Research on Power Electronic Load: Topology, Modeling, and Control

A novel power electronic load (PEL) is introduced in this paper. This equipment can simulate R,L,C load as well as non-linear load. Furthermore, it can recycle the energy back to grid. Topology for single phase AC PEL, three-phase AC PEL, and DC PEL are presented firstly. Based on disadvantages of repetitive controller, an improved repetitive controller is presented to improve the dynamic performance of the system. Relative problems in back to back system are analyzed and mean filter is adopted to eliminate the harmonics in DC loop. The whole efficiency can be as high as 80%-90%. Simulation and experimental results are carried out to validate the effectiveness of the proposed control strategy.