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Open AccessArticle

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

1
State Grid Shaanxi Electric Power Research Institute, Xi’an 710100, China
2
School of Electrical & Electronic Engineering, North China Electric Power University, Changping District, Beijing 102206, China
*
Authors to whom correspondence should be addressed.
Energies 2019, 12(6), 1081; https://doi.org/10.3390/en12061081
Received: 9 January 2019 / Revised: 10 March 2019 / Accepted: 18 March 2019 / Published: 20 March 2019
(This article belongs to the Special Issue Electrical Engineering for Sustainable and Renewable Energy)
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. View Full-Text
Keywords: oscillation propagation factor; DFIG; subsynchronous oscillation; interharmonics; frequency characteristic oscillation propagation factor; DFIG; subsynchronous oscillation; interharmonics; frequency characteristic
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MDPI and ACS Style

Wen, Z.; Peng, S.; Yang, J.; Deng, J.; He, H.; Wang, T. Analysis of the Propagation Characteristic of Subsynchronous Oscillation in Wind Integrated Power System. Energies 2019, 12, 1081.

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