A non-incremental model for optimal control of reactive power flow

Based on the decoupled principle, a non-incremental quadratic programming model for optimal control of reactive power flow in power systems is presented in this paper. In the model, the reactive powers through all lines are regarded as the unknown variables to be evaluated, as well as the transformer tap positions, generator terminal voltages and switchable injected reactive powers; and a characteristic linear approximation of power flow is formulated. Because of the characteristics of the non-incremental variables of the model, execution time and memory requirements and convergence properties are satisfactory; thus, it is particularly fit to improve voltage magnitudes and to minimize system losses under operating conditions. Real power economic dispatch is accomplished by standard techniques. Numerical results show the practicality of the model.