کاهش تشدید زیرسنکرون (SSR) در مزرعه بادی جبران شده سری با استفاده از کنترل کننده های FACTS

Mitigation of Subsynchronous Resonance in a Series-Compensated Wind Farm Using FACTS Controllers

سال انتشار : 2008

نوع مقاله : IEEE JOURNALS & MAGAZINES

تعداد صفحات : 9

Abstract—The rapid growth of wind power systems worldwide

will likely see the integration of large wind farms with

electrical networks that are series compensated for ensuring

stable transmission of bulk power. This may potentially lead

to subsynchronous-resonance (SSR) issues. Although SSR is a

well-understood phenomenon that can be mitigated with flexible

ac transmission system (FACTS) devices, scant information is

available on the SSR problem in a series-compensated wind farm.

This paper reports the potential occurrence and mitigation of SSR

caused by an induction-generator (IG) effect as well as torsional

interactions, in a series-compensated wind farm. SSR suppression

is achieved as an additional advantage of FACTS controllers which

may already be installed in the power system for achieving other

objectives. In this study, a wind farm employing a self-excited

induction generator is connected to the grid through a series-compensated

line. A static var compensator (SVC) with a simple

voltage regulator is first employed at the IG terminal in addition

to the fixed shunt capacitor for dynamic reactive power support.

The same SVC is shown to effectively damp SSR when equipped

with an SSR damping controller. Also, a thyristor-controlled

series capacitor (TCSC) that is actually installed to increase the

power transfer capability of the transmission line is also shown to

damp subsynchronous oscillations when provided with closed-loop

current control. While both FACTS controllers—the SVC and

TCSC—can effectively mitigate SSR, the performance of TCSC is

shown to be superior. Extensive simulations have been carried out

using EMTDC/PSCAD to validate the performance of SVC and

TCSC in damping SSR.