The Analysis About Access Capacity Of Distribute Photovoltaic Power Generation Under Un-coordinated Control

In order to obtain the access capacity constraints of distributed photovoltaic power generation under un-coordinated control conditions. In this thesis, the mathematical models of voltage deviation and voltage fluctuation caused by various distribution of loads and photovoltaic power generations are established. There are three constraints included in the models:(a) the maximum upper voltage deviation caused by accessing distributed photovoltaic power generations,(b) the maximum voltage fluctuation caused by accessing distributed photovoltaic power generations, and(c) the maximum lower voltage deviation caused by the loads, when no photovoltaic power generation accessed.This thesis attempts to analyze the voltage deviation and fluctuation under thirty-six settings consist of six typical load distribution patterns and six typical distributed photovoltaic power generation distribution patterns. There are three stages involved in the research processes. First, the extremum about the six settings included parallel load distribution and photovoltaic power generation distribution is evaluated. In this stage, the constraints about access capacity of distributed photovoltaic power generation are developed. Second, the five settings of that the loads concentrate in the end of the feeder while the photovoltaic power does not follow are not discussed in this stage, because those situations rarely exist in practice.Third, the range of access capacity of distributed photovoltaic power generation in the other twenty-five settings is determined. Due to inequality is utilized in the process of simplification in this stage, the calculating results would be stricter than the practical ones.The 10 k V distribution networks of rural and urban areas with typical parameters are used as the example for calculating the access capacity of distributed photovoltaic power generation. Besides of this, the instruction and analysis about the methodology is able to prove that the method of this thesis could provide the range of access capacity of distributed photovoltaic power generation accurately. The voltage deviation and fluctuation in the feeders of distribution networks could be acceptable, as long as the capacity of accessed distributedphotovoltaic power does not exceed the range of the ones in corresponding settings. Finally,the conclusion of this thesis could provide scientific support for distributed photovoltaic power generation accessing to the grid and distribution network planning.