access icon free Damping torque analysis of power systems with DFIGs for wind power generation

© The Institution of Engineering and Technology
Received 02/03/2016, Accepted 13/07/2016, Revised 20/06/2016, Published 18/07/2016

A grid-connected double fed induction generator(DFIG) for wind power generation can affect power system small-signal angular stability in two ways: by changing the system load flow condition and dynamically interacting with synchronous generators (SGs). This study presents the application of conventional method of damping torque analysis (DTA) to examine the effect of DFIG's dynamic interactions with SGs on the small-signal angular stability. It shows that the effect is due to the dynamic variation of power exchange between the DFIG and power system and can be estimated approximately by the DTA. Consequently, if the DFIG is modelled as a constant power source when the effect of zero dynamic interactions is assumed, the impact of change of load flow brought about by the DFIG can be determined. Thus the total effect of DFIG can be estimated from the result of DTA added on that of constant power source model. Applications of the DTA method proposed in this study are discussed. An example of multi-machine power systems with grid-connected DFIGs is presented to demonstrate and validate the DTA method proposed and conclusions obtained in this study.

Inspec keywords: asynchronous generators; power generation control; wind power plants; load flow control; torque control; power grids; power system stability; synchronous generators

Other keywords: SG; constant power source model; power exchange dynamic variation; multimachine power system small-signal angular stability; wind power generation; DTA method; damping torque analysis; zero dynamic interactions; grid-connected DFIG; synchronous generators; system load flow condition

Subjects: Asynchronous machines; Mechanical variables control; Wind power plants; Control of electric power systems; Stability in control theory; Synchronous machines; Power system control

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