Three-phase Power Flow Calculation for Microgrid With Volatile Wind Power, Photovoltaic Power and Load

The traditional power flow calculation model is suitable for microgrid,because the power flow in a microgrid has the characteristics of uncertainty and asymmetry.In order to deal with various stochastic factors in the operation of CHP microgrid,the three-phase power flow calculation model based on Monte Carlo simulation was established.The Benchmark microgrid consisting of a wind turbine,photovoltaic cells,a storage battery,a micro turbine,a fuel cell,heating and electric loads was selected as the research object.The back/forward sweep method was chosen to solve the model.The power fluctuation and voltage quality of microgrid were comparatively analyzed for external network and microsource supporting internal fluctuation of the system respectively.Simulation results show that microgrid can not only improve voltage quality,but also eliminate internal fluctuation in the mode that microsource supports the fluctuation of the system.So the validity of the proposed model and algorithm is proved.