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© P. Kundur

WTG -  19

Impact on System Dynamic Performance cont’d

Wind power plants could have a significant impact on “voltage stability” following a network fault

Induction generators absorb higher reactive power when voltage is low

Even DFIGs may “crow-bar” during a fault, and act as an induction generator

Increased reactive power consumption can lead to voltage instability if the transmission grid is weak

Voltage stability related to characteristics of WTGs, as opposed to load characteristics

A short-term phenomenon

Adequate and fast control of reactive power and voltage required

Overall solution requires coordinated control of wind farms, including use of external compensators such as SVCs and STATCOMS

cont’d

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