Voltage Stability Control Based On Event-Driven For Microgrid

Research on Microgrid can help to develop and utilize renewable distributed energy,alleviate the pressure of energy crisis and environmental pollution,but the current technology of microgrid is not mature enough to meet the needs of users.The main reason for this kind of problem is that distributed energy in microgrid is mostly intermittent,and its output energy will change with the change of time or environmental conditions.The change of output energy will lead to voltage fluctuation in microgrid.In order to solve this kind of voltage fluctuation problem,the main research work in this paper is as follows:Firstly,the linear system model of microgrid is established.In the process of modeling,tracking and disturbance suppression are involved in order to stabilize the output voltage of the microgrid model near the rated value.Although the introduction of servo compensator can solve these two problems at the same time,this method needs to know the internal model of the disturbance and implant it into the servo compensator.Because the perturbation itself is an unknown quantity,the structure of the internal model is often not known clearly.Then,this paper combines event-driven idea with feedback control,hoping to solve the tracking problem without knowing the disturbance internal model.The output variables of the linear system are detected according to a certain time interval,and events are designed according to the fluctuation degree of the output variables.Accordingly,three kinds of events with different severity are designed,corresponding to each event,and the corresponding control intensity is given to stabilize the output variables in the linear system.When the output of the controlled object exceeds the set area,the control method updates its output.When the output of the controlled object is within the set area,this control method will not update its output,and directly continue the output of the last event until the next event occurs because of disturbance or change of reference value.Finally,on the premise of achieving voltage stability effect,the cost functions of the proposed microgrid model are compared.The conclusion is that this event-driven feedback control method not only stabilizes the voltage of the microgrid,but also saves the output power of the energy storage device.This makes the research more academic and practical.