Research On Load Control Strategy For Active Distribution System

The sharp consumption of fossil energy has caused the problem of energy shortage,and the full use of renewable energy has become the focus of the current research.The distributed generation using renewable energy sources is gradually being valued and utilized.The grid-connected generation of distributed generators will undoubtedly bring a series of effects on the operation of the distribution network.And the distribution network containing distributed generators has become an active distribution network.Active distribution network not only makes the new energy grid connected power generation,but also ensures that the power grid quality and quantity of the power supply to the user,in addition to the system can save the cost of equipment upgrades,with good economic benefits.In this paper,the active power distribution system load control strategy for the relevant research,in order to obtain its best performance.First of all,this article details the concept of active distribution network the background and target applications,in-depth analysis of the current development of the status quo at home and abroad and facing obstacles,and according to the difference with the traditional distribution network of comparative analysis,clear the characteristics of active distribution network.And the system structure of the active distribution network is introduced,and the technical system of the active power distribution network is presented.It focuses on the key technologies of active distribution network stable operation control,active distribution network flexible market operation and its integrated planning and design.Secondly,taking the typical control method of grid connected inverters in distributed generation system as an example,this paper analyzes the problems caused by the generation of DG in distribution network.The PQ control strategy,V/F control strategy and Droop control strategy are analyzed in detail.Through the simulation model and simulation analysis of the three control strategies,the operating characteristics of distributed power supply under various control strategies are obtained.Finally,the application situation of various control strategies is finally determined.The requirements of voltage,frequency and other parameters for distributed generation are studied.Finally,the characteristics of interruptible load applied to active distribution network are analyzed in this paper.Taking the actual distribution network as an example,the load control objective function of the active distribution network based on the minimum compensation cost and the least number of interruptions is established.The particle swarm optimization algorithm is used to obtain the load optimal control strategy of the active distribution network.The constraint conditions of objective function taking into account the actual situation of interruptible load,operation characteristics and distributed power under different control strategies,to a certain extent to solve the active distribution network distributed power control and load control contradiction.The load optimal control strategy can make the compensation cost of the active distribution network lower and make the load interruption at least.System management technologies and solutions in this paper,which can not only ensure the reliability of power supply,but also can strengthen the power supply and the relationship between technology innovation and construction for the power grid,and the introduction of power to provide certain theoretical guidance.