The interaction between voltage-source converters,DC lines and constant power loads(CPLs)leads to high-frequency oscillation instability in low-voltage DC systems.For this reason,a normalized reduced-order model applicable to the analysis of high-frequency oscillations of the system is established in this paper,with the causes of the high-frequency oscillation instability of the system explained from the perspective of the normalized reduced-order model.On the basis,an analysis method of feasible region of control parameters that can inhibit high-frequency oscillations is proposed.This feasible region cannot only present visually the low-frequency stability or high-frequency instability regions of the system under different control parameters,but also show customized design curves of the system-level dynamic characteristics(oscillation frequency and damping factor)in detail in the stability region.Finally,the simulation example of the low-voltage DC system is built via PLECS software,with the validity of the normalized reduced-order model and the feasible region of control parameters verified by multiple sets of simulation time domain results.
关键词
低压直流系统/高频振荡/统一化降阶模型/控制参数/可行域
Key words
low-voltage DC system/high-frequency oscillation/normalized reduced-order model/control parameters/feasible region
维普
万方数据