The power electronic building block（PEBB）-based converter is the ideal solution for interfacing different portions of the network in power distribution systems. Standardization of the hardware and software was the key technology for PEBB. Therefore

we systematically summarized various kinds of topologies of the PEBB. Considering the high voltage and high capacity application

we designed a three-level H-bridge PEBB

and the converter built by the three-level H-bridge PEBB could realize the energy interface of the DC high-voltage transmission and distribution network. Meanwhile

we put forward a universal distributed multilayer control architecture. Therefore

the PEBB with this standardization controller had the ultimate flexibility. A megawatt experimental prototype was made with this PEBB

and some dynamic and static experiments were perforemed. The results indicated that the output voltage ripple is less than 3.5%

the dynamic voltage fluctuation is less than 14%

and the recovery time is less than 13 ms. Therefore

the designed PEBB and the multilayer controller can build large capacity converter

and the related functions were also achieved at last.