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This paper investigates how different approaches to grid synchronization and reference frame orientation can improve the control performance of a voltage source inverter operating in a weak grid. It is first shown how voltage-sensor-less operation based on Virtual Flux allows for flexibility in how to choose the reference frame orientation of the control system. The different possible orientations...
This paper analyzes the extent to which the transient stability margin of wind farms using squirrel cage generators can be increased by the use of a STATCOM. A simplified analytical approach is used first to quantify the effect of the STATCOM on the transient stability margin. An experimental validation of the calculated transient margin is then presented by measurements done in a laboratory prototype...
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