Linear Power Flow Calculation of Distribution Networks With Distributed Generation

Abstract

To address the shortcomings of the existing linear power flow calculation methods for distribution networks with low versatility and calculation accuracy, a linear power flow calculation method considering distributed generation (DG) is proposed. According to the characteristics of distribution networks and using the Taylor series expansion technology, the nonlinear terms of the basic power flow equation are linearized. The reactive power generated by the non-PV type DG is simplified to a quadratic function of the voltage amplitude. Then, combined with linear approximation and the simplified DG calculation model, the basic power flow equation is simplified into a linear form. Based on the linear power flow equation, a linear power flow calculation method for distribution networks with DG is proposed. The proposed method, which considers various types of DG, has a strong versatility. Finally, the calculation results of typical test systems show that compared with the existing linear power flow calculation methods, the proposed method has a higher calculation accuracy and more versatility and can be used for rapid analysis of distribution networks.