Addressing the issue of high-frequency oscillation instability in DC microgrids caused by unreasonable virtual inertia control parameters,a low-pass filter equivalent modeling approach is proposed.This approach establishes a reduced-order model of the DC microgrid and its voltage closed-loop transfer function.From the perspective of ensuring the small-signal stability of the DC microgrid,the concept of a feasible region for virtual inertia parameters is defined in the parameter space,with droop coefficients and low-pass filter control bandwidth as the primary parameters.Based on the zeros and poles obtained from the voltage closed-loop transfer function,a method for solving the feasible region of virtual inertia parameters is proposed.This feasible region provides practical guidance for the design of virtual inertia control parameters in DC microgrids.Finally,a simulation case of a DC microgrid based on a switching model is built using PLECS software.Multiple simulation results have verified the effectiveness of the reduced-order model and the feasible region of virtual inertia control parameters.
关键词
直流微电网/降阶模型/高频振荡/虚拟惯性参数/可行域
Key words
direct current microgrid/reduced order model/high frequency oscillation/virtual inertia parameters/feasible region
维普
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