Optimization Design Of Rucheng County Power Grid Based On Newton-Raphson Method

In recent years, Rucheng County Economic and Social were developed momentum. Modern industry and agriculture were mushroom growth. People's living standards are improving day by day. The demand for electricity is also growing. At the same time, The problem of grid structure weak, low power supply reliability, low qualified rate, insufficient power supply and high power consumption is becoming increasingly prominent. These problems not only greatly limit the economic development of Rucheng County, but also caused a serious waste of resources. To this end, Rucheng power grid must optimize the existing transmission and distribution grid, improve power grid power supply capacity to meet the needs of promoting economic and social development and improve the living standards of the people.In this paper,We mainly study the main power transmission and distribution network of 35kV and 110kV in Rucheng county. Combining theory with practice, to use Newton Raphson algorithm in real power system is studied and discussed. The second and third sections of this thesis are mainly based on the theory research. The second section focuses on the basic mathematical model, the equivalent circuit and the basic parameters of the power flow calculation method. The third section is based from the basic concept of Newton Raphson algorithm. The mathematical model, the physical meaning and the modified equation of the first order and the two order method of Newton Ravson method are discussed in this paper. The theoretical principle and the advantages and disadvantages of the first order method and the two order method for the calculation of the power flow in the power network are analyzed and compared. It can be concluded that Newton's two order method is the main algorithm, and Newton first order method as the auxiliary algorithm, thus ensuring the calculation of the fast and reliable, and meet the requirements of the calculation. It provides a theoretical basis for the following research. The fourth section of this thesis is based on the practical application. The Newton Raphson algorithm is applied to the optimization of power grid transformation in Rucheng county.Rucheng county is a system of smaller size of the county power grid. It is mainly composed of rural and urban network and power supply structure of a single, with hydropower, short transmission line, and did not form a ring network and the reliability is low. Using Newton algorithm to calculate the power flow distribution of Rucheng County in different periods and different conditions. This paper mainly analyzes the problems and hidden troubles in Rucheng county from two indexes of grid voltage and net loss. It puts forward the optimized design scheme of the power network in the next five years, according to the economic development and the load growth of Rucheng power network. The scheme is proposed the optimization of the power system structure and the reactive power optimization of the network, from improving the power supply reliability, improving the grid voltage level and reducing the power loss of the power network. In the optimization of the network structure, the main transformer substation, and the transformation of the old line is put forward, that according to the actual demand of the power network load. In the reactive power optimization of the power network, the voltage and network loss constraint function of the network optimization is proposed. It's analysed and calculated the power flow calculation, afte condition power transformer tap adjustment and no changes in the reactive power compensation device, in the abundant water period, the low water period and the accident inspection, which are proposal to give full play to the Newton Raphson algorithm computational advantages. It's concludes the optimal design plan of net transfom. After optimization, the network structure is more concise, more reasonable, more reliable and more flexible, and the basic form of the network, which covers the entire county, the flexibility, reliability, stability, reliability and stability of power grid operation has been greatly improved. Power grid optimization to achieve the consolidation of local power grid and small hydropower construction results, play with the geographical advantages of the two network, to meet the needs of the electricity market, and promote the development of Rucheng County Industrial and agricultural development of the overall goal.