Reactive Voltage Optimization Of Active Distribution Network With Distributed Power And Electric Vehicle With High Permeability

With the development of science and technology,the traditional power grid gradually developing into the smart grid,which promotes the conversion of the traditional single-structure distribution network to the complex active distribution network.The core of the active distribution network is the active word.With large-scale distributed power and electric vehicles and other new energy access to the active distribution network.It is important to make the grid actively control these new energy sources in order to make the voltage of the distribution network operate in a safe and reliable range.It is a practical significance to study the reactive voltage optimization method of active distribution network for distributed power supply and electric vehicle.The specific research contents are as follows:1.Explain the influence of high-permeability distributed power supply and electric vehicle access to the power grid.From different classification types illustrate the characteristics of distributed power supply and the brief structure diagram of the integrated power grid.The calculation method and high permeability calculation range of distributed power supply and electric vehicle is given.Rate.The effects of distributed power supply on the power flow calculation,voltage quality and line loss of the system are analyzed.The influence of different penetration rates on the voltage and line loss is explained by 33 nodes.At the same time,it explains the impact of different output of electric vehicles on system load and network loss.2.Several algorithms for power flow calculation in distribution network are studied,including Newton-type algorithm,bus-type algorithm and branch-type algorithm.The deficiencies of the above methods are analyzed.In order to solve the current power flow calculation in power grid,the thesis uses second-order cone programming.The power flow calculation shows the application of the second-order cone programming in the power flow calculation of the distribution network,and how to deal with the distributed power supply model in the distribution network with distributed power supply using the second-order cone programming.The accuracy of the method is verified by simulation.3.With the continuous development of smart grid,data collection in distribution network is more and more accurate and mature,physical communication technology is becoming more and more mature.The thesis mainly studies the method of voltage situational awareness of active distribution network based on grey correlation analysis method.The situational awareness technology is applied to the active distribution network,and the factors affecting the safe operation of the voltage are collected by the situational awareness technology.The relationship between the factors affecting the safe operation of the voltage is analyzed by the grey correlation analysis method so that the voltage situation and the future voltage trend are made and have a more accurate grasp.The efectiveness and practicability of the method are verified by simulation.4.Considering the collaborative optimization strategy of source network load planning for reactive voltage,a multi-objective function with minimum loss,minimum voltage offset and maximum utilization of electric vehicles is established.In the control strategy,the optimal partition is established for the distribution network.the distributed power supply has a control strategy combined with the static var compensator,the reactive power compensation device is based on a two-stage control strategy,and the electric vehicle is based on the intelligent charge and discharge control strategy studies the source network load access to the active distribution network.The simulation shows that the method has certain practical guidance for the optimization of reactive voltage.