A Novel Event-Triggered Secondary Control Strategy for Distributed Generalized Droop Control in Microgrid Considering Time Delay

With the wide use of new energy and power electronic devices, the problem of low inertia of microgrid (MG) is becoming more and more prominent. In order to solve the problem, this article proposes an event-triggered secondary control strategy for distributed generalized droop control (GDC) considering time delay. First, a distributed event-triggered active power and frequency controllers are established based on GDC, and a distributed voltage controller is designed based on droop control. Second, due to the different frequency parameters of each distributed generator (DG), the tracking controller of frequency and frequency reference model is established by using heterogeneous multiagent theory. Third, the event-triggered function of communication between DGs is constructed, and the stability of the proposed controller is proved. The complicated Lyapunov equation is avoided in the proof process. Finally, the effectiveness of the controller is verified by simulation. The simulation results show that the controller effectively realizes the secondary adjustment of frequency and voltage, reduces the number of communications, and increases the inertia of MG.