Optimal Power Flow Calculation Method for AC/DC Hybrid Distribution Network Based on Power Router

Abstract

With the continuous development of power electronic technology, the distributed renewable energy generation connected to the distribution network is increasing, and the flexible load such as electric vehicles is also increasing. As a multi-port power electronic equipment, power router (PR) can accept power electronic power supply and load, and be used to build a flexible power distribution system with high power electronic source and load penetration. First, based on VSC power flow calculation steady-state model, this paper proposes a steady-state model of PR; Second, according to the type of bus at both ends of the line and the type of line, the line structure in the AC/DC hybrid power distribution system based on PRs is divided into 8 categories. Power balance equations, supplementary nodes and equations at node i under various structures are analyzed, and based on the classification of the line structure, the node equations of PR nodes and non-PR nodes are analyzed. Finally, the operating constraints of PR and VSC are introduced, with the goal of minimizing the total power generation cost of the system, and the optimal power flow calculation model for the AC-DC hybrid distribution network based on PRs is constructed. Some nodes are replaced with PR of IEEE14 system as a test system for test verification.