Active source-load control method for microgrid based on distributed control mode

Abstract

With the development of new power system, more and more distributed new energy devices are connected to the power grid, and many microgrids have emerged to achieve source-load balancing by controlling distributed power sources. The cooperative interaction among multiple microgrids greatly improves the reliability of power supply and load recovery speed of microgrids, and in this process, it is necessary to clarify the recoverable power-loss loads of each microgrid and the sequence of load restoration. Therefore, this paper proposes an active source-load control method for microgrid based on distributed control mode. Firstly, the source-load control architecture of multi-microgrid collaboration is described, including the upper layer control mode composed of sub-microgrid control hub intelligences and the lower layer control mode composed of micro-source intelligences. Secondly, the microgrid load importance model is established, as well as the method of determining the restoration order of the power-loss loads. Again, the consistency calculation method under the distributed control model is proposed, and the power distribution and corresponding frequency compensation between the micro power supplies connected to each microgrid are determined through the consistency calculation. Finally, the calculation example verifies the effectiveness and scientificity of the method proposed in this paper, which provides important technical means for active source-load control of microgrid and has high engineering application value.