Research On Cooperative Optimal Allocation Of Distributed Generation And Reactive Power Compensation Device

The burning of traditional fossil fuels brings many environmental problems.In order to realize the concept of sustainable development,people have proposed distributed generation technology.Distributed generation technology can widely develop and use renewable energy and improve energy efficiency.With the continuous improvement of China’s communication,control technology and equipment manufacturing capabilities,the application of distributed generation is becoming more and more widespread,and the installed capacity is continuously increasing.Grid-connected distributed generation affects the network structure and power flow distribution of the distribution network.Reasonably configuring the access location and capacity of the distributed generation can reduce the active loss of the line,raise the voltage of the system nodes,improve the power quality at the end of the distribution network and relieve the use of electric force.Therefore,it is of practical significance to optimize the allocation of distributed generation.Firstly,this paper introduces the system structure and operating characteristics of photovoltaic power generation and wind power generation,analyzes its mechanism through mathematical modeling.The effect of distributed generation grid connection on the voltage deviation,voltage fluctuation,voltage distribution and active power loss of the distribution network is explored.Then,based on PSCAD / EMTDC simulation software,this paper simulates and builds a 10 k V distribution network model,a photovoltaic power supply model,and a double-fed asynchronous fan model.Through parameter setting,simulate photovoltaic grid connection and wind power grid connection under different working conditions.Through the simulation analysis,it shows that the reasonable allocation of distributed generation capacity and access location can play a supporting role in the distribution network,improve the power quality of the distribution network,and provide theoretical support for the optimal allocation of distributed generation in the following paper.Finally,this paper puts forward a coordinated optimization allocation strategy of DG and reactive power compensation device.With the constraints of system power flow,node voltage,access DG capacity,and reactive power compensation device capacity as constraints,the optimal allocation model of distribution network including distributed generation and reactive power compensation device is established.The improved adaptive genetic algorithm is adopted,and the weighting sum of distribution network loss and voltage deviation is used as the objective function to optimize the allocation.This paper introduces the implementation process of genetic algorithm from chromosome coding,population initialization,fitness function,genetic operation,and gives the algorithm flow chart.The crossover operation and mutation operation use an improved adaptive crossover operator and mutation operator,and the elimination mechanism and the optimal preservation strategy are introduced to enhance the ability of global search and avoid the phenomenon of "premature".Taking the improved IEEE33 node system as an example for analysis,it can be concluded that the algorithm in this paper can effectively optimize the allocation of DG and reactive power compensation devices,make the network loss and voltage deviation of the distribution network significantly lower after the DG is connected to the grid,improve the voltage stability of the system,reduce the active power loss of the system and improve the power quality of the system.