Patent ID: 8041465

Claim:
A system for controlling voltage at a voltage regulation point on a system of windfarms comprising: a plurality of local windfarms; a collector bus for each local windfarm; at least one transmission line connecting a point of common coupling for the collector buses to a point of interconnection with a grid; a local windfarm controller for each local windfarm, adapted for control of a generation of real power and reactive power for each individual generator of a local windfarm; a control system configured to generate reactive power commands for each local windfarm controller for controlling voltage at the voltage regulation point subject to at least one additional constraint on an operating parameter of at least one of the collector bus for each local windfarm and the at least one transmission line, wherein the control system is further configured to implement a constraint algorithm to determine when the operating parameter has exceeded a predesignated limit and to control the reactive power commands generated for each local wind farm controller so that the at least one additional constraint is not violated.