Optimal control of power quality for microgrid grid-connected converters based on situation awareness and orientation

The distributed generator and non-linear loads will lead to deterioration of power quality at the point of common coupling between microgrid and low voltage distribution network. Tracking and compensating for the power quality problem of the converter is a means to ensure the safe and stable operation of microgrid. At present, the research on power quality problems basically adopts the strategy of pre-emptive and post-processing, which can not guarantee the continuous and stable operation. Based on this, an advanced converter with situation awareness and orientation function is proposed. It is mainly carried out in three aspects: awareness, decision-making and execution. The situation awareness of the elements related to power quality is realized through the establishment of the information management system and the optimization of the prediction algorithm. The decision model of grid-connected converter and the optimal control are used to realize the active decision of the problem. The situation orientation of power quality problem is realized by establishing a smooth switching model of adaptive control strategy. This paper provides a new idea for more effective management of power quality problems in microgrid.