Distributed Power Flow Calculation Considering Limiting Constraints of Photovoltaic Inverters

Abstract

In networked microgrids, each microgrid is usually managed by an independent operator, and it is difficult to adapt to the actual situation of data privacy protection and distributed management among microgrids by using the global power flow method, so distributed power flow should be used for analysis. Existing distributed power flow algorithms rarely solve the problem of non-smooth limits of distributed photovoltaic, and the non-smooth constraints such as limits will cause the microgrid power flow to not converge. This paper proposes a distributed power flow calculation method considering limiting constraints of photovoltaic inverters. Firstly, the non-smooth limits models for DG are established based on complementary constraints, and smoothed by Fischer-Burmeister (FB) function; then, according to the requirements of distributed management, the networked microgrids is partialized, and the boundary coordination equation of coordination side is established in the form of implicit function, which is solved by the Jacobian-Free Newton-GMRES (JFNG) algorithm, avoiding the explicit Jacobian matrix. Finally, an example is used to verify the accuracy of the proposed distributed algorithm and the effectiveness of the non-smooth characteristic processing method.