Coordinated Optimization Control Method of Multi Microgrid Cluster System And Distribution Network*

The multi-microgrid interconnection structure can achieve energy coordination among multiple microgrids and form energy complementary advantages. In order to improve the voltage stability of microgrid interconnection system, this paper aims at the problem of output uncertainty of distributed power sources in multi-source microgrid under the influence of weather changes. The reactive power coordination method between microgrids based on microgrid interconnection structure is studied. The reactive power support algorithm of distribution network under the condition of distributed power output fluctuation in microgrid and energy coordination difficulty between microgrids is studied. The interconnection control strategy between microgrids is established based on voltage update and voltage deviation control rate. An energy exchange control strategy between microgrid and distribution network based on microgrid virtual control and prediction error is established. The improved three-machine nine-node topology model is used to verify the voltage coordinated control model and algorithm established in this paper. The simulation results show that the voltage coordinated optimization control method proposed in this paper can effectively reduce the voltage fluctuation of microgrid and the reactive power exchange between microgrid and distribution network.