Research On Reactive Power Allocation And Dynamic Optimization Of Transformer Substation Based On Improved Genetic Algorithm

Under the background of the policy of revitalizing the old industrial bases in Northeast China,the economy in Northeast China has developed rapidly.With the increase of reactive power load and the use of a large number of non-linear and impulsive loads,the lack of reactive power regulation means makes bus voltage vary greatly with operation mode.The optimization calculation of reactive power and the optimization design of static var compensator are becoming more and more important.At the same time,the traditional reactive power optimization problem is the reactive power optimization under a specific load.In the actual operation of power system,static reactive power optimization for a data section can not fully meet the actual operation needs because of the changing load.Dynamic reactive power optimization takes into account the dynamic load changes at each node of the system and the constraints on the number of operations of control equipment.By reasonably allocating the action time of the control equipment,the goal of overall optimization can be achieved.In this paper,reactive power allocation,design and dynamic optimization of substation are studied.The main work is as follows:(1)Through the analysis and research of power flow calculation method and interpolation algorithm,a reactive power optimization numerical algorithm based on power flow calculation is adopted.The optimal distribution of reactive power compensation capacity is calculated.The effect of various SVC equipments on power quality control is analyzed and studied.Aiming at the reactive load of substation,the principle of selecting the configuration form of SVC and the calculation method of corresponding capacity are put forward.The harmonic characteristics of TCR and the working principle and related characteristics of passive filter are analyzed and studied.According to the results of comparison between harmonic current generated by TCR and power quality requirements,the filter number and structure are designed and calculated.(2)According to the principle of SVC configuration form selection,capacity calculation method and filter design method proposed.Through the analysis and calculation of the actual power grid and typical substations,Verify the rationality and scientificity of the algorithm.(3)The application of genetic algorithm in reactive power optimization of power system.Aiming at the shortcomings and shortcomings of standard genetic algorithm,the idea of niche isolation genetic algorithm is systematically analyzed.The isolation niche technology has been successfully applied to reactive power optimization of power system.At the same time,aiming at the difficulties of dynamic reactive power optimization,a time-division strategy based on automatic load segmentation is adopted to solve the restriction of equipment action times.Static reactive power optimization is carried out in 24 segments to obtain the change value of discrete control variables.Combining the variation of discrete control variables with the constraints of the number of actions of the control equipment,the operation time of the control variables is allocated.According to the pre-operation table,the correlation of the control equipment in actual operation is analyzed,and the action time of the control equipment is readjusted to achieve the dynamic control of reactive power and voltage.