Droop Control for Energy Storage Inverters Based on Adaptive Filtering Time Constant
The energy storage inverter under typical droop control has a problem of excessive frequency change rate when being disturbed,while the droop control using low-pass filters has an oscillation problem.Therefore,a droop control strategy for energy storage inverters based on adaptive filtering time constant was proposed.Firstly,the small-signal modeling of output frequency of droop-controlled energy storage inverter including filter was derived and established.Then,the root locus method was used to analyze the influence of filter time constant on its stability.Further,a droop control strategy with adaptive filter time constant was put forward,and the parameter design criteria were given.Finally,the proposed strategy was validated through MATLAB/Simulink simulation.The results indicate that the proposed method can effectively reduce the frequency change rate and suppress oscillations,thereby reducing the risk of distributed power supply offline.
energy storage inverterdroop controlsmall signal stabilityroot locus methodadaptive filtering
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