Abstract
Subsynchronous oscillation (SSO) is a critical issue for the direct-drive permanent magnet synchronous generator (D-PMSG) based wind farm integrated to a weak onshore AC grid. To analyze the mechanism of the SSO phenomenon of D-PMSG based wind farm, widely used impedance-based stability analysis method is utilized in this paper. First, the impedance model based on the harmonic linearization theory of grid-connected D-PMSG is proposed, and the mechanism of sub/supsynchronous currents coupling is analyzed quantitatively for the first time. Then, based on the impedance model and relative stability criterion, the influence of wind farm operating parameters and grid impedance on stability is discussed. Simulations are carried out to verify the correctness of theoretical analysis.
Highlights
Renewable energy generation has been developing rapidly all around the world due to the depletion of traditional energy and serious environmental pollution
A new type of sub/supsynchronous oscillation which had no relation with series compensation was detected the drive permanent magnet synchronous generator (D-PMSG) based full-converter wind farm in Xinjiang, China, in July 2015 [12,13]
Reference [19] built the impedance model of grid-connected voltage source inverter (VSC) and it was further developed in Reference [20] to describe impedance characteristics of LCL-type converter, but the stability analysis was not mentioned in both articles
Summary
Renewable energy generation has been developing rapidly all around the world due to the depletion of traditional energy and serious environmental pollution. Due to the reverse distribution of the energy and power load in China, the renewable energy, mainly based on the large-scale of wind and solar power, long-distance high voltage direct current (HVDC) transmission system and series compensation transmission lines are widely utilized in nowadays power grid. A new type of sub/supsynchronous oscillation which had no relation with series compensation was detected the D-PMSG based full-converter wind farm in Xinjiang, China, in July 2015 [12,13]. Since the natural torsional frequency of shafting vibration in direct drive permanent magnet synchronous generator is very low (1–10 Hz), and the generator and power system are isolated by back-to-back PWM converter, subsynchronous torsional interactions (SSTI) will not occur in D-PMSG based wind farm
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