The invention discloses an automatic droop control method for microgridinvertersbased on small-signal stability analysis. On the basis of actively adjustingthe slopesof P-f and Q-V droop curves, the control method introduces small-signalstabilityanalysis to verify the feasibility of the actively adjusted slopes, therebyrealizingno-deviating adjustment of voltage and frequency on the premise ofguaranteeingsystem stability. For distributed power sources under droop control in anislandingstatus, the automatic droop control method for microgrid inverters based onsmall-signal stability analysis involves varying an active power referencevaluecorresponding to a rated frequency and a reactive power reference valuecorresponding to a rated voltage in the droop curves by automaticallyadjusting theslopes of the droop curves, thus meeting the requirements of load changes andrealizing no-deviating adjustment of frequency and voltage; besides, the sloperangesof the droop curves allowed by stable system operation are obtained throughthesmall-signal stability analysis; the ranges should be satisfied during theautomaticadjustment of the droop slopes so as to prevent system instability caused byunilateralrealization of no-deviating adjustment of frequency and voltage.
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