计及无功支撑特性的新能源多馈入系统小干扰电压支撑强度评估OA

In high-penetration renewable energy multi-infeed systems(multi-infeed systems),large-scale integration of power electronic converters may lead to small-signal stability issues.Assessing system voltage support strength(system strength)is a critical tool for analyzing such problems.To address the limitations of existing researches that often neglect the reactive power support characteristics of converters and actual operating conditions,this paper proposes a small-signal stability analysis and system strength evaluation method for multi-infeed systems.First,a small-signal model of the multi-infeed system is established,incorporating both reactive power support characteristics and actual operating conditions.Second,an equivalent homogeneous multi-infeed system is constructed using the participation factor weighting method.Furthermore,based on modal decoupling theory,an equivalent single-infeed system is derived to characterize the small-signal stability of the multi-infeed system.Finally,a system strength evaluation metric accounting for reactive power support is proposed,and quantitative evaluation procedures are designed for both white-box models(with known control structures and parameters)and black-box models(with unknown control structures and parameters).Simulation results demonstrate that the proposed method can accurately evaluate system strength and exhibits good engineering applicability.