Mechanism of sub‐synchronous interaction caused by inter‐harmonics in DFIG

Wen, Tao; Huang, Yao; Zhao, Dan; Zhu, Lingzhi; Wang, Xitian

doi:10.1049/joe.2017.0458

Cited by 2 publications

(2 citation statements)

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“…The synchronous generator and its excitation system use a fourth order model. The linearized synchronous generator state equation is (8).…”

Section: The Linearization Modelmentioning

confidence: 99%

“…Reference [7] shows that the DFIG can act as a source of significant subsynchronous interharmonic current emissions. When the interharmonic current is injected into the grid, it will cause voltage, current and power to oscillate, causing various faults and the instability of the power system [8]. Subsynchronous oscillation caused by DFIG has been studied in terms of damping and impedance, such as eigenvalue analysis [9,10], frequency scanning method [11,12], and equivalent impedance [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the Propagation Characteristic of Subsynchronous Oscillation in Wind Integrated Power System

Wen¹,

Peng²,

Yang

et al. 2019

Energies

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This paper proposes oscillation propagation factors to analyze power oscillations caused by the interharmonics of doubly fed induction generators (DFIG) at different points in the power system. First, a dynamic model of the DIFG is built, including the asynchronous generator, its transmission system, converters and the control systems. Then, the state space expression is formed by deducing the input and output matrices. From this, the oscillation propagation factor is proposed and denoted to exhibit the propagation mechanism of interharmonics in the view of frequency domain, by deducing the multi-input-multi-output transfer functions matrix. Along with this, the sensitivity of propagation is calculated for adjusting the parameters to block the oscillation propagating path. Finally, the modified four machine system with two DFIGs and the New-England 39 bus system with two DFIGs is used as a test system to verify the effectiveness of the oscillation propagation factor. From this the simulation results demonstrate that the subsynchronous interharmonics of DFIGs injected into the grid will propagate to the different points of the system and results in oscillation of the power. The oscillation propagation factor could quantize the oscillation magnitude propagating from one point to other point in the wind integrated power system.

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“…The synchronous generator and its excitation system use a fourth order model. The linearized synchronous generator state equation is (8).…”

Section: The Linearization Modelmentioning

confidence: 99%