الفهرس 
Wind Turbine Technology.
Low Voltage Ride Through.Only 14 pages are availabe for public view
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Abstract
Low voltage ride through (LVRT) of fixed speed wind turbines (FSWT) is
performed by means of either blade pitch angle control or using external
flexible alternating current transmission system FACTS devices.
Deployed FACTS solution can be either series or shunt connected. Reactive
power injection from shunt FACTS such as the SVC and the static
synchronous compensator (STATCOM) are dependent on the connection
point voltage. These shunt FACTS have limited reactive power contribution
during fault and consequently a limited impact on the WTG terminal
voltage. Additionally they have limited ability to help the WTG evacuating
its active power in order to limit the rotor acceleration.
As LVRT solutions series FACTS are able to boost the WTG voltage
and thus advantageous over the shunt FACTS. Among the series FACTS
proposed to allow the LVRT of FSWT are the static series synchronous
compensator (SSSC) and the series dynamic braking resistor (SDBR).
The aim of this thesis is to propose, develop and analyze a low voltage
ride through (LVRT) solution for fixed speed wind turbines (FSWT). A
continuously variable series braking resistor (CVSBR) is proposed in this
work as a successful means for LVRT of FSWTs.
The proposed CVSBR is compared to other potential series FACTS. The
CVSBR shows a good performance as a solution to enhance the LVRT
capability of the FSWT. The solution of CVSBR is implemented in a large
scale wind power plant (WPP), the WPP is aggregated and the performance of the CVSBR is assessed on the level of the WPP as being as successful as
the on the level of single WTG.