Output Control Method of Microgrid VSI Control Network Based on Dynamic Matrix Control Algorithm

In recent years, the power control method of the primary control layer in a microgrid hierarchical control system has substantially improved. However, the corresponding improvement in the dynamic response performance of the output controller remains challenging in the field of microgrid research. In this study, based on the topology of a microgrid control system, a control network was constructed with a voltage source inverter (VSI) control node as its main body. After analyzing its characteristics, the dynamic response capability of the primary layer was determined to be limited because the complex control network that comprises multiple proportional-integral (PI) controllers inherits and amplifies the PI controller dynamics. In this study, we replaced the VSI output controller in the conventional control structure with a dynamic matrix control (DMC) algorithm to reduce the number of PI controllers, maintain the existing power stability control and improve the dynamic response performance of the primary VSI node. The effectiveness and advantages of the improved output controller of the VSI node based on the DMC algorithm were verified by comparing simulations and experiments that were conducted in the same environment. The simulation and experimental results show that the response speed of the DMC-based VSI node was improved, and the overshoot, fluctuation, and steady-state errors in the response process were reduced.