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Large-scale photovoltaic hair to control access to the traditional power grid operation has brought a significant impact, including photovoltaic generation on voltage stability. This article will focus on large-scale photovoltaic power generation access for regional power grid voltage stability in-depth study to explore large-scale photovoltaic access to the regional power grid voltage stability related effects existing. This article first makes a deep analysis on solar farm operation and output characteristics, and constructs different scenes, under which makes a comparative analysis on the PV grid voltage stability. Based on the above analysis of impact, this article further studies the photovoltaic gridconnected inverter electric field and the field side reactive power compensation device to enhance the region's contribution to the stability of the grid voltage. Finally, in no additional reactive power regulation unit case, the realization of large-scale photovoltaic regional power grid voltage stability raised, which has an important reference value for large-scale photovoltaic grid connected areas.

In this paper, for the site selection of the electric substation planning, according to the characteristics of the electric substation load, the k-means clustering algorithm based on density method is presented. Through the analysis of the existing load distribution and electric substation type of its capacity, to determine the clustering center, the radius and density distribution, in combination with GIS data processing function, and in a substation load rate and power supply radius as constraint conditions, the sting of station of electric substation and the supply district are determined, quality of power supply is improved, and the investment and operating cost are reduced. The results of the simulation example demonstrate the superiority and the economy of the algorithm.