Power-Flow Analysis of Large Wind Power Plant Collector Systems With Remote Voltage Control Capability

This paper presents and develops a new power flow analysis approach of large wind farm collector systems. The wind turbine units, within the wind power plant, are controlled to remotely regulate the collector bus (or the point of interconnection (POI)) voltage. The developed power-flow algorithm determines the reactive power set points of the individual wind turbines to control the voltage at a remote bus. To incorporate the wind farm collector system in the bulk transmission power-flow analysis, an equivalent model of large wind power plants is developed. New bus types are defined and the necessary modifications to the conventional Newton-Raphson (N-R) power-flow formulation is presented. The proposed power-flow algorithm is implemented and tested on an existing wind farm.