FULLY DISTRIBUTED SECONDARY FREQUENCY CONTROL STRATEGY FOR ISLAND MICROGRIDS BASED ON IMPROVED VIRTUAL LEADER NODE
In view of the conventional distributed secondary frequency control strategy that will cause the frequency of the microgrid system to fail to recover when the frequency information of the virtual leader node fails,a fully distributed secondary frequency control strategy is proposed and designed.Firstly,the influence of virtual leader node failure on the secondary frequency control process in conventional distributed secondary frequency control strategy is analyzed.Then,combined with the consensus algorithm,the conventional distributed secondary frequency control controller is improved,and the cancellation of the frequency modulation compensation amount and the frequency deviation is added to each distributed controller as a"frequency guidance item",so that the distributed generators are completely equal,so as to ensure the normal recovery of the frequency after the virtual leader node is removed,and realize complete distributed control.Finally,the effectiveness and superiority of the proposed method in ensuring frequency recovery are verified by simulation.
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