A Novel Reactive Power Compensation Configuration of&nbsp; Wind Farms on Inhibiting DFIG Fleet Off-Grid

MA Rui; WANG Keyi; WU Gang

doi:10.3969/j.issn.1000-7229.2015.05.003

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Electric Power Construction ›› 2015, Vol. 36 ›› Issue (5) : 14-19. DOI: 10.3969/j.issn.1000-7229.2015.05.003

A Novel Reactive Power Compensation Configuration of Wind Farms on Inhibiting DFIG Fleet Off-Grid

MA Rui¹, WANG Keyi², WU Gang³

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Abstract

Along with the increasing scale of wind power, the electric grid stability and safety problems in wind farms have become increasingly prominent due to the DFIG （doubly-fed induction generator） fleet off-grid under grid failure conditions. In order to inhibit DFIG fleet off-grid, this paper presented a wind farm reactive power compensation configuration method with considering the inhibition of DFIG. Firstly, the wind farms were taken as the center to analyze the reactive power balance. Using the quantitative relationship between reactive power demand and active transport, this paper calculated the needed capacity of low-voltage reactor bank and low-voltage capacitor bank in wind farm. Secondly, through the reactive analysis on the fluctuation of wind power output under different load modes and the bus voltage of wind farm during N-1 line running, this paper checked the adaptability of initial configuration scheme to the systems static security. Finally, based on the analysis on the reactive power demand characteristics of DFIG fleet under grid failure condition, this paper added a STATCOM （static synchronous compensator） with certain capacity to inhibit the fleet off-grid, which could make the reactive power compensation scheme meet the safe operation requirements of the system. The proposed method has been used to configure the reactive power compensation in 220 kV wind farm with large capacity in a province, which can prove its feasibility and effectiveness in economy and technology.

Key words

reactive power compensation / wind farm / power grid fault / capacitor bank / STATCOM

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MA Rui, WANG Keyi, WU Gang. A Novel Reactive Power Compensation Configuration of Wind Farms on Inhibiting DFIG Fleet Off-Grid[J]. Electric Power Construction. 2015, 36(5): 14-19 https://doi.org/10.3969/j.issn.1000-7229.2015.05.003

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