Abstract
To guarantee the reliable and efficient development of wind power generation, oscillation problems in large-scale wind power bases with Type-IV generators are investigated from the view of resonance stability in this paper. Firstly, the transfer characteristics of disturbances in Type-IV wind generators are analyzed to establish their impedance model, based on the balance principle of frequency components. Subsequently, considering the dynamic characteristics of the transmission network and the interaction among several wind farms, the resonance structure of a practical wind power base is analyzed based on the s-domain nodal admittance matrix method. Furthermore, the unstable mechanism of the resonance mode is further illustrated by the negative-resistance effect theory. Finally, the established impedance model of the Type-IV wind generator and the resonance structure analysis results of the wind power bases are verified through the time-domain electro-magnetic transient simulation in PSCAD/EMTDC. Case studies indicate that there is a certain resonance instability risk in large-scale wind power bases in a frequency range of 1–100 Hz, and the unstable resonance mode is strongly related to the negative-resistance effect and the capacitive effect of Type-IV wind generators.
Highlights
Wind energy will play an important role in the field of energy due to its clean and renewable characteristics
To verify the resonance structure analysis results, the oscillation phenomenon caused by the unstable resonance mode was reproduced based on the simulation model of the wind power bases
The wind power bases operate in the steady state, the parameters of wind farms were changed to the parameters used in the resonance structure analysis at t = 2.0 s
Summary
Wind energy will play an important role in the field of energy due to its clean and renewable characteristics. With the large-scale integration of wind power generation, some oscillation phenomena have appeared in wind energy power systems [2,3,4]. Due to the power electronic characteristics of wind generators, the oscillation frequency is distributed in a wide frequency range, which is very different from the previous oscillation phenomena in traditional power systems [5]. To guarantee the reliable and efficient development of wind power generation, it is necessary to investigate these oscillation problems in wind energy power systems, especially in the large-scale wind power bases with Type-IV wind generators. With the development of wind energy, large-scale wind power bases with Type-IV wind generators will be popular in future power systems
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