RESEARCH ON MICROGRID OPERATION CONTROL STRATEGY BASED ON SELF-RECOVERY DROOP CONTROL
For the problem of system frequency and voltage fluctuations caused by the switching of grid-connected and off-grid modes,the mutation of micro-source and the disturbance of load conditions,the self-recovery droop control strategy of frequency and voltage is proposed.Firstly,the self-recovery droop control model of energy storage unit is established based on the traditional droop control by introducing frequency difference and voltage difference as feedback links.Secondly,the performance of self-recovery and traditional droop control coefficients are compared and analyzed in different frequency bands by Bode diagram.The self-recovery droop control has better effect of system frequency and voltage self-recovery due to the adopting of PI control and the introduction of correction droop coefficient factors,which improves the dynamic adjustment capability and shows better adaptability.Finally,a 35 kV wind-solar-storage microgrid model is established based on Matlab/Simulink,and the effectiveness of the self-recovery droop control strategy is verified by time-domain simulation experiments.
microgridgrid-connected and off-gridself-recovery droop controlBode diagramwind-solar-storage
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