Dynamic Control of PowerElectronic Interfaced WTGs
The emerging trend for electric utilities to install wind based generation on a large scale into distribution networks, employing DFIG or full converter turbine technologies is raising issues for distribution planning engineers with regard to flicker amongst other power quality issues. This paper investigates dynamic Volt/VAR control, a viable flicker mitigation technique which exploits the reactive power capabilities of modern power electronic interfaced wind turbine generators (WTGs). Dynamic Volt/VAR control essentially mitigates flicker by solely dispatching reactive power based on voltage fluctuations within the flicker frequency band.
This technique can be incorporated as part of a wind farm multi-objective reactive power control scheme, which facilitates regulating both 1) the voltage level at the point of common coupling (PCC) employing slow acting voltage control or power factor control and 2) the flicker level at the PCC with fast acting dynamic Volt/VAR control. This two-level approach can reduce the wind farm flicker level up to 80 % and maintains the voltage level at the PCC well within acceptable bands. The results presented in this paper focus on a typical 25 kV medium voltage distribution feeder integrating wind based generation on a large scale. The performance of the two-level controller was tested for varying levels of penetration and wind speed conditions. The applicable standards and utility grid code requirements are considered throughout.
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