The PRE20 series regenerative programmable all-in-one AC source & electronic load adopts a new-generation SiC four-quadrant bidirectional power conversion topology. One single unit integrates two core functions: programmable AC grid simulator and regenerative AC electronic load, enabling bidirectional four-quadrant flow of active and reactive power. Energy fed back from the DUT can be inverted and recycled back to the utility grid with a maximum regeneration efficiency of 91%, saving over 70% energy compared with conventional resistive dissipative electronic loads, and significantly cutting workshop heat dissipation and long-term power consumption costs.