltage control algorithm is built on the third algorithm with the STATCOM using the droop voltage control method. The upstream regulator indirectly controls the Point of Connection (PoC) voltage by using the Line Drop Compensation (LDC) to keep STATCOM within a ±0.8MVAr Range. In the fourth voltage control algorithm, the LDC is used to take the place of the communications in the third algorithm.

The ‘WindFREE’ wind turbine option is also considered in this thesis report, which means the wind turbine is equipped with the feature of providing reactive power under the ‘no wind’ conditions. The dynamic voltage control algorithm with the STATCOM using a variable voltage setpoint, as used in Kalbarri is evaluated.

Future works that could be a continuation of this topic are proposed and the thesis report includes a summary of case studies.

Publication Type: Thesis (Other)
Murdoch Affiliation: School of Engineering and Information Technology
Supervisor: Carter, Craig and Lee, Gareth
URI: http://researchrepository.murdoch.edu.au/id/eprint/25668
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