Research And Application Of Distribution Network Electric Energy Quality Problems With Distributed Photovoltaic

In recent years, with the rapid development of modern society and continuous improvement of the electricity market, Users put forward higher requirements with the quality of the power supply system. Nowadays, grid connected photovoltaic technology and the increasing popularity of photovoltaic power generation system, more and more into the distribution network, brings a variety of effects to the operation of distribution network, control etc.First of all, respectively from the analysis of mechanism, photovoltaic grid connected to the distribution network voltage stability of grid connected photovoltaic effect, on the low-voltage side power factor influence, the low voltage distribution network voltage unbalance of the photovoltaic power station, power distribution system the effect of voltage sags on distributed photovoltaic power generation effect.Secondly, combining with the example of distributed photovoltaic power quality problems has conducted the simulation research, including analysis, the fundamental power flow simulation analysis, voltage stability simulation analysis harmonic power flow simulation and different light intensities under different influence on distribution network voltage, in addition, also analyzes the impact of grid connected photovoltaic on voltage distribution network adjustment, and summarizes the methods to solve the effect of grid connected photovoltaic on distribution network voltage. At present, the grid connected photovoltaic inverter with a variety of control modes, including the constant voltage control, constant power factor control and constant reactive power control. So the grid connected photovoltaic inverter in the reactive power regulation range, to support the point voltage, voltage control and network.Again, local trend analysis of photovoltaic power generation and network power, taking the actual photovoltaic generated reactive power as the main basis, according to the most severe PV power fluctuations, the formulation of PV power station reactive power compensation device switching strategy, in order to ensure the operation safety and reliability of photovoltaic.Finally, through the simulation research on the reactive power compensation device switching inrush current, analyzes the main reasons of inrush current, and puts forward effective solutions.