Research On The Reactive Power Optimization Of Oil-field 220kV Power Grid Based On Trust-tech Algorithm

With the rapid development of our national economy,the demand for electricity is increasing,and the requirement of power quality is becoming higher and higher.Power quality is the key to guarantee people's normal life order.A large number of reactive power in the power system is consumed in power distribution network and the users.Because reactive power can't transmit over long distances,so the reactive power compensation of distribution network is very important to ensure the quality of user's voltage.Reactive power compensation also attracts people's more and more attention.Reactive power is the main cause of voltage instability,and voltage collapse are usually caused by the lack of reactive power.When the system reactive power is less than the demands,the transmission of reactive power in power grid will reduce the voltage level,and make the line voltage drop increase,thereby causing voltage loss.Therefore,to improve the power factor of power grid is of important theoretical significance and practical significance in improving the economic operation and power qualityOn the basis of the existing distribution network reactive power optimization algorithm,this dissertation comprehensively considered the regional power grid load in oilfields,the existing reactive power compensation capacity and the cost of reactive power compensation device,and then established reactive power compensation optimization model with grid tide as constraint.A new regional power grid reactive power optimization algorithm is put forward with the combination of Trust-Tech algorithm and primal dual interior point method.The reactive power optimization process is realized through the Matlab programming,and determines the fixed compensation capacity and the dynamic compensation capacity in all levels of substations.Based on the reactive power optimization results of IEEE-33 nodes system and Shengli oilfield Xingu substation power grid,the advantages and disadvantages of the new algorithm and traditional algorithm are analyzed.The simulation results suggest that compared with the traditional algorithm,the new algorithm has faster computing speed and global convergence.Camparing the network data before and after the optimization,the reactive power optimization results based on the proposed new algorithm show that the optimized network voltage quality has improved,the network loss is decreased obviously.At the end of the dissertation,according to the operation of the oil fields,the regional power grid reactive power optimization control program is designed.This program will promote reactive power optimization to the whole area,and will realize the real-time reactive power optimization compensation for power grid.It will improve the voltage quality and reduce the network losses,and provide the basis of the optimization of reactive power regulation for oil field power grid operation personnel.This program will help to realize the rational flow of regional power grid reactive power and better implementation of economic and stable operation of power grid.