Distribution Network Planning And Optimized Operation With Distributed Power Generation

With the rapid growth of my country's industrial economy,the demand for electricity is getting higher and higher,and my country's traditional power generation is mainly based on thermal power.In the process of thermal power generation,it will not only cause a large amount of coal resource consumption,but also cause damage to the environment.Serious pollution.Relying only on traditional centralized power generation has been difficult to meet the current needs,and in the daily operation of distributed power sources,not only clean and pollution-free,but also installation boundaries,flexible forms,in recent years.It has been rapidly promoted and developed,but with the large number of distributed power sources connected to the grid,it will affect the power flow,network loss and voltage of the regional distribution network,and increase the difficulty of planning the regional power grid.To this end,this article will take the investment benefits of distributed photovoltaic power sources into the distribution network as a starting point,comprehensively consider factors such as economic and environmental benefits,and design a method that conforms to the regional grid grid planning.In the process of the thesis research,first introduce the principle and basic structure of distributed photovoltaic power generation system,and analyze the impact of distributed power generation on the voltage,power flow,relay protection and planning of the regional distribution network after grid connection On this basis,an optimization algorithm for photovoltaic grid-connected location selection and capacity is proposed.The corresponding grid-connected node is selected by calculating the sensitivity of the node,and the construction and maintenance costs,environmental benefits and other factors are comprehensively considered to design the corresponding constant capacity model.Secondly,in view of the problem that the maximum load is used in the load calculation in the selection of the constant capacity model,the accuracy is reduced,the relationship between the load and the output characteristics of the photovoltaic power supply is analyzed in detail,and the simultaneous rate of the load and the photovoltaic power supply is used as the standard to calculate the low capacity The effective value of distributed power output under the following conditions is revised,and the site selection and capacity model is revised to establish an objective function with three factors of construction and maintenance costs,environmental benefits and network loss benefits,and voltage fluctuations and power flow prohibition reverse are the constraints.Construct a new optimization model.In the process of calculating and solving,the traditional particle swarm algorithm is easy to fall into the local optimal situation,and the leapfrogalgorithm is used to improve it,and then the global optimal solution is obtained.Finally,the characteristics of photovoltaic output and load in Hanzhong area are analyzed in detail,and some areas are taken as examples to verify whether the algorithm proposed in this paper can achieve the goals of regional power grid planning.