A three-phase power electronic converter for grid integration of distributed generation

We designed a flexible DSP-controlled three-phase power electronic converter for the integration of distributed energy generation into networks. The further increase of energy conversion from renewable energy sources demands a share of the conventional centralized grid control. This requires a fast and flexible control system. Our converter consists of two IGBT inverter bridges, a diode rectifier bridge and an IGBT-chopper. The control is realized with a 32-bit, floating point digital signal processor (DSP). This DSP is not originally designed for drive control applications, so some difficulties had to be overcome. The system structure, the special problems resulting from the use of a non-specific DSP-system and the implementation of the inverter control are described.