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This paper proposes a flexible compensation strategy for parallel-connected doubly fed induction generators (DFIGs) when connected to an unbalanced weak grid. The proposed strategy has two main advantages: 1) the voltage unbalance factor (VUF) at the point of common coupling (PCC) can be continuously controlled, thus the flexible trade-off between the balanced DFIG output current and the balanced...
This paper proposes a method to consider the impact of the wind farms maximum current limits on real-time voltage stability assessment. The approach is based in a multi-port equivalent of the system which makes possible to assess the effect of each wind farm limit on the stability boundary, the approach indicates the distance to the limit activation and the effect of each load in such a limit. The...
In order to analyze the impacts on the grid fault identification criteria in stability control systems (SCSs), an electromagnetic transient model is set up for a three-machine nine-bus test system containing wind power generators. Then, an analysis of impacts on adjacent AC grid fault characteristics of wind power integration and its power electronics based control systems and a discussion of problems...
Wind farms are becoming important distributed renewable energy resources. However, voltage stability issues with wind farms employing fixed-speed induction generators may require such systems to be augmented with dynamic compensation devices, such as STATCOM units. In preparation for deployment of a 10 MVA STATCOM at an existing wind farm in the Bonneville Power Administration (BPA) system, the STATCOM...
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