Optimal Power Flow Calculation of Active Distribution Network Based on Improved Comprehensive Technology

Abstract

Comprehensive unified power flow controller ( UPFC ) technology can calculate voltage control parameters of UPFC, but it increases the nonlinearity of Newton power flow calculation. When the comprehensive technology is combined with the intelligent algorithm, the control parameters can only be optimized through the active and reactive power of UPFC on the branch, which makes the optimization convergence worse. Therefore, an optimal power flow calculation method for active distribution network based on improved comprehensive technology is proposed. First, based on the analysis of the influence of UPFC on branch power flow, an improved UPFC model is proposed. The accuracy of UPFC control parameters is enhanced by adjusting the voltage phase angle and regulation radius of series side transformer. Second, the optimal control model considering UPFC is established. Finally, the corresponding self-admittance and mutual admittance elements are extracted from the constructed UPFC model and introduced into the Jacobian matrix, so that while the comprehensive technology maintains the dimension of the Jacobian matrix, the intelligent algorithm can directly optimize the control parameters to reduce the search space. The IEEE33 bus system is used for example simulation, the results before and after the improvement are compared, and the Monte Carlo method is used to calculate the two algorithms 50 times respectively based on the installation number of UPFC, which verifies that the proposed optimization method has better convergence and operation speed.