Power Quality Comprehensive Evaluation for Low-Voltage DC Power Distribution System

With the development of low-voltage DC (LVDC) power distribution system and more and more strict requirements on power quality of consumers, it has been more and more important to give a power quality comprehensive evaluation method for LVDC power distribution system. However, the existing comprehensive method of power quality, which focuses on AC power system, is not applicable to DC power distribution system well. In order to study DC power distribution system better and improve the power quality problems effectively, a new power quality comprehensive evaluation method for LVDC power distribution system should be put forward. This paper establishes the comprehensive evaluation indicator system for LVDC power distribution system, adopts the comprehensive weighting method combined with analytic hierarchy process (AHP) and entropy weight coefficient method, and applies grey relational analysis (GRA) in the comprehensive evaluation of power quality. Finally, a case study shows that the proposed comprehensive evaluation method can effectively evaluate the power quality of the object.