SVG控制模式对新能源场站宽频振荡作用机理分析及工程实践(一):阻抗建模与机理分析OA

With the large-scale grid integration of renewable energy(RE)generation,frequent occurrences of broadband oscillations have been observed in RE plants.RE plants incorporate devices such as static var generators(SVG)besides wind turbines and photovoltaic(PV)generation units.Analytical models and mechanistic understanding remain deficient in characterizing the impact pathways and dominant contributing factors of SVG control modes on broadband oscillations in RE plants.This paper first constructs the small-signal transfer relations of SVG under different control modes(reactive power control mode and AC voltage control mode),establishes a three-port network model comprising RE generation,SVG,and the power grid.Subsequently,quantitative analysis is conducted to determine the causes of impedance charac-teristics discrepancies under different SVG control modes and their impacts on system impedance,and the influence patterns of SVG control modes on RE plant oscillations is revealed.Finally,simulation experiments on the impact of dif-ferent SVG control modes on broadband oscillations in RE stations were conducted based on the MATLAB/Simulink simulation platform,verifying the correctness of the analytical conclusions.