Effect of operational modes of a wind farm on the transient stability of nearby generators and on power oscillations: a Nordic grid study

Abstract

AbstractIn this work, an operational mode of variable speed wind turbines to enhance the transient stability of nearby conventional generators is presented and investigated. This mode is then tested on the CIGRÉ Nordic32 test grid which is taken as a representation of the Swedish transmission network. It is found that by incorporating the suggested mode into the control of several planned wind farms in the southern part of the Swedish grid, the transient stability of nearby conventional generators can be increased compared to the base case where no wind farms were connected. It is also concluded that care has to be taken when selecting the control mode of a wind farm (constant power factor operation or voltage control operation) in a particular situation when it is connected together with a nearby conventional synchronous generator. The interaction between the operational mode of a wind farm and the overall synchronous generator control may interact with each other and could lead to a reduction of damping of power oscillations in nearby transmission lines instead of increasing the damping. Copyright © 2007 John Wiley & Sons, Ltd.