Research of power system steady-state model with distributed photovoltaic based on digsilent

At present, the traditional power production mode has been difficult to meet the demand of new situation, it is urgently necessary to adapt new power production mode, distributed generation (DG) technology can improve the reliability of large-scale interconnected power system. However, distributed power supply for the grid is not a controlled source, with the increase of DG, its negative effects on the stability of power system and power quality isn´t ignored. A comprehensive dynamic analysis for micro power grid is needed to conduct. In the thesis the significance of distributed power grid simulation is summed up, the steady-state simulation model of photovoltaic is studied and one micro grid is tested with the commercial simulation software DIGSILENT Power Factory. The test results show that, from the perspective of the steady-state, photovoltaic generating is treated as a PQ node is the most appropriate, when adopt the droop control situation, while increasing the number of droop control of photovoltaic power generation units and reduce the active power of the photovoltaic power generation unit the degree of reactive power over-limited can be reduced.