Coordinated utilisation of wind farm reactive power capability for system loss optimisation

摘要

Most wind farms currently being installed are based upon doubly fed induction generator (DFIG) or direct-drivensynchronous generator (DDSG) technology. Given that one of the impacts of introducing distributed generation is annalteration of steady-state power flows and voltages, both technologies are capable of providing local voltage support.Windnfarms may, therefore, be included in optimal power flow (OPF) calculations to minimise fuel cost and/or network losses.nThe IEEE 30-bus system is considered as a case study, comparing fixed-speed induction generator (FSIG) requirementsnwith DFIG capability. Results are presented for a range of DFIG capability modes, at varying system load and wind farmnpenetration levels. A significant reduction in losses can be achieved by suitable co-ordination of DFIG reactive powernimport/export, operating within typical grid code specifications. It is shown that the dynamic variability of reactive powernrequirements is readily accommodated by the power system. Finally, implementation options for the scheme andnincentivising strategies are considered. Copyright # 2010 John Wiley & Sons, Ltd.