Power Flow Analysis Method and Apparatus for Hybrid AC-DC Systems

摘要

Power flow in a hybrid AC-DC power system is analyzed by determining DC power injection variables as a function of AC state information for common coupling buses which connect AC and DC grids. The AC state information includes voltage magnitude and phase angle information for the common coupling buses and buses in the AC grid(s). The DC power injection variables indicate AC power injection into the one or more AC grids at the common coupling buses from the DC grid(s). The AC state information is revised iteratively as a function of the DC power injection variables and the sensitivity of the DC power injection variables to the AC state information, and the DC power injection variables and the sensitivity of the DC power injection variables are revised iteratively as a function of the revised AC state information until the power mismatch is acceptable.

主权项

1. An exact decomposition method of power flow analysis for a hybrid AC-DC power system having one or more AC grids and one or more DC grids each with two or more terminals connected by common coupling buses, the method comprising:
determining AC state information including voltage magnitude and phase angle information for the common coupling buses and buses in the one or more AC grids; determining DC power injection variables as a function of the AC state information for the common coupling buses, the DC power injection variables indicating AC power injection into the one or more AC grids at the common coupling buses from the one or more DC grids; determining the sensitivity of the DC power injection variables to the AC state information; and iteratively revising (a) the AC state information as a function of the DC power injection variables and the sensitivity of the DC power injection variables to the current AC state information, and (b) the DC power injection variables and the sensitivity of the DC power injection variables as a function of the revised AC state information, until a power mismatch between the DC power injection variables and corresponding AC power injection variables for the common coupling buses is below a predetermined threshold.