Comparative study on fault responses of synchronous generators and wind turbine generators using transient stability index based on transient energy function

• Impact analysis is done by evaluating TSI through the assessment of TEF.
• Machine used: SG, SCIG and DFIG.
• Impact factors: fault clearing time, grid coupling, inertia constant, voltage sag.
• Results on SG justifies the importance of quantitative analysis.
• DFIG shows better transient performance than SCIG.

Increasing wind power penetration into the grid justifies the requirement of the analysis of wind power dynamics, especially during transient faults. Quantitative transient stability (TS) assessment is required to provide deeper insight into the TS problems for speeding up the operational decision making process. This can be achieved by evaluating transient stability index (TSI) through the assessment of transient energy function. This paper carries out the quantitative insight of the impact of different generator technologies on the grid by comparatively studying the impacts of the fault clearing time, the grid coupling, the inertia constant, the generator terminal voltage sag and the slip on fault responses with the TSI between synchronous generators and wind turbine generators, such as squirrel cage induction generators and doubly fed induction generators.