Abstract
Distributed cooperative control methods are widely used in the islanded microgrid control system. To solve the deviation of frequency and voltage caused by the droop control, it is necessary to recovery the frequency and voltage to the rated value using a secondary control strategy. However, the traditional communication method relies on the continuous periodic one, which makes the communication burden of the islanded microgrid system heavy and conflicts with the actual operation of the power grid. Using the secondary recovery control method based on the distributed event-triggered method, we conserve communication resources by reducing the number of transmissions of sampled data and achieving the recovery control of the frequency and voltage and the original proportional sharing of active power. In addition, we analyze the stability of the distributed event-triggered strategy and build a microgrid system with MATLAB/Simulink to verify the effectiveness of the control method. Furthermore, we compare with a traditional periodic communication system and demonstrate the superiority of our distributed event-triggered approach.
Highlights
The of communication topology used by this control system was conHz islanded microgrid test system in Figure was developed in the MATLAB/Simulink nected and included a directed spanning tree
1.1 αω αv According to [11,12], the islanded microgrid test system shown in Figure 4 was equivalent to multiagent system (MAS)
Traditional Event-triggered Traditional Event-triggered event-triggered control realized the frequency and voltage recovery of the islanded microgrid, and satisfied the sharing of active power according to the original proportion
Summary
In order to solve the frequency and voltage deviation problems caused by droop control to the microgrid system, an effort must be made to eliminate or reduce these deviations during the secondary control. WU Beibei and Alexander Micallef use a centralized control method to send a control signal to the primary controller, which can achieve voltage and frequency stability [8,9]. It has a high demand for the microgrid central controller and communication environment. In order to reduce the dependence on the microgrid controller and the communication network, Xin Huanhai proposes the use of a fully distributed method of hierarchical control.
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