Study on Interactions of DFACTS Devices Operating in Distribution System

Abstract

As distribution flexible AC transmission system (DFACTS) technology is an economic and effective means to improve the power quality, the applied DFACTS devices are increasing. Therefore, the interactions among the DFACTS controllers should be considered. The paper establishes the linearized model of a single-load infinite-bus distribution system installed with a distribution static var compensator (DSVC) and a distribution static synchronous compensator (DSTATCOM), and the system transfer function can be obtained based on this model. Then, uses the relative gain matrix (RGA) method to analyze the interactions under different electrical parameters, drawing a conclusion that the interactions w ill be weakened when the electrical distances are increased and vice versa. The simulation results verify the effectiveness of the proposed model and the RGA method.