Research on Voltage Fluctuations and Over-Limit Suppression of Large-Scale Photovoltaic Access to Distribution Networks
In order to suppress voltage fluctuations and reduce network losses caused by photovoltaic(PV)access to the distribution network,a method for suppressing voltage fluctuations and over-limit in distribution networks with large-scale PV integration is presented in this paper.By analyzing the causes of voltage fluctuations and over-limit when PV is connected to the distribution network,the reactive power and active power of the distribution network load during photovoltaic access are calculated,and the voltage deviation value and the limit value are obtained;and the voltage over-limit suppression method based on the reactive power optimization of a single time section is used to realize the over-limit suppression process of the voltage fluctuation of photovoltaic access to the distribution network.The experimental results show that:this method can effectively reduce the voltage fluctuation range at the branch node positions of the distribution network,keeping the voltage fluctuation values away from the upper and lower limits;and it can effectively reduce the reactive power output by PV devices,reducing the distribution network loss rate from about 15%to about 3%,with significant application effects.
photovoltaic accessdistribution networkvoltage fluctuationout of limit inhibitionobjective function
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