First of all

an effective topology is established

which is through SPWM modulation rectifier output andfull bridge inverter circuit AC output

the power grid analog output of various conditions is achieved. Secondly

theintegrated loop control strategy and the programmable waveform generator based on DSP + FPGA are adopted toachieve good output characteristics. Thirdly

establish the four quadrant operation mode

energy feedback can real-ize direct test process

reduce the loss. Finally

the experimental results prove the feasibility and correctness of thedevice

as well as the low voltage ride through

harmonic generation

islanding detection and other special func-tions. This device basically solves a series of problems such as low switching frequency

poor quality of voltage wave-form

slow response speed

serious energy consumption

difficult heat dissipation and so on

and realizes the effi-cient and accurate test requirements of grid connected inverter.