期刊
IEEE TRANSACTIONS ON POWER DELIVERY
卷 35, 期 4, 页码 1928-1938出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPWRD.2019.2957005
关键词
Doubly fed induction generators; Oscillators; Power system stability; Phase locked loops; Voltage control; Power system dynamics; Analytical models; Sub-synchronous oscillations; grid-connected DFIG; torsional dynamics of synchronous generators; weak grid connection
资金
- State Grid Corporation of China (Oscillation risk analysis and simulation technology research of wind power generator groups and flexible HVDC interconnection system) [NYB17201800102]
This paper analytically examines how the condition of weak grid connection affects the torsional sub-synchronous oscillations (SSOs) induced by a grid-connected DFIG in a power system. The examination focuses on the SSO mode of grid-connected DFIG, which is dominated by the phase locked loop (PLL) or DC voltage control. Theoretical analysis is carried out to prove that the condition of weak grid connection amplifies the impact of modal resonance between the DFIG and torsional dynamics of synchronous generators. The amplifying effect of weak grid connection exhibits as the decrease of damping of SSO mode of DFIG and increase of the associated residue when the grid connection weakens. Consequently, the DFIG is more likely to induce torsional SSOs under the condition of weak grid connection, leading to system instability in the worst case. Analytical examination presented in the paper reveals the mechanism about how the condition of weak grid connection plays a key role for the DFIG to induce the torsional SSOs. An example multi-machine power system with the grid-connected DFIG is presented. Results of modal analysis and non-linear simulation using detailed model of DFIG validate the analysis and conclusions made in the paper.
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