Impact of Wind Generators and Synchronous Generator Controllers on a Power System Transient Stability

M. Khomari and K.A. Folly (South Africa)

Keywords

Squirrel cage induction generators (SCIG), doublyfed induction generators (DFIG),direct drive synchronous generators (DDSG), Wind generator (WG)

Abstract

This paper presents an investigation of the impact of wind generators on the transient stability of a power system network. The effects of different types of wind generator technologies (Squirrel Cage Induction Generator-SCIG, Doubly fed Induction Generator-DFIG and Direct Drive Synchronous Generator-DDSG) are investigated. The dynamics of the power system following a three phase fault were investigated by analyzing the rotor angle and terminal voltage of the conventional synchronous generator without an AVR. The results showed that the squirrel cage induction generator has a negative impact on the power system’s transient stability as compared to the doubly-fed induction generator and the direct drive synchronous generator. The effect of the conventional generator’s Automatic Voltage Regulator (AVR) and Speed Governor, on the transient stability of the system was also investigated with only SCIG being connected to the network. The results show that an AVR has a better effect on a power system’s transient stability in comparison to a speed governor when SCIG were connected to the network.

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