DC Microgrid Control Based On Event Triggering

In recent years,as a new form of power grid,DC microgrid has been widely used in new energy grid connection,ship system,electric vehicle networking and other fields.It has the advantages like: simple implementation,strong expansibility and wide application range.At the same time,due to the unstable characteristics of new energy and the dispersion of DC microgrid in physical space,the control of DC microgrid also faces many challenges.Firstly,this paper studies the control problem of networked DC microgrid with constant power load against actuator fault.By using the nonlinear method to model the constant power load,a DC microgrid model against actuator faults is obtained based on the transfer function.In order to solve the problem of large network burden and low communication efficiency,a new event triggering mechanism is introduced.Through simulation comparison,the event-triggered controller can effectively stabilize the DC microgrid considering actuator failure,and can use network resources more efficiently and reduce network loads effectively.Secondly,this paper further studies the actuator fault problem of DC microgrid.The finite-frequency domain fault problem of DC microgrid is studied.A networked DC microgrid fault detection filter is studied and designed.Through simulation verification,the fault filter can effectively detect faults.At the same time,by introducing a new pre-average event-triggered mechanism to the fault filter,the number of network communications of the filter is effectively reduced while ensuring the effect,and the network load is effectively reduced.The reliability and universality of the pre-average event triggering mechanism proposed in this paper are further verified.Finally,this paper studies a special form of DC microgrid-microgrid containing electric vehicles.By introducing three representative load frequency control modes of electric vehicles and SOC control to characterize the behavior of vehicle owners,the modeling of the networked microgrid containing electric vehicles is completed.Considering the high demand for safety and reliability of electric vehicle control,deception attack,a common form of network attack,is introduced into the model.Finally,a simulation verifies the reliability of the designed networked controller for the microgrid system including electric vehicles.In general,this paper takes the DC microgrid as the background and the new event-triggered mechanism as the clue.The controller design and filter design of different forms of DC microgrid systems against actuator faults and limited network bandwidth are studied.