A Method For Power Supply Radius Calculation Of Distribution Systems With Distributed Generation

The purpose of this research is to seek detailed calculation method for power distribution network radius, the method can be solved by different supply regions and select the best mode power supply radius at different voltage levels, rational distribution and the distribution network plays an important role in guiding the economy.The main content of this paper is the first calculation method by studying the traditional supply radius, summarized the relationship between the expression of specific radius and the parameters of power between the grid and on the basis of line load, voltage quality and line loss rate on the increase of distribution consider the reliability of the power supply network, come increased supply will directly increase the radius of the line loss rate is reduced and the load voltage quality and supply reliability followed by the establishment of economic mathematical model of the distribution network, including the construction of the substation and line maintenance operation and loss costs, which subdivided into capacity-related and has nothing to do with the wire cross-section relevant and irrelevant items, the objective function and constraints to determine the best economic analysis of different operating mode power supply radius, the increase in the distribution network on the basis of traditional integration distributed power to consider the establishment of wind power and photovoltaic power generation and economic costs mathematical model to study the major share of the specific impact of access capacity load ratio of cases under different local distribution network for distributed power supply radius of the economy, and with access before to compare and analyze the specific distributed power improvement. Finally, we discuss the basis of economic power on the method for calculating the radius of the optimal radius distribution network, mainly to take multi-objective optimization approach to supply radius comprehensive optimization, and achieved better calculations.For solving the economic problems and the optimal radius radius, where the use of improved simulated annealing particle swarm optimization and multi-objective particle swarm optimization algorithm, established a unit cost and power lines in the area of economic radius of the lowest-cost optimization goal to solve the economic radius, combined with the smallest unit of power from voltage loss as a multi-objective optimization problem solving optimal power supply radius. Random initialization particle swarm optimization variables need to specify the value range of problem solving to bring some convenience and good initial value will greatly reduce the number of iterations and computation time, accurate results fast convergence in the problem solving got an ideal application effect.To support the theory, the paper did a lot of numerical examples, mainly due to the radial distribution system network mainly for solving power supply radius also need to be progressively graded solving theoretical distribution network power quality requirements of the higher meet the conditions of supply shorter radii, but the corresponding economic costs will be higher, this intermediate voltage level35kV network as example, the typical network model for different load levels, different conductor cross-section, respectively, different constraints and standards economic power supply radius under a detailed calculation, analyzed the economic power of the radius parameter changes with each characteristic, and finally the rated load is calculated considering the various factors to select the optimum economic radius run mode. The distributed computing power is calculated based on the traditional distribution network expanded, the same as the specific analysis. For the calculation of the optimal power supply radius is relatively simple, only calculated and analyzed the normal mode, but it still has some practical significance.Radius determines the layout of the power grid structure, but also play a key role in the substation site, with the continuous development of increasingly complex structural layout grid transmission corridor more and more scarce, so the method proposed by the radius of the reasonable selection of power rational distribution optimized distribution network not only has a certain practical significance in improving the grid layout and reduce economic costs, improve application has to a certain value on power quality.