Reactive Power And Voltage Control Based On Improved Differential Evolution Algorithm

With the rapid development of the national economy, the power quality requirements of all sectors continuously increased. Power system reactive power and voltage control is a complex nonlinear optimization problem. The efficient and rational allocation of reactive power has a great significance for power system security and economy.First of all, this paper introduced the research content and status quo of power system reactive power and voltage control and various optimization algorithms applying in power system reactive power and voltage control. At an overview of their advantages and disadvantages, the paper sets up a mathematical model on the basis of regarding the active power losses to a minimum as the objective function. The paper presents the matrix mathematical form of the model so as to overcome the programming difficult of the traditional model.Based on the fact that the initial population having a significant impact on the convergence merit of the algorithm, this paper calculates the system power flow first, and divides the system into some types. Then suitable initial population is presented in this paper in accordance with calculated results.Differential evolution algorithm is a new optimization algorithm which has the advantages of good convergence and excellent operating efficiency. This paper uses differential evolution algorithm to study the problem. At the same time, this paper proposes improvements for the traditional differential evolution algorithm, and the enhanced operator are introduced in the algorithm which improving the optimizing capacity of the algorithm. IEEE-14 and IEEE-30 bus system are used to testify the algorithm, and the results shows that the improved algorithm has better convergence characteristics and higher speed of computation. Finally, in view of the limitation of current reactive power investment, this paper analyses the mathematical model of reactive power and voltage control problem with fixed investment. Simulation shows that the reactive power compensation equipments are installed at the nodes where active power losses drop more quickly, so as to obtain greater economic benefits.