Research And Application Of Operation Control Technology In Low Voltage Microgrid

Distributed generation(DG)has less pollution,high energy utilization rate,flexible installation and transportation and distribution of resources and less transmission line loss of the unique advantages,gradually become the powerful supplement for large-scale power grid and effective support,the future trend of power system.However,when the high permeability distributed power supply is connected to the centralized large power grid,it will cause a series of new problems such as stability,control and protection.This paper mainly implementation scheme of Yanqing intelligent originates from the author engaged in micro power grid construction project,the author analyzes and researches on operation control technology scheme of Yanqing micro power grid project,and the implementation and application of Yanqing micro power grid project to do detailed introduction.(1)the basic control strategy of microgrid is introduced,and the traditional droop characteristic based on the interconnection line is introduced,and the improved algorithm on this basis and the power transmission characteristics of parallel inverters are introduced.(2)the theoretical analysis of three-phase voltage source inverter and the research of adaptive damping strategy.Inverter is the core of the micro grid system,this paper focuses on the establishment of mathematical model of three-phase voltage type inverter in the DQ axis,and then introduces the design of adaptive damping strategy of inverter control unit and simulation verify its feasibility and effectiveness.(3)the analysis of the small signal model of parallel inverter.Because of some parameters of the inverter,the output line impedance and the load impedance,the control parameters,such as droop gain and power filter constant,have great influence on the stability of the system.(4)analysis of the simulation model of Yanqing microgrid project.First,the simulation of a single micro power supply is carried out to verify the correctness of the control method,and then the whole system scheme is verified,and the operation results of the micro grid project in Yanqing are analyzed and explained.The simulation results verify the effectiveness and feasibility of the proposed strategy and the system level control of microgrid.In this paper,the research and application of the operation control technology of Yanqing microgrid project has certain scientific significance,and has strong practical significance and great application value.