FREQUENCY FLUCTUATION MITIGATION SCHEME OF DOUBLY-FED WIND TURBINE GENERATOR BASED ON VARIABLE COEFFICIENTS

Yang Dejian; Xu Yien; Zheng Taiying; Zhang Xinsong; Hua Liang; Jin Zhaoyang

doi:10.19912/j.0254-0096.tynxb.2021-1572

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (4) : 173-179. DOI: 10.19912/j.0254-0096.tynxb.2021-1572

FREQUENCY FLUCTUATION MITIGATION SCHEME OF DOUBLY-FED WIND TURBINE GENERATOR BASED ON VARIABLE COEFFICIENTS

Yang Dejian¹, Xu Yien², Zheng Taiying³, Zhang Xinsong², Hua Liang², Jin Zhaoyang⁴

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Abstract

With the large-scale grid-connection of wind power, the stability of grid frequency has become one of the key problems that cannot be ignored. Doubly-fed induction generators （DFIGs） can mitigate the frequency fluctuations by releasing the kinetic energy from the DFIG and storing the kinetic energy into the DFIG, thus improving the frequency stability. The energy-releasing and energy-storing capabilities are different when DFIGs are operating in various speed conditions. Therefore, this paper suggests employing different variable gains during over-frequency and under-frequency periods, respectively. During the under-frequency period, the control gain is set to a linear function of the energy-releasing capability; during the over-frequency period, the control gain is set to a linear function of the energy-storing capability; and thereby mitigating frequency fluctuation and avoiding the issues of insufficient and excessive mitigation of frequency fluctuation. This paper established a test power system with DFIGs based on an EMTP-RV simulator. Simulation results indicate that the proposed strategy is valid.

Key words

wind power / frequency stability / DFIGs / energy-releasing capability / energy-storing capability / variable gain

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Yang Dejian, Xu Yien, Zheng Taiying, Zhang Xinsong, Hua Liang, Jin Zhaoyang. FREQUENCY FLUCTUATION MITIGATION SCHEME OF DOUBLY-FED WIND TURBINE GENERATOR BASED ON VARIABLE COEFFICIENTS[J]. Acta Energiae Solaris Sinica. 2023, 44(4): 173-179 https://doi.org/10.19912/j.0254-0096.tynxb.2021-1572

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