Design Of Control Software For Converter Of Direct-driven Magnet Wind Power Generation System Based On Data Flow

In the21th century, the impact of energy crisis has become more serious. Boththe normal life of the public and the economy development depend mostly on theenergy. However, nowadays the available energy, such as fossil fuel, is not the kind ofthings that can be regenerated, is limited. According to the Scientists’ prediction, theprincipal energy in the future will be nuclear energy, solar energy, wind energy,terrestrial heat etc. Recently, more and more attention is focused on wind energy,which is a family member of regenerate energy. For the wind-driven generator, thegrid-connected converter system is the key component that determines the quality ofthe output electrical energy.The object of this paper was to research wind-driven generator grid-connectedconverter. Firstly, the structure of the wind-driven generator and its grid-connectedconverter was introduced, had been proposed, then proposed the control strategy forgrid-connected converter system and pointed out the necessity of applying PEBB(power electronic building block) to design the grid-connected converter system.PEBB can conquer the shortcomings of power electronics design techniques suchas lacking of flexibility, complicated to design etc. For the convenient of thesub-stream modular design of PEBB, the grid-connected converter system wasdivided into four layers: application management layer, grid-connected convertercontrol layer, PEBB control layer and PEBB layer. The application management layerimplemented the global control of the wind-driven generator, ensuring the workingefficiency. Grid-connected converter control layer realized the control strategy forconverter system, guaranteeing the quality of output electrical energy. PEBB controllayer implemented the control of the power electronic devices. PEBB layer was thehardware setting, which included signal condition and sampling, circuit protection etc.To achieve stable communication, choose the CAN bus as the communicationinterface that linking different layers.Due to the intrinsic draw backs such as long development period, complicatedand hard to reuse, a data flow based power electronic control software designmethod was proposed in this paper. Firstly we needed design the global controlsoftware structure for the grid-connected converter, then divided it into sub-models,and realize their function based on ECO (Elementary Control Object), connecting the ECOs in an orderly manner, forming the data flow chart. Finally the control of thegrid-connected converter system can be achieved.