Mechanism of Small Signal Stability of Asynchronous Wind Turbines

doi:10.3969/j.issn.1000－7229.2013.08.003

Abstract

Abstract:

The definition and classification of stability analysis on conventional power system is mainly aimed at the dynamics of synchronous generator system. Based on the method combining physical process analysis and characteristics modal analysis， as well as the rule “from simple to complex，” the small signal stabilities of squirrel-cage induction generator， squirrel-cage induction wind turbine and doubly-fed induction wind turbine are discussed. The results show that: the small signal stability of squirrel-cage induction wind turbine is determined by the non-oscillation mode correlated with rotor speed， whereas the small signal stability of doubly-fed induction wind turbine is determined by the oscillation mode correlated with rotor transient voltage and rotor-side converter controller. Although the dominate mode differs with each other， it is the low voltage that causes the eigenvalues to cross the imaginary axis. Therefore， from the point of the physical process， the small signal stability of induction wind turbines is suggested to be one type of voltage stability of power system.

Key words:

induction generator, induction wind turbine, small signal stability, small disturbance voltage stability, doubly-fed induction wind turbine

MA Yanhong， DING Nan， QIAO Ying. Mechanism of Small Signal Stability of Asynchronous Wind Turbines[J]. ELECTRIC POWER CONSTRUCTION, 2013, 34(8): 11-16.

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