Multi-microgrid Coordination Control And Its Communication System

With the increasingly obvious drawbacks of the traditional power grid,microgrid is a useful complement to the traditional power grid,which not only meets the user requirements of power quality and reliability,but also organizes effectively various distributed generation unit.Currently,the coordinated control of microgrid have various control strategies,while there are also a variety of control methods with distributed generation.However,how to manage the multi-microgrid in each case has some issues,which the division of functionality is not clear and how to configure communication.Therefore,this paper focuses on microgrid hierarchical control and its communication system,and related microgrid experiments are carried out in laboratory experiments.Firstly,in relation with the inverter main circuit topology,PQ control,droop control and V/f control of distributed generation are analyzed.Based on control thought of control methods,the expression is given and the specific control block diagram of inverter is designed.Finally,the simulation proved the correctness of the controller design.Secondly,according to requirements of management and control of laboratory double microgrid,hierarchical control strategy and task of the microgrid control are analyzed at all levels.Coordinated control strategy is established at all level and experimental researches are discussed among them.The power sharing of distributed generation is derived and the actual presence of the microgrid operation is proposed.On this basis,a reactive power sharing strategy based on multi-microgrid coordination controller is proposed,finally the correctness of this strategy and feasibility of RT-LAB in distributed generation's simulation is verified by simulation.Finally,to effectively control the microgrid,it is necessary that microgrid is supported by communication system.The distributed generation internal communication,microgrid internal communication and communication between microgrid and internet are proposed to configure the microgrid.According to the communication infrastructure in laboratory microgrid,microgrid data monitoring program is designed and carried out experiments to verify.