Influence of load fluctuation in AC/DC interconnected distribution system on electric power quality

AC/DC interconnected system becomes the development direction of interconnected distribution network for many distributed energies and AC/DC loads with the continuous development of renewable energy and DC load. There are many AC-DC, DC-DC and DC-AC converters in typical AC/DC interconnected system, AC/DC bus bars at many voltage grades are formed to satisfy the connection demand among different sources-loads. Many converters may increase the harmonic component of the system and reduce the electric power quality on the one hand. There may be mutual influence on voltage fluctuation among AC/DC bus bars at various voltage grades, and the pass-through effect of electric power quality problem may be formed on the other hand. A typical AC/DC interconnected system topology structure is taken as an example in the paper. The influence of load fluctuation of different distribution bus bars on related electric power quality of bus bar is explored, thereby reference and suggestions can be put forward for the load operation of the system.