Implication of Grid Code Requirements on Reactive Power Contribution and Voltage Control Strategies for Wind Power Integration

The exploitation of wind power is often limited due to the weak interconnection to the main grid. Little consideration given to the different boundary conditions, can either limit the exploitation of potential sites, or increase considerably the costs of integration. This paper explains the relations between grid strength and requirements for wind power generators on reactive power contribution and voltage control. The reactive power needed to support the voltage is mapped, in a generic grid equivalent, by varying the short circuit power and the RX ratio at the point of common coupling (PCC) of the wind-farm. The methods presented are relevant for any project involving the exploitation of wind energy in proximity to weak electric grids.