MMC-based Power Coordination Control Between Subnets In AC/DC Hybrid Microgrid

The construction of a new type of micro grid power applications in the future in the market share of more and more important,for efficient use of micro power grid also gradually walk to people's field of vision,in order to better use the micro grid for a variety of power supply of the inconvenience caused by the supply of high quality electrical energy,in this paper,based on the modular multilevel converter new application environment,for the modular multilevel converter groundbreaking work in micro grid environment.Based on the micro sources under different characteristic curves as energy supply sources,a new power network model is constructed.Through the analysis of pulse width modulation,the carrier phase shift pulse width modulation technology is applied as the core control technology and the idea of hierarchical control is adopted to provide theoretical basis for various control conditions.The main work of the author is as follows1.Build a new microgrid structure model,expand the application of the new microgrid structure,replace the modular multilevel converter as a new high-quality converter in the traditional microgrid structure,and add an energy storage device as a nearby energy compensation device in the construction,It lays a foundation for the energy saving optimization of the new structure of microgrid.2.The pulse width modulation technology is adopted as the main control means,and the priority correlation of carrier phase shift Angle for system control is explored through the Fourier transform of the modular multilevel converter,and the power control and harmonic control of the microgrid are further carried out by using the carrier phase shift modulation technology.3.For the power control scheme,the layered control scheme is adopted,and for the system,the four-level control is adopted.Each level adopts its own corresponding control conditions to avoid the interference of the mutual influence of control conditions on the stable operation of the system.4.Simulate the whole system structure,and use the research scheme to systematize the simulation results obtained,meet the corresponding conditions for the smooth operation of the system,and obtain the feasibility of the modular multilevel converter in the expansion of the application of micro-grid structure.The experimental results show that the modular multilevel converter technology can achieve good transient performance and high stability for the stable operation of the system.