Admittance Modeling of DFIG-WT with Stator Current Control Considering PLL and DC Bus Dynamic
2022 IEEE International Power Electronics and Application Conference and Exposition (PEAC)(2022)
摘要
Direct stator current control (SCC) has wide application prospect in wind power systems based on doubly-fed induction generation (DFIG) duo to the advantage that the reference current is not affected by generator parameter drift. However, the oscillation characteristic between SCC-controlled DFIG and series compensation line seriously hindering the safe consumption of wind power. In this paper, the small signal transfer law of SCC-DFIG is deeply analyzed. Moreover, the admittance models are established to accurately characterize the frequency domain characteristics of SCC-DFIG by taking into account the influence of multi-time scale dynamic characteristics such as phase locked loop (PLL), dc bus dynamic and frequency coupling. Theoretical analysis and simulation results show that the grid-connected oscillation risk of SCC-DFIG is higher than DFIG with rotor current control (RCC). The stability evaluation results can provide reference for the formulation of inhibition strategy and stable operation of SCC-DFIG.
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关键词
stator current control,dc bus dynamic
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